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Typical Model Studies01:30

Typical Model Studies

619
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
619
Entropy and Solvation02:05

Entropy and Solvation

8.2K
The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
8.2K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.6K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
2.6K
Molecular Orbital Theory II03:51

Molecular Orbital Theory II

26.9K
Molecular Orbital Energy Diagrams
26.9K
Dimensionless Groups in Fluid Mechanics01:15

Dimensionless Groups in Fluid Mechanics

760
Dimensionless groups in fluid mechanics provide simplified ratios that help analyze fluid behavior without relying on specific units. The Reynolds number (Re), which represents the ratio of inertial to viscous forces, distinguishes between laminar and turbulent flows, making it essential in the design of pipelines and aerodynamic surfaces. The Froude number (Fr), the ratio of inertial to gravitational forces, is particularly useful in predicting wave formation and hydraulic jumps in...
760
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.6K
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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相关实验视频

Updated: Jan 15, 2026

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

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随机组织的关键性与远程水力动力学相互作用.

Tristan Jocteur1, Cesare Nardini2, Eric Bertin1

  • 1Univ. Grenoble-Alpes, CNRS, LIPhy, 38000, Grenoble, France.

The European physical journal. E, Soft matter
|October 6, 2025
PubMed
概括

驱动软体体温系统表现出可逆-不可逆转的转变. 包括远程相互作用改变了关键性质,导致凸过渡和消失波动,与最小模型不同.

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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Last Updated: Jan 15, 2026

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科学领域:

  • 软物质物理学 软物质物理学
  • 统计力学 统计力学
  • 复杂的系统复杂的系统.

背景情况:

  • 驱动软性热脉系统可以在停止和活跃状态之间进行过渡.
  • 循环剪切的悬架为研究这些过渡提供了一个模型系统.
  • 现有的模型,如随机组织模型 (ROM),简化了粒子相互作用.

研究的目的:

  • 为了研究远程水力动力相互作用对驱动软体体温系统中可逆-不可逆转转变的影响.
  • 通过结合这些相互作用来概括随机组织模型 (ROM).
  • 了解关键性质如何随相互作用范围而变化.

主要方法:

  • 将随机组织模型 (ROM) 泛化,包括与权力法衰变的远程相互作用.
  • 分析关键性质作为相互作用衰变指数的函数.
  • 采用局部平均场模型来合理化观察到的关键行为.

主要成果:

  • 关键性质持续依赖于比空间维度小的指数的衰减指数.
  • 相互作用范围的增加导致凸过渡 (变),消失的波动,以及超均性的丧失.
  • 长距离相互作用引起的扩散运动在缓慢衰变的相互作用中占主导地位.

结论:

  • 长距离的相互作用显著改变了驱动软体体温系统的关键行为.
  • 一般化的ROM通过包括水力动力学效应提供了更现实的描述.
  • 过渡的性质是敏感的范围和性质的粒子之间的力量.