阻抗

The basic concept and modeling of PDS are firstly narrated, then the method of calculating target impedance of a circuit PDS is introduced. At last a simulating and analyzing method using SPECCTRA Quest PI is put forward to verify the PDS.

结合PDS在不同频率时存在不同的输入阻抗，介绍了如何计算电源分配系统目标阻抗的方法，通过SPEC-CTRA Quest Power Integrity软件对电路的电源分配系统目标阻抗进行了仿真与分析。

Intruduce impedance cardiography and describe its theoretical background, measuring methods, generation of impedance signals and its clinical meaning,and application of the impedance cardiography.

介绍心阻抗法的工作原理、测量方法、阻抗微分波的产生和临床意义，以及心阻抗法的临床用途。

The electrochemical impedance spectroscopy features and the resistance to corrosion of an epoxy coating containing the pigment of zinc chrome yellow have been studied with the aid of EIS and Fourier transform infrared spectroscopy analysis.

运用电化学阻抗谱和Fourier变换红外光谱研究了经过不同老化温度和老化时间处理的含锌铬黄防锈颜料的环氧酯漆在3.5％NaCl溶液中的阻抗谱特征，根据Fourier变换红外光谱和电化学阻抗谱中第二个时间常数出现的快慢及高频收缩情况来判断涂层的耐蚀性能，进而筛选老化工艺。

A new conception of power per unit impedance is defined and the basic equation to express the variation of load voltage magnitude with the variation of its dynamic equivalent impedance and that of power per unit impedance is derived.

定义了单位阻抗功率的新概念，推导了电压幅值随其等值阻抗和单位阻抗功率变化而变化的基本方程式。

an equivalent model of Al electrolytic capacitor has been studied in this paper. The change law of the equivalent serial capacitance, dissipation factor and impedance of Al electrolytic capacitor has been discussed at different frequencies with Agilent4395A Impedance Analyzer.

研究了铝电解电容器的等效模型，讨论了铝电解电容器在不同频率下，其等效串联电容、介质损耗因子、阻抗随频率变化特性，采用Agilent4395A阻抗分析仪测量了铝电解电容器参数、阻抗-频率特性等。

Numerical dispersion characteristic and impedance relationship of three dimensional perfectly matched layers are analyzed under finite difference approximation in this paper, respectively, which show that numerical dispersion relationship of PML is different from that of the FDTD equations and the impedance of homogeneous PML medium is the same as that of free space.

本文分别分析了有限差分近似下三维理想匹配层的数值色散特性和阻抗关系，分析表明，理想匹配层的数值色散关系有别于时域有限差分方程的数值色散关系；有限差分近似下，均匀理想匹配层媒质的阻抗和自由空间的阻抗相同。

Different biases can result in the opposite phase shifts of the impedance with respect to the applied signal. Neutral gas pressure affects the magnitude of the impedance, but does not change the shape of the frequency response curve. In addition, the position of the grid inside the vacuum chamber has little effect on the impedance.

结果显示栅网上的直流偏压对阻抗的影响很大，不同偏压可以使阻抗的频率响应反位相，气压对阻抗的大小有明显影响，但一般不改变频率响应曲线的形状，栅网的位置对阻抗几乎无影响。

The design for impedance converting circuit of input current,transistor amplifying circuit and converting circuit of output current is presented.The telegrapher equations are adopted to determine the impedance of transmission-line transformer,which is used to convert circuit impedance between signal source and transistor.

讨论了放大器输入回路阻抗变换电路、晶体管放大电路以及输出回路阻抗变换电路的设计思想，运用电报方程从理论上推导出用于信号源和晶体管之间阻抗变换的传输线变压器输入输出阻抗计算公式，由此设计出模拟信号处理电路中非常重要的AB类高功率放大器。

Geophysical characteristics of Ordovician carbonate rock were studied using drilling data. Impedance is affected mostly by material properties and reservoirs types, to a negligibly extent by lithology and flow. Compact layers and minor\|fracture reservoirs of Ordovician carbonate rock have characteristics of high density, high velocity and high impedance, and the prediction of minor fractures reservoir is difficult by the general seismic ways. Big fractures and fractured\|vuggy and vuggy and cavity reservoirs of Ordovician carbonate rock have characteristics of minor density and low velocity and low impedance in central Tarim basin, which obviously different from the surrounding rock and produce obvious characteristics in seismic data, so reservoirs can be predicted by applying general seismic data.

根据已钻井资料，对塔中地区上奥陶统良里塔格组岩石地球物理特征进行了研究，结果表明：物性、储层类型对波阻抗影响最大，岩性、流体对波阻抗影响较小；奥陶系碳酸盐岩致密层和小裂缝型储层具有密度大、速度高、波阻抗值大的特点，利用地震常规预测手段较难预测出小裂缝型储层，而塔中地区奥陶系碳酸盐岩大裂缝型、裂缝-孔洞型、孔洞型、洞穴型储层具有密度小、速度低、波阻抗值小的特点，与围岩具有较为明显的差异，在地震上可以产生明显的响应，可利用常规地震资料来预测这种类型储层。

The results showed that the impedances of composite electrodes continuously increased with increasing of immersion time.

结果表明，随浸泡时间的延长，复合电极体系的阻抗不断增大；在浸泡初期，复合电极体系的阻抗谱中即出现了低频扩散阻抗，认为该阻抗由金属表面钝化膜的溶解产物的传质引起。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。