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関連する概念動画

Path Between Thermodynamics States01:21

Path Between Thermodynamics States

Consider the two thermodynamic processes involving an ideal gas that are represented by paths AC and ABC in Figure 1:
Mechanical Efficiency of Real Machines01:14

Mechanical Efficiency of Real Machines

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.
However, in reality, no machine can be truly ideal, and all of them experience some...
Machines01:19

Machines

Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. One example of a machine is the cutting plier, which is used to cut wires by applying forces to its handles. When equal and opposite forces are exerted on the handles of the cutting plier, they cause the cutting edges to come together and apply equal and opposite reaction forces on the wire, which are greater than the applied forces.
A free-body diagram of the...
Indirect Motor Pathways01:22

Indirect Motor Pathways

The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
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Mechanical Systems01:22

Mechanical Systems

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Robotic Mirror Therapy System for Functional Recovery of Hemiplegic Arms
10:32

Robotic Mirror Therapy System for Functional Recovery of Hemiplegic Arms

Published on: August 15, 2016

機械力によるバイアス反応経路は,機械力によるバイアス反応経路である.

Charles R Hickenboth1, Jeffrey S Moore, Scott R White

  • 1School of Chemical Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

Nature
|March 23, 2007
PubMed
まとめ
この要約は機械生成です。

超音波からの機械的な力は,化学反応を加速し,反応経路を変更することができます. この方法は,新製品の形成を可能にし,熱または光誘導による方法とは異なるユニークな反応制御を提供します.

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科学分野:

  • メカノ化学 メカノ化学
  • ポリマー化学のポリマー化学について
  • オーガニック・シンセシス オーガニック・シンセシス

背景:

  • 化学反応は通常,活性化バリアを克服するためにエネルギー投入 (熱,光) を必要とします.
  • 機械的な力は分子を活性化させることができるが,しばしばポリマー鎖の分裂につながる.
  • 超音波は,ポリマー溶液の中で機械的な力を発生させ,潜在的な新しい反応開始方法を提供します.

研究 の 目的:

  • ポリマーの化学反応を誘発および制御するために超音波による機械力の使用を調査する.
  • 機械的な力が反応経路をバイアスし,従来の方法では入手できない製品を生成できるかどうかを調べる.

主な方法:

  • 機械的に敏感な化学群をポリマーストランドに組み込む.
  • これらのグループを含むポリマー溶液の超音波曝露.
  • 反応製品の分析と,熱または光による反応との比較.

主要な成果:

  • 超音波で誘発された機械的な力は,ポリマーストランド内の1,2-非置換ベンゾサイクロブテン同位体における再配置反応を加速させた.
  • 機械的に敏感なグループは,超音波の力を利用して,特定の電気サイクルのリング開き経路を促進しました.
  • 熱または光による反応とは異なり,超音波はトランス同位体とシス同位体の両方から同一の製品を生成しました.

結論:

  • 機械的な力,特に超音波による力は,潜在エネルギー表面を大幅に変化させ,穏やかな条件下での反応を可能にします.
  • 方向性特異的な機械力は,従来のパラメータとは異なる新しい反応制御メカニズムを提供します.
  • 記述された効果は,機械的ストレスフィールドに反応する材料の発達につながり,鎖分裂の前に反応が起こる可能性があります.