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Related Concept Videos

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...
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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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Direction-Selective Energy Control Using Thermal Lens.

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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Summary
This summary is machine-generated.

A new directional energy control surface (DECS) passively manipulates visible and infrared light using refraction. This energy-efficient technology offers tunable thermal and optical signatures for advanced applications.

Keywords:
directional energy controldirection‐selectivemultispectral energy modulationrefraction‐based energy controlthermal lens array

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Area of Science:

  • Materials Science
  • Optics
  • Thermal Engineering

Background:

  • Directional energy control is crucial for adaptive thermal management and optical modulation.
  • Existing methods often require external power, limiting applications.

Purpose of the Study:

  • Introduce a passive, refraction-based directional energy control surface (DECS).
  • Demonstrate multiband energy manipulation across visible and infrared spectra.

Main Methods:

  • Fabrication of a three-layer DECS: directional control layer (DCL), infrared control layer (IRCL), and visible coloration layer (VCL).
  • Utilized a thermal lens array for direction-selective refraction and patterned gold/quartz for IR emissivity modulation.
  • Experimental validation of thermal and optical signature modulation based on detection angle.

Main Results:

  • The DECS achieved passive, direction-selective control of thermal and optical signatures.
  • Demonstrated effective enhancement or suppression of radiance by adjusting the detection angle.
  • Confirmed DECS functionality in complex 3D wedge geometries.

Conclusions:

  • The DECS presents a scalable, energy-efficient solution for passive multiband energy regulation.
  • This technology enables a new paradigm for spectral and angular energy control.
  • Potential applications include thermal camouflage, radiative cooling, and dynamic optical management.