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相关概念视频

Tension01:10

Tension

12.1K
Tension is a force along the length of a medium, in particular, a force carried by a flexible medium, such as a rope or cable. The word "tension" comes from Latin, meaning "to stretch". Not coincidentally, the flexible cords that carry muscle forces to other parts of the body are called tendons. Any flexible connector, such as a string, rope, chain, wire, or cable, can exert pull only parallel to its length; so, a force carried by a flexible connector is a tension with a...
12.1K
General State of Stress01:21

General State of Stress

183
The general state of stress within a material can be accurately depicted using a stress tensor. This tensor encapsulates the internal forces distributed within a material subjected to external forces or deformations.
Specifically, consider a tetrahedral element where one face, labeled XYZ, is perpendicular to the line OA, and the remaining faces align with the coordinate axes with point O as the origin. At any point, such as point O, the stress tensor can be used to determine the stress...
183
Flexural Stress01:16

Flexural Stress

245
When analyzing bending in symmetric members, it's crucial to understand how stresses distribute when subjected to bending moments. This stress distribution is effectively described by applying fundamental mechanics and material science principles, particularly Hooke's Law for elastic materials.
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to...
245
Speed of a Transverse Wave01:13

Speed of a Transverse Wave

1.5K
The speed of a wave depends on the characteristics of the medium. For example, in the case of a guitar, the strings vibrate to produce the sound. The speed of the waves on the strings and the wavelength determine the frequency of the sound produced. The strings on a guitar have different thicknesses but may be made of similar material. They have different linear densities, and the linear density is defined as the mass per length.
One of the key properties of any wave is the wave speed. Light...
1.5K
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

264
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
264
Cable: Problem Solving01:29

Cable: Problem Solving

327
When dealing with a cable that is fixed to two supports and subjected to uniform loading, it is crucial to determine the maximum tension in the cable. This process can be broken down into several key steps, as outlined below:
327

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Optical Tweezers to Study RNA-Protein Interactions in Translation Regulation
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一个分子表达"线张"的分子表达.

Tejas T Boralkar1, Deepak U Bapat1, Vishwanath H Dalvi1

  • 1Department of Chemical Engineering, Institute of Chemical Technology, Mumbai 400019, Maharashtra, India.

Langmuir : the ACS journal of surfaces and colloids
|May 3, 2024
PubMed
概括
此摘要是机器生成的。

这项研究重新评估了纳米滴接触角度中的"线张力". 分子模拟揭示了它.

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科学领域:

  • 物理化学 物理化学
  • 表面科学是一门学科.
  • 纳米技术纳米技术

背景情况:

  • 方程描述了接触角度,但纳米滴需要像"线张"这样的修改来解释尺寸依赖的接触角度.
  • "线张力"的物理解释仍在争论中,其机械类比存在挑战,并报告了小的,不确定的值.

研究的目的:

  • 用分子模拟来研究"线张"的物理基础.
  • 开发一种新的纳米滴接触角尺寸依赖的模型,而无需调用线张的曲率依赖.

主要方法:

  • 通过分子模拟,系统地分析了三相接触线"线张"与自由能量之间的关系.
  • 方程被重新推导,明确考虑了界面分子.

主要成果:

  • "线张力"与三相线的单位长度的自由能量之间没有直接关系.
  • 一个新的模型被开发出来,解释了纳米滴接触角大小的依赖性,基于接口分子,而不是线曲率.
  • 新模型的近似形式产生了与线张力相似的数量,但具有明确的分子解释.

结论:

  • 传统的概念"线张力"作为由于接触线曲率的恢复力在分子层面上是物理上毫无根据的.
  • 一个新的模型为纳米滴接触角度的尺寸依赖提供了物理解释的解释.