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2. Cryocooler - Wikipedia

   en.wikipedia.org/wiki/Cryocooler

   Fig.5 is a schematic diagram. Helium at pressures in the 10–30 bars (150–440 psi) range is the working fluid. The cold head contains a compression and expansion space, a regenerator, and a displacer. Usually the regenerator and the displacer are combined in one body.

3. Pulse tube refrigerator - Wikipedia

   en.wikipedia.org/wiki/Pulse_tube_refrigerator

   In so-called dry magnets, coolers are used so that no cryoliquid is needed at all or for the recondensation of the evaporated helium. Also the combination of cryocoolers with 3 He- 4 He dilution refrigerators [ 23 ] for the temperature region down to 2 mK is attractive since in this way the whole temperature range from room temperature to 2 mK ...

4. Dilution refrigerator - Wikipedia

   en.wikipedia.org/wiki/Dilution_refrigerator

   This is a heat resistance at the surface between the helium liquids and the solid body of the heat exchanger. It is inversely proportional to T 4 and the heat-exchanging surface area A . In other words: to get the same heat resistance one needs to increase the surface by a factor 10,000 if the temperature reduces by a factor 10.

5. Prices of chemical elements - Wikipedia

   en.wikipedia.org/wiki/Prices_of_chemical_elements

   This is a list of prices of chemical elements. Listed here are mainly average market prices for bulk trade of commodities. ... Helium: 0.0001785: 0.008 ...

6. Teens charged with ‘heinous’ murder of missing girl found ...

   www.aol.com/2-teens-charged-heinous-murder...

   Two teenage girls have been charged in the “heinous” murder of a missing 13-year-old girl who was found bludgeoned, stabbed and burned to death.

7. FBI did not send undercover operatives to join Jan. 6 attack ...

   www.aol.com/news/fbi-did-not-send-undercover...

   WASHINGTON (Reuters) -A U.S. Justice Department watchdog report released on Thursday debunked claims by far-right conspiracy theorists who falsely alleged that FBI operatives were secretly ...

8. Cryogenics - Wikipedia

   en.wikipedia.org/wiki/Cryogenics

   Nitrogen is a liquid under −195.8 °C (77.3 K).. In physics, cryogenics is the production and behaviour of materials at very low temperatures.. The 13th International Institute of Refrigeration's (IIR) International Congress of Refrigeration (held in Washington DC in 1971) endorsed a universal definition of "cryogenics" and "cryogenic" by accepting a threshold of 120 K (−153 °C) to ...

9. Billabong, Quiksilver and Volcom stores to close in US after ...

   www.aol.com/billabong-quiksilver-volcom-stores...

   A sign adorns a Billabong store in Sydney' s CBD on August 28, 2014, as the embattled Australian surfwear firm posted a 218.2 million USD net annual loss.