a steam injector is typically used to deliver cold water to a boiler against its own pressure, using its own live or exhaust steam, replacing any mechanical pump.when first developed, its operation was intriguing because it seemed paradoxical, almost like perpetual motion, but it was later explained using thermodynamics. other types of injector may use other pressurised motive fluids such as air.
second the positive displacement pump backs up the momentum transfer pump by evacuating to low vacuum the accumulation of displaced molecules in the high vacuum pump. entrapment pumps can be added to reach ultrahigh vacuums, but they require periodic regeneration of the surfaces that trap air molecules or ions.
the rolls-royce griffon is a british 37-litre 2,240 cu in capacity, 60-degree v-12, liquid-cooled aero engine designed and built by rolls-royce limited.in keeping with company convention, the griffon was named after a of prey, in this case the griffon vulture.. design work on the griffon started in 1938 at the request of the fleet air arm, for use in new aircraft designs such as the .
the atp-binding cassette transporters abc transporters are a transport system superfamily that is one of the largest and possibly one of the oldest gene families.it is represented in all extant phyla, from prokaryotes to humans.. abc transporters often consist of multiple subunits, one or two of which are transmembrane proteins and one or two of which are membrane-associated aaa atpases.
a permeable reactive barrier prb , also referred to as a permeable reactive treatment zone prtz , is a developing technology that has been recognized as being a cost-effective technology for in situ at the site groundwater remediation. prbs are barriers which allow some—but not all—materials to pass through.
an airlift pump is a pump that has low suction and moderate discharge of liquid and entrained solids. the pump injects compressed air at the bottom of the discharge pipe which is immersed in the liquid. the compressed air mixes with the liquid causing the air-water mixture to be less dense than the rest of the liquid around it and therefore is .
the secondary salt was lif-bef 2 66–34 mole % .. pump. the bowl of the fuel pump was the surge space for the circulating loop, and here about 50 us gallons per minute 190 l/min of fuel was sprayed into the gas space to allow xenon and krypton to escape from the salt. removing the most significant neutron poison xenon-135 made the reactor safer and easier to restart.