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相关概念视频

State Space Representation01:27

State Space Representation

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The frequency-domain technique, commonly used in analyzing and designing feedback control systems, is effective for linear, time-invariant systems. However, it falls short when dealing with nonlinear, time-varying, and multiple-input multiple-output systems. The time-domain or state-space approach addresses these limitations by utilizing state variables to construct simultaneous, first-order differential equations, known as state equations, for an nth-order system.
Consider an RLC circuit, a...
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Plane Electromagnetic Waves I01:30

Plane Electromagnetic Waves I

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The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
The EM field is assumed to be a...
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Plane Electromagnetic Waves II01:29

Plane Electromagnetic Waves II

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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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Generating Electromagnetic Radiations01:10

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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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Electromagnetic Fields01:30

Electromagnetic Fields

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Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
However, the observation of...
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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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相关实验视频

Updated: Mar 17, 2026

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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随机时空编码元表面用于对电磁场时间统计的空间控制.

Jia Cheng Li1, Jiang Han Bao1, Che Liu1

  • 1State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|March 15, 2026
PubMed
概括
此摘要是机器生成的。

这项研究引入了随机的时空编码元表面 (RTCM) 来控制随机的电磁场 (EM). 该框架可用于高级应用程序,准确地分布EM场的统计属性.

关键词:
随机电磁场是随机的电磁场.随机时间空间编码元表面 (RTCM)空间控制 空间控制时间统计的时间统计.

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科学领域:

  • 地表表面技术的技术.
  • 电磁场的控制控制电磁场的控制
  • 统计物理学的统计物理.

背景情况:

  • 传统的数字编码元表面会产生决定性的电磁 (EM) 反应.
  • 控制随机电磁场需要实现目标时间统计属性.
  • 现有的方法缺乏对统计属性的空间分布的控制,例如平均值和方程.

研究的目的:

  • 提出一个新的框架来控制EM场的时间统计属性的空间分布.
  • 为了利用随机的时空编码元面 (RTCM) 进行概率的电磁场结构化.
  • 为了实现同时直接传输和干扰能力.

主要方法:

  • 在概率空间内开发RTCM的统计模型.
  • 确定随机代码分布 (边缘和偶联) 和电磁场统计数据 (平均值和方差) 之间的关系.
  • 使用受目标统计分布限制的采样代码生成时间变化的随机电磁场.

主要成果:

  • 证明了电磁场的空间平均值和方差分布是由随机代码的统计性质决定的.
  • 成功生成了随时变化的随机电磁场,具有所需的空间平均值和方差分布.
  • 展示了通过空间平均值和差异峰值同时进行直接传输和干扰的能力.

结论:

  • 拟议的框架将地表应用扩展到概率领域,从确定性控制转向概率控制.
  • 这项研究为通信系统,信息安全和电磁对策开辟了新的途径.
  • RTCM为先进的电磁场操纵提供了一个强大的新范式.