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Degradation in pinch-off voltage. This is a common failure mode for gallium arsenide devices operating at high temperature, and primarily stems from semiconductor-metal interactions and degradation of gate metal structures, with hydrogen being another reason. It can be hindered by a suitable barrier metal between the contacts and gallium arsenide.
The positive pressure test checks that the unit will not lose gas while in use, and the negative pressure test ensures that water will not leak into the breathing loop where it can degrade the scrubber medium or the oxygen sensors. [5] A test and calibration of the oxygen sensors is part of the pre-dive or daily checks for rebreathers which use ...
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The Fukushima Daiichi nuclear disaster in 2011 occurred due to a loss-of-coolant accident. The circuits that provided electrical power to the coolant pumps failed causing a loss-of-core-cooling that was critical for the removal of residual decay heat which is produced even after active reactors are shut down and nuclear fission has ceased.
"Frost-Free" refrigerator/freezer units usually use a heating element to defrost their evaporators, a pan to collect and evaporate water from the frost that melts from the cold plate and/or evaporator coil, a timer which turns off the compressor and turns on the defrost element usually from once to 4 times a day for periods usually ranging from ...
To prevent the salt concentration of the water from becoming too high, a portion of the water is drawn off or blown down (D) for disposal. Fresh water make-up (M) is supplied to the tower basin to compensate for the loss of evaporated water, the windage loss water and the draw-off water. Fan-induced draft, counter-flow cooling tower
In the first attack, on Sept. 29, 2009, Muller allegedly broke into a woman’s home in Mountain View, tied her up, forced her drink a mix of medications and told her he was going to rape her ...
A teenager who repeatedly stabbed schoolgirl Elianne Andam in a row over a teddy bear has been found guilty of her murder. Hassan Sentamu, then 17, attacked the 15-year-old outside a shopping ...