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Cyclic Processes And Isolated Systems01:19

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A thermodynamic system with zero heat exchange and work is an isolated system. For these systems, the internal energy remains constant.
In the case of a non-isolated system, the change in the internal energy is zero only if the process is cyclic. A thermodynamic process is considered cyclic if the system undergoes a series of changes and returns to its initial state. 
Consider a cyclic process that returns to its initial state, undergoing a four-step process. The heat transfer along each...
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Woodward–Hoffmann Selection Rules and Microscopic Reversibility

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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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Mechanical Systems01:22

Mechanical Systems

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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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Pericyclic Reactions: Introduction01:17

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Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
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A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
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Radical Chain-Growth Polymerization: Mechanism01:09

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into...
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競合相互作用を持つ周期パターン形成系におけるラチェット効果

C Reichhardt1, C J O Reichhardt1

  • 1Los Alamos National Laboratory, Theoretical Division and Center for Nonlinear Studies, Los Alamos, New Mexico 87545, USA.

Physical review. E
|December 23, 2025
PubMed
まとめ
この要約は機械生成です。

振動相互作用を伴うパターン形成系において、新規な集団ラチェット効果が現れる。研究者らは、粒子相互作用の振動により、正および逆ラチェット効果の両方を観察し、最適な効率は相互作用強度と周波数に依存することを示した。

キーワード:
ラチェット効果パターン形成ソフトマター非線形力学粒子輸送

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科学分野:

  • 物理学
  • ソフトマター物理学
  • 非線形力学

背景:

  • ラチェット効果は通常、交流駆動下での不斉ポテンシャルや、振動基板を持つ熱システムに生じる。
  • 以前の研究では、ラチェット現象のために個々の粒子の運動や熱ゆらぎに焦点が当てられていた。

研究 の 目的:

  • パターン形成系における新しいタイプの集団ラチェット効果を調査すること。
  • 不斉基板に結合された際の振動相互作用ポテンシャルの影響をシステムダイナミクスに探求すること。

主な方法:

  • 競合する短距離引力と長距離斥力を持つ粒子をシミュレーションした。
  • 結晶状態とバブル状態の間を周期的に変化させるために、引力と斥力の相互作用項の比率を周期的に振動させた。
  • 不斉基板上での正および逆ラチェット効果の出現を解析した。

主要な成果:

  • 外部力だけでなく、振動相互作用ポテンシャルによって駆動される集団ラチェット効果を実証した。
  • 正および逆ラチェット効果の両方が観察され、方向性のある輸送制御が可能であることが示された。
  • ラチェット効率の最適な条件が特定され、相互作用強度、交流駆動周波数、粒子密度に関する極大値が示された。

結論:

  • 本研究は、パターン形成系における明確な集団ラチェット機構を明らかにする。
  • この機構は、不斉基板上での調整可能な相互作用を用いた粒子輸送制御の新しいルートを提供する。
  • 本研究の結果は、相互作用ポテンシャルを調節できる多様なパターン形成系に適用可能である。