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Firstly, oscilloscope control system based on GPIB technique is presented with friendly operation environment to the HIFU system, and it uses multithreading technique in programming to realize real-time recording and display of the signal; Secondly, temperature collection and data recording system is designed, which also could get real-time recording and display of the 16 channel temperature signal, and it's believed to be of great use for further experiments of the HIFU system; Thirdly, multiple ultrasonic phased array's phase shifter is designed,which could provide 8-bit phase control in a range of frequency where the centrical frequency is 1MHZ. Fourthly, the module of serial communication is realized to insure the communication between devices and computer, including both synchronous and asynchronous communication, which enables the system to transfer data reliably and stably; Finally, the module of digital quantity control is accomplished, which provide for upper application the consistent solution to the control of exterior devices via digital interface. It can get or set the devices state using interrupt mode to receive input signal or send output signal.

主要有以下几个方面：设计了基于GPIB的示波器控制系统，给课题的研究工作提供了一个良好的环境，它采用了多线程编程的方法，能够较好的实时显示当前波形并记录数据；设计了温度采集和数据记录系统，能够对16路温度信号进行并行同步的实时采集，用于HIFU剂量学研究中温度场检测和医疗评价；设计了相控阵相位延时电路并且通过调试，满足了课题的相位控制的要求，在中心频率为1MHZ左右的频率范围内都能够达到8-bit相位控制；实现了串口通讯模块，为各项设备与计算机之间的通讯提供保证，它提供同步和异步的通讯能力，使系统能够可靠稳定的传输数据；建立了数字量控制模块，为上层应用程序提供一致的方法使用数字接口控制外部仪器，它使用中断的方式来接收输入或输出设定的开关量信号，从而得到或设定各种仪器的状态。

The enhancement pattern of 6 liver metastasis was diverse,including peripheral or entire degree enhancement in the arterial or portal phase with slow or fast wash-out. The 6 cases of hemangioma were enhanced centripetally in portal phase and washed out after several minutes and the other 2 nodule cases with entire enhancement.

结果］14例原发肝癌中10例呈典型表现，为"快进快出"。6例肝转移癌表现多样，动脉期可呈环形或整体增强，肝恶性肿瘤的消退时间早于其他肝脏局灶性病变（P＜0.05），门脉期或延迟期表现为相对低回声。6例肝血管瘤有其特有征象动脉期开始缓慢向心性结节环形增，持续数分钟后才消退。

This feature gives a reasonable explanation for the mechanism of CAS. The phase velocity of diffraction fields for uniform plane wave on a circular aperture has been investigated. It is shown that diffraction can result in subluminous phase velocity at certain points of optical field in vacuum.

如果相对论电子能够注入到这一通道内，那么它与激光场间的相移就可能变得非常小，从而能够长时间地保持在加速相中得到极高能量。

The work described in this paper,by adopting a parameterized adaptive meshing image reconstruction method to yield the interface between the two layered phases, aims to improve the existing static mesh based ERT measurement accuracy for a stratified two phase flow within a closed pipe, assuming that the phase interface is of a distinctive nature or its fuzziness in the boundary region omittable.

电阻层析成像技术是一种非常有潜力的两相流/多相流检测技术，可实现对封闭管道或者过程容器设备内部多相组分物质参数的可视化测量，具有非侵入、响应速度快、成本低、安全性能好、适用范围广等优点，适用于两相流/多相流中以液相为连续相的生产过程。

Furthermore, NiAl precipitates coarsen in the Cr phase and dislocation appears in the Cr phase.

此外，Cr相中的NiAl微粒粗化，在Cr相中出现了位错线。

The results indicate that there are 8 stable conformers for D4G in gas phase. The conformer d4g-2 is the most stable form of all conformations in gas phase.

结果表明，孤立的D4G分子在气相中存在8种稳定构象，其中构象d4g-2是所有构象中最稳定的，气相中D4G主要以d4g-2存在。

By adopting relationship in frequency domain coherence analysis method is presented on the thesis for conventional fMRI and resting-state fMRI. Otherwise I use cross spectral density function in the coherence analysis method to discuss the phase delay and phase lead.

本篇论文采用同调性分析的方法探讨频率上相关性的方法研究一般功能性影像与平静状态功能性的影像并藉由同调性分析里交互频谱密度函数来研究信号之间相位差的问题。

By using this method, the angular frequency, amplitude, initial phase angle, decay constant of each component in transient voltage and/or current waveforms can be precisely extracted. Also, all other kinds of transient procedure can be analyzed by this method. Thirdly, a new definition of generalized instantaneous reactive power and generalized instantaneous reactive current in dq0 coordinates under any nonsinusoidal and unbalanced three-phase circuit is proposed for the first time. The detection and compensation method for different instantaneous reactive currents are also concerned.

本文首先提出了用于快速高精度频谱分析的一种改进快速傅立叶变换方法，该法具有速度快、精度高、抗混迭、不受采样定理约束、可以分析出谐次大于N／2的频谱系数等特点，可方便地应用于电力系统谐波分析及其它各类频谱分析；然后提出了基于非线性最小二乘优化法的电力系统暂态波形分析方法，可准确求出电力系统暂态电压、电流波形中各个分量的角频率、幅值、初相角及衰减常数，并可广泛应用于各类暂态过程波形分析。

In Chapter 6, the self-induced geometric phase of laser field when possessing cyclic attractors and the complex Berry's phase under the adiabatic evolution of backscattering coefficients when not, including the case of having noises, are considered in a two-mode ring laser with backscattering.

在第6章中讨论了具有后向散射的双模环形激光具有周期吸引子时的自诱导几何相和不具有周期吸引子时在后向散射系数绝热演化下的复Berry相。

As response signal of damped free vibration could be considered as product of the harmonic wave and the unilateral exponential function and the rectangle window, the peak frequency and phase are frequency and phase of the harmonic wave signal is proved in theory in this paper.

针对自由衰减振动信号的连续谱，将其看成无限长谐波信号与单边指数函数及矩形窗的乘积，在理论上证明峰值点的频率和相位就是信号的实际频率和相位。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。