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相关概念视频

Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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Generation of Three-Phase Voltage01:21

Generation of Three-Phase Voltage

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A three-phase AC generator has a rotor with a rotating magnet placed within the stator mounted with the stationary three-phase winding to generate three-phase voltages via mutual induction. These windings are evenly distributed around the inner circumference of the stator and are arranged 120 electrical degrees apart. Three-phase stator windings consist of three separate coils or groups of coils, known as phases, each connected in Y (star) configuration or Delta configuration.
As the rotor...
752
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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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

3.0K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Electromagnetic Waves01:30

Electromagnetic Waves

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James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws...
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相关实验视频

Updated: Jan 17, 2026

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
07:17

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

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电化学触媒诱导的三相转换用于连续调节的电磁波响应.

Yongbo Yu1, Qian Fei1, Kailing Zhou1,2

  • 1Key Laboratory for New Functional Materials of Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China.

Advanced materials (Deerfield Beach, Fla.)
|September 22, 2025
PubMed
概括
此摘要是机器生成的。

这项研究介绍了一种可调节电磁波屏蔽的新型设备. 该材料具有可控制的导电性和介电性质,提高了先进电子产品的屏蔽效率.

关键词:
子插入的插入.动态调节 动态调节电磁波是一种电磁波.三阶段转换转换的三个阶段.

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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 电气工程 电气工程

背景情况:

  • 电磁波 (EMW) 屏蔽材料在调制灵活性和可靠性方面面临限制.
  • 集成电子需要具有可调节电磁响应的先进材料.

研究的目的:

  • 设计和演示一种用于动态和精确控制电磁波 (EMWs) 的装置.
  • 通过电化学控制研究可调节的电磁屏蔽机制.

主要方法:

  • 一个三明治结构装置的制造:金属网@HxWO3/H2SO4/空洞石墨.
  • 在现场表征和理论模拟.
  • 电化学阴离子间歇和电压管理.

主要成果:

  • 由电压诱导的HxWO3 (单临床到四边形到立方形) 的可逆相位转换.
  • 由于阴离子间隔和二极体形成,提高了导电性和介电性质.
  • 实现了卓越的调制能力 (Δ: 42.36 dB) 和可调的屏蔽强度 (10.9853.34 dB).

结论:

  • 开发的设备提供了显著的技术,用于动态调节电磁波.
  • 该材料的调节性质为苛刻的应用提供了增强的电磁屏蔽效果.