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相关概念视频

Interference and Diffraction02:18

Interference and Diffraction

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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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Faraday Disk Dynamo01:23

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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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Plane Electromagnetic Waves II01:29

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Consider a plane wavefront traveling in position x-direction with a constant speed. This wavefront can be utilized to obtain the relationship between electric and magnetic fields with the help of Faraday's law.
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The de Broglie Wavelength02:32

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Magnetic Field due to Moving Charges01:23

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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
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Updated: Jan 16, 2026

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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近场动态卡西米尔效应近场动态卡西米尔效应

Renwen Yu1, Shanhui Fan1

  • 1Stanford University, Department of Electrical Engineering, Ginzton Laboratory, Stanford, California, USA.

Physical review letters
|September 26, 2025
PubMed
概括
此摘要是机器生成的。

我们展示了在室温下的极性材料中的动态卡西米尔效应. 这种量子效应甚至在高温下产生非经典的热状态,为纳米级应用开辟了新的途径.

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科学领域:

  • 量子光学就是量子光学.
  • 凝聚物质物理学 凝聚物质物理学
  • 纳米光子学 纳米光子学

背景情况:

  • 动态卡西米尔效应 (DCE) 通常需要冷温度.
  • 近场相互作用显著影响量子现象.

研究的目的:

  • 在有限温度下的时间调制极声系统中研究DCE.
  • 通过DCE探索非经典热态的产生.

主要方法:

  • 开发了一个严格的波动电动力学形式主义.
  • 分析了退化的和非退化的双极子发射过程.
  • 对辐射流进行了非经典性测试.

主要成果:

  • 从量子和热波动中确定了贡献.
  • 由于强烈的近场效应,即使在室温下也观察到占主导地位的量子贡献.
  • 达到了高达250K的非经典光子状态.

结论:

  • DCE可以在低温温度之外进行探索.
  • 可以创建可调节的纳米级非经典热态.
  • 高级DCE允许在较低的调制频率下产生流量.