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関連する概念動画

Stability of Equilibrium Configuration01:23

Stability of Equilibrium Configuration

521
Understanding the stability of equilibrium configurations is a fundamental part of mechanical engineering. In any system, there are three distinct types of equilibrium: stable, neutral, and unstable.
A stable equilibrium occurs when a system tends to return to its original position when given a small displacement, and the potential energy is at its minimum. An example of a stable equilibrium is when a cantilever beam is fixed at one end and a weight is attached to the other end. If the weight...
521
Second Order systems I01:20

Second Order systems I

233
A servo system exemplifies a second-order system, featuring a proportional controller and load elements that ensure the output position aligns with the input position. The relationship between these components is described by a second-order differential equation. Applying the Laplace transform under zero initial conditions yields the transfer function, showing how inputs are converted to outputs in the system.
By reinterpreting the system, one can derive the closed-loop transfer function, which...
233
Second Order systems II01:18

Second Order systems II

171
In an underdamped second-order system, where the damping ratio ζ is between 0 and 1, a unit-step input results in a transfer function that, when transformed using the inverse Laplace method, reveals the output response. The output exhibits a damped sinusoidal oscillation, and the difference between the input and output is termed the error signal. This error signal also demonstrates damped oscillatory behavior. Eventually, as the system reaches a steady state, the error diminishes to zero.
171
Entropy Change in Reversible Processes01:10

Entropy Change in Reversible Processes

2.7K
In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
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Determining Order of Reaction02:53

Determining Order of Reaction

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Rate laws describe the relationship between the rate of a chemical reaction and the concentration of its reactants. In a rate law, the rate constant k and the reaction orders are determined experimentally by observing how the rate of reaction changes as the concentrations of the reactants are changed. A common experimental approach to the determination of rate laws is the method of initial rates. This method involves measuring reaction rates for multiple experimental trials carried out using...
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Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

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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関連する実験動画

Updated: Sep 10, 2025

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

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メタスタビリティは,共存する競合するオーダーで

Yasamin Masoumi1, Alberto de la Torre1,2, Gregory A Fiete1,2,3

  • 1Northeastern University, Department of Physics, Boston, Massachusetts 02115, USA.

Physical review letters
|August 27, 2025
PubMed
まとめ

この研究は,超高速のレーザーパルスを使って,競合する順序パラメータを持つシステムにおけるダイナミックな相移行を調査します. 超伝導体や宇宙学の現象を説明する 強化された秩序パラメータと メタスタブル状態を明らかにします

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations

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科学分野:

  • 凝縮物質物理学
  • 不均衡のダイナミクス
  • 宇宙学モデル

背景:

  • ダイナミック・フェーズ・トランジションは 均衡状態から遠く離れているシステムを理解するのに 極めて重要です
  • 競合する順序パラメータは,外部刺激下で複雑な行動を示します.
  • 超高速のレーザーパルスは 非均衡のダイナミクスを探す強力なツールです

研究 の 目的:

  • 競合する2つの順序パラメータを持つシステムにおける動的相変化を研究する.
  • これらのシステムに対する超高速レーザー誘発ダイナミクスの影響を分析する.
  • 超伝導体に関する実験結果を解釈し,より広範な応用を探求する.

主な方法:

  • 時間の依存性Ginzburg-Landau (TDGL) フレームワークを使用しました.
  • システムダイナミクスを調べるために分析的および数学的研究を行いました.
  • 自由エネルギー環境におけるオーダーパラメータの変動の役割を調査した.

主要な成果:

  • オーダーパラメータの 顕著な改善が観察されました レーザーパルス後の 平均フィールドの値が小さくなっています
  • 誘発性メタステーブル状態の出現を特定した
  • 熱的および非熱的波動がメタステーブル状態のダイナミクスに有意な影響を及ぼすことを明らかにした.

結論:

  • この研究は,競合する順序を持つシステムにおける超高速現象を理解するための枠組みを提供します.
  • 充電密度波を持つ超伝導体における説明できない実験結果の解釈を提示する.
  • 開発された形式主義は,キッブル・ズレックのような宇宙学モデルを含む,様々な均衡外システムに適用できます.