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相关概念视频

Quantifying Work02:30

Quantifying Work

As a system undergoes a change, its internal energy can change, and energy can be transferred from the system to the surroundings, or from the surroundings to the system.
Work Done During Volume Change01:17

Work Done During Volume Change

In mechanics, work is done on an object when the force acting on it displaces the object. In thermodynamics, work done on a system can be estimated when the system's volume changes during any thermodynamic process.
Consider a gas confined to a cylinder fitted with a movable piston at one end. If the gas expands from volume V1 to volume V2, it exerts a force on the piston, such that the piston moves by a distance dr.
The work done by the gas on the piston can be expressed as
Fluid Movement Between Compartments01:18

Fluid Movement Between Compartments

The force applied by fluids against a surface, known as hydrostatic pressure, initiates the transfer of fluid among different compartments. Within our blood vessels, the blood's hydrostatic pressure is a result of the heart's pumping action. At the arteriolar end of capillaries, hydrostatic pressure (capillary blood pressure) exceeds the opposing colloid osmotic pressure created primarily by plasma proteins like albumin. This discrepancy in pressure propels plasma and nutrients from the...
Conservation of Mass in Fixed, Nondeforming Control Volume01:07

Conservation of Mass in Fixed, Nondeforming Control Volume

The principle of conservation of mass is fundamental in fluid dynamics and is crucial for analyzing flow within fixed control volumes, such as pipes or ducts. This principle states that the total mass within a control volume remains constant unless altered by the inflow or outflow of mass through the control surfaces. This results in a vital relationship for steady, incompressible flow where the mass entering a system equals the mass leaving it.
In the case of a sewer pipe, which can be modeled...
Conservation of Mass in Moving, Nondeforming Control Volume01:14

Conservation of Mass in Moving, Nondeforming Control Volume

Stormwater detention basins are essential in managing runoff during heavy rainfall, particularly in urban areas where impervious surfaces increase the risk of flooding. Understanding the conservation of mass in these systems allows engineers to optimize basin performance, balancing inflow, outflow, and water storage.
In the context of a detention basin, the conservation of mass states that the total mass of water entering the basin must equal the mass leaving the basin plus any accumulation of...
Rapidly Varying Flow01:24

Rapidly Varying Flow

Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...

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相关实验视频

Updated: Jul 1, 2026

Kinematic Analysis Using 3D Motion Capture of Drinking Task in People With and Without Upper-extremity Impairments
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在关键功能任务中量化截肢者的运动流性.

Amy Edwards1,2, Terry Fawden3, Iwan Vaughan Roberts3

  • 1Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom.

Physiological measurement
|September 15, 2025
PubMed
概括
此摘要是机器生成的。

使用仪器方法的客观运动分析可以量化下肢截肢者坐到站 (STS) 和坐到走 (STW) 的流性. 这种方法比传统方法提供了更客观的评估,有助于康复和功能恢复.

关键词:
截肢受争议的人.犹犹犹犹犹犹犹犹运动分析,运动分析.坐到站的时间.坐到走路的时间它们的光滑性和光滑性.

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科学领域:

  • 生物力学和运动科学 生物力学和运动科学
  • 康复工程 康复工程
  • 假肢和整形手术

背景情况:

  • 坐到站 (STS) 和坐到走 (STW) 是下肢截肢后独立的关键功能运动.
  • 物理治疗师对运动流 (犹,平滑) 的当前临床评估是主观的,取决于经验.
  • 需要客观,可扩展的定量测量来准确评估截肢者的运动流性.

研究的目的:

  • 建立一个客观的,可访问的,可扩展的定量测量转肢截肢者的运动流性.
  • 使用仪器分析,区分社区门诊人员,有限社区门诊人员和典型个体之间的运动流性.
  • 评估在STS和STW任务期间的犹和顺.

主要方法:

  • 使用仪器运动分析来量化运动流性.
  • 十二名腿骨移植截肢者 (六名社区,六名有限社区门诊人员) 和六名典型的个人执行了STS,STW和行走任务.
  • 发表的算法被用来评估STS和STW运动中的犹和顺.

主要成果:

  • 在三组中观察到STW犹和平滑的统计学上显著差异.
  • 与有限的社区门诊医生相比,社区门诊医生在STW中表现出明显较少的犹和更高的流性.
  • 与典型的个人相比,社区行走者在STW中表现出显著更多的犹和不那么平滑,并且走得更慢.

结论:

  • 在STS和STW等功能任务中量化运动流性为截肢者评估提供了超越步行速度的宝贵见解.
  • 客观的运动分析可以区分截肢群体之间的功能能力,并跟踪康复进展.
  • 这些发现支持使用仪器运动分析来理解功能恢复和分类肢体损失后的截肢者.