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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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Stability of Equilibrium Configuration01:23

Stability of Equilibrium Configuration

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Understanding the stability of equilibrium configurations is a fundamental part of mechanical engineering. In any system, there are three distinct types of equilibrium: stable, neutral, and unstable.
A stable equilibrium occurs when a system tends to return to its original position when given a small displacement, and the potential energy is at its minimum. An example of a stable equilibrium is when a cantilever beam is fixed at one end and a weight is attached to the other end. If the weight...
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Equations of Equilibrium in Three Dimensions01:30

Equations of Equilibrium in Three Dimensions

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When analyzing structures or systems at rest, it is necessary to ensure they are in equilibrium. This is where the vector and scalar equations of equilibrium come into play. These equations are crucial in ensuring a structure is stable and will not collapse or fall apart. The vector and scalar equations of equilibrium provide a framework for analyzing the forces acting on a body.
According to the vector equations of equilibrium, the vector sum of all the external forces acting on a body must...
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Rigid Body Equilibrium Problems - II01:21

Rigid Body Equilibrium Problems - II

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A rigid body is in static equilibrium when the net force and the net torque acting on the system are equal to zero.
Consider two children sitting on a seesaw, which has negligible mass. The first child has a mass (m1) of 26 kg and sits at point A, which is 1.6 meters (r1) from the pivot point B; the second child has a mass (m2) of 32 kg and sits at point C. How far from the pivot point B should the second child sit (r2) to balance the seesaw?
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Rigid Body Equilibrium Problems - I00:49

Rigid Body Equilibrium Problems - I

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A rigid body is said to be in static equilibrium when the net force and the net torque acting on the system is equal to zero. To solve for rigid body equilibrium problems, do the following steps.
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Dynamic Equilibrium02:20

Dynamic Equilibrium

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A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
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相关实验视频

Updated: Jul 4, 2025

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
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在分子动力学模拟中的融合和平衡.

Franco Ormeño1, Ignacio J General2

  • 1Instituto de Investigaciones Biotecnológicas, Universidad Nacional de San Martín, San Martín, Buenos Aires, Argentina.

Communications chemistry
|February 7, 2024
PubMed
概括

分子动力学模拟需要长轨迹来确保热力学平衡和属性趋同. 虽然生物相关性质在多微秒模拟中经常稳定,但其他特征可能需要更长的分析时间.

科学领域:

  • 计算生物学 计算生物学
  • 生物物理学的生物物理.
  • 生物化学 生物化学

背景情况:

  • 分子动力学 (MD) 模拟对于研究生物分子运动和补充实验数据至关重要.
  • 医学医学的一个关键假设是,模拟轨迹足够长以达到热力学平衡,这往往被忽视.
  • 如果无法达到平衡,可能会使MD结果无效,特别是在预测平衡性质时.

研究的目的:

  • 在MD模拟中严格评估结构性,动态性和累积性质的融合.
  • 调查轨迹长度对基于MD的财产预测可靠性的影响.
  • 在生物分子模拟中澄清热力学平衡的物理和生物意义.

主要方法:

  • 分子动力学轨迹的分析长度高达100微秒.
  • 检查不同尺寸的多个系统,以确保广泛的适用性.
  • 探测各种结构,动态和累积性质的融合.

主要成果:

  • 生物相关性质通常在多微秒模拟时间尺度内趋同.
  • 某些属性,如过渡率到低概率的形状,可能需要更长的模拟时间来实现融合.
  • 这项研究提供了关于轨迹长度足够达到平衡的经验证据.

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结论:

  • 多微秒的MD轨迹通常足以可靠地预测关键的生物特性.
  • 研究人员必须在确定必要的模拟长度时仔细考虑正在研究的属性的性质.
  • 这些发现强调了在MD模拟中验证平衡假设的重要性,以获得准确的生物分子洞察力.