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相关概念视频

X-ray Crystallography02:18

X-ray Crystallography

23.7K
The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
23.7K
X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

3.7K
X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
3.7K

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相关实验视频

Updated: May 13, 2025

Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples

Published on: June 19, 2018

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基于遗传算法的几何校准,用于动态压缩的X射线衍射实验.

Nathan P Brown1, Tommy Ao1, Marcus D Knudson1

  • 1Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA.

The Review of scientific instruments
|May 12, 2025
PubMed
概括
此摘要是机器生成的。

一种新的遗传算法方法简化了动态压缩X射线衍射 (XRD) 实验的几何校准. 这种方法可以在复杂的3D设置中准确地确定探测器和晶体的方向,而没有先前的约束.

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Microfluidic Chips for In Situ Crystal X-ray Diffraction and In Situ Dynamic Light Scattering for Serial Crystallography
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Microfluidic Chips for In Situ Crystal X-ray Diffraction and In Situ Dynamic Light Scattering for Serial Crystallography

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High Pressure Single Crystal Diffraction at PX^2
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High Pressure Single Crystal Diffraction at PX^2

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相关实验视频

Last Updated: May 13, 2025

Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples

Published on: June 19, 2018

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Microfluidic Chips for In Situ Crystal X-ray Diffraction and In Situ Dynamic Light Scattering for Serial Crystallography
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Microfluidic Chips for In Situ Crystal X-ray Diffraction and In Situ Dynamic Light Scattering for Serial Crystallography

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High Pressure Single Crystal Diffraction at PX^2
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High Pressure Single Crystal Diffraction at PX^2

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科学领域:

  • 材料科学 材料科学 材料科学
  • 晶体学 晶体学是指结晶学.
  • 高压物理 高压物理

背景情况:

  • 精确分析动态压缩X射线衍射 (XRD) 数据需要精确的几何校准.
  • 由于复杂的优化问题,在3D几何学中确定探测器位置,方向和晶格方向是具有挑战性的.

研究的目的:

  • 开发和介绍一种基于基因算法的强大基因算法方法,用于动态压缩XRD几何校准.
  • 为了克服传统校准优化问题的非线性,不平滑和不连续性.

主要方法:

  • 用于解决几何校准问题的遗传算法的实现.
  • 详细的图像处理和算法实施策略.
  • 开发和部署用于校准的开源软件.

主要成果:

  • 证明了在任意3D散射几何形状中校准探测器和晶体参数的能力.
  • 在不需要先验旋转约束的情况下成功确定晶体方向.
  • 验证了基因算法在处理复杂的XRD校准场景中的有效性.

结论:

  • 遗传算法方法为挑战动态压缩XRD几何校准提供了有效的解决方案.
  • 开发的开源软件有助于在高压材料科学中准确的数据解释.
  • 这种方法提高了动态压缩实验中的结构分析的可靠性.