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関連する概念動画

Mechanical Systems01:22

Mechanical Systems

247
Mechanical systems are analogous to to electrical networks where springs and masses play similar roles to inductors and capacitors, respectively. A viscous damper in mechanical systems functions similarly to a resistor in electrical networks, dissipating energy. The forces acting on a mass in such systems include an applied force in the direction of motion, counteracted by forces from the spring, a viscous damper, and the mass's acceleration. This interplay of forces is mathematically...
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Mechanism of Ciliary Motion01:05

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The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
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Mechanical Efficiency of Real Machines01:14

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The mechanical efficiency of a machine is a fundamental concept that describes how effectively a machine can convert input work into output work. According to this concept, the efficiency of a machine is equal to the ratio of the output work to the input work. An ideal machine, meaning a machine that has no energy losses, has an efficiency of one. This implies that the input work and the output work are equal.
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There are many devices and situations in which fluid flows at a constant height and so can be analyzed using Bernoulli's principle. These devices include, but are not limited to, entrainment devices and fluid flow measuring devices.
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Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
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Rapid Fabrication of Custom Microfluidic Devices for Research and Educational Applications
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機械的に片道材料

Bohan Sun1,2, Sung Hoon Kang1,2

  • 1Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, USA.

Science (New York, N.Y.)
|April 13, 2023
PubMed
まとめ
この要約は機械生成です。

不対称な機械反応を示す材料は,様々な用途のために開発されています. この研究は,高度な技術的な用途のためのユニークな変形行動を持つ新しい材料を調査しています.

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科学分野:

  • 材料科学
  • 機械工学
  • 固体力学

背景:

  • 材料における非対称な機械的反応は,高度な応用において極めて重要です.
  • アニゾトロプ的変形の根本的なメカニズムを理解することは不可欠です.
  • 現在の材料はしばしば望ましいレベルの 機械的非対称性を欠いている.

研究 の 目的:

  • 牽引と圧縮の負荷下で異なる反応を示す新しい材料を調査する.
  • この非対称な材料の機械的振る舞いを特徴づけ,潜在的な応用を探求する.
  • 機械的な性質を合わせた材料を設計するための基礎を提供すること.

主な方法:

  • 牽引と圧縮試験を用いた実験的特徴付け
  • 構造と機械の反応を 関連付けるための微細構造分析
  • 非対称な変形をシミュレートするために,有限要素モデリング.

主要な成果:

  • 材料は,緊張と圧縮下で有意に異なる強度と硬さを示した.
  • 微細構造の観測により,観察された機械的非対称性に寄与するアニソトロピックな特徴が明らかになった.
  • シミュレーションにより 材料の非対称性を 正確に予測しました

結論:

  • 開発された材料は,有意な非対称な機械的反応を示しています.
  • この非対称性は,異なるロード動作を必要とする領域での革新的なアプリケーションの道を開きます.
  • 特定の非対称性性能要求のために,さらなる研究により,材料設計を最適化することができます.