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Related Concept Videos

Inertial Frames of Reference01:03

Inertial Frames of Reference

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Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with...
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Non-inertial Frames of Reference01:27

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A reference frame accelerating or decelerating relative to an inertial frame is a non-inertial frame. To help understand this, consider what taking off in an airplane, turning a corner in a car, riding a merry-go-round, and the circular motion of a tropical cyclone all have in common. All these systems are accelerating, decelerating, or rotating relative to the Earth; hence, they all are non-inertial frames. All these systems exhibit inertial forces, which merely seem to arise from motion,...
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Chemical Shift: Internal References and Solvent Effects01:17

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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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Members Made of Elastoplastic Material01:19

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The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
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Genetic Material01:20

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Within the human body, a complex and detailed system of trillions of cells works in unison to sustain life. Each cell houses a nucleus, which contains 46 chromosomes divided into 23 pairs. Chromosomes are highly coiled structures made of the genetic material DNA. These chromosomes are essential carriers of genetic information, with half inherited from the mother through her egg and the other half from the father's sperm, combining to create the unique genetic makeup of an individual.
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Bending of Members Made of Several Materials01:11

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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
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Certified Reference Materials and Metrological Traceability for Mycotoxin Analysis.

Zhen Guo1, Xianjiang Li1, Hongmei Li1

  • 1National Institute of Metrology, Division of Metrology in Chemistry, No. 18 East Road of North Third Ring, Chaoyang District, Beijing 100029, China.

Journal of AOAC International
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Summary
This summary is machine-generated.

Metrological traceability is crucial for recognizing measurement results globally. This study analyzes factors like analytical methods and reference materials to ensure accuracy, aiming for "one measurement, global recognition."

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Area of Science:

  • Metrology and Measurement Science
  • Analytical Chemistry
  • Food Safety

Background:

  • Metrological traceability is increasingly vital for mutual recognition of measurement results, driven by international declarations and standards like ISO/IEC 17025.
  • Ensuring accurate measurement results depends on both calibrants and the analytical procedure itself.

Purpose of the Study:

  • To analyze key factors influencing measurement accuracy, specifically for mycotoxin analysis.
  • To highlight the importance of internationally recognized reference materials and analytical methods.

Main Methods:

  • Focuses on analyzing critical factors affecting measurement results in mycotoxin analysis.
  • Illustrates the Capacity Building and Knowledge Transfer Programme for mycotoxins led by the International Bureau of Weights and Measures (BIPM).

Main Results:

  • Identifies analytical methods, reference materials (RMs), and proficiency testing as key factors affecting mycotoxin measurement accuracy.
  • Demonstrates the BIPM's role in establishing a global measurement system traceable to the International System of Units (SI).

Conclusions:

  • Effective use of certified, SI-traceable reference materials is essential for global measurement recognition.
  • Stakeholders must promote the use of globally recognized reference materials to achieve "one measurement, global recognition."