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相关概念视频

Unsymmetric Loading of Thin-Walled Members01:23

Unsymmetric Loading of Thin-Walled Members

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Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
The concept of the shear center is crucial in countering the...
147
Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

660
Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
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X-ray Imaging01:24

X-ray Imaging

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German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
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Unsymmetric Loading of Thin-Walled Members: Problem Solving01:07

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167
The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
To compute the shear forces, find the shear flow at a specific distance from the endpoint using the vertical shear and the moment of inertia values. The total shear force on the flange is calculated by integrating the shear flow from one end of the flange to the other.
Next, calculate the moments of...
167

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医疗添加剂制造文件的轻量级编码

Xin Zhao1,2, Jinjie Huang3,4,5, Mingcong Xu1,6

  • 1School of Computer Science and Technology, Harbin University of Science and Technology, Harbin, China.

3D printing in medicine
|August 5, 2025
PubMed
概括

一个新的轻量级编码策略显著减少了超过80%的医疗3D模型文件大小,同时保持了准确性. 这种方法提高了增材制造的存储和传输效率,确保与标准格式的兼容性.

关键词:
3D几何模型 3D几何模型功能聚类是指特征聚类.轻量化编码 轻量化编码医疗添加剂制造 医疗添加剂制造形状因子算法 形状因子算法

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科学领域:

  • 医疗添加剂制造 医疗添加剂制造
  • 3D打印技术的使用
  • 计算几何学的计算几何学

背景情况:

  • 增材制造使复杂的,定制的医疗植入物成为可能,从而导致大3D模型文件大小.
  • 大文件大小在数据存储,传输和处理方面带来了挑战.
  • 现有的压缩方法在复杂的医学模型中难以保持准确性和兼容性.

研究的目的:

  • 为医疗增材制造中的3D几何文件开发一种轻量化编码策略.
  • 为了显著减少文件大小,同时保持数据准确性和兼容性.
  • 为应对医疗3D打印中大量数据所带来的挑战.

主要方法:

  • 一种基于几何关系的集群方法,用于网状模型的拓重建.
  • 不统一和多尺度的网格简化,以保留关键特征并减少数据冗余.
  • 实现对增材制造文件 (AMF) 和3D制造格式 (3MF) 的兼容编码方案,称为Lite AMF和Lite 3MF.

主要成果:

  • 与原始格式相比,Lite AMF的文件大小减少了81.99%,Lite 3MF的文件大小减少了91.34%.
  • 对几何特征的高保真性保存,Hausdorff距离低于0.001.
  • 准确性保持在医疗添加剂制造的可接受公差范围内.

结论:

  • 轻量化编码策略有效地将医疗3D模型文件大小减少了80%以上.
  • 数据的准确性和与现有的AMF和3MF格式的兼容性得到保留.
  • 实现了更高的存储和传输效率,支持医疗添加剂制造工作流.