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相关概念视频

Cohesion01:07

Cohesion

51.7K
Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
On a...
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相关实验视频

Updated: Jun 1, 2025

Studying the Neural Basis of Adaptive Locomotor Behavior in Insects
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Studying the Neural Basis of Adaptive Locomotor Behavior in Insects

Published on: April 13, 2011

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提高推进效率,使用生物启发的间歇性移动.

Tristan Aurégan1,2, Mathilde Lemoine1, Benjamin Thiria1

  • 1Laboratoire de Physique et Mécanique des Milieux Hétérogènes, CNRS ESPCI PSL Research University, Université Paris Cité, Sorbonne Université, Paris, France.

Journal of the Royal Society, Interface
|January 21, 2025
PubMed
概括
此摘要是机器生成的。

这项研究表明,间歇性或爆发式推进可以节省螺旋中的能量,类似于鱼类. 折叠螺旋设计是实现高达24%的显著能源节约的关键.

关键词:
爆发和海岸的爆发和海岸.流体结构的相互作用.推进系统 推进系统

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Engineering Platform and Experimental Protocol for Design and Evaluation of a Neurally-controlled Powered Transfemoral Prosthesis
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A Robotic Platform to Study the Foreflipper of the California Sea Lion
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科学领域:

  • 生物仿真推进系统
  • 流体动力学 流体动力学
  • 机器人技术 机器人技术 机器人技术

背景情况:

  • 许多水生动物使用间歇性的"爆发和海岸"运动来提高能源效率.
  • 连续游泳是较大的物种的典型特征,而较小的物种通常使用间歇性策略.

研究的目的:

  • 研究以鱼类运动为灵感的间歇推进的节能效应.
  • 为了比较破裂和海岸周期的能量消耗与螺旋的连续旋转.

主要方法:

  • 开发了一种折叠螺旋,可以通过旋转被动地打开和关闭.
  • 可重新配置的螺旋在爆发和沿海和连续模式中的能量消耗量.
  • 将实验数据与分析模型进行比较.

主要成果:

  • 与连续旋转相比,采用折叠螺旋的间歇推进可以节省高达24%的能量.
  • 积极和被动相之间的大量阻力比对于节能至关重要.
  • 当沿海阶段阻力降低超过65%时,间歇运动更有效.

结论:

  • 可重新配置的螺旋可以通过间歇推进来实现节能.
  • 在螺旋系统和鱼类机动之间,效率的临界阻力降低值不同.
  • 一个正式的类比有助于解释螺旋和鱼类推进机制之间的差异.