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相关概念视频

Irrotational Flow01:28

Irrotational Flow

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Irrotational flow is characterized by fluid motion where particles do not rotate around their axes, resulting in zero vorticity. For a flow to be irrotational, the curl of the velocity field must be zero. This imposes specific conditions on velocity gradients. For instance, to maintain zero rotation about the z-axis, the gradient condition:
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Control of Power Flow01:30

Control of Power Flow

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There are several methods to control power flow in power systems:
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General External Flow Characteristics01:26

General External Flow Characteristics

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The study of external flow is essential for creating structures and objects that interact efficiently and safely with moving fluids, such as air or water. When a body is immersed in a flowing fluid, it experiences two primary forces: drag, which opposes motion along the flow direction, and lift, which acts perpendicular to the flow. The shape, size, and orientation of the object influence these forces.Streamlined and Blunt Bodies in External FlowObjects in fluid flow are classified as...
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Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

199
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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Sequence Networks of Rotating Machines01:24

Sequence Networks of Rotating Machines

103
A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
Zero-sequence current induces a voltage drop across the generator's neutral impedance and other...
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Rolling Without Slipping01:09

Rolling Without Slipping

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People have observed the rolling motion without slipping ever since the invention of the wheel. For example, one can look at the interaction between a car's tires and the surface of the road. If the driver presses the accelerator to the floor so that the tires spin without the car moving forward, there must be kinetic friction between the wheels and the road's surface. If the driver slowly presses the accelerator, causing the car to move forward, the tires roll without slipping. It is...
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相关实验视频

Updated: Jul 6, 2025

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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断开连接的流程介导的谷物旋转.

Caihao Qiu1, Marco Salvalaglio2,3, David J Srolovitz4

  • 1Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong Special Administrative Region, China.

Proceedings of the National Academy of Sciences of the United States of America
|December 28, 2023
PubMed
概括
此摘要是机器生成的。

聚晶材料中的粒度旋转是由断路驱动的,这些断路是线路缺陷. 本研究引入了一个模型,展示了断电流如何影响谷物方向和接口演变.

关键词:
连续性的建模.谷物边界的谷物边界是什么谷物生长的增长 谷物生长的增长谷物旋转的谷物旋转.材料科学 材料科学 材料科学

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Culturing Lymphocytes in Simulated Microgravity Using a Rotary Cell Culture System

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相关实验视频

Last Updated: Jul 6, 2025

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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科学领域:

  • 材料科学 材料科学 材料科学
  • 晶体学 晶体学是指结晶学.
  • 连续力学 连续力学

背景情况:

  • 颗粒旋转是多晶材料 (如金属和陶) 中常见的现象.
  • 接口迁移被理解为由断开连接 (线路缺陷) 的移动驱动.

研究的目的:

  • 提出一个连续模型,尊重晶体学对粒边界和接口.
  • 调查谷物旋转和微观结构演变中断路的作用.

主要方法:

  • 为曲面接口开发一个结晶学尊重的连续模型.
  • 数字模拟分析断开流对粒度方向和接口形态学的影响.
  • 模型预测与分子动力学模拟的比较.

主要成果:

  • 断开连接的流动被证明改变了颗粒的方向和接口形态.
  • 发现内部应力场与断开连接的流动有关.
  • 模型预测与毛细管驱动的谷物边界演变的分子动力学结果保持一致.

结论:

  • 拟议的连续模型有效地捕捉了谷物旋转中断路的作用.
  • 该模型为理解由接口迁移驱动的微结构演变提供了一个框架.
  • 这项工作提供了对多晶材料行为的基本机制的见解.