A photocatalyst device includes a photocatalyst member and a light source. The light source is configured to emit ultraviolet light to the photocatalyst member. The ultraviolet light has a wavelength equal to or less than about 400 nanometers, and more than 365 nanometers.

 
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> Multi-spectral, selectively reflective construct

> Method for Connection At Least Two Pieces of Sheet Material, Particularly At Least Two Metal Sheets for a Lightweight Structure As Well a Joining and Lightweight Structure
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