• Reference is made to the role of atomic absorption spectrometry (AAS), particularly furnace AAS, anodic stripping voltammetry (ASV) as an alternative to the latter and important factors influencing precision and accuracy in trace analysis. (edu.au)
  • Results are presented for optical absorption spectra calculated using the ONETEP code, but the method is equally applicable to other spectroscopies and LS formulations. (springer.com)
  • However, fundamental limitations of existing optical absorption methods result in noisy detection signals for single molecules, which has hindered many anticipated applications. (pnas.org)
  • With our method, we achieve an unprecedented optical absorption sensitivity, enabling the detection of single molecules with large signal-to-noise ratios. (pnas.org)
  • This new measurement method combines the chemical selectivity of optical absorption spectroscopy with the atomic-scale resolution of scanning tunneling microscopy," said Martin Gruebele, a professor of chemistry, physics and biophysics and corresponding author of a paper accepted for publication in the journal Nano Letters, and posted on its Web site. (innovations-report.com)
  • Optical absorption coefficients of a silicon nano-wire are obtained based on a semi-classical model where the photon-electron interaction is described by the interaction of an electromagnetic wave with the electrons in the valence band of a semiconductor. (hindawi.com)
  • The absorption characteristics showed enhanced optical absorption but no resonant peaks. (hindawi.com)
  • The efficiency of a solar cell is dependent on the optical absorption of the material used to fabricate the solar cell. (hindawi.com)
  • Classical models such as Drude model or Drude-Lorentz model describe the optical absorption based on the complex dielectric function [ 1 , 2 ]. (hindawi.com)
  • Dielectric absorption occurs when a capacitor that has been charged for a long time briefly retains a small amount of voltage after a discharge. (circuitcellar.com)
  • While it's certainly best for capacitors to have zero voltage after discharge, they often retain a small amount through dielectric absorption-a phenomenon caused by polarization of the capacitor's insulating material, according to the website. (circuitcellar.com)
  • So columnist Robert Lacoste decided to have some "fun" with it in Circuit Cellar' s February issue , where he writes about several of his experiments in detecting and measuring dielectric absorption. (circuitcellar.com)
  • Figure 1: The setup for experimenting with dielectric absorption doesn't require more than a capacitor, a resistor, some wires and switches, and a voltage measuring instrument. (circuitcellar.com)
  • You have just discovered a phenomenon called dielectric absorption! (circuitcellar.com)
  • After 2 min the voltage reached 119 mV due to the dielectric absorption effect. (circuitcellar.com)
  • Nothing in Lacoste's column about experimenting with dielectric absorption is shocking (and that's a good thing when you're dealing with "hidden" voltage). (circuitcellar.com)
  • To learn more about dielectric absorption, what causes it, how to detect it, and its potential effects on electrical systems, check out Lacoste's column in the February issue. (circuitcellar.com)
  • The following specification discloses a current noise and dielectric absorption kickback compensation circuit for a force line and a sense line that are to be initially compensated with regard to unwanted currents therein. (freepatentsonline.com)
  • The invention compensates for spurious signals which are mutually incurred on the force and sense lines through dielectric absorption kickback and noise generated thereon, such as sixty cycle ambient noise. (freepatentsonline.com)
  • The nulling effect compensates for noise, and dielectric absorption kickback that is caused by the switching matrices and the ambient noise, so that a true current reading on the force line can take place as to any current thereon that relates to the device under test. (freepatentsonline.com)
  • Stone Mountain Tech. Inc. is developing a gas-fired absorption heat pump that offers a significant advancement for space and water heating technologies when compared to conventional gas heating technologies (an Annual Fuel Utilization Efficiency (AFUE) of 140% versus 100%, respectively). (energy.gov)
  • A ) Equal absorption and emission due to reciprocity leads to efficiency limitations in thermophotovoltaic systems, and similarly limits the performance of communication systems. (pnas.org)
  • But as the dose increases above that level, absorption efficiency declines. (orlandosentinel.com)
  • The novAA 800 series (https://t1p.de/io70) is a family of small footprint benchtop atomic absorption spectrometers for highest efficiency in routine analysis that covers the complete range of AAS applications from flame to graphite furnace to hydride mode on one instrumental platform. (environmental-expert.com)
  • Absorption cooling topics are discussed in this webinar, including crystallization, higher cost, lower efficiency and operational flexibility. (york.com)
  • For references , please go to https://www.eea.europa.eu/help/glossary/eea-glossary/absorption or scan the QR code. (europa.eu)
  • In this article, these studies are systematically examined, as are studies of the effects of chronic PPI use on absorption of VB 12 , iron, and magnesium. (springer.com)
  • The purpose of this study was to measure magnesium absorption over the wide range of intakes to which the intestine may be exposed from food and/or magnesium-containing medications. (jci.org)
  • Net magnesium absorption was measured in normal subjects after they ingested a standard meal supplemented with 0, 10, 20, 40, and 80 mEq of magnesium acetate. (jci.org)
  • Although absorption increased with each increment in intake, fractional magnesium absorption fell progressively (from 65% at the lowest to 11% at the highest intake) so that absorption as a function of intake was curvilinear. (jci.org)
  • Our results are statistically compatible with a magnesium absorption process that simultaneously uses a mechanism that reaches an absorptive maximum, plus a mechanism that endlessly absorbs a defined fraction (7%) of ingested magnesium. (jci.org)
  • In contrast, magnesium absorption from commercially available enteric-coated magnesium chloride was much less than from magnesium acetate, suggesting that enteric coating can impair magnesium bioavailability. (jci.org)
  • What is different about high-absorption magnesium supplements? (reference.com)
  • Unlike normal magnesium supplements, high-absorption magnesium supplements are usually dissolved in a liquid, or they are in the aspartate, citrate, lactate or chloride form, reports The National Institute of Health. (reference.com)
  • Wherever absorption occurs, heat energy is generated. (universetoday.com)
  • Astronomers have captured the strongest evidence yet that the growth of high-mass stars occurs by the rapid absorption of hot gas and not by the collision of several smaller stars. (scientificamerican.com)
  • Higher absorption occurs among individuals who are deficient in a mineral, while some elements in the diet (e.g., oxalic acid or oxalate in spinach) can decrease mineral availability by chemically binding to the mineral. (faqs.org)
  • Smoking and insulin absorption. (bmj.com)
  • Williams G , Pickup J . Smoking and insulin absorption. (bmj.com)
  • The effect of lipohypertrophy at injection sites on insulin absorption has been studied in 12 insulin-dependent diabetic patients. (diabetesjournals.org)
  • A Measurement Method for Determining Absorption Coefficients! (cdc.gov)
  • Impedance tube testing is an inappropriate method for determining underground absorption coefficients due to the brittle composition of some of the materials such as coal and slate. (cdc.gov)
  • This paper will present a method using a ray-tracing technique to determine absorption coefficients for underground mines. (cdc.gov)
  • Absorption coefficients are determined and presented for octave bands from 63 Hz to 8 kHz. (cdc.gov)
  • The absorption coefficients will be essential for determining and predicting potential overexposure to machine operators in different mine environments. (cdc.gov)
  • 88-14) This invention relates to analytical apparatus and more particularly to absorption spectral apparatus for quantitative analysis of materials which strongly absorb radiant energy of particular wave lengths in the ultraviolet, visible or infrared spectral regions. (google.com)
  • It is an object of this invention to provide an analytical apparatus for analyzing materials in accordance with absorption spectral principles. (google.com)
  • The analytical formula for ultrasound absorption in magnetic nanofluid with prolate ellipsoids aggregates is derived. (nsti.org)
  • Zacarías León's thesis describes the development and validation of analytical methods to estimate the processes set in motion by percutaneous absorption of UV filters in sunscreen cosmetic products. (springer.com)
  • Despite the existence of many competitive analytical techniques, molecular absorption spectrophotometry still remains very popular in practice, particularly in biochemical, clinical, organic, agricultural, food and environmental analyses. (elsevier.com)
  • Absorption microscopy is a promising alternative to fluorescence microscopy for single-molecule imaging. (pnas.org)
  • To reduce the noise, the researchers combined several special techniques -- each insufficient by itself -- into a method that allows them to detect single molecule absorption under laser illumination by scanning tunneling microscopy. (innovations-report.com)
  • If absorption rises, reflectivity becomes smaller and thin sheets of metal (like e.g. gold or copper) become partially transparent in the frequency region where they absorb. (physicsforums.com)
  • This fuel-driven solution utilizes a simple single-effect ammonia-water absorption cycle. (energy.gov)
  • Intertek provides water absorption verification of structured core materials by ASTM C272. (intertek.com)
  • Test method is applied for structural core materials such as honeycomb or foam and covers the determination of water absorption when immersed or in high relative humidity environments. (intertek.com)
  • Those digestive enzymes break down dietary fat, enabling the rapid absorption of calorie-dense foods. (eurekalert.org)
  • i noticed though that reflectivity peak say at 3eV will correspond to a absorption peak (in the complex dielectric) at about 3eV too. (physicsforums.com)
  • The SAR value is then measured at the location that has the highest absorption rate in the entire head, which in the case of a mobile phone is often as close to the phone's antenna as possible. (wikipedia.org)
  • So far, molecular absorption has been probed optically via the attenuation of a probing laser or via photothermal effects. (pnas.org)
  • Experimental results for ultrasound absorption anisotropy in dodecane-based magnetic nanofluid are first demonstrated and they manifest the ultrasound absorption resonance at certain angle between wave vector and external magnetic field direction. (nsti.org)
  • During idle, two different methods are applied: (1) a direct spectroscopic emission-absorption technique at a resonance line of potassium, seeded to the air stream to generate sufficient spectral absorptance ('colouring' technique), and (2) a more standard, indirect method in which temperatures are derived from pressure recordings using a two-zone thermodynamic model. (sae.org)
  • An insufficiently studied area receiving much attention is the long-term effect of chronic acid suppression on the absorption of vitamins and nutrients. (springer.com)
  • For example, the human corneal orb is a unique in vitro permeability model available as a service platform only through Absorption Systems. (prweb.com)
  • The corneal orb, cultured from human pluripotent stem cells, was developed by Lifeline Cell Technology, Inc., a wholly-owned subsidiary of International Stem Cell Corporation, and has been validated by Absorption Systems as an in vitro corneal permeability test system. (prweb.com)
  • The CellPort Technologies® platform, a suite of human cell-based test systems for drug transporter characterization, exemplifies Absorption Systems' commitment to innovation and is soon to be an industry assay standard for in vitro drug interaction assessment. (prweb.com)
  • Wikisource has the text of the 1921 Collier's Encyclopedia article Absorption . (wikipedia.org)
  • In general, radiation within the spectral range of 220 millimicron to microns, which includes the ultraviolet, visible and infrared regions can be used in absorption spectral analysis. (google.com)
  • The absorption spectral apparatus of this invention is particularly useful for quantitative analysis employing infrared radiation and will be described in detail hereinafter with specific reference to various embodiments designed for use in this spectral region. (google.com)
  • Timofeyev, Y. & Tonkov, M. Effect of the induced oxygen absorption bond on the transformation of radiation in the 6 μm region. (nature.com)
  • When the energy of incident radiation is less than the band gap energy of a semiconductor (typically 1 eV), free carrier absorption (electrons in the conduction band and holes in the valence band) takes place. (hindawi.com)
  • Field R.W. (1988) Distillation and Absorption. (springer.com)