A cooling apparatus includes a heat receiving casing thermally joined to a heating object directly or indirectly, a first device having hoses which communicate inside of the heat receiving casing, a fluid medium inside the heat receiving casing and in the hoses. The cooling apparatus also includes a solution sending pump circulating the fluid medium provided inside the heat receiving casing, and a second device having a radiator for cooling the circulated fluid medium, and a radiating fan.

 
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> Electrode employing nitride-based semiconductor of III-V group compound, and producing method thereof

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