一个更新的职业噪音工作暴露矩阵:开发和验证

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Updated: Nov 3, 2026

Development of a Nose-only Inhalation Toxicity Test Chamber That Provides Four Exposure Concentrations of Nano-sized Particles
05:07

Development of a Nose-only Inhalation Toxicity Test Chamber That Provides Four Exposure Concentrations of Nano-sized Particles

Published on: March 18, 2019

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Mattias Sjöström1,2, Marie Lewné1, Magnus Alderling1

  • 1Institute of Environmental Medicine, Karolinska Institutet, Solnavägen 4, 10th floor, SE 113 65 Stockholm, Sweden.

Annals of work exposures and health
|December 9, 2023
PubMed
概括

瑞典 (1970-2014) 职业噪音的新定量工作暴露矩阵 (JEM) 已经开发出来. 这种经过验证的工具提高了噪音暴露评估的敏感性,有助于流行病学研究.

关键词:
工作暴露矩阵 (JEM)职业噪音 职业噪音是什么?

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Stress Concentrations01:24

Stress Concentrations

Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller width...
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Stress Concentrations

The concept of stress concentration is crucial for understanding how materials respond under bending stresses, particularly when there are irregularities or discontinuities in the material's geometry. Normally, stress in a symmetric member subjected to pure bending is assumed to be uniformly distributed across the entire cross-section. However, this assumption does not hold when there are variations in the cross-sectional geometry or the presence of notches and holes.
The stress concentration...
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