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IMAGE: 4 K pulse tube cryocooler developed by researchers at the Technical Institute of Physics and Chemistry, Chinese Academy of Sciences view more
Credit: Liubiao Chen/University of Chinese Academy of Sciences
WASHINGTON, April 6, 2021 Cryocoolers are ultracold refrigeration units used in surgery and drug development, semiconductor fabrication, and spacecraft. They can be tubes, pumps, tabletop sizes, or larger refrigerator systems.
The regenerative heat exchanger, or regenerator, is a core component of cryocoolers. At temperatures below 10 kelvins (-441.67 degrees Fahrenheit), performance drops precipitously, with maximum regenerator loss of more than 50%.
In their paper, published in
Applied Physics Letters, by AIP Publishing, researchers at the University of Chinese Academy of Sciences used superactivated carbon particles as an alternative regenerator material to increase cooling capability at temperatures as low as 4 kelvins.
Enhanced ceramics could spark the 5G revolution
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Electroluminescence at THz Frequencies Brings Silicon QCLs into Focus | Research & Technology | Mar 2021
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Tigers Can t Change Their Stripes, But Squids Can | UCSB
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VIDEO: Square norm of sound pressure in water around a designed acoustic cloak during topology optimization. view more
Credit: GARUDA FUJII, INSTITUTE OF ENGINEERING, SHINSHU UNIVERSITY, JAPAN
Until now, it was only possible to optimize an acoustic cloaking structure for the air-environment. However, with this latest research, Acoustic cloak designed by topology optimization for acoustic-elastic coupled systems, published in the latest
Applied Physics Letters, it is possible to design an acoustic cloak for underwater environments.
In the conventional topology optimization of acoustic cloaking, the design method was based on an analysis that approximated an elastic body in the air as a rigid body. However, since the approximation holds only for materials that are sufficiently stiff and dense such as metal in the air, there were few material options other than metal. Moreover, it was impossible to design an acoustic cloak in water by the approximation meth