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相关概念视频

X-ray Crystallography02:18

X-ray Crystallography

24.2K
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...
24.2K
X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

4.0K
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...
4.0K
Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

2.6K
Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
2.6K

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相关实验视频

Updated: Sep 11, 2025

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

Published on: June 8, 2016

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使用生成模型确定粉末衍射晶体结构.

Qi Li1,2, Rui Jiao3,4, Liming Wu5,6,7

  • 1The Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China.

Nature communications
|August 11, 2025
PubMed
概括
此摘要是机器生成的。

PXRDGen是一种新的AI工具,可以在几秒钟内从粉末X射线衍射 (PXRD) 数据中准确确定晶体结构. 这种人工智能方法简化了复杂结构的确定,使其可用于各种科学领域.

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Derivatization of Protein Crystals with I3C using Random Microseed Matrix Screening
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Derivatization of Protein Crystals with I3C using Random Microseed Matrix Screening

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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene

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相关实验视频

Last Updated: Sep 11, 2025

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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Derivatization of Protein Crystals with I3C using Random Microseed Matrix Screening
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Derivatization of Protein Crystals with I3C using Random Microseed Matrix Screening

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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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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.
  • 计算化学的计算化学

背景情况:

  • 精确的晶体结构确定对于理解材料特性至关重要.
  • 从粉末X射线衍射 (PXRD) 数据中解决晶体结构通常是复杂和耗时的,需要大量的专业知识.
  • 现有的方法经常面临诸如重叠峰和轻原子定位等挑战.

研究的目的:

  • 介绍PXRDGen,这是一个端到端的神经网络,旨在从PXRD数据自动确定晶体结构.
  • 开发一种工具,大大减少PXRD分析所需的时间和专业知识.
  • 使用PXRD数据提高晶体结构精炼的精度和效率.

主要方法:

  • PXRDGen使用了深度学习架构,集成了一个预训练的XRD编码器,一个基于扩散/流的结构生成器,以及一个Rietveld改进模块.
  • 该模型从实验稳定的晶体及其相应的PXRD模式中学习了联合结构分布.
  • 该系统在MP-20数据集上进行训练和评估.

主要成果:

  • 对于MP-20数据集中的有效化合物,PXRDGen实现了创纪录的高匹配率,为82% (1样本) 和96% (20样本).
  • 通过PXRDGen实现的根平均平方误差 (RMSE) 接近传统瑞特维尔德精炼的精度极限.
  • 人工智能模型成功地解决了PXRD分析的挑战,包括重叠的峰值分辨率,光原子定位和邻近元素的差异化.

结论:

  • PXRDGen提供了一个非常准确和快速的解决方案,用于从PXRD数据中确定晶体结构.
  • 由人工智能驱动的方法使晶体结构分析民主化,使其在科学学科中更容易获得.
  • 这种工具有可能通过简化PXRD精炼过程来加速材料发现和研究.