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相关概念视频

Line, Surface, and Volume Integrals01:15

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A line integral for a vector field is defined as the integral of the dot product of a vector function with an infinitesimal displacement vector along a prescribed path. If the prescribed path is closed, the integrals reduce to a closed-line integral. The closed-contour integral of the vector field is referred to in terms of the circulation of the vector field around the closed path. A vector with zero circulation around every closed path is called a conservative field, while one with non-zero...
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Social psychologists have documented that feeling good about ourselves and maintaining positive self-esteem is a powerful motivator of human behavior (Tavris & Aronson, 2008). In the United States, members of the predominant culture typically think very highly of themselves and view themselves as good people who are above average on many desirable traits (Ehrlinger, Gilovich, & Ross, 2005). Often, our behavior, attitudes, and beliefs are affected when we experience a threat to our...
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Virtual Work01:20

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The principle of virtual work states that if a body is in static and dynamic equilibrium, then the sum of all the virtual work done by all external forces and couple moments for any given virtual displacement must be zero.
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Principle of Virtual Work: Problem Solving01:13

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The principle of virtual work is an essential concept in the field of mechanics and engineering. This is used to solve problems related to the equilibrium of a structure or system. It is based on the assumption that if a system is in equilibrium, the work done by all the forces during a virtual displacement is zero. This principle is applied by considering virtual displacements of the system and the corresponding work done by internal and external forces.
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Integration by parts is a fundamental technique in calculus for evaluating integrals involving the product of two functions. It is particularly useful when direct integration is not feasible. The method is based on the product rule for differentiation, which states that the derivative of a product equals the derivative of the first function times the second, plus the first function times the derivative of the second. By integrating this identity and rearranging terms, the integration by parts...
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Integration by Parts: Definite Integrals01:23

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Definite integrals involving the product of two functions over a fixed interval can be evaluated using integration by parts. This method rewrites the integral as the difference of a product evaluated at the endpoints and a remaining definite integral that is often simpler to compute.A representative example is the definite integral of the inverse tangent function. Since there is no direct integration formula for arctan ⁡x, the integrand is rewritten as a product of arctan⁡ x and the...
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相关实验视频

Updated: Feb 12, 2026

Using a Virtual Reality Walking Simulator to Investigate Pedestrian Behavior
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在模拟的表面车外活动期间,用集成的虚拟现实来描述认知工作负载.

Steven R Anderson1, Crystal Kirkley2, Alex J Baughman3

  • 1Behavioral Health and Performance Laboratory, Biomedical Research and Environmental Sciences Division, Human Health and Performance Directorate, NASA Johnson Space Center, KBR, Inc., Houston, TX, United States.

Frontiers in psychology
|February 11, 2026
PubMed
概括

在太空探索期间,高认知工作负载外载活动 (EVA) 会影响机组人员的安全. 在模拟中任务难度增加导致工作量增加,性能降低,生理反应发生变化,突出显示了月球和火星任务的风险.

关键词:
认知工作负载的认知工作负载人类太空飞行的人类太空飞行表面的车外活动.任务执行任务的表现.虚拟现实 虚拟现实 虚拟现实 虚拟现实

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相关实验视频

Last Updated: Feb 12, 2026

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06:38

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科学领域:

  • 人类因素和人体工程学
  • 太空探索技术 太空探索技术
  • 认知心理学 认知心理学

背景情况:

  • 高度的认知工作负载在表面勘探车外活动 (EVA) 期间对机组人员安全构成重大风险.
  • 了解提高认知工作量和影响绩效的特定EVA任务特征对于任务规划至关重要.
  • 目前的研究缺乏关于EVA任务需求和认知工作负载指标之间的关系的明确结论.

研究的目的:

  • 研究模拟表面EVA期间实验操纵的认知工作负载及其对主观工作负载,生理反应和任务执行的影响之间的关系.
  • 确定EVA任务期间认知需求的变化如何影响宇航员的性能和安全.

主要方法:

  • 利用虚拟现实和集成跑步机设置进行扩展现实表面EVA模拟.
  • 雇佣了14名参与者,他们完成了模拟的表面EVA与操纵的认知工作负载,特别不同地质样本识别的难度.
  • 收集了主观认知工作负载评估,生理反应和EVA绩效结果的数据.

主要成果:

  • 增加地质样本识别难度显著增加了主观认知工作量.
  • 认知表现下降,生理反应因更高的认知需求而改变.
  • 增加的认知工作量对关键EVA任务的性能产生了不利影响.

结论:

  • 表面EVA任务的认知需求和认知工作负载的主观/生理指标之间存在明显的关系.
  • 在EVA任务期间的认知需求增加导致EVA总体任务性能下降.
  • 在月球和火星表面探索期间安排和监控关键任务任务时,管理认知工作量至关重要.