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Fatigue01:21

Fatigue

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Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
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Hazard Rate01:11

Hazard Rate

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The hazard rate, also known as the hazard function or failure rate, is a statistical measure used to describe the instantaneous rate at which an event occurs, given that the event has not yet happened. From a probabilistic perspective, it represents the likelihood that a subject will experience the event in a very small time interval, conditional on surviving up to the beginning of that interval. In terms of frequency, the hazard rate can be viewed as the ratio of the number of events to the...
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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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Relative risk (RR) is a statistical measure commonly used in epidemiology to compare the likelihood of a particular event occurring between two groups. This metric is important for evaluating the relationship between exposure to a specific risk factor and the probability of a particular outcome. It plays a crucial role in medical research, public health studies, and risk assessment. Relative risk quantifies how much more (or less) likely an event is to occur in an exposed group compared to an...
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Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
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Survey Safety

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Surveying near highways, rough terrain, or power lines involves significant risks. Working along highways is particularly dangerous and requires the use of warning signs and flagmen. It is safest to avoid working directly on roads and use offsets whenever possible. When highway work is unavoidable, it must follow all safety guidelines. Surveyors should wear bright clothing, such as orange reflective vests, to ensure visibility to motorists, coworkers, and hunters. In construction zones, wearing...
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Fall Risk is Not Black and White.

Dan K Kiely1, Dae Hyun Kim2, Alden L Gross3

  • 1Institute for Aging Research, Hebrew SeniorLife, Beth Israel Deaconess Medical Center, Boston, MA.

Journal of Health Disparities Research and Practice
|February 9, 2016
PubMed
Summary
This summary is machine-generated.

Racial differences in fall rates among older adults are significantly influenced by health and neighborhood factors. Adjusting for these characteristics substantially reduces disparities in fall incidence between White and Black individuals.

Keywords:
agedelderlyepidemiologyfallshealth disparitiesraceracial differencerisk groupssocioeconomic factors

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Area of Science:

  • Gerontology
  • Public Health
  • Epidemiology

Background:

  • Previous research indicates racial disparities in fall rates among older adults.
  • Understanding the underlying factors contributing to these differences is crucial for targeted interventions.

Purpose of the Study:

  • To investigate whether health status and neighborhood characteristics explain observed racial differences in fall rates between White and Black/African American older adults.
  • To analyze the impact of individual-level and community-level factors on fall incidence across racial groups.

Main Methods:

  • Prospective cohort study involving 550 White and 116 Black older adults in the Greater Boston area.
  • Falls were tracked using monthly calendars and telephone interviews over a mean follow-up of 1,048 days.
  • Baseline assessments included sociodemographic, physiologic, physical activity, and community-level risk factors for falls.

Main Results:

  • Whites had higher rates of any fall, outdoor falls, indoor falls, and injurious falls compared to Blacks.
  • After adjusting for risk factors and community characteristics, the disparity in fall rates between White and Black individuals was substantially attenuated for all fall types except injurious falls.
  • The relative risk for any fall decreased from 1.77 to 1.24, outdoor falls from 1.78 to 1.57, and indoor falls from 1.44 to 1.08.

Conclusions:

  • Racial differences in fall rates appear to be largely confounded by individual-level health status and community-level characteristics.
  • These findings highlight the importance of considering socioeconomic and environmental factors when addressing fall prevention in diverse older adult populations.