The invention relates to a novel application of puerarin and derivates thereof in the pharmaceutical field. The puerarin and the derivates thereof have a COX-2-selective inhibition effect, are safe in use without toxic side effect, and have notable effectiveness. The puerarin and the derivates there.....
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The present invention relates to a piezoelectric ceramic transformer down new structure and preparation methods. It uses the input and output of a series arrangement of the electrical resonance of the piezoelectric ceramics, the low voltage at the output terminal and the output electric power to obt.....
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The invention provides a freeform lens, which comprises a body (1) with a substantially bowl-shaped structure formed by a transparent material; the bottom of the body sinks inwards to form a light source area (2) which can accommodate an LED; the surface, surrounding the light source area (2), of th.....
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