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相关概念视频

Equilibrium Conditions for a Particle01:23

Equilibrium Conditions for a Particle

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When an object is in equilibrium, it is either at rest or moving with a constant velocity. There are two types of equilibrium: static and dynamic. Static equilibrium occurs when an object is at rest, while dynamic equilibrium occurs when an object is moving with a constant velocity. In both cases, there must be a balance of forces acting on the object.
To understand the concept of equilibrium, let us first consider the forces acting on an object. When different forces act on an object, they can...
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Force and Potential Energy in One Dimension01:13

Force and Potential Energy in One Dimension

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Force can be calculated from the expression for potential energy, which is a function of position. The component of a conservative force, in a particular direction, equals the negative of the derivative of the corresponding potential energy with respect to the displacement in that direction. For regions where potential energy changes rapidly with displacement, the work done and force is maximum. Also, when force is applied along the positive coordinate axis, the potential energy decreases with...
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Two-Dimensional Force System01:20

Two-Dimensional Force System

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A two-dimensional system in mechanical engineering involves the analysis of motion and forces in a plane. A two-dimensional force vector can be resolved into its components as:
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Principle of Linear Impulse and Momentum for a Single Particle: Problem Solving01:23

Principle of Linear Impulse and Momentum for a Single Particle: Problem Solving

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Consider a wooden box and a cylinder of known masses m1 and m2, respectively,  hanging from a ceiling with the help of a massless pulley system.
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Three-Dimensional Force System01:30

Three-Dimensional Force System

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In mechanical engineering, a three-dimensional force system is a system of forces acting in three dimensions, with forces applied along the x, y, and z coordinate axes. The three-dimensional force system is an important concept in mechanical engineering, as it allows engineers to understand and analyze the behavior of objects and structures in three dimensions. By understanding the forces acting on a system, engineers can design more efficient and effective mechanical systems that can withstand...
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Basic Equation for Pressure Field01:13

Basic Equation for Pressure Field

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The basic equation for a pressure field in fluid mechanics captures the balance of forces within any segment of fluid, providing a foundational understanding of how pressure changes within fluids under various forces. Generally, two main types of forces act on any part of a fluid: surface forces and body forces. Surface forces arise from pressure differences across points within the fluid, which result in net forces that can vary depending on the local pressure gradient. Body forces, on the...
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相关实验视频

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Author Spotlight: Advancing Cell Membrane Biophysics - Exploring Interactions and Challenges Through Experimental and Computational Approaches
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从可微分粒子场分子动力学中学习力场参数.

Manuel Carrer1, Henrique Musseli Cezar1, Sigbjørn Løland Bore1

  • 1Hylleraas Centre for Quantum Molecular Sciences and Department of Chemistry, University of Oslo, PO Box 1033, Blindern, 0315 Oslo, Norway.

Journal of chemical information and modeling
|July 4, 2024
PubMed
概括

我们介绍了∂-HylleraasMD (∂-HyMD),用于自动化力场优化的微分分子动力学软件. 这种方法提高了脂质和甘油三模拟的准确性和参数可转移性.

科学领域:

  • 计算化学是一种计算化学.
  • 分子动力学分子动力学
  • 软件开发 软件开发

背景情况:

  • 精确的分子动力学模拟依赖于精确的力场参数.
  • 优化这些参数传统上涉及计算密集,经常手动的过程.
  • 现有的微分分子动力学方法面临着记忆和数值稳定的挑战.

研究的目的:

  • 为了开发一个完全端到端可微分的分子动力学软件, ∂-HylleraasMD (∂-HyMD).
  • 为优化分子力场参数建立一个自动化的协议.
  • 解决现有的微分分子动力学方法的局限性.

主要方法:

  • 使用JAX自动diff框架和哈密尔顿混合粒子场形式主义开发了∂-HylleraasMD (∂-HyMD).
  • 实现了一个令人尬的并行优化算法,用于同时模拟和梯度计算.
  • 利用反向模式自动差异化,用于代力场参数的优化.

主要成果:

  • 与无梯度方法相比,在力场参数最小化方面实现了更快的收.
  • 为脂物生成了一个力场库,其密度概况与全原子参考相比有所改善.
  • 准确预测未在学习集中的属性,如侧向压力概况.

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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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结论:

  • ∂-HyMD为自动化力场参数优化提供了一种高效和稳定的方法.
  • 开发的力场表现出更高的准确性和可转移到相关系统,如甘油三.
  • 这项工作推进了计算化学中可微分分子动力学的能力.