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相关概念视频

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Sound as Pressure Waves01:17

Sound as Pressure Waves

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Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
The pressure fluctuation depends on the difference in displacements between the successive points in the...
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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Propagation of Waves01:07

Propagation of Waves

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
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Atomic Nuclei: Nuclear Spin State Overview01:03

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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Sound Waves: Interference00:53

Sound Waves: Interference

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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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在声学中,旋转解析的拓散量状态在声学中.

Mustahseen M Indaleeb1, Sourav Banerjee2

  • 1Integrated Material Assessment and Predictive Simulation Laboratory (i-MAPS), Department of Mechanical Engineering, University of South Carolina, Columbia, SC, 29208, USA.

Scientific reports
|February 9, 2024
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概括

这项研究引入了一种新的拓声学导体,证明了声学能量沉降. 这种现象,与拓绝缘体不同,在散装介质中捕获声能.

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Fabrication and Operation of Acoustofluidic Devices Supporting Bulk Acoustic Standing Waves for Sheathless Focusing of Particles
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科学领域:

  • 声学元材料是一种声学元材料.
  • 拓物理 拓物理
  • 凝聚物质理论 凝聚物质理论

背景情况:

  • 声学中的拓现象通常涉及边缘状态,由量子异常大厅效应 (QAHE),量子谷大厅效应 (QVHE) 和量子旋转大厅效应 (QSHE) 解释.
  • 这些现象依赖于拓绝缘体中的散体边界区分,其中散体是绝缘的,边缘状态是传播的.
  • 现有的模型无法解释大批量内声能被捕获的原因.

研究的目的:

  • 从理论上证明一个具有绝缘边界的拓声学导体.
  • 为了解释一种新的声学能量沉降现象,而不是现有的拓理论所涵盖的.
  • 调查大批声能捕获的潜在机制.

主要方法:

  • 设计的语音晶体 (PnCs) 实现意外的三重退化.
  • 在音频带结构中的 Γ 点创建了一个类似迪拉克的圆.
  • 分析了"聋带"的行为及其对波浪能量传输的影响.

主要成果:

  • 演示了具有绝缘边界的拓声学导体,这是拓绝缘体的反面.
  • 观测到在散装媒体内捕获的声能,独立于微架构和微旋转.
  • 确定波能量不断变化的"上旋转"和"下旋转",导致没有方向传输的被困能量.
  • 展示了由于产生的旋转角运动量而在循环模式中切换几何相.

结论:

  • 呈现的拓声学导体为声能操纵提供了一个新的范式.
  • 这些发现为声能吸收器提供了理论框架,与传统的拓绝缘体不同.
  • 独特的"聋带"和旋转动态为新的声学设备应用提供了潜力.