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Different types of bypass valves for hybrid system control such as recuperator bypass are used to control the inlet temperature of the air entering the stack.
It divides the stack coolant into a cooling stream and a heating stream that maintains a pre-set coolant temperature before entering the stack.
The condenser circulation system could be further improved to dynamically control the temperature of the condenser, as it is directly related to the humidification of the air entering the stack as mentioned above.
In PEM (polymer electrolyte membrane or proton exchange membrane) fuel cells the oxygen excess ratio expresses the proportion between oxygen reacting in the cells and oxygen entering the stack and represents a decisive variable for the mentioned issues.
The oxygen excess ratio expressing the proportion between oxygen reacting in the cells and oxygen entering the stack is widely used to guarantee safety and to reach a high performance.
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According to the Harvard College Library's own description, Widener's humanities and social sciences collections include Again alone among the "megalibraries", only Widener allows patrons the "long-treasured privilege" of entering the stacks to browse as they please, instead of requesting books through library staff.
Air temperature will elevate during compressing, so an air cooler is needed to cool the air before it enters the stack.
On my first day at Butler Library I climbed the familiar grand staircase under the portrait gaze of Dwight D. Eisenhower and entered the stacks to select books by recent scholars on my subject.
By then female graduate students were permitted to enter the stacks, but only until 5p.m., "after which time it was thought they would not be safe there".
Inability to enter the stacking gel is not a definitive indication of proteolysis resistance since partial hydrolysis may result in products smaller than fibrils and/or protofibrils yet still large enough to be retained in the stacking gel.
Twenty micrograms of each sample were loaded at 4°C into 5×1.5 mm gel wells and were at first run until they have entered the stacking gel, typically 80 V for 30 40 min, after which the voltage was increased to 100 V and the blue cathode buffer was replaced by an uncoloured buffer.
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