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相关概念视频

Mechanism of heat transfer01:19

Mechanism of heat transfer

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...
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

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.
Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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...
Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

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 heat.

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相关实验视频

Updated: Jul 5, 2026

High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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使用基于相变材料的多层结构调节的定向热辐射.

Kandammathe Valiyaveedu Sreekanth1,2, Qing Yang Steve Wu1, Sambhu Jana3,4

  • 1Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore. sreekanth@imre.a-star.edu.sg.

Nanoscale horizons
|August 15, 2025
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概括
此摘要是机器生成的。

研究人员使用Sb2S3.3等相变材料 (PCM) 开发了一种可调节的新型热发射器. 该设备允许对热发射的方向和光谱范围进行动态控制,这对于先进的智能热发射器至关重要.

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科学领域:

  • 光子学是指光子学的使用方法.
  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术

背景情况:

  • 智能热发射器需要可调节的热发射的方向和光谱控制.
  • 目前的光子策略提供了有限的可调性,经常固定角度范围.

研究的目的:

  • 提出一种基于相变材料 (PCM) 的新型可调的多层结构,用于积极调节热发射中的角选择性.
  • 为了展示一个可调节角度范围的无损热发射器.

主要方法:

  • 使用交替的SiO2和Sb2S3 (高结晶温度PCM) 薄膜制造一个1.35μm可调节的多层堆.
  • 在SiO2-Sb2S3多层腔内使用可调节的布鲁斯特模式来对热辐射进行定向控制.
  • 通过微型加热器集成结构演示电控热排放.

主要成果:

  • 在宽光谱带 (10-18μm) 中,在p极化光的布鲁斯特角度实现了超过95%的峰值发射率.
  • 通过Sb2S3.3.的非挥发性相位过渡属性,证明了最大热辐射的可调节角度范围.
  • 证实了电控热发射,展示了一个多功能和不需要 lithography 的平台.

结论:

  • 开发的Sb2S3-SiO2多层结构为定向热辐射的角度范围提供了动态控制.
  • 这种可调节的光子结构适用于需要适应性热发射特性的新兴应用.
  • 该平台为先进的热发射器设计提供了一种多功能,无光刻的解决方案.