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相关概念视频

Metallic Solids02:37

Metallic Solids

18.8K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.8K
Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

218
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
218
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

1.4K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
1.4K
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

519
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
519
Unsymmetric Loading of Thin-Walled Members: Problem Solving01:07

Unsymmetric Loading of Thin-Walled Members: Problem Solving

172
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...
172

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相关实验视频

Updated: Sep 16, 2025

Indirect Fabrication of Lattice Metals with Thin Sections Using Centrifugal Casting
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在SEM中数据效率高的4D-STEM:超越2D材料到金属材料.

Ujjval Bansal1, Amit Sharma2, Barbara Putz3

  • 1Institute for Applied Materials, Karlsruhe Institute of Technology, Karlsruhe 76131, Germany.

Ultramicroscopy
|July 10, 2025
PubMed
概括

在SEM中的四维扫描传输电子显微镜 (4D-STEM) 现在提供了更快的采集和更高的角度分辨率. 这一进步使得像铜薄膜和FIB制备的铜等材料的详细成像成为可能.

关键词:
4D-STEM是一个4D-STEM.衍射的差异化方式事件驱动模式是事件驱动模式.像素化的探测器检测器这就是SEM SEM.

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相关实验视频

Last Updated: Sep 16, 2025

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科学领域:

  • 材料科学与工程 材料科学与工程
  • 电子显微镜电子显微镜
  • 纳米技术纳米技术

背景情况:

  • 四维扫描传输电子显微镜 (4D-STEM) 集成了空间和衍射数据,通过直接电子探测器技术进行增强.
  • 目前的4D-STEM应用主要在传输电子显微镜 (TEM) 和扫描电子显微镜 (SEM) 中,正在努力将其适应于SEM.

研究的目的:

  • 在扫描电子显微镜 (SEM) 中推进4D-STEM能力.
  • 为了提高获取速度,数据大小,角分辨率和4D-STEM在SEM中的材料适用性.

主要方法:

  • 在事件驱动模式中使用MiniPIX Timepix3探测器,以更快地获取和减少数据大小.
  • 实现了一种新的阶段探测器几何,以实现160毫米的摄像头长度,提高角度分辨率.
  • 应用4D-STEM对纳米结构铜薄膜进行成像,并在FIB制备的铜中识别火双胞胎.

主要成果:

  • 使用事件驱动模式实现了收购率的显著提高,使得SEM现场测试成为可能.
  • 增强的角分辨率允许先进的应用,如磁场或电场成像.
  • 成功成像了具有纳米尺度特征 (16纳米粒径) 的材料,并确定了微观结构特征,如化双胞胎.

结论:

  • 在SEM中展示了4D-STEM在SEM中的潜力,以在各种材料中实现更快,更高分辨率的成像.
  • 强调了4D-STEM与先进材料分析现场实验的协同作用.
  • 扩大了4D-STEM在SEM中的应用范围,用于各种材料科学研究.