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Mechanism of heat transfer01:19

Mechanism of heat transfer

2.3K
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 Transfer I01:14

Mechanisms of Heat Transfer I

5.8K
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.
5.8K
Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

4.5K
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...
4.5K
Radiation: Applications01:17

Radiation: Applications

1.8K
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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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...
3.2K
Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

1.9K
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...
1.9K

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Updated: May 4, 2026

Characterization of Thermal Transport in One-dimensional Solid Materials
05:20

Characterization of Thermal Transport in One-dimensional Solid Materials

Published on: January 26, 2014

22.0K

光子による単一モード熱伝導.

Matthias Meschke1, Wiebke Guichard, Jukka P Pekola

  • 1Low Temperature Laboratory, Helsinki University of Technology, PO Box 3500, 02015 TKK, Finland.

Nature
|November 10, 2006
PubMed
まとめ
この要約は機械生成です。

研究者は実験的に,光子放射が熱伝導性を媒介し,ナノ構造の量子限界G(Q) に近づいていることを実証しました. この発見は,高度なボロメーターとマイクロ冷蔵庫の開発に不可欠です.

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Characterization of Thermal Transport in One-dimensional Solid Materials

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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings

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科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • 量子熱力学とは,量子熱力学である.
  • ナノスケールの熱伝導

背景:

  • 1983年の理論的研究は,単一チャネルの熱伝導性に対する量子限界G (Q) を予測した.
  • この量子伝導性は,限られた次元における粒子タイプ (ボゾンやフェルミオン) にかかわらず独立しています.
  • 以前の研究では,フォノンによる量化熱伝搬を観察し,電子の光子媒介による冷却を予測した.

研究 の 目的:

  • 低温での光子媒介の熱伝導性を実験的に検証する.
  • 従来の伝導メカニズムが抑制されたときの熱伝達を調査する.
  • フォトンの放射を介して量子限界G(Q) を達成する可能性を調査する.

主な方法:

  • 超伝導電線で接続された2つの通常の金属の島間の熱交換を研究した.
  • フォトン放射線のスイッチとしてDC-SQUID (ジョセフソントンネルの2つの接点を持つ超伝導回路) を利用しました.
  • 電子-フォノンおよび電子伝導が最小限にある冷凍温度での測定された熱伝導率.

主要な成果:

  • 観測された熱伝達は,主に,低温での光子放射線によるものです.
  • フォトン媒介の熱伝導性が予測された量子限界G (Q) に近付いていることを実証した.
  • 超伝導電線は,従来の熱伝導に対して効果的に隔熱することを確認しました.

結論:

  • フォトン放射は熱伝導性を媒介し,基本的な量子限界に達することができます.
  • この現象は,他の熱伝達モードが抑制されているナノ構造において顕著である.
  • 発見は,敏感なボロメーターと効率的なマイクロ冷蔵庫の設計に実用的な意味を持つ.