“pump priming”的概念、定义、翻译、参考文献-科学参考

pump priming

Chemical Engineering

Used for the start-up and successful operation of centrifugal pumps in which the casing housing the impeller is first filled or primed with liquid before operation begins. Since the density of a liquid is many times greater than that of a gas, vapour, or air, the suction pressure is otherwise insufficient to draw in more liquid. Depending on the type of pump, priming can be achieved either manually or by drawing liquid in using a vacuum pump. Valves can be used to prevent drainage and ensure that the pump does not require priming once the pump stops. Alternatively, the pump can be configured in such a way that it always maintains a reservoir of liquid at the suction side.

Economics

The theory that it is possible for the government to bring about permanent recovery from a slump by a temporary injection of purchasing power into the economy. The argument is that if incomes are low because lack of confidence in the future prevents investment, a temporary rise in government spending, financed by borrowing rather than taxes, can raise incomes through its multiplier effects, which will allow investment to recover. Once a cumulative recovery process gets going, it will be possible to remove the extra government spending. The government may even eventually receive sufficient extra tax revenue to restore government debt to its original level.

单词	pump priming
释义	pump priming Chemical Engineering Used for the start-up and successful operation of centrifugal pumps in which the casing housing the impeller is first filled or primed with liquid before operation begins. Since the density of a liquid is many times greater than that of a gas, vapour, or air, the suction pressure is otherwise insufficient to draw in more liquid. Depending on the type of pump, priming can be achieved either manually or by drawing liquid in using a vacuum pump. Valves can be used to prevent drainage and ensure that the pump does not require priming once the pump stops. Alternatively, the pump can be configured in such a way that it always maintains a reservoir of liquid at the suction side. Economics The theory that it is possible for the government to bring about permanent recovery from a slump by a temporary injection of purchasing power into the economy. The argument is that if incomes are low because lack of confidence in the future prevents investment, a temporary rise in government spending, financed by borrowing rather than taxes, can raise incomes through its multiplier effects, which will allow investment to recover. Once a cumulative recovery process gets going, it will be possible to remove the extra government spending. The government may even eventually receive sufficient extra tax revenue to restore government debt to its original level.
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