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相关概念视频

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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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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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: Jun 24, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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基于太赫兹VO2的动态编码元表面用于双极化,双频段和广角RCS减速.

Ling Wang1,2, Feng Gao1,2, Shuhua Teng1,2

  • 1School of Electronic Information, Hunan First Normal University, Changsha 410205, China.

Nanomaterials (Basel, Switzerland)
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概括

这项研究引入了一种新的太赫兹动态编码元表面,使用二氧化瓦纳 (VO2) 进行有效的雷达截面 (RCS) 减少. 该设备实现了双极化,双频段和广角RCS减速,这对于太赫兹隐形应用至关重要.

关键词:
减少了RCS的减少.编码元地表面的代码.太赫兹 (Terahertz) 是一个频率.二氧化瓦纳二氧化是什么

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相关实验视频

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科学领域:

  • 电磁超材料是一种电磁超材料.
  • 太赫兹技术是太赫兹技术.
  • 隐形技术是一种隐形技术.

背景情况:

  • 目前对雷达截面 (RCS) 减小元表面的研究仅限于微波频段的固定性能.
  • 太赫兹雷达技术的发展需要先进的电磁装置来减少RCS.

研究的目的:

  • 提出一个动态编码的metasurface为太赫兹RCS减少.
  • 为了整合二氧化瓦纳 (VO2) 可调节的电磁性质.
  • 为了实现双极化,双频段和广角RCS减速.

主要方法:

  • 设计和模拟一个包含VO2的太赫兹动态编码元表面.
  • 通过在绝缘体和金属之间切换VO2状态来减少RCS的分析.
  • 在双极化,双频段和广角撞击波下的性能评估.

主要成果:

  • 超表面实现有效的RCS降低从0.18 THz到0.24 THz和0.21 THz到0.39 THz循环偏振波.
  • 在高达40° (极地) 和360° (亚齐木斯) 的入射角度保持10dB的RCS减值.

结论:

  • 拟议的VO2集成动态编码超表面为太赫兹隐形应用提供了显著的潜力.
  • 这种可调节的超表面为太赫兹频谱中的先进电磁设备提供了有前途的解决方案.