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相关概念视频

Two-Dimensional Force System01:20

Two-Dimensional Force System

876
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:
876
Non-conservative Forces01:17

Non-conservative Forces

7.6K
Non-conservative forces are dissipative forces such as friction or air resistance. These forces take energy away from a system as it progresses. Unlike conservative forces, non-conservative forces do not have potential energy associated with them. This is because the energy is lost to the system and cannot be turned into useful work later.
Also unlike their conservative counterparts, they are path-dependent; where the object starts and stops does matter. For example, a grinding wheel applies a...
7.6K
Two-Dimensional Force System: Problem Solving01:29

Two-Dimensional Force System: Problem Solving

543
Solving problems related to two-dimensional force systems is an essential aspect of mechanics and engineering. By applying the principles of vector analysis and force equilibrium, one can determine the effect of multiple forces acting on an object in a two-dimensional space.
The first step to solving a two-dimensional force system problem is to draw a free-body diagram of the object under consideration. This diagram helps identify all the external forces acting on the object, including their...
543
Three-Dimensional Force System01:30

Three-Dimensional Force System

2.0K
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...
2.0K
Three-Dimensional Force System:Problem Solving01:30

Three-Dimensional Force System:Problem Solving

635
A three-dimensional force system refers to a scenario in which three forces act simultaneously in three different directions. This type of problem is commonly encountered in physics and engineering, where it is necessary to calculate the resultant force on the system, which can then be used to predict or analyze the behavior of the object or structure under consideration.
To solve a three-dimensional force system, first resolve each force into its respective scalar components. Do this using...
635
The Equilibrium Binding Constant and Binding Strength02:18

The Equilibrium Binding Constant and Binding Strength

12.8K
The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
12.8K

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Covalent Immobilization of Proteins for the Single Molecule Force Spectroscopy
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一个正式准确的理论来构建非反应性力场,使用线性回归来优化绑定参数.

Thomas A Manz1

  • 1Chemical & Materials Engineering, New Mexico State University Las Cruces NM 88001 USA tmanz@nmsu.edu.

RSC advances
|October 23, 2024
PubMed
概括

本研究介绍了力场功能理论 (FFFT),以形式精确性和高效参数化增强非反应性力场. 新的潜能提高了分子动力学模拟的精度.

科学领域:

  • 计算化学计算化学
  • 理论化学 理论化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 开发精确高效的非反应性力场对于分子模拟至关重要.
  • 现有的力场经常面临形式精确性,参数优化和分子动态的准确表示方面的挑战.

研究的目的:

  • 建立力场功能理论 (FFFT) 的理论基础.
  • 引入新的角度曲和键拉伸潜力,以提高精度和可区分性.
  • 为了证明有效的参数化和特征选择方法的力场.

主要方法:

  • 对FFFT的理论框架的推导.
  • 开发连续可微分的角度曲和第一原则衍生债券拉伸潜力.
  • 应用线性回归来优化参数,通过新的替代方法.
  • 实现嵌入式功能选择以提高计算效率.

主要成果:

  • 新的角度曲潜力与各种分子的CCSD计算有很好的一致性.
  • 新的键拉伸潜力准确地复制了H2和O2的振动能量水平.
  • 新的替代器显著降低了对非绑定参数的灵敏度,在强力恒定优化中.
  • 优化的灵活性模型产生振动频率在实验值的几百分之内.

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结论:

  • FFFT为开发先进的非反应性力场提供了一个强大的理论框架.
  • 新的潜力和参数化方法提高了分子模拟的准确性,效率和适用性.
  • 这种方法为计算化学和材料科学应用提供了显著的优势.