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相关概念视频

Gauss's Law: Cylindrical Symmetry01:20

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A charge distribution has cylindrical symmetry if the charge density depends only upon the distance from the axis of the cylinder and does not vary along the axis or with the direction about the axis. In other words, if a system varies if it is rotated around the axis or shifted along the axis, it does not have cylindrical symmetry. In real systems, we do not have infinite cylinders; however, if the cylindrical object is considerably longer than the radius from it that we are interested in,...
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Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
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Electrostatic Boundary Conditions in Dielectrics01:27

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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
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Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
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Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
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相关实验视频

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Magnetic Resonance Derived Myocardial Strain Assessment Using Feature Tracking
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在3D-EBSD中使用连贯双边界作为内部引用的对齐算法.

Heng Li1,2, Shuang Xia1,2, Qin Bai1,3

  • 1School of Materials Science and Engineering, Shanghai University, Shanghai, PR China.

Journal of microscopy
|August 16, 2024
PubMed
概括
此摘要是机器生成的。

一个新的对齐算法改进了从电子反向散射衍射 (EBSD) 数据的3D微结构重建. 这种方法提高了在316L奥氏体不钢中区分双边界的准确性.

关键词:
316L不钢是一种不钢.3D-EBSD 3D-EBSD是什么意思调整对齐的情况连续切割的系列切割.双胞胎的边界是双胞胎的边界.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 金工业是金工业的一个方面.
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 三维 (3D) 微结构重建对于理解材料特性至关重要.
  • 连续切割与电子背散射衍射 (EBSD) 映射相结合,是3D微观结构分析的常见技术.
  • 邻近的2D部分之间的翻译错位可以显著阻碍准确的3D重建.

研究的目的:

  • 开发一种新的对齐算法,以提高3D微结构体积重建的精度,从序列分割EBSD数据.
  • 解决和减少3D-EBSD数据集中的翻译错位问题.
  • 加强在316L奥氏体不钢中连贯和不连贯的双边界之间的区别.

主要方法:

  • 从通过串行切割和EBSD映射获得的2D截面重建一个3D微结构体积.
  • 开发和应用新的调整算法:通过最小化指标 (LTMI) 进行线性翻译.
  • 使用 {111} 平面上的连贯双边界作为对齐的参考,最大限度地减少 {111} 平面的角度差异.

主要成果:

  • 该LTMI算法有效地减少了相邻部分之间的翻译错位.
  • 翻译错位的系统趋势显著减少.
  • 在区分连贯和不连贯的双边界之间提高了准确性.

结论:

  • 与现有的3D-EBSD数据方法相比,提议的LTMI对齐程序提供了更好的错位校正.
  • 该方法提高了3D微结构重建的可靠性.
  • 准确识别双边界类型对于材料表征至关重要.