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相关概念视频

Indeterminate Structure01:18

Indeterminate Structure

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Indeterminate structures refer to structures where internal forces and reactions cannot be determined using only the equations of static equilibrium.  Indeterminate structures have more unknown forces and reaction forces than equations of static equilibrium that can be used to determine them. Indeterminate structures are often used in engineering to create complex, efficient, and aesthetically pleasing structures. There are various types of indeterminate structures used in engineering and...
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Shear and Bending Moment Diagram: Problem Solving01:24

Shear and Bending Moment Diagram: Problem Solving

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When analyzing a beam supporting concentrated loads and a distributed load, drawing the shear and bending moment diagrams is essential. These diagrams help understand the internal forces and moments acting on the beam, which is crucial for designing safe and efficient structures. Follow these steps to create the shear and bending moment diagrams:
Draw a Free-Body Diagram: Start by drawing a free-body diagram of the entire beam, including the concentrated loads, distributed load, and reaction...
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Constraints and Statical Determinacy01:26

Constraints and Statical Determinacy

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In structural engineering, the equilibrium of a system is not only determined by its equations of equilibrium but also with the help of constraints. Constraints refer to restrictions on the motion of a system. The proper combinations of constraints can minimize the total number of constraints needed to maintain a system in mechanical equilibrium. When this happens, the system is said to be statically determinate. For such systems, the unknown reaction supports can be estimated using equilibrium...
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Shear Diagram01:27

Shear Diagram

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In the study of beam mechanics, shear diagrams play a crucial role in understanding the distribution of shear forces along the length of a beam. Consider a beam AB that is supported at both ends and subjected to perpendicular loads.
First, a free-body diagram of the beam is drawn, representing all the external forces and internal reactions acting on the beam. One can calculate the reaction forces at each support by employing the equilibrium equations of force and moment. The vertical component...
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Introduction to Structures01:30

Introduction to Structures

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A structure is defined as a system of interconnected members designed to support or transfer forces and successfully withstand the loads acting on them. The internal forces of a structure can be determined by decomposing the structure and analyzing the free-body diagrams of the individual members or of a combination of members. This helps in understanding the structural elements' behavior and ensuring that the structure is stable and can withstand the subjected loads.
There are three main...
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Frames01:30

Frames

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Frames are essential components of various mechanical and structural systems used daily. These structures are known for their stability and ability to bear heavy loads. A frame is constructed using two-force and multi-force members, interconnected using pin joints. In contrast, trusses are made entirely of two-force members.
Frames are versatile and widely used in various applications such as structural supports for beams and columns, automobile chassis construction, and in the construction...
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剑桥结构数据库和结构动力学

Hans-Beat Bürgi1

  • 1Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Berne, Freiestr. 3, CH-3012 Bern, Switzerland.

Structural dynamics (Melville, N.Y.)
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PubMed
概括
此摘要是机器生成的。

结构数据库分析揭示了分子性质和结构参数之间的强烈相关性. 这些发现表明化学相互作用的统一观点,并使用机器学习实现未来结构预测.

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科学领域:

  • 化学晶体学 化学晶体学
  • 计算化学计算化学
  • 结构生物信息学 结构生物信息学

背景情况:

  • 剑桥结构数据库 (CSD) 提供了广泛的计算机可读的结晶学数据.
  • 结构数据的自动分析使得分子碎片和晶体结构的大规模比较成为可能.

研究的目的:

  • 调查结构参数 (距离,角度) 与其他分子可观测物之间的相关性.
  • 探索这些相关性如何为我们了解化学键和分子动力学提供信息.
  • 评估机器学习在预测结构和属性的潜力.

主要方法:

  • 从CSD中分析原子间距离,角度和扭转角度.
  • 与光谱信号,反应能量和激活能量进行相关性分析.
  • 结构参数空间的定性映射.

主要成果:

  • 断片的结构参数在各种环境中的高度相关的分布.
  • 连续的相关性延伸到很大的参数范围,反映化学过程.
  • 在 (自由) 能量表面中识别与分子动态相对应的低能量区域.

结论:

  • 相对关系为结构数据提供了一个组织原则,挑战了传统的交互定义.
  • 建议在易斯酸相互作用方面重新考虑键和非共价相互作用.
  • 未来的机器学习应用程序对可靠的结构和属性预测具有前景.