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Umbrella is a screen that can carried in the hand for sheltering the person from the rays of the sun, or from rain or snow. This is an era that we are trying to conserve energy and reduce carbon emission; therefore, we use the surface of the umbrella that we used for sheltering from the rays of the sun to absorb the solar energy to transform into usable electric power.
Jui-che Tu Ph.D
Min-chien Chang/Jui-che Tu Ph.D