Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Density00:56

Density

13.3K
Density is an important characteristic of substances, crucial in determining whether an object sinks or floats in a fluid. Its SI unit is kg/m3, and its cgs unit is g/cm3. The density of an object helps in identifying its composition, and also reveals information about the phase of the matter and its substructure. The densities of liquids and solids are roughly comparable, consistent with the fact that their atoms are in close contact. However, gases have much lower densities than liquids and...
13.3K
Density, Specific Weight, Specific Gravity and Compressibility of Fluid01:27

Density, Specific Weight, Specific Gravity and Compressibility of Fluid

155
Density, specific weight, specific gravity, and compressibility are fundamental properties of fluids. Density is the mass per unit volume, characterizing the mass of a fluid system. It influences buoyancy, pressure, flow dynamics, viscosity, thermal conductivity, and sound propagation. For instance, in pipeline design, accurate density measurements ensure that the pipeline can handle the fluid's mass.
Specific weight represents the weight per unit volume and is calculated by multiplying...
155
Density and Archimedes' Principle01:05

Density and Archimedes' Principle

6.4K
When a lump of clay is dropped into water, it sinks. But if the same lump of clay is molded into the shape of a boat, it starts to float. Because of its shape, the clay boat displaces more water than the lump and experiences a greater buoyant force, even though its mass is the same. The same holds true for steel ships. The average density of an object majorly determines if the object will float. If an object's average density is less than that of the surrounding fluid, it will float. The...
6.4K
Characteristics of Fluids01:20

Characteristics of Fluids

3.5K
When a force is applied parallel to the top surface of a solid, it resists the applied force due to the internal frictional forces between the layers of the solid known as shearing resistance. However, when the force is removed, the shearing forces restore the original shape of the solid. Other deformation forces also cause temporary changes in shape if the forces are not beyond a threshold magnitude. Solids tend to retain their shape, making the study of their rest and motion easier. Beyond...
3.5K
Newtonian Fluid: Problem Solving01:18

Newtonian Fluid: Problem Solving

135
Newtonian fluids exhibit a constant viscosity, meaning their shear stress and shear strain rate are directly proportional. This property ensures a predictable and stable response to applied forces, maintaining a linear relationship between force and flow. Examples include water, air, and light oils, consistently demonstrating this proportional behavior regardless of external conditions.
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
135
Viscosity of Fluid01:19

Viscosity of Fluid

195
Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.
195

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Nanoconfined superionic water is a molecular superionic.

Science advances·2026
Same author

Roles of Bulk and Surface Thermodynamics in the Selective Adsorption of a Confined Azeotropic Mixture.

The journal of physical chemistry. B·2026
Same author

Dielectrocapillarity for exquisite control of fluids.

Nature communications·2026
Same author

A first-principles approach to electromechanics in liquids.

Journal of physics. Condensed matter : an Institute of Physics journal·2025
Same author

Symmetry Breaking in the Superionic Phase of Silver Iodide.

Physical review letters·2025
Same author

Towards the automatic detection of activities of daily living using eye-movement and accelerometer data with neural networks.

Computers in biology and medicine·2025

相关实验视频

Updated: May 8, 2025

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
06:37

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package

Published on: September 17, 2021

4.4K

学习离子流体的经典密度函数.

Anna T Bui1, Stephen J Cox2

  • 1University of Cambridge, Yusuf Hamied Department of Chemistry, Lensfield Road, Cambridge, CB2 1EW, United Kingdom.

Physical review letters
|April 25, 2025
PubMed
概括
此摘要是机器生成的。

机器学习增强了对离子流体的经典密度函数理论 (cDFT). 这种新方法准确地模拟了电解质溶液和离子液体,改善了理论化学预测.

更多相关视频

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
11:03

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

Published on: December 4, 2017

8.4K
Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
10:52

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

12.7K

相关实验视频

Last Updated: May 8, 2025

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
06:37

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package

Published on: September 17, 2021

4.4K
An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
11:03

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

Published on: December 4, 2017

8.4K
Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
10:52

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

12.7K

科学领域:

  • 物理化学 物理化学
  • 计算材料科学科学 计算材料科学
  • 统计力学 统计力学

背景情况:

  • 经典密度函数理论 (cDFT) 是模拟流体的强大工具,但由于强大的库伦比力和硬质效应,它与离子系统作斗争.
  • 现有的cDFT近似方法在准确描述离子流体内的复杂相互作用方面有限,这阻碍了各种科学领域的应用.

研究的目的:

  • 扩展机器学习 (ML) 框架,最初用于短距离相互作用,以准确描述离子流体.
  • 开发一种更强大的理论方法,以了解电解质溶液和离子液体的行为.

主要方法:

  • 通过结合来自当地的分子场理论的概念来适应机器学习方法.
  • 利用神经网络来学习单体直接相关函数和密度配置文件之间的局部相关性,以实现简化系统.
  • 以受控的中场方式考虑了长距离的库伦比相互作用.

主要成果:

  • ML增强的cDFT框架准确地预测了各种离子流体模型的结构和热力学.
  • 成功描述了包括大小不对称和多价电解质和离子液体在内的系统.
  • 与从分子模拟中获得的结果表现出强烈一致.

结论:

  • 开发的ML方法为将cDFT应用于复杂的离子系统提供了重大进展.
  • 这项工作为将ML驱动的cDFT扩展到需要精确原子间电位的系统铺平了道路.
  • 该方法提供了一个计算效率高,准确的工具,用于在物理,生物和材料科学中研究离子流体.