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相关概念视频

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

293
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.
Spin decoupling is usually achieved by...
293
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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Design Example01:23

Design Example

372
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...
372
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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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.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.2K
Encoding01:19

Encoding

247
Information enters the brain through encoding, which is the input of information into the memory system. Once sensory information is received from the environment, the brain labels or codes it. The information is then organized with similar information and connected to existing concepts. Encoding occurs through automatic processing and effortful processing.
Automatic processing involves the encoding of details like time, space, frequency, and the meaning of words, usually done without conscious...
247
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

506
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
506

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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具有基于PCM和PIT效应的编码功能的两到四THz解码装置.

Aijun Zhu, Wenrui Wei, Weigang Hou

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    此摘要是机器生成的。

    这项研究引入了一种新的太赫兹元材料设备. 它独特地结合了等离子体诱导的透明度和相位变换材料,用于先进的2-4解码和2位编码功能.

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    科学领域:

    • 特拉赫兹元材料是什么
    • 塑制剂的使用方法
    • 纳米光子学 纳米光子学

    背景情况:

    • 等离子体诱导透明度 (PIT) 能够实现新的光学功能.
    • 换相材料 (PCM) 提供了对材料属性的动态控制.
    • 太赫兹 (THz) 技术需要先进的设备,用于传感和通信等应用.

    研究的目的:

    • 提出和演示一种新的太赫兹元材料装置.
    • 为了实现 2-4 解码和 2 位编码功能.
    • 为了使得使用温度和费米水平控制的太赫兹设备可以进行主动切换.

    主要方法:

    • 使用太赫兹超材料结构,包括二氧化瓦纳 (VO2) 和石墨烯.
    • 通过温度和费米级调制,积极切换设备的偏振特性和PIT效应.
    • 通过控制中间石墨烯层的费米水平来实现2位编码.
    • 通过调整发生偏振和顶部石墨烯层的费米水平来实现 2-4 解码.

    主要成果:

    • 证明了2位编码功能,最大调制深度 (MD) 为95%,最小灭绝比 (ER) 为10.42dB,插入损失 (IL) 为2.21dB.
    • 实现了 2-4 解码功能,最大的 MD 为 94.50%.
    • 该设备具有可切换的极化特征和PIT效应.

    结论:

    • 拟议的设备集成了PIT和PCM,用于多功能太赫兹应用.
    • 它提供了简单的结构,高集成度和易于调整.
    • 这种设计显著推进了可切换的太赫兹元材料设备的开发.