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相关概念视频

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

840
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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Mass Spectrum: Interpretation01:24

Mass Spectrum: Interpretation

1.3K
An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a low-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.
To...
1.3K
Emission Spectra02:39

Emission Spectra

54.4K
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
54.4K
Mass Spectrum01:23

Mass Spectrum

2.0K
A mass spectrum is the graphical representation of the relative abundance of the charged fragments in an analyte plotted against their mass-to-charge ratio (m/z). The plot's x axis represents the ratio of the mass of the charged fragment to the elementary charge it carries. The y axis of the plot represents the relative abundance of each charged species. The relative abundance is calculated from the signal intensity of each charged species recorded at the detector. The most intense signal...
2.0K
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

7.1K
Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent...
7.1K
NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

1.1K
NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
1.1K

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相关实验视频

Updated: Jul 19, 2025

Contrast-Matching Detergent in Small-Angle Neutron Scattering Experiments for Membrane Protein Structural Analysis and Ab Initio Modeling
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SpecUnPy:一个用于中子光谱展开的 Python GUI/App.

Igor Andrade Machado1, Roberto García-Baonza2, Marco Aurélio de Sousa Lacerda1

  • 1Laboratório de Calibração de Dosímetros, Centro de Desenvolvimento da Tecnologia Nuclear, CDTN, Av. Presidente Antônio Carlos, 6627, Pampulha, CEP: 31270-901, Belo Horizonte, MG, Brazil.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine
|August 14, 2023
PubMed
概括

本研究介绍了SpecUnPy,这是一个Python应用程序,用于使用Bonner球谱仪进行中子光谱展开. 它提供多个算法和用户友好的数据出口,用于增强分析.

关键词:
波纳球谱法 波纳球谱法图形化用户界面 图形化用户界面中子子谱法测谱仪中的中子子谱法在这里,Python是Python.展开的代码可以打开.

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科学领域:

  • 核物理 核物理 核物理
  • 辐射检测和测量 辐射检测和测量

背景情况:

  • 波纳球谱仪 (BSS) 是中子谱学的重要工具.
  • 中子光谱通常是通过展开探测器读数得出的.
  • 现有的展开方法可能很复杂,缺乏用户友好的界面.

研究的目的:

  • 介绍SpecUnPy,这是一个新的Python图形用户界面 (GUI) 应用程序,用于中子光谱展开.
  • 为用户提供灵活和可访问的工具来分析BSS数据.
  • 通过性能测试验证 SpecUnPy 应用程序.

主要方法:

  • 开发一个基于Python的GUI应用程序,名为SpecUnPy.
  • 整合了三个不同的展开算法:SPUNIT,最大概率预期最大化 (MLEM) 和GRAVEL.
  • 实现允许无限能源容器和探测器的功能.
  • 允许下载展开的光谱作为 '.xlsx' 文件和图形比较.

主要成果:

  • SpecUnPy成功地实现了SPUNIT,MLEM和GRAVEL的展开算法.
  • 该应用程序支持灵活的数据输入,不限于能量容器或探测器.
  • 生成的输出包括可下载的 '.xlsx' 文件和视觉频谱比较.
  • 最初的测试证实了 SpecUnPy 应用程序的有效性和功能.

结论:

  • SpecUnPy提供了一种多功能和用户友好的解决方案,用于与BSS.的中子光谱展开.
  • 该应用程序增强了中子谱学研究人员的数据分析可访问性.
  • 为了更广泛的适用性,需要进一步验证和潜在的算法扩展.