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Spherical and Cylindrical Capacitor01:26

Spherical and Cylindrical Capacitor

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A spherical capacitor consists of two concentric conducting spherical shells of radii R1 (inner shell) and R2 (outer shell). The shells have  equal and opposite charges of +Q and −Q, respectively. For an isolated conducting spherical capacitor, the radius of the outer shell can be considered to be infinite.
Conventionally, considering the  symmetry, the electric field between the concentric shells of a spherical capacitor is directed radially outward. The magnitude of the field,...
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Updated: Jul 12, 2025

Human Brown Adipose Tissue Depots Automatically Segmented by Positron Emission Tomography/Computed Tomography and Registered Magnetic Resonance Images
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卷轴型电池以伪圆柱形坐标进行断层细分的方法

Dominick P Guida1, Alyssa M Stavola1, Andrew Chihpin Chuang2

  • 1Department of Chemical Engineering, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 02115, United States of America.

ACS measurement science au
|October 25, 2023
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概括

这项研究引入了一种使用X射线计算机断层扫描 (CT) 数据分析电池结构的新方法. 它将笛卡尔坐标转换为伪圆柱形坐标,改善了对性Zn-MnO2等电池的辐射依赖性的理解.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 影像科学 影像科学

背景情况:

  • 高分辨率的X射线计算机断层扫描 (CT) 对于分析密封电池样本至关重要.
  • 在CT数据中的笛卡尔坐标不适合研究波型电池的辐射依赖.
  • 酸二氧化 (Zn-MnO2) 电池在初级电池市场上普遍存在.

研究的目的:

  • 开发一种方法,将卡特西安CT数据近似化为伪圆柱形坐标.
  • 通过对齐辐射体积分数,使计算电池模型和CT数据之间的相关性成为可能.
  • 改进波型电池中辐射材料依赖性的分析.

主要方法:

  • 对来自Zn-MnO2 AA电池阳极的CT数据应用了一种新的伪圆柱形坐标转换.
  • 伪半径被定义为从中央电流引脚到阳极内的分离器之间的相对距离.
  • 该方法通过使用10个AA电池阳极来证明和验证.

主要成果:

  • 伪圆柱式方法产生了平均的一维材料配置文件.
  • 这些配置文件显示,与其他平均化方法相比,对单个阳极切片的定量匹配有所改善.
  • 该方法有效地纠正了式电池组件中的不对称性.

结论:

  • 开发的伪圆柱形坐标方法增强了对式电池的CT数据的分析.
  • 这种方法可以更好地比较实验CT数据和计算电池模型.
  • 精确的辐射分析对于优化电池性能和设计至关重要.