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相关概念视频

Thermal Stress01:09

Thermal Stress

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If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
3.2K
Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

2.4K
Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred...
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Updated: Jan 6, 2026

Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass ADG Fresnel Lens for Concentrating Photovoltaics
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使用热透镜进行方向选择性能量控制.

Juyeong Nam1, Injoong Chang1, Joon-Soo Lim1

  • 1Department of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea.

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概括
此摘要是机器生成的。

一个新的定向能量控制表面 (DECS) 通过折射来被动操纵可见光和红外光. 这种节能技术为先进应用提供可调节的热和光学信号.

关键词:
指向能量控制指向能量控制选择性方向-选择性方向多光谱能量调制.基于折射的能量控制.热透镜阵列是一个热透镜阵列.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 光学是什么?光学是什么?光学是什么?
  • 热力工程是热力工程中的一个.

背景情况:

  • 定向能量控制对于适应性热管理和光学调制至关重要.
  • 现有的方法通常需要外部电源,限制了应用.

研究的目的:

  • 引入一个被动的,基于折射的定向能量控制表面 (DECS).
  • 在可见光谱和红外光谱中演示多频段能量操纵.

主要方法:

  • 三层DECS的制造:定向控制层 (DCL),红外控制层 (IRCL) 和可见色彩层 (VCL).
  • 使用热透镜阵列进行方向选择性折射,并采用金/石英图案进行IR发射率调制.
  • 基于检测角度的热和光学信号调制的实验验证.

主要成果:

  • DECS实现了热和光学信号的被动,方向选择性控制.
  • 通过调整检测角度,证明有效增强或抑制辐射.
  • 在复杂的3D形几何学中确认了DECS功能.

结论:

  • DECS为被动多频段能源调节提供了一个可扩展,节能的解决方案.
  • 这项技术为光谱和角度能量控制提供了一个新的范式.
  • 潜在的应用包括热伪装,辐射冷却和动态光学管理.