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The high frequency pulse 50-100/sec is known as dense wave, the low frequency pulse 2-5/sec termed as rarefaction wave. 频率快的叫密波（高频），一般在50-100次/秒，频率慢的叫疏波（低频），一般在2-5次/秒。
The nickel electroforming layers with nanocrystalline (nc) were obtained by using high frequency pulse current and strong electrolyte flushing. 采用高速冲液电铸装置、高频脉冲电流等方法,制备出金属镍纳米晶粒电铸沉积层。
In the paper, the high frequency pulse tube coolers (PTCs) developed for 80 K and below temperature application are introduced. 摘要首先介绍了作者开发的可用于80K及以下温区的高频脉冲管制冷机。
The paper introduction mechanism,application,selectio principal and some attentive items using of high frequency pulse TIG welding machine. 介绍高频脉冲TIG焊机的机理、用途、选型原则和使用时的注意事项。
Using a high frequency pulse radar of 300MHz, radar sounding was carried out at 150 points on Collins Ice Cap and the echo profile of bedrock in 15km distance was given. 使用一台300MHz高频脉冲雷达，对柯林斯冰帽150个测点进行冰厚探测，描绘出15km冰床雷达回波剖面。
Brazing quality and product reliability are both increased as using high frequency pulse microplasma arc heating process for assembly brazing of cathode and photoetching grid of electron tube. 采用高频脉冲微束等离子弧做为电子管阴极和光刻栅极装配钎焊工艺的热源;提高了钎缝质量和产品的可靠性.
When high frequency pulse current is applied to CC billet,the centerline pipe and centerline crack in the billet are eliminated,and the central segregation and central crack are reduced. 进行了连铸工业试验,效果明显:铸坯中心缩孔和中心裂纹被消除,中心偏析和中间裂纹也得到降低。
When high frequency pulse current is applied to CC billet, the centerline pipe and centerline crack in the billet are eliminated, and the central segregation and central crack are reduced. 进行了连铸工业试验，效果明显：铸坯中心缩孔和中心裂纹被消除，中心偏析和中间裂纹也得到降低。
They emit high frequency pulses of sound through their mouth or nose which bounce off surfaces and objects around them. 它们通过嘴或鼻子发出高频脉冲声，这些脉冲声碰到周围的表面或物体就会反射回来。
Design of High Frequency Pulse Power Supply 高频脉冲电源设计
Design of High Voltage and High Frequency Pulse Sharpening Circuit Based on Magnetic Switch 基于磁开关的高压高频脉冲陡化电路的设计
High frequency pulse eleetroforming 高频脉冲电镀
High frequency pulse power supply 高频脉冲电源
parallel / high frequency pulse DC link 并联/高频脉冲直流环节
high frequency pulse electrodeposition 高频脉冲电镀
high frequency pulse electroplating 高频脉冲电镀
high frequency pulse eleetroplating 高频脉冲电镀
high frequency pulse tube refrigeration 高频脉管制冷
high frequency pulse electric current(HFPEC) 高频脉冲电流
high frequency pulse electroforming 高频脉冲电镀