查询词典 impedance drop

This is called an impedance discontinuity or an impedance mismatch.

这被称为阻抗不连续或阻抗不匹配。

In this paper, a new medical impedance imaging modality (Magnetic resonance electrical impedance tomography-MREIT) is first introduced, including its mathematical theories and the reconstruction algorithms. Then its application in early breast cancer detection research is introduced in detail. Finally, its future research direction and major problems are summarized.

本文在此前提下介绍了一种高分辨率的医学电阻抗成像技术－磁共振电阻抗成像技术的成像原理与成像算法，然后介绍了MREIT技术在早期乳腺癌检测方向的应用，最后分析了该研究方向的发展前景以及目前存在的问题。

Magnetic Resonance Electrical Impedance Tomography is a new, noninvasive conductivity imaging modality that integrates current density imaging and traditional electrical impedance tomography.

基于磁共振成像系统的生物电阻抗成像技术是近几年发展起来的新型非入侵式成像技术。

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。

Objective To develop a new Two-step magnetic resonance electrical impedance tomography algorithm based on radial basic function neural network for imaging electrical impedance distribution of a head.

目的基于径向基函数（radial basic function，RBF）神经网络的两步核磁共振电阻抗成像（magnetic resonance electrical impedance tomography，MREIT）算法，对人体头部进行MREIT。

YAN Dandan,ZHANG Xiaotong,ZHU Shanan,Bin HeAbstract: Objective To develop a new Twostep magnetic resonance electrical impedance tomography algorithm based on radial basic function neural network for imaging electrical impedance distribution of a head.

目的 基于径向基函数(radial basic function，RBF)神经网络的两步核磁共振电阻抗成像(magnetic resonance electrical impedance tomography，MREIT)算法，对人体头部进行MREIT。

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。

In the procedure of computing impedance matrix elements, an improved method of accurate evaluation of retarded time integrals with singularity in self-impedance elements in MOT scheme is presented, which improve the late-time stability of MOT scheme.

在阻抗矩阵元素计算中，研究了一种基于Duffy变换的包含时间迟滞项的奇异积分的精确计算方法，提高了计算精度，改善了MOT求解积分方程中的晚时不稳定性。

The rule that the distribution contrast of the inner impedance of the battery unit changed with discharge depth is described with the family curves of the inner impedance.

使用内阻曲线族描述了电池组内阻分布的反差随放电深度变化的规律，得出在50%标称容量处达到最大反差的结论。

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。

More direct, directer ; most direct, directest

径直的，笔直的

Do you know how to use a chain saw?

你知道如何使用链锯吗？