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相关概念视频

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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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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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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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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Conduction, Convection and Radiation: Problem Solving01:20

Conduction, Convection and Radiation: Problem Solving

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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.
In order to solve a problem related to heat transfer, first of all, the situation needs to be examined to determine the type of heat transfer involved. This could...
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Radiation: Applications01:17

Radiation: Applications

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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
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Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
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辐射热传递和二维过渡金属二甲基化物材料

Long Ma1, Dai-Nam Le1, Lilia M Woods1

  • 1Department of Physics, University of South Florida, Tampa, Florida 33620, United States.

The journal of physical chemistry letters
|October 23, 2025
PubMed
概括

这项研究探讨了过渡金属二甲基化物单层中的辐射热传递,揭示了它们独特的特性如何增强能量收获. 结果提供了对设计材料的洞察力,用于高效的热能应用.

科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 材料科学 材料科学 材料科学
  • 纳米技术 纳米技术

背景情况:

  • 辐射热传递对于基础科学和能源采集至关重要.
  • 材料特性,如等离子体激发和高波性,显著影响热传递,特别是在近场状态下.
  • 与散装材料相比,缩小尺寸的材料,如单层材料,提供了与散装材料相比增强辐射热传递的潜力.

研究的目的:

  • 为了研究过渡金属二甲基化物 (TMD) 单层中的辐射传热功率.
  • 在这种情况下,理解金属和半导体的缩放规律.
  • 识别可控制的特定材料特征,以优化辐射热传递.

主要方法:

  • 利用第一原理计算计算TMD单层的电子和光学特性.
  • 采用有效的模型来分析基于计算属性的辐射热传递.
  • 结合分析建模与初始模拟结果.

主要成果:

  • 在H-和T-对称的TMD单层中确定了不同的辐射热传递行为.
  • 揭示了金属和半导体TMD中辐射热传递的新兴缩放规律.
  • 证明了特定的材料特性可以作为传热的控制按.

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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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结论:

  • 过渡金属二甲基化物单层表现出可调节的辐射热传递特性.
  • 该研究为设计用于增强热能应用的材料提供了一个框架.
  • 结合计算和建模方法可以扩展到创建辐射传热材料数据库.