America celebrates the 250th anniversary of its independence today, with people from one end of the country to the other ...
Fourth of July celebrations are taking place across the nation as the US turns 250, including in Washington, DC, where President Donald Trump will give an address this evening. Follow live updates.
Abstract: The solid-state lighting is revolutionizing the indoor illumination. Current incandescent and fluorescent lamps are being replaced by the LEDs at a rapid pace. Apart from extremely high ...
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