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Related Concept Videos

Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

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For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
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Atomic Absorption Spectroscopy: Interference01:25

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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
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Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical...
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Measurement of Bioavailability: Pharmacodynamic Methods01:20

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Pharmacodynamic methods provide insights into a drug's effects on physiological processes over time and play a crucial role in understanding bioavailability and therapeutic efficacy. These methods can be broadly classified into acute pharmacological and therapeutic response approaches, each with distinct mechanisms and applications.The acute pharmacological response method directly correlates a drug's physiological effects, such as ECG or pupil diameter changes, to its time course in the body.
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One-Compartment Open Model: Wagner-Nelson and Loo Riegelman Method for ka Estimation01:24

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This lesson introduces two critical methods in pharmacokinetics, the Wagner-Nelson and Loo-Riegelman methods, used for estimating the absorption rate constant (ka) for drugs administered via non-intravenous routes. The Wagner-Nelson method relates ka to the plasma concentration derived from the slope of a semilog percent unabsorbed time plot. However, it is limited to drugs with one-compartment kinetics and can be impacted by factors like gastrointestinal motility or enzymatic degradation.
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Atomic Absorption Spectroscopy: Instrumentation01:22

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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
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Discrepancies of Measured SAR between Traditional and Fast Measuring Systems.

Zicheng Liu1, Djamel Allal2, Maurice Cox3

  • 1Chaire C2M, LTCI, Télécom Paris, 91120 Palaiseau, France.

International Journal of Environmental Research and Public Health
|April 3, 2020
PubMed
Summary

This study investigates discrepancies between traditional and fast specific absorption rate (SAR) measurement systems for mobile devices. Post-processing procedures are key to understanding differences in absorbed energy estimations.

Keywords:
fast SAR measurementfield reconstructionmeasurement discrepancyplane-wave expansionspecific absorption ratetraditional SAR measurementuncertainty analysis

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Area of Science:

  • Electromagnetics
  • Biomedical Engineering
  • Computational Physics

Background:

  • Traditional mobile device exposure assessment uses phantom models and single-probe electric field measurements, which are inefficient due to volumetric scanning.
  • Fast specific absorption rate (SAR) systems aim to improve measurement efficiency but show discrepancies with traditional methods.
  • Understanding these discrepancies is crucial for accurate human exposure assessment.

Purpose of the Study:

  • To investigate the post-processing discrepancies between traditional and fast SAR measurement systems.
  • To analyze the impact of electric field reconstruction algorithms on SAR estimation accuracy.
  • To compare the performance of traditional and fast SAR measurement techniques.

Main Methods:

  • Electric field measurements on a single plane using a probe array in a fast SAR system.
  • SAR estimation based on reconstructed electric fields of the region of interest.
  • Numerical simulations to evaluate discrepancies in post-processing procedures.

Main Results:

  • Fast SAR systems have the potential for more accurate estimations than traditional systems.
  • Discrepancies arise from post-processing procedures, particularly electric field reconstruction.
  • No definitive conclusion on system superiority without knowing field-reconstruction algorithms and source characteristics.

Conclusions:

  • Post-processing algorithms significantly influence SAR measurement accuracy in fast systems.
  • Further research is needed to optimize field-reconstruction methods for fast SAR measurements.
  • Accurate mobile device exposure assessment requires careful consideration of measurement system and algorithm choices.