Results the doppler spectrum of the combined motion of the chamber and the fluid was the vector sum of their doppler signals . conclusion cardiac motion alters the doppler signal derived from blood flow and this effect should be considered in the doppler flow velocity measurement 结论通常所谓的血流速度频谱实际上是血细胞在心脏内流动速度和心脏运动速度的矢量和，即两项运动的复合频谱，所以，为减少误差，在用多普勒血流速度频谱测定血流参数时，应考虑校正问题。
Electrical resistance tomography ( ert ) technique , which is based on resistance sensor principle , has the advantages of low - cost , non - intrusive , fast - responding . as a novel measurement technique , ert can play an important role in the on - line parameter measurement of the two - phase flow system 电阻层析成像( electricalresistancetomography ，简称ert )技术是一种基于电阻传感机理的过程层析成像技术，具有成本低、非侵入和响应速度快等优点，是一种可实现两相流参数在线检测的高新技术。
Particle simulation method is used to investigate the properties of the rco - tat , including the basic physical process of the beam - wave interactions and the dependence of the microwave radiation on the structure parameters , the beam parameters , and the guiding magnetic field intensity and distribution 利用21 / 2维电磁模相对论pic粒子模拟程序研究了rco - tat工作的基本物理过程，并研究了器件的结构参数、束流参数、导引磁场强度和分布对束波作用和微波输出的影响。
To measure the parameters of gas / solid two - phase flow has a very vital significance in the industrial production and scientific research . electrostatic sensor combining with the relevant signal processing technology provides effective solution to realize the on - line measurement on the mass flow rate of the solid paniculate , so it has high research and development value 气固两相流参数测量在工业生产和科学研究中具有重要的意义，静电传感器结合相应的信号处理技术为实现固体颗粒的在线质量流量测量提供了有效的解决办法，具有很高的研究与应用价值。
While analyzing the present flow imaging technique , this paper analyzes and sums up the features of multiphase flow , sort and parameter . it also analyzes the present status and the history of multiphase flow measurement . it points out the important meaning of multiphase flow measurement to the science and industry production , and sums up the research direction and developing trend of the future multiphase flow measurement 在分析现有流动层析成像技术基础上，对多相流特点、分类及参数进行了分析和归纳，分析了多相流参数检测技术的发展历史和现状，指出了多相流参数测量对于科研及工业生产的重要意义，对未来多相流参数测量的研究方向及发展趋势进行了分析和总结。
The numerical simulation was made on this kind of energy dissipator by using the k - s turbulence model , the full - field distribution of the time - averaged parameter and the turbulence parameter are described in detail , the calculated time - averaged pressure has good agreement with the experimental results , some advice can be provided for the further study and application in this thesis , especially the calculated results can be used to check the lowest time - averaged pressure 本文对洞塞式消能工采用轴对称的k -模型进行了数值模拟，数值模拟结果详细地描述了时均流参数和紊动参数的全场分布，计算所得的壁面时均压力结果与实验结果相吻合，获得了实体试验难以获得的流动特征。可供这种消能工的进一步研究和应用提供参考，特别是可用于检验压力最低点的大小。
According to the particle simulation , the amplitude of the beam current has a great influence on the microwave output , which is testified by our experiments . therefore , it is believed that higher beam current and input beam power will raise the output microwave power of the present device to a gw level 在我们实验的束流参数下，束流稍微变大，会引起微波功率较大的增加，因此如果能够提高束流的大小和适当提高束流电压，在目前微波器件基础上可以输出gw功率的微波。
After redistributing its surface , three - dimensional body - fitted grid is generated by solving elliptic partial differential equations , namely elliptic grid generation . the program of computing n - s equation is used to get the desiring results of varieties of attack angles and velocities . it is concluded that the results accord with the aerodynamics rules , so the computing results will instruct the experiment to some degree 采用求解三维n - s方程的计算程序，计算了不同来流马赫数下和不同攻角下的布撒器的流场，并分析了来流参数对计算结果的影响，分析结果表明计算所得的结果符合空气动力学的基本规律，计算结果对实验具有重要的指导意义。
Measuring of lightning parameters is the base work of lightning research . it is very important for researching the lightning characteristics , analyzing the accident of lightning , identifying the responsibility of lightning strike outage accident and discussing the strategies of lightning protection . it also can provide precise original data of atmosphere over - voltage for designing insulation co - ordination 雷电流参数的测量是进行雷电研究的基础工作，对于研究雷电特性、分析雷害事故、鉴定雷击跳闸事故责任、探讨防雷对策及为绝缘配合设计提供精确的大气过电压原始数据均具有十分重要的意义。
So the measure technology of gas - solid two - phase flow yet belongs to the research field urgently waiting for developing based on the research achievements obtained by our task team recently , this dissertation further employed information process technology into parameter measurement of gas - solid two - phase flow , where the neural network technology was used to recognize the flow regime and the data fusion technology to measure the flow velocity of solid - phase particles , and the simulation research was worked 因此，气固两相流检测技术尚属一个急待发展的研究领域。本文在课题研究小组近年来取得的研究成果基础上，进一步将信息处理技术引用到气固两相流参数检测中。文中主要应用神经网络和数据融合这两种方法分别进行气固两相流流型的辨识及固相颗粒流速的检测，并进行了仿真研究。
