阻抗

The principle of determination of sound absorption coefficient of materials by transfer function method is introduced.

介绍了在阻抗管中采用传递函数法测量材料吸声系数的原理，详细介绍了使用双传声器进行测量的方法，指出了测试的频率范围取决于阻抗管的管径大小和传声器布置的位置。

D seismic and logging data of the first mining area in the Xinyi coal mine are dealt with impedance inversion to predict aquosity and watertightness of the top Ordovician limestone and the possible water-rich areas in the aquifer are determined by the impedance values.

本文根据新驿煤矿首采区的三维地震和测井资料，利用波阻抗反演技术预测该区奥陶系灰岩顶部的含隔水性，并依据波阻抗值的大小圈定含水层中的可能富水区。

The rules of the cold-test characteristics changing with helix pitch are also studied and it turns out that, with increasing helix pitch, the phase velocity increases linearly, the interaction impedance changes nonlinearly and the attenuation constant decreases nonlinearly. At the same time, with the limitation of the synchronism between the electron beam and the electromagnetic wave, the change of pitch is small and therefore an approximate linear relation can be introduced.

研究表明：相速几乎随螺距增大而线性变大，互作用阻抗与螺距是非线性的关系，衰减常数随螺距增大而非线性地减小；由于在维持电子注与电磁波速度同步的限制下，螺距变化的幅度不可能很大，因此可近似按线性关系来处理互作用阻抗及衰减常数与螺距之间的关系。

Starting from basic principle of electric field and theory of biodynamics, the author built a simulation model based on PSPICE platform; and conducted some initial studies on the formation of EIR waveform and on the source of its component parts by way of computerized simulated experiment in combination with laboratory facilitics of clinical human body...

文中从基本电场原理和生物动力学理论角度出发，建立一种基于 PSPICE平台的仿真模型。通过计算机的模拟实验，结合临床人体检测的实验手段，对肺血阻抗图的波形形成和成分来源作了一些研究。初步导出电极极板的面积和位置，其与检测所得的肺血阻抗图的相互关系。

Taking the development platform of HVDC power transmission for example, the calculation result of impedance-frequency characteristic of traditional line commutated converter and that of FCC are compared. Simulation results show that the impact of impedance-frequency characteristic of converter on the resonance frequency of AC system is not negligible, and FCC can enhance the strength of AC system in a certain extent, improve system stability and effectively reduce AC equivalent impedance under resonance frequency, thus the harmonic instability of HVDC power transmission system can be avoided.

以直流输电开发平台为例，对传统电网换相换流器(line commutated converter，LCC)与FCC的阻抗频率特性计算结果进行对比，仿真结果表明换流器的阻抗频率特性对交流系统的谐振频率有着不可忽略的作用，FCC在一定程度上提高了交流系统强度，改善了系统稳定性，有效降低了系统谐振频率下的交流等值阻抗，从而更好避免直流输电系统谐波不稳定现象的发生。

The repulsion is to be expected when the two parallel slabs have different electromagnetic properties. By studying different cases containing ordinary materials and metamaterials, we found that the repulsive behavior may possibly appear when the wave impedances, which are used to demonstrate the difference of electric and magnetic properties between two slabs, are smaller and larger than the impedance of vacuum, respectively, and moreover, the greater the difference between two wave impedances, the more easily the repulsive force is obtained.

排斥的Casimir作用力只可能出现在两不同平板的情况中，而通过考察正常材料与特异材料介质的不塑料托盘同组合情况，我们发现板间媒质阻抗的值介于两板的阻抗之间且两板阻抗比与板间媒质的差异越大，Casimir排斥力越容易产生。

Bandwidth depends on impedance ratio, and it is easy to realize high and low impedance in CPW by spacing the gaps and shunting more transmission lines.

频宽取决於阻抗的比值，共平面波导结构可以轻易的实现高阻抗和低阻抗，达到宽频的效果。

The scheme use quadrilateral directional impedance characteristics and R-L algorithm to calculate the impedance of the faulted phase. The results of simulation show that the performance of distance protection proposed is reliable, and can be used as backup protection for six-phase transmission line.

阻抗继电器采用四边形方向阻抗特性和R-L模型法进行故障相阻抗的测量，大量的仿真测试表明，该距离保护方案性能可靠，可以作为六相输电线路的后备保护。

A measure of the total opposition to current flow in an alternating current circuit,made up of two components,ohmic resistance and reactance,and usually represented in complex notation as Z=R+iX,where R is the ohmic resistance and X is the reactance.

全电阻在交流电路中电流所遇到的所有阻抗的度量单位，由欧姆电阻抗和电抗两部分组成，在复合的标记中通常表示为：Z＝R＋iX，其中R是电阻抗，X是电抗

A measure of the total opposition to current flow in an alternating current circuit, made up of two components, ohmic resistance and reactance, and usually represented in complex notation as Z = R + iX, where R is the ohmic resistance and X is the reactance.

全电阻：在交流电路中电流所遇到的所有阻抗的度量单位，由欧姆电阻抗和电抗两部分组成，在复合符号中通常表示为 Z = R + iX，其中 R 是电阻抗， X 是电抗

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。