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相关概念视频

Determination of Crystal Structures01:29

Determination of Crystal Structures

11
In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
11
X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

5.0K
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...
5.0K
X-ray Crystallography02:18

X-ray Crystallography

26.5K
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...
26.5K

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相关实验视频

Updated: Mar 1, 2026

X-ray Powder Diffraction in Conservation Science: Towards Routine Crystal Structure Determination of Corrosion Products on Heritage Art Objects
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X-ray Powder Diffraction in Conservation Science: Towards Routine Crystal Structure Determination of Corrosion Products on Heritage Art Objects

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用于从粉末X射线衍射数据中确定无机晶体结构的等价扩散溶液.

Dongfang Yu1,2, Zhewen Zhu1,2, Fucheng Leng3

  • 1School of Materials Science and Engineering, Zhejiang University, Hangzhou, China.

Nature communications
|February 27, 2026
PubMed
概括
此摘要是机器生成的。

我们开发了一个快速的人工智能模型,从X射线衍射模式确定无机晶体结构,提高材料发现的准确性和速度.

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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: Mar 1, 2026

X-ray Powder Diffraction in Conservation Science: Towards Routine Crystal Structure Determination of Corrosion Products on Heritage Art Objects
09:16

X-ray Powder Diffraction in Conservation Science: Towards Routine Crystal Structure Determination of Corrosion Products on Heritage Art Objects

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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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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.
  • 人工智能的人工智能

背景情况:

  • 确定晶体结构对于理解材料特性至关重要.
  • 从粉末X射线衍射 (PXRD) 数据中解决结构是具有挑战性的,通常需要人工专家解释.
  • 现有的数据库包含许多不完整或不准确的结构模型.

研究的目的:

  • 开发一种自动化方法,从PXRD模式中直接推断原子坐标.
  • 为了显著加快晶体结构溶液的过程.
  • 提高材料数据库中结构模型的准确性和完整性.

主要方法:

  • 开发基于神经网络的等价图形扩散模型.
  • 从PXRD数据直接推断原子坐标,从随机噪声开始.
  • 坐标的代精细化,以产生与实验模式相匹配的化学有效结构.

主要成果:

  • 该模型的成功率很高:模拟数据集的成功率为82.3%,实验数据集的成功率为81.6%.
  • 晶体结构解决方案在单个GPU上平均0.6秒内实现,比以前的方法快了数量级.
  • 成功纠正了39个不利的数据库条目,并完成了912个缺少原子位置的条目.

结论:

  • 开发的AI模型提供了一个强大的和自动化的解决方案,用于从衍射数据中确定晶体结构.
  • 这种方法显著提高了材料表征的速度和准确性.
  • 它为通过闭环系统的自主材料发现铺平了道路.