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相关概念视频

IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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Infrared (IR) Spectroscopy: Overview01:09

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
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IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

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The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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基于阶段的结构质询频域近红外光谱学.

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    此摘要是机器生成的。

    结构化查询 (SI) 增强频域近红外光谱学 (FD-NIRS) 以准确估计组织光学性质. 这种新的方法提高了对更深层组织层的敏感性,有助于婴儿大脑监测.

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    科学领域:

    • 生物医学光学 生物医学光学
    • 频谱学是一种光谱学.
    • 组织光学是组织光学.

    背景情况:

    • 频域近红外光谱 (FD-NIRS) 是一种测量组织光学特性的非侵入性技术.
    • 对光学属性的准确估计对于功能性大脑监测等应用至关重要.
    • 在实现对更深层组织层的高灵敏度和在多层组织中进行准确测量方面存在挑战.

    研究的目的:

    • 引入结构化审讯 (SI) 作为FD-NIRS.的基于干扰的方法.
    • 提高多层组织中的光学属性估计.
    • 提高对更深层组织层的灵敏度,以获得更准确的测量.

    主要方法:

    • 实施了用于FD-NIRS测量的结构化查询 (SI).
    • 在现实的噪声条件下,评估SI在估计光学特性和色孔度方面的性能.
    • 分析了SI FD-NIRS的仅相组件,用于量化光学吸收和散射.

    主要成果:

    • SI FD-NIRS准确估计了光学特性和色素度,在噪声存在时的误差小于5%.
    • SI FD-NIRS的单相组件量化了光学吸收和减少了在同质组织中的散射.
    • 与传统方法相比,SI FD-NIRS在较深的组织中对吸收变化的灵敏度提高了20%.

    结论:

    • 结构化审讯是FD-NIRS的有效基于干扰的方法.
    • SI FD-NIRS提高了准确度和灵敏度,特别是在更深层的组织层.
    • 这种方法有望通过减少表面污染来改善婴儿的功能性大脑监测.