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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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Dynamic Modulus of Elasticity of Concrete01:16

Dynamic Modulus of Elasticity of Concrete

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The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
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Internal Loadings in Structural Members: Problem Solving01:28

Internal Loadings in Structural Members: Problem Solving

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When designing or analyzing a structural member, it is important to consider the internal loadings developed within the member. These internal loadings include normal force, shear force, and bending moment. Engineers can ensure that the structural member can support the applied external forces by calculating these internal loadings.
To illustrate this, let's consider a beam OC of 5 kN, inclined at an angle of 53.13° with the horizontal and supported at both ends. Determine the internal...
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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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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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Kinematic Equations: Problem Solving01:15

Kinematic Equations: Problem Solving

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When analyzing one-dimensional motion with constant acceleration, the problem-solving strategy involves identifying the known quantities and choosing the appropriate kinematic equations to solve for the unknowns. Either one or two kinematic equations are needed to solve for the unknowns, depending on the known and unknown quantities. Generally, the number of equations required is the same as the number of unknown quantities in the given example. Two-body pursuit problems always require two...
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相关实验视频

Updated: Jun 3, 2025

Simulation of Human-induced Vibrations Based on the Characterized In-field Pedestrian Behavior
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动态结构方程建模与地板效应.

Bengt Muthén1, Tihomir Asparouhov1, Saul Shiffman2

  • 1Mplus.

Psychological methods
|January 6, 2025
PubMed
概括
此摘要是机器生成的。

本研究涉及心理数据分析中的底层效应. 两部分建模提供了一个解决方案,以避免误导标准方法的结果,提供一个更准确的分析结果与许多最低值.

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相关实验视频

Last Updated: Jun 3, 2025

Simulation of Human-induced Vibrations Based on the Characterized In-field Pedestrian Behavior
10:52

Simulation of Human-induced Vibrations Based on the Characterized In-field Pedestrian Behavior

Published on: April 13, 2016

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Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
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科学领域:

  • 心理学 心理学 心理学
  • 统计 统计 统计 统计
  • 健康科学 卫生科学 卫生科学

背景情况:

  • 在心理学中,密集的纵向数据分析经常会遇到具有强烈地板效应的结果.
  • 在标准分析中忽视地板效应可能会导致误导性结果,因为违反了建模假设.

研究的目的:

  • 引入两部分建模作为一种方法,以解决密集的纵向数据中的地板效应.
  • 为了证明两部分建模如何与传统方法相比可以提供更准确和更详细的见解.

主要方法:

  • 该研究提出并说明了两部分建模,用于处理具有显著地板效应的结果.
  • 用一个戒烟的例子来演示分析技术.

主要成果:

  • 两部分建模可以绕过忽视地板效应所造成的偏差效应.
  • 这种方法允许对在地板上或在地板上方的共同变量效应进行差异化检查.

结论:

  • 两部分建模是一种有价值的技术,用于分析密集的纵向数据与地板效应.
  • 它提高了统计推断的精度和这些数据中的共变量关系的可解释性.