多级脉冲气体松弛岩层地应力压裂地层的过程中裂缝内爆燃气体压力分布影响裂缝起裂扩展。
Multistage pulse gas is flabby in the process of layer of terrane crustal stress fracture deflagrate inside break aeriform pressure is cracked since distributinging influence break patulous.
介绍了国外最新开展的关于脉冲管制冷机的研究方向：无阀压缩机驱动的多级脉冲管制冷机。
The newest research direction about pulse tube refrigerator is multi-stage cryocooler driven by valveless compressor.
本文叙述了一个为1MV强流脉冲电子束加速器配置的主开关。多级气体开关的设计和实验结果。
This paper describes the development and testing of a multistage gas switch used in a high-current pulsed electron beam accelerator.
单级高频脉冲管制冷机直接降低到20K以下温区存在很大困难，采用多级方案是高频脉冲管制冷机获得更低温度的主要方法。
Use single stage version to reach the temperature of 20 K is a difficulty for high frequency pulse tube cooler (PTC). Multi-stage version is a popular method to reach the low temperature.
单级高频脉冲管制冷机直接降低到20K以下温区存在很大困难，采用多级方案是高频脉冲管制冷机获得更低温度的主要方法。
Use single stage version to reach the temperature of 20 K is a difficulty for high frequency pulse tube cooler (PTC). Multi-stage version is a popular method to reach the low temperature.
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