| http://www.w3.org/ns/prov#value | - In 1974, Brown (U.S.A.) achieved magnetic refrigeration at room temperature for the first time, by using a ferromagnetic substance Gd plate having a ferromagnetic phase transition temperature (Tc) of about 294 K. Unfortunately, although the refrigeration cycle was continuously operated in the experiment, there were some problems such as heat transfer in a refrigeration cycle, because an integral G
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