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相关概念视频

Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
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X-ray Crystallography02:18

X-ray Crystallography

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

X-ray Diffraction of Biological Samples

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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...
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相关实验视频

Updated: Jun 17, 2025

Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography
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对具有强纹理的小粒度多晶体进行X射线张量断层扫描.

Mads Carlsen1, Christian Appel1, William Hearn1

  • 1Photon Science Division Paul Scherrer Institut 5232Villigen PSI Switzerland.

Journal of applied crystallography
|August 7, 2024
PubMed
概括

小角X射线张量断层扫描可以重建样本散射密度. 本研究评估了用于更快的方向变化的算法,并将其测试在钢丝上,以评估复杂纹理的性能.

关键词:
萨克斯 (SAXS) 的时间这是WAXS的.张量断层扫描 (tensor tomography) 是一种张量断层扫描.质地分析,质地分析.广角和小角X射线散射的散射

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Last Updated: Jun 17, 2025

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科学领域:

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

背景情况:

  • 小角X射线张量断层扫描可以重建异型散射密度.
  • 目前的方法通常使用球体波器模拟缓慢的方向变化 (纹理),直至顺序l = 8.
  • 散射密度的更快变化对现有的算法构成了挑战.

研究的目的:

  • 调查已建立的小角度X射线张量断层扫描算法在散射密度有快速方向变化的样品上的性能.
  • 为了比较这些算法的预期和实现的性能.
  • 为了确定张量断层扫描对具有复杂纹理的样品的可行性.

主要方法:

  • 测试已建立的小角度X射线张量断层扫描算法.
  • 使用广角X射线散射数据从已知纹理的钢丝.
  • 基于重建的异型散射密度的真实性来分析性能.

主要成果:

  • 证明了张量断层算法处理散射密度更快变化的能力.
  • 提供了对不同已建立算法的性能进行比较分析.
  • 对具有复杂晶体结构的材料验证了张量断层扫描方法.

结论:

  • 已建立的算法显示出分析具有复杂方向散射特性的材料的前景.
  • 这项研究验证了张量断层扫描方法用于详细的微观结构特征.
  • 进一步的研究可以改进算法,以提高复杂纹理分析的准确性.