1) dual-frequency complex impedance
双频率复阻抗
1.
Based on the three-element circuit model of blood,regarding the dual-frequency complex impedance information as the known quantity,a practical formula is deduced to obtain complete dynamic information of three-element.
根据血液的三元件阻抗模型 ,以双频率复阻抗信息为已知量 ,建立了全信息动态计算三元件的实用公式 。
2) complex impedance spectra
复阻抗频谱
1.
The main works include following three parts: First, measurement of bio-tissue complex impedance spectra; Second, the research on reconstruction algorithm electrical impedance tomography; Third, systematic research on real-time electrical impedance tomography.
由于生物组织复阻抗频谱与其生理、病理状态密切相关。
3) dual-frequency resistivity
双频电阻率
1.
Analyzed is feasibility to identify the fluid property with the following 3 methods:①dual-frequency resistivity method;②position cesium density-thermal neutron porosity method and ③GR-Σ method.
介绍了在四川广安地区应用EcoScope多功能随钻测井资料判别储层流体性质的方法,探讨了双频电阻率绝对值法、方位铯密度和热中子孔隙度重叠法、GR-Σ交会法3种新方法在水平井中判别流体性质的可行性。
4) impedance frequency model
阻抗频率模型
1.
After the impedance frequency models of electric elements including generators, transformers, filters and transmission lines are completed, by means of network impedance frequency scanning program (NIMSCAN) the harmonic impedance equivalent calculation for ±800 kV UHV.
在完善发电机、变压器、滤波器、线路等电气元件阻抗频率模型的基础上,采用NIMSCAN阻抗频率扫描程序对向家坝—上海±800kV特高压直流输电工程进行了谐波阻抗等值计算。
5) the frequence at the minimal impedance
最小阻抗频率
6) impedance-frequency characteristic
阻抗频率特性
1.
The determination of impedance-frequency characteristic of HVDC converter is important in avoiding system resonance.
高压直流(HVDC)换流器阻抗频率特性的确定对避免系统发生谐振具有重要意义。
2.
The impedance-frequency characteristic of converters in HVDC power transmission is an important factor in the analysis and solution of harmonic instability.
高压直流输电(HVDC)换流器的阻抗频率特性是分析和解决谐波不稳定的一个重要因素,滤波换相换流器(filter commutated converter,FCC)是一种具有阀侧谐波抑制兼无功功率补偿功能的换流器,文章简要论述了FCC的接线方案和工作机理,并基于开关函数法对计及换流器换相过程影响下的FCC交、直流等值阻抗计算式进行了理论推导。
3.
And from the simulation performed on this model, the impedance-frequency characteristics of three modes of AT power supply system are obtained as well as the accurate resonance frequency.
本文在MATLAB/SIMULINK提供的仿真平台上搭建模型并进行仿真分析,以京津城际铁路为例建立了牵引网的仿真模型,并通过仿真获得了不同模式AT供电方式牵引网的阻抗频率特性曲线,获得了准确的谐振频率。
补充资料：星接阻抗和三角接阻抗的变换
星接阻抗和三角接阻抗的变换
transformation between starc-onnected and delta-connected impedances
x ing]一e乙日kongl介e sonJ一00}Iez日伙ongde匕一。一〕huon星接阻抗和三角接阻抗的变换(t ransfor-mation betweenstar一eonneeted and delta-eonneeted imPedanees)接成星形的三个阻抗和接成三角形的三个阻抗互相替代的等效变换。它们之间的关系可用一组变换公式表示。按这组公式，用星接阻抗替换三角接阻抗或者反过来，不会影响稳态下电路其他部分的正弦电压和电流，常用于对称三相电路的分析和计算。 图1为三个阻抗21、Z:、23接成星形(又称丫形)。图2为三个阻抗Z小22。、Zal接成三角形(又称△形)。它们之间的变换公式如下:人23土图1星接阻抗图2三角接阻抗(1)将星形连接变换成三角形连接212一Z:+22+2 122及3一22+za十警(1)、|冬|矛231一23+21+2321(2)将三角形连接变换成星形连接z、-二一典乒兴-) 艺‘2士乙“3十乙31…_2 oqZI，}Z。一下万~一二-二二-汁 乙‘2士乙23十乙3‘1_Z。IZoq}艺q一二二一~二，二二--，-二二-~J 乙12十乙23十艺32夕(2) 当三个星接阻抗相等，即21一Z:一23一z丫、三个三角接阻抗相等即212一223一231一Z△时，变换公式是 Z二一32丫，Z丫一Z△/3
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条