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相关概念视频

Heating and Cooling Curves02:44

Heating and Cooling Curves

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When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
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Quantifying Heat02:46

Quantifying Heat

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Thermal Energy Microscopically, thermal energy is the kinetic energy associated with the random motion of atoms and molecules. Temperature is a quantitative measure of “hot” or “cold”, which depends on the amount of thermal energy. When the atoms and molecules in an object are moving or vibrating quickly, they have a higher average kinetic energy (KE) (or higher thermal energy), and the object is perceived as “hot”, or it is described as being at a...
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Path Between Thermodynamics States01:21

Path Between Thermodynamics States

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Consider the two thermodynamic processes involving an ideal gas that are represented by paths AC and ABC in Figure 1:
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Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in...
2.2K
Zeroth Law of Thermodynamics01:14

Zeroth Law of Thermodynamics

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Experimentally, if object A is in equilibrium with object B, and object B is in equilibrium with object C, then object A is in equilibrium with object C. That statement of transitivity is called the "zeroth law of thermodynamics." For example, a cold metal block and a hot metal block are both placed on a metal plate at room temperature. Eventually, the cold block and the plate will be in thermal equilibrium. In addition, the hot block and the plate will be in thermal equilibrium.
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Temperature and Thermal Equilibrium01:11

Temperature and Thermal Equilibrium

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Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...
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相关实验视频

Updated: Sep 11, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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量子点接触几何学中的自身状态热化假设.

G C Levine1, B A Friedman1

  • 1Sam Houston State University, Hofstra University, Department of Physics, Hempstead, New York 11549, USA and Department of Physics, Huntsville, Texas 77341, USA.

Physical review. E
|August 19, 2025
PubMed
概括
此摘要是机器生成的。

自由费米子系统表现出量子纠,导致热化. 即使没有相互作用,这些系统在通过量子点接触与水库相合时也满足了固态热化假设.

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Characterization of Thermal Transport in One-dimensional Solid Materials
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科学领域:

  • 量子物理学的量子物理学
  • 凝聚物质理论 凝聚物质理论
  • 统计力学就是统计力学.

背景情况:

  • 自由费米子系统表现出远程量子纠,使子系统热化成为可能.
  • 固态热化假设 (ETH) 通常应用于相互作用的系统,但其适用于非相互作用的费米子也得到了探索.

研究的目的:

  • 在与量子储库最小合的自由费米离子系统中研究ETH.
  • 检查通过量子点接触 (QPC) 连接的系统中的纠.

主要方法:

  • 纠的分析和数值检查.
  • 专注于通过一个或多个QPC连接到有限能量和基本状态的系统.

主要成果:

  • 纠是次扩展的,在典型兴奋状态下与子系统大小 (L_A) 线性缩放.
  • 在低能量和小子系统下,纠 entropy 尺度为 S_A ~ L_A * E.
  • 每个QPC的量化增量被建议: ΔS_A = αlog(1/E) sinh(L_A * E).

结论:

  • 在最小合的自由费米离子系统中,低范围的纠 Entropy 与经典和量子混沌系统形成鲜明对比.
  • 这些发现表明,在特定的系统中,通过QPC转移的量子化性质.