Word: layer
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...soon as the Crimson opened up its lead, Harvard Coach Frank McLaughlin rapidly started shuffling new players into the lineup. Mark Hadley eagerly hit three short jump shots and Douglas McIntosh popped two jumpers, one from the ozone layer, to keep the pressure on the Judges. Meanwhile, Harrigan scored ten points of his own to prevent the Crimson from opening a wider...
...silk-screening, a chip's complex circuitry is created a layer at a time. It is a slow, painstaking and error-prone procedure...
First, racks of wafers are placed in long cylindrical ovens filled with extremely hot (about 2,000° F.) oxygen-containing gas or steam. In effect, the wafers are rusted-covered by a thin, electrically insulating layer of silicon dioxide that prevents short-circuiting. Then the wafers are coated with still another substance: the resist, a photographic-type emulsion sensitive only to ultraviolet (UV) light. (To prevent accidental exposure, clean rooms are generally bathed in UV-less yellow light.) Next, a tiny mask, scaled down photographically from a large drawing and imprinted with hundreds of identical patterns of one layer...
Back in the ovens, the wafers are baked again in an atmosphere of gases loaded with "dopants." Like oil stains in a concrete driveway, these impurities soak into the underlying silicon. Since chips usually contain as many as ten layers, all these steps-"rusting," photomasking, etching, baking, etc.-must be repeated for each layer. Then the entire wafer is coated with an aluminum conductor, which also must be masked, etched and bathed in acid. Finally, an eagle-eyed computerized probe scans the wafer for defective circuitry and marks the bad chips in red. The wafer is then separated...
...seemed "beautiful but a little scaring" to Italian Tenor Luciano Pavarotti. No, not New York's newest layer of flaky white; rather, he was describing the Metropolitan Opera's first solo recital, which he was about to give at Lincoln Center. His audience: some 4,000 Met patrons plus 12 million public-television viewers. "When opera went to TV," reflected Pavarotti, "people could see it's not so stupid as they thought if it's well done. It's like antique furniture." Come again, Luciano? "You either like...