(Encyclopedia) thyristor, semiconductor switch used chiefly in power-control applications. Also called a silicon-controlled rectifier (SCR; see rectifier), it is a variation of the transistor. A…
WHY DID THE FRENCH RISE UP? WHAT HAPPENED ON JULY 14? BIOGRAPHY: MAXIMILIEN DE ROBESPIERRE 1758–1794 REIGN OF TERRORFIND OUT MOREThe years 1789 to 1799 marked a turning point in European history.…
Proof by Contradiction: The Advantage of Being IndirectGeometryTaking the Burden out of ProofsThe Law of DetachmentThe Importance of Being DirectProof by Contradiction: The Advantage of Being…
(Encyclopedia) winch, mechanical device for hauling or lifting consisting essentially of a movable drum around which a cable is wound so that rotation of the drum produces a drawing force at the end…
(Encyclopedia) Niagara Falls, in the Niagara River, W N.Y. and S Ont., Canada; one of the most famous spectacles in North America. The falls are on the international line between the cities of…
THE WORLD IN 1900 WHY DID EUROPEANS WANT TO RULE THE WORLD? HOW WERE PEOPLE TREATED BY THEIR RULERS? BRITISH RAJSCRAMBLE FOR AFRICAFRENCH FOREIGN LEGIONFIND OUT MOREFrom the 19th century until the…
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The US Supreme Court has presided over numerous landmark cases, with many having a significant social, cultural and environmental impact on the United States. Here we provide…
inventorBorn: 25 May 1902Best Known as: co-creator of the silicon solar cell Chemist Calvin Fuller, along with Bell Labs colleagues Daryl Chapin and Gerald Pearson,…
