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相关概念视频

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

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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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相关实验视频

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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同时存在的竞争订单中的元稳定性

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
概括

这项研究使用超快激光脉冲探索具有竞争性顺序参数的系统中的动态相位过渡. 它揭示了增强的秩序参数和超稳定状态,解释了超导体和宇宙学的现象.

科学领域:

  • 凝聚物质物理学
  • 不平衡的动态
  • 宇宙模型

背景情况:

  • 动态相变对于理解远离平衡的系统至关重要.
  • 相互竞争的顺序参数在外部刺激下呈现复杂的行为.
  • 超快激光脉冲提供了一个强大的工具来探测不平衡的动态.

研究的目的:

  • 在具有两个竞争顺序参数的系统中研究动态相位过渡.
  • 分析激光引发的超高速动态对这些系统的影响.
  • 解释超导体的实验结果并探索更广泛的应用.

主要方法:

  • 使用了时间依赖的金兹堡-兰多 (TDGL) 框架.
  • 使用分析和数值研究来研究系统动态.
  • 研究了订单参数波动在自由能源环境中的作用.

主要成果:

  • 在激光脉冲后的平均场值较小时, 顺序参数显著增强.
  • 发现一种诱导性转移稳定状态的出现.
  • 揭示了热和非热波动对元稳态动态的显著影响.

结论:

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  • 这项研究为理解具有竞争秩序的系统中的超快现象提供了框架.
  • 提供了对充电密度波的超导体无法解释的实验发现的解释.
  • 开发的形式主义适用于多种不平衡的系统,包括像基布尔-祖雷克这样的宇宙模型.