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相关概念视频

Design Example: Flow Through a Fire Extinguisher01:12

Design Example: Flow Through a Fire Extinguisher

140
A fire extinguisher that uses pressurized water relies on fluid dynamics principles to generate a high-velocity stream capable of suppressing flames. The water is stored at a much higher pressure inside the extinguisher than the surrounding atmosphere. This pressure difference forces the water to flow rapidly when the extinguisher is activated, and the behavior of the water as it exits the nozzle can be understood using fundamental equations of fluid dynamics.
The key to understanding how the...
140
Design Consideration01:22

Design Consideration

189
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.
The factor of safety is another key...
189
Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

83
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
83
Assessment of Respiration01:23

Assessment of Respiration

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The respiratory system's basic structures and primary functions lay the foundation for nurses' comprehensive respiratory assessments. This assessment includes subjective and objective data to gauge the patient's respiratory health.
Subjective Assessment: Nurses interview the patient to gather information directly during the subjective assessment. It includes questions about the individual's medical history, medications, and symptoms, focusing on past respiratory conditions like...
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Compacting Factor test01:22

Compacting Factor test

163
The compacting factor test is a method used to assess the workability of concrete. It is  especially suitable for concrete mixes containing aggregates up to one and a half inches in size. This test involves specialized equipment consisting of two truncated cone-shaped hoppers and a cylinder, all with polished interior surfaces to minimize friction.
The procedure begins by placing concrete into the upper hopper without any compaction. Once filled, the bottom door of this hopper is opened,...
163
Pulmonary Function Tests01:25

Pulmonary Function Tests

340
Pulmonary Function Tests (PFTs)
Pulmonary Function Tests are crucial diagnostic tools for assessing respiratory function, particularly in patients with chronic respiratory disorders. They comprehensively evaluate lung volumes, ventilatory function, breathing mechanics, diffusion, and gas exchange. These tests help diagnose pulmonary diseases and play a significant role in monitoring disease progression, evaluating disability, and assessing response to therapy.
PFTs involve using a spirometer, a...
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相关实验视频

Updated: Jul 9, 2025

Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames
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结构性消防员工作效率的评估

Emily L Langford1,2,3, Haley C Bergstrom2, Sarah Lanham1,2

  • 1Department of Kinesiology and Health Promotion, First Responder Research Laboratory, University of Kentucky, Lexington, Kentucky.

Journal of strength and conditioning research
|November 28, 2023
PubMed
概括

消防员的工作效率,这是一个结合工作速度和空气消耗的新指标,可靠且具有职业相关性. 专注于代谢耐受性,上半身和有氧耐力训练可以提高消防员的表现.

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Wind Tunnel Experiments to Study Chaparral Crown Fires
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相关实验视频

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Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames
10:29

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Wind Tunnel Experiments to Study Chaparral Crown Fires
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科学领域:

  • 运动生理学 运动生理学
  • 职业健康 职业健康 职业健康
  • 生物机械工程 生物机械工程

背景情况:

  • 消防员 (FF) 需要快速完成任务和高效的自闭式呼吸器 (SCBA) 空气使用,以确保安全和有效性.
  • 现有的绩效指标往往忽略了SCBA的时间限制,只关注工作速度.

研究的目的:

  • 为了评估"工作效率" (WE) 计的可靠性和可变性.
  • 检查WE与代谢应变指标之间的关系.
  • 确定WE的预测因素,包括健身,人体测量和人口统计因素.

主要方法:

  • 79个结构性FF使用SCBA进行了空气消耗演练,使用持续时间和空气消耗计算WE.
  • 一个子样本 (n=44) 用便携式气体分析仪进行了试验.
  • 相关性和多重线性回归分析了WE与健身,人体统计,人口统计和代谢数据的对比.

主要成果:

  • 工作效率 (WE) 证明了可靠性 (ICC=0.71),具有显著的个人间变异性.
  • WE与氧气消耗和潮体积正相关,与通风效率和呼吸频率负相关.
  • 身高,上肢耐力和有氧耐力是WE最强的预测因素.

结论:

  • 工作效率 (WE) 是评估消防员绩效的可靠和职业相关的衡量标准,它结合了工作速率和空气消耗.
  • 旨在提高代谢耐受性,上肢耐力和有氧耐力的有针对性的培训干预措施可以增强消防员的WE.