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相关概念视频

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Parallel Resonance01:23

Parallel Resonance

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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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Group Polarization01:01

Group Polarization

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Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
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相关实验视频

Updated: Jan 12, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
09:33

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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极化控制的编码元面,具有相位取消和扩散,用于增强雷达横截面减小.

Muhammad Ubaid Ullah1, Tarik Abdul Latef2,3, Mohamadariff Othman1,4

  • 1Department of Electrical Engineering, Faculty of Engineering, Universiti Malaya (UM), 50603, Kuala Lumpur, Malaysia.

Scientific reports
|November 3, 2025
PubMed
概括

这项研究引入了一种用于宽带雷达截面 (RCS) 减小的新型超表面,实现了显著的信号散射和抑制. 该设计集成了极化转换和相位取消,用于增强电磁波操纵和隐形应用.

关键词:
编码 编码 编码 编码扩散扩散是一种扩散.地表表层的表层.极化转换的转换方式雷达的横截面减少.

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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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相关实验视频

Last Updated: Jan 12, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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科学领域:

  • 电磁学和元材料的使用
  • 应用物理 应用物理
  • 雷达技术 雷达技术的使用

背景情况:

  • 超表面为波浪操纵提供可调节的电磁性质.
  • 降低雷达截面 (RCS) 对隐形应用至关重要.
  • 宽带RCS减少需要复杂的超表面设计.

研究的目的:

  • 开发和验证一种用于宽带RCS减少的新型超表面.
  • 整合偏振转换,扩散和相位取消机制.
  • 为了研究金属表面在正常和斜率下的表现.

主要方法:

  • 一个旋转对称的元表面设计,具有优化的单元细胞大小.
  • 使用Pancharatnam-Berry阶段的1位和2位相控集成.
  • 基因算法 (GA) 对单元细胞排列的优化.
  • 电磁模拟和实验验证.

主要成果:

  • 一位元表面在43.81%的相对带宽 (12.3-19.2 GHz) 上实现了~10 dB的RCS降低.
  • 2位元表面在46.65%的相对带宽 (12-19.3 GHz) 上实现了~20dB的RCS降低,在58.60% (11.1-20.3 GHz) 上实现了~10dB的RCS降低.
  • 在高达15° (1位) 和30° (2位) 的斜发生角下保持了显著的RCS降低.

结论:

  • 拟议的超表面有效地减少了RCS在广泛的频率范围内.
  • 该设计在不同的冲击角度下表现出强大的性能.
  • 这项技术有可能用于先进的隐形和电磁波控制.