Argon. A noble gas with the atomic symbol Ar, atomic number 18, and atomic weight 39.948. It is used in fluorescent tubes and wherever an inert atmosphere is desired and nitrogen cannot be used.
The pressure at any point in an atmosphere due solely to the weight of the atmospheric gases above the point concerned.
A syndrome related to increased atmospheric pressure and characterized by tremors, nausea, dizziness, decreased motor and mental performance, and SEIZURES. This condition may occur in those who dive deeply (c. 1000 ft) usually while breathing a mixture of oxygen and helium. The condition is associated with a neuroexcitatory effect of helium.
Elements that constitute group 18 (formerly the zero group) of the periodic table. They are gases that generally do not react chemically.
Progressive mental disturbances and unconsciousness due to breathing mixtures of oxygen and inert gases (argon, helium, xenon, krypton, and atmospheric nitrogen) at high pressure.
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 force per unit area that the air exerts on any surface in contact with it. Primarily used for articles pertaining to air pressure within a closed environment.
A noble gas that is found in the atmosphere. It has the atomic symbol Kr, atomic number 36, atomic weight 83.80, and has been used in electric bulbs.
Measurement of the amount of air that the lungs may contain at various points in the respiratory cycle.
A polyvinyl resin used extensively in the manufacture of plastics, including medical devices, tubing, and other packaging. It is also used as a rubber substitute.
Deliberate introduction of air into the peritoneal cavity.
The vapor state of matter; nonelastic fluids in which the molecules are in free movement and their mean positions far apart. Gases tend to expand indefinitely, to diffuse and mix readily with other gases, to have definite relations of volume, temperature, and pressure, and to condense or liquefy at low temperatures or under sufficient pressure. (Grant & Hackh's Chemical Dictionary, 5th ed)
Neon. A noble gas with the atomic symbol Ne, atomic number 10, and atomic weight 20.18. It is found in the earth's crust and atmosphere as an inert, odorless gas and is used in vacuum tubes and incandescent lamps.
An element with atomic symbol O, atomic number 8, and atomic weight [15.99903; 15.99977]. It is the most abundant element on earth and essential for respiration.
Techniques where DNA is delivered directly into organelles at high speed using projectiles coated with nucleic acid, shot from a helium-powered gun (gene gun). One of these techniques involves immunization by DNA VACCINES, which delivers DNA-coated gold beads to the epidermis.
The mixture of gases present in the earth's atmosphere consisting of oxygen, nitrogen, carbon dioxide, and small amounts of other gases.
The volume of air remaining in the LUNGS at the end of a normal, quiet expiration. It is the sum of the RESIDUAL VOLUME and the EXPIRATORY RESERVE VOLUME. Common abbreviation is FRC.
An element with the atomic symbol N, atomic number 7, and atomic weight [14.00643; 14.00728]. Nitrogen exists as a diatomic gas and makes up about 78% of the earth's atmosphere by volume. It is a constituent of proteins and nucleic acids and found in all living cells.
The pressure due to the weight of fluid.
Sulfur hexafluoride. An inert gas used mainly as a test gas in respiratory physiology. Other uses include its injection in vitreoretinal surgery to restore the vitreous chamber and as a tracer in monitoring the dispersion and deposition of air pollutants.
The therapeutic intermittent administration of oxygen in a chamber at greater than sea-level atmospheric pressures (three atmospheres). It is considered effective treatment for air and gas embolisms, smoke inhalation, acute carbon monoxide poisoning, caisson disease, clostridial gangrene, etc. (From Segen, Dictionary of Modern Medicine, 1992). The list of treatment modalities includes stroke.
A type of stress exerted uniformly in all directions. Its measure is the force exerted per unit area. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
A colorless, odorless gas that can be formed by the body and is necessary for the respiration cycle of plants and animals.
The volume of air contained in the lungs at the end of a maximal inspiration. It is the equivalent to each of the following sums: VITAL CAPACITY plus RESIDUAL VOLUME; INSPIRATORY CAPACITY plus FUNCTIONAL RESIDUAL CAPACITY; TIDAL VOLUME plus INSPIRATORY RESERVE VOLUME plus functional residual capacity; or tidal volume plus inspiratory reserve volume plus EXPIRATORY RESERVE VOLUME plus residual volume.
Lasers in which a gas lasing medium is stimulated to emit light by an electric current or high-frequency oscillator.
Atomic species differing in mass number but having the same atomic number. (Grant & Hackh's Chemical Dictionary, 5th ed)
Recording of change in the size of a part as modified by the circulation in it.
Nuclear reaction in which the nucleus of a heavy atom such as uranium or plutonium is split into two approximately equal parts by a neutron, charged particle, or photon.
Antineoplastic agent that is also used as a veterinary anesthetic. It has also been used as an intermediate in organic synthesis. Urethane is suspected to be a carcinogen.
Any hindrance to the passage of air into and out of the lungs.
Methods for assessing flow through a system by injection of a known quantity of an indicator, such as a dye, radionuclide, or chilled liquid, into the system and monitoring its concentration over time at a specific point in the system. (From Dorland, 28th ed)
An activity in which the organism plunges into water. It includes scuba and bell diving. Diving as natural behavior of animals goes here, as well as diving in decompression experiments with humans or animals.
The exchange of OXYGEN and CARBON DIOXIDE between alveolar air and pulmonary capillary blood that occurs across the BLOOD-AIR BARRIER.
An optical source that emits photons in a coherent beam. Light Amplification by Stimulated Emission of Radiation (LASER) is brought about using devices that transform light of varying frequencies into a single intense, nearly nondivergent beam of monochromatic radiation. Lasers operate in the infrared, visible, ultraviolet, or X-ray regions of the spectrum.
Helium. A noble gas with the atomic symbol He, atomic number 2, and atomic weight 4.003. It is a colorless, odorless, tasteless gas that is not combustible and does not support combustion. It was first detected in the sun and is now obtained from natural gas. Medically it is used as a diluent for other gases, being especially useful with oxygen in the treatment of certain cases of respiratory obstruction, and as a vehicle for general anesthetics. (Dorland, 27th ed)
Either of the pair of organs occupying the cavity of the thorax that effect the aeration of the blood.
A noble gas with the atomic symbol Xe, atomic number 54, and atomic weight 131.30. It is found in the earth's atmosphere and has been used as an anesthetic.
The administration of drugs by the respiratory route. It includes insufflation into the respiratory tract.
Anesthesia caused by the breathing of anesthetic gases or vapors or by insufflating anesthetic gases or vapors into the respiratory tract.
A procedure involving placement of a tube into the trachea through the mouth or nose in order to provide a patient with oxygen and anesthesia.
The total volume of gas inspired or expired per unit of time, usually measured in liters per minute.
Measurement of the various processes involved in the act of respiration: inspiration, expiration, oxygen and carbon dioxide exchange, lung volume and compliance, etc.
The physical or mechanical action of the LUNGS; DIAPHRAGM; RIBS; and CHEST WALL during respiration. It includes airflow, lung volume, neural and reflex controls, mechanoreceptors, breathing patterns, etc.
Agents that are capable of inducing a total or partial loss of sensation, especially tactile sensation and pain. They may act to induce general ANESTHESIA, in which an unconscious state is achieved, or may act locally to induce numbness or lack of sensation at a targeted site.
The act of breathing with the LUNGS, consisting of INHALATION, or the taking into the lungs of the ambient air, and of EXHALATION, or the expelling of the modified air which contains more CARBON DIOXIDE than the air taken in (Blakiston's Gould Medical Dictionary, 4th ed.). This does not include tissue respiration (= OXYGEN CONSUMPTION) or cell respiration (= CELL RESPIRATION).
The chemical reactions that occur within the cells, tissues, or an organism. These processes include both the biosynthesis (ANABOLISM) and the breakdown (CATABOLISM) of organic materials utilized by the living organism.
A yellow metallic element with the atomic symbol Au, atomic number 79, and atomic weight 197. It is used in jewelry, goldplating of other metals, as currency, and in dental restoration. Many of its clinical applications, such as ANTIRHEUMATIC AGENTS, are in the form of its salts.
Any method of artificial breathing that employs mechanical or non-mechanical means to force the air into and out of the lungs. Artificial respiration or ventilation is used in individuals who have stopped breathing or have RESPIRATORY INSUFFICIENCY to increase their intake of oxygen (O2) and excretion of carbon dioxide (CO2).
A state characterized by loss of feeling or sensation. This depression of nerve function is usually the result of pharmacologic action and is induced to allow performance of surgery or other painful procedures.
The volume of air inspired or expired during each normal, quiet respiratory cycle. Common abbreviations are TV or V with subscript T.
The pressure that would be exerted by one component of a mixture of gases if it were present alone in a container. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms.
Elements of limited time intervals, contributing to particular results or situations.
Exposure of myocardial tissue to brief, repeated periods of vascular occlusion in order to render the myocardium resistant to the deleterious effects of ISCHEMIA or REPERFUSION. The period of pre-exposure and the number of times the tissue is exposed to ischemia and reperfusion vary, the average being 3 to 5 minutes.
Theoretical representations that simulate the behavior or activity of biological processes or diseases. For disease models in living animals, DISEASE MODELS, ANIMAL is available. Biological models include the use of mathematical equations, computers, and other electronic equipment.
The range or frequency distribution of a measurement in a population (of organisms, organs or things) that has not been selected for the presence of disease or abnormality.
Presence of warmth or heat or a temperature notably higher than an accustomed norm.
A microanalytical technique combining mass spectrometry and gas chromatography for the qualitative as well as quantitative determinations of compounds.
The mitochondria of the myocardium.
A neurotransmitter found at neuromuscular junctions, autonomic ganglia, parasympathetic effector junctions, a subset of sympathetic effector junctions, and at many sites in the central nervous system.
The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH = log 1/2[1/(H+)], where (H+) is the hydrogen ion concentration in gram equivalents per liter of solution. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results.
The relationship between the dose of an administered drug and the response of the organism to the drug.
A strain of albino rat developed at the Wistar Institute that has spread widely at other institutions. This has markedly diluted the original strain.

Experiment of nitrox saturation diving with trimix excursion. (1/397)

Depth limitations to diving operation with air as the breathing gas are well known: air density, oxygen toxicity, nitrogen narcosis and requirement for decompression. The main objectives of our experiment were to assess the decompression, counterdiffusion and performance aspect of helium-nitrogen-oxygen excursions from nitrox saturation. The experiment was carried out in a wet diving stimulator with "igloo" attached to a 2-lock living chamber. Four subjects of two teams of 2 divers were saturated at 25 msw simulated depth in a nitrogen oxygen chamber environment for 8 days, during which period they performed 32 divers-excursions to 60 or 80 msw pressure. Excursion gas mix was trimix of 14.6% oxygen, 50% helium and 35.4% nitrogen, which gave a bottom oxygen partial pressure of 1.0 bars at 60 msw and 1.3 at 80 msw. Excursions were for 70 min at 60 msw with three 10-min work periods and 40 min at 80 msw with two 10-min work periods. Work was on a bicycle ergometer at a moderate level. We calculated the excursion decompression with M-Values based on methods of Hamilton (Hamilton et al., 1990). Staged decompression took 70 min for the 60 msw excursion and 98 min for 80 msw, with stops beginning at 34 or 43 msw respectively. After the second dive day bubbles were heard mainly in one diver but in three divers overall, to Spencer Grade III some times. No symptoms were reported. Saturation decompression using the Repex procedures began at 40 msw and was uneventful: Grade II and sometimes III bubbles persisted in 2 of the four divers until 24 hr after surfacing. We conclude that excursions with mixture rich in helium can be performed effectively to as deep as 80 msw using these procedures.  (+info)

Comparison of two new methods for the measurement of lung volumes with two standard methods. (2/397)

BACKGROUND: The two most commonly used methods for the measurement of lung volumes are helium dilution and body plethysmography. Two methods have been developed which are both easier and less time consuming to perform. Mathematical modelling uses complex calculations from the flow-volume loop to derive total lung capacity (TLC), and the nitrogen balance technique uses nitrogen from the atmosphere to calculate lung volume in a similar way to helium dilution. This study was designed to compare the two new methods with the two standard methods. METHODS: Sixty one subjects were studied, 23 with normal lung function, 17 with restrictive airway disease, and 21 with obstructive ventilatory defects. Each subject underwent repeated measurements of TLC by each of the four methods in random order. Reproducible values were obtained for each method according to BTS/ARTP guidelines. Bland-Altman plots were constructed for comparisons between the methods and paired t tests were used to assess differences in means. RESULTS: Bland-Altman plots showed that the differences between body plethysmography and helium dilution fell into clinically acceptable ranges (agreement limits +/-0.9 l). The agreement between mathematical modelling or the nitrogen balance technique and helium dilution or body plethysmography was poor (+/-1.8-3.4 l), especially for subjects with airflow obstruction. CONCLUSIONS: Neither of the new methods agrees sufficiently with standard methods to be useful in a clinical setting.  (+info)

Influence of gas density on simulated snoring. (3/397)

According to a recent theoretical model, snoring is related to instability of the upper airway (UA). Factors promoting UA instability include increased gas density. The aim of this study was to test the influence of gas density on simulated snoring production and supraglottic resistance. Supraglottic pressure and flow rate (V') were measured in 10 healthy seated subjects during simulated snoring. Subjects breathed three different gas mixtures: Helium-oxygen, He 79%-O2 21% (He-O2); air; and sulphur hexafluoride-oxygen, F6S 79%-O2 21% (F6S-O2) administered in a random order. Supraglottic resistance (Rsg) was measured on its linear range during quiet breathing and V' was measured at the onset and middle of snoring. Linear Rsg increased and V' conversely decreased with gas density. These data are in agreement with predictions of a mathematical model of the upper airway showing that snoring occurs at lower flow rates when gas density is increased.  (+info)

Helium and sulfur hexafluoride bolus washin in short-term microgravity. (4/397)

We performed single-breath washout (SBW) tests in which He and sulfur hexafluoride (SF6) were inspired throughout the vital capacity inspirations or were inhaled as discrete boluses at different points in the inspiration. Tests were performed in normal gravity (1 G) and in up to 27 s of microgravity (microG) during parabolic flight. The phase III slope of the SBW could be accurately reconstructed from individual bolus tests when allowance for airways closure was made. Bolus tests showed that most of the SBW phase III slope results from events during inspiration at lung volumes below closing capacity and near total lung capacity, as does the SF6-He phase III slope difference. Similarly, the difference between 1 G and microG in phase III slopes for both gases was entirely accounted for by gravity-dependent events at high and low lung volumes. Phase IV height was always larger for SF6 than for He, suggesting at least some airway closure in close proximity to airways that remain open at residual volume. These results help explain previous studies in microG, which show large changes in gas mixing in vital capacity maneuvers but only small effects in tidal volume breaths.  (+info)

Intrapulmonary gas mixing and the sloping alveolar plateau in COPD patients with macroscopic emphysema. (5/397)

Chronic obstructive pulmonary disease patients, especially those with emphysema, show steep slopes of the alveolar plateau (S). This study tested the hypothesis that continued gas exchange between poorly and well-ventilated lung units by means of collateral ventilation would contribute to S in these patients. Nine young volunteers, nine older volunteers and 11 patients with macroscopic emphysema performed wash-out tests with helium (He) and sulphur hexafluoride (SF6). S was determined for breaths 1-5 (range 1), and for breaths between 95% and 98% of complete wash-out (range 2). An unequal ventilation index (UVI) was defined as the ratio between the estimated mean alveolar pressure and the end tidal pressure (PET) of each tracer gas, calculated over range 2. Over the same range, a phase III ratio was calculated by dividing PET by the estimated pressure at Fowler dead space. In all groups of subjects, the S for He and SF6 were greater for range 2 than for range 1 (p< or =0.012). In the emphysema patients, the correlations between S and UVI were 0.72 for He (p=0.012) and 0.81 for SF6 (p=0.002), while the mean phase III ratios were 1.7 for He and 2.4 for SF6, much less than their theoretical maxima. It was concluded that in patients collateral ventilation may account for only a small part of the increase in the alveolar plateau slope between ranges 1 and 2, and that this increase was mainly caused by unequal ventilation in combination with sequential emptying of lung units. The degree of sequential emptying, however, was modest compared with its full potential.  (+info)

Single-shot diffusion measurement in laser-polarized Gas. (6/397)

A single-shot pulsed gradient stimulated echo sequence is introduced to address the challenges of diffusion measurements of laser polarized 3He and 129Xe gas. Laser polarization enhances the NMR sensitivity of these noble gases by >10(3), but creates an unstable, nonthermal polarization that is not readily renewable. A new method is presented which permits parallel acquisition of the several measurements required to determine a diffusive attenuation curve. The NMR characterization of a sample's diffusion behavior can be accomplished in a single measurement, using only a single polarization step. As a demonstration, the diffusion coefficient of a sample of laser-polarized 129Xe gas is measured via this method.  (+info)

Hyperbaric bradycardia and hypoventilation in exercising men: effects of ambient pressure and breathing gas. (7/397)

We sought to determine whether hydrostatic pressure contributed to bradycardia and hypoventilation in hyperbaria. Eight men were studied during exercise at 50, 150, and 250 W while breathing 1) air at 1 bar, 2) helium-oxygen (He-O(2)) at 5.5 bar, 3) sulfur hexafluoride-oxygen (SF(6)-O(2)) at 1.3 bar, and 4) nitrogen-oxygen (N(2)-O(2)) at 5.5 bar. Gas densities were pairwise identical in 1) and 2), and 3) and 4), respectively. Increased hydrostatic pressure to 5.5 bar resulted in a modest but significant relative bradycardia on the order of 6 beats/min, in both the absence [1) vs. 2), P = 0. 0015] and presence [3) vs. 4), P = 0.029] of gases that are both denser than normal and mildly narcotic. In contrast, ventilatory responses appeared not to be influenced by hydrostatic pressure. Also, the combined exposure to increased gas density and mild-to-moderate inert gas narcosis at a given hydrostatic pressure [1) vs. 3), 2) vs. 4)] caused bradycardia (P = 0.032 and 0.061, respectively) of similar magnitude as 5.5-bar hydrostatic pressure. At the same time there was relative hypoventilation at the two higher workloads. We conclude that heart rate control, but not ventilatory control, is sensitive to relatively small increases in hydrostatic pressure.  (+info)

A model of extravascular bubble evolution: effect of changes in breathing gas composition. (8/397)

Observations of bubble evolution in rats after decompression from air dives (O. Hyldegaard and J. Madsen. Undersea Biomed. Res. 16: 185-193, 1989; O. Hyldegaard and J. Madsen. Undersea Hyperbaric Med. 21: 413-424, 1994; O. Hyldegaard, M. Moller, and J. Madsen. Undersea Biomed. Res. 18: 361-371, 1991) suggest that bubbles may resolve more safely when the breathing gas is a heliox mixture than when it is pure O(2). This is due to a transient period of bubble growth seen during switches to O(2) breathing. In an attempt to understand these experimental results, we have developed a multigas-multipressure mathematical model of bubble evolution, which consists of a bubble in a well-stirred liquid. The liquid exchanges gas with the bubble via diffusion, and the exchange between liquid and blood is described by a single-exponential time constant for each inert gas. The model indicates that bubbles resolve most rapidly in spinal tissue, in adipose tissue, and in aqueous tissues when the breathing gas is switched to O(2) after surfacing. In addition, the model suggests that switching to heliox breathing may prolong the existence of the bubble relative to breathing air for bubbles in spinal and adipose tissues. Some possible explanations for the discrepancy between model and experiment are discussed.  (+info)

Linde Healthcare offers medical helium/oxygen mixtures, for example, used in the alleviation of many medical conditions that involve a decrease in airway diameter.
TY - JOUR. T1 - Reduced lethality from ethanol or ethanol plus pentobarbital in mice exposed to 1 or 12 atmospheres absolute helium-oxygen. AU - Malcolm, Richard D.. AU - Finn, Deborah A.. AU - Syapin, Peter J.. AU - Alkana, Ronald L.. N1 - Copyright: Copyright 2007 Elsevier B.V., All rights reserved.. PY - 1985/8. Y1 - 1985/8. N2 - The present experiments investigated the effects of 1 and 12 atmospheres absolute (ATA) helium-oxygen on potentially lethal doses of ethanol given alone or in combination with pentobarbital. Drug-naive, male C57BL/6J mice were injected IP with 5.4-6.5 g/kg ethanol, 4.5-6.9 g/kg ethanol plus 20 mg/kg pentobarbital, or 50-110 mg/kg pentobarbital plus 2.5 g/kg ethanol. Following injection, the mice were placed into chambers and exposed to environments of 1 ATA air, 1 ATA helium-oxygen, or 12 ATA helium-oxygen. Exposure to 1 or 12 ATA helium-oxygen significantly reduced the lethal effect (percent mortality at given doses and LD50) of ethanol given alone or with 20 mg/kg ...
Buy quality helium gas tank for balloons products from helium gas tank for balloons manufacturer, 1045 helium gas tank for balloons manufacturers & helium gas tank for balloons suppliers from China.
Helium-4 (also written 4He) is an isotope of helium. It is the most common isotope of helium in the universe. Out of all the helium on the Earth, 99.99986% are helium-4. The nucleus (the center) of a helium-4 atom is also known as the alpha particle. Helium-4 is made of 2 protons (the part of an atomic nucleus with a positive charge), 2 neutrons (the part of an atomic nucleus with a negative charge) and 2 electrons (the part of an atom that goes around the nucleus with a negative charge).. Many helium-4 on Earth is produced from alpha decay of heavy elements. In the Sun and the whole universe, most helium-4 is made during the Big Bang, the event that created the universe. This Big Bang helium-4 is known as the primordial helium. Helium-4 is also made in nuclear fusion at the center of stars. Primordial helium is not much on Earth, because most of it had escaped from the Earth when it was created and the temperatures were very high. Helium-4 on Earth was made through radioactive decay (when ...
TY - JOUR. T1 - Use of a helium-oxygen mixture in the treatment of postextubation stridor in pediatric patients with burns. AU - Rodeberg, D. A.. AU - Easter, A. J.. AU - Washam, M. A.. AU - Housinger, T. A.. AU - Greenhalgh, David G. AU - Warden, G. D.. PY - 1995. Y1 - 1995. N2 - A mixture of helium and oxygen is less dense than room air. This property allows the gas to flow with less turbulence past airway narrowings, thereby decreasing airway resistance and increasing the volume of gas exchange. Previous studies demonstrated that airway obstruction that is manifested by stridor was present in 92% of patients requiring reintubation. Eight pediatric patients with burns in whom postextubation stridor or retractions unresponsive to racemic epinephrine developed, were treated with heliox (helium and oxygen) for 28 ± 5 hours with an initial helium concentration between 50% and 70%. Of the eight patients treated with heliox, only two experienced respiratory distress and required reintubation. ...
So, how do you trap a helium-8 isotope? The answer is far from simple, but Argonne physicist Peter Mueller has found a solution. Using the GANIL cyclotron facility in northern France, helium-4, 6, and occasionally helium-8 isotopes can be generated. This is one of the only cyclotrons is the world with enough energy to generate the helium-8 isotope. It is all very well creating the particle, but to separate helium-8 from its other helium isotope siblings requires a clever and highly accurate laser prison for the heavier helium isotope to fall in to, whilst allowing the other, lighter, isotopes to fly straight through.. Acting as the bars of prison gates, six lasers are accurately aligned at such spacing that only isotopes with the dimensions of helium-8 are trapped. When aligned, helium-8 will fall between them, and should the isotope try to escape, repulsion forces keep the isotope still. Once enough time is allowed to pass (about one helium-8 atom is generated every two minutes) the team ...
Helium Gas For Sale in Malaysia. 22Litres of Helium Gas for Balloons available for shipping to whole Malaysia. Comes in a convenient Portable Helium Gas Tank used to fill balloons
Helium Gas For Sale in Malaysia. 22Litres of Helium Gas for Balloons available for shipping to whole Malaysia. Comes in a convenient Portable Helium Gas Tank used to fill balloons
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The helium ion microscope is offering new windows into nano-scale imaging. Unique sample interaction dynamics allow new types of sample information to be gathered. Some fundamental advantages conferred by probing a surface with a helium ion beam are the high contrast due to the sensitive material dependence of the secondary electron (SE) yield, the surface sensitivity arising from the low energy of the SEs, and the ability to image low atomic weight materials due to a greater electronic cross-section of ions. The low mass of helium allows imaging via the collection of backscattered ions. There are also secondary benefits to helium ion microscopy. Ions beams allow easy imaging of non-conducting samples through the use of charge neutralization. The Orion™ tool is equipped with a low energy flood gun for this purpose and has been demonstrated effective even at high image magnification. The low mass of the helium ion minimizes beam induced damage - indeed on some materials sputtering is not detected even
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The study evaluated seven intensive care unit (ICU) ventilators (Veolar FT, Galileo, Evita 2, Evita 4, Servo 900C, Servo 300, Nellcor Puritan Bennett 7200 Series) with helium-oxygen (HeO2), using a lung model, to develop correction factors for the sa
A new imaging technology based on a scanning helium ion beam has been realized. This technology has several advantages over the traditional SEM. Due to the very high source brightness, and the shorter wavelength of the helium ions, it is possible to focus the ion beam to a smaller probe size relative to a SEM. Also, as the ion beam interacts with the sample, it does not suffer from a large excitation volume, and hence provides sharp images on a wide range of materials. Compared to a SEM, the secondary electron yield is quite high - allowing for imaging with currents as low as 1 femtoamp. The detectors provide information-rich images which offer topographic, material, crystallographic, and electrical properties of the sample. In contrast to other ion beams, there is no discernable sample damage due to relatively light mass of the helium ion. Sample images will be presented.
The appeal of helium-3 fusion stems from the nature of its reaction products. Helium-4 is non-radioactive and the lone high-energy proton produced is easily contained using electric and magnetic fields. In contrast, most other proposed fusion processes for power generation lead to the production of energetic neutrons, bombardment with which renders reactor components radioactive. Most of the energy from the conventional fusion reaction is given off in this form, which is difficult to harness for energy; whereas the proton can be contained and leads to high temperatures which might be liberated for energy generation. Helium-3 is used in cryogenics to achieve temperatures as low as a few thousandths of a kelvin; it was discovered by the Australian nuclear physicist Mark Oliphant while based at Cambridge Universitys Cavendish Laboratory. An important property of helium-3, which distinguishes it from the more common helium-4, is that its nucleus is a fermion since it contains an odd number of ...
Polarean Imaging Ltd. is manufacturer and service provider for noble gas polarizer devices and ancillary instruments with special focus on pulmonary imaging using hyperpolarized gas MRI. Current product offerings of Polarean Imaging Ltd. include xenon-129 and helium-3 polarizers, polarization measurement stations and upgrade kits for existing polarizers
In order to use your balloons, you will need to inflate them. One option is to air-fill them, but if you want balloons to float then you will need one of our helium canisters.. As well as providing a unique floating display, our helium canisters will save you inflation time - meaning they are both cost and time effective.. We offer a range of rental helium gas cylinders, which are larger and suitable for more regular use, as well as the sale of smaller disposable helium gas cylinders, safe and easy to handle and transport for small displays and events. ...
Disposable Helium Gas Cylinder with 30 Yellow Balloons and Curling Ribbon. Capacity: Each Cylinder 0.25 Cubic mtrs This pack does not contain any heli-valves Please note we can ship helium cylinders to Northern Ireland, only on a 2 working day shipping option. Please CLICK HERE to view our BALLOON INFLATION CHART. Please make a sizer with 2 armchairs placed 9 Inches apart and place the helium gas tank underneath. As the inflated balloons touch the side of the armchairs please remove and tie the balloon to the curling ribbon Please Note: Curling Ribbon Colour may not match the Colour shade of the Balloons provided. For best results, fill the Balloons 1-2 hours before your event.Average float time will vary depending upon the size and type of balloons. Colour shades may vary from the Image shown.
Disposable Helium Gas Cylinder with 30 Assorted Balloons and Curling Ribbon. Capacity: Each Cylinder 0.25 Cubic metres The small disposable helium gas tank will inflate 30 of 9 Inch latex balloons, 15 of 11 Inch latex balloons or 12 of 18 Inch Foil Balloons This pack does not contain any heli-valves Please note we can ship helium cylinders to Northern Ireland, only on a 2 working day shipping option. For best results, fill the Balloons 1-2 hours before your event. Average float time will vary depending upon the size and type of balloons. Please Note: Curling Ribbon Colour may not match the Colour shade of the Balloons provided.
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[106 Pages Report] Check for Discount on United States Helium Gas Market Report 2017 report by QYResearch Group. In this report, the United States Helium Gas market is...
As of 24/03/2009 this record has been updated; all changes can be found in the relevant fields under the above update date. Please also note that the anticipated start and end date have also been updated; the initial information at the time of registration were ...
Helium gas is a colourless, odourless, tasteless, non-toxic gas. It is relatively rare in our atmosphere equating to approximatley 5 ppm by volume. Helium is formed by the radioactive decay of heavy elements such as thorium and uranium. This radiogenic helium is trapped with natural gas deposits and can be concentrated up to 7% by volume. Commercial extraction involves the use of semi-permeable membranes and low-temperature fractional distillation. Helium is transported in a liquid form at temperatures of -269 degrees Celcius.. Helium is mainly used in its liquid form (cryogenics) for the cooling of superconducting magnets found in medical scanning instruments.. Inhaling helium can be dangerous, helium displaces oxygen needed for normal respiration and should not be attempted by any person. ...
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GC Application #22646: EPA 8082 Aroclor 1016 by GC/ECD on ZB-CLPesticides-2 (Helium Gas). Column used: Zebron ZB-CLPesticides-2 Column 30m x 0.32mm x 0.25um , Ea Part#: 7HM-G029-11
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The Advanced Technology Purifier (ATP) can purify up to 30 liters of helium gas per minute. At this pace, it is the system of choice for providing clean ...
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HHe3 magnetic resonance provides a new technique for imaging the distribution of inhaled air in the lungs. The technique is suitable for following responses to treatment of asthma and changes after methacholine or exercise challenge.
PubMed Central Canada (PMC Canada) provides free access to a stable and permanent online digital archive of full-text, peer-reviewed health and life sciences research publications. It builds on PubMed Central (PMC), the U.S. National Institutes of Health (NIH) free digital archive of biomedical and life sciences journal literature and is a member of the broader PMC International (PMCI) network of e-repositories.
Ultra high purity gases usually cost more than gases of lower purities due to the process involved in making the gases. One such method of purification uses filters of decreasing pore size to remove larger particles as the gas enters, and smaller particles as the gas continues through, such that enough impurities are removed from the gas to achieve Ultra High Purity.. Speciality Gases provides certified ultra pure gases i.e. Nitrogen, Argon, Helium, Zero Air, Hydrogen to be used as carrier gas in Gas Chromatographs (GCs) and other analytical instruments.. Our ultra pure gases have stringent high-purity specifications. We achieve consistent high-purity through extensive gas cylinder preparation, dedication of gas cylinders for gas service and quality control at every step.. By using our High purity Gases you will optimize cost and quality of analytical results, regardless of application and significantly extend the life of GC columns, detectors and instruments.. ...
The evolution of radiation damage from the bubble formation stage to the surface blistering or exfoliation stage or both in 316 stainless steel irradiated with 80-keV helium ions was observed dynamically in high-voltage electron microscope. Exfoliation, which occurred at temperatures ≤570°C, in the electron transparent regions was observed to differ from bulk exfoliation in that it usually occurred in roughly circular patches. The diameter of these patches increased with increasing specimen thickness. More bulklike sheet exfoliations occurred in the thicker regions. The process started in the thicker regions and proceeded to the thinner regions. All exfoliation occurred on the beam-entrance side. Specimens irradiated at 650°C exhibited surface damage primarily consisting of blisters. The damage varied significantly with specimen thickness. In the thinnest regions, entire grains were bent so that the grain surface was concave on the beam-entrance side and convex on the beam-exit side. In ...
The novel technique, called helium ion microscopy (HIM), was used to image hard-to-see interaction between bacteria and viruses infecting bacteria, or so called bacteriophages. These phages are currently actively considered as a novel smart weapon against bacterial infections, which are becoming more and more difficult to treat with traditional antibiotics. The images demonstrated in clear images the different stages of how the phages in question attacked the bacteria (E. coli), for example showing the process where the virus has latched onto the bacterial surface, grabbing it with a tentacle like structure, and being in the process of injecting its genome into the bacterial cell ...
Carl Zeiss ORION Plus Helium Ion Microscope moves beyond sub-nanometer imaging to advance the fabrication of nano-electronic and nano-photonic devices.
Polarean Imaging Ltd. is manufacturer and service provider for noble gas polarizer devices and ancillary instruments with special focus on pulmonary imaging using hyperpolarized gas MRI. Current product offerings of Polarean Imaging Ltd. include xenon-129 and helium-3 polarizers, polarization measurement stations and upgrade kits for existing polarizers
In the present work two nuclei have been investigated by the elastic scattering of charged particles of spin 1/2 from spin 0 nuclei. In the first experiment protons were scattered from He4 yielding information on the compound nucleus Li5. A phase shift analysis of the angular distributions has been done. The results of experiments from 1 to 18 mev of proton bombarding energy have been collected, and the resulting phase shifts have been interpreted in the light of the dispersion theory. In the second experiment He3 nuclei were scattered from He 4 giving information about the compound nucleus Be7. The second excited state of Be7 has been investigated, and the level parameters have been determined. The non-resonant phase shifts show a somewhat anomalous behaviour in the energy range investigated, and these phase shifts have been qualitatively interpreted in terms of other levels in Be7. The phase shift analysis of these experiments has been done on an IBM 650 computer, and as a by-product of the ...
High-precision SF 6 The gas density relay comprises a gas density relay shell, a base, an end seat, a Bardon tube, a temperature compensation element, a signal adjusting mechanism and a plurality of micro switches serving as signal generators, wherein the base, the end seat, the Bardon tube, the temperature compensation element and the signal adjusting mechanism are arranged in the shell; one end of the microswitch contact triggering element is fixed in the shell, and the other end of the microswitch contact triggering element is arranged corresponding to the buttons of the button type microswitch and is abutted against the buttons of each microswitch in a one-to-one correspondence manner; when the gas density value changes, the bourdon tube and the temperature compensation element generate displacement, the displacement drives the micro-switch contact triggering element through the signal triggering mechanism in sequence, and the micro-switch contact triggering element changes in position to
Helium-3 occurs as a primordial nuclide, escaping from the Earths crust into the atmosphere and into outer space over millions of years. Helium-3 is also thought to be a natural nucleogenic and cosmogenic nuclide, one produced when lithium is bombarded by natural neutrons. Those are released by spontaneous fission and by nuclear reactions with cosmic rays. Some of the helium-3 found in the terrestrial atmosphere is also a relic of atmospheric and underwater nuclear weapons testing, conducted by the three big nuclear powers before 1963. Most of this comes from the decay of tritium (hydrogen-3), which decays into helium-3 with a half life of about 12.3 years. Furthermore, some nuclear reactors (landbound or shipbound) periodically release some helium-3 and tritium into the atmosphere, especially whenever something goes wrong. The nuclear reactor disaster at Chernobyl released a huge amount of radioactive tritium into the atmosphere, and smaller problems cause smaller releases. Furthermore, ...
The spectroscopic measurement of helium ion velocity distribution functions in a low temperature plasma is problematic for a number of reasons. First and foremost is the difficulty in accessing the UV and soft x-ray transitions to the ground state. Conventional laser induced fluorescence on ions in plasmas is routinely performed in argon, neon, xenon, and barium. Two-photon absorption laser induced fluorescence (TALIF) on neutrals has been demonstrated in hydrogen, nitrogen, and oxygen plasmas. We have successfully performed LIF on helium atoms and have had some hints of success with laser absorption spectroscopy on excited states of helium ions, the n $=$ 5 to n $=$ 6 transition in the infrared (1012 nm). Here we report a new approach using TALIF to access the n $=$ 2 to n $=$ 6 transition of singly ionized helium. The fluorescence path at 656 nm completes the three-level sequence. To obtain the electron temperatures necessary to create a sufficient population of metastable helium ions trapped ...
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A one-dimensional numerical simulation of a homogeneous dielectric barrier discharge has been carried out for a nonequilibrium helium-oxygen mixture plasma
2004. de Lange E.E., Altes T.A., Patrie J., Gaare J., Brookeman J.R., Mugler J.P. III. Hyperpolarized Helium-3 MR Imaging of the lung in asthmatics: Evaluation of changes following methacholine and exercise challenge. Radiological Society of North America,Chicago, IL, 2004.. Gaare J., Altes T.A., Knake J.J., Brookeman J.R., Mugler J.P. III, de Lange E.E. Hyperpolarized Helium-3 MR (H3-HeMR) Imaging of the lung in asthmatics: Ventilation changes following treatment with albuterol. Radiological Society of North America, Chicago, IL, 2004.. Altes T.A ., Zhang H., Salerno M., Brookeman J.R., de Lange E.E., Mugler J.P. III. Repeatability of the Hyperpolarized Helium-3 Apparent Diffusion Coefficient. Radiological Society of North America, Chicago, IL, 2004.. Altes T.A ., Mugler J.P. III, Mata J., Benjamin-Watkins J., Herily S., de Lange E.E., Brookeman J.R. Assessment of lung development using hyperpolarized helium-3 MR lung imaging. International Society of Magnetic Resonance Medicine [ISMRM] , ...
sulphur hexafluoride device Argentina.Sulfur hexafluoride or sulphur hexafluoride, is an extremely potent and persistent man-made greenhouse gas that is primarily utilized as an electrical insulator and arc suppressant. It is inorganic, colorless, odorless, non-flammable, and non-toxic. SF 6 has an octahedral geometry, consisting of six fluorine atoms attached to a central sulfur atom. It is a hypervalent molecule. Typical for a nonpolar …Chemical formula: SF₆Molar mass: 146.06 g/molMelting point: −64 °C; −83 °F; 209 KSolubility in water: 0.003% (25 °C)Missing:ArgentinaMust include:ArgentinaPeople also askIs sulfur hexafluoride explosive?Is sulfur hexafluoride explosive?Sulfur hexafluoride has no lower and upper explosive limits but can severely react with disilane and form a dangerous explosive gas mixture. SF6 easily hydrolyses into fluorinated compounds in water (thionyl fluoride and hydrogen fluoride) that are extremely toxic and corrosive substances .SF6 gas detector, Sulfur hexafluoride
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Looking for Helium on the moon? Find out information about Helium on the moon. The isotope of helium with mass number 3, constituting approximately 1.3 parts per million of naturally occurring helium Explanation of Helium on the moon
TY - JOUR. T1 - Low-energy helium-neon laser irradiation increases the motility of cultured human keratinocytes. AU - Haas, Ann F.. AU - Isseroff, Roslyn Rivkah. AU - Wheeland, Ronald G.. AU - Rood, Pamela A.. AU - Graves, Phillip J.. PY - 1990/6. Y1 - 1990/6. N2 - Helium-neon (HeNe) laser irradiation is known to stimulate wound healing. We investigated whether the biostimulatory effects of HeNe irradiation result from enhancement of keratinocyte proliferation or motility. HeNe effects on keratinocyte motility were evaluated by irradiating a wounded culture with 0.8 J/cm2 3 times over a 20-h period. At 20 h post-irradiation, videocinemicroscopy and sequential quantitative measurements of the leading edge were taken over a 6-h period. There was a significant difference in migration of the leading edge in irradiated wounds compared to non-irradiated wounded controls (12.0 μm/h vs 4.0 μm/h, p , 0.0001). To determine if the increase in migration observed in irradiated cultures resulted from ...
tender Sulfur hexafluoride purification in mexico* Sulfur Hexafluoride can affect you when breathed in. * Sulfur Hexafluoride can irritate the skin causing a rash or burning feeling on contact. Direct skin contact can cause frostbite. * Sulfur Hexafluoride may cause severe eye burns leading to permanent damage. * Breathing Sulfur Hexafluoride can irritate the nose and throat.
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Portable sulphur hexafluoride monitoring.As sulfur hexafluoride can absolutely not be detected without proper equipment (odorless and colorless gas), only an SF6 detector can accurately measure concentrations of this asphyxiating gas and properly monitor SF6 gas hazards. Thus it is advised to use a fixed or portable sulfur hexafluoride …Portable Analyzer detects Sulfur Hexafluoride.
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Global Sulfur Hexafluoride Market Size By Product, By Application, By Geographic Scope And Forecast. Sulfur Hexafluoride Market Size And Forecast Sulfur Hexafluoride Market was valued at USD 206.7 Million in 2019 and is projected to reach USD 324.8 Million by 2027, growing at a CAGR of 5.8 % from 2020 to 2027. Global Sulfur Hexafluoride Market Ou
28/10/2020Various applications of sulfur hexafluoride (SF6) in medical instruments are bolstering the growth of the sulfur hexafluoride market in the region.New York, Oct. 28, 2020 (GLOBE NEWSWIRE) Reportlinker announces the release of the report Middle East and Africa Sulfur Hexafluoride Market Forecast to 2027 COVID 19 Impact and Regional Analysis by Grade, End user reportlinker/p05978881/?utm_source=GNW In the medical industry, Sulfur hexafluoride …. Get Price ...
For example, a Helium/Oxygen mix would quickly become 100% Oxygen on the ground no matter what planet you were on. This is not to mention a Xenon/Oxygen mixture would knock you out nearly instantly, much like Nitrous Oxide does and breathing Argon/Oxygen mixtures is considered doping by the Olympic committee. On atmospheric scales these gases could possibly separate into layers with no O2 at sea level since Argon is about 25% times heavier. However, CO2 still mixes well in our own atmosphere even though it is about 50% heavier than the Nitrogen/Oxygen mixture which makes up the majority of our air. Nitrogen and Oxygen are very close in weight so they mix well. As you well know, plants still thrive in the mountains until it gets too cold. Water Vapor behaves differently in all these different mixes too. In gases that it can diffuse quickly in, like Helium, you would probably never develop clouds on that planet. However, I wont take any of this into account and I will leave elevation at zero in ...
Open access preprint on Helium Ion Microscopy with Secondary Ion Mass Spectrometry (HIM-SIMS) for the analysis and quantitation of polyolefins
dilo sulfur hexafluoride Leakmate for cablesSulfur hexafluoride circuit breakers protect electrical power stations and distribution systems by interrupting electric currents, when tripped by a protective relay. Instead of oil, air, or a vacuum, a sulfur hexafluoride circuit breaker uses sulfur hexafluoride gas to cool and quench the arc on opening a circuit. Advantages over other media include lower operating noise and no emission of hot gases, and relatively low maintenance. Developed in the 1950s and onward, SF6 circuit breakers are wid
fill Sulfur hexafluoride switchgear repair In KenyaSulfur hexafluoride circuit breakers protect electrical power stations and distribution systems by interrupting electric currents, when tripped by a protective relay. Instead of oil, air, or a vacuum, a sulfur hexafluoride circuit breaker uses sulfur hexafluoride (SF 6 ) gas to cool and quench the arc on opening a circuit.
recover Sulfur hexafluoride specilist factory-sell-directlySulfur hexafluoride. SF₆ Product information Characteristics Physical data Product specification Shipping information Sulfur hexafluoride is used for plasma etching prior to chemical vapor deposition (CVD). Its uses include oxide etching, nitride etching, and wafer cleaning. Sulfur hexafluoride is also used in plasma chamber cleaning processes.
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Lung ventilation was mapped in seven healthy male Sprague-Dawley rats (433 ± 24 g) using hyperpolarized 129Xe magnetic resonance imaging (MRI) at 3.0 T, and validated with hyperpolarized 3He MRI under similar ventilator conditions. Ventilation maps were obtained using flip angle variation for offset of RF and relaxation (FAVOR) which is a multiple breath imaging technique that extracts the fractional ventilation parameter, r, on a pixel-by-pixel basis from the dynamic signal enhancement. r is defined as the fractional refreshment of gas per breath. Under the ventilator conditions used in this work, whole-lung measurements of fractional ventilation obtained using hyperpolarized 129Xe were not significantly different from those obtained using hyperpolarized 3He (p = 0.8125 by a Wilcoxon matched pairs test). Fractional ventilation gradients calculated in the superior/inferior (S/I) and anterior/posterior (A/P) directions obtained using hyperpolarized 129Xe were not significantly different from ...
The Biotechnology High Performance Computing Software Applications Institute (BHSAI) of the Department of Defense (DoD) is studying airflow in the lungs using computational fluid dynamics in order to characterize disease-specific airflow patterns and provide useful information for medical applications. To validate these models, they are seeking to obtain experimental data of airflow in human lungs, both healthy and diseased. An assessment of airflow can be obtained by using hyperpolarized noble gas (HNG) magnetic resonance imaging (MRI) or, more specifically, hyperpolarized helium-3 (HHe) MRI in conjunction with flow-encoding schemes that are well-established in conventional proton MRI. Four chronic obstructive pulmonary disease (COPD) patients and four healthy subjects will undergo pulmonary function tests (PFTs), computed tomography (CT) scan covering the mouth, neck, and chest, and hyperpolarized helium 3 MRI. Before and after the MRI scans, three spirometry readings will be taken while the ...
sulphur hexafluoride gas analyzing best in MalaysiaMar 31, 2021 · A sulfur hexafluoride (SF6) circuit breaker uses contacts surrounded by sulfur hexafluoride gas to quench the arc. They are most often used for transmission-level voltages and may be incorporated into compact gas-insulated switchgear. First, for industry structure analysis, the SF6 gas circuit breaker industry is fragmented.
how much sulfur hexafluoride Transfer factoryHandling and Use of Sulfur Hexafluoride Gas Page 5 of 8 C. Filling Equipment with Sulfur Hexafluoride Gas 1. Obtain a SF 6 Gas Processing or Transfer Cart as needs dictate. 2. Connect SF 6 source to gas compartment valve. a) Processing cart (preferred method): (1) Connect hose to gas compartment valve and tighten all fittings.
GE Sulfur hexafluoride Circuit brkaer Maintenance BangaloreAug 17, 2017 · A circuit breaker in which the current carrying contacts operate in sulfur hexafluoride or SF6 gas is known as SF6 circuit breaker.SF6 is a very good dielectric material which can resist high potentials.SF6 gas is used as the arc quenching medium Sulfur Hexafluoride (SF6) is an electro-negative gas and has a strong tendency to absorb free electrons.
Micafluid sulphur hexafluoride Service.Sulfur Hexafluoride is a colorless and odorless gas. SF 6 -gas is a non-toxic, non-flammable, stable compound. Its breakdown voltage is approximately 2.5 times higher than normal air, as the electro-negative SF 6 -molecule has a strong affinity to free electrons. It has over 100 times better arc quenching capability and significant better heat dissipation than air (N 2).SF6 (Sulfur Hexafluoride) Recovery | Hudson Technologies
sulphur hexafluoride Analyser For determining the quality.SF6 gas analysis introduction - for more than 50 years, Sulphur Hexafluoride (SF6) which is a man made gas has been used successfully in various industries. It is …Sulphur Hexafluoride | Edinburgh Sensors | Gas Detection ...
Sulfur hexafluoride - Wikipedia. Sulfur hexafluoride or sulphur hexafluoride, is an extremely potent and persistent man-made greenhouse gas that is primarily utilized as an electrical insulator and arc suppressant. It is inorganic, colorless, odorless, non-flammable, and non-toxic. SF 6 has an octahedral geometry, consisting of six fluorine atoms attached to a central sulfur atom. It is a hypervalent molecule. Typical for a nonpolar gas, SF 6. Get Price ...
Regulation for Reducing Sulfur Hexafluoride Emissions from ...· Regulation for Reducing Sulfur Hexafluoride Emissions from Gas Insulated Switchgear . Back To All Rulemaking. This page last reviewed July 21, 2020. Regulation for Reducing Sulfur Hexafluoride Emissions from Gas Insulated Switchgear . Hearing Date(s) September 24, 2020. Public Comments Received.
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inproceedings{2101216, author = {Schauvliege, Stijn and Savvas, I and Gasthuys, Frank}, booktitle = {AVA spring meeting Davos 2012}, language = {eng}, location = {Davos, Switzerland}, pages = {34--34}, publisher = {Association of Veterinary Anaesthetists (AVA)}, title = {The effect of pure oxygen or air/oxygen mixture on arterial blood oxygenation in spontaneously ventilated isoflurane anaesthetized horses: a retrospective study}, year = {2012 ...
Because maximum expiratory flow-volume rates in normal subjects are dependent on gas density, the resistance between alveoli and the point at which dynamic compression begins (R(us)) is mostly due to convective acceleration and turbulence. We measured maximum expiratory flow-volume (MEFV) curves in …
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Wuhan huayi Sulfur hexafluoride service cart JaipurSulfur hexafluoride (SF 6) or sulphur hexafluoride (British spelling), is an extremely potent and persistent greenhouse gas that is primarily utilized as an electrical insulator and arc suppressant. [7] [8] It is inorganic, colorless, odorless, non- flammable, and non-toxic.
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GE Grid sulfur hexafluoride Analyser pricesGE Renewable Energys Grid Solutions business (NYSE: GE) and Hitachi ABB Power Grids Ltd. announced today a non-exclusive, cross-licensing agreement related to the use of an alternative gas to sulfur hexafluoride (SF6) used in high voltage equipment. This fluoronitrile-based gas mixture has a significantly reduced impact on the environment compared to SF6.
For the name "helium" see also Jensen, William B. (2004). "Why Helium Ends in "ium"". Journal of Chemical Education. 81 (7): ... Discovery of helium[edit]. In 1868 Janssen discovered how to observe solar prominences without an eclipse. While observing the ... Nath, B. B. (2012). The Discovery of Helium and the Birth of Astrophysics. Springer.. ... Oxford English Dictionary (1989), s.v. "helium". Retrieved 16 December 2006, from Oxford English Dictionary Online. Also, from ...
... or unconventional liquids such as helium-4 or helium-3 at sufficiently low temperature. For more than 50 years it was thus ... Experiments using helium[edit]. While several experiments yielded negative results, in the 1980s, John Goodkind discovered the ... In the case of helium-4, it has been conjectured since the 1960s that it might be possible to create a supersolid.[1] Starting ... Kim, E.; Chan, M. H. W. (2004). "Probable Observation of a Supersolid Helium Phase". Nature. 427 (6971): 225-227. Bibcode: ...
Confined Helium Experiment[edit]. The Confined Helium Experiment (CHeX) provides a test of theories of the influence of ... boundaries on matter by measuring the heat capacity of helium as it is confined to two dimensions. ...
Helium, Autoclave, Wild Flag, Ex Hex. Mary Bozana Timony (born October 17, 1970) is an American independent singer-songwriter, ... Helium disbanded in 1998, whereupon Timony embarked on her solo career, recording albums in 2000 and 2002 (Mountains and The ... She has been a member of the bands Helium, Autoclave and Wild Flag, and currently fronts Ex Hex. ... In addition to her work with Autoclave, Helium, and the Mary Timony Band, Timony has occasionally collaborated or recorded with ...
Helium system[edit]. In addition to fuel and oxidizer systems, the launch vehicle's main propulsion system is also equipped ... In an emergency, the valves can be fully closed by using the engine's helium supply system as a backup actuation system.[6] ... During entry, on the Space Shuttle, any remaining helium was used to purge the engines during reentry and for repressurization. ... Loss of helium pressure in this cavity results in automatic engine shutdown.[6] ...
Helium, heavy elements, and neutrons[edit]. "Triple tracks" in a CR-39 plastic radiation detector claimed as evidence for ... However, the authors later retracted that report, saying that the helium they measured was due to background from the air.[19][ ... One of the main criticisms of cold fusion was that deuteron-deuteron fusion into helium was expected to result in the ... Paneth, Fritz; Peters, Kurt (1926), "Über die Verwandlung von Wasserstoff in Helium", Naturwissenschaften (in German), 14 (43 ...
Use of hydrogen instead of helium[edit]. Helium was initially selected for the lifting gas because it was the safest to use in ... Despite a U.S. ban on the export of helium under the Helium Control Act of 1927,[14] the Germans designed the airship to use ... 2015). Helium: The Disappearing Element. New York: Springer. ISBN 9783319151236. .. *Toland, John. The Great Dirigibles: Their ... Because of its expense and rarity, American rigid airships using helium were forced to conserve the gas at all costs and this ...
Helium. 1.000036 Hydrogen. 1.000132 Carbon dioxide. 1.00045 Liquids at 20 °C ...
Helium 1868 P. Janssen and N. Lockyer 1895 W. Ramsay, T. Cleve, and N. Langlet Janssen and Lockyer observed independently a ... Prepared by bombardment of einsteinium with helium.[147] 103 Lawrencium 1961 A. Ghiorso, T. Sikkeland, E. Larsh and M. Latimer ... Years later after the isolation of argon on Earth, Ramsay, Cleve, and Langlet observed independently helium trapped in cleveite ...
... is a lifting gas on Venus in the same way that helium is a lifting gas on Earth, the upper atmosphere has been proposed as a ...
Helium does not solidify at a pressure of one atmosphere. Helium can only solidify at pressures above 25 atmospheres, which ... This prediction was later confirmed by experiment.[7] At the other end of the scale, helium does not freeze at all at normal ...
Helium: Boiling point at atmospheric pressure (common cooling agent of low temperature physics; for reference) ... mostly liquid helium. Unfortunately, none of high-temperature superconductors are coolable using only dry ice, and none of them ... it can be cooled with liquid helium, which works at much lower temperatures. ...
... such as helium, thallium, and caesium. Spectral lines also depend on the physical conditions of the gas, so they are widely ...
Helium He Atomic Number: 2 Atomic Weight: 4.002602 Melting Point: 0.95 K. Boiling Point: 4.22 K. Specific mass: 0.0001785. ... Earth has retained all of the noble gases that were present at its formation except helium. Krypton's concentration in the ... rather than the more familiar helium-neon variety, which could not achieve the same multi-watt outputs.[35] ... except helium, which has a hexagonal close-packed crystal structure). ...
Helium. 36.65[16]. Ice. 51. Indium phosphide. 4.6. 13.8. Invar. 1.2. 3.6. ...
helium: helium hydride (only exists as an ion). According to the convention above, the following are "hydrogen compounds" and ...
He-lium2He​4.0026 2 Lith-ium3Li​6.94 Beryl-lium4Be​9.0122 Boron5B​10.81 Carbon6C​12.011 Nitro-gen7N​14.007 Oxy-gen8O​15.999 ... For helium, Ar, abridged(He) = 4.0026. For thirteen elements the samples diverge on this value, because their sample sources ... Typically, such a value is, for example helium: Ar, standard(He) = 4.002602(2). The "(2)" indicates the uncertainty in the last ... Helium: Ar, standard(He) = 4.002602(2) → Ar, abridged(He) = 4.0026 ...
Most 16O is synthesized at the end of the helium fusion process in massive stars but some is made in the neon burning process.[ ... Oxygen is the third most abundant chemical element in the universe, after hydrogen and helium.[60] About 0.9% of the Sun's mass ... After hydrogen and helium, oxygen is the third-most abundant element in the universe by mass. At standard temperature and ... 2 with other gases, such as nitrogen or helium, to prevent oxygen toxicity.[110] ...
Helium. BLM operates the National Helium Reserve near Amarillo, Texas, a program begun in 1925 during the time of the Zeppelin ... "Our Government May Be Shut Down, but at Least Our Helium Reserve Won't Be ... for Now". slate.com. Slate. Archived from the ... it remains subject to oversight of the BLM under the provisions of the unanimously-passed Responsible Helium Administration and ... "Opinion - An Ode to Helium". Archived from the original on 9 November 2017. Retrieved 26 February 2017 - via NYTimes.com. ...
Most of the helium in the crust of the Earth (about 99% of the helium from gas wells, as shown by its lower abundance of helium ... These colors can be replicated using a gas-discharge lamp containing the same element.[108] Helium was discovered in this way ... In about three minutes Big Bang nucleosynthesis produced most of the helium, lithium, and deuterium in the Universe, and ... Alpha decay: this process is caused when the nucleus emits an alpha particle, which is a helium nucleus consisting of two ...
In the case of a monatomic gas such as helium under constant volume, if it is assumed that no electronic or nuclear quantum ... Molecules are quite different from the monatomic gases like helium and argon. With monatomic gases, thermal energy comprises ...
Helium has a density of 1.785 × 10−4 g/cm3 (cf. air 1.225 × 10−3 g/cm3), liquifies at −268.928 °C, and cannot be solidified at ... Bunge AV & Bunge CF 1979, "Electron affinity of helium (1s2s)3S", Physical Review A, vol. 19, no. 2, pp. 452-456, doi:10.1103/ ... Helium: In 1868, Janssen and Lockyer independently observed a yellow line in the solar spectrum that did not match that of any ... Helium, as an s-block element, would normally be placed next to hydrogen and above beryllium. However, since it is a noble gas ...
Most of the helium in the crust of the Earth (about 99% of the helium from gas wells, as shown by its lower abundance of helium ... Helium was discovered in this way in the spectrum of the Sun 23 years before it was found on Earth. Baryonic matter forms about ... Although small numbers of independent atoms of noble gases exist, such as argon, neon, and helium, 99% of the atmosphere is ... Winter, Mark (2007). "Helium". WebElements. Archived from the original on 30 December 2007. Hinshaw, Gary (10 February 2006). " ...
Helium. p. 1. "Muhammad : His Life Based on the Earliest Sources : Revised Edition : Martin Lings (Abu Bakr Siraj Ad-Din)". ...
"Helium - Pirate Prude - This Day In Matador History". "Helium". Trouser Press. Retrieved 15 October 2020. CS1 maint: ... Helium , Songs, Reviews, Credits , AllMusic" - via www.allmusic.com. "Robert Christgau: CG: helium". www.robertchristgau.com. ... Pirate Prude is the debut EP from American indie rock band Helium. It was released March 8, 1994, on Matador Records. Its ... p. 227.CS1 maint: location (link) "Helium , Biography & History". AllMusic. Amorosi, A. D. "Mary Timony returns to the scene of ...
Helium). As more carbon dioxide dissolves in water, its pCO2 rises until it equals the pCO2 of the overlying atmosphere. ...
"About me". Helium. Archived from the original on July 20, 2011. CS1 maint: discouraged parameter (link) This article ...
"Helium". Trouser Press. Retrieved 15 October 2020. CS1 maint: discouraged parameter (link) "Helium , Biography & History". ... The Dirt of Luck is the first full-length album from American indie rock band Helium. It was released in April 1995 on Matador ... "For '90s indie fave Helium, a simple reissue became a second act". Salon. May 18, 2017. Exposito, Suzy (June 9, 2017). " ... "Singer-Guitarist Mary Timony Revisits Helium's Music in Advance of Reunion Show". Cleveland Scene. Phares, Heather. The Dirt of ...
"Why a college degree is important for professional athletes". Helium. Missing or empty ,url= (help) McCormick, A. C. "The myth ...
... is an EP by the alternative rock band Helium. It was released in April 1997 on Matador Records. "Silver Strings" " ... Helium". www.trouserpress.com. Bogdanov, Vladimir; Woodstra, Chris; Erlewine, Stephen Thomas (October 8, 2002). All Music Guide ...
helium (countable and uncountable, plural heliums). *(uncountable) A colorless and inert gas, and the second lightest chemical ... From English helium, from New Latin helium, from Ancient Greek ἥλιος (hḗlios). ... From New Latin helium, from Ancient Greek ἥλιος (hḗlios, "sun") (because its presence was first theorised in the suns ... Retrieved from "https://en.wiktionary.org/w/index.php?title=helium&oldid=47683381" ...
Copyright / Trademark: If you have a valid legal concern (i.e. copyright or trademark) and would like to request the removal of this application, please use our online notification form. ...
Helium-2 is a hypothetical isotope of helium which according to theoretical calculations would have existed if the strong force ... I have just modified 2 external links on Isotopes of helium. Please take a moment to review my edit. If you have any questions ... Under the subtitle "Helium-2 (diproton)," the contributor suddenly introduces the name "Bradford" - as if we should all know ... so it would most likely decay to 2H in a hypothetical universe where helium-2 is bound. Double sharp (talk) 06:28, 24 October ...
... has role food packaging gas (CHEBI:77974) helium(0) (CHEBI:33681) is a monoatomic helium (CHEBI:33315) ... CHEBI:33681 - helium(0). Main. ChEBI Ontology. Automatic Xrefs. Reactions. Pathways. Models. ...
The Helium Mappers initiative allows community members to measure and log Helium Network coverage. ... The Helium Wallet app allows you to store, send and recieve HNT, Data Credits and Security Tokens as well as manage your ... The Helium Network presents a new opportunity for thousands of businesses that wish to build solutions without the barriers of ... Currently The Helium Network supports only the LoRaWAN wireless protocol, but the blockchain itself is frequency/protocol ...
Isnt it fun to inhale some helium from a balloon to pitch up your voice? This is now also possible with your Windows Phone. ... Isnt it fun to inhale some helium from a balloon to pitch up your voice? This is now also possible with your Windows Phone. ... Just record your voice, then move your finger up or down over the balloon to inhale or exhale helium from the balloon. Its ... Just record your voice, then move your finger up or down over the balloon to inhale or exhale helium from the balloon. Its ...
Because of this decay, the helium content of any mineral or rock capable of retaining helium will increase during the lifetime ... Helium dating, method of age determination that depends on the production of helium during the decay of the radioactive ... the helium dating method is referred to as uranium-thorium-helium dating; if only the alpha-particle emission and helium ... helium. Helium (He). , chemical element, inert gas of Group 18 (noble gases) of the periodic table. The second lightest element ...
1. helium group, series. usage: the series of inert gases. WordNet 3.0 Copyright © 2006 by Princeton University.. All rights ...
Source for information on helium abundance interferometer: A Dictionary of Earth Sciences dictionary. ... An instrument used in remote sensing to determine very precisely the relative abundances of helium and hydrogen in planetary ... helium abundance interferometer (HAD) An instrument used in remote sensing to determine very precisely the relative abundances ... helium abundance interferometer A Dictionary of Earth Sciences © A Dictionary of Earth Sciences 1999, originally published by ...
from helium_client import Helium helium = Helium(/dev/serial0) helium.connect() channel = helium.create_channel(azure_test ... To get started, youll need accounts for both Helium Dashboard and Microsoft Azure IoT along with and an activated Helium Atom. ... This guide walks you through deploying the Helium Azure IoT Channel available within your Helium Dashboard. ... Helium Azure IoT Channel Guide. Azure IoT is Microsofts IoT solution that is part of their Azure Cloud product suite. Its a ...
Lyrics to Helium by Sia: [Verse 1] / Im trying but I keep falling down / I cry out but nothing comes now / Im giving my all ... Cause your love lifts me up like helium. Your love lifts me up like helium. Your love lifts me up like helium. Your love lifts ... Cause your love lifts me up like helium. Your love lifts me up like helium. [Bridge]. You lift me up and I am found. You lift ... Helium Lyrics Languages Arabic Deutsch Greek English Spanish French Italian Japanese Korean Netherlands Portuguese Russian ...
New helium discovery could boost the worlds dwindling supply June 29, 2016 at 10:10 am A new source of helium gas in Africa ... Western Digital Adds Helium-Filled 10TB Drives to Consumer, Business Lines May 23, 2017 at 7:30 am Western Digital is pushing ... Toshibas New 14TB Helium Hard Drive Sets Capacity Records December 11, 2017 at 7:30 am Toshiba is prepping a 14TB ... The iPhone Is Apparently Allergic to Helium November 1, 2018 at 8:15 am Apple devices will fail if used in an atmosphere with ...
Helium is the debut poetry collection by internet phenom Rudy Francisco, whose work has defined poetry for a generation of new ... E-book download Helium. Helium is the debut poetry collection by internet phenom Rudy Francisco, whose work has defined poetry ... Helium. Helium is the debut poetry collection by internet phenom Rudy Francisco, whose work has defined poetry for a generation ... Helium is the debut poetry collection by internet phenom Rudy Francisco, whose work has defined poetry for a generation of new ...
Gusinow, M.A.; Gerber, R.A.; Gerardo, J.B., He3+ and He4+ in 300K Helium Plasmas: Their Effect on Recombination Loss of ... Angus, S.; de Reuck, K.M.; McCarty, R.D., International Thermodynamic Tables of the Fluid State - 4 Helium, Pergamon, New York ... Helm, H., The Mobilities and Equilibrium Reactions of Helium Ions in Helium at 77K, J. Phys. B, 1976, 9, 7, 1171, https://doi. ...
Home , Helium. Helium [1]. Helium is the second-most-abundant element in the universe - only hydrogen is more common. It ... On Earth, helium is mainly mixed with natural gas. And because its lighter than air, if it reaches the atmosphere its likely ... Helium has many scientific uses. It fills the giant balloons that carry telescopes to high altitudes, and pressurizes the fuel ... And the federal government is selling off a major helium reserve its held in the Texas panhandle. So prices have soared. ...
Laser a elio-neon (it); Laser hélium-néon (fr); He-Ne laser (hr); làser dheli-neó (ca); Helium-Neon-Laser (de); Laser Helium- ... Helium-neonlaser (nl); 氦氖雷射 (zh-hant); 氦氖激光 (zh-cn); Láser de helio-neón (es); ليزر الهيليوم نيون (ar); Helium-neon laser (en ... Media in category "Helium-neon lasers". The following 35 files are in this category, out of 35 total. ... Iodine stabilized helium-neon laster, developed by the National Metrology Institute of Japan - National Museum of Nature and ...
This suggests that helium behaves as a metal, at least at the highest pressures encountered in Jupiter and perhaps over a wider ... 2008) Fluid helium at conditions of giant planetary interiors. Proc Natl Acad Sci USA 105:11071-11075. ... Saturn may still the best case for a large effect of helium rain-out, but there is currently no direct and reliable means of ... 2007) Hydrogen-helium mixtures in the interiors of giant planets. Phys Rev B 75:024206. ...
The second lightest element, helium is a colorless, odorless, and tasteless gas that becomes liquid at -268.9 degrees Celsius. ... The boiling and freezing points of helium are lower than those of any other known substance. ... Helium, chemical element, inert gas of Group 18 (noble gases) of the periodic table. ... helium-4 atoms outnumber those of helium-3 about 700,000:1 in atmospheric helium and about 7,000,000:1 in certain helium- ...
Helium (Haskell), Helium (Pram album), Helium (band), Helium (disambiguation), Helium (film), Helium (operating system), Helium ... Phrases that include helium: helium neon laser, liquid helium, helium dating, helium light band, two fluid model for helium, ... helium: Vocabulary.com [home, info] *helium: Macmillan Dictionary [home, info] *Helium, helium: Wordnik [home, info] *helium: ... helium: General Chemistry Online [home, info] *Helium, helium: WebElements Periodic Table of the Elements [home, info] *HELIUM ...
First, the core (full of degenerate helium), will ignite violently in a helium flash - where approximately 6% of the core and ... "helium" after "helios", the Greek word for sun. Helium on Earth wouldnt be discovered for another 10 years, making this party- ... choked off by all this helium and in a last gasp of high pitched mickey mouse voice terror the helium core begins to contract ... Who Discovered Helium?. Scientists have understood for some time that the most abundant elements in the Universe are simple ...
Location: CTAN Packages softmaker-helium softmaker-helium - LaTeX Support files for the SoftMaker Helium fonts. This package ... offers LaTeX support files for the Softmaker Helium fonts (regular + bold), offered (free) from SoftMaker in June 2010, but not ...
China is going to mine the Moon for helium-3 fusion fuel January 26, 2015 at 1:01 pm Chinas space program has been steadily ...
Helium is a colorful and creative, elegant and fresh free WordPress theme. It has a charming and intuitive design that gives ... Try Helium today, and see it for yourself! Features:. *SMT Framework 2.0 ...
Strindberg and Helium. January 19, 2005 3:54 PM Subscribe. The anti-Homestar Runner? posted by funkbrain (26 comments total) 1 ... August Strindberg & Helium. In 1978, the artist and writer Edward Gorey met the members of Monty Python at a fort in Tunisia. ... I have a Helium t-shirt. When I wear it, I cry Heeliuuuuuum. This does not go over well with the Spousal Unit.. posted by ... Has been my rallying call ever since I first saw it (last FPP). I (heart) Helium.. posted by dabitch at 12:28 AM on January 20 ...
"We wanted to craft the perfect BBCOR bat, and the Helium chamber in the new Helium BBCOR Bat granted us this wish," said Jason ... which allows the bat to be filled with compressed Helium gas from the handle to the end cap. Helium guarantees perfect pressure ... The new BBCOR Helium Bat is a limited run of 5,000 units and its released at the same price point of RIP-IT Sports BBCOR AIR ... with the Helium BBCOR I think we are at the beginning of what will be the next evolution in baseball bats.. ...
... the telescope that brought us galactic bubbles and water on Jupiter has run out of liquid helium and will say goodbye ... To detect temperature changes just a few degrees above absolute zero, Herschel had to cool its instruments with liquid helium. ... A dried-up helium supply means it has snapped its last picture. ... Helium drought retires Herschel space telescope. Space 1 May ...
What is helium used for, and where does it come from? Learn facts about this noble gas, including how it causes balloons to ... Helium 101. What is helium used for, and where does it come from? Learn facts about this noble gas, including how it causes ... Helium 101. What is helium used for, and where does it come from? Learn facts about this noble gas, including how it causes ... While helium can be applied in seemingly countless ways, its availability is finite.. Because its lightweight, when helium is ...
Helium-7 and helium-8 are created in certain nuclear reactions. Helium-6 and helium-8 are known to exhibit a nuclear halo. ... With some history of helium. U.S. Geological Survey publications on helium beginning 1996: Helium Where is all the helium? Aga ... Most helium in the universe is helium-4, the vast majority of which was formed during the Big Bang. Large amounts of new helium ... Helium II also exhibits a creeping effect. When a surface extends past the level of helium II, the helium II moves along the ...
Listen to Helium Head now.. Listen to Helium Head in full in the Spotify app ...
Wells in Texas (where the Federal Helium Reserve was established in 1925 near Amarillo), Oklahoma, and Kansas are the principal ... Helium is relatively rare and costly; it typically is produced as a by-product of the extraction of natural gas. ... Helium is abundant in outer space; it makes up about 23% of the mass of the visible universe. It is the end product of energy- ... Helium is relatively rare and costly; it typically is produced as a by-product of the extraction of natural gas. Wells in Texas ...
  • Alpha particles are the nuclei of helium atoms emitted from the nucleus of the radioactive progenitor. (britannica.com)
  • This allows Helium Atoms to have read/write permissions. (helium.com)
  • This suggests that most of Jupiter's interior consists of a mixture of metallic hydrogen fluid (protons in a degenerate electron sea) and neutral helium atoms, with the latter making up about a quarter of the mass but only 7% of the nuclei by number ( Fig. 1 ). (pnas.org)
  • Hydrogen atoms fusing together to create helium powers the sun. (popularmechanics.com)
  • Large amounts of new helium are being created all the time through this same process, where the heat and pressure at the core of stars are causing hydrogen atoms to fuse. (universetoday.com)
  • This stability also accounts for the lack of interaction of helium atoms with each other, which leads to one of he lowest melting and boiling points of all the elements. (universetoday.com)
  • The second group of researchers focused on a Neptune-size world, which shows an outer atmosphere full of speedy helium atoms being blasted away by the host star's high-energy radiation. (livescience.com)
  • This is because nitrogen and oxygen molecules that make up the bulk of air are much heavier than helium atoms, so they don't oscillate back and forth nearly as quickly. (livescience.com)
  • This decay creates alpha particles, which become helium atoms when they capture electrons. (reference.com)
  • Other atoms -- Carbon, Nitrogen, and Oxygen -- would have bonded with Hydrogen (which is reactive) and not with Helium (which isn't) to produce methane, ammonia and water/water vapor. (scienceblogs.com)
  • It will very quickly (in a matter of microseconds) pick up a couple of electrons and become a neutral helium atom, and since Helium atoms don't react with anything, all they'll do is attempt to rise up to the top of the atmosphere. (scienceblogs.com)
  • The team's success was to experimentally demonstrate for the first time that long-lived pionic helium atoms really exists. (mpg.de)
  • However, in pionic helium, it can be conserved in a sense so it lives a thousand times longer than it normally does in other atoms. (mpg.de)
  • Experimental apparatus used to produce and detect pionic helium atoms. (mpg.de)
  • Some of the helium formed seeps up to the Earth's atmosphere which contains about 5 parts per million by volume, but this is a dynamic balance, as the light helium atoms continually escape to outer space. (wikiversity.org)
  • Banks and Holzer [1969] have shown that the polar wind can account for an escape of 2 to 4 x 10^6 ions/cm^2 sec of Helium-4, which is nearly identical to the estimated production flux of (2.5 ±1.5) x 10^6 atoms/cm^2 sec. (infidels.org)
  • The most abundant planetary constituents in the universe are hydrogen and helium. (pnas.org)
  • Scientists have understood for some time that the most abundant elements in the Universe are simple gases like hydrogen and helium. (universetoday.com)
  • Here again we have hydrogen and helium represented by bright lines, while the origin of the remaining bright lines is doubtful. (dictionary.com)
  • The dogma in the field was that the characteristics of hydrogen and helium were different enough that the two wouldn't mix inside giant gaseous planets, Jeanloz said. (redorbit.com)
  • that is telling us a lot about how atmospheres of [some] exoplanets evolve with time, the ones that have an envelope of hydrogen and helium and are close to a star emitting a strong flux in the UV," he added. (livescience.com)
  • Similarly, in the wave mechanical treatment of the scattering of α-particles by hydrogen and helium, the 'α-particle wave' scattered by the nucleus will differ from that scattered by a Coulomb field only by the spherically symmetrical wave scattered by that region (small compared with the wave-length of the incident α-particles) where the interaction energy differs from the Coulomb value. (nature.com)
  • TAYLOR, H. Anomalous Scattering of α-Particles by Hydrogen and Helium. (nature.com)
  • However, if we could go back to when the Solar System was first forming, we'd discover that every planet would have had an atmosphere loaded up with the two most common elements in the Universe: Hydrogen and Helium. (scienceblogs.com)
  • The vast majority of the Hydrogen and Helium would have been confined to the Earth's atmosphere, and quickly would have risen to the uppermost layers. (scienceblogs.com)
  • The relatively large amount of helium produced in rocks may make it possible to extend helium dating to rocks and minerals as young as a few tens of thousands of years old. (britannica.com)
  • But, he said, the computer modeling that predicts the amount of helium the reservoir will be able to produce, considering its complex geology, has determined that the reservoir production rates "will decline to approximately 1 billion cubic feet per year after 2014," he said. (popularmechanics.com)
  • It is in response to the growing concern of the amount of helium that is left and available to us. (infobarrel.com)
  • Instead, we have medium pressure gas cylinders to store helium before liquefaction when the amount of helium collected is high. (mcgill.ca)
  • Young-earth 'proof' #14: The amount of helium in the atmosphere divided by its formation rate on Earth gives only 175,000 years. (infidels.org)
  • A fair amount of helium is lost from the earth's atmosphere by simply being heated up in the elevated temperature of the exosphere (Dalrymple, 1984, p.112). (infidels.org)
  • Vast helium reserves in Tanzania have been discovered that could supply the world with enough helium for several years (assuming we don't celebrate will a LOT of unnecessary balloons). (techdirt.com)
  • Nobel laureate Robert Richardson warned everyone about "peak helium" a few years ago, but party balloons are still cheap -- so it's likely no one will really care about a helium shortage until it's almost too late. (techdirt.com)
  • Whereas we tend to think of Helium as the hilarious gas that does strange things to your voice and allows balloons to float, it is actually a crucial part of our existence. (universetoday.com)
  • Most people know Helium as the lighter-than-air gas that fills our party balloons, but more importantly, it's an irreplaceable element for science and industry. (nationalgeographic.com)
  • And once, Olivia says, "we got balloons full of helium with messages to him and we let them go at night. (dictionary.com)
  • Helium is used to provide lift for balloons and blimps and to create artificial air that will not react chemically. (dictionary.com)
  • Known as helium-3, it is a lightweight isotope of the familiar gas that fills birthday balloons. (popularmechanics.com)
  • This helium cylinder gives you the convenience of filling latex or foil/mylar balloons anytime, anywhere to instantly transform an everyday space into a celebration. (michaels.com)
  • Helium goes into a lot more than balloons. (popularmechanics.com)
  • Illusionist David Blaine, known for extreme stunts and feats of endurance, will attempt to fly above New York City using helium balloons later this month as part of a Youtube livestream event. (theonion.com)
  • You just may not be able to get helium filled party balloons at all. (infobarrel.com)
  • Helium gas is often used to fill balloons. (ehow.co.uk)
  • As long as you don't lose the helium (as balloons do too quickly), I don't think it IS mail fraud. (halfbakery.com)
  • We know of helium, conventionally, as the lighter-than-air gas that we fill balloons, blimps and zeppelins with in order to quickly and easily "defy gravity" here on Earth. (scienceblogs.com)
  • What Are the Dangers of Inhaling Helium Balloons? (ehow.com)
  • One of the biggest problems of inhaling helium balloons is the lack of oxygen. (ehow.com)
  • What Climate Do Helium Balloons Prefer? (ehow.com)
  • Combine this Silver Heart Helium Balloon with latex balloons and ribbons to make a balloon bouquet for use as a table centerpiece, or to hang on the mailbox to let guests know where the party is. (michaels.com)
  • Helium is best known for filling party balloons and making people talk with a squeaky voice. (reuters.com)
  • Helium is extensively used for filling balloons as it is a much safer gas than hydrogen. (wikiversity.org)
  • This Helium Tank Kit includes a 9" metal helium tank with 14.9 cubic feet of helium and fifty 9" latex balloons and ribbon. (orientaltrading.com)
  • You fly using helium balloons and collect stars while watching out for birds and flying ninjas, and try to reach the end of the level. (wiibrew.org)
  • It's not a party without floating helium balloons! (shindigz.com)
  • Latex Balloons: Our Helium Tank will fill approximately forty-five - 9" latex balloons or twenty-five - 11" latex balloons. (shindigz.com)
  • Mylar Balloons: Our Helium Tank will fill approximately twenty-five - 18" mylar balloons or eighteen - 20" mylar balloons. (shindigz.com)
  • Helium is used in magnetic resonance imaging (MRI), fiber optics and semiconductor manufacturing, breathing atmospheres, balloons and leak detection. (thefreedictionary.com)
  • Amid a global helium shortage , Party City announced Thursday it will shutter 45 stores in 2019. (desmoinesregister.com)
  • Although helium occurs in Earth's atmosphere only to the extent of 1 part in 200,000 (0.0005 percent) and small amounts occur in radioactive minerals, meteoric iron , and mineral springs, great volumes of helium are found as a component (up to 7.6 percent) in natural gases in the United States (especially in Texas , New Mexico , Kansas , Oklahoma , Arizona, and Utah). (britannica.com)
  • Ordinary air contains about 5 parts per million of helium, and Earth's crust is only about 8 parts per billion. (britannica.com)
  • Helium does not accumulate in large quantities in the atmosphere because Earth's gravity is not sufficient to prevent its gradual escape into space. (britannica.com)
  • Although helium is the second most abundant element in the universe, most of it in the Earth's atmosphere bleeds off into space. (popularmechanics.com)
  • To be more precise, Helium composes 0.00052% of the Earth's atmosphere by volume. (scienceblogs.com)
  • Oil companies harvest helium trapped deep beneath the Earth's surface, in natural gas chambers. (cnbc.com)
  • Watch the video above to learn more about shortage hitting the earth's helium supply. (cnbc.com)
  • When a lightweight helium atom is heated up, especially Helium-3, which is even lighter than Helium-4, it can easily pick up enough speed to escape Earth's gravity altogether and head off into outer space. (infidels.org)
  • The most probable mechanism for helium loss is photoionization of helium by the polar wind and its escape along open lines of the Earth's magnetic field. (infidels.org)
  • Thus, the helium balance calculations provided by creationist Melvin Cook (which are used by Henry Morris) cannot provide a reliable minimum estimate of the earth's age. (infidels.org)
  • Ultralight helium has no trouble climbing in Earth's atmosphere, which consists mostly of heavy molecular nitrogen and oxygen. (popsci.com)
  • That, combined with gravity that's about a third of Earth's, would send a helium balloon on Mars up and away. (popsci.com)
  • On Earth, helium is only found in substantial quantities in natural reservoirs below the Earth's surface . (dur.ac.uk)
  • Record your voice, have fun with the helium balloon and upload your recording to the cloud. (microsoft.com)
  • Isn't it fun to inhale some helium from a balloon to pitch up your voice? (microsoft.com)
  • Just record your voice, then move your finger up or down over the balloon to inhale or exhale helium from the balloon. (microsoft.com)
  • Most kids would agree: Sucking a lungful of helium out of a balloon makes your voice sound hilarious. (livescience.com)
  • Never inhale helium from a tank or a filled balloon. (ehow.co.uk)
  • Over the next couple of hours, the gondola was moved to the launch position, final checks were completed and inflation of the 12,000 cu. m. helium balloon began. (esa.int)
  • we do not use a balloon to collect helium in our system. (mcgill.ca)
  • ALBUQUERQUE A hot air balloon race based in Albuquerque is suffering a drop in participation due to shortages of helium. (cbsnews.com)
  • Until just recently you could fill a helium balloon for about $3,500. (cbsnews.com)
  • Sullivan said that a helium-only balloon would now cost a competitor about $15,000. (cbsnews.com)
  • We all know that inhaling a little bit of helium from a balloon will cause our voices to sound at a higher pitch. (ehow.com)
  • FYI: Would a Helium-Filled Balloon Float on the Moon? (popsci.com)
  • A helium balloon on the moon might as well be made of lead. (popsci.com)
  • Because atmospheric pressure in the station is kept the same as at sea level on Earth, a helium balloon would have the support it needs to float, but with almost no gravity on the station, there is no force to push up or down on the balloon. (popsci.com)
  • What kid doesn't like a funny, balloon-helium voice? (nypost.com)
  • Uncle Carson was expecting to get a good chuckle out of his infant nephew Lincoln when he made a video of himself taking a big gulp of helium out of a purple balloon. (nypost.com)
  • While historians credit Janssen and Lockyer with the discovery of helium, Sir William Ramsay, a Scottish chemist, as well as two Swedish chemists who worked independently of Ramsay, Nils Langlet and Per Theodor Cleve, were the first to isolate it in the lab. (reference.com)
  • Erected 1968, commemorating the 100th Anniversary of discovery of helium in the gaseous atmosphere surrounding the sun. (hmdb.org)
  • From Wikipedia , The Helium Centennial Time Columns Monument was built in 1968 to commemorate the 100th anniversary of the discovery of helium. (hmdb.org)
  • A start-up exploration company Helium One used our strategy and made a major discovery of helium in the Rukwa area of the East African Rift Valley in Tanzania a few years ago. (dur.ac.uk)
  • A case in point is the recent announcement of the discovery of helium hydride in space, the first molecule purported to have formed in the universe. (answersingenesis.org)
  • A new source of helium gas in Africa could help alleviate the current worldwide shortage. (extremetech.com)
  • Why Is There a Helium Shortage? (popularmechanics.com)
  • A crucial ingredient in MRI machines, wafer manufacturing, welding, and more, helium is experiencing a shortage that's driving up its price around the world. (popularmechanics.com)
  • A new approach to gas exploration has discovered a huge helium gas field, which could address the increasingly critical shortage of this vital yet rare element. (eurekalert.org)
  • Could gas shortage pop WD's helium drive plans? (computerworld.com)
  • On March 26, 1895, Scottish chemist Sir William Ramsay isolated helium on Earth by treating the mineral cleveite (a variety of uraninite with at least 10% rare-earth elements) with mineral acids. (wikipedia.org)
  • The British chemist Sir William Ramsay discovered the existence of helium on Earth in 1895. (britannica.com)
  • And in 1895, while searching for argon, Scottish chemist Sir William Ramsay managed to isolate helium by treating a sample of cleveite with mineral acids. (universetoday.com)
  • Helium can also be used wherever an unreactive atmosphere is needed, e.g., in electric arc welding, in growing crystals of silicon and germanium for semiconductors, and in refining titanium and zirconium metals. (infoplease.com)
  • Previously, terrestrial helium-a non-renewable resource because once released into the atmosphere, it promptly escapes into space-was thought to be in increasingly short supply. (wikipedia.org)
  • Apple devices will fail if used in an atmosphere with trace amounts of helium in it. (extremetech.com)
  • Because it's lightweight, when helium is released in the atmosphere, it floats into space and is lost to Earth forever. (nationalgeographic.com)
  • Helium occurs in natural gas, in radioactive ores, and in small amounts in the atmosphere. (dictionary.com)
  • Researchers modeled the atmosphere based on their observations to determine whether this helium was escaping the planet. (livescience.com)
  • The Carmenes spectrograph can finely measure the wavelength absorbed, which shows when the helium atmosphere is in front of the star and the speed the helium is moving toward Earth - because light turns bluer when it's headed toward us. (livescience.com)
  • Normally, this helium evaporates into the atmosphere and from there dissipates into space. (mcgill.ca)
  • Between the magnet and the 20' stainless steel hose is a valved connection which permits passive boiloff to go through the magnet's standard checkvalve and from there either to the recovery header (standard setup) or to atmosphere (while other magnets are being filled with helium). (mcgill.ca)
  • While the pure hydrogen gas and the helium would have been kicked off the planet relatively quickly by the Sun, the remaining gases would have stuck around for much longer, eventually leaving behind only the heaviest components of our atmosphere. (scienceblogs.com)
  • Helium is the second-most abundant element in the known universe, but it's hard to capture on Earth because of how easily it floats out of the atmosphere and into space. (cnbc.com)
  • A mixture of 80% helium and 20% oxygen is used as an artificial atmosphere for divers and others working under pressure. (wikiversity.org)
  • After the time columns were filled, the caps were welded on and the contents sealed in a helium atmosphere. (hmdb.org)
  • Dr. Dalrymple goes on to explain that even though our understanding of the helium balance in the atmosphere is incomplete, the situation being very complicated because of various hardtocalculate factors, we do know one thing. (infidels.org)
  • it is clear that helium can and does escape from the atmosphere in amounts sufficient to balance production. (infidels.org)
  • Liquid helium existing as a normal fluid between the superfluid transition point of approximately 2.2°K at 1 atmosphere pressure and its boiling point of 4.2°K. (thefreedictionary.com)
  • Gazprom's new helium production facility in East Siberia is scheduled to start producing liquid helium by around 2018. (reuters.com)
  • USPRwire, Fri Oct 12 2018] Liquefied helium is an inert, colorless, non-corrosive, non-inflammable and extremely cold gas. (thefreedictionary.com)
  • This helium-4 binding energy also accounts for why it is a product of both nuclear fusion and radioactive decay. (wikipedia.org)
  • Most terrestrial helium present today is created by the natural radioactive decay of heavy radioactive elements (thorium and uranium, although there are other examples), as the alpha particles emitted by such decays consist of helium-4 nuclei. (wikipedia.org)
  • However, recent studies suggest that helium produced deep in the earth by radioactive decay can collect in natural gas reserves in larger than expected quantities, in some cases, having been released by volcanic activity. (wikipedia.org)
  • Helium dating , method of age determination that depends on the production of helium during the decay of the radioactive isotopes uranium-235 , uranium-238 , and thorium-232 . (britannica.com)
  • Because of this decay, the helium content of any mineral or rock capable of retaining helium will increase during the lifetime of that mineral or rock, and the ratio of helium to its radioactive progenitors then becomes a measure of geologic time . (britannica.com)
  • if only the alpha-particle emission and helium content are measured, the method is called the alpha-helium radioactive clock. (britannica.com)
  • A thermal event that will leave most radioactive clocks relatively unaffected may have a drastic effect on the helium radioactive clock. (britannica.com)
  • In 1903 Ramsay and Frederick Soddy further determined that helium is a product of the spontaneous disintegration of radioactive substances. (britannica.com)
  • The helium that is present on Earth is not a primordial component but has been generated by radioactive decay. (britannica.com)
  • Alpha particles , ejected from the nuclei of heavier radioactive substances, are nuclei of the isotope helium-4. (britannica.com)
  • The unique atomic structure of helium-3 promised to make it possible to use it as fuel for nuclear fusion, the process that powers the sun, to generate vast amounts of electrical power without creating the troublesome radioactive byproducts produced in conventional nuclear reactors. (popularmechanics.com)
  • Although helium only exists in trace amounts on Earth, it is continually produced by the decay of radioactive elements. (reference.com)
  • Radioactive decay causes uranium rock to disperse helium into natural gas chambers over millions of years. (cnbc.com)
  • Usable helium comes instead from the decay of uranium, thorium and other radioactive elements deep underground. (reuters.com)
  • Helium-4 is the product of radioactive alpha decay whereas Helium-3 is primordial. (infidels.org)
  • The second most abundant element in the universe after hydrogen, Helium (symbol He) is a colorless, odorless, nonmetallic gas that is produced abundantly by the nuclear fusion in all stars and is found in smaller amounts on Earth. (dictionary.com)
  • Small quantities of helium-3 previously discovered on Earth intrigued the scientific community. (popularmechanics.com)
  • In recent years, MRI makers have adapted their systems to use smaller quantities of helium and recycle more of it. (reuters.com)
  • Large quantities of helium extracted from natural gas are stored underground northwest of Amarillo, and will provide a valuable source of supply for many years. (hmdb.org)
  • The cryogenic plant used to liquify the gas to make it easier to transport allows removal of the small quantities of helium. (dur.ac.uk)
  • One of the first iPhone 5 battery cases to hit the market, Mophie's Juice Pack Helium sets the bar high, with a sleek, lightweight design that delivers hours of added talk time. (pcmag.com)
  • Are the halo nuclei of 6 He and 8 He the reason they have relatively long half-lives, compared to the other unstable isotopes of helium? (wikipedia.org)
  • The nucleus of every helium atom contains two protons , but, as is the case with all elements, isotopes of helium exist. (britannica.com)
  • The known isotopes of helium contain from one to six neutrons , so their mass numbers range from three to eight. (britannica.com)
  • This event is believed to have produced the majority of helium-4, along with small amounts of the hydrogen, helium and lithium isotopes. (universetoday.com)
  • The nucleus of the helium-4 atom is identical with an alpha particle, two bound protons and neutrons that are produced in the process of alpha decay (where an element decays, releasing mass and becoming something else). (universetoday.com)
  • In 1907, Ernest Rutherford and Thomas Royds demonstrated that an alpha particle is actually a helium nucleus. (universetoday.com)
  • During the process of decay some elements give off a Helium nucleus. (infobarrel.com)
  • But the "alpha particle" is actually the nucleus of a Helium atom! (scienceblogs.com)
  • The team had to find a long-lived state and a very special quantum leap which they could excite with a laser and which would kick the pion into the helium nucleus and destroy the atom. (mpg.de)
  • Although other countries produce helium, the natural gas fields elsewhere around the globe are much less helium-rich than those near Amarillo. (popularmechanics.com)
  • At current production rates of about 2 billion cubic feet per year, the reservoir could continue to produce helium for five to six more years. (popularmechanics.com)
  • The researchers treated clevite, an ore containing uranium, with acid to produce helium. (reference.com)
  • Sept. 1, 1937, ch. 895, 50 Stat. 886 , authorized Bureau of Mines to produce helium gas. (house.gov)
  • Most gas fields do not produce helium in sufficient concentrations to make it worthwhile separating out. (reuters.com)
  • To get started, you'll need accounts for both Helium Dashboard and Microsoft Azure IoT along with and an activated Helium Atom. (helium.com)
  • Helium is the second simplest atom when it comes to its atomic model, following hydrogen. (universetoday.com)
  • A depiction of the atomic structure of the helium atom. (universetoday.com)
  • 3D schematic of a Helium atom. (universetoday.com)
  • There is presently disagreement between theory and experiment as well as between different theoretical calculations concerning the fine-structure splitting of the lowest P state of the neutral helium atom. (psu.edu)
  • After eight years of ongoing research, a group led by Masaki Hori who is a senior physicist at the Max Planck Institute of Quantum Optics in Garching, Germany, now succeeded in a challenging experiment: in a helium atom they replaced an electron with a pion in a specific quantum state and verified the existence of this long-lived pionic helium for the very first time. (mpg.de)
  • The pionic helium atom now enables scientists to study pions in an extremely precise manner with the means of laser spectroscopy. (mpg.de)
  • The helium atom was infected by a pion so to speak which replaces one of the two electrons of the helium atom. (mpg.de)
  • The challenge the team struggled with for eight years was proving that such a pionic helium atom exists in their experiment's tank. (mpg.de)
  • In the helium atom, the pion behaves like a very heavy electron. (mpg.de)
  • In Technical diving where breathing gas mixtures known as Trimix comprising oxygen, helium and nitrogen are used, it is necessary to know the fraction of helium in the mixture to reliably calculate decompression schedules for dives using that mixture. (wikipedia.org)
  • The thermal conductivity of nitrogen and oxygen are very similar, and that of helium very different so that the ratio of oxygen and nitrogen in the mix is relatively unimportant, and need not be compensated. (wikipedia.org)
  • However, for greater accuracy and compensation to oxygen cross-sensitivity, some instruments include an oxygen cell, and in these cases can generally give a full helium and oxygen analysis of the mixture simultaneously. (wikipedia.org)
  • in the analysis of trimix the speed of sound can be described by a non-linear function of temperature, oxygen content and helium content, and thus the content of helium can be determined by measuring the speed of sound through the mix, the temperature of the mix and its oxygen content. (wikipedia.org)
  • When mixed with oxygen in a high pressure environment, helium allows deep sea divers to breathe in the air from their oxygen tanks more easily. (nationalgeographic.com)
  • The spectacular on-pad explosion of a SpaceX Falcon 9 rocket during a pre-launch test Sept. 1 was triggered by a sudden catastrophic breach in a helium pressurization system inside the booster's second-stage liquid oxygen tank, the company said Friday. (cbsnews.com)
  • The buoyant helium bottle shot to the top of the oxygen tank, causing the second stage to break apart, destroying the rocket and a space station-bound cargo ship. (cbsnews.com)
  • At this stage of the investigation, preliminary review of the data and debris suggests that a large breach in the cryogenic helium system of the second stage liquid oxygen tank took place," SpaceX said in a statement. (cbsnews.com)
  • Helium ballons float because they are lighter than oxygen. (ehow.com)
  • When you inhale helium, you are not getting enough oxygen. (ehow.com)
  • explains that when you inhale helium, you aren't getting oxygen and ultimately cannot breath. (ehow.com)
  • Somebody got an alligator breathing a mixture of helium and oxygen, convinced it to bellow, and recorded the results. (talkbass.com)
  • On April 1, scientists at the University of Arizona College of Medicine reported on the invention of a new breathing device that has potential to help patients suffering with lung damage to recover from Covid-19 using a mix of oxygen and helium gases called heliox. (dur.ac.uk)
  • helium abundance interferometer (HAD) An instrument used in remote sensing to determine very precisely the relative abundances of helium and hydrogen in planetary atmospheres by means of an interferometer . (encyclopedia.com)
  • One of the prevailing theories is that droplets of helium condense out of the planets' outer atmospheres and fall to their centers as "helium rain," releasing gravitational energy. (redorbit.com)
  • But two new papers published today (Dec. 6) in the journal Science pinpoint the movement of helium in alien atmospheres from the comfort of our home planet. (livescience.com)
  • In their new paper , Nortmann's group looked for helium in the outer atmospheres of multiple planets. (livescience.com)
  • Twenty years ago, researchers hypothesized that a distinctive wavelength of near-infrared radiation absorbed by helium when light passes through the gas could be used to track the element in distant atmospheres, Nortmann said. (livescience.com)
  • In scientific endeavours NASA uses it in rocket fuel, pressurizing and purging systems, maintaining controlled atmospheres, divers use it (rarely recreational), gas chromatography and the CERN also use Helium as a coolant. (infobarrel.com)
  • Helium (He) , chemical element, inert gas of Group 18 (noble gases) of the periodic table. (britannica.com)
  • Helium is a very stable, safe inert gas that we use for many things from healthcare to manufacturing to science to retail. (infobarrel.com)
  • Helium is widely used as an inert gas shield for arc welding, and as a protective gas for growing silicon and germanium crystals as well as for titanium and zirconium production. (wikiversity.org)
  • Liquid helium is essential for many low temperature applications (see low-temperature physics ), and is used as a coolant in particle accelerators and MRI machines. (infoplease.com)
  • Liquid helium is used in cryogenics (its largest single use, absorbing about a quarter of production), particularly in the cooling of superconducting magnets, with the main commercial application being in MRI scanners. (wikipedia.org)
  • To detect temperature changes just a few degrees above absolute zero, Herschel had to cool its instruments with liquid helium. (newscientist.com)
  • The study, published in this week's online edition of the journal Proceedings of the National Academy of Sciences, demonstrates that metallic helium is less rare than was previously thought and is produced under the kinds of conditions present at the centers of giant, gaseous planets, mixing with metal hydrogen and forming a liquid metal alloy. (redorbit.com)
  • But under the kinds of pressure and temperature found at the centers of Jupiter and Saturn, the researchers found that helium turns into a liquid metal, like mercury. (redorbit.com)
  • at present, the only viscosity measurements on liquid helium have been made in Toronto 1 , and showed that there is a drop in viscosity below the λ-point by a factor of 3 compared with liquid helium at normal pressure, and by a factor of 8 compared with the value just above the λ-point. (nature.com)
  • The important fact that liquid helium has a specific density p of about O.15, not very different from that of an ordinary fluid, while its viscosity μ is very small comparable to that of a gas, makes its kinematic viscosity v=μ/p extraordinary small. (nature.com)
  • The very small kinematic viscosity of liquid helium II thus makes it difficult to measure the viscosity. (nature.com)
  • Lowering and raising this plunger in the liquid helium by means of the thread (4), the level of the liquid column in the tube 3 could be set above or below the level (5) of the liquid in the surrounding Dewar flask. (nature.com)
  • We are making experiments in the hope of still further reducing the upper limit to the viscosity of liquid helium II, but the present upper limit (namely, 10 −9 C.G.S.) is already very striking, since it is more than 10 4 times smaller than that of hydrogen gas (previously thought to be the fluid of least viscosity). (nature.com)
  • Liquid helium is a quiet engine of American research and business. (jewishjournal.com)
  • Yet due in large part to disruptions in the supply chain - particularly the continuing economic isolation of Qatar by many of its neighbors - and unplanned production outages, scientists and engineers across the United States are grappling with shortages and rising prices of liquid helium. (jewishjournal.com)
  • This helium boils off during normal usage, and it boils off at a significantly faster rate during helium refills, when liquid helium is transferred into the NMR magnet dewars. (mcgill.ca)
  • The gas is then purified by passing it through a nitrogen-cooled purifier, and finally it is condensed to liquid helium via a cryocompressor. (mcgill.ca)
  • At this point, the cycle can be completed by transferring the recovered liquid helium into the NMR magnets or the EPR cryostat. (mcgill.ca)
  • One of the recent largest uses for helium has been for pressurizing liquid fuel rockets. (wikiversity.org)
  • Liquid helium is vital for lab and hospital instruments that operate near absolute zero. (aps.org)
  • A new helium liquefaction technology allows "wasted" helium-the warm gas that boils out of an instrument-to be recycled with high efficiency, saving on the cost of liquid helium at labs where a liquefier has previously been too expensive. (aps.org)
  • MRI scanners, NMR machines, and superconducting devices such as SQUIDs require liquid helium to stay cold. (aps.org)
  • So hospitals and laboratories must regularly purchase tanks of liquid helium, the world supply of which has been uncertain in the past few years. (aps.org)
  • These large machines drive helium gas through a compression/expansion cycle to produce liquid helium, similar to a refrigerator. (aps.org)
  • Liquid helium is supplied from Qatar Helium-2 production facility in Ras Laffan with a 20 years SPA to Iwatani Corporation. (thefreedictionary.com)
  • He's breathing air in which nitrogen- the gas which can give people the bends- has been replaced by helium. (npr.org)
  • The term 'low-Btu gas' means a fuel gas with a heating value of less than 250 Btu per standard cubic foot measured as the higher heating value resulting from the inclusion of noncombustible gases, including nitrogen, helium, argon, and carbon dioxide. (house.gov)
  • Professor Chris Ballentine, Department of Earth Sciences, University of Oxford, said: 'We sampled helium gas (and nitrogen) just bubbling out of the ground in the Tanzanian East African Rift valley. (eurekalert.org)
  • The composition of gases that were found naturally seeping from the ground here included 10% helium - significantly more than is generally found in petroleum sources - along with around 90% nitrogen. (dur.ac.uk)
  • Helium-2 is a hypothetical isotope of helium which according to theoretical calculations would have existed if the strong force had been 2% greater. (wikipedia.org)
  • If mining the moon for helium sounds impractical and crazy, it wouldn't be if we could use a specific isotope of helium for a fusion reactor. (techdirt.com)
  • About 54 billion cubic feet of helium might last about 6 years or so at the global consumption rate, but this is the first time anyone has actually gone specifically looking for helium deposits (successfully). (techdirt.com)
  • Some believe that by keeping Helium at higher cost, will encourage people who use it, to maximize their use of it by implementing processes that can capture those small amounts that escape and be put back into the process. (infobarrel.com)
  • Helium is the second lightest and second most abundant element in the observable universe (hydrogen is the lightest and most abundant). (wikipedia.org)
  • And between the two, helium is the second lightest and second most abundant element, being present in about 24% of observable Universe's elemental mass. (universetoday.com)
  • Helium is the 2nd lightest element - second only to hydrogen. (nationalgeographic.com)
  • The Helium is the thinnest and lightest Juice Pack, at 0.59 inch thick and 2.4 ounces, but the case itself is a bit long at 5.49 inches-that's taller than gargantuan 5.4-inch Samsung Galaxy S III , and if you have pants with shallow pockets that could prove a bit problematic. (pcmag.com)
  • I have this one little saying, when things get too heavy just call me helium, the lightest known gas to man. (scienceblogs.com)
  • The government put it there back in 1925 because natural gas produced at the gas fields between Amarillo and Hugoton, Kan., has a very high helium concentration-up to 1.9 percent. (popularmechanics.com)
  • Back in 1925 the United States of America Government started to stockpile Helium under the belief of a future role in air travel. (infobarrel.com)
  • The United States has been the largest producer of helium since 1925, thanks to a massive reserve found across Texas, Oklahoma and Kansas - fittingly named the Federal Helium Reserve. (cnbc.com)
  • Because it is so reactive, helium hydride doesn't exist naturally on earth, and it wasn't produced artificially until 1925. (answersingenesis.org)
  • A Helium analyzer is an instrument used to identify the presence and concentration of helium in a mixture of gases. (wikipedia.org)
  • Helium is contained almost universally in the gases which bubble up with the water of thermal springs. (dictionary.com)
  • He then sent a sample of these gases to two scientists, Lockyer and Sir William Crookes, who were able to identify the helium within it. (wikiversity.org)
  • However, if gas traps are located too close to a given volcano, they run the risk of helium being heavily diluted by volcanic gases such as carbon dioxide, just as we see in thermal springs from the region. (eurekalert.org)
  • Dr Pete Barry, Department of Earth Sciences, University of Oxford, who sampled the gases, added: 'We can apply this same strategy to other parts of the world with a similar geological history to find new helium resources. (eurekalert.org)
  • Because the helium is present at around 10%, it will more efficient to extract than the fractional percentages found among petroleum gases. (dur.ac.uk)
  • Though new private helium production plants are set to come online in the coming years-including a Wyoming plant expected to open later this year-private industry hasn't been as interested in producing helium as Congress hoped. (popularmechanics.com)
  • However, legislative authorisation for sales from the reserve will expire in the next few months, leaving lawmakers scrambling to extend the sales programme temporarily, while putting in place proper price incentives and a market to enable a private helium production industry to flourish in the long term. (reuters.com)
  • The legislation in 1996 says we were supposed to get out of the helium business," says Joe Peterson, the Bureau of Land Management's assistant field manager for helium in Amarillo. (popularmechanics.com)
  • Prices for refined helium sold to end-users have quadrupled from $40 per thousand cubic feet in 2000 to $160 in 2012, according to the U.S. Government Accountability Office, which warned the Natural Resources Committee of the House of Representatives last month of "urgent issues facing the Bureau of Land Management's storage and sale of helium reserves. (reuters.com)
  • The two research teams both used a 3.5-meter (11 feet) telescope in Calar Alto, Spain, to make their measurements - taking advantage of the telescope's powerful CARMENES instrument (short for Calar Alto high- Resolution search for M dwarfs with Exoearths with Near-infrared and optical Échelle Spectrographs) to finely measure the action of helium surrounding the planets. (livescience.com)
  • In this issue of PNAS, Stixrude and Jeanloz ( 4 ) show that band closure in pure helium occurs at lower pressures than previously thought, provided the effect of high temperatures is taken into account. (pnas.org)
  • Following installation by Quantum Technology in April 2021, we are able to collect passive boiloff (boiloff that occurs independently of helium fills) and active boiloff (boiloff during helium fills). (mcgill.ca)
  • Helium is an element which occurs in commercial volume in natural gas produced since 1918 from wells in the Texas Panhandle. (hmdb.org)
  • In future, however, the most promising source of helium is the giant liquefaction plants used to produce LNG. (reuters.com)
  • The hope was by 2015, by the time the reserve was sold down, that new sources of helium would be online and take up the demand. (popularmechanics.com)
  • There are other sources of Helium, they are just not easy to get to. (infobarrel.com)
  • There is urgent need for new sources of helium - something I've been involved with. (dur.ac.uk)
  • The first evidence of helium was observed on August 18, 1868, as a bright yellow line with a wavelength of 587.49 nanometers in the spectrum of the chromosphere of the Sun. The line was detected by French astronomer Jules Janssen during a total solar eclipse in Guntur, India. (wikipedia.org)
  • The first evidence of helium was obtained on August 18th, 1868 by French astronomer Jules Janssen. (universetoday.com)
  • In 1903, large reserves of helium were found in natural gas fields in parts of the United States, which is by far the largest supplier of the gas today. (wikipedia.org)
  • He and his colleagues had previously found that helium starts to have some metal-like qualities in experiments at extremely high pressure, but they have not yet been able to experiment with helium under the conditions found inside giant planets. (redorbit.com)
  • July 26, 1947, ch. 343, title II, §205(a), 61 Stat. 501 , authorized Navy Department to acquire helium-gas lands and to produce and experiment with helium gas. (house.gov)
  • A severe reduction in the availability of helium could force hospitals to replace costly MRI magnets or restrict patient access to them. (popularmechanics.com)
  • Sheldon and Kern [1972] estimated that 20 geomagnetic-field reversals over the past 3.5 million years would have assured a balance between helium production and loss. (infidels.org)
  • The atmospheric concentration of helium, about 5.2 parts per million, is too low to make it economic to extract helium from air. (reuters.com)
  • Large amounts of new helium are being created by nuclear fusion of hydrogen in stars. (wikipedia.org)
  • You're going to need intense amounts of helium to make any noticeable difference, though, aren't you? (halfbakery.com)
  • The helium-filled ball would be about 10.8 g lighter. (halfbakery.com)
  • But instead of an airplane's usual long, thin fuselage it will have a bloated central void that can be filled with helium gas to make the aircraft lighter. (newscientist.com)
  • Quite a simple idea: by replacing the air in bubble wrap with helium, the packages seem lighter when you put them on scales, and so are cheaper to send! (halfbakery.com)
  • Once used only in lighter-than-air craft, helium now serves vital needs in industry, science, and the nation's military and space programs. (hmdb.org)
  • The Helium weighs just 2.4 ounces, slightly lighter than the Air (2.5 ounces) and the Plus (2.9 ounces), and is roughly the same width as the Air and Plus, though it's of course noticeably taller to fit the iPhone 5. (macworld.com)
  • Helium (from Greek: ἥλιος, romanized: helios, lit. (wikipedia.org)
  • He named the element helium from helios, the Greek word for sun. (dictionary.com)
  • The name is derived from the Greek, 'helios' meaning sun, as it was in the sun's corona that helium was first detected. (wikiversity.org)
  • The trace of the isotope helium-3 on Earth is attributable to the negative beta decay of the rare hydrogen-3 isotope ( tritium ). (britannica.com)
  • Furthermore, helium-3 is connected inse- parably with tritium via the tritium decay. (springer.com)
  • Helium is the second-most-abundant element in the universe - only hydrogen is more common. (stardate.org)
  • Helium is the second most abundant element in the universe, created during the Big Bang and found in stars, planets, even our own moon. (nationalgeographic.com)
  • So, they picked helium, the second most abundant element, which comprises five to 10 percent of the universe. (redorbit.com)
  • Helium is an element that is abundant in the Universe and while it is the second most abundant element on Earth, it is a limited supply. (infobarrel.com)
  • The universe is abundant with Helium. (infobarrel.com)
  • Helium was pretty abundant and reasonably inexpensive," the race's founder, Mark Sullivan, told KRQE. (cbsnews.com)
  • The inertness of helium is due to the stability and low energy of it's electron cloud state, where all of its electrons fully occupy 1s orbitals in pairs, none possessing angular momentum and each cancels the other's intrinsic spin. (universetoday.com)
  • One chamber is sealed and is filled with pure helium as the reference gas, and the other receives the sample gas. (wikipedia.org)
  • The full thermodynamic and transport properties of the relevant mixtures cannot be deduced from the behavior of the end members (pure hydrogen and pure helium) and are therefore an area of ongoing research. (pnas.org)
  • Sept. 1, 1937, ch. 895, 50 Stat. 885 , authorized Secretary of the Interior to acquire and reserve helium-gas lands and to produce and store helium gas. (house.gov)
  • The formal discovery of the element was made in 1895 by two Swedish chemists, Per Teodor Cleve and Nils Abraham Langlet, who found helium emanating from the uranium ore, cleveite, which is now not regarded as a separate mineral species but as a variety of uraninite. (wikipedia.org)
  • Two Swedish chemists, Nils Langlet and Per Theodor Cleve, independently found helium in clevite at about the same time as Ramsay. (wikiversity.org)
  • Inhaling helium too fast or from a pressure tank can create helium bubbles in your body. (ehow.com)
  • An article on the Kidz World website, 'How Helium Works,' informs us that inhaling helium too fast or from a pressure tank can create helium bubbles in your body. (ehow.com)
  • On the Oxford and Magnex magnets, the checkvalve is also bypassed during helium fills. (mcgill.ca)
  • Helium is a fascinating element that most people recognize as the stuff that you can inhale to make your voice sound funny. (techdirt.com)
  • The reason most people inhale helium is to change the pitch of their voice. (ehow.com)
  • Slate's 'Is it dangerous to inhale helium? (ehow.com)
  • If you inhale too much helium in a short time, it can result in death. (ehow.com)
  • The federal government, which sets helium prices, announced in April that helium prices would spike from $75.75 per thousand cubic feet (Mcf) in FY 2012 to $84 per Mcf in FY 2013. (popularmechanics.com)
  • Between 10 and 12 billion cubic feet of recoverable helium are expected to remain in the reservoir by the end of 2014, Walter Nelson, director of helium sourcing for Air Products and Chemicals, Inc., told the U.S. Senate Energy and Natural Resources Committee in May. (popularmechanics.com)
  • By combining our understanding of helium geochemistry with seismic images of gas trapping structures, independent experts have calculated a probable resource of 54 Billion Cubic Feet (BCf) in just one part of the rift valley. (eurekalert.org)
  • Most helium in the universe is helium-4, the vast majority of which was formed during the Big Bang. (wikipedia.org)
  • Helium was discovered in 1895 by Sir William Ramsey in London, UK, and independently by Per Theodor Cleve and Nils Langlet in Uppsala, Sweden. (wikiversity.org)
  • The discovery of traces of helium on earth was first announced in 1895. (hmdb.org)
  • Within the Tanzanian East African Rift Valley, volcanoes have released helium from ancient deep rocks and have trapped this helium in shallower gas fields. (eurekalert.org)
  • Helium used for industrial purposes is a byproduct of natural gas production, and the Texas Panhandle is the United States' helium capital. (popularmechanics.com)
  • Almost every known helium reserve on the planet was discovered by accident , and the helium was merely a byproduct of natural gas harvesting. (cnbc.com)
  • Helium was first detected as an unknown, yellow spectral line signature in sunlight, during a solar eclipse in 1868 by Georges Rayet, Captain C. T. Haig, Norman R. Pogson, and Lieutenant John Herschel, and was subsequently confirmed by French astronomer, Jules Janssen. (wikipedia.org)
  • Janssen recorded the helium spectral line during the solar eclipse of 1868, while Lockyer observed it from Britain. (wikipedia.org)
  • However, this process cannot last forever since there is a finite amount of hydrogen in the core of the Sun. So far, the Sun has converted an estimated 100 times the mass of the Earth into helium and solar energy. (universetoday.com)
  • Helium was discovered in 1868 during a solar eclipse. (nationalgeographic.com)
  • From the birth of the Solar System, there's practically no Helium left on Earth. (scienceblogs.com)
  • It is not correct procedure to simply put a helium tank out with the trash when you are finished with it. (ehow.com)
  • It is actually an easy process to properly dispose of a helium tank. (ehow.com)
  • Completely Use The Helium Tank Either use all of the helium in the tank or release all of the helium so that the tank is completely empty. (ehow.com)
  • Properly Secure The Helium Tank Roll the helium tank outdoors, if it is not outdoors already and close the valve as tight as possible. (ehow.com)
  • Disassemble The Helium Tank Unscrew the nozzle on the tank and remove it completely. (ehow.com)
  • Once you do this any residual helium left in the tank can be released by opening the valve. (ehow.com)
  • Also check with the place you purchased the helium tank from, sometimes they will accept the empty tanks. (ehow.com)
  • http://www.ehow.co.uk/facts_7251033_helium-tank-transportation-safety.html. (ehow.co.uk)
  • Helium tank transportation safety" last modified May 13, 2017. (ehow.co.uk)
  • The State Farm commercial that shows Police Officers, Peremedics and driver's involved in a Helium Tank Truck accident Inhaling the Helium laughing saying everything is under control needs to be removed. (thepetitionsite.com)
  • Operator Cindy Sizemore installs a tank to be filled with helium-3, a byproduct of the tritium manufacturing process. (augusta.com)
  • The tank was filled with extremely cold, superfluid helium. (mpg.de)
  • The Helium Espresso Machine also has a large and convenient water tank which helps the user to make coffee just like a Barista would. (walyou.com)
  • Don't forget to add a Helium Tank to your party supplies shopping list. (shindigz.com)
  • This Helium Tank is easy, portable and disposable. (shindigz.com)
  • A $10.00 shipping surcharge, mandated by the delivery company, will be added to your order for each Helium Tank at checkout. (shindigz.com)
  • This suggests that helium behaves as a metal, at least at the highest pressures encountered in Jupiter and perhaps over a wider range of pressures in the many, often much hotter, planets of Jupiter's mass and larger that are now evidently common in the universe ( 5 ). (pnas.org)
  • Helium constitutes about 23 percent of the mass of the universe and is thus second in abundance to hydrogen in the cosmos. (britannica.com)
  • The Sun, like most stars in the Universe, is on the main sequence stage of its life, during which nuclear fusion reactions in its core fuse hydrogen into helium. (universetoday.com)
  • But there is plenty of Helium here on Earth, and it has nothing to do with Helium anyplace else in the rest of the Universe. (scienceblogs.com)
  • This is due to the very high nuclear binding energy (per nucleon) of helium-4, with respect to the next three elements after helium. (wikipedia.org)
  • Helium is concentrated in stars , where it is synthesized from hydrogen by nuclear fusion . (britannica.com)
  • Savannah River Site has replaced and upgraded a 40-year-old system for separating and capturing helium-3, a byproduct of the site's role in the manufacture of tritium for nuclear bombs. (augusta.com)
  • The helium gas is used in radiation detectors operated by the U.S. Department of Homeland Security to detect neutron activity from nuclear material. (augusta.com)
  • Helium doesn't just make your voice squeaky - it is critical to many things we take for granted, including MRI scanners in medicine, welding, industrial leak detection and nuclear energy. (eurekalert.org)
  • Helium is an essential feedstock for numerous industrial, medical, scientific and commercial applications including nuclear power generation, magnetic resonance imaging, industrial fabrication and welding, fundamental sciences and research, fiber optics, space and defence applications, semiconductor manufacturing, and many other applications. (thefreedictionary.com)
  • In scientific research, the behavior of the two fluid phases of helium-4 (helium I and helium II) is important to researchers studying quantum mechanics (in particular the property of superfluidity) and to those looking at the phenomena, such as superconductivity, produced in matter near absolute zero. (wikipedia.org)
  • Federal scientists and researchers operating with a federal grant will have access to the 'in-kind' program, which offers helium at deeply discounted rates. (aps.org)
  • Some researchers have reported that in recent years as much as 70 percent of their grant money has gone towards procuring helium. (aps.org)
  • This summer, researchers at the University of Wisconsin Fusion Technology Institute in Madison reported having successfully initiated and maintained a fusion reaction using deuterium and helium-3 fuel. (popularmechanics.com)
  • This measure tells the researchers if the helium is moving fast enough to escape from the planet. (livescience.com)
  • That helium emanates from the ground in the park is an established fact, Smithsonian Magazine explains, but when researchers dug into the makeup of that helium, what they found was a surprise. (newser.com)
  • in a new study in Nature , US Geological Survey researchers reveal that the emissions of helium-4 'exceed (by orders of magnitude) any conceivable rate of generation within the crust. (newser.com)
  • Researchers found that the park's steam vents and hot springs are releasing hundreds or even thousands of times more helium-4 than we thought-at 60 tons a year, enough to fill a Goodyear blimp weekly, the LA Times reports. (newser.com)