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相关概念视频

Joule-Thomson Effect01:21

Joule-Thomson Effect

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The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...
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Mechanism of heat transfer01:19

Mechanism of heat transfer

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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...
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Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

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Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
324
Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
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Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

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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.
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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量子热器件中热电流控制的调节效应.

André H A Malavazi1, Borhan Ahmadi1, Paweł Mazurek1,2

  • 1International Centre for Theory of Quantum Technologies, <a href="https://ror.org/011dv8m48">University of Gdańsk</a>, Jana Bażyńskiego 1A, 80-309 Gdańsk, Poland.

Physical review. E
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概括

本研究探讨了一种三级量子热装置,证明其作为多用途工具的潜力. 添加第三个激发级增加了热电流放大和切换能力在各种温度.

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科学领域:

  • 量子热力学就是量子热力学.
  • 纳米尺度的传热方式
  • 固态物理 固态物理

背景情况:

  • 量子热设备对于先进的纳米技术至关重要.
  • 已经提出了电子电流放大器和晶体管的最小模型.
  • 设备架构显著影响性能.

研究的目的:

  • 为了研究一个紧密合的三个子系统量子热装置.
  • 分析控制子系统中第三个激发级别的影响.
  • 探索该设备作为多用途热组件的潜力.

主要方法:

  • 三个子系统量子热装置的理论建模.
  • 对一个系统的分析,特别强调第三个激发水平.
  • 调查内部参数对设备功能的影响.

主要成果:

  • 拟议的设置可以作为热开关,整流器,稳定器和放大器.
  • 调节级别在设备性能和操作模式中起着至关重要的作用.
  • 在广泛的温度范围内观察到稳定且强大的放大效应.

结论:

  • 与控制温度接触的三级系统可以增加输出电流.
  • 该设备在各种温度下显示了增强的切换功能.
  • 该研究强调了考虑多层次系统对于提高量子热器件性能的重要性.