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相关概念视频

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

1.7K
A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
1.7K
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

2.9K
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
2.9K
IR Spectrometers01:25

IR Spectrometers

1.5K
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...
1.5K
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

1.1K
Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
1.1K
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

296
Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
296
Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

1.1K
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,...
1.1K

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相关实验视频

Updated: Sep 12, 2025

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

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路径长度选择性,干扰度分散相关性谱学.

Mitchell B Robinson1, Marco Renna1, Nikola Otic2

  • 1Athinoula A. Martinos Center for Biomedical Imaging Department of Radiology, Massachusetts General Hospital, Harvard Medical School, USA.

IEEE journal of selected topics in quantum electronics : a publication of the IEEE Lasers and Electro-optics Society
|August 6, 2025
PubMed
概括
此摘要是机器生成的。

我们开发了带长度选择性,干涉测量扩散相关谱学 (PaLS-iDCS) 用于增强深层组织血流监测. 这种非侵入性方法可以改善信号噪声比和对深层血液动力学敏感度,而不需要复杂的设备.

关键词:
光学辐射的生物医学应用.血液动力学 血液动力学光学干扰测量是指光学干扰测量.

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Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy
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Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy

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相关实验视频

Last Updated: Sep 12, 2025

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Controlled Synthesis and Fluorescence Tracking of Highly Uniform PolyN-isopropylacrylamide Microgels
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Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy
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科学领域:

  • 生物医学光学 生物医学光学
  • 医疗成像医学成像
  • 光子学是指光子学的使用方法.

背景情况:

  • 扩散相关谱 (DCS) 对于非侵入性血流监测至关重要.
  • 标准的DCS方法对深层组织血液动力学和信号与噪声比 (SNR) 的敏感性有局限性.
  • 现有的增强DCS技术,如时间域DCS (TD-DCS),提供飞行时间 (ToF) 解析,但可能很复杂.

研究的目的:

  • 引入和验证一个增强的DCS方法,路径长度选择性,干扰度DCS (PaLS-iDCS).
  • 提高对深层组织血液动力学和测量SNR的敏感性.
  • 在没有昂贵的时间标记电子设备的情况下提供ToF特定的血流信息.

主要方法:

  • 开发PaLS-iDCS,使用带长度特定的连贯增益和干扰测量检测.
  • 使用蒙特卡洛模拟,幻影实验和人类对象测量与TD-DCS进行比较.
  • 分析SNR,对深层组织血液动力学敏感性和光学属性估计.

主要成果:

  • 与TD-DCS相比,PaLS-iDCS在类似的ToF测量中显示了SNR的2倍以上的改善.
  • 通过SNR的改进,可以在扩展的光子ToF进行测量,使深层血液动力学的灵敏度增加了约50%.
  • PaLS-iDCS允许从ToF分布中直接估计组织光学特性.

结论:

  • PaLS-iDCS提供了一种强大的,非侵入性的血液流量测量方法,对深层组织血液动力学敏感度提高.
  • 该技术提供了ToF特定的血流数据,而不需要时间解析检测.
  • 在深层组织监测中,PALS-iDCS为DCS应用提供了重大进展.