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The rock-breaking mechanism, assisted rock-breaking mechanism of this new drilling technology is analyzed, and the lab rock-breaking experiment of post-mixed pulsed abrasive water jet is carried out.

提出了井底岩屑磨料脉冲射流钻井的技术构想,设计了相关的工具,分析了井底岩屑磨料脉冲射流破岩、辅助破岩的机理,进行了后混合磨料脉冲射流破岩室内实验研究。

The results show that the erosion volume grows with the increment of pump pressure, there are best rock-breaking jet length, abrasive concentration and particle size. In low concentration, the erosion energy of post-mixed pulsed abrasive jet is close to the pre-mixed pulsed abrasive jet. After the external fluid is drawn in, the jet dynamic pressure increases by 7%, while pulse amplitude increases by 150%.

结果表明:冲蚀体积随泵压增大而增加,存在破岩的最佳喷距、磨料浓度和磨料粒径;在较低浓度下,后混合磨料脉冲射流的冲蚀性能较接近于前混合磨料脉冲射流;引入外部流体后射流的动压力增大了7%,脉冲幅值提高了1.5倍。

The model of the outer layer hard and inter layer soft magnetic structure was suggested that the amorphous ribbon and wire are constituted by the relatively"hard" magnetic"shell"with relatively high magnetic coercivity and relatively"soft"magnetic "core"with relatively low magnetic coercivity.

非晶材料的尖锐脉冲电压现象是由于具有显著的不可逆壁移磁化过程导致大巴克豪森跳跃所造成的,脉冲的尖锐性与动态磁滞回线的形态密切相关,回线的方形度越高,则脉冲愈尖锐。

A parameter design method for pulse Doppler radar under high PRF is given in this paper.

提出了在高重频工作方式下对地脉冲多普勒雷达的参数设计方法,并在此参数设计前提下,提出了参差脉冲重复频率下脉冲多普勒雷达解距离模糊的解析法。

It firstly did numerical simulation towards pulsed liquid jet pump's throat pipe when it was working on different area ratio, different length of throat pipe, different working situation. Then it analyzed and proposed the optimization length of throat pipe on pulsed liquid jet pump; In chapter 5, it did experimental study on the fundamental performance of steady and pulsed liquid jet pump, then compared the experiment result with numerical simulation result, this approximately agreed with each other.

首次对脉冲液体射流泵在不同面积比、不同喉管长、不同工况下的喉管内部流场进行了数值模拟,分析提出了脉冲液体射流泵的最优喉管长度范围;第五章对恒定、脉冲液体射流泵的基本性能进行了试验研究,对比试验结果和数值模拟结果,二者吻合较好。

The most common form of UWB is Impulse Radio,which communicates using very short pulses,typically on the order of hundreds of picoseconds.

脉冲无线电是超宽带的最主要形式,它使用脉冲宽度级数为几百皮秒的短脉冲进行通信。

The transit time and gain characteristics of electrons which travel in the micro-channel plate gated by picoseconds high voltage pulse were simulated.

对皮秒高压脉冲驱动下微通道板中电子的渡越时间特性和增益特性进行了数值模拟,在电压脉冲波形分别为高斯形、三角形和梯形时,得到了电子渡越时间与电压脉冲宽度、幅度的关系曲线。

The transit time and gain characteristics of electrons which travel in the micro-channel plate gated by picoseconds high voltage pulse were simulated. The curves of the transit time versus the voltage pulse width and the voltage amplitude are obtained when the waveforms of the voltage pulse are Gauss, triangle and trapezoid.

对皮秒高压脉冲驱动下微通道板中电子的渡越时间特性和增益特性进行了数值模拟,在电压脉冲波形分别为高斯形、三角形和梯形时,得到了电子渡越时间与电压脉冲宽度、幅度的关系曲线。

The characteristics of different implementation of the fiber-optic pulse replicators based on different techniques are compared according to the different performance requirements of insertion loss, periodicity and power stability of the output pulses in various applications.

针对常用的多路高速光脉冲复制系统可能的实现形式进行了研究,根据各种应用中所需的插入损耗、输出脉冲周期性与功率稳定性等性能要求,对多种光纤光脉冲复制结构的特点进行了分析比较。

The pulse sequences for achieving some logic operations of cycles and transpositions of quantum states have been devised.

本文的主要工作包括以下内容:●通过分析在核磁共振实验中实现基本通用量子逻辑门的脉冲系列,设计了实现对量子态进行各种轮换操作、对换操作的逻辑部件的脉冲系列,在实验中用这些脉冲系列实现了预先设计逻辑部件的逻辑功能。

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