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相关概念视频

Mesh Analysis01:20

Mesh Analysis

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Mesh analysis is a valuable method for simplifying circuit analysis using mesh currents as key circuit variables. Unlike nodal analysis, which focuses on determining unknown voltages, mesh analysis applies Kirchhoff's voltage law (KVL) to find unknown currents within a circuit. This method is particularly convenient in reducing the number of simultaneous equations that need to be solved.
A fundamental concept in mesh analysis is the definition of meshes and mesh currents. A mesh is a closed...
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Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

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When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
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Plastic Deformations of Members with a Single Plane of Symmetry01:21

Plastic Deformations of Members with a Single Plane of Symmetry

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When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...
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Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
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MPPD:一个用户友好的姿势变形程序用于网状类型的计算幻象.

Haegin Han1, Jaehyo Kim2, Sungho Moon2

  • 1Division of Cancer Epidemiology & Genetics, National Cancer Institute, National Institute of Health, 9609, Medical Center Drive, Rockville, MD, 20850.

Health physics
|September 4, 2024
PubMed
概括
此摘要是机器生成的。

一个新的软件工具,MPPD,允许在成年网状类型参考计算幻象 (MRCP) 中同时调整身高和姿势. 这使得通过将两个因素考虑在一起,可以更准确地估计辐射剂量.

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科学领域:

  • 医学物理 医学物理
  • 辐射保护 辐射保护
  • 计算生物学 计算生物学

背景情况:

  • 国际辐射保护委员会 (ICRP) 推出了具有高可变性的成年网状型参考计算幻象 (MRCP).
  • 以前的研究探讨了不同身高和姿势的剂量计影响,但缺乏同时分析它们的能力.
  • 现有的研究受限于分析的姿势范围和无法结合身高和姿势变化.

研究的目的:

  • 开发一个用户友好的软件工具,MPPD (Mesh-type Phantom Posture Deformer),用于调整MRCP的姿势.
  • 调查MPPD程序的计算效率和RAM使用情况.
  • 评估使用MPPD变形幻象的剂量计算的准确性,并探索身高和姿势的联合剂量计影响.

主要方法:

  • 开发一个带有图形用户界面的MPPD程序,用于MRCP和图书馆幽灵的姿势调整.
  • 应用MPPD使五个不同身高的成年男性幽灵变形为坐姿和跪姿.
  • 计算MPPD变形幻象的损害权重剂量,以验证该计划的有效性.

主要成果:

  • MPPD程序展示了快速的计算速度和最小的RAM使用.
  • 使用MPPD变形幻体计算的剂量值与现有数据有很好的一致性.
  • 该研究首次通过同时考虑身高和姿势成功估计了辐射剂量.

结论:

  • MPPD程序是扭曲MRCP和计算辐射剂量的有效工具.
  • 同时考虑身高和姿势对于准确估计辐射剂量至关重要.
  • 身高和姿势对辐射剂量的影响因辐射源而异.