The measurement of various aspects of MAGNETIC FIELDS.
Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)
A trace element that constitutes about 27.6% of the earth's crust in the form of SILICON DIOXIDE. It does not occur free in nature. Silicon has the atomic symbol Si, atomic number 14, and atomic weight [28.084; 28.086].
Areas of attractive or repulsive force surrounding MAGNETS.
Fields representing the joint interplay of electric and magnetic forces.
A class of devices combining electrical and mechanical components that have at least one of the dimensions in the micrometer range (between 1 micron and 1 millimeter). They include sensors, actuators, microducts, and micropumps.
The study of MAGNETIC PHENOMENA.
Family in the order COLUMBIFORMES, comprised of pigeons or doves. They are BIRDS with short legs, stout bodies, small heads, and slender bills. Some sources call the smaller species doves and the larger pigeons, but the names are interchangeable.
Planet that is the third in order from the sun. It is one of the four inner or terrestrial planets of the SOLAR SYSTEM.
Warm-blooded VERTEBRATES possessing FEATHERS and belonging to the class Aves.
Instinctual patterns of activity related to a specific area including ability of certain animals to return to a given place when displaced from it, often over great distances using navigational clues such as those used in migration (ANIMAL MIGRATION).
High-energy radiation or particles from extraterrestrial space that strike the earth, its atmosphere, or spacecraft and may create secondary radiation as a result of collisions with the atmosphere or spacecraft.
The distinctly human attributes and attainments of a particular society.
Celestial bodies orbiting around the sun or other stars.
Ionized gases, consisting of free electrons and ionized atoms or molecules which collectively behave differently than gas, solid, or liquid. Plasma gases are used in biomedical fields in surface modification; biological decontamination; dentistry (e.g., PLASMA ARC DENTAL CURING LIGHTS); and in other treatments (e.g., ARGON PLASMA COAGULATION).
The measurement of magnetic fields generated by electric currents from the heart. The measurement of these fields provides information which is complementary to that provided by ELECTROCARDIOGRAPHY.
The regular recurrence, in cycles of about 24 hours, of biological processes or activities, such as sensitivity to drugs and stimuli, hormone secretion, sleeping, and feeding.
Characteristics, properties, and effects of magnetic substances and magnetic fields.
A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.
The magnetic stimulation of specific target tissues or areas of the body for therapeutic purposes via the application of magnetic fields generated by MAGNETS or ELECTROMAGNETS.
An arrangement of wires distributing electricity.
Waves of oscillating electric and MAGNETIC FIELDS which move at right angles to each other and outward from the source.
Learning algorithms which are a set of related supervised computer learning methods that analyze data and recognize patterns, and used for classification and regression analysis.
An increase in the rate of speed.
A continuing periodic change in displacement with respect to a fixed reference. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
A tough, malleable, iron-based alloy containing up to, but no more than, two percent carbon and often other metals. It is used in medicine and dentistry in implants and instrumentation.
Stainless steel. A steel containing Ni, Cr, or both. It does not tarnish on exposure and is used in corrosive environments. (Grant & Hack's Chemical Dictionary, 5th ed)
A quality of cell membranes which permits the passage of solvents and solutes into and out of cells.

Mortality from Alzheimer's, motor neuron and Parkinson's disease in relation to magnetic field exposure: findings from the study of UK electricity generation and transmission workers, 1973-2004. (1/261)

BACKGROUND: There are a number of reports linking magnetic field exposure to increased risks of Alzheimer's disease and motor neuron disease. METHODS: The mortality experienced by a cohort of 83 997 employees of the former Central Electricity Generating Board of England and Wales was investigated for the period 1973-2004. All employees were employed for at least six months with some employment in the period 1973-82. Computerised work histories were available for 79 972 study subjects for the period 1971-93. Information on job and facility (location) were used to estimate exposures to magnetic fields. Two analytical approaches were used to evaluate risks, indirect standardisation (n = 83 997) and Poisson regression (n = 79 972). RESULTS: Based on serial mortality rates for England and Wales, deaths from Alzheimer's disease and motor neuron disease were unexceptional. There was an excess of deaths from Parkinson's disease of borderline significance. No statistically significant trends were shown for risks of any of these diseases to increase with lifetime cumulative exposure to magnetic fields (RR per 10 muT-y: Alzheimer's disease 1.10 (95% CI 0.90 to 1.33); motor neuron disease 1.06 (95% CI 0.86 to 1.32); Parkinson's disease 0.88 (95% CI 0.74 to 1.05)) CONCLUSIONS: There is no convincing evidence that UK electricity generation and transmission workers have suffered increased risks from neurodegenerative diseases as a consequence of exposure to magnetic fields.  (+info)

On the free energy that drove primordial anabolism. (2/261)

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Electromagnetic biostimulation of living cultures for biotechnology, biofuel and bioenergy applications. (3/261)

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Enhancing the utility of complex-valued functional magnetic resonance imaging detection of neurobiological processes through postacquisition estimation and correction of dynamic B(0) errors and motion. (4/261)

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A novel background field removal method for MRI using projection onto dipole fields (PDF). (5/261)

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Weak static and extremely low frequency magnetic fields affect in vitro pollen germination. (6/261)

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How Nemo finds home: the neuroecology of dispersal and of population connectivity in larvae of marine fishes. (7/261)

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Magnetization transfer using inversion recovery during off-resonance irradiation. (8/261)

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TY - JOUR. T1 - Static magnetic fields affect calcium fluxes and inhibit stress-induced apoptosis in human glioblastoma cells. AU - Teodori, Laura. AU - Göhde, Wolfgang. AU - Valente, Maria Giovanna. AU - Tagliaferri, Fausto. AU - Coletti, Dario. AU - Perniconi, Barbara. AU - Bergamaschi, Antonio. AU - Cerella, Claudia. AU - Ghibelli, Lina. PY - 2002/12/1. Y1 - 2002/12/1. N2 - Background: Epidemiologic data revealed increased brain tumor incidence in workers exposed to magnetic fields (MFs), raising concerns about the possible link between MF exposure and cancer. However, MFs seem to be neither mutagenic nor tumorigenic. The mechanism of their tumorigenic effect has not been elucidated. Methods: To evaluate the interference of MFs with physical (heat shock, HS) and chemical (etoposide, VP16) induced apoptoses, respectively, we exposed a human glioblastoma primary culture to 6 mT static MF. We investigated cytosolic Ca2+ ([Ca2+]i) fluxes and extent of apoptosis as key endpoints. The effect of ...
Using a custom build spectrophotometer equipped with Helmholtz coils and designed to study the effects of magnetic fields on enzyme reactions in real-time we have investigated the influence of fields, from 100 ?T to 10 mT and at a variety of field frequencies, on the membrane bound enzymes alkaline phosphatase and acetylcholinesterase. We have also employed other methods to apply a magnetic field, e.g. Biostim. In contrast to earlier reports we have been unable to detect any field effects on these enzymes under any field/frequency regime. We discuss possible reasons for the discrepancy between this and earlier work and note the particularly complex influence of small temperature changes that may confound analysis.. ...
Especially during interventions realised in open magnetic resonance scanners the medical stuff is exposed to strong static magnetic fields. It is necessary to ensure that the performance of the medical stuff is not impaired due to exposure and does not pose a risk for the patients. This topic was investigated in the project Effects of Exposure to Strong Static Magnetic Fields on the Cognitive Performance of Volunteers. Several subjects reported predominantly at seven Tesla and during movement in magnetic field gradients vertigo, nystagmus, magnetophosphenes and head ringing. Nevertheless, the annoying perceptions did not have any influence on the cognitive performance of volunteers. Most of them got quickly accustomed to the exposure and the symptoms disappeared. The magnetic field had no influence on stress hormone level in saliva and blood. ...
An apparatus comprises a radio frequency magnetic field unit to generate a desired magnetic field. In one embodiment, the radio frequency magnetic field unit includes a first aperture that is substantially unobstructed and a second aperture contiguous to the first aperture. In an alternative embodiment, the radio frequency magnetic field unit includes a first side aperture, a second side aperture and one or more end apertures. In one embodiment of a method, a current element is removed from a radio frequency magnetic field unit to form a magnetic field unit having an aperture. In an alternative embodiment, two current elements located opposite from one another in a radio frequency magnetic field unit are removed to form a magnetic filed unit having a first side aperture and a second side aperture.
Objectives-To evaluate the impact of extremely low frequency ELF magnetic fields on markers of human fertility. Methods-A follow up study of time to pregnancy, semen quality, and reproductive hormones was conducted among couples planning first pregnancies 36 males were welders and 21 were non-welders. The male and the female partner were...
TY - JOUR. T1 - Static magnetic field attenuates mortality rate of mice by increasing the production of IL-1 receptor antagonist. AU - Lin, Shu Li. AU - Chang, Wei Jen. AU - Lin, Yung Sheng. AU - Ou, Keng Liang. AU - Lin, Che Tong. AU - Lin, Chih Ping. AU - Huang, Haw Ming. PY - 2009/7. Y1 - 2009/7. N2 - Purposes: Disseminated intravascular coagulation (DIC) is a complex systemic thrombohemorrhagic disorder involving intravascular coagulation and hemorrhage. The aim of this study is to test whether static magnetic field (SMF) is effective in attenuating lipopolysaccharide (LPS)-induced DIC. Materials and methods: In vivo experiments were performed in this study using male BALB/cByJ mice. An intraperitoneal injection of 50 mg/kg LPS was shown to lead to approximately 50% mortality and this dose was used in subsequent experiments. To test the effects of SMF on the survival rate of LPS-induced animals, the mice were exposed to 0.25-T SMF for 2h before LPS injection. In addition, the effect of a 2-h ...
TY - JOUR. T1 - A Static Magnetic Field Reduces lipopolysaccharide-induced Proinflammatory Cytokine Levels of Fibroblasts by Altering Membrane Fluidity. AU - Lin, Che-Tong. AU - Chen, Chi-An. AU - Chen, Yu-Fu. AU - Chen, Chun-Yang. AU - Lee, Sheng-Yang. AU - Huang, Haw-Ming. PY - 2007. Y1 - 2007. N2 - Lipopolysaccharide (LPS) is one of the major substances that initiate an immune host response in microbial infections which results in cytotoxicity. In terms of the treatment of the immune response, much research on endotoxin tolerance that can reduce LPS-induced damages has been conducted. In this experiment, cultured fibroblasts were challenged with LPS in order to initiate an inflammatory reaction. Cell numbers and various proinflammatory cytokine levels were compared between a static magnetic field (SMF)-exposed group and an unexposed group. Our results showed that with LPS challenge, fibroblasts exposed to a 4000-G SMF demonstrated a higher cell density (8.28±0.14 10^4 cells/ml) when compared ...
Have you ever seen a bar magnet? Bar magnets have two magnetic poles - north and south. The magnetic field around a bar magnet is called a dipole magnetic field. Dipole means two poles. Bar magnets are not the only things that make dipole fields. Electricity flowing through a coiled wire can cause a dipole magnetic field. The magnetic fields of some planets are pretty much dipole fields.. Dipoles are not the only shape magnetic fields come in. There are also quadrupole fields with four poles. Sometimes magnetic fields have six or even eight poles (an octupole!). Any field with more than two poles is called a multipole field.. Some planets, stars, and moons have magnetic fields. Some of those magnetic fields are pretty much dipoles. Others are more complex. They have a mix of dipole and multipole magnetic fields. The magnetic fields of Earth and Jupiter are mostly dipoles. They only have weak multipole parts. Uranus and Neptune have more complicated magnetic fields. The quadrupole parts of ...
The azimuthal angular dependence of the vectorial hysteresis loops in the Fe50Mn50(AF)/Ni81Fe19(F) bilayer grown under a magnetic field was investigated using a combination of vectorial magneto-optic Kerr effect and model calculation. From a comparison of the experimental and calculation results, it is found that the AF easy axis is not parallel with but rotated by about 20° away from the applied magnetic field during the sample growth. Moreover, the transverse loop at the AF easy axis does not vanish but displays an open full circle (i.e., magnetization changes sign between decreasing and increasing field branches for the full hysteresis measurement). Our model calculation reveals that they are reminiscent of the non-collinear uniaxial and unidirectional anisotropies. Specifically, the angular dependence of the transverse hysteresis is well reproduced with our model calculation taking non-collinear magnetic anisotropies into account. Coercivity determined from the longitudinal loops, on the ...
In this large-scale international pooling effort, we found no clear evidence for an association between parental occupational ELF-MF exposure and ALL or AML in their offspring. This was consistent for the pooling approach and the meta-analytical approach of combining studies and confirmed in various sensitivity analyses.. A small increased risk of leukaemia in relation to paternal ELF-MF exposure in the meta-analysis of 11 CLIC plus four other published studies must have been due to the added studies especially from the UK and Russia, because this association was not observed for the CLIC pooled studies. With the addition of those studies, exposure assessment was no longer harmonised. Moreover, funnel plot and Eggers test suggested the presence of publication bias. It appears to confirm what was previously suggested by Hug et al,22 namely that publication bias is a concern, confirming the need of studying this exposure in an unbiased dataset with regard to the original hypothesis, as discussed ...
We have theoretically studied the combination effects of the electric and magnetic fields on the binding energy of an on-center donor impurity in disc-shaped GaAs/Al0.3Ga0.7As quantum dots (QDs) with emphasis on the competition effects between the two fields under externally applied pressure and temperature. The electric field is applied along the radial direction of the QD, while the magnetic field is applied along the growth direction. The numerical method we employed in the present calculations is the potential morphing method in the framework of the effective mass approximation. Our results show that the two fields exhibit a competition effect on the donor binding energy, leading to an invariant binding energy as in the zero field case at a critical line. This line separates the region corresponding to the red shift of the donor binding energy from the one referring to the blue shift of the binding energy. Comparing to the magnetic field effect, increasing in the QD sizes or applied ...
Effects of dc and low-frequency ac magnetic fields on the motion and distribution of counterions on surfaces of cylindrical biological cells are examined. Magnetic fields along the cell axis as well...
سلامت کار ایران Iran Occupational Health (IOH) seeks to publish Original Research Papers and Case Reports, Review Articles and Technical Reports related to the fields of Public Health and Occupational Health particularly. IOH is an official publication of Iran University of Medical Sciences, Faculty of Public Health and is published quarterly. The following guidelines refer to the Journal requirements for receiving your manuscripts for possible publication. Complying with guidelines will expedite the process of evaluation and publication of the submitted manuscripts. IOH regrets to reject those contributions that deviate from the Journal style.
Nanotechnology plays an increasingly important role in the biomedical arena. In particular, magnetic nanoparticles (mNPs) have become important tools in molecular diagnostics, in vivo imaging and improved treatment of disease, with the ultimate aim of producing a more theranostic approach. Due to their small sizes, the nanoparticles can cross most of the biological barriers such as the blood vessels and the blood brain barrier, thus providing ubiquitous access to most tissues. In all biomedical applications maximum nanoparticle uptake into cells is required. Two promising methods employed to this end include functionalization of mNPs with cell-penetrating peptides to promote efficient translocation of cargo into the cell and the use of external magnetic fields for enhanced delivery. This study aimed to compare the effect of both penetratin and a static magnetic field with regards to the cellular uptake of 200 nm magnetic NPs and determine the route of uptake by both methods. Results demonstrated that
Nanotechnology plays an increasingly important role in the biomedical arena. In particular, magnetic nanoparticles (mNPs) have become important tools in molecular diagnostics, in vivo imaging and improved treatment of disease, with the ultimate aim of producing a more theranostic approach. Due to their small sizes, the nanoparticles can cross most of the biological barriers such as the blood vessels and the blood brain barrier, thus providing ubiquitous access to most tissues. In all biomedical applications maximum nanoparticle uptake into cells is required. Two promising methods employed to this end include functionalization of mNPs with cell-penetrating peptides to promote efficient translocation of cargo into the cell and the use of external magnetic fields for enhanced delivery. This study aimed to compare the effect of both penetratin and a static magnetic field with regards to the cellular uptake of 200 nm magnetic NPs and determine the route of uptake by both methods. Results demonstrated that
It is indeed possible to focus magnetic fields, however maybe not quite in the sense that youre thinking. Im not quite sure what level to target my explanation, so please bear with me if Im being a bit too verbose. Depending upon how you start, it can quickly become a confusing subject. There are two important extreme cases: that of static magnetic fields (well, largely static) and those that are dynamic. Magnetostatics is relatively straight forward. Depending upon the geometry of the source, you can increase the strength of the magnetic field in particular places. For instance, at the center of a coil as youve already said, or from the corners of a magnetic body. In these places the magnetic field can be much stronger than in other locations. In addition, the magnetic fields produced by relatively ordinary magnets can in fact be very large when you measure near enough to them. Things always seem to get more complicated when you add time. So to have a magnetic field that becomes extremely ...
The biological effects of static magnetic fields (MFs) with intensity of 6 mT were investigated in lymphocytes and U937 cells in the presence or absence of apoptosis-inducing drugs by transmission (TEM) and scanning (SEM) electron microscopy. Lectin cytochemistry of ConA-FITC conjugates was used to analyze plasma membrane structural modifications. Static MFs modified cell shape, plasma membrane and increased the level of intracellular [Ca++] which plays an antiapoptotic role in both cell types. Modifications induced by the exposure to static MFs were irrespective of the presence or absence of apoptotic drugs or the cell type. Abundant lamellar-shaped microvilli were observed upon 24 hrs of continuous exposure to static MFs in contrast to the normally rough surface of U937 cells having numerous short microvilli. Conversely, lymphocytes lost their round shape and became irregularly elongated; lamellar shaped microvilli were found when cells were simultaneosly exposed to static MFs and ...
A permanent magnet in which the magnetization direction varies with location to optimize or restrict a magnetic field property in a selected direction at a selected point. The magnetic field property may be, for example, the transverse magnetic field, axial magnetic field, axial gradient of the transverse magnetic field, transverse gradient of the transverse magnetic field, axis gradient of the axial magnetic field, transverse gradient of the axial magnetic field, the product of the transverse magnetic field and the transverse gradient of the transverse magnetic field, the product of the transverse magnetic field and the axial gradient of the transverse magnetic field, the product of the axial magnetic field and the transverse gradient of the axial magnetic field, or the product of the axial magnetic field and the axial gradient of the axial magnetic field. The magnet may be formed of one or more segments in which the magnetization direction varies smoothly and continuously, or the magnet may be formed
The early-type chemically peculiar stars often show strong magnetic fields on their surfaces. These magnetic topologies are organized on large scales and are believed to be close to an oblique dipole for most of the stars. In a striking exception to this general trend, the helium-strong star HD 37776 shows an extraordinary double-wave rotational modulation of the longitudinal magnetic field measurements, indicating a topologically complex and, possibly, record-strong magnetic field. Here we present a new investigation of the magnetic field structure of HD 37776, using both simple geometrical interpretation of the longitudinal field curve and detailed modeling of the time-resolved circular polarization line profiles with the help of a magnetic Doppler imaging technique. We derive a model of the magnetic field structure of HD 37776, which reconciles for the first time all magnetic observations available for this star. We find that the local surface field strength does not exceed approximate to 30 ...
The summation method allows the calculation of both the magnetization and the static magnetic field of a setup of conductive and ferromagnetic materials. T
TY - JOUR. T1 - Effect of a magnetic field on the rheological properties of iron oxide-water-glycerol system. AU - Vshivkov, Sergey A.. AU - Rusinova, Elena V.. AU - Galyas, Andrei G.. PY - 2016/2/1. Y1 - 2016/2/1. KW - Magnetic liquid. KW - Nanodispersed system. KW - Viscosity. KW - Magnetic field. KW - SUSPENSIONS. KW - VISCOSITY. KW - MAGNETOVISCOSITY. KW - FERROFLUIDS. KW - FLUIDS. UR - http://www.scopus.com/inward/record.url?scp=84958759970&partnerID=8YFLogxK. UR - https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=tsmetrics&SrcApp=tsm_test&DestApp=WOS_CPL&DestLinkType=FullRecord&KeyUT=000369316200006. U2 - 10.1007/s00397-016-0909-8. DO - 10.1007/s00397-016-0909-8. M3 - Article. VL - 55. SP - 155. EP - 161. JO - Rheologica Acta. JF - Rheologica Acta. SN - 0035-4511. IS - 2. ER - ...
The biologically based hypothesis that magnetic fields increase the risk of conditions related to cardiac arrhythmia and acute myocardial infarction but not chronic cardiovascular disease was initially supported by the results of an epidemiologic study. High rates of cardiovascular disease and relatively common exposure to magnetic fields made it an important public health question. Most of the epidemiologic studies that followed showed no effect. In this paper the basis for both this hypothesis and the epidemiologic studies that tested it are presented. It was concluded that the evidence speaks against an etiologic relation between exposure to electric and magnetic fields and cardiovascular disease. This effort represents an interesting case study of a scientific inquiry that has been successfully resolved despite numerous methodological difficulties inherent in research on low-level environmental exposures.. ...
The objective of this paper is to provide the fundamental mathematical formula to predict the effect of magnetic fields (MF) on stem cell differentiation. The data were reviewed from journals related to the effects of magnetic fields on stem cell differentiation. These data were given a value for differentiation which is related to their MF strength with these conditions; MF strength that does not affect the stem cell differentiation given the value of zero, MF strength that results in stem cells death given the value of 1, and the MF strength that affects stem cells The differentiation given the value between 0.1 and 0.9. graph was plotted according to these data and the mathematical equation is designed from the graph. From this review, we suggest that the intensity of MF that can affect the stem cell differentiation is between 600μT and 9.4T in which the cell differentiation will not occur with intensity of less than 10μT and intensity of more than 12T will cause the death of stem cells. We ...
Effect of static magnetic field (SMF) on plants is a matter of debate. In the present study plausible useful effects of SMF on wheat plant (Triticum aestivum L.) via improvement of antioxidant system and iron/ferritin fortification were evaluated. The plants were cultivated in pots and in their reproductive stages were treated with or without a 30 mT SMF for 4 days, each 5h. The activity of antioxidant system, iron and ferritin contents was evaluated. In comparison with the control groups, SMF treatment significantly increased the contents of iron, ferritin, and Fe-bound proteins in edible parts of the plants. Treatment with SMF also significantly increased catalase activity and radical scavenging capacity of wheat seeds which led in turn to decrease of membrane lipid peroxidation. The results provide us with a new approach for application of physical stimulators such as SMF in order for iron biofortification and increase of antioxidant capacity of critical crops.
The effect of a static magnetic field (MF) of 0.5 mT of intensity on the cell proliferation/cell death balance was investigated in renal cells (VERO) and cortical astrocyte cultures from rats. Magnetic stimulation was delivered by magnetic disks at known intensities. The percentage of apoptotic and …
Finger skin blood perfusion during exposure of ulnar and median nerves to the static magnetic field of a rare-earth magnet: A randomized pilot study. temp. ...
Read Effects of Weak Environmental Magnetic Fields on the Spontaneous Bioelectrical Activity of Snail Neurons, The Journal of Membrane Biology on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
The paper presents the impact of magnetic fields on enzyme activities in plants. Three species of wheat with different ploidy levels were used in the experiments: Triticum monococum (diploid), T. dicocum (tetraploid), and T. aestivum (hexaploid). Air-dry seed samples, made up of 100 seeds each,...
Call it another victory for German design. Researchers in Dresden have set a new world record for the strongest magnetic field ever manufactured at the High Magnetic Field Laboratory Dresden (HZDR). Using a two-layer, 440-pound copper coil the size of a water bucket, they managed to coax 91.4 teslas from their creation for just a few milliseconds, surpassing the previous record of 89 teslas.. Thats a lot of teslas. Your standard high-power copper coil would be torn apart at something like 25 teslas, the researchers say. Thats because the magnetic field and the electric current that creates it work at cross purposes at higher energies. The current running through the coil generates the magnetic field, but the magnetic field pushes back against the electrons flowing through the coil. The stronger the current, the more the magnetic field pushes back, and once the current crosses a certain threshold the magnet will quite literally tear itself apart.. But we need bigger, badder magnets. The higher ...
Magnetism is a class of physical phenomena that includes forces exerted by magnets on other magnets. It has its origin in electric currents and the fundamental magnetic moments of elementary particles. These give rise to a magnetic field. A magnetic field is a region of space near a magnet, electric current, or moving charged particle in which a magnetic force acts on any other magnet, electric current, or moving charged particle. All materials are influenced to some extent by a magnetic field. Large objects, such as the earth, other planets, and stars, also produce magnetic fields. - Stock Image C022/1932
There is great interest in the development of novel therapies for acute ischemic stroke because, to date, the thrombolysis is the only approved treatment. Recent evidence suggests that extremely low frequency magnetic fields (ELF-MF) could be an alternative approach for acute ischemic stroke therapy because of their effects on the main mechanisms of brain ischemic damage and regeneration.The main purpose of this open label, one arm, dose escalation study is the validation of ELF-MF stimulation as non-invasive, safe and effective tool to promote recovery in acute ischemic stroke patients Nine patients will be treated daily for 5 consecutive days, starting within 48 h from the onset of stroke. Three dose cohorts of three patients each, will be stimulated with pulsed ELF-MF (75 Hz, 1,8 mT) at increasing daily exposure (45, 120, 240 min).The primary outcome (safety endpoint) will be evaluated by the incidence of adverse events and mortality throughout the stimulation period and the 1-year follow-up. ...
Earths magnetic field, computer artwork. The blue lines represent the magnetic field lines, which extend from the magnetic poles near the North and South poles. The magnetic field, which is thought to be generated by the movement of molten iron in the Earths core, protects Earth from high-energy radiation from the Sun. The shape of the magnetic field channels charged particles from the Sun towards the poles, where they impact atmospheric gases and cause the aurorae. - Stock Image C001/3785
A general theory of radio propagation by wave-guide modes is given, which simultaneously makes allowance for the gradualness of the lowest part of the ionosphere, the earths curvature and the earths magnetic field. The method involves solving differential equations satisfied by the matrix admittance or matrix reflexion coefficient variables. The mode condition, excitation factor, and polarization of the waves in a mode are derived by evaluating the residues of a series of poles of a contour integral. The earths curvature is allowed for by the method of the modified refractive index, thus avoiding the use of cumbersome spherical wave functions. This also permits the replacement of a point source by a line source with consequent further simplification of the mathematics. Formulae are given which have been used for computations described elsewhere (Budden & Martin 1962; Martin 1961). ...
The research area of Cosmic Magnetic Fields is dedicated to the exploration of solar, stellar, and galactic magnetic fields, along with the underlying magnetohydrodynamic (MHD) mechanisms that generate them. Magnetic fields drive the non-thermal output of many cosmic objects, in particular that of the Sun and other stars. It is the agent responsible for spectral atmospheric activity that in turn governs star-planet interactions. The existence of stellar and planetary magnetic fields is a decisive factor for the formation and evolution of life on planets, as magnetic fields are shields against high-energy cosmic radiation. Their existence also ensures the further evolution and survival of civilisations like ours. Yet the magnetic field is still among the least-studied unknowns of the universe. The science focus of the Branch-I is summarized here. The overview of the sections and staff members can be seen here.. ...
Recent studies suggest that the Earths magnetic field has fallen dramatically in magnitude and changed direction repeatedly since the last reversal 700 kyr ago (Langereis et al. 1997; Lund et al. 1998). These important results paint a rather different picture of the long-term behaviour of the field from the conventional one of a steady dipole reversing at random intervals: instead, the field appears to spend up to 20 per cent of its time in a weak, non-dipole state (Lund et al. 1998). One of us (Gubbins 1999) has suggested that this is evidence of a rapid natural timescale (500 yr) in the outer core, and that the magnetic field is usually prevented from reversing completely by the longer diffusion time of the inner core (2 to 5 kyr). This raises a number of important but difficult questions for geodynamo theory. How can the geomagnetic field change so rapidly and dramatically? Can slight variations of the geomagnetic field affect the dynamics of core convection significantly? If so, is the ...
On the basis of spectrograms, obtained with the echellette spectrograph of the tower solar telescope of the Crimean astrophysical observatory, the absolute values of the magnetic field strength H are determined from different absorption lines. It is found, that the magnetic field strength changes from one line to another and depends both on the Rowland intensity and on the excitation potential of the lower level of the line. There is a dependence between H and mean optical depths mean tau of lines. The field is very inhomogenous with depth and H increases, in the main, with the increase of mean tau. But in a separate case, there were both positive and negative gradients of the field into the depth of a spot. It has been determined that in the period from September 2 up to September 5, 1961 in the spot-leader of group No. 251 the coming up to the surface of the magnetic field took place, and during September 5-7, - the expansion of the field, mainly. (Author)(*SOLAR SPECTRUM
The present work was undertaken in order to investigate the effects of magnetic field (MF) on hematopoiesis and fuel metabolites in female rats. At thermoneutrality (25 C), the exposition of rats 1 hour/day for 10 consecutive days to a MF of 128 mT (m Tesla) induced an increase in hematocrit and hemoglobin compared to controls. Exposure to MF also induced an increase in blood glucose levels but had no effect on triglyceride concentrations. Moreover, serum alanine aminotransferase activity remained unchanged in treated rats, while aspartate aminotransferase and lactate dehydrogenase activities increased by about 22% and 33%, respectively, following MF exposure. It was concluded that sub-acute exposure to MF induced elevations in hematocrit, hemoglobin, plasma fuel metabolites and tissue enzymes release within the blood. Key words: Magnetic field, hematology, glucose, triglycerides, plasma enzymes, rat.. Keywords: Magnetic field, glucose, triglycerides, plasma ...
Magnetic Field Mapping System MMS-1X-RS allows a user to create high resolution map of the magnetic field around an electromagnet or permanent magnet. The map of the magnetic field may be given in the form of color coded 2D or 3D isometric visual display on PC screen, tables of the numerical values of the three components, the total magnetic field, and so on. Due to the unique features of the applied integrated Hall probe, all three components of the magnetic field are measured simultaneously at virtually the same point. The system is controlled by an extremely easy-to use-software built on MS Windows platform ...
The performance of hard-magnetic nanostructures is investigated by analyzing the size and geometry dependence of thin-film hysteresis loops. Compared to bulk magnets, weight and volume are much less important, but we find that the energy product remains the main figure of merit down to very small features sizes. However, hysteresis loops are much easier to control on small length scales, as epitomized by Fe-Co-Pt thin films with magnetizations of up to 1.78 T and coercivities of up to 2.52 T. Our numerical and analytical calculations show that the feature size and geometry have a big effect on the hysteresis loop. Layered soft regions, especially if they have a free surface, are more harmful to coercivity and energy product than spherical inclusions. In hard-soft nanocomposites, an additional complication is provided by the physical properties of the hard phases. For a given soft phase, the performance of a hard-soft composite is determined by the parameter (Ms - Mh)/Kh.
Researchers at the Universitat Autònoma de Barcelona (UAB) have obtained a formula for building a Antimagnet. that can nullify the magnetic field, a discovery that was published in the New Journal of Physics.. UAB researchers publish in New Journal of Physics a formula to create a device capable of blocking any type of magnetic field. The antimagnet will make it possible for people with pacemakers to undergo magnetic resonances and to control the magnetic fields of technological devices.. Researchers worked to obtain a formula which will cover three objectives. First, an objects magnetic field will not penetrate the exterior once it is covered by the antimagnet. Second, everything cloaked by the antimagnet will be protected from external magnetic fields and the object inside will be undetectable. Third, all materials used to create the antimagnet must be available, i.e. the antimagnet must be manufactured with the use of existing technology.. The formula UAB researchers have devised is ...
Experiments conducted in the MCL allowed us to assess the impact of changes in specific parameters of cardiac function, such as the preload and the contractility, on the pump head-motor current hysteresis loop. The data presented demonstrate that the shape of the hysteresis loop changes with preload and contractility in a way that can distinguish the type of change occurring. For example, the effect of varying LVEDP versus change in contractility (dP/dt) can be distinguished by comparing the preload variation case with the isolated contractility change case. Furthermore, LVEDP can be readily extracted from the hysteresis loop morphology because it appears as an inflection point when the pump changes from encountering a left ventricle undergoing diastolic filling with one that is actively contracting. The inflection point was observed in both the MCL and animal experiments, and shown in the MCL to be independent of varying contractility state.. Validation was performed using physiologically ...
Last time we calculated the energy of the electric field. Now lets repeat with the magnetic field, and lets try to be a little more careful about it since magnetic fields can be slippery. Lets consider a static magnetic field $latex B$ generated by a collection of circuits $latex C_i$, each carrying a current $latex…
L. Verschaeve, A. Maes & R. Anthonissen. The possible carcinogenic effects of extremely low frequency magnetic fields (ELF-MF) are still a matter of debate and controversy. As carcinogenesis is most often related to genetic effects (mutation) it is considered of great importance to conduct studies on ELF-induced genetic effects. For the current period (2001-2005), the team investigations were mainly devoted to: (1) the comet assay in brain and blood cells of mice exposed to ELF-magnetic fields and; (2) effects of co-exposure to 50 Hz magnetic fields with an aneugen (e.g. a chemical that increases the number of cells with an abnormal chromosome count).. We did not find important genetic damage following relatively high exposure levels, but some subtle changes were found however. These changes involved DNA damage as well as changes in gene-expression profiles and cell proliferation.. Overall, our observations were not sufficient to allow any conclusion in favor of ELF-induced negative health ...
0053] FIG. 17 shows an exemplary coil for providing a secondary polarization field in another embodiment of the present disclosure. Exemplary permanent magnet 1702 induces a primary magnetic field in the fluid flowing in tubular 1710. A current flowing through secondary coil 1704 induces a secondary magnetic field in the tubular. The induced secondary magnetic field may be superimposed with the primary magnetic field of the permanent magnets to either increase or reduce the total magnetic field in the fluid flowing in the tubular. In one embodiment, the induced secondary magnetic field is selected to increase the total magnetic field in the fluid to enable nuclear magnetic resonance testing at selected field strengths, or to increase a signal to noise ratio of signals responsive to an excitation pulse. In another embodiment, the induced magnetic field is selected to reduce the total magnetic field to substantially cancel the primary magnetic field within the fluid in the tubular. While a ...
Issues associated with the exposure of patients to strong, static magnetic fields during magnetic resonance imaging (MRI) are reviewed and discussed. The history of human exposure to magnetic fields is reviewed, and the contradictory nature of the literature regarding effects on human health is described. In the absence of ferromagnetic foreign bodies, there is no replicated scientific study showing a health hazard associated with magnetic field exposure and no evidence for hazards associated with cumulative exposure to these fields. The very high degree of patient safety in strong magnetic fields is attributed to the small value of the magnetic susceptibility of human tissues and to the lack of ferromagnetic components in these tissues.. ...
No health risks have been demonstrated for static electric fields occurring in usual exposure situations that arise from direct current power lines. The static magnetic fields arising from direct current power lines are also harmless in usual exposure situations. The amendment to the 26th BImSchV made in August 2013 sets legal requirements for direct current plants in Germany. The limit value of 500 microtesla (0.5 millitesla) was selected so as to rule out interference effects on cardiac pacemakers from static magnetic fields.. In the medical sector, strong static magnetic fields of several tesla (i.e. several thousand millitesla) are used for imaging processes. In this sector, acute effects such as dizziness and nausea can occur both in patients and also in medical staff. By the way, the effects of low frequency fields differ greatly from those of high frequency fields. The latter are found for example around mobile communications ...
Traditional CIEDs are currently referred to as non-MR imaging-conditional devices, given the advent of newer, MR imaging-conditional devices. The presence of a non-MR imaging-conditional CIED was conventionally thought to be a contraindication for undergoing MR imaging.14⇓-16 As will be discussed shortly, this is no longer the case. Multiple risks have been associated with these nonconditional devices, primarily related to interactions between the ferromagnetic components of these devices and the static magnetic field, gradient magnetic fields, and the transmitted radiofrequency (RF) field.17. The static magnetic field can affect a CIED in multiple ways. For instance, the field can reset/reprogram the device or deplete its battery.4,18⇓-20 It can also affect the magnetically activated reed switch within the device, spontaneously switching the CIED into an asynchronous pacing mode.21,22 The potential for some of these scenarios to occur can be limited by switching the device into asynchronous ...
This MSc diploma thesis in Space Engineering at Luleå University of Technology, was carried out at Monash University in Melbourne, Australia. It is within the area of solar physics with focus on the magnetic field of the Sun. Within solar physics, the process generating the magnetic field of the Sun is normally referred to as the solar dynamo. An important tool when it comes to understanding the magnetic field of the Sun and its interactions with the whole solar system, is to construct solar dynamo models. The aim is to obtain a model, which produces output corresponding to the solar observations and which preferably also could be used to predict the solar magnetic activity. A solar flux transport dynamo model code, which was to be used for the project, was provided by Dr. M. Dikpati. It simulates the magnetic field of the Sun for a half-sphere solution and the output can be compared to solar observations. The initial focus of the project was set on varying a specific magnetic field parameter ...
Measurement of a precessional rate of a gas, such as an alkali gas, in a magnetic field is made by promoting a non-uniform precession of the gas in which substantially no net magnetic field affects the gas during a majority of the precession cycle. This allows sensitive gases that would be subject to spin-exchange collision de-phasing to be effectively used for extremely sensitive measurements in the presence of an environmental magnetic field such as the Earths magnetic field. ...
Several studies have shown that low frequency electromagnetic field has biological and therapeutic potential on the human body, however, to very limited extent on the heart. In the current study cardiac patients suffering from exercise-induced-angina will undergo two consecutive stress tests, one test after being exposed for 30 minutes to the magnetic field and the other test after being exposed to placebo (magnetic field not operated). The order of which the magnet will be operated will be randomly assigned for the patients so a group of patients will be exposed to the magnetic field at their first stress test and another groups of patients will be exposed to the magnetic field at their second stress test. During resting period, and while the patients are subjected to the magnetic field, a 12 lead electrocardiogram (ECG) will be monitored. Thereafter the magnetic field and frequency will be turned off and the patients will be subjected to graded exercise stress test during which they will be ...
Email: [email protected] Earths Magnetic Field Is Produced By An External Dynamo System, Not An Internal Dynamo.. Researcher finds that Earths magnetic field is not produced by an internal dynamo. Nor is it produced by ocean current. The dynamo is outside the Planet! New findings by independent researcher, Dennis Brooks, show that Earths magnetic field and the planet itself are components of a complex dynamo system, which surrounds the planet. The planet and its magnetic field are part of the dynamo.. According to this new theory, no internal dynamo or ocean current helps in producing or maintaining the magnetic field because other planets with magnetic fields do not have ocean currents or iron cores.. Image by NASA. Each planet does not have a unique way of producing its magnetic field. The magnetic field of each planet is produced by a planetary dynamo system and its ring current.. For many years researchers thought that a similar dynamo system was within the planet and that this ...
Background. The effect of the magnetic field on fish egg shells has not attracted major interest of researchers, even though it could have been predicted that such effect may be vital to fish embryogenesis. One of the hitherto-neglected aspects of the magnetic field action of fish eggs are the changes in the egg shell permeability and possible alteration of the process of embryogenesis. Studying this process and learning the associated phenomena may be important in explaining cases of substantial mortality of the embryos. Materials and Methods. Fish eggs (Atlantic salmon, Salmo salar L.; sea trout, Salmo trutta L.; and rainbow trout, Oncorhynchus mykiss (Walbaum, 1792) and isolated egg shells, in a custom-made osmometer setups, were subjected to the action of a stable magnetic field (2 mT). The ultrastructure of the egg-shells was studied using a scanning electron microscope (JEOL JSM 6100). Results. Stable magnetic field (2 mT), affecting fish eggs, caused statistically significant increase in ...
He YL et al. (2013): Exposure to Extremely Low-Frequency Electromagnetic Fields Modulates Na(+) Currents in Rat Cerebellar Granule Cells through Increase of AA/PGE(2) and EP Receptor-Mediated cAMP/PKA Pathway ...
More about pulsating magnetic field therapy:. The therapeutic use of magnetic fields is probably the oldest form of physical therapy. In antiquity one already recognised and used the biological effect of magnetic fields. The writings of famous physicians such as Hippocrates, Hildegard of Bingen and Paracelsus confirm the use of magnetic fields for therapeutic purposes.. The earths magnetic field covers our planet from north to south. Positive and negative poles, activity and passivity, stimulation and calming- these polarities of all lifes processes have their origins in the magnetic poles of north and south. The magnetic fields energy regulates all living processes on earth. The magnetic resistance of the bodys cells and the flowing of vital energies within the body, depend on magnetic fields. May assist:. ...
The aim of the present study was to assess whether exposure to the combination of an extremely low frequency magnetic field (ELF-MF; 60 Hz, 1 mT or 2 mT) with a stress factor, such as ionizing radiation (IR) or H2O2, results in genomic instability in non-tumorigenic human lung epithelial L132 cells. To this end, the percentages of G2/M-arrested cells and aneuploid cells were examined. Exposure to 0.5 Gy IR or 0.05 mM H2O2 for 9 h resulted in the highest levels of aneuploidy; however, no cells were observed in the subG1 phase, which indicated the absence of apoptotic cell death. Exposure to an ELF-MF alone (1 mT or 2 mT) did not affect the percentages of G2/M-arrested cells, aneuploid cells, or the populations of cells in the subG1 phase. Moreover, when cells were exposed to a 1 mT or 2 mT ELF-MF in combination with IR (0.5 Gy) or H2O2 (0.05 mM), the ELF-MF did not further increase the percentages of G2/M-arrested cells or aneuploid cells. These results suggest that ELF-MFs alone do not induce ...
The present invention enables stereotactic surgery with a minimal structure present in order to facilitate surgery yet with enhanced accuracy in stereotactic imaging assistance to the surgeon. This device and method is known as frameless stereotaxis system, and uses coordinate referencing between the CT or MRI scans and a stereotactic referencing system which uses an electromagnetically driven system to determine the location of a stylus. Magnetic field distortion is reduced through the use of a low frequency magnetic field. The frame of reference through which this system operates is coordinate referenced to the coordinates of a composite image formed from a CT, MRI, or other system which are arranged and may be generated in two- or three-dimensional fashion in response to the position of a pointer (25) as they are referenced to the orientation of a patient (31) during an operation. In the present device and method, registration of the scan images illustrating the lesion (33) with the physical
The present invention enables stereotactic surgery with a minimal structure present in order to facilitate surgery yet with enhanced accuracy in stereotactic imaging assistance to the surgeon. This device and method is known as frameless stereotaxis system, and uses coordinate referencing between the CT or MRI scans and a stereotactic referencing system which uses an electromagnetically driven system to determine the location of a stylus. Magnetic field distortion is reduced through the use of a low frequency magnetic field. The frame of reference through which this system operates is coordinate referenced to the coordinates of a composite image formed from a CT, MRI, or other system which are arranged and may be generated in two- or three-dimensional fashion in response to the position of a pointer (25) as they are referenced to the orientation of a patient (31) during an operation. In the present device and method, registration of the scan images illustrating the lesion (33) with the physical
  The present study aims at solving the problem of stagnant water due to receiving of sewage water in a lake at Eastern Jeddah, using state of the art safe techniques. Samples were collected from the lake, then treated using magnetic fields with different intensities in two states, static and shaking, for 30 days. Hence, the physical and chemical properties for samples were measured, in addition to their bacterial content. In both cases of static and shaking, increasing the magnetic flux density caused water clearness, in addition to a relative increase in the pH value and a remarkable decrease in its odor and electric conductivity (EC). In addition, it was observed that lead ions and bacterial content decreased. The study shows that the increasing magnetic field intensity to the level used in this study, accompanied by shacking, is supplemented with the findings of the experiment. It also suggests that the magnetic field plays a major role in finding successful solutions for a lot
Cellular permanent magnet resonance imaging (MRI) has been well-established for tracking sensory progenitor cells (NPC). displayed untouched viability, oxidative tension, differentiation and apoptosis. In the showed mobile MRI test, the hypointensities symbolizing the SPION labeled NPCs remained observable throughout the entire tracking period. The findings indicate that simple SPION incubation without the addition of TAs is definitely an efficient intracellular permanent magnet marking method. This simple approach may become regarded as as an alternate approach to the mainstream marking method that entails the use of TAs. Intro Cellular permanent magnet resonance imaging (MRI) offers been well-established as a useful approach for tracking neural progenitor cells (NPC) transplanted for restorative purposes [1]C[3]. Permanent magnet cell labeling, which entails incorporating permanent magnet substances into the intracellular space of cells, is definitely an essential step for this technique ...
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This thesis describes several novel in-vivo proton magnetic resonance spectroscopy (MRS) techniques used to study the human brain. By measuring brain metabolites non-invasively, MRS has provided seminal contributions to our fundamental understanding of the brain as well as a wide variety of clinical conditions. However, due to the relative insensitivity and low spectral resolution of MRS, many important brain metabolites cannot be accurately quantified under standard clinical conditions. One way of in- creasing both the sensitivity and spectral resolution of MRS is to increase the static magnetic field strength. Unfortunately, increasing the static magnetic field strength also creates new technical challenges that must be resolved before any gains associated with higher magnetic field strength can be achieved. Due to increased shimming requirements and hardware limitations, many MRS experiments at higher magnetic fields are performed on a single voxel in the brain - thereby limiting any possible ...
The response of magnetic nanoparticles (MNPs) to an oscillating magnetic field outside the linear response region is important for several applications including magnetic hyperthermia, magnetic resonance imaging and biodetection. The size and magnetic moment are two critical parameters for the performance of a colloidal MNP dispersion. We present and demonstrate the use of optomagnetic (OM) and AC susceptibility (ACS) measurements vs. frequency and magnetic field strength to obtain the size and magnetic moment distributions including the correlation between the distributions. The correlation between the size and the magnetic moment contains information on the morphology and intrinsic structure of the particle. In OM measurements, the variation of the second harmonic light transmission through a dispersion of MNPs is measured in response to an oscillating magnetic field. We solve the Fokker-Planck equations for MNPs with a permanent magnetic moment, and develop analytical approximations to the ACS and
A kind of magnetic field sensor composed of magnetic fluid surrounding a segment of singlemode fiber is proposed. The taper-like and lateral-offset fusion splicing techniques are employed. The sensing principle is based on cladding mode interference. The interference valley wavelength or transmission loss of the sensing structure is sensitive to the external magnetic field, which is utilized for magnetic field sensing. The linear response regions are obtained in the range of 38-225 Oe and 250-475 Oe. For the valley-wavelength-shift-type sensing, the sensitivities are 14.1 pm/Oe and 26 pm/Oe at low and high field ranges, respectively. For the transmission-loss-variation-type sensing, the sensitivity of −0.024 dB/Oe is achieved for the magnetic field strength ranging from 250 to 475 Oe.. © 2014 Optical Society of America. Full Article , PDF Article ...
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As part of a major faculty hiring initiative, the Department of Chemistry at the University of Florida (http://www.chem.ufl.edu ) seeks a full-time, nine-month, tenure-track appointment at the level of ASSISTANT PROFESSOR, in the general area of magnetic resonance, broadly defined, to begin August 16, 2018. The successful applicant will join over 40 Faculty in the Department, which is home to the Quantum Theory Project and the Butler Polymer Research Center. The Department has recently opened the Joseph Hernandez Hall, a state-of-the-art teaching and research facility. Numerous opportunities exist for collaboration across the UF campus and the National High Magnetic Field Laboratory (NHMFL; https://nationalmaglab.org/ ) and the Advanced Magnetic Resonance Imaging and Spectroscopy (AMRIS) Facility. The new faculty member will be expected to develop a successful research program that utilizes or develops magnetic resonance methodology, preferably with applications at high magnetic fields. UF and ...
We propose a strategy to measure weak static magnetic fields with nitrogen-vacancy color center in diamond. Inspired by avian magnetoreception models, we consider the feasibility of utilizing quantum coherence phenomena to measure weak static magnetic fields. Nitrogen-vacancy (NV) color centers are regarded as the ideal platform to study quantum sciences as a result of its long coherence time up to a millisecond timescale. In high-purity diamond, hyperfine interaction with 13C nuclear spins dominates the decoherence process. In this paper, we numerically simulate the decoherence process between 0 and +1 of the individual NV color center spin in 13C nuclear baths with various of magnitudes of external magnetic fields. By applying Hahn echo into the system, we obtain the coherence of NV color center spin as a function of total evolution time and magnetic field. Furthermore we obtain the high-accuracy relationship between the three decoherence-characteristic timescales, i.e. T_W, T_R, T_2, and ...
Because of the serological cross-reactivity among the flaviviruses, molecular detection methods, such as reverse-transcription polymerase chain reaction (RT-PCR), play an important role in the recent Zika outbreak. However, due to the limited sensitivity, the detection window of RT-PCR for Zika viremia is only about one week after symptom onset. By combining loop-mediated isothermal amplification (LAMP) and AC susceptometry, we demonstrate a rapid and homogeneous detection system for the Zika virus oligonucleotide. Streptavidin-magnetic nanoparticles (streptavidin-MNPs) are premixed with LAMP reagents including the analyte and biotinylated primers, and their hydrodynamic volumes are dramatically increased after a successful LAMP reaction. Analyzed by a portable AC susceptometer, the changes of the hydrodynamic volume are probed as Brownian relaxation frequency shifts, which can be used to quantify the Zika virus oligonucleotide. The proposed detection system can recognize 1 aM synthetic Zika ...
Effect of static magnetic field on germination of mung beans is described. Seeds of mung beans, were exposed in batches to static magnetic fields of 87 to 226 mT intensity for 100 min. Magnetic time constant - 60.743 Th (Tesla hour) was determined experimentally. High value of magnetic time...
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Magnetic Matrices Used In High Gradient Magnetic Jan 01, 2017nbsp018332high magnetic field gradient is a crucial factor in hgms process which can be described as a separation process or a deep-bed filtration process in which a magnetic matrix is magnetized and used to bundle the external magnetic field in its vicinity to generate high magnetic field gradient .in the presence of strong magnetic field, paramagnetic and ferromagnetic particles can be strongly .... ...
With the completion of a new, 35-tesla magnet, the highest-field resistive magnet in the world is located at the Tallahassee facility. The state-of-the-art magnet, which incorporates Florida-Bitter technology invented at the lab, was designed and built on-site and is immediately available for research.. The 35-tesla magnet is an upgrade of an existing 30-tesla magnet and surpasses the previous record of 33 tesla, also held by the laboratory. Tesla is a measurement of the strength of a magnetic field; 1 tesla is equal to 20,000 times the Earths magnetic field. Typical magnetic resonance imaging (MRI) machines in hospitals provide fields in the range of 1 to 3 tesla. Put another way, the increase from 30 to 35 teslas in the new magnet represents a 17-percent jump, or an increase equal to the magnetic force of two MRI machines.. With the advances that magnet lab engineers and technicians have made in magnet technology, it would be easy to become nonchalant about the significance of these ...
When scientists recently began noticing a decline in the magnetic field - about 10 percent over the past two centuries - it led to speculation that another polarity flip would happen soon. But the magnetic fields intensity could simply be coming down from an unusual high rather than approaching a reversal, new research suggests. Thats because the magnetic fields intensity rises and falls without a clear pattern, only sometimes dipping far enough to become unstable and possibly reverse. During a reversal, geomagnetic intensity declines during a transition period that typically lasts hundreds to thousands of years, then rebuilds. ...
Introduction Increase in alpha band is observed when blood perfusion in frontal area of head decreases. The present study evaluated some changes in the alpha band particularly, alpha-1 of frontal and central areas of the head, when several areas were exposed simultaneously to magnetic field. Materials and Methods Five points of head (F3, F4, Cz, T3, and T4) of twenty healthy male participants were exposed to magnetic fields simultaneously by five separate coils at different frequencies of 45, 17, 10, 5, and 3 Hz, in five separate sessions. The magnetic field intensity was 100 µT at 1.5 cm distance from the coil. At the end, relative powers over these areas in common frequency and alpha-1 bands were evaluated by paired t-test. Results Significant reduction (p|0.05) in alpha-1 band was observed by exposure of local ELF magnetic field at frequencies of higher than 5 Hz in closed-eye. These reductive effects were enormous at 5 and 45 Hz frequency. Conclusion Observed reduction in alpha-1 band may be due to
The problem of the diffraction of normally incident longitudinal waves on a Griffith crack located in an infinite soft ferromagnetic elastic solid is considered. It is assumed that the solid is a homogeneous and isotropic one and is permeated by a uniform magnetostatic field normal to the crack surfaces. Fourier transforms are used to reduce the problem to two simultaneous dual integral equations. The solution to the integral equations is expressed in terms of a Fredholm integral equation of the second kind having the kernel that is a finite integral. The dynamic singular stress field near the crack tip is obtained and the influence of the magnetic field on the dynamic stress intensity factor is shown graphically in detail. Approximate analytical expressions valid at low frequencies are also obtained and the range of validity of these expressions is examined.. ...
A rotor for an inner-rotor modulated pole machine, the rotor being configured to generate a rotor magnetic field for interaction with a stator magnetic field of a stator of the modulated pole machine, wherein said rotor is adapted to rotate around a longitudinal axis of the rotor; wherein the rotor comprises a plurality of permanent magnets arranged circumferentially around the longitudinal axis, each permanent magnet being magnetised in a direction of magnetisation so as to generate a magnetic flux; a plurality of axial flux guiding members each adapted to provide an at least two-dimensional flux path for the magnetic flux generated by a respective one of the plurality of permanent magnets; a support structure comprising an inner tubular support member arranged radially inward of the plurality of permanent magnets; and at least one outer flux guiding member adapted to provide a path in at least a radial direction for the magnetic flux generated by one or more of the plurality of permanent magnets
Electromagnetic noise is emitted everywhere humans use electronic devices. For decades, it has been hotly debated whether man-made electric and magnetic fields affect biological processes, including human health. So far, no putative effect of anthropogenic electromagnetic noise at intensities below …
For spin 1/2 nuclei, the energy difference between the two spin states at a given magnetic field strength are proportional to their magnetic moments. However, even if all protons have the same magnetic moments, they do not give resonant signals at the same field/frequency values. This is because this dependent on the electrons surrounding the proton in covalent compounds. Upon application of an external magnetic field, these electrons move in response to the field and generate local magnetic fields that oppose the much stronger applied field. This local field thus shields the proton from the applied magnetic field, which must therefore be increased in order to achieve resonance (absorption of rf energy). Such increments are very small, usually in parts per million (ppm). The difference between 2.3487T and 2.3488T is therefore about 42ppm. However a frequency scale is commonly used to designate the NMR signals, even though the spectrometer may operate by sweeping the magnetic field, and thus ...
The MRI machine is a large, cylindrical (tube-shaped) machine that creates a strong magnetic field around the patient. The magnetic field, along with a radiofrequency, alters the hydrogen atoms natural alignment in the body. Computers are then used to form a two-dimensional (2D) image of a body structure or organ based on the activity of the hydrogen atoms. Cross-sectional views can be obtained to reveal further details. MRI does not use radiation, as do X-rays or computed tomography (CT scans).. A magnetic field is created and pulses of radio waves are sent from a scanner. The strong magnetic field causes the hydrogen atoms in your body to align along the same axis. The radio waves knock the nuclei of the atoms in your body out of this aligned position. As the nuclei realign back into proper position, they send out radio signals. These signals are received by a computer that analyzes and converts them into an image of the part of the body being examined. This image appears on a viewing ...
TY - GEN. T1 - Lyapunovs stability theory-based model reference adaptive control for permanent magnet linear motor drives. AU - Chen, Y.. AU - Wu, J.. AU - Cheung, Chow Norbert. PY - 2004. Y1 - 2004. N2 - The simplified mathematical model of the permanent magnet linear motor is developed in this paper. By applying Lyapunovs stability theory, the authors propose a model reference adaptive controller. Then the controller is evaluated by simulation. The results show that the MRAS is superior to the conventional PID controller in dynamic performance and steady precision. The MRAS is robust to the parameter variation and external disturbance.. AB - The simplified mathematical model of the permanent magnet linear motor is developed in this paper. By applying Lyapunovs stability theory, the authors propose a model reference adaptive controller. Then the controller is evaluated by simulation. The results show that the MRAS is superior to the conventional PID controller in dynamic performance and ...
Another hypothesis is that moderate magnetic fields change gene expression. Ob/Ob mice when treated with 0.5 T direct current electromagnetic fields were found to increase their activity, lose weight and fat in a 6 day period. Gene array analysis of human embryonic stem cells in another experiment of 0.23-0.28 T static magnetic fields was conducted. Up-regulation of genes for insulin factors genes, peroxisome proliferative activity receptor were increased, and calcium channel gene and other genes for mitochondrial ribosomal protein S, and uncoupling protein 2. Down-regulation of tumor necrosis factor alpha and interleukin 6 were demonstrated for this transformation. Forkhead transcription factors are also upregulated at 5 days. Accelerated liver detoxification by moderate magnetic therapy of obesogens that disrupt homeostasis of metabolism of lipids ultimately resulting in obesity is another hypothesis.. ...
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http://www.marketsandmarkets.com/Market-Reports/magnetic-field-sensors-market-521.html. Early buyers will receive 10% customization on reports. The growth of the Magnetic Field Sensor Market is being propelled due to many reasons such as growing automobile productionmarkets, increasing demand in gaming consoles, increasing popularity of electronic compasses, and continuous demand for computer and computing peripherals,. The existing competition within the technologies, inconsistency in the magnetic field strength, and unavailability of a strong aftermarket are acting as the restraints for the market.. The market size of the Magnetic Field Sensor Market is expected to grow from the $1.6 billion that it accounted for in 2013 to $2.9 billion by 2020, at an estimated CAGR of 8.04% from 2014 to 2020. The volume of the magnetic sensors is currently estimated to be 5.9 billion units and is expected to rise up to 9.6 billion units at an estimated CAGR of 6.75% from 2014 to 2020.. Inquiry Before Buying ...
http://www.marketsandmarkets.com/Market-Reports/magnetic-field-sensors-market-521.html. Early buyers will receive 10% customization on reports. The growth of the Magnetic Field Sensor Market is being propelled due to many reasons such as growing automobile productionmarkets, increasing demand in gaming consoles, increasing popularity of electronic compasses, and continuous demand for computer and computing peripherals,. The existing competition within the technologies, inconsistency in the magnetic field strength, and unavailability of a strong aftermarket are acting as the restraints for the market.. The market size of the Magnetic Field Sensor Market is expected to grow from the $1.6 billion that it accounted for in 2013 to $2.9 billion by 2020, at an estimated CAGR of 8.04% from 2014 to 2020. The volume of the magnetic sensors is currently estimated to be 5.9 billion units and is expected to rise up to 9.6 billion units at an estimated CAGR of 6.75% from 2014 to 2020.. Inquiry Before Buying ...
Highly sensitive magnetic field sensor (credit: ETH Zurich/Peter Rüegg) Swiss researchers have succeeded in measuring changes in strong magnetic fields
Just north of a truck stop along Interstate 80 in Battle Mountain, Nevada, lies evidence that the Earths magnetic field once went haywire. Magnetic minerals in 15-million-year-old rocks appear to preserve a moment when the magnetic north pole...
Heres a peculiar phenomenon to ponder on; a dog aligns itself to the north-south axis with the earths magnetic field while defecating; according to the Fr
The energy spectrum and wave functions of holes in the valence band in semiconductor nanosystems, including quantum wells, quantum wires, and quantum dots, in an external magnetic field are theoretically investigated. The dependence of Zeeman splitting of the hole ground state upon variation in the size-quantization parameters with regard to the complex structure of the valence band and magnetic field-induced mixing of hole states is traced. Analytical formulas for describing the Zeeman effect in the valence band in the limiting cases of a quantum disk, spherically symmetric quantum dot, and quantum wire are presented. It is demonstrated that the g-factor of a hole is extremely sensitive to the hole-state composition (heavy or light hole) and, consequently, to the geometry of the size-quantization potential. ...
The subterranean and nocturnal habits of many ants and their movement through cluttered environments obstructing celestial cues make them excellent subjects for orientation by a magnetic compass. Ants are also suitable because they can be trained to forage at a dependable food site from which they return to the nest. Goal-oriented behaviours facilitate predictions of orientation during experimental treatments. However, depending on their habitat, ants may use landmarks, pheromones, vibrations, gravity, sun compass and polarized light to orient. These cues must be carefully masked in order to investigate the exclusive use of a magnetic compass.. Probably the first behavioural experiment testing magnetic orientation was carried out with iron filings attached to the body parts of the ant Myrmica ruginodis. Effects of magnetic fields on ant orientation were observed only when iron was attached to the antennae, with the pedicel being the most sensitive (Vowles 1954).. The strongest evidence for use ...
Today we understand that the static magnetic fields associated with lodestones and permanent magnets derive principally from the total angular momentum of electrons within those materials. Lone electrons possess spin, a quantized fundamental property of nature denoted by the letter S. In addition to S, electrons orbiting a nucleus also possess orbital angular momentum (L). Together S + L = J, or total angular momentum, is the property primarily responsible for bulk magnetism. Nuclei and other subatomic particles also possess spin angular momentum, but this effect is too weak to affect gross magnetic properties of a material ...
We report the results of direct measurement of remanent hysteresis loops on nanochains of BiFeO3 at room temperature under zero and ∼20 kOe magnetic field. We noticed a suppression of remanent polarization by nearly ∼40% under the magnetic field. The powder neutron diffraction data reveal significant ion displacements under a magnetic field which seems to be the origin of the suppression of polarization. The isolated nanoparticles, comprising the chains, exhibit evolution of ferroelectric domains under dc electric field and complete 180 switching in switching-spectroscopy piezoresponse force microscopy. They also exhibit stronger ferromagnetism with nearly an order of magnitude higher saturation magnetization than that of the bulk sample. These results show that the nanoscale BiFeO3 exhibits coexistence of ferroelectric and ferromagnetic order and a strong magnetoelectric multiferroic coupling at room temperature comparable to what some of the type-II multiferroics show at a very low ...
Magnetic flux threading a single-walled carbon nanotube (SWNT) is predicted to influence its electronic structure through the Aharonov-Bohm (AB) effect, causing bandgap oscillations and absorption peaks splitting. In order to verify these predictions, near infrared (NIR) photoluminescence (PL) and visible-NIR absorption in the Voigt geometry were measured at room temperature in external magnetic field (B) up to 74 T. The used aqueous surfactant solubilized SWNT samples show excitonic interband absorption peaks coming from a range of nanotube chiralities present in the sample. At fields B , 30 T, PL peaks showed red shifts and changes in peak widths. Magneto-PL spectra were successfully simulated, demonstrating that the observed spectral changes can be understood in terms of magnetic alignment of SWNTs (due to their predicted anisotropy magnetic properties) and B dependent changes of the bandgap due to the AB effect. By using the measured B-induced nanotube alignment and the measured average ...
Short pulse durations are critical for high temporal resolution in ultrafast electron imaging techniques. These techniques can create movies that allow scientists to observe, in real-time, how molecules interact in a chemical reaction, or how the structure of a material or microorganism is affected by the introduction of external stimuli.. To ensure that the electron pulse arrives at the sample or detector with the desired properties in spite of inter-electron repulsion, ultrafast electron imaging setups usually require means to compress the electron pulse both transversely and longitudinally. Conventional methods typically employ static-field elements such as solenoids, which are coils of wire that create uniform magnetic fields, to focus the electron beams. The use of static field elements can lead to the undesirable presence of static magnetic fields on the electron source (cathode) and the sample and can also cause temporal distortions when transporting ultrashort electron pulses.. To solve ...
Science Magazine ran with the also tame headline of Magnets Keep Blood Flowing but also had some problems in the text of their report (which I will get to).. The amount of press attention the study is getting is a bit odd. Its a small proof-of-concept study looking at the effects of strong magnetic fields on blood flow in vitro. I suspect part of the reason is the same as why so many people have been asking me about it - magnets are frequently marketed with health claims and these claims are often justified by the hand-waving explanation that magnetic fields improve blood flow. The concern is that this small study will be abused by huxsters to sell refrigerator magnets with unfounded health claims.. The history of health claims for magnets goes back as far as knowledge of magnetism itself. In the last decade there appears to have been an upsurge in this old scam - a plethora of products promising to treat arthritis, improve healing, or just give extra energy by placing a magnet over the ...
This circuit is under:, circuits, Magnetic Field Sensor circuit l51844 This DIY magnetic field sensor circuit is very simple and can detect fixed magnetic fields or fields that are varying at an audio frequency. The unit is not intended to provide accurate measurement of
... , also known as the geomagnetic field, is the magnetic field that extends from the Earth's interior out ... such magnetic materials record the Earth's magnetic field.[69] Statistical models[edit]. Each measurement of the magnetic field ... a changing magnetic field generates an electric field (Faraday's law); and the electric and magnetic fields exert a force on ... The mechanism by which the Earth generates a magnetic field is known as a dynamo.[50] The magnetic field is generated by a ...
Once captured by the white dwarf's magnetic field, the material from the inner disk travels along the magnetic field lines ... the accretion flow is channeled along the white dwarf's magnetic field lines until it impacts the white dwarf near a magnetic ... Magnetic fields[edit]. Alpha-2 Canum Venaticorum variables[edit]. Main article: Alpha-2 Canum Venaticorum variable ... strong magnetic fields on the star betray themselves in the spectrum. *abnormal emission or absorption lines may be indication ...
... or maintaining heavy equipment that may generate intense magnetic fields (such as a magnetic resonance imaging (MRI) machine). ... Magnetic fields, MRIs, and other lifestyle issues[edit]. A patient's lifestyle is usually not modified to any great degree ... A 2008 US study has found[21] that the magnetic field created by some headphones included with portable music players or cell ... Any kind of an activity that involves intense electro-magnetic fields should be avoided. This includes activities such as arc ...
For the consistency of a magnetic field to remain constant there must be an attractive magnetic field. If the motion of a ... The magnetic field is also very important since some birds and insects use the field to navigate over long distances. They are ... Earth's magnetic field[edit]. An electromagnet is a magnet that is created by an electric current.[22] The Earth has a solid ... Changing magnetic field through a coil of wire therefore must induce an EMF the coil which in turn causes current to flow.[30] ...
Zel'dovich Ya.B., Ruzmaikin A.A., Sokoloff D.D., (1990). Magnetic Fields in Astrophysics. Gordon & Breach Science Pub. ISBN 978 ... Fields. Physics Combustion. Astrophysics. Institutions. Institute of Chemical Physics. Moscow State University. Sternberg ... In 1952, Zeldovich began work in the field of elementary particles and their transformations. He predicted the beta decay of a ...
The Magnetic Fields. Archived from the original on July 18, 2011. Retrieved July 8, 2011. CS1 maint: discouraged parameter ( ... Wasps' Nests is the 1995 debut album by The 6ths, a side-project created by Stephin Merritt of The Magnetic Fields. Merritt ... CS1 maint: discouraged parameter (link) Hunter, James (1995). "Magnetic Fields". In Weisbard, Eric; Marks, Craig (eds.). Spin ... CS1 maint: discouraged parameter (link) Randall, Mac (2004). "The Magnetic Fields". In Brackett, Nathan; Hoard, Christian (eds ...
... magnetic fields; and electromagnetism. The two AP Physics C courses can be combined to make a unified Physics C course that ... Courses of this type were generally intended for students not majoring in a science-related field. No AP course or exam was ...
"The Magnetic Fields: The Charm of the Highway Strip". NME. September 16, 1995. p. 50. "The Magnetic Fields: The Charm of the ... The Charm of the Highway Strip is the third studio album by American indie pop band The Magnetic Fields, released in 1994. It ... The Magnetic Fields Stephin Merritt - vocals, instrumentation Claudia Gonson - management Sam Davol - cello Unterberger, Richie ... Randall, Mac (2004). "The Magnetic Fields". In Brackett, Nathan; Hoard, Christian (eds.). The New Rolling Stone Album Guide ( ...
Fields/magnetic; Time track motion; Physical energy (personal weariness, etc.); Self-determinism; Moisture (self); Sound ...
"The Magnetic Fields". The House of Tomorrow. Retrieved 2019-06-22. Courtney, Kevin (2012-05-02). "Magnetic Fields". The Irish ... she sang on several tracks on the Magnetic Fields' 1999 album 69 Love Songs. In addition to her vocal work with the Magnetic ... Shirley Simms is an American singer and songwriter known for her work as a member of indie pop band the Magnetic Fields. She ... In the late 1980s, before he started the Magnetic Fields, Merritt and Simms started the short-lived musical project Buffalo ...
"The Magnetic Fields: The Wayward Bus / Distant Plastic Trees (Reissue)". PopMatters. December 21, 2016. The New Rolling Stone ... Distant Plastic Trees is the debut studio album by American indie pop band The Magnetic Fields, released in 1991. Lead vocals ... "Magnetic Fields". Trouser Press. Retrieved 13 November 2020. CS1 maint: discouraged parameter (link) v t e. ... "Distant Plastic Trees - Magnetic Fields". AllMusic. Retrieved February 22, 2016. CS1 maint: discouraged parameter (link) ...
... magnetic fields; electromagnetism; physical and geometric optics; and quantum, atomic, and nuclear physics. Through inquiry- ...
Subsequent planning for an encounter with Saturn added many more goals: Map the magnetic field of Saturn and determine its ... "Jovian Magnetic Field". NASA / National Space Science Data Center. Retrieved September 24, 2013. "Pioneer 11 Mission ... "Magnetic Fields". NASA / National Space Science Data Center. Retrieved February 19, 2011. "Quadrispherical Plasma Analyzer". ... charted Saturn's magnetosphere and magnetic field and found its planet-size moon, Titan, to be too cold for life. Hurtling ...
For example, some animals are able to detect electrical[9] and magnetic fields,[10] air moisture,[11] or polarized light,[12] ... "Built-in GPS in birds in tune with Earth's magnetic field". Baylor College of Medicine.. ... Cressey D (2012). "Pigeons may 'hear' magnetic fields". Nature. doi:10.1038/nature.2012.10540. ISSN 1744-7933.. ... Magnetoception (or magnetoreception) is the ability to detect the direction one is facing based on the Earth's magnetic field. ...
... axial electric field and radial magnetic field). This orbital rotation of the electrons is a circulating Hall current, and it ... where the combination of the radial magnetic field and axial electric field cause the electrons to drift in azimuth thus ... The radial magnetic field is designed to be strong enough to substantially deflect the low-mass electrons, but not the high- ... A radial magnetic field of about 100-300 G (0.01-0.03 T) is used to confine the electrons, ...
"Magnetic Fields Festival". magneticfields.in. Retrieved 24 October 2017. "Soundwave Croatia". soundwavecroatia.com. Retrieved ... Magnetic Fields in Rajasthan, India (2014) Uprising Reggae Festival in Bratislava, Slovakia (2014) Stir it up! Rewind it! in ... The 264 Cru Magnetic Fields in Rajasthan, India (2015) Dimensions Festival in Pula, Croatia (2016) In April 2017, Mo, along ...
The electromagnetic force is carried by electromagnetic fields composed of electric fields and magnetic fields, and it is ... a magnetic field transforms to a field with a nonzero electric component and conversely, a moving electric field transforms to ... Magnetic Field Strength Converter Electromagnetic Force - from Eric Weisstein's World of Physics The Deflection of a Magnetic ... "Electron Spin and Magnetic Moment." Stern, Dr. David P.; Peredo, Mauricio (2001-11-25). "Magnetic Fields - History". NASA ...
"Magnetic Fields Festival". "7.27.17 Fractalfest". fractaltribe. "TomorrowWorld 2016 Canceled". Billboard. "RA News: Mountain ...
CS1 maint: discouraged parameter (link) Randall, Mac (2004). "The Magnetic Fields". In Brackett, Nathan; Hoard, Christian (eds ...
The Magnetic Fields. Archived from the original on July 18, 2011. Retrieved July 8, 2011. Abrams, H., 1983. A World of Animals ... and have conserved habitat at 50 field sites. They also have over 200 conservation scientists working in 35 countries around ...
"The Magnetic Fields: 69 Love Songs". Pitchfork. Retrieved June 30, 2011. Himmelsbach, Erik (October 14, 1999). "Magnetic Fields ... The Magnetic Fields, '69 Love Songs')". Rolling Stone. May 31, 2012. Retrieved February 18, 2016. "The 500 Greatest Albums Of ... 69 Love Songs is the sixth studio album by American indie pop band the Magnetic Fields, released on September 7, 1999 by Merge ... As its title indicates, 69 Love Songs is a three-volume concept album composed of 69 love songs, all written by Magnetic Fields ...
The Magnetic Fields. English translation and introduction by David Gascoyne. (London: Atlas Press, 1997). p. 39 Brockett and ...
Strong magnetic fields]. Zeitschrift für Physik (in German). 81 (3-4): 186-194. Bibcode:1933ZPhy...81..186P. doi:10.1007/ ... have now passed so deeply into the literature that it is hard to identify his contribution to conductivity in magnetic fields ... Their results still serve as the basis for mean-field theories of structural phase changes in complete alloys. Although most of ... At Birmingham he worked on nuclear forces, scattering, quantum field theories, collective motion in nuclei, transport theory ...
The Magnetic Fields. Archived from the original on 5 March 2008. Retrieved 8 July 2011. CS1 maint: discouraged parameter (link) ...
In the 1960s the moon's effect on Jupiter's magnetic field was discovered.[1] The flybys of the two Pioneer probes, Pioneer 10 ... 1979). "Magnetic Field Studies at Jupiter by Voyager 1: Preliminary Results". Science. 204 (4396): 982-987. Bibcode:1979Sci... ... Juno's mission is primarily focused on improving our understanding of planet's interior, magnetic field, aurorae, and polar ... No remote sensing; Gravity measurements reveal differentiated interior, large iron core; magnetic field? ...
Zel'dovich Ya.B., Ruzmaikin A.A., Sokoloff D.D. (1990). Magnetic Fields in Astrophysics. Gordon & Breach Science Pub. ISBN 978- ... In 1952, Zeldovich began work in the field of elementary particles and their transformations. He predicted the beta decay of a ...
Flowers in Magnetic Fields. Toronto, ON: Guernica Editions, 1994. Backscatter: New and Selected Poems. Toronto, ON: Guernica ...
"Magnetic Fields at Uranus". Science. 233 (4759): 85-89. Bibcode:1986Sci...233...85N. doi:10.1126/science.233.4759.85. PMID ... doi:10.1016/0019-1035(88)90054-1. R. A. Jacobson (2014) 'The Orbits of the Uranian Satellites and Rings, the Gravity Field of ...
Mason, Amelie (May 27, 2015). "A Thoughtful Interview With Stephin Merritt Of The Magnetic Fields". The ARTery. "The Best" cd ... Heaton, Dave (January 13, 2008). "The Magnetic Fields: Distortion". PopMatters. "Beach Boys Threaten Katy Perry Over ' ... and the Magnetic Fields (from their 2008 album Distortion). The latter song describes a protagonist who wishes to murder upper- ... the Magnetic Fields' "California Girls", and Katy Perry's "California Gurls". In 1984, David Lee Roth recorded a cover version ...
Broverman, Neal (4 February 2010). "Magnetic Fields Stephin Merritt". Advocate.com. Retrieved 3 May 2013. CS1 maint: ...
Similar to functional magnetic resonance imaging, which uses changes in the magnetic properties of blood resulting from ... Hemoencephalography (HEG) is a relatively new neurofeedback technique within the field of neurotherapy. Neurofeedback, a ...
Sheikin, I.; Grenier, B.; Huxley, Ad.,title=Magnetic field-induced superconductivity in the ferromagnet URhGe,volume=309,issue= ...
Advances in the fields of molecular biology and genetics, as well as the use of animal models have been of great importance in ... Some evidence for this statement has been provided by studies using computed tomographic (CT) scans and magnetic resonance ... Brain structures of children with craniosynostosis were evaluated using magnetic resonance imaging.[10] Differences were seen ...
Tyner, James A. (2017). From Rice Fields to Killing Fields: Nature, Life, and Labor under the Khmer Rouge. Syracuse, New York: ... Pol Pot displayed what Chandler called a "genteel charisma",[436] and what Short described as a "magnetic personality".[344] As ... Tyner, James A. (2017). From Rice Fields to Killing Fields: Nature, Life, and Labor under the Khmer Rouge. Syracuse, New York: ... Main articles: Democratic Kampuchea, Khmer Rouge Killing Fields, and Khmer Rouge rule of Cambodia ...
The oscillating electric field of a light wave acts on the charges within a particle, causing them to move at the same ... For the magnetic phenomenon, see Rayleigh law. For the stochastic distribution, see Rayleigh distribution. For the wireless ... proportional to the dipole moment induced by the electric field of the light. In this case, the Rayleigh scattering intensity ...
... only the head and brain can be imaged at these high magnetic field strengths.[53] ... "Magnetic Resonance Materials in Physics, Biology and Medicine. 26 (1): 99-113. doi:10.1007/s10334-012-0353-4. ISSN 0968-5243. ... PET scans are increasingly read alongside CT or magnetic resonance imaging (MRI) scans, with the combination (called "co- ... Alternative methods of scanning include x-ray computed tomography (CT), magnetic resonance imaging (MRI) and functional ...
Chemboxes which contain changes to verified fields. *Chemboxes which contain changes to watched fields ... Magnetic susceptibility (χ). -176·10−6 cm3/mol Thermal conductivity 0.159 W/m·K (70 °C). 0.151 W/m·K (100 °C). 0.138 W/m·K (160 ...
Electric flow will also be accompanied by a magnetic field. Graeme Bartlett (talk) 22:55, 3 August 2021 (UTC). CNN report on ...
Prior to its release on DVD in 2001, all the master negatives and magnetic sound tapes had to undergo a thorough physical and ... Instead he shows talent for design and fashion; a field where he later enjoys a certain success and becomes marginally involved ...
Interdisciplinary fields[edit]. Some interdisciplinary sub-specialties of medicine include: *Aerospace medicine deals with ... and nuclear magnetic resonance tomography. Interventional radiologists can access areas in the body under imaging for an ... Related non-medical fields include psychotherapy and clinical psychology.. *Preventive medicine is the branch of medicine ... Many other health science fields, e.g. dietetics. Education and legal controls[edit]. Main articles: Medical education and ...
Magnetic levitation railway (proposed)Edit. In June 2020 the CDU Berlin (then in opposition at the state level) proposed to ... In 1946, the headquarters of the Soviet Air Forces moved to Schönefeld from Johannisthal Air Field. ... build a Magnetic Levitation Train of the Transport System Bögl (developed by the Bavarian construction company Max Bögl) to the ...
Magnetic resonance imaging (MRI) and single-photon emission computed tomography (SPECT) are two of the tests that can identify ... This includes construction, landscaping, forestry, brush clearing, land surveying, farming, railroad work, oil field work, ...
A related field, veterinary chiropractic, applies manual therapies to animals and is recognized in 40 US states,[66] but is not ... Palmer, a magnetic healer, hypothesized that manual manipulation of the spine could cure disease.[214] The first chiropractic ... In the U.S. chiropractors obtain a first professional degree in the field of chiropractic.[163] Chiropractic education in the U ... another medical system based on magnetic healing and bonesetting; both systems were founded by charismatic midwesterners in ...
For example, if the patient has their right hand x-rayed, the radiographer includes a radiopaque "R" marker within the field of ... Radiographers now perform fluoroscopy, computed tomography, mammography, ultrasound, nuclear medicine and magnetic resonance ...
a b Double-Blind Field Evaluation of the MOLE Programmable Detection System, Sandia National Laboratories Archived November 4, ... Aitken, M. J. (1959). Test for Correlation Between Dowsing Response and Magnetic Disturbance. Archaeometry 2: 58-59. ... The pipes were buried 50 centimeters (19.7 in) under a level field, the position of each marked on the surface with a colored ... and Eduardo Balanovski reported in 1978 a series of experiments they conducted that searched for unusual electromagnetic fields ...
... which may have significant impacts on their interior magnetic fields.[169][170] It has been estimated that the transition from ...
A bilateral temporal visual field defect (due to compression of the optic chiasm) or dilation of the pupil, and the occurrence ... Brain metastasis in the right cerebral hemisphere from lung cancer, shown on magnetic resonance imaging. ... "IARC classifies radiofrequency electromagnetic fields as possibly carcinogenic to humans" (PDF). World Health Organization ... visual field impairment, impaired sense of smell, impaired hearing, facial paralysis, double vision, or more severe symptoms ...
Similarly, the magnetic field creates a disturbance proportional to the magnetic susceptibility.) As the electromagnetic fields ... In non-magnetic media with μ. r. =. 1. {\displaystyle \mu _{\mathrm {r} }=1}. , ... Most naturally occurring materials are non-magnetic at optical frequencies, that is μr is very close to 1,[citation needed] ... Since intensity is proportional to the square of the electric field, it will depend on the depth into the material as exp(−4πκz ...
... magnetic brain stimulation using transcranial magnetic stimulation, psychopharmacological manipulation, optogenetic ... Physicist Sean M. Carroll has written that the idea of a soul is incompatible with quantum field theory (QFT). He writes that ... In Helena Blavatsky's Theosophy, the soul is the field of our psychological activity (thinking, emotions, memory, desires, will ... Neuroscience as an interdisciplinary field, and its branch of cognitive neuroscience particularly, operates under the ...
Diamagnetic materials are repelled by a magnetic field; an applied magnetic field creates an induced magnetic field in them in ... Because χv is derived from the ratio of the internal magnetic field to the applied field, it is a dimensionless value. ... "Electrons in a magnetic field. Retrieved 27 November 2012.. *^ Lévy, L.P.; Reich, D.H.; Pfeiffer, L.; West, K. (1993). " ... diameter vertical bore of a Bitter solenoid in a magnetic field of about 16 teslas at the Nijmegen High Field Magnet Laboratory ...
Charpak, G.; Lederman, L.M.; Sens, J.C.; Zichichi, A. (1960-08-01). "A method for trapping muons in magnetic fields, and its ... The Magnetic Moment of the Free Muon". Physical Review. 105 (4): 1415-1417. Bibcode:1957PhRv..105.1415G. doi:10.1103/PhysRev. ...
... magnetic and electric properties; radioactivity and solubility in hydrogen chloride (HCl).[5]:97-113[8]:39-53 ... Mineral collecting is also a recreational study and collection hobby, with clubs and societies representing the field.[32][33] ... Biomineralogy is a cross-over field between mineralogy, paleontology and biology. It is the study of how plants and animals ... the field has made great advances in the understanding of the relationship between the atomic-scale structure of minerals and ...
A seminal experiment in this field was conducted by Benjamin Libet in the 1980s, in which he asked each subject to choose a ... Using functional magnetic resonance imaging with specialized multivariate analyses to study the temporal dimension in the ... In a recent study using functional magnetic resonance imaging, alien movements were characterized by a relatively isolated ...
Magnetic field * sw:Magnetic field. Mahābhārata * sw:Mahābhārata. Maize * sw:Maize. Malaria * sw:Malaria. Malnutrition * sw: ...
With these in operation the average field in the detector is reduced to about 50 mG. The magnetic field at various PMT ... The average geomagnetic field is about 450 mG and is inclined by about 45° with respect to the horizon at the detector site. ... Magnetic tapes are used in offline system to store data and most of the analysis is accomplished here. The offline processing ... This presents a problem for the large and very sensitive PMTs which prefer a much lower ambient field. The strength and uniform ...
Document-oriented databases such as IBM Notes allow multiple values in items (fields), do not require a schema, come with built ... The authorizations can be granular, down to the field level in specific records all the way up to 10 different parameters that ... Attributes (Notes fields) that are null take up no space in a database; ... With release of Notes 4 in 1996, replication was changed so that it now occurs at field level. ...
... or due to an external factor such as exposure to fire or water or high magnetic fields, or suffering a sharp impact or ... The phenomenon of disk failure is not limited only to drives, but also applies to other types of magnetic media. In the late ... Bad sectors: some magnetic sectors may become faulty without rendering the whole drive unusable. This may be a limited ... Data from a failed drive can sometimes be partially or totally recovered if the platters' magnetic coating is not totally ...
magnetic B field, magnetic flux,. magnetic vector potential (. B. G. ,. Φ. m. G. ,. A. G. ). {\displaystyle \left(\mathbf {B ... magnetic B field, magnetic flux,. magnetic vector potential (. B. SI. ,. Φ. m. SI. ,. A. SI. ). {\displaystyle \left(\mathbf {B ... magnetic H field H. A/m. Oe. (cm−1/2⋅g1/2⋅s−1). H. G. H. SI. =. 4. π. μ. 0. =. 4. π. ×. 10. −. 3. Oe. 1. A/m. {\displaystyle {\ ... magnetic B field B. T. G. (cm−1/2⋅g1/2⋅s−1). B. G. B. SI. =. 4. π. μ. 0. =. 10. 4. G. 1. T. {\displaystyle {\frac {\mathbf {B ...
The field has since broadened to include every class of materials, including ceramics, polymers, semiconductors, magnetic ... As such, the field was long considered by academic institutions as a sub-field of these related fields. Beginning in the 1940s ... The field of nanomaterials is loosely organized, like the traditional field of chemistry, into organic (carbon-based) ... The field thus maintains close relationships with these fields. Also, many physicists, chemists and engineers also find ...
An eye which is accompanied by a limitation in the fields of vision such that the widest diameter of the visual field subtends ... Sadato, N. (2005). How the blind "see" Braille: lessons from functional magnetic resonance imaging. The Neuroscientist: A ... Defined as having central visual acuity of less than 3/60 with normal fields of vision, or gross visual field restriction. ... visual field defect in which the peripheral field is contracted to such an extent that the widest diameter of the visual field ...
The turtles can perceive both the magnetic fields intensity and its inclination angle, the angle that the field lines make ... Sea turtles use the earths magnetic fields to navigate back to the area where they were born decades earlier, according to a ... With magnetic fields running across the peninsula, individual turtles might be making navigational errors and nesting on ... Loggerhead turtles are known to use the earths magnetic fields to nest on Floridas Gulf beaches within about 40 to 50 miles ...
... Direct effects of exposure to large static magnetic fields include vertigo, nausea, cardiac arrhythmia and ... Magnetic field flux density gradient maps should be created by taking field strength measurements and marking lines around ... Notices must be posted where appropriate to warn staff of the presence of the magnetic field and of the possibility that it may ... 2. Guidelines for limiting exposure to time-varying electric, magnetic and electromagnetic fields (up to 300GHz). Health ...
Static Magnetic Fields-including DC electricity.. CDC/NIOSH Publications on EMF. Manual for Measuring Occupational Electric and ... EMF Questions and Answers: Electric and Magnetic Fields Associated with the Use of Electric Powerpdf iconexternal icon. ... Non-ionizing Radiation, Part I: Static and Extremely Low Frequency Electric and Magnetic Fieldspdf iconexternal icon. Monograph ... Electric and Magnetic Fields Information on possible health risks from ELF EMF and and links to NIEHS publications. ...
Earths magnetic field, also known as the geomagnetic field, is the magnetic field that extends from the Earths interior out ... such magnetic materials record the Earths magnetic field.[69] Statistical models[edit]. Each measurement of the magnetic field ... a changing magnetic field generates an electric field (Faradays law); and the electric and magnetic fields exert a force on ... The mechanism by which the Earth generates a magnetic field is known as a dynamo.[50] The magnetic field is generated by a ...
Nuclear precession magnetic field sensor, optically pumped magnetic field sensor, fluxgate magnetometer, search coil magnetic ... Kádár, Z.; Bossche, A.; Sarro, P.M.; Mollinger, J.R. Magnetic-field measurements using an integrated resonant magnetic-field ... Emmerich, H.; Schöfthaler, M. Magnetic field measurements with a novel surface micromachined magnetic-field sensor. IEEE Tans. ... If the targeted B-field is larger than the earth magnetic field (maximum value around 60 µT), the sensor does not need to be ...
... brains can relay crucial information about Earths magnetic field, possibly providing the animals with an internal GPS. ... Pigeons remarkable navigational feats have long been pegged to the birds ability to sense magnetic fields, but pinning down ... Earths magnetic field in space is really the average of all local magnetic fields in the planet. Imagine there were 20+ bar ... Submission: Pigeons may hear magnetic fields. The Recent Changes In Earths Magnetic Field. ...
The research area of "Cosmic Magnetic Fields" is dedicated to the exploration of solar, stellar, and galactic magnetic fields, ... Magnetic fields and turbulence in stars, accretion disks, and galaxies. Computer simulations of dynamos, magnetic instabilities ... Magnetic fields drive the non-thermal output of many cosmic objects, in particular that of the Sun and other stars. It is the ... Yet the magnetic field is still among the least-studied unknowns of the universe. The science focus of the Branch-I is ...
Neither group is able to observe the twofold MIE in ambient magnetic fields or any MFE, even using fields as strong as 1,000 mT ... 80 mT is about 1,000 times stronger than the Earths magnetic field and about 100 times weaker than the strongest fields used ... the general idea that magnetic nuclei and applied magnetic fields can alter the coherent spin dynamics of radical pairs and ... 1994) Magnetic field effects on B12 ethanolamine ammonia lyase: Evidence for a radical mechanism. Science 263:958-960. ...
Purchase Biological Effects of Electric and Magnetic Fields - 1st Edition. Print Book & E-Book. ISBN 9780121602611, ... Direct Current Magnetic Fields: Mechanisms of Action, A.D. Rosen.. *Physiological Effects of Magnetic Fields May Be Mediated ... Neuroendocrine Responses to Electric and Magnetic Fields, B.W. Wilson.. *Behavioral Effects of Electromagnetic Fields in ... Biological Effects of Electric and Magnetic Fields 1st Edition. Sources and Mechanisms. 0.0 star rating Write a review ...
This is a four part series covering magnetic fields, including the history, terminology, and operation of magnetic fields. This ...
... and reviews many of the still little understood questions related to the processes underlying planetary magnetic fields and ... Earth magnetic field planetary dynamo simulations planetary interior dynamics magnetic instability Jupiter magnetosphere Saturn ... variation of magnetic field strength CHAMP space mission SWARM space mission numerical modelling of planetary magnetic fields ... Magnetic fields play an important role in making a planet habitable by protecting the environment from the solar wind. Without ...
Migrating birds spy out magnetic field. 10 November 2004 SOME birds, especially those that migrate at night, use the Earths ... magnetic field to find their way. They presumably sense the north-south direction of the field and use that as a reference to ... Now German researchers have shown that the European garden warbler turns its head to detect the Earths magnetic field, adding ... to evidence that the birds detect magnetic fields with their eyes.. Henrik Mouritsen and colleagues at the University of ...
Related Threads on Rotating magnetic fields Magnetic field in a rotating magnet ... resulting magnetic field i will get?. does the magnetic field have a spatial persistence, i.e. does it change immediately as ... does the magnetic field have a spatial persistence, i.e. does it change immediately as soon as the object is moved, or not? ... what happens to the magnetic field produced by the magnet?. if i bring another identical magnet near this rotating magnet, the ...
Electric Field Strength. Magnetic Field:. Field Strength. Magnetic Field:. Flux Density. Units of Measurement. volts per metre ... Electric and magnetic fields in everyday life. The electric field strengths and the magnetic flux densities of electrical ... Electric and magnetic fields. Electric field caused by electric charges When current flows, electrical appliances and wires ... Magnetic field caused by current High-frequency fields, by contrast, have a frequency ranging from 100 kilohertz to many ...
The computer further performs an arithmetic processing of first-order differentiation on the waveform of the magnetic fields in ... of the signal processing circuit so as to generate at least one first-order differential waveform of the magnetic fields to be ... collecting output signals of the driving circuit in the form of data representing at least one waveform of the magnetic fields ... from the live body and for performing an arithmetic processing on the data representing the waveform of magnetic fields; a ...
... shielding high magnetic fields, school emergency management plan, fire safety homeschool, getting involved in community, risk ... magnetic shielding materials create an area of lower magnetic field in their vicinity by attracting the magnetic field lines to ... Laptops produce at least two types of electromagnetic fields: AC electric fields and AC magnetic fields. To shield the electric ... leaving less magnetic field on either side of the flat shield. But the magnetic field from a powerline varies from moment to ...
But even far away from these active regions, magnetic... ... The Sun is replete with magnetic fields, with sunspots, pores ... First synoptic maps of photospheric vector magnetic field from SOLIS/VSM: non-radial magnetic fields and hemispheric pattern of ... Inferring the magnetic field vector in the quiet Sun. III. Disk variation of the Stokes profiles and isotropism of the magnetic ... G.E. Hale, On the probable existence of a magnetic field in Sun-spots. Astrophys. J. 28, 315 (1908). doi: 10.1086/141602 ADS ...
"Earths magnetic field is important to us," the professor told those in attendance at the meeting. "[3.45 billion years ago] is ... "If, even with this magnetic field, we are losing hydrogen and water, that would suggest the palaeo-Earth in its infant state ... They believe that they could someday find evidence proving the existence of the magnetic field 3.6 to 4 billion years ago. ... Scientists have uncovered evidence contained within South African rocks which shows that a weak magnetic field was present on ...
Why are the magnetic fields of the outer gas giants, Uranus and Neptune so unique? Further more, could these fields be used to ... Why are the magnetic fields of the outer gas giants, Uranus and Neptune so unique? Further more, could these fields be used to ... Magnetic Field Mystery Solved? 28 Posted by michael on Friday March 12, 2004 @08:09PM. from the strange-attractor dept. ... Smaller cells of slower-moving fluid will mean a much weaker magnetic field. Now we only need to wait a few billion years to ...
Magnetic Field Produced by a Current Carrying Wire. Any electrical current creates a magnetic field. The magnetic field around ... A magnetic field is a vector field responsible for generating forces on electrically charged objects and magnets. Magnetic ... Earths Magnetic Field. The magnetic field of Earth is directional nearly north-to-south, although slightly askance, meaning ... The strength of the earths magnetic field is according to the strength of the suns magnetic field.[5] ...
Using magnetic fields and cells containing magnetic nanoparticles, researchers have demonstrated that levitated cells can grow ... Killian uses magnetic fields to trap and manipulate atoms that have been cooled to near absolute zero. He had been working on a ... Scientists Grow Cells in 3-D Using Magnetic Fields. By Jade Boyd 2010-06-01T09:08:52Z. Health ... "We wondered if we might be able to use magnetic fields to levitate the treated cells off the bottom of the petri dish, allowing ...
Magnetic Fields (EMF) in a socially responsible manner. Over the past 40+ years, we have supported, funded, and conducted EMF ... Health-related research around EMF focuses primarily on magnetic field exposures. Magnetic fields are created whenever ... the magnetic fields near distribution lines vary with power flow and design. According to the NIEHS, magnetic fields under main ... An individuals magnetic field exposure varies throughout the day and depends on multiple factors including field levels in the ...
may then be eliminated using magnetic induction (17) to give. and note that one can expanded the first term on the right-hand ... We do not have a clear understanding of how all magnetic fields arise or how they evolve. Studies of cosmic magnetic fields are ... The Euler scalars are conserved along field lines such that they allow for the description of magnetic field lines. The field ... The starting point for most discussions of magnetic induction is the set of Maxwells equations, which in MKS units are. where ...
Baby eels have joined the ever-growing club of animals that live their lives along magnetic lines. Researchers described these ... They consistently turned their bodies to run parallel with magnetic lines, but the direction of those lines varied depending on ... Lobsters, butterflies, and whales all follow their internal compasses along magnetic lines. Adult European eels, too. But we ...
The dynamical evolution and turbulent decay of magnetic fields is shown for various knotted and linked magnetic structures. We ... The dynamics of magnetic fields is strongly affected by its topological structure, rather then its geometry alone. For linked ... Numerical Analysis Seminars: Topological aspects in magnetic field dynamics. Presented by Simon Candelaresi, AlbaNova Univ. ... Magnetic helicity arises naturually during the dynamo process, where through turbulent motions strong large-scale magnetic ...
... and a magnetic shield. The magnetic shield is formed in a elongated hollow shape having openings at both sides thereof. The gas ... polarized light adjusted so that the vibration direction of an electric field coincides with the axis direction of the magnetic ... shield onto the gaseous atoms sealed in the gas cell along a direction perpendicular to the axis of the magnetic shield. The ... A magnetic field measurement apparatus includes an irradiation portion, a gas cell, a measurement unit (polarization separation ...
... steel is subjected to strong AC magnetic fields? Does the permeability change? Re: Altering steel in a magnetic field. Current ... Subject: Altering steel in a magnetic field. Date: Sun Aug 15 21:22:16 1999. Posted by Bud Munshaw. Grade level: undergrad ...
Now, a recent study finally sheds light on how some birds visually see Earths magnetic field. ... Earths magnetic field plays a vital role in everything from animal migration to protecting the Earth from the Suns harsh ... Now, a recent study finally sheds light on how some birds visually see Earths magnetic field. Birds use Earths magnetic field ... which lead to a magnetic field. The continual movement of liquid metal through this magnetic field creates stronger electrical ...
Slag left over from Iron Age copper smelting shows the Earths magnetic field was stronger and more variable than scientists ... Faster Magnetic Field. SAN FRANCISCO - Slag left over from Iron Age copper smelting shows the Earths magnetic field was ... The Earths magnetic field comes from the movement of molten iron in the core. The fields strength and structure are ... Then they measured the field strength in the raw slag.. They found that the magnetic field abruptly spiked twice during the 180 ...
  • Pigeons' remarkable navigational feats have long been pegged to the birds' ability to sense magnetic fields, but pinning down how they do so has frustrated scientists for years. (slashdot.org)
  • The North geomagnetic pole actually represents the South pole of the Earth's magnetic field, and conversely the South geomagnetic pole corresponds to the north pole of Earth's magnetic field (because opposite magnetic poles attract and the north end of a magnet, like a compass needle, points toward the Earth's South magnetic field, i.e., the North geomagnetic pole near the Geographic North Pole). (wikipedia.org)
  • While the North and South magnetic poles are usually located near the geographic poles, they slowly and continuously move over geological time scales, but sufficiently slowly for ordinary compasses to remain useful for navigation. (wikipedia.org)
  • However, at irregular intervals averaging several hundred thousand years, the Earth's field reverses and the North and South Magnetic Poles respectively, abruptly switch places. (wikipedia.org)
  • These reversals of the geomagnetic poles leave a record in rocks that are of value to paleomagnetists in calculating geomagnetic fields in the past. (wikipedia.org)
  • [8] The polarity of the Earth's magnetic field is recorded in igneous rocks , and reversals of the field are thus detectable as "stripes" centered on mid-ocean ridges where the sea floor is spreading, while the stability of the geomagnetic poles between reversals has allowed paleomagnetism to track the past motion of continents. (wikipedia.org)
  • As long as the Earth's magnetic poles don't radically shift, the turtles could mark a location in their mind when they're born. (slashdot.org)
  • It's one of the weakest magnetic field regions, and could be ground zero for when the North and South poles finally 'flip' their magnetic fields. (coasttocoastam.com)
  • Unlike the north and south geographic poles, the magnetic poles wander in an erratic way, obeying the movement of sloshing liquid iron and nickel in Earth's outer core. (universetoday.com)
  • That's a bit stronger than the earth's magnetic field today (0.6 Gauss at the poles, 0.3 Gauss at the equator). (creation.com)
  • High above Earth's poles, solar and terrestrial magnetic fields linked up (reconnected) to form conduits for solar wind. (bibliotecapleyades.net)
  • Earth's magnetic field is decaying at such a rapid rate that scientists think the poles may flip. (rt.com)
  • As well as giving us our north and south poles, the magnetic field blankets the Earth, protecting it from solar winds and cosmic radiation. (rt.com)
  • What's more, those cells were most sensitive to the magnetic field ranges that correspond to Earth's real ones - 20 micro-Tesla (μT) at the magnetic equator to more than 60 μT at the magnetic poles. (popsci.com)
  • The geomagnetic poles are currently roughly coincident with the geographic poles, but occasionally the magnetic poles wander far away from the geographic poles and undergo an "excursion" from their preferred state. (usgs.gov)
  • For instance, in a compact bar magnet or " dipole ," field lines spread out from one pole and converge towards the other, and of course, the magnetic force is strongest near the poles where they come together. (nasa.gov)
  • It was the magnetic poles. (sott.net)
  • Millions of years ago, the Earth's magnetic poles had been on the opposite sides of the planet. (bibliotecapleyades.net)
  • If these magnetic blocs gain enough strength and weaken the dipole even more, they will force the north and south poles to switch places as they strive to regain supremacy. (bibliotecapleyades.net)
  • Mercury's magnetic field is approximately a magnetic dipole (meaning the field has only two magnetic poles) apparently global, on planet Mercury. (wikipedia.org)
  • Like Earth's, Mercury's magnetic field is tilted, meaning that the magnetic poles are not located in the same area as the geographic poles. (wikipedia.org)
  • The Earth's magnetic field serves to deflect most of the solar wind, whose charged particles would otherwise strip away the ozone layer that protects the Earth from harmful ultraviolet radiation. (wikipedia.org)
  • In particular, superconductors , which can carry high levels of current, or charged particles, expel magnetic field lines from their interiors, essentially bending or distorting these lines. (space.com)
  • Once in every orbit around the Earth the Moon moves through the magnetic tail - the region on the nightside of the Earth where the magnetic field is drawn out into a million or more kilometre long tail pointing away from the Sun. In the middle of the tail there is a region full of energetic electrons and other charged particles (the plasmasheet). (innovations-report.com)
  • The magnetic field, in contrast, describes the component of the force that is proportional to both the speed and direction of charged particles. (wikipedia.org)
  • The work also suggests that these signals come from a part of the inner ear called the lagena, further complicating matters for researchers in the field. (slashdot.org)
  • According to the British and the Soviet researchers, adding a wobbling magnetic field at the cyclotron frequency disturbs the precession to such an extent that it could loosen the bond between the ion and the protein. (newscientist.com)
  • Now German researchers have shown that the European garden warbler turns its head to detect the Earth's magnetic field, adding to evidence that the birds detect magnetic fields with their eyes. (newscientist.com)
  • Researchers from the Electric Power Research Institute (EPRI) surveyed 992 American homes in 1993 and found an all-room average magnetic field of 0.9 mG, though background field levels in some rooms exceeded 16 mG. (sce.com)
  • This change in transmission allowed the researchers to find the size and direction of the magnetic field at the same time. (wired.com)
  • The researchers inserted stents and nanoparticles into a group of control rats, but without using a magnetic field. (redorbit.com)
  • Fourteen days after using the magnetic field and a single dose of magnetic nanoparticle-encapsulated paclitaxel, the researchers found the rat arteries had significantly lower restenosis than found in arteries of control rats that had no magnetic treatment. (redorbit.com)
  • The degree of polarization of light from the clouds is influenced by the direction and strength of the local magnetic fields, so the researchers measured polarization to determine magnetic field strength. (universetoday.com)
  • However, the new magnetic wormhole funnels the magnetic field from one side of the cylinder to another so that it is "invisible" while in transit, seeming to pop out of nowhere on the exit side of the tube, the researchers report today (Aug. 20) in the journal Scientific Reports . (space.com)
  • Researchers have established that birds can sense the earth's magnetic field and use it to orient themselves. (eurekalert.org)
  • The researchers concluded that even low-level electromagnetic noise in the frequency range blocked by the aluminum screens -- probably coming from AM radio signals and electronic equipment running in buildings --somehow interfered with the urban robins' magnetic orientation ability. (eurekalert.org)
  • Newswise - A nanoparticle-based drug delivery concept in which an applied magnetic field directs the accumulation in tumor cells of custom-designed, drug-filled nanocarriers has been demonstrated by University at Buffalo researchers. (newswise.com)
  • Along with the photodynamic drug, the UB researchers encapsulated inside the nanocarriers iron oxide nanoparticles, which allowed them to respond to externally applied magnetic fields. (newswise.com)
  • In the paper, the researchers propose that pions are produced by the magnetic excitation of the nucleons during the collision, with one of the colliding nuclei causing magnetic transitions in the other. (elsevier.com)
  • Researchers would like strong magnetic field pulses with femtosecond durations without traveling to a major facility, but producing them with a coil of wire isn't possible. (aps.org)
  • The conventional coil of wire, or solenoid, cannot ramp up a field rapidly enough to study the fastest magnetic processes, so researchers must go to specialized facilities. (aps.org)
  • Understanding the femtosecond-scale response of materials to magnetic fields would help researchers push the boundaries of these technologies and others. (aps.org)
  • Researchers from the U.S. Department of Energy (DOE)'s Lawrence Berkeley National Laboratory (Berkeley Lab) conducted a proof-of-concept NMR experiment in which a mixture of hydrocarbons and water was analyzed using a high-sensitivity magnetometer and a magnetic field comparable to that of the Earth. (lbl.gov)
  • UAB researchers publish in New Journal of Physics a formula to create a device capable of blocking any type of magnetic field. (disinfo.com)
  • The formula UAB researchers have devised is based on overlapping layers of materials with different magnetic properties, forming what is known as a metamaterial. (disinfo.com)
  • Researchers from the University of Michigan and RIKEN, a research institute in Japan, say the biological motors that nature uses for intracellular transport and other biological functions inspired them to create a whole new class of micro-devices for controlling magnetic flux quanta in superconductors that could lead to the development of a new generation of medical diagnostic tools. (innovations-report.com)
  • A similar problem exists for researchers developing better magnetic imaging tools for medical diagnostics. (innovations-report.com)
  • This would give designers the ability to remove unwanted flux trapped inside superconducting devices and enable researchers to increase the magnetic field in designated target regions inside materials, which would "magnetically focus" nearby magnetic particles. (innovations-report.com)
  • The researchers'] groundbreaking idea is to apply a current or magnetic field to the superconductor that is asymmetric in time, rather than space," said G. D'Anna of the Ecole Polytechnique Fédérale de Lausanne in Switzerland, writing in the same issue of Nature Materials. (innovations-report.com)
  • NASA researchers wish to improve our understanding of CMEs and how they move through space because they can interact with the magnetic field around Earth, affecting satellites, interfering with GPS signals, triggering auroras, and - in extreme cases - straining power grids. (clarksvilleonline.com)
  • Using recently launched satellites that can measure subtle fluctuations in Earth's magnetic field, researchers are devising a method that may help refine ocean temperature measurements and clarify how much heat the oceans are storing. (earthmagazine.org)
  • To put the recent changes into context, the researchers gathered data from sites in southern Africa and compiled a record of Earth's magnetic field strength over many centuries. (rt.com)
  • "When you burn clay at very high temperatures, you actually stabilize the magnetic minerals, and when they cool from these very high temperatures, they lock in a record of the earth's magnetic field," one of the lead researchers, John Tarduno, explained . (rt.com)
  • Working with seven awake pigeons, the researchers used a Tesla coil to cancel out the effects of Earth's magnetic field and induce an artificial one. (popsci.com)
  • Researchers said their marine laboratory experiments with a small species of shark confirm long-held speculation that sharks use magnetic fields as aids to navigation - behavior observed in other marine animals such as sea turtles. (wtop.com)
  • Researchers exposed 20 bonnetheads to magnetic conditions that simulated locations hundreds of kilometers (miles) away from where they were caught off Florida. (wtop.com)
  • Researchers say the bonnethead's reliance on Earth's magnetic field probably is shared by other species of sharks, such as great whites, that make cross-ocean journeys. (wtop.com)
  • 1. Advice on Limiting Exposure to Electromagnetic Fields (0 - 300GHz), Documents of the NRPB. (warwick.ac.uk)
  • 2. Guidelines for limiting exposure to time-varying electric, magnetic and electromagnetic fields (up to 300GHz). (warwick.ac.uk)
  • Dr. William Pawluk is an international medical expert in the medical use of electromagnetic fields (PEMFs), with over 27 years experience. (selfgrowth.com)
  • Often motivated by alleged health hazards of the stray electromagnetic fields that accompany the distribution and use of electrical power, the majority of these articles report definite effects. (pnas.org)
  • The chapters contain detailed research on the biological effects of electric and magnetic fields, and evidence for and against any interaction of electromagnetic fields (EMFs) and biological systems. (elsevier.com)
  • Sources and Characteristics of Electromagnetic Fields in the Environment, D.W. Deno and D.O. Carpenter . (elsevier.com)
  • The Influence of Electromagnetic Fields on Biologic and Model Membranes, D.V. Zhelev and D. Needham . (elsevier.com)
  • Behavioral Effects of Electromagnetic Fields in Animals, K. Salzinger . (elsevier.com)
  • But it becomes creepy when you realize our cell phones generate the same sort of electromagnetic fields that these rTMS devices do. (itbusiness.ca)
  • Electromagnetic fields from cell phones penetrate living tissue and seep into the brain. (itbusiness.ca)
  • However, proteins do not respond to external electromagnetic fields, unlike liquid crystals, which are readily reconfigured inside devices. (pnas.org)
  • Electromagnetic fields also can be technologically produced, such as radio and television waves. (cigna.com)
  • Practitioners of magnetic field therapy believe that interactions between the body, the earth, and other electromagnetic fields cause physical and emotional changes in humans. (cigna.com)
  • Killian's friend, Glauco Souza, who was then studying with the center's professors Wadih Arap and Renata Pasqualini, mentioned one day that he was developing a gel that could load cells with magnetic nanoparticles. (livescience.com)
  • Scientists and engineers have used uniform magnetic fields to drive iron-bearing nanoparticles to metal stents in injured blood vessels, where the particles deliver a drug payload that successfully prevents blockages in those vessels. (redorbit.com)
  • After injecting paclitaxel-loaded nanoparticles into the rat's arteries through a catheter, they produced a uniform magnetic field around each rat for five minutes. (redorbit.com)
  • The magnetic field, comparable to that produced by existing MRI machines, but one-tenth as strong, magnetized both the stents and the nanoparticles, and drove the particles into the stents and the nearby arterial tissue. (redorbit.com)
  • This work explores within a stochastic modeling framework a fascinating hypothesis of magnetosensitive ion channels with magnetic nanoparticles serving as sensory elements, especially, how realistic it is given a highly dissipative viscoelastic interior of living cells and typical sizes of nanoparticles possibly involved. (mdpi.com)
  • Gold nanoparticles were heated by irradiation of a radiofrequency magnetic field (RFMF), leading to denaturation of a DNA and leaves the surrounding molecules relatively unaffected. (hindawi.com)
  • Repair of physically separated thermoplastic polymers containing γ-Fe2 O3 nanoparticles without sacrificing their mechanical properties is achieved by applying an oscillating magnetic field. (nih.gov)
  • As γ-Fe2 O3 nanoparticles oscillate at the frequency of the magnetic field, localized amorphous flow occur, and a permanent repair of physically separated polymeric films is achieved. (nih.gov)
  • Fluorescence microscopic image shows clustering of micelles containing photodynamic therapy and magnetic nanoparticles when external magnetic field is applied. (newswise.com)
  • 2018. "Sensing Magnetic Fields with Magnetosensitive Ion Channels. (mdpi.com)
  • Global Magnetic Resonance Imaging (MRI) Systems Market is further estimated to grow at a CAGR of 4.02% from 2018 to reach USD 7.13 Billion by the year 2023. (openpr.com)
  • [4] One stripping mechanism is for gas to be caught in bubbles of magnetic field, which are ripped off by solar winds. (wikipedia.org)
  • [5] Calculations of the loss of carbon dioxide from the atmosphere of Mars , resulting from scavenging of ions by the solar wind, indicate that the dissipation of the magnetic field of Mars caused a near total loss of its atmosphere . (wikipedia.org)
  • The research area of "Cosmic Magnetic Fields" is dedicated to the exploration of solar, stellar, and galactic magnetic fields, along with the underlying magnetohydrodynamic (MHD) mechanisms that generate them. (aip.de)
  • The goal at AIP is to understand the complex relationship between the structure of matter and the geometry and strength of magnetic fields with particular focus on solar and stellar magnetism and their connections. (aip.de)
  • The main projects of 2010/11 were the "solar-stellar connection" with the STELLA projects, the construction of PEPSI for the LBT, the "Radio Sun" with LOFAR, the solar telescope GREGOR, with its Fabry-Perot Interferometer, as well as the verification of magnetic instabilities with the new laboratory experiment GATE. (aip.de)
  • This book addresses and reviews many of the still little understood questions related to the processes underlying planetary magnetic fields and their interaction with the solar wind. (springer.com)
  • Magnetic fields play an important role in making a planet habitable by protecting the environment from the solar wind. (springer.com)
  • And results from recent space missions to Mars and Venus strongly indicate that planetary magnetic fields play a vital role in preventing atmospheric erosion by the solar wind. (springer.com)
  • However, very little is known about the underlying interaction between the solar wind and a planet's magnetic field. (springer.com)
  • The Sun is replete with magnetic fields, with sunspots, pores and plage regions being their most prominent representatives on the solar surface. (springer.com)
  • To a large extent, their importance for the thermodynamics in the solar photosphere is determined by the total magnetic flux. (springer.com)
  • Magnetic fields in both active and quiet regions are the main coupling agent between the outer layers of the solar atmosphere, and are therefore not only involved in the structuring of these layers, but also for the transport of energy from the solar surface through the corona to the interplanetary space. (springer.com)
  • Consequently, inference of magnetic fields in the photosphere, and especially in the chromosphere, is crucial to deepen our understanding not only for solar phenomena such as chromospheric and coronal heating, flares or coronal mass ejections, but also for fundamental physical topics like dynamo theory or atomic physics. (springer.com)
  • Earth's magnetic field plays a vital role in everything from animal migration to protecting the Earth from the Sun's harsh solar wind. (forbes.com)
  • A depiction of Earth's magnetic field deflecting the Sun's solar wind. (forbes.com)
  • To look for connections between spicules and magnetic activity, solar physicist Tanmoy Samanta of Peking University in Beijing and colleagues pointed the Goode Solar Telescope , at Big Bear Solar Observatory in California, at the sun. (sciencenews.org)
  • The magnetic field energy is converted to kinetic and thermal energy," says study coauthor Hui Tian, a solar physicist also at Peking University. (sciencenews.org)
  • Life as we know it could not exist without Earth's magnetic field and its ability to deflect dangerous ionizing particles from the solar wind and more far-flung cosmic rays. (eurekalert.org)
  • Although invisible to the eye, Earth's magnetic field plays a huge role in both keeping us safe from the ever-present solar and cosmic winds while making possible the opportunity to witness incredible displays of the northern lights. (universetoday.com)
  • We can picture our magnetic domain as a huge bubble, protecting us from cosmic radiation and electrically charged atomic particles that bombard Earth in solar winds. (universetoday.com)
  • The event began with little warning when a gentle gust of solar wind delivered a bundle of magnetic fields from the Sun to Earth. (bibliotecapleyades.net)
  • Like an octopus wrapping its tentacles around a big clam, solar magnetic fields draped themselves around the magnetosphere and cracked it open. (bibliotecapleyades.net)
  • A computer model of solar wind flowing around Earth's magnetic field on June 3, 2007. (bibliotecapleyades.net)
  • that is solar wind entering Earth's magnetic field through the breach. (bibliotecapleyades.net)
  • Space physicists have long believed that holes in Earth's magnetosphere open only in response to solar magnetic fields that point south. (bibliotecapleyades.net)
  • The great breach of June 2007, however, opened in response to a solar magnetic field that pointed north. (bibliotecapleyades.net)
  • Here is why they can't believe their ears: The solar wind presses against Earth's magnetosphere almost directly above the equator where our planet's magnetic field points north. (bibliotecapleyades.net)
  • The two fields should reinforce one another, strengthening Earth's magnetic defenses and slamming the door shut on the solar wind. (bibliotecapleyades.net)
  • In the language of space physics, a north-pointing solar magnetic field is called a 'northern IMF' and it is synonymous with shields up! (bibliotecapleyades.net)
  • It is within the area of solar physics with focus on the magnetic field of the Sun. Within solar physics, the process generating the magnetic field of the Sun is normally referred to as the solar dynamo. (diva-portal.org)
  • An important tool when it comes to understanding the magnetic field of the Sun and its interactions with the whole solar system, is to construct solar dynamo models. (diva-portal.org)
  • The aim is to obtain a model, which produces output corresponding to the solar observations and which preferably also could be used to predict the solar magnetic activity. (diva-portal.org)
  • It simulates the magnetic field of the Sun for a half-sphere solution and the output can be compared to solar observations. (diva-portal.org)
  • The initial focus of the project was set on varying a specific magnetic field parameter in the code and the effects the variations would have on the solar dynamo model. (diva-portal.org)
  • Considering the main focus of the project, the differences that could be identified for varying the magnetic field parameter, were related to the field strength and locations of the different kind of solar magnetic fields. (diva-portal.org)
  • Regarding some of the flow parameters connected to the magnetic field, some conclusions could be made related to their effect on the solar dynamo. (diva-portal.org)
  • It discusses observation and modelling of magnetic fields, or processes strongly influenced by magnetism, within different environments in the Solar System. (springer.com)
  • In the Information Age , it has become increasingly important to be able to understand the Sun s magnetic activity, as it is the changes in its magnetic field that are responsible for space weather phenomena, including solar flares and coronal mass ejections. (leeds.ac.uk)
  • It's endowed with the biggest, brawniest magnetic field of any planet in the solar system, powered by a monster engine under the hood. (nasa.gov)
  • Do solar flares or magnetic storms (space weather) cause earthquakes? (usgs.gov)
  • Last year Tinseltown released The Core , a film in which the collapse of Earth's magnetic field leads to massive electrical storms, blasts of solar radiation, and birds incapable of navigation. (sott.net)
  • The Earth's magnetic field protects our planet from dangerous solar and cosmic rays, like a giant shield. (bibliotecapleyades.net)
  • The Earth produces its own magnetic field, which shields the Earth's ozone layer from the solar wind and is important in navigation using a compass. (wikipedia.org)
  • The magnetic field is strong enough near the bow shock to slow the solar wind, which induces a magnetosphere. (wikipedia.org)
  • Although Mercury's magnetic field is much weaker than Earth's magnetic field, it is still strong enough to deflect the solar wind, inducing a magnetosphere. (wikipedia.org)
  • Because Mercury's magnetic field is weak while the interplanetary magnetic field it interacts with in its orbit is relatively strong, the solar wind dynamic pressure at Mercury's orbit is also three times larger than at Earth. (wikipedia.org)
  • But these passes provided weak constraints on the magnitude of the intrinsic magnetic field, its orientation and its harmonic structure, in part because the coverage of the planetary field was poor and because of the lack of concurrent observations of the solar wind number density and velocity. (wikipedia.org)
  • The colors indicate the strength of the planet's magnetic field with red the highest value and blue the lowest. (universetoday.com)
  • Scientists believe the magnetic field is generated deep inside the Earth where the heat of the planet's solid inner core churns a liquid outer core of iron and nickel. (sott.net)
  • Glatzmaier is keeping an eye on our planet's weakening magnetic field as he tries to learn more about how Earth's geodynamo works. (sott.net)
  • Because of the planet's slow rotation, the resulting magnetic field is dominated by small-scale components that fluctuate quickly with time. (wikipedia.org)
  • Perhaps this would give the robin a more precise picture of Earth's magnetic field throughout its migration. (forbes.com)
  • But until recently, no one had come up with a good explanation of how weak magnetic fields could possibly affect living organisms. (newscientist.com)
  • When biophysicists experimented on various living cells, using steady weak magnetic fields and oscillating weak magnetic fields, they observed biological effects, such as changes in the way marine organisms called diatoms move about. (newscientist.com)
  • Are biochemical reactions affected by weak magnetic fields? (pnas.org)
  • The scientific literature is replete with studies of the influence of weak magnetic fields on biological systems. (pnas.org)
  • The situation is not helped by the scarcity of (bio)physical mechanisms by which weak magnetic fields might interact with biology. (pnas.org)
  • If Thomas has demonstrated that weak magnetic fields can have a measurable and predictable effect on the human brain, then serious questions must be raised about cell phones that produce similar fields. (itbusiness.ca)
  • Magnetic field flux density gradient 'maps' should be created by taking field strength measurements and marking lines around the source (e.g. tape or draw lines on the floor). (warwick.ac.uk)
  • [2] This field has been decaying, in the time period that measurements have been made, at a rate of about about 5% per century. (conservapedia.com)
  • Their measurements, plus theoretical models, showed that the magnetic field's strength peaked around 3,000 years ago in the middle Egypt's Iron Age. (wired.com)
  • This field turns out to be in the region of a few picoTesla but sub-picoTesla measurements are possible. (technologyreview.com)
  • The other, which I will call the empirical model, is to use the known value of the field at some set of points, as a basis for guessing what the value would be, at points where no measurements were made. (talkorigins.org)
  • Measurements of surface magnetic field noise were made at various locations over the Geneva Coal Mine near Price, Utah, on June 12, 1973. (cdc.gov)
  • The work will be featured on the cover of Angewandte Chemie and is published in a paper titled " Ultra-Low-Field NMR Relaxation and Diffusion Measurements Using an Optical Magnetometer . (lbl.gov)
  • In ex situ NMR measurements, the geometry of a typical high-field experiment is reversed such that the detector probes the sample surface, and the magnetic field is projected into the object. (lbl.gov)
  • A main challenge with this situation is generating a homogeneous magnetic field over a sufficiently large sample area: it is not feasible to generate field strengths necessary to make conventional high-resolution NMR measurements. (lbl.gov)
  • Instead of a superconducting magnet, low-field NMR measurements may rely on Earth's magnetic field, given a sufficiently sensitive magnetometer. (lbl.gov)
  • Earth's magnetic field is indeed very weak, but optical magnetometers can serve as detectors for ultra-low-field NMR measurements in the ambient field alone without any permanent magnets. (lbl.gov)
  • This means that ex-situ measurements lose chemical sensitivity due to field strength alone. (lbl.gov)
  • In contrast, relaxation and diffusion measurements in low-field NMR are more than sufficient to determine bulk materials properties. (lbl.gov)
  • In addition, metals and electronic instruments aboard the satellite could affect magnetic field measurements. (photonics.com)
  • Satellites and ground-based magnetometers are both important for making measurements of the Earth's magnetic field. (usgs.gov)
  • Currents induced in a conducting material by a time-varying magnetic field in this manner are called eddy currents. (amazonaws.com)
  • In order to divert a magnetic field with a conductive plate, it is important to be able to develop sustained eddy currents. (amazonaws.com)
  • At high frequencies it is possible for the currents induced on the shield to radiate as well as (or possibly much better than) the original source of the fields. (amazonaws.com)
  • As the liquid metal in the outer core moves, it generates electric currents, which lead to a magnetic field. (forbes.com)
  • The continual movement of liquid metal through this magnetic field creates stronger electrical currents and thus a stronger magnetic field. (forbes.com)
  • I hate to bring it up on this forum, but if there's so many magnetic fields, surely there are electric currents? (universetoday.com)
  • but if there's so many magnetic fields, surely there are electric currents? (universetoday.com)
  • There are two kinds of magnetic sources: (1) motion of electric charges, such as electric currents, and (2) the intrinsic magnetism of elementary particles , such as electrons and protons. (universetoday.com)
  • The flow of liquid iron in Earth's core creates electric currents, which in turn creates the magnetic field. (universetoday.com)
  • Acting like the spinning conductor similar to a bicycle dynamo that powers a headlight, it generates electrical currents and a constantly changing electro magnetic field. (universetoday.com)
  • Optical information processing, in which light signals replace the electric currents in conventional electronics, is a technology in development that also relies on rapidly switching magnetic fields (to control fast optical signals). (aps.org)
  • This equation denies the existence of magnetic monopoles (magnetic charges) and hence also of magnetic currents. (citizendium.org)
  • Electrical currents, externally applied to superconducting devices, induce the motion of these magnetic flux quanta. (innovations-report.com)
  • Creating maps of the Earth's magnetic field is important for geology, studies of currents in the atmosphere and oceans, climatology, and oil and mineral exploration. (photonics.com)
  • Magnetic fields surround magnetic materials and electric currents and are detected by the force they exert on other magnetic materials and moving electric charges. (phys.org)
  • All of these currents constantly replenish the magnetic field, a maintenance process that prevents it from decaying. (sott.net)
  • A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. (wikipedia.org)
  • Magnetic fields surround magnetized materials, and are created by electric currents such as those used in electromagnets, and by electric fields varying in time. (wikipedia.org)
  • Due to the weak internally generated magnetic field it is also possible that the magnetic field generated by the magnetopause currents exhibits a negative feedback on the dynamo processes, thereby causing the total field to weaken. (wikipedia.org)
  • When current flows, electrical appliances and wires generate two types of fields: electric and magnetic fields. (bfs.de)
  • The computer further performs an arithmetic processing of first-order differentiation on the waveform of the magnetic fields in a z direction (generally perpendicular to the front surface of the live body) with respect to time which is the output signals of the signal processing circuit so as to generate at least one first-order differential waveform of the magnetic fields to be displayed on the display unit. (google.de)
  • The proposal remained largely ignored particularly because of the results published soon after in [ 12 ] which showed that it was impossible to generate axisymmetric or two-dimensional magnetic fields via the homogeneous dynamo process. (hindawi.com)
  • Whereas Cowling showed that it was not possible to generate axisymmetric magnetic fields, the restriction did not apply to the nonaxisymmetric ones. (hindawi.com)
  • There are two primary methods by which one can generate a mathematical description of the Earth's magnetic field, or any other field for that matter. (talkorigins.org)
  • Can you imagine a hand held camera that can generate a picture of magnetic fields. (hackaday.com)
  • This beam sends electrons orbiting around the ring, so they generate a magnetic field in the direction of the beam. (aps.org)
  • Before 1974, it was thought that Mercury could not generate a magnetic field because of its relatively small diameter and lack of an atmosphere. (wikipedia.org)
  • There are still difficulties with this dynamo theory, including the fact that Mercury has a slow, 59-day-long rotation that could not have made it possible to generate a magnetic field. (wikipedia.org)
  • [3] As an approximation, it is represented by a field of a magnetic dipole currently tilted at an angle of about 11 degrees with respect to Earth's rotational axis , as if there were an enormous bar magnet placed at that angle through the center of the Earth. (wikipedia.org)
  • Outside the sphere, as shown below, the field is that of a magnetic dipole. (citizendium.org)
  • To this dipole field, at the end of this example, a uniform external field is added oriented along the magnetization direction. (citizendium.org)
  • In the distant past we know from evidence found in major differences in directional dipole indicators found in world-wide prehistoric lava flows, that the planetary magnetic field has completely reversed its polarity on several occasions over the last 100 million years. (sott.net)
  • It turns out that the dipole - the orderly two-pole magnetic field our compasses respond to - is under attack from within. (bibliotecapleyades.net)
  • A 1988 J.E.P. Connerney and N.F. Ness review of the Mariner magnetic data noted eight different papers in which were offered no less than fifteen different mathematical models of the magnetic field derived from spherical harmonic analysis of the two close Mariner 10 flybys, with reported centered magnetic dipole moments ranging from 136 to 350 nT-RM3 (RM is a Mercury radius of 2436 km). (wikipedia.org)
  • Whole-body time-weighted exposure to magnetic flux density (averaged over 24 hours) in should not exceed 200mT. (warwick.ac.uk)
  • This report examines possible health effects of exposure to RF fields, with an emphasis on studies conducted since the report Mobile Phones and Health external icon by the Independent Expert Group on Mobile Phones Chair Sir William Stewart (2000). (cdc.gov)
  • The exposure of the population to low- frequency fields is, therefore, usually low. (bfs.de)
  • While there are official standards for exposure to electric and magnetic fields, they are based on the amount of field needed to cause immediate harm. (amazonaws.com)
  • When interest in the potential health effects of Electric & Magnetic Fields (EMF) exposure arose, we committed to studying and addressing the issue in a socially responsible manner. (sce.com)
  • An individual's magnetic field exposure varies throughout the day and depends on multiple factors including field levels in the home, vehicle, and work place as well as appliance use. (sce.com)
  • Is there a link between exposure to magnetic fields and the risk of miscarriage? (unc.edu)
  • Exposure of mice to a magnetic field of seven Tesla per day over the total period of their embryonic development did not result in behavioural abnormalities or differences in emotional behaviour (anxiety, depression) or cognitive behaviour (working memory, long-term memory) in the young adult age. (bfs.de)
  • Table 2 Exposure to High Magnetic Fields (MFs) During Pregnancy and the Risk of Miscarriage. (nature.com)
  • Currently there is no evidence that exposure to electric fields is a health hazard (excluding electric shock). (arpansa.gov.au)
  • Whether exposure to magnetic fields is equally harmless remains a more open question. (arpansa.gov.au)
  • Some studies of exposed populations, however, have suggested there might be a weak association between prolonged exposure to higher than normal level of magnetic fields and an increased risk of childhood leukaemia. (arpansa.gov.au)
  • However, the role of cryptochrome as a magnetoreceptor remains controversial primarily because of a lack of direct experimental evidence linking magnetic field (MF) exposure to a change in neuronal activity. (nih.gov)
  • The turtles can perceive both the magnetic field's intensity and its inclination angle, the angle that the field lines make with respect to the Earth's surface, earlier research has shown. (nytimes.com)
  • Work published in Science ( abstract ) shows that individual cells seem to encode information on a magnetic field's direction, intensity and polarity. (slashdot.org)
  • These compasses are very good at finding the size of a magnetic field, but typically have to be tweaked to include a built-in local reference magnetic field so that they can also find the field's direction. (wired.com)
  • The interior layer essentially transmitted a magnetic field from one end to the other, while the other two layers acted to conceal the field's existence. (space.com)
  • The magnetic field studies will be the job of Juno's twin magnetometers, designed and built at NASA's Goddard Space Flight Center in Greenbelt, Md. They will measure the field's magnitude and direction with greater accuracy than any previous instrument, revealing it for the first time in high-definition. (nasa.gov)
  • the spacecraft measured the field's strength as 1.1% that of Earth's magnetic field. (wikipedia.org)
  • Without the geomagnetic field, for example, life on Earth as we know it would not be possible. (springer.com)
  • Many animals are able to sense the Earth's geomagnetic field to enable behaviors such as migration. (nih.gov)
  • It is proposed that the magnitude and direction of the geomagnetic field modulates the activity of cryptochrome (CRY) by influencing photochemical radical pair intermediates within the protein. (nih.gov)
  • Such "geomagnetic field reversals" occur every couple hundred thousand years, normally taking about 4,000 years to make the change. (sott.net)
  • Add a second magnetic field that oscillates at the same frequency and the particle accelerates further - an effect exploited by particle physicists in accelerators. (newscientist.com)
  • A light beam shot through a blob of rubidium atoms can directly and reliably measure the size and orientation of a magnetic field, a team of physicists reports in the Sept. 13 Physical Review A . (wired.com)
  • Physicists have worked out how to measure the magnetic fields generated by single nerves from outside the body and at room temperature. (technologyreview.com)
  • Ripped from the pages of a sci-fi novel, physicists have crafted a wormhole that tunnels a magnetic field through space. (space.com)
  • BERKELEY, Calif. - Current astronomy technology could be used to more accurately measure the Earth's magnetic field, physicists have found. (photonics.com)
  • While for low energies the asymtotic LE do not depend on initial particle position or angle with respect to the local magnetic field line, these parameters are important for higher energies. (mit.edu)
  • The team discovered that thickets of spicules frequently emerged within minutes after pockets of the local magnetic field reversed course and pointed in the opposite direction from the prevailing field in the area. (sciencenews.org)
  • If you'd rather have a light show based on the local magnetic field, try this 3D compass build we covered a while back. (hackaday.com)
  • The beam is pulsed at a rate determined by the local magnetic field to excite spin polarization of the sodium atoms, producing a fluorescence emission. (photonics.com)
  • Static Magnetic Fields-including DC electricity. (cdc.gov)
  • The Pineal Gland and Melantonin Synthesis: Their Responses to Manipulations of Static Magnetic Fields, R.J. Reiter . (elsevier.com)
  • Do strong static magnetic fields have an impact on human health? (bfs.de)
  • Individuals come in contact with strong static magnetic fields, for instance, during Magnetic Resonance Imaging, i.e. an imaging procedure used in medical diagnosis. (bfs.de)
  • While this would work for visualizing static magnetic fields, the more interesting magnetic fields around us are oscillating - think motors and transformers and such. (hackaday.com)
  • This shows that computer simulations modeling star formation must take strong magnetic fields into account. (universetoday.com)
  • The earth is a giant magnet, the soil and rocks are magnetized and there are strong magnetic fields in the atmosphere. (healthy.net)
  • Chief amongst these are incredibly strong magnetic fields. (elsevier.com)
  • An important element is to understand the physics of cooling flows (cf Edge et al 1992), since there is strong circumstantial evidence ( section 4.1.3 ) that the generation of very strong magnetic fields is connected with the cooling flow process. (caltech.edu)
  • To put this finding in context, 80 mT is about 1,000 times stronger than the Earth's magnetic field and about 100 times weaker than the strongest fields used for clinical MRI. (pnas.org)
  • Key concepts for practical electric field shielding are choosing a location that will intercept the stronger field lines and choosing a suitably conductive shield material. (amazonaws.com)
  • SAN FRANCISCO - Slag left over from Iron Age copper smelting shows the Earth's magnetic field was stronger and more variable than scientists ever imagined. (wired.com)
  • In the experiment, the compass detected magnetic fields with a strength between 0.1 gauss, which is less than the Earth's magnetic field, and 200 gauss, which is stronger than a small iron magnet. (wired.com)
  • The question, if these stronger fields affect the health of patients and medical stuff, has been investigated in three research projects commissioned by the BfS . (bfs.de)
  • By comparison, the Earth's magnetic field is some three orders of magnitude stronger. (technologyreview.com)
  • Because the magnetic effect concentrates its delivery package at the specific site of a stent, physicians could achieve stronger effects with lower overall doses of a given agent. (redorbit.com)
  • The field has weakened by about 3.5% at high latitudes over North America, while it has grown about 2% stronger over Asia. (universetoday.com)
  • You could produce stronger fields more rapidly by ditching the wire and using a laser to directly push the electrons in a plasma around a loop. (aps.org)
  • The stronger the applied field, the stronger the signal, and the higher its frequency, which also contributes to the detection sensitivity. (lbl.gov)
  • "We're getting stronger evidence that there's something unusual about the core-mantle boundary under Africa that could be having an important impact on the global magnetic field," Tarduno concluded. (rt.com)
  • But more likely than not what will happen is the original [field] will get stronger again and overwhelm the instability," Glatzmaier said. (sott.net)
  • Magnetometers can be categorized into four general types [1] depending on the magnitude of the measured field. (wikipedia.org)
  • 2 . The apparatus for measuring bio-magnetic fields as defined in claim 1 , wherein said display unit displays the output signals of said second signal processing circuit in correspondence with positions where said SQUID magnetometers are arranged. (google.de)
  • Further improvements may include three-axis magnetometers, which should allow for some spectacular visualizations similar to [Ted Yapo]'s 3D magnetic field scanner . (hackaday.com)
  • Magnetometers on Swarm satellites can measure magnetic field changes over "the whole Earth, so it would get 100 percent coverage of the ocean, and you'd have a much better estimate of the complete ocean heat content" than that provided by the Argo floats, says Tim Boyer , a scientist at NOAA's National Centers for Environmental Information who is part of the new project. (earthmagazine.org)
  • Lobsters, butterflies, and whales all follow their internal compasses along magnetic lines. (mentalfloss.com)
  • Other compasses based on lasers and atoms exist, Zibrov says, but those rely on circularly polarized light and other ways to excite the atoms, and require fancy mathematical models to reconstruct the magnetic field after the measurement has been taken. (wired.com)
  • Set of 10 compasses for tracing field lines. (3bscientific.com)
  • Effectively this means a switch in magnetic polarity and would see compasses point south instead of north. (rt.com)
  • This noninvasive technique, called repeated high-frequency transcranial magnetic stimulation (TMS), sends electric impulses to the brain. (selfgrowth.com)
  • The Thermal Noise Limit for Threshold Effects of Electric and Magnetic Fields in Biological Systems, J.C. Weaver and R.D. Astumian . (elsevier.com)
  • Effects of Magnetic and Electric Fields in Invertebrates and Lower Vertebrates, M. Kavaliers and K.P. Ossenkopp . (elsevier.com)
  • Neuroendocrine Responses to Electric and Magnetic Fields, B.W. Wilson . (elsevier.com)
  • An electric field is produced as soon as voltage is applied to an appliance or wire. (bfs.de)
  • When current flows, a magnetic field is produced in addition to the electric field . (bfs.de)
  • Thus, electrical appliances and wires, with current flowing through them, are surrounded by electric and magnetic fields. (bfs.de)
  • The electric and magnetic fields alternate direction at the same rhythm as the current. (bfs.de)
  • The strength of an electric field increases with the voltage applied to the wire. (bfs.de)
  • The unit of measurement for voltage is the volt (V). The electric field strength is expressed in volts per metre ( V/m ). (bfs.de)
  • The strength of a magnetic field around an electric wire depends on the strength of the current flowing through it. (bfs.de)
  • The electric field strengths and the magnetic flux densities of electrical household appliances and house wiring within normal working distance are usually low compared to the existing limit values. (bfs.de)
  • For some appliances higher magnetic flux densities are possible, however, in most cases the exposures are limited to small areas (such as for electric shavers, hair dryers). (bfs.de)
  • Electric and magnetic fields fall with increasing distance. (bfs.de)
  • Electric fields can be shielded easily, for example by building material. (bfs.de)
  • For static electric fields, almost any material will look like a conductor, since the free charge can slowly reposition itself. (amazonaws.com)
  • Intercepting electric field lines with a conductive shield is primarily a matter of visualizing the field lines that are potentially responsible for the unwanted coupling and positioning the shield so that it blocks these fields. (amazonaws.com)
  • Magnetic fields are generated by magnetic dipoles , moving electric charges , or changing electric fields . (conservapedia.com)
  • For instance, light is a propagating electric and magnetic wave . (conservapedia.com)
  • A magnetic force in one inertial frame of reference could correspond to an electric force, or to some combination of magnetic force and electric force, in another. (conservapedia.com)
  • Electric and magnetic fields (EMF) are invisible lines of force that are part of the natural and man-made environment. (sce.com)
  • Electric fields are created around appliances and wires wherever a voltage exists, similar to the water pressure in a hose. (sce.com)
  • Electric field strength is measured in units of volts per meter (V/m). (sce.com)
  • Are Electric and Magnetic Fields a Health Hazard? (sce.com)
  • The irradiation portion irradiates irradiation light including linearly polarized light adjusted so that the vibration direction of an electric field coincides with the axis direction of the magnetic shield onto the gaseous atoms sealed in the gas cell along a direction perpendicular to the axis of the magnetic shield. (google.de)
  • D'Arsonval in the 1700's in France discovered that pulsed electric magnetic fields stimulate the body. (healthy.net)
  • We also know the body produces electric fields. (healthy.net)
  • What this means is that when the body, which is very magnetically active, interacts with specific medically designed magnetic fields, tiny therapeutically beneficial electric charges are generated. (healthy.net)
  • Properties of these quasiparticles, including electric charge, magnetic moment and mass, depend on the symmetry of the crystal and its spatial dimension. (eurekalert.org)
  • Because of this, it was possible to create standing waves of light in the cavity, whose energy (frequency of vibrations) was different when the electric field of the wave (polarization) was directed across the molecules and different for polarization along their axis (this phenomenon is called optical anisotropy). (eurekalert.org)
  • Such quasiparticles have been observed before, but they were difficult to manipulate because the light does not react to electric or magnetic fields. (eurekalert.org)
  • Liquid crystals are viscous fluids that self-assemble into equilibrium molecular arrangements featuring anisotropic physical properties that can be easily tailored by suitable boundary conditions, and reversibly rearranged by using modest electric or magnetic fields ( 1 ). (pnas.org)
  • Rheological fluids responsive to an electric field are also known. (google.com)
  • Electric field responsive fluids and magnetic field responsive fluids include a vehicle, for instance a dielectric medium, such as mineral oil or silicone oil, and solid particles. (google.com)
  • Silica gel is frequently used in electroviscous fluids which are responsive to an electric field, as the solid which is field-responsive. (google.com)
  • The human body and the earth naturally produce electric and magnetic fields. (cigna.com)
  • Suavet and his colleagues try to apply this new data to current 'dynamo' (the British word for an electric generator, figure 2) theories trying to explain how the moon could have ever had a magnetic field of its own. (creation.com)
  • All the moon dynamo theories assume that the earth's magnetic field is produced by a dynamo, meaning that motions of the molten iron (too hot to be magnetic) in the earth's outer core would somehow act like an electric generator that produces its own magnetic field. (creation.com)
  • Without such a sustaining mechanism, electrical resistance would wear away the electric current producing the field until it was gone within a few dozen millennia. (creation.com)
  • Each photon in such a beam carries orbital angular momentum that can be delivered to electrons stripped from the atoms in the gas by the laser's strong electric field. (aps.org)
  • In the beam they modeled, the electric field lines form circles around the beam axis, and the field is most intense in a ring-shaped region. (aps.org)
  • Likewise, when the electric field is at its peak and most likely to ionize an atom, the electron has zero velocity, and is unable to contribute to a circular current. (aps.org)
  • For further information on electric and magnetic fields and the possibility of adverse health effects refer to the ARPANSA fact sheet titled Electricity and Health . (arpansa.gov.au)
  • Like any object with an electric flow, the heart generates a magnetic field. (popsci.com)
  • Recall from electric forces and fields that the divergence of an electric field at a given point is nonzero only if there is some charge density at that point. (sparknotes.com)
  • Unlike magnetic fields, electric fields never have curls. (sparknotes.com)
  • Recall that the line integral over any closed loop in an electric field is zero, implying that the field cannot "curve" around, as a field with a nonzero curl would. (sparknotes.com)
  • Electric fields have this property. (sparknotes.com)
  • The free-decay theory contradicts the evolutionary 'dynamo' theories, which claim that complex processes in the earth's core have converted heat energy into electrical energy, much like an electric generator, maintaining the field for billions of years. (icr.org)
  • In special relativity, the electric field and magnetic field are two interrelated aspects of a single object, called the electromagnetic field. (phys.org)
  • A pure electric field in one reference frame is observed as a combination of both an electric field and a magnetic field in a moving reference frame. (phys.org)
  • Similarly, an " electric field " is the space in which electric forces may be sensed--for instance between metal objects charged (+) and (-) by a battery, as in the drawing accompanying the discussion of the electron . (nasa.gov)
  • Maxwell also showed (perhaps his greatest achievement) that an "electromagnetic wave" was possible, a rapid interplay of electric and magnetic fields spreading with the velocity of light. (nasa.gov)
  • It may seem strange that empty space can be modified by electric and magnetic influences, as the field concept proposes. (nasa.gov)
  • The convection generates an electric current and, as a result, a magnetic field. (sott.net)
  • Magnetic fields are produced by moving electric charges and the intrinsic magnetic moments of elementary particles associated with a fundamental quantum property, their spin. (wikipedia.org)
  • Magnetic fields and electric fields are interrelated and are both components of the electromagnetic force, one of the four fundamental forces of nature. (wikipedia.org)
  • Rotating magnetic fields are used in both electric motors and generators. (wikipedia.org)
  • The interaction of magnetic fields in electric devices such as transformers is conceptualized and investigated as magnetic circuits. (wikipedia.org)
  • The first is the electric field, which describes the force acting on a stationary charge and gives the component of the force that is independent of motion. (wikipedia.org)
  • This animation shows the movement of the north magnetic pole at 10-year intervals from 1970 to 2020. (bibliotecapleyades.net)
  • However, 2D and 3D dynamo hydromagnetic simulations suggest that their utility as analogues of magnetic field potential is restricted. (hindawi.com)
  • Studies of cosmic magnetic fields are often classified as either (i) dealing with the origin, i.e., magneto-genesis , or (ii) dealing with growth or amplification, say, via a dynamo mechanism. (hindawi.com)
  • Research on dynamo action has a long history that goes back to the work of [ 11 ] where a homogeneous dynamo mechanism was proposed as a possible source of magnetic fields observed in the sunspots. (hindawi.com)
  • Backus [ 13 ] and Herzenberg [ 14 ] demonstrated that nonaxisymmetric fields could indeed be generated via a homogeneous dynamo. (hindawi.com)
  • Magnetic helicity arises naturually during the dynamo process, where through turbulent motions strong large-scale magnetic fields are created. (dur.ac.uk)
  • Anyhow, all lunar dynamo theories are too vague to make numerical estimates of how long the moon's field might have lasted. (creation.com)
  • Shear-driven dynamo waves at high magnetic Reynolds Number by S.M. Tobias and F. Cattaneo is published in the journal Nature on 23rd May 2013. (leeds.ac.uk)
  • Ruzmaikin et a1 1989 , Eilek 1993 ) that, at least for cooling flow clusters, large scale dynamo amplification is operating to produce such strong fields. (caltech.edu)
  • Fast dynamo amplification of magnetic fields in radio lobes ( figure 11 and section 3.2.3 ) may indicate an analogous process for magnetic field amplification in cooling flows. (caltech.edu)
  • With recent evidence for µ G-level fields in most clusters, some form of dynamo is probably also responsible, although at what stage in the cluster's history is not yet clear. (caltech.edu)
  • Thus evolutionary dynamo theories do not have a good explanation for the rapid decay of the field, whereas the free-decay theory does. (icr.org)
  • Earth's dynamo has no preference for a particular polarity, so, after an excursional period, the magnetic field, upon returning to its usual state of rough alignment with the Earth's rotational axis, could just as easily have one polarity as another. (usgs.gov)
  • The origin of the magnetic field can be explained by dynamo theory. (wikipedia.org)
  • The magnetic field itself is thought to originate from the dynamo mechanism, although this is uncertain as yet. (wikipedia.org)
  • The thermal gradient at the core-mantle boundary is subadiabatic, and hence the outer region of the liquid core is stably stratified with the dynamo operating only at depth, where a strong field is generated. (wikipedia.org)
  • if i rotate one of these magnet around one of its parallel axis, very fast , near 1000000 rpm, what happens to the magnetic field produced by the magnet? (physicsforums.com)
  • How does rotating a magnet affect the magnetic field? (physicsforums.com)
  • Conventional speakers incorporate both a permanent magnet and an AC magnetic field to produce sound. (amazonaws.com)
  • So, can I conclude that this effect was due to magnetic repulsion of the ions in the atom or is it because of other effects (like O2 attracted to magnet, etc. (physicsforums.com)
  • From a magnetic point of view, you have the magnetic field from the magnet disappearing at one end of the wormhole and appearing again at the other end of the wormhole," Prat told Live Science. (space.com)
  • For instance, magnetic resonance imaging (MRI) machines use a giant magnet and require people to be in a tightly enclosed central tube for diagnostic imaging. (space.com)
  • But if a device could funnel a magnetic field from one spot to the other, it would be possible to take pictures of the body with the strong magnet placed far away, freeing people from the claustrophobic environment of an MRI machine , Prat said. (space.com)
  • A microcontroller keeps the Hall sensor a more or less fixed distance from a rare-earth magnet, resulting in a 3D model of the magnetic field in the foam, as well as a mess of foam nubbles. (hackaday.com)
  • People who have medical devices or implants with a magnetic field, such as a pacemaker, should not use magnet therapy, because it could interfere with the function of the implant. (cigna.com)
  • Unlike a classic bar magnet, the matter governing Earth's magnetic field moves around. (universetoday.com)
  • Like a giant bar magnet , if you could sprinkle iron filings around the entire Earth, the particles would align to reveal the nested arcs of our magnetic domain. (universetoday.com)
  • Further, the sample of interest must be placed inside the magnet, such that the entire sample is exposed to a homogeneous magnetic field. (lbl.gov)
  • if a bar magnet is placed there, it will experience magnetic forces, but the field exists even when no magnet is present. (nasa.gov)
  • When molten lava erupts onto the Earth's crust and hardens, it preserves a snapshot of Earth's polarity, much in the way that iron filings on a piece of cardboard align themselves to the field of a magnet held beneath it. (sott.net)
  • A permanent magnet′s magnetic field pulls on ferromagnetic materials such as iron, and attracts or repels other magnets. (wikipedia.org)
  • Killian uses magnetic fields to trap and manipulate atoms that have been cooled to near absolute zero. (livescience.com)
  • The gas cell, in which gaseous atoms are sealed, is disposed in a hollow area of the magnetic shield. (google.de)
  • In the presence of a magnetic field, the atoms' orientation changed in a particular way, and this change was detectable in the light that came through the atom cloud, the team found. (wired.com)
  • These guys have built a sensor that uses a laser beam to detect the effect of a magnetic field on gaseous caesium atoms, which polarize light when they are magnetized. (technologyreview.com)
  • They found that the same sodium atoms in the atmosphere used in laser guide stars - artificial stars used as a reference point to adjust telescope optics to remove atmospheric disturbances - could be employed to measure the Earth's magnetic field. (photonics.com)
  • The beam from the laser, which is small enough to load onto a truck or boat, is used to measure the rotation frequency of the sodium atoms, which are used as sensors to measure the strength of the Earth's magnetic field. (photonics.com)
  • Current is expressed in amperes (A), the strength of the magnetic field in amperes per metre ( A/m ). (bfs.de)
  • But a new study of ancient copper mines in southern Israel found that the strength of the magnetic field could double and then fall back down in less than 20 years. (wired.com)
  • To measure the strength of the magnetic field, Shaar and colleagues turned to piles of waste metal left near an ancient Egyptian copper mine. (wired.com)
  • As we vary the strength of the magnetic field, we can alter the progress of these photochemical reactions inside the protein," said lead researcher Peter Hore, who will present his work during a talk at the American Physical Society's March Meeting on Wednesday, March 4 in San Antonio, Texas . (eurekalert.org)
  • This is detected by a ground-based telescope and analyzed to determine the strength of the magnetic field. (photonics.com)
  • At the Hermean equator, the relative strength of the magnetic field is around 300 nT, which is weaker than that of Jupiter's moon Ganymede. (wikipedia.org)
  • [11] Although the magnetic declination does shift with time, this wandering is slow enough that a simple compass can remain useful for navigation. (wikipedia.org)
  • See Magnetic Declination [wikipedia.org]. (slashdot.org)
  • The magnetic field of Earth is directional nearly north-to-south, although slightly askance, meaning that "magnetic north" is not the same as "true north," and a person who is orienteering must take into account this change of declination, although it is truly only marginally relevant, unless you are close to either pole. (conservapedia.com)
  • The frequency at which the particle circulates, the so-called cyclotron resonance frequency, depends on the mass and charge of the particle and on the strength of the field. (newscientist.com)
  • It seemed that the cyclotron resonance frequency of calcium could be the link between magnetic fields and cells in living creatures, including humans. (newscientist.com)
  • A particularly beautiful aspect of magnetic resonance is its ability to gently peer within intact objects, but it's tough to do that from far away. (lbl.gov)
  • The problem with its use in inductively-detected MRI [MRI - magnetic resonance imaging - is NMR's technological sibling] is that you need a magnetic field that's both strong and homogeneous, so you need to surround the whole subject with superconducting coils, which is not something that's possible in an application like oil-well logging. (lbl.gov)
  • Sensitivity of magnetic resonance depends profoundly on the magnetic field, because the field causes the detected spins to align slightly," adds Bajaj. (lbl.gov)
  • In high-field NMR, the chemical properties of a sample are determined from their resonance spectrum, but this is not possible without either extremely high fields or extremely long-lived coherent signals (neither of which are possible with permanent magnets). (lbl.gov)
  • The "Magnetic Field Sensors" group is working on superconducting sensors (SQUIDs) for biology, on low field nuclear magnetic resonance, on magnetic nanoparticle sensing and on microwave resonator techniques. (fz-juelich.de)
  • Global Magnetic Resonance Imaging (MRI) Systems Market was valued at USD 5.63 Billion in the year 2017. (openpr.com)
  • The Global Magnetic Resonance Imaging (MRI) Systems Market is segmented as By Field Strength, Architecture, and Region. (openpr.com)
  • If a free charged particle moves in a constant magnetic field, it accelerates so that its path bends into a circle. (newscientist.com)
  • As the force always acts perpendicular to the velocity, a charged particle in a uniform (constant) magnetic field will undergo circular motion . (conservapedia.com)
  • We find that in the pure sine field, the particle energy experiences subdiffusion throughout all the time scales. (mit.edu)
  • We use the fact that the magnetic field induces transitions, converting one particle into another," says Navarra. (elsevier.com)
  • The magnetic field vector B at any point can be defined as the vector that, when used in the Lorentz force law, correctly predicts the force on a charged particle at that point. (wikipedia.org)
  • The vector B is defined as the vector field necessary to make the Lorentz force law correctly describe the motion of a charged particle. (wikipedia.org)
  • To measure the earth field larger than the geomagnetic noise(around 0.1 nT), better sensors are required. (wikipedia.org)
  • For the application of magnetic anomaly detection , sensors at different locations have to be used to cancel the spatial-correlated noise in order to achieve a better spatial resolution . (wikipedia.org)
  • To measure the field below the geomagnetic noise, much more sensitive magnetic field sensors have to be employed. (wikipedia.org)
  • A MEMS-based magnetic field sensor is small, so it can be placed close to the measurement location and thereby achieve higher spatial resolution than other magnetic field sensors. (wikipedia.org)
  • electron microscopes industrial Microscopy monitoring magnetic field cancellation system New Products Sensors & Detectors Technical Manufacturing Corp. (photonics.com)
  • Their proposed solid-state devices could be used in specific technological applications, including the removal of unwanted fluctuating vortices inside the most sensitive magnetic field sensors used for medical imaging, and to sculpt the magnetic flux profile inside superconducting materials as needed for specific applications. (innovations-report.com)
  • Computer simulation of the Earth 's field in a period of normal polarity between reversals. (wikipedia.org)
  • Is it true that Earth's magnetic field occasionally reverses its polarity? (usgs.gov)
  • We can see evidence of magnetic polarity reversals by examining the geologic record. (usgs.gov)
  • The magnitude of the Earth's magnetic field at its surface ranges from 25 to 65 μT (0.25 to 0.65 gauss ). (wikipedia.org)
  • The magnetic fields tended to line up in the same direction, even though the relative size scales (1 light-year-sized cores versus 1000 light-year-sized nebulas) and densities were different by orders of magnitude. (universetoday.com)
  • Then Wu and Dickman turned up the magnetic field, adjusting its magnitude, elevation and other variables. (popsci.com)
  • However, when Mariner 10 made a fly-by of Mercury (somewhere around April 1974), it detected a magnetic field that was about 1/100th the total magnitude of Earth's magnetic field. (wikipedia.org)
  • [1] The lines represent magnetic field lines, blue when the field points towards the center and yellow when away. (wikipedia.org)
  • Because there are no free magnetic charges, it is not possible to terminate lines of magnetic flux on a shield. (amazonaws.com)
  • Now, understanding that magnetic shielding "works" because it is a better "conductor" of magnetic field lines than air or just about any other material, let's see what happens with 2 different shield designs. (amazonaws.com)
  • In the cross section image at right, we see that the magnetic field lines that would have occurred at the radius of the shield will exist INSIDE the shield. (amazonaws.com)
  • It is known that the cross-product of gradients of two the potentials may represent magnetic fields lines. (hindawi.com)
  • Baby eels have joined the ever-growing club of animals that live their lives along magnetic lines. (mentalfloss.com)
  • They consistently turned their bodies to run parallel with magnetic lines, but the direction of those lines varied depending on the phase of the tides. (mentalfloss.com)
  • The sine field is an example of a force-free, helical magnetic field, whose field lines are chaotic over the entire space. (mit.edu)
  • In this thesis, we examine the transport properties of magnetic field lines and particles in three related systems: the sine field, the sine field superimposed with a constant background field, and a time varying sine field. (mit.edu)
  • The bright spots represent methanol masers - natural lasers that are common in the dense environments where massive stars form - and the curved lines represent the magnetic field. (mynewsdesk.com)
  • Normally, magnetic field lines radiate out from a certain location and decay over time, but the presence of the magnetic field should be detectable from points all around it. (space.com)
  • Illustration of the invisible magnetic field lines generated by the Earth. (universetoday.com)
  • Solid black lines trace the outer boundaries of Earth's magnetic field. (bibliotecapleyades.net)
  • Around 2% had fields greater than 0.4 µT (4 mG) and these were mainly due to close proximity (less than 50 metres) to high voltage transmission lines. (arpansa.gov.au)
  • because B is solenoidal, field lines are closed. (citizendium.org)
  • Point charges cause divergence, as they are a "source" of field lines. (sparknotes.com)
  • Here the goal is to control the motion of magnetic field lines within the superconducting material, so that their motion does not produce noise that degrades the performance of the diagnostic device. (innovations-report.com)
  • An illustration of Earth's fluctuating magnetic field lines. (earthmagazine.org)
  • 250 g of iron filings for displaying magnetic field lines. (3bscientific.com)
  • Use this plastic bottle to scatter iron filings that make magnetic lines of force visible. (3bscientific.com)
  • Magnetic field lines similarly describe the structure of magnetic fields in three dimensions.They are defined as follows. (nasa.gov)
  • Field lines converge where the magnetic force is strong , and spread out where it is weak. (nasa.gov)
  • The behavior of field lines in the Earth's magnetic field is very similar. (nasa.gov)
  • Magnetic field lines were introduced by Michael Faraday (1791-1867) who named them "lines of force. (nasa.gov)
  • Most scientists nowadays view field lines as intangible abstractions, useful only for describing magnetic fields. (nasa.gov)
  • Faraday, however, felt that they represented more, that space containing magnetic "lines of force" was no longer empty but acquired certain physical properties. (nasa.gov)
  • Typically each newly generated field lines up in the direction of the existing magnetic field. (sott.net)
  • As a result of the north-south asymmetry in Mercury's internal magnetic field, the geometry of magnetic field lines is different in Mercury's north and south polar regions. (wikipedia.org)
  • In particular, the magnetic "polar cap" where field lines are open to the interplanetary medium is much larger near the south pole. (wikipedia.org)
  • He added that the same concepts may be applicable for restoring salmon and other fish to rivers because many birds and fish also use magnetic fields for navigation. (nytimes.com)
  • Individual neurons in birds' brains can relay crucial information about Earth's magnetic field , possibly providing the animals with an 'internal GPS. (slashdot.org)
  • Detection of and Receptors for Magnetic Fields in Birds, R.C. Beason and P. Semm . (elsevier.com)
  • SOME birds, especially those that migrate at night, use the Earth's magnetic field to find their way. (newscientist.com)
  • Now, a recent study finally sheds light on how some birds visually see Earth's magnetic field. (forbes.com)
  • Birds use Earth's magnetic field as sort of a heads-up display to help them navigate the globe. (forbes.com)
  • While scientists have known for quite some time that birds can see Earth's magnetic field, it was unclear exactly how birds are able to visualize the magnetic field. (forbes.com)
  • In the two bird species above, it appears that the presence of cryptochromes, specifically the Cry4 protein, is responsible for the ability of birds to visually detect Earth's magnetic field. (forbes.com)
  • Representation of how birds may visually see Earth's magnetic field. (forbes.com)
  • While the exact way birds visualize Earth's magnetic field is part of further investigation, scientists believe the Cry4 protein acts as sort of a filter over the bird's vision. (forbes.com)
  • Scientists at the University of Illinois at Urbana-Champaign believe birds see Earth's magnetic field through a filter similar to the figure above. (forbes.com)
  • Behavioral experiments have shown that even subtle disruptions to the magnetic field can impact birds' ability to navigate. (eurekalert.org)
  • Our feeling is that this is likely to provide key insights into the mechanism either of the magnetic compass sense or of some important process that interferes with the birds' orientation behavior," said Hore. (eurekalert.org)
  • Neurons in the brains of pigeons encode the direction of Earth's magnetic field, endowing the birds with an innate internal GPS system , according to a new study. (popsci.com)
  • Scientists have long known internal magnetic field receptors exist in many animals - from birds to foxes and possibly even people - but this is the first time someone has tried to explain the brain wiring that can actually use these receptors and provide a sense of direction. (popsci.com)
  • Tendrils of plasma near the surface of the sun emerge from realignments of magnetic fields and pump heat into the corona , the sun's tenuous outer atmosphere, a study suggests. (sciencenews.org)
  • Spicules undulate like a wind-whipped field of wheat in the chromosphere, the layer of hot gas atop the sun's surface. (sciencenews.org)
  • Astronomers have long debated how spicules form - with the sun's turbulent magnetic field being a prime suspect - and whether they can help explain why the corona is a few hundred times as hot as the sun's surface ( SN: 8/20/17 ). (sciencenews.org)
  • [9] The field also magnetizes the crust, and magnetic anomalies can be used to search for deposits of metal ores . (wikipedia.org)
  • A typical procedure for measuring its direction is to use a compass to determine the direction of magnetic North. (wikipedia.org)
  • You can't "mark" a location using magnetic sense - because all a compass gives you is a direction, not a position. (slashdot.org)
  • This comparison of the external field to an internal reference allows the compass to reconstruct the magnetic field, but the quality of the data can vary greatly, says study co-author Alexander Zibrov of Harvard University. (wired.com)
  • Zibrov and his colleagues wanted to create a compass that could directly pinpoint the direction and the size of a magnetic field. (wired.com)
  • But before the optical compass appears strapped to Scouts' belts, the lab prototype must be tested in the field. (wired.com)
  • The same field makes your compass needle align north to south. (universetoday.com)
  • If at any point on such a line we place an ideal compass needle, free to turn in any direction (unlike the usual compass needle, which stays horizontal--such needles exist, see bottom of page) then the needle will always point along the field line (drawing below). (nasa.gov)
  • Satellites and instruments on the ground keep a constant watch over this bubble of magnetic energy surrounding our planet. (universetoday.com)
  • The three Swarm satellites precisely identify and measure precisely these different magnetic signals. (universetoday.com)
  • At this week's Living Planet Symposium in Prague, Czech Republic, new results from the constellation of Swarm satellites show where our protective field is weakening and strengthening, and how fast these changes are taking place. (universetoday.com)
  • In 2013, the European Space Agency (ESA) launched a constellation of three satellites - collectively called Swarm - to measure shifts in Earth's magnetic field. (earthmagazine.org)
  • So, the more fluctuations in the magnetic field the Swarm satellites detect, the more conductive - and, thus, warmer - the moving water is. (earthmagazine.org)
  • But, he notes, the "research will likely remain of interest because of the magnetic survey being conducted by the Swarm satellites. (earthmagazine.org)
  • The field is now so weak that it's hazardous for satellites to enter that region. (rt.com)
  • A group of scientists from the University of California has discovered a more effective way to measure the Earth's magnetic field using ground-based lasers rather than satellites. (photonics.com)
  • Satellites used currently to measure the Earth's magnetic field are moving at high speeds, so it is not always possible to tell whether fluctuations are actual or a result of the spacecraft's movement to a new location. (photonics.com)
  • Already, changes within the Earth have weakened the field over the South Atlantic so much that satellites exposed to the resulting radiation have experienced memory failure. (bibliotecapleyades.net)
  • Loggerhead turtles are known to use the earth's magnetic fields to nest on Florida's Gulf beaches within about 40 to 50 miles of where they were born decades earlier. (nytimes.com)
  • Sea turtles use the earth's magnetic fields to navigate back to the area where they were born decades earlier, according to a new study that used loggerhead genetics to investigate their travels. (nytimes.com)
  • The variation in earth's magnetic field around the nesting area seems to really predict genetic differentiation much better than geographic distance. (nytimes.com)
  • The magnetosphere is the region above the ionosphere that is defined by the extent of the Earth's magnetic field in space. (wikipedia.org)
  • Using magnetoreception various other organisms, ranging from some types of bacteria to pigeons, use the Earth's magnetic field for orientation and navigation. (wikipedia.org)
  • At any location, the Earth's magnetic field can be represented by a three-dimensional vector. (wikipedia.org)
  • There are audio recordings of the rapid changes in the Earth's magnetic field at points on the ground. (slashdot.org)
  • He found that the phosphorylation of myosin, a muscle protein, which depends on the binding of calcium in calmodulin, was several times as great in the presence of a steady field equal in strength to the Earth's magnetic field, together with an alternating field of the same strength. (newscientist.com)
  • Earth's magnetic field is important to us," the professor told those in attendance at the meeting. (redorbit.com)
  • We are developing techniques and we believe we can actually record the Earth's magnetic field in these minerals also. (redorbit.com)
  • [4] The strength of the earth's magnetic field is according to the strength of the sun 's magnetic field. (conservapedia.com)
  • One group that makes use of the Bible as a resource for science suggests that the history of the Earth's magnetic field is as depicted here. (conservapedia.com)
  • K.L. McDonald and R.H. Gunst, 'An analysis of the earth's magnetic field from 1835 to 1965,' ESSA Technical Report, IER 46-IES 1, U.S. Govt. (conservapedia.com)
  • A natural source is the earth's magnetic field. (sce.com)
  • The Earth's magnetic field is a result of the movement or convection of liquid iron in the outer core. (forbes.com)
  • The ability to see Earth's magnetic field, known as magnetoreception, relies on the presence of specifically the blue wavelength of light . (forbes.com)
  • The complex process involves "radical" intermediate molecules which are sensitive to Earth's magnetic field. (forbes.com)
  • The Earth's magnetic field, as it relates to the direction the bird is facing, could alter the intermediate radical molecules differently, giving the bird a sense for where it is facing in relation to the Earth's magnetic field. (forbes.com)
  • The Earth's magnetic field comes from the movement of molten iron in the core. (wired.com)
  • But paleomagnetists (scientists who study the history of the Earth's magnetic field) thought the changes were usually small and slow, fluctuating by about 16 percent over the course of a century. (wired.com)
  • When melted iron cools rapidly, it freezes with a signature of the Earth's magnetic field at that instant. (wired.com)
  • Investigative reporter Linda Moulton Howe discussed the strange disappearance of livestock, the discovery of a mysterious pattern of six rings, and how Earth's magnetic field is weakening. (coasttocoastam.com)
  • For her fourth report, she talked with geophysicist John Tarduno, Ph.D., from the University of Rochester, about how Earth's magnetic field has been weakening at an increasing rate over the last 160 years. (coasttocoastam.com)
  • In this book, Barnes advances the argument that the observed exponential decay of the Earth's magnetic field proves that the Earth cannot be more than about 10,000 years old. (talkorigins.org)
  • This mathematical tool was invented by the ubiquitous German mathematician, Carl Freidrich Gauss, circa 1835, for the purpose of evaluating the Earth's magnetic field. (talkorigins.org)
  • In fact, it can detect a field as weak as 70 femtoteslas - about a billionth of the Earth's magnetic field. (thaindian.com)
  • Is Earth's Magnetic Field Ready to Flip? (universetoday.com)
  • Earth's magnetic field is thought to be generated by an ocean of super-heated, swirling liquid iron that makes up its the outer core 1,860 miles (3000 kilometers) under our feet. (universetoday.com)
  • The European Space Agency's Swarm satellite trio , launched at the end of 2013, has been busy measuring and untangling the different magnetic signals from Earth's core, mantle, crust, oceans, ionosphere (upper atmosphere where the aurora occurs) and magnetosphere , the name given to the region of space dominated by Earth's magnetic field. (universetoday.com)
  • Based on results from ESA's Swarm mission, the animation shows how the strength of Earth's magnetic field has changed between 1999 and mid-2016. (universetoday.com)
  • The animation shows changes in the rate at which Earth's magnetic field strengthened and weakened between 2000 and 2015. (universetoday.com)
  • NASA 's five THEMIS spacecraft have discovered a breach in Earth's magnetic field ten times larger than anything previously thought to exist. (bibliotecapleyades.net)
  • Earth's magnetic field, a familiar directional indicator over long distances, is routinely probed in applications ranging from geology to archaeology. (lbl.gov)
  • One nice thing about Earth's magnetic field is that it's very homogeneous," explains Ganssle. (lbl.gov)
  • Earth's Magnetic Field - A Hazard For Lunar Astronauts? (innovations-report.com)
  • Trapped by Earth's magnetic field into two giant belts around the planet, high-energy particles in the region can batter the spacecraft and even interfere with onboard electronics. (clarksvilleonline.com)
  • Movement of seawater, like the back and forth motion of the tides, can cause fluctuations in Earth's magnetic field because seawater conducts electricity. (earthmagazine.org)
  • The earth's magnetic field is a powerful witness for a world much younger than the billions of years required by evolutionary theories. (icr.org)
  • The average 'intensity' of the earth's magnetic field has decreased exponentially by about 7% since its first careful measurement in 1829. (icr.org)
  • Iron oxides in those objects retain a record of the strength and direction of the earth's magnetic field at the time they last cooled to normal temperatures. (icr.org)
  • Archaeomagnetic data taken worldwide show that the intensity of the earth's magnetic field was about 40% greater in 1000 A.D. than it is today, and that it has declined steadily since then. (icr.org)
  • Paleomagnetic data show that while the geologic strata were being laid down, the earth's magnetic field reversed its direction hundreds of times. (icr.org)
  • To measure the Earth's magnetic field, an orange laser beam is directed at a layer of sodium 90 km above the Earth. (photonics.com)
  • Does the Earth's magnetic field affect human health? (usgs.gov)
  • The Earth's magnetic field does not directly affect human health. (usgs.gov)
  • The last time Earth's magnetic field flipped was about 780,000 years ago. (sott.net)
  • This process can lead to a net weakening of Earth's magnetic field. (sott.net)
  • Earth's magnetic field would collapse and then, maybe, flip. (sott.net)
  • Just north of a truck stop along Interstate 80 in Battle Mountain, Nevada, lies evidence that the Earth's magnetic field once went haywire. (sott.net)
  • A magnetic field measurement apparatus includes an irradiation portion, a gas cell, a measurement unit (polarization separation unit, light receiving portion, signal processing circuit), and a magnetic shield. (google.de)
  • Such measurement is of great significance since we believe that the magnetic field produced in these collisions is the strongest one in the Universe. (elsevier.com)
  • The actual strength of the field at a given location depends upon the type of electrical sources and their distance from the location of measurement. (arpansa.gov.au)
  • Applying a steady magnetic field causes the plane of vibration to rotate, or precess, about the direction of the magnetic field at a frequency that is exactly one-half of the cyclotron frequency of the bound ion. (newscientist.com)
  • As the frequency of 50 hertz is at the low- frequency end of the electromagnetic spectrum, these fields are referred to as "low-frequency" fields. (bfs.de)
  • High- frequency fields, by contrast, have a frequency ranging from 100 kilohertz to many millions of hertz. (bfs.de)
  • Magnetic field distortion is reduced through the use of a low frequency magnetic field. (google.ca)
  • The team's simulations indicate that a combination of an 11.3-microjoule main laser pulse and a 1.9-microjoule frequency-doubled pulse can turn on an 8-tesla field in 50 femtoseconds. (aps.org)
  • ARPANSA has conducted a survey of power frequency magnetic fields in approximately 300 randomly selected homes in metropolitan Melbourne. (arpansa.gov.au)
  • The magnetic flux density B is usually seen as the fundamental magnetic field, see the article about B for more details about magnetism. (citizendium.org)
  • So Suavet's 0.16 Ga extension of the duration of high magnetic fields on the moon would actually only represent, at most, a very short period of time, during, or not long after, Creation Week. (creation.com)
  • We demonstrate a reversible and biocompatible experimental protocol to align an active liquid crystal with a uniform magnetic field, allowing the transition between turbulent and laminar flow regimes. (pnas.org)
  • By using well-established protocols for the orientation of liquid crystals with a uniform magnetic field, and through the mediation of anisotropic shear stresses, the active nematic reversibly self-assembles with aligned flows and textures that feature orientational order at the millimeter scale. (pnas.org)
  • A somewhat more common manifestation of the RPM is the sensitivity of radical pair reactions to external magnetic fields ( 8 , 10 ). (pnas.org)
  • Second, everything cloaked by the antimagnet will be protected from external magnetic fields and the object inside will be undetectable. (disinfo.com)
  • The dynamical evolution and turbulent decay of magnetic fields is shown for various knotted and linked magnetic structures. (dur.ac.uk)
  • The rocks came from a basalt field (most of the southwest part of Mare Tranquilitatis) that previous studies dated (by nuclear decay techniques) as having erupted about 3.56 Ga ago. (creation.com)
  • Let's start the story with the most prominent feature of the field today--its very rapid decay. (icr.org)
  • 2] He pointed out that such a decay would occur very naturally if the electrical current producing the field were slowly losing energy because of the electrical resistance of the core. (icr.org)
  • Such a rapid decay could not have been going on continuously for millions of years, because the field would have to have been impossibly strong in the past in order for it to still exist today. (icr.org)
  • Creationists of the 1970s extrapolated today's decay back into the past, showing that the field could not be more than about 10,000 years old, assuming a constant decay of intensity. (icr.org)
  • Personal devices might be a possible future, but repetitive transcranial magnetic stimulation (rTMS) treatment is a reality in Canada today. (itbusiness.ca)
  • He thought Gina would be a good candidate for a treatment called transcranial magnetic stimulation, or TMS. (clickondetroit.com)
  • [1] The cross product means that the force will always act at a right angle to both the field and the velocity and if the velocity is parallel to the field, no force will act. (conservapedia.com)
  • where θ is the angle between the velocity and magnetic field. (conservapedia.com)
  • A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field. (wikipedia.org)
  • Blue or green light triggers electrons in the protein to produce pairs of radicals whose electron spins respond to magnetic fields. (eurekalert.org)
  • Early ideas on the amplification of magnetic fields in galaxy clusters came from attempts to explain what is probably a closely coupled phenomenon - namely the re-acceleration of ICM relativistic electrons. (caltech.edu)
  • Jaffe (1980) proposed that turbulent wakes behind galaxies moving through the ICM would re-accelerate relativistic electrons, and maintain the magnetic field at µ G levels. (caltech.edu)
  • Magnetic fields penetrate superconducting materials via lattices of quantized magnetic flux, called vortices because electrons whirl around them without dissipating energy. (innovations-report.com)
  • In addition, a magnetic field that varies with location will exert a force on a range of non-magnetic materials by affecting the motion of their outer atomic electrons. (wikipedia.org)
  • Some time before experimenting with MRI machines and building his own CT scanner, [Peter Jansen] wanted to visualize magnetic fields. (hackaday.com)
  • One of his small side projects is building tricoders - pocket sensor suites that image everything - and after playing around with the magnetometer function on his Roddenberry-endorsed tool, he decided he had to have a way to visualize magnetic fields. (hackaday.com)
  • Carving foam isn't the only way to visualize a magnetic field in three dimensions, of course. (hackaday.com)
  • A magnetic field is a vector field responsible for generating forces on electrically charged objects and magnets. (conservapedia.com)
  • it is a vector field . (citizendium.org)
  • The magnetic field H is closely related to the magnetic induction B (also a vector field). (citizendium.org)
  • Speaking physically, the divergence of a vector field at a given point measures whether there is a net flow toward or away the point. (sparknotes.com)
  • It is often useful to make the analogy comparing a vector field to a moving body of water. (sparknotes.com)
  • However, when the divergence of a vector field is zero, this equation tells us that the integral through any surface in the field must also be zero. (sparknotes.com)
  • The curl, unlike the divergence, is itself a vector field, defined by a single vector at each point. (sparknotes.com)
  • Physically speaking, curl measures the rotational motion of a vector field. (sparknotes.com)
  • as such it is a vector field. (phys.org)
  • The question has always been: Even if sharks are sensitive to magnetic orientation, do they use this sense to navigate in the oceans, and how? (wtop.com)
  • Studies of cosmic magnetic fields have a long history and are driven by the need to explain what is observed and the desire to know what role magnetic fields play in the formation and evolution of cosmic structures ranging from stars and galaxies to superclusters and even the universe. (hindawi.com)
  • They arrive at the conclusion that cosmic magnetic fields generated before recombination had to have larger than the horizon coherence cell in order to survive recombination epoch or cosmic magnetic fields only emerging after recombination era. (hindawi.com)
  • The existence of stellar and planetary magnetic fields is a decisive factor for the formation and evolution of life on planets, as magnetic fields are shields against high-energy cosmic radiation. (aip.de)
  • That's important because, at least in theory, it allows them to detect the fields associated with nerves at a distance of several millimeters. (technologyreview.com)
  • However, until now, these clinical devices have never worked at the quantum limit and so have not been sensitive enough to detect the fields from individual nerve fibers. (technologyreview.com)
  • The portable magnetometer, invented by scientists at the University of Leeds, England, measures minute fluctuations in the heart's magnetic field so sensitively that it can detect heart problems in fetuses, as well as spot problems in adult hearts far earlier than an ultrasound or ECG. (popsci.com)
  • Previously, dynamos for large, highly conducting bodies such as the Sun would be overwhelmed by small-scale fluctuations in the magnetic field. (leeds.ac.uk)
  • Pacemaker interference is unlikely to occur if wearers are not exposed to static magnetic flux densities greater than 0.5mT over the region of the trunk. (warwick.ac.uk)
  • In 1986 I suggested that strong flows of the fluid in the earth's core could produce rapid reversals of the field during and after the Genesis flood. (icr.org)
  • As outlined, the hyperfine interaction of the magnetic 25 Mg isotope in a radical pair comprised of a Mg + ion and an ADP radical is thought to flip the electron spin of the former, opening up a reaction pathway that would otherwise be insignificant and favoring the catalytic reaction over the unproductive back reaction. (pnas.org)
  • Although there seems to have been no previous suggestion that the +1 oxidation state of Mg can mediate ATP production and scant evidence that Mg has any biologically relevant redox chemistry, the general idea that magnetic nuclei and applied magnetic fields can alter the coherent spin dynamics of radical pairs and therefore affect reaction rates and product yields is beyond doubt ( 8 ). (pnas.org)
  • As the properties of the cavity were modified by an external voltage, the photons behaved like massive quasiparticles endowed with a magnetic moment, called "spin", under the influence of an artificial magnetic field. (eurekalert.org)
  • A MEMS magnetic field sensor is a small-scale microelectromechanical systems (MEMS) device for detecting and measuring magnetic fields ( Magnetometer ). (wikipedia.org)
  • From left) Alex Pines, Dmitry Budker and Scott Seltzer led a proof-of-concept NMR experiment using a high-sensitivity magnetometer and a magnetic field comparable to that of the Earth. (lbl.gov)
  • Paul Ganssle is the corresponding author of a paper in Angewandte Chemie describing ultra-low-field NMR using an optical magnetometer. (lbl.gov)
  • Since the invention of the magnetometer in the 1830s, the average intensity of the magnetic field at the Earth's surface has decreased by about ten percent. (usgs.gov)
  • The study of the past magnetic field of the Earth is known as paleomagnetism. (wikipedia.org)
  • If the targeted B-field is larger than the earth magnetic field (maximum value around 60 µT), the sensor does not need to be very sensitive. (wikipedia.org)
  • What is more, these frequencies seem to depend on the presence of a steady background magnetic field such as that of the Earth. (newscientist.com)
  • Scientists have uncovered evidence contained within South African rocks which shows that a weak magnetic field was present on Earth nearly 3.5 billion years ago. (redorbit.com)
  • If, even with this magnetic field, we are losing hydrogen and water, that would suggest the palaeo-Earth in its infant state must have had more water than we think about today. (redorbit.com)
  • This model suggests the magnetic field of the Earth must be less than 10,000 years old. (conservapedia.com)
  • There's no way to know if similar magnetic wormholes lurk in space , but the technology could have applications on Earth, Prat said. (space.com)
  • In practice, the magnetic field is measured constantly at a number of official magnetic observatories all over the world, as well as at universities, or by other scientific teams and expeditions, and now several spacecraft measure the field well above the Earth, and out into deep space. (talkorigins.org)
  • These data are then fed into computer programs which use spherical harmonics to create a model for the field everywhere on the Earth. (talkorigins.org)
  • in the magnetic field of the Earth, which naturally led to supposition that they can serve as sensory elements in various animals. (mdpi.com)
  • How does Earth sustain its magnetic field? (eurekalert.org)
  • within minutes they overlapped over Earth's equator to create the biggest magnetic breach ever recorded by Earth-orbiting spacecraft. (bibliotecapleyades.net)
  • For four days every month the Moon passes through the magnetic field of the Earth and parts of the lunar surface are charged with static electricity. (innovations-report.com)
  • By estimating the field intensity everywhere (in, on, and above the earth), we can calculate the total electrical 'energy' stored in the field. (icr.org)
  • The rotation of the Earth also generates forces that curve the flow of fluid as it rises, twisting the magnetic field. (sott.net)
  • The field has reversed many times in the past, and life didn't stop," said Gary Glatzmaier, an earth scientist and magnetic field expert at the University of California, Santa Cruz. (sott.net)
  • They have figured out how to peer deep inside the Earth, to the edge of the molten, metallic core where the magnetic field is continually being generated. (bibliotecapleyades.net)
  • where 1 is the 3×3 unit matrix , χ the magnetic susceptibility tensor of the magnetizable medium, and μ 0 the magnetic permeability of the vacuum (also known as magnetic constant ). (citizendium.org)
  • with the relative magnetic permeability μ r = 1 + χ m . (citizendium.org)
  • In essence, the weak magnetic pulses act like a maestro to the brain's neurons. (itbusiness.ca)
  • While the biology of the treatment isn't completely understood, it's thought that the magnetic pulses might activate regions of the brain that have decreased activity in people with depression. (clickondetroit.com)
  • Simulations suggest that a relatively simple laser technique could produce femtosecond magnetic-field pulses, which currently are only available at a few major lab facilities. (aps.org)
  • Magnetic field has different strength in different area so you could (assuming no major changes have occurred) approximate distance from the polar region in addition to knowing the direction. (slashdot.org)
  • They presumably sense the north-south direction of the field and use that as a reference to find the direction they need to fly. (newscientist.com)
  • By repeatedly pushing slowly in one direction, and fast in the opposite direction, they force magnetic flux quanta to move from one point to another inside materials. (innovations-report.com)
  • But every now and again, some force will cause the new field to line up in the opposite direction. (sott.net)
  • Since both strength and direction of a magnetic field may vary with location, they are described as a map assigning a vector to each point of space or, more precisely-because of the way the magnetic field transforms under mirror reflection-as a field of pseudovectors. (wikipedia.org)