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相关概念视频

Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

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Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:
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Divergence and Curl of Electric Field01:25

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The divergence of a vector is a measure of how much the vector spreads out (diverges) from a point. For example, an electric field vector diverges from the positive charge and converges at the negative charge. The divergence of an electric field is derived using Gauss's law and is equal to the charge density divided by the permittivity of space. Mathematically, it is expressed as
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When a mechanic tries to remove a hex nut with a wrench, it is easier if the force is applied at the farthest end of the wrench handle. The lever arm is the distance from the pivot point (the hex nut in this case) to the person’s hand. If this distance is large, the torque is higher. Only the component of the force perpendicular to the lever arm contributes to the torque. Therefore, pushing the wrench perpendicular to the lever arm is more advantageous. If multiple people apply force to...
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An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the...
268
Curvilinear Motion: Normal and Tangential Components01:27

Curvilinear Motion: Normal and Tangential Components

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When a car traverses a curved road, its motion can be elucidated by breaking it down into tangential and normal components. The car-centric coordinates attached to the vehicle move with it.
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Updated: Jun 19, 2025

Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers
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梯度和卷曲的光学扭矩.

Xiaohao Xu1,2, Manuel Nieto-Vesperinas3, Yuan Zhou4,5

  • 1State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, 710119, China. xuxiaohao@opt.ac.cn.

Nature communications
|July 23, 2024
PubMed
概括
此摘要是机器生成的。

研究人员发现了两个基本的光学扭矩组件,使物质操纵的新方法成为可能. 这些发现推进了旋转光学机械和结构光应用.

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科学领域:

  • 视觉机械学 视觉机械学
  • 结构光物理 结构光物理
  • 纳米光子学 纳米光子学

背景情况:

  • 光学力和扭矩可以完全操纵物质.
  • 结构光已经揭示了梯度和卷曲力,导致负光学力等现象.
  • 现有的方法专注于转换运动,旋转操纵的研究较少.

研究的目的:

  • 揭示光学扭矩的基本组成部分.
  • 为了介绍和演示侧向光学扭矩.
  • 探索光的轨道角动量与扭矩的合,以进行增强的操纵.

主要方法:

  • 对光的反应螺旋度梯度和动量曲线进行理论分析.
  • 使用结构光的侧向光学扭矩的实验演示.
  • 研究束与光学扭矩的相互作用.

主要成果:

  • 确定了两个基本的光学扭矩组件:反应螺旋梯度扭矩和动量曲线扭矩.
  • 证明了横向光学扭矩与光的旋转交叉作用.
  • 展示了束轨道角动量和卷曲扭矩之间的合,使扭矩增强和负扭矩成为可能.

结论:

  • 发现的扭矩元件与梯度和卷曲力具有旋转相似性.
  • 侧向光学扭矩为横向操纵提供了新的可能性.
  • 这项工作将结构光,Mie-tronics和旋转光学机械联系在一起,在声学和水力动力学方面有潜在的应用.