阻抗

In Chapter 2, resonance properties of stepped-impedance resonator are analyzed with transmission line theory. Resonance conditions and electrical lengthes of two-section and tri-section stepped-impedance resonators are mainly analyzed, which provide the theory foundation for filter design.

第二章运用传输线理论分析了阶梯阻抗谐振器的谐振特性，主要分析了两个截面和三个截面阶梯阻抗谐振器的谐振条件和电长度，为滤波器的设计提供了理论依据。

The present magnetic resonance electrical impedance tomography method can only be used in MRI systems in which the main magnetic fields are parallel to the horizontal plane. In this paper, a new MREIT method with currents injected from an oblique plane is proposed. It can be used on MRI scanners with either permanent magnet or superconductive magnet.

现有的磁共振电阻抗成像方法只适用于主磁场平行水平面的磁共振系统，本文中提出了一种新的MREIT方法即斜位电流注入磁共振电阻抗成像，同时适用于主磁场垂直于水平面的磁共振系统。

In this paper, a reconstruction method of Electrical Impedance Tomography which based on the method of equipotential back-projection is analyzed in detail.

本文分析了一种基于等位线反投影算法的电阻抗成像方法，并用虚拟仪器LabVIEW软件构建一个虚拟平台，实现了电阻抗成像的图像重建。

A new simple passive load-matching scheme based on a patent is proposed, which makes inverter to match load in wide range of equivalent resistance.

在一项专利技术的基础上，提出了系统、详尽的无源负载匹配方案，使串、并联逆变器能够适应逆变器输出阻抗的多种变化，负载阻抗的匹配变得更为简便。

Therefore, high efficiency can be achieved. The circuit parameters are decided according to the intrinsic impedance of the resonant tank. As the duty ratios of the active switches are fixed, the charging current should be programmed via tuning the circuit operation frequency and therefore the circuit impedance. The optimum operating point is sieved by the frequency response diagram to operate the charger at high efficiency.

至於并联负载电路参数的设计是以共振槽的特性阻抗为基准，调变切换频率并固定主动开关的责任周期，藉由频率的变化改变电路阻抗，以控制充电电流的大小，透过频率响应立体图，挑选适当的操作点，使共振式充电器运作於最佳状态，以获得高效率。

RCS of facetsof targets coated RAM was resolved by combining Impedance Boundary Condition and Geometric Optics and RCS of those edges were approximated by computing the RCS of edges of impedance wedge through Method of Equivalent Currents.

其中，涂覆目标面元的散射场是通过结合阻抗边界条件和几何光学法而得到；而涂覆目标棱边的散射场则是通过等效电磁流法求解阻抗劈的边缘绕射场近似得到的。

RCS of facets of targets coated RAM was resolved by combining Impedance Boundary Condition and Geometric Optics and RCS of those edges were approximated by computing the RCS of edges of impedance wedge through Method of Equivalent Currents.

其中，涂覆目标面元的散射场是通过结合阻抗边界条件和几何光学法而得到；而涂覆目标棱边的散射场则是通过等效电磁流法求解阻抗劈的边缘绕射场近似得到的。

By adding an equivalent harmonic impedance in the branch circuit of power grid, this HAPF could force all the harmonic currents flow into passive power filters, which resulting in eliminating harmonic contamination more effective. And using the capacitive feature of PPF in the fundamental frequency, this HAPF could compensate fixed-capacity reactive power without increasing APF's burden. Moreover, in order to decrease APF's cost, the fundamental voltage will largely be endured by capacitor in view of the series resonance circuit tuned at the fundamental frequency, so the APF just bears little harmonic voltages.

其基本工作原理是：有源部分等效于在电网支路中串联了一个谐波阻抗，该谐波阻抗对基波电流不起作用，而对谐波电流产生很大阻碍作用，迫使谐波电流流入无源滤波器，从而达到滤除谐波的目的；同时新型注入式混合有源滤波器还充分利用了无源滤波器的无功补偿功能，在不增加有源部分容量的前提下，可以提供一定容量的无功功率；由于有源部分承受的电网基波电压不大，也没有基波电流流入，因此逆变器容量小，初期投资较小。

In the measurement system of partial discharge whose the point of grounding is single, the effect of the interference from ground wire on the degree of accuracy was investigated.

在第四章、第六章组成的第三部分当中，从抗干扰的方面入手，作者从灵敏度分析和抗干扰性能两方面分析了不同检测阻抗的检测效果，为正确选择检测阻抗提供了参考依据。

The material of guard ring has little influence on the additional thrust acting on the outer area of flyer.

保护环阻抗与飞片阻抗相差越大，飞片边部超前程度越大。

He is the most remarkable man that I have ever known.

他是我知道的人中最值得注意的人。

Increased appearance of lymphocele was noticed in patients with diabetic nephropathy, congenital malformations of the urinary tract, and inflammatory diseases, including glomerulopathy and extraglomerular ones, after high-voltage radiotherapy and after removal of the renal graft.

经过高压放射疗法和切除移植肾后，在糖尿病肾病患者、泌尿系统先天性畸形患者和炎症患者身上发现淋巴囊肿有所增加，包括肾小球病和球外疾病等。