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相关概念视频

Fluid Pressure over Flat Plate of Variable Width01:02

Fluid Pressure over Flat Plate of Variable Width

1.8K
When a flat plate is submerged in a fluid, the fluid exerts pressure on the plate. This pressure can lead to many different phenomena, including drag and buoyancy. To understand the behavior of the fluid over a flat plate of variable width, it is essential to analyze the distribution of the pressure exerted.
The pressure distribution on the plate can be calculated by determining the force that acts on a differential area strip of the plate. Thus, the magnitude of the force is equal to the...
1.8K
Fluid Pressure over Curved Plate of Constant Width01:12

Fluid Pressure over Curved Plate of Constant Width

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When a curved plate of constant width is submerged in a liquid, the pressure acting normal to the plate varies continuously both in magnitude and direction. Calculating the magnitude and location of the resultant force at a point is often challenging for such cases. One of the methods to determine the resultant force and its location involves separately calculating the horizontal and vertical components of the resultant force. This complex calculation can be simplified by representing the...
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Typical Model Studies01:30

Typical Model Studies

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Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
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Fluid Pressure over Flat Plate of Constant Width01:05

Fluid Pressure over Flat Plate of Constant Width

2.1K
When a body is submerged in water, it experiences fluid pressure acting normal on its surface and distributed over its area. For better design structures, it is crucial to determine the magnitude and location of the resultant force acting on the surface. In the case of a rectangular plate of constant width submerged in water, the pressure increases with depth, resulting in a linearly varying trapezoidal pressure distribution from the upper to the lower edge of the plate.
The resultant force...
2.1K
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
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评估板块重建模型使用板块驱动力一致性测试.

Edward J Clennett1,2, Adam F Holt3, Michael G Tetley4

  • 1Institute for Geophysics, Jackson School of Geosciences, The University of Texas at Austin, Austin, USA. edward.clennett@utexas.edu.

Scientific reports
|June 23, 2023
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概括

本研究引入了一种新的算法,通过计算驱动力来评估板块重建模型中的地力学可信性. 它揭示了过去的重建中的显著残余扭矩,突出了模型改进的领域.

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科学领域:

  • 地质物理学 地质物理学
  • 板块构造学是一种板块构造学.
  • 地力学是什么?地力学是什么?

背景情况:

  • 板块重建模型通常使用地质和地物理数据,但往往忽视物理板块驱动力.
  • 这种遗漏可能导致地力学上不可思议的重建,对地球科学研究产生重大影响.

研究的目的:

  • 开发和介绍一种新的算法,用于计算时间依赖的板块驱动力 (板块拉动,脊推,地幔拖动).
  • 评估板块重建中的残余扭矩,并识别潜在的地力学不合理性或知识差距.

主要方法:

  • 该算法计算了时间依赖的板拉力,推力 (重力潜在能量力) 和地幔阻力.
  • 它评估了平衡板运动所需的剩余扭矩,基于拓上封闭的重建所假定的驱动力关系.

主要成果:

  • 对于今天的重建来说,残余扭矩是最小的,但在900万年前到5000万年前的模型中可能是相当大的 (与驱动扭矩相同的数量级).
  • 对太平洋板块的分析表明,该算法在确定时间段和具有高残余扭矩的区域方面具有实用性.

结论:

  • 该算法作为一个工具来评估和增强使用动态约束的板块重建模型.
  • 已识别的残余扭矩表明了潜在的地力学不合理性,或突出了在特定地质时间中像地幔流动这样未被建模的力量的重要性.