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相关概念视频

Maximum Power Transfer01:16

Maximum Power Transfer

262
Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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Joule-Thomson Effect01:21

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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.
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There are three methods by which heat transfer can take place: conduction, convection, and radiation. Each method has unique and interesting characteristics, but all three have two things in common: they transfer heat solely because of a temperature difference; and the greater the temperature difference, the faster the heat transfer.
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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.
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向优化宽度调制实现最大的热电效率.

Antonios-Dimitrios Stefanou1, Xanthippi Zianni1

  • 1Department of Aerospace Science and Technology, School of Science, National and Kapodistrian University of Athens, 34400 Psachna, Greece.

Micromachines
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PubMed
概括
此摘要是机器生成的。

在纳米结构中优化热电效率需要考虑电子和声子传输. 无周期宽度调制,创造准局部化的电子状态,最大限度地提高热电效率.

关键词:
电子运输是一种电子运输.超材料是指金属材料.音声传输 传输 音声传输导热传导的热传导方式热电效率的热电效率是什么宽度调节的纳米波导向器

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科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 材料科学是一种材料科学.
  • 纳米技术纳米技术

背景情况:

  • 最大限度地提高热电效率传统上侧重于最大限度地减少热导,假设对电子传输的影响最小.
  • 这种假设对于非均的纳米结构,如宽度调制纳米波导,通常是无效的,因为电子和声子都受到影响.

研究的目的:

  • 研究调制幅度对电子和声子传输的影响,以优化宽度调制纳米波导的热电效率.
  • 通过分析不同的调制配置文件,探索最大限度地提高元材料热电效率的策略.

主要方法:

  • 研究了增加调制度对热电效率的影响.
  • 在周期和非周期序列中分析了双量子点 (QD) 和多个QD调制.
  • 检查了调制单元之间的合的影响以及周期性/非周期性的相互作用.

主要成果:

  • 热电效率取决于调制单元之间的合和调制配置文件的周期性.
  • 周期宽度调制最大化了热电功率因子.
  • 无周期宽度调制配置文件,形成准局部电子状态,最大限度地提高整体热电效率.

结论:

  • 对非均纳米结构来说,重新考虑热电效率的传统方法至关重要.
  • 周期性宽度调制通过控制电子定位提供了一个有希望的途径,通过控制电子定位来提高热电性能.
  • 这项研究为设计先进的热电超材料提供了洞察力.