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関連する概念動画

Vibrating Concrete01:19

Vibrating Concrete

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Mechanical vibrators are instrumental in compacting newly poured concrete within formwork and around reinforcements. This process is essential to eliminate trapped air pockets and establish a dense concrete mass. One widely used method is vibrating by internal vibrators, often referred to as a poker vibrator or immersion vibrator. It is rapidly inserted through the full depth of the freshly laid concrete and slightly extends into the layer below it (which remains in a plastic state). Consistent...
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Virtual Work for a System of Connected Rigid Bodies01:06

Virtual Work for a System of Connected Rigid Bodies

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Virtual work is a powerful method used to solve problems involving several connected rigid bodies. When the system is in equilibrium, virtual work is zero. This allows the calculation of the resulting forces when a system undergoes a virtual displacement. When attempting to analyze such a system, first, use a free-body diagram, where an independent coordinate represents the configuration of the links, and mark its deflected position resulting from the positive virtual displacement.
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Virtual Work01:20

Virtual Work

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The principle of virtual work states that if a body is in static and dynamic equilibrium, then the sum of all the virtual work done by all external forces and couple moments for any given virtual displacement must be zero.
In static equilibrium, a body can experience an imaginary or virtual movement, such as displacement or rotation. The virtual work done by a force is equal to the dot product of force and virtual displacement in the direction of the force. When it comes to virtually rotating a...
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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Relative Motion Analysis - Acceleration01:10

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A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
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A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
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仮想地震を用いた強い地運動の予測.

M A Denolle1, E M Dunham, G A Prieto

  • 1Department of Geophysics, Stanford University, 397 Panama Mall, Stanford, CA 94305, USA.

Science (New York, N.Y.)
|January 25, 2014
PubMed
まとめ
この要約は機械生成です。

堆積層の盆地における地震波の増幅を予測するための新しい仮想地震方法を紹介します. このアプローチは,地震シミュレーションを検証し,将来の地震の予測を改善します.

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科学分野:

  • 地震地震学 地震学
  • 地質物理学 地質物理学とは地質物理学です.
  • 計算による地震学.

背景:

  • 堆積層は地震波を増幅し,地震による被害を増加させます.
  • 現在の地震シミュレーションは,将来の出来事に対する検証が欠けている.

研究 の 目的:

  • 周囲の地震場を用いた地上運動の予測のための新しい方法を導入する.
  • 地震シミュレーションを新しいアプローチと比較して検証する.

主な方法:

  • 周囲の地震場を利用して地上の動きを予測する.
  • 南部サンアンドレアス断層のマグニチュード7のシナリオ地震に仮想地震アプローチを適用する.
  • 予測を伝統的な地震波伝播シミュレーションと比較する.

主要な成果:

  • 2つの方法とも,地震波の有意な増幅と源構造の結合を明らかにしています.
  • ロサンゼルス盆地全体で予測された揺れパターンの実質的な違いが観察されました.
  • 仮想地震アプローチは,長期にわたる強い地面運動を予測する新しい方法を提供します.

結論:

  • 仮想地震アプローチは,地震シミュレーションを検証するための実行可能な方法を提供します.
  • この新しいテクニックは,地面運動の予測,特に長期波の予測を向上させます.
  • 盆地効果を理解することは,正確な地震リスク評価に不可欠です.