Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Heat Engines01:10

Heat Engines

3.9K
A heat engine is a device used to extract heat from a source and then convert it into mechanical work used for various applications. For example, a steam engine on an old-style train can produce the work needed for driving the train.
Whenever we consider heat engines (and associated devices such as refrigerators and heat pumps), we do not use the standard sign convention for heat and work. For convenience, we assume that the symbols Qh, Qc, and W represent only the amounts of heat transferred...
3.9K
The Carnot Cycle01:30

The Carnot Cycle

4.4K
Converting work to heat is an irreversible process, and the purpose of a heat engine is to reverse the effect partially. Heat engines aim to increase the efficiency of the reversal, that is, maximize the work retrieved from heat. If the efficiency of a heat engine were 100%, it would imply reversing the process completely without introducing any other effect. Thus, it would violate the second law of thermodynamics.
What could be the theoretical limit to the efficiency of a heat engine? The...
4.4K
Statements of the Second Law of Thermodynamics01:15

Statements of the Second Law of Thermodynamics

5.2K
The second law of thermodynamics can be stated in several different ways, and all of them can be shown to imply the others. The Clausius’ statement of the second law of thermodynamics is based on the irreversibility of spontaneous heat flow. It states that heat will not flow from the colder body to the hotter body unless some other process is involved. Additionally, as per the Kelvin’s statement, it is impossible to convert the heat from a single source into work without any other...
5.2K
Mechanism of heat transfer01:19

Mechanism of heat transfer

2.2K
Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
2.2K
The Carnot Cycle and the Second Law of Thermodynamics01:20

The Carnot Cycle and the Second Law of Thermodynamics

4.1K
The Carnot engine works between two heat reservoirs of fixed temperatures. The Carnot cycle begs the following question: Is it possible to devise a heat engine that is more efficient than a Carnot engine between two fixed temperatures? The answer lies in designing a Carnot refrigerator.
Since the individual steps in a Carnot cycle can be reversed, the entire cycle is, thus, reversible. If a Carnot cycle is reversed, it becomes a Carnot refrigerator. It extracts heat Qc from a cold reservoir at...
4.1K
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

7.1K
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
7.1K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Strong-damping limit of quantum Brownian motion in a disordered environment.

Physical review. E·2026
Same author

Fractional Control Gate Protocols for Quantum Engines.

Entropy (Basel, Switzerland)·2026
Same author

Fundamental limits on nonequilibrium sensing.

Nature communications·2025
Same author

Correlated quantum machines beyond the standard second law.

Science advances·2025
Same author

Experimental realization and synchronization of a quantum van der Pol oscillator.

Science advances·2025
Same author

Noise-induced quantum synchronization with entangled oscillations.

Nature communications·2025
Same journal

Erratum for the Research Article "Detecting supramolecular organic nanoparticles during heat wave".

Science (New York, N.Y.)·2026
Same journal

Local signals, systemic decline.

Science (New York, N.Y.)·2026
Same journal

The mechanics of liver regeneration.

Science (New York, N.Y.)·2026
Same journal

Computing in a memory with physics.

Science (New York, N.Y.)·2026
Same journal

Retraction.

Science (New York, N.Y.)·2026
Same journal

Making time.

Science (New York, N.Y.)·2026
查看所有相关文章

相关实验视频

Updated: Mar 22, 2026

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
09:09

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

Published on: February 5, 2020

7.7K

一个单原子热发动机

Johannes Roßnagel1, Samuel T Dawkins2, Karl N Tolazzi3

  • 1QUANTUM, Institut für Physik, Universität Mainz, D-55128 Mainz, Germany. j.rossnagel@uni-mainz.de ks@uni-kassel.de.

Science (New York, N.Y.)
|April 16, 2016
PubMed
概括
此摘要是机器生成的。

研究人员制造了第一台单原子热发动机. 这种突破性的装置使用被捕获的离子将热能转化为机械工作,

更多相关视频

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
14:58

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

15.5K
Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
04:09

Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics

Published on: August 30, 2024

856

相关实验视频

Last Updated: Mar 22, 2026

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
09:09

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

Published on: February 5, 2020

7.7K
Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
14:58

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

15.5K
Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
04:09

Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics

Published on: August 30, 2024

856

科学领域:

  • 热力学
  • 量子力学
  • 原子物理

背景情况:

  • 传统的热发动机使用大量的粒子.
  • 了解纳米级的热传递对于开发新技术至关重要.

研究的目的:

  • 通过实验展示一个功能性的单原子热发动机.
  • 研究原子级发动机的热力学循环和性能.

主要方法:

  • 将单个离子限制在一个线性波尔陷中.
  • 将离子合到热和冷储以驱动热循环.
  • 测量离子动力学以确定热力学周期和提取功率.

主要成果:

  • 一个单原子热发动机成功运行.
  • 获得的输出功率P=3.4 × 10(-22) 焦尔每秒,效率 η=0.28%.
  • 结果与原子级热力学周期的理论预测一致.

结论:

  • 证明了单原子热发动机的可行性.
  • 展示了热机器可以缩小到单原子的极限.
  • 开辟了量子热力学和纳米能量转换的新途径.