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Related Concept Videos

Insufficient Sleep and Sleep Deprivation01:13

Insufficient Sleep and Sleep Deprivation

Insufficient sleep refers to not getting the recommended amount of sleep for optimal functioning, even if it's just slightly less than needed. Sleep insufficiency may occur due to lifestyle choices, such as staying up late for social events or work, resulting in routinely getting less sleep than required. For example, consistently sleeping 6 hours when the body needs 7-9 hours can lead to cumulative effects on health and well-being.
Sleep deprivation is a more severe form of sleep loss...
Effects of Creep01:25

Effects of Creep

Creep in concrete, the gradual deformation under prolonged stress, significantly impacts the integrity of structures. For reinforced concrete beams, it can be a vital design consideration, as it increases deflection, sometimes necessitating additional design measures. In columns, especially slender ones under eccentric loads, creep can cause buckling, compromising their stability. However, creep can be beneficial in indeterminate structures by mitigating stresses that arise from shrinkage,...
Design Consideration01:22

Design Consideration

Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
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Stress Concentrations01:24

Stress Concentrations

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Stress Concentrations01:13

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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.
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Related Experiment Video

Updated: May 12, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
08:36

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Published on: August 8, 2019

Health consequences of shift work and implications for structural design.

M G Figueiro1, R D White

  • 1Lighting Research Center, Rensselaer Polytechnic Institute, Troy, NY 12180, USA. figuem@rpi.edu

Journal of Perinatology : Official Journal of the California Perinatal Association
|March 29, 2013
PubMed
Summary
This summary is machine-generated.

Working rotating shifts negatively impacts health, causing sleep disorders, reduced productivity, and increased risks for chronic diseases like diabetes and cancer. Light can be used to mitigate these adverse effects.

Related Experiment Videos

Last Updated: May 12, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
08:36

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Published on: August 8, 2019

Area of Science:

  • Occupational Health
  • Chronobiology
  • Environmental Design

Background:

  • Rotating shift work is prevalent across many industries.
  • Shift work disrupts the natural circadian rhythm, leading to sleep disorders.
  • Existing research indicates numerous adverse health outcomes associated with shift work.

Purpose of the Study:

  • To review the health consequences of working rotating shifts.
  • To explore implications of shift work for structural and environmental design.
  • To identify countermeasures for mitigating circadian disruption.

Main Methods:

  • A comprehensive literature search was conducted in June 2012.
  • Peer-reviewed articles relevant to shift work and health were selected.
  • The review synthesized findings on health effects and countermeasures.

Main Results:

  • Shift workers experience higher rates of circadian sleep disorders (sleepiness, insomnia).
  • Shift work is linked to decreased productivity, safety concerns, and reduced quality of life.
  • Circadian disruption from shift work increases risks for metabolic syndrome, diabetes, cardiovascular disease, and cancer.

Conclusions:

  • Rotating shift work poses significant health risks, including chronic disease development.
  • Light exposure can serve as a countermeasure to reduce circadian disruption and maintain alertness.
  • Design considerations, particularly regarding lighting in environments like newborn intensive care units, are important for mitigating negative impacts.