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Both Bosch and cryogenic processes can fabricate 90° (truly vertical) walls, but often the walls are slightly tapered, e.g. 88° ("reentrant") or 92° ("retrograde"). Another mechanism is sidewall passivation: SiO x F y functional groups (which originate from sulphur hexafluoride and oxygen etch gases) condense on the sidewalls, and protect ...
Dylan Marie Dreyer (born August 2, 1981) [1] is an American television meteorologist working for NBC News. She is also an anchor on Today's 3rd Hour. She is also an anchor on Today's 3rd Hour. Dreyer frequently appears on Today on weekdays as a weather correspondent and as a fill-in for Al Roker and Carson Daly .
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