A semiconductor substrate comprises a semiconductor layer comprising a group III nitride as a main component. A scattering portion for scattering an incident beam of light incident on one plane of the semiconductor layer is provided on another plane or inside of the semiconductor layer.

 
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< Method and apparatus for preparing a dialkyl carbonate, and its use in the preparation of diaryl carbonates and polycarbonates

> Ce,Pr-coactivated strontium magnesium aluminate phosphor and lamp containing same
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