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相关概念视频

Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
Ampere-Maxwell's Law: Problem-Solving01:17

Ampere-Maxwell's Law: Problem-Solving

A parallel-plate capacitor with capacitance C, whose plates have area A and separation distance d, is connected to a resistor R and a battery of voltage V. The current starts to flow at t = 0. What is the displacement current between the capacitor plates at time t? From the properties of the capacitor, what is the corresponding real current?
To solve the problem, we can use the equations from the analysis of an RC circuit and Maxwell's version of Ampère's law.
For the first part of the problem,...
Network Function of a Circuit01:25

Network Function of a Circuit

Frequency response analysis in electrical circuits provides vital insights into a circuit's behavior as the frequency of the input signal changes. The transfer function, a mathematical tool, is instrumental in understanding this behavior. It defines the relationship between phasor output and input and comes in four types: voltage gain, current gain, transfer impedance, and transfer admittance. The critical components of the transfer function are the poles and zeros.
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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 semiconductor's...
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.

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相关实验视频

Updated: Jun 27, 2026

Generation of Scalable, Metallic High-Aspect Ratio Nanocomposites in a Biological Liquid Medium
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Generation of Scalable, Metallic High-Aspect Ratio Nanocomposites in a Biological Liquid Medium

Published on: July 8, 2015

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模拟复杂的多晶合金使用生成对抗网络启用计算平台.

Brayan Murgas1, Joshua Stickel1, Luke Brewer2

  • 1Department of Civil & Systems Engineering, Johns Hopkins University, Baltimore, MD, USA.

Nature communications
|November 2, 2024
PubMed
概括
此摘要是机器生成的。

本研究介绍了一种使用生成对抗网络 (GAN) 和DREAM.3D创建复杂合金的统计学等价虚拟微结构 (SEVM) 的新方法. 这使得先进的微机械建模能够改善材料属性预测.

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Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory
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相关实验视频

Last Updated: Jun 27, 2026

Generation of Scalable, Metallic High-Aspect Ratio Nanocomposites in a Biological Liquid Medium
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Generation of Scalable, Metallic High-Aspect Ratio Nanocomposites in a Biological Liquid Medium

Published on: July 8, 2015

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科学领域:

  • 材料科学 材料科学 材料科学
  • 计算材料科学科学 计算材料科学
  • 机械工程 机械工程

背景情况:

  • 对于复杂的多晶材料来说,生成统计学上相当的虚拟微结构 (SEVM) 是一个挑战.
  • 现有的方法在形态学和晶体学中与多模式分布作斗争.

研究的目的:

  • 开发一种综合方法,用于生成冷喷塑 (CSF) AA7050和增材制造 (AM) Ti64合金中复杂微结构的SEVM.
  • 为了实现可靠的多尺度微机械建模,用于预测材料性能.

主要方法:

  • 基于电子反射衍射 (EBSD) 统计数据的多模式微结构的生成对抗网络 (GAN) 与谷物包装的DREAM.3D的集成.
  • 开发一个多尺度模型,将粗粒的晶体可塑性有限元素模型 (CPFEM) 与超细粒的升级构成模型 (UFGs) 结合起来.
  • 模拟使用子体积元素和平均总体应力应变反应.

主要成果:

  • 成功为具有复杂微观结构特征的CSF AA7050和AM Ti64合金生成SEVM.
  • 一个强大的多尺度模型的演示,用于准确预测材料的行为.
  • 基于图像的微机械建模方法的验证.

结论:

  • 开发的方法有效地为具有挑战性的合金微结构生成SEVM.
  • 多尺度建模方法可以准确预测应力应变反应.
  • 这项工作对于在材料科学中推进微观结构与性质关系研究至关重要.