二次场

用Wiener-Hopf法求得了二次场和反射系数，从而求得表面阻抗。

Using the Wiener-Hopf method , expressions of the secondary field and reflection coefficients are obtained , and Finally the expression of the surface reactance is found .

在求解域内存在磁性介质的静磁场问题时，将磁性介质视为二次场源是方便的。

It is convenient to consider the magnetic medium as a secondary field source in solving the magnetostatic problems .

以测量激发极化二次场时域谱为基础，研制开发出以单片微型计算机为中央处理单元（CPU）的新型激电仪。

On the basis of measuring V 2 time spectrum of induced polarization ( IP ), a new type of IP instrument has been developed , which has a CPU of single chip microcontroller .

由一次场电阻率曲线料率导出的K剖面法，引出了激电二次场各参数的导数，从而建立了激电参数微分曲线法。

The derivatives of various parameters in IP secondary field are derived from the K-section method of electrical exploration , which is derived from the slope of resistivity curve in primary field , and the IP differential parametric curve method is established .

直流激发极化法中的视电阻率参数及二次场采样

The apparent resistivity parameters in direct current IP method and the secondary electric field sampling

连续变脉宽发送激电方波与自动变周期测量二次场信号

Transmission of IP square wave with continuously varying pulse width and measurement of 2nd-Degree signal with automatic periodic variation

通过计算二次场来进行二维大地电磁数值模拟；

An efficient method has been presented which is named secondary field finite element method for two-dimentional magnetotelluric numerical modeling .

该方法基于目标体的电性差异，利用不接地回线或接地回线向地下发送一次脉冲磁场，在一次场的间歇期间，观测二次场。

It utilizes re-line untouched to ground or re-line touched to ground to transmit once pulse magnetic field toward the underground .

从自然场、一次场、二次场进行所有电极同步连续电压采集，一次采集同时完成多种装置测量。

Synchronous and continuous voltage sampling has been carried out within natural field , primary electrical field and secondary electrical field .

本文主要研究在载流线圈作用下，通过测量生物组织产生的二次场对线圈阻抗的改变，应用改进的遗传算法重构分层生物组织各层电导率和厚度的方法。

This thesis presents the application of improved Genetic algorithm to reconstruct the conductivity distribution of stratified biological tissue by measuring the change of impedance in the coil .

除了可以观测岩、矿石或标本包含感应效应和激电效应的二次场，还可以实现对视电阻率和视极化率的测量。

In addition to observing rocks , ores or specimens of the second field induction effect and polarization effect , but also realize the resistivity and polarizability measurements .

就理论基础而言，频率域电磁法和时间域电磁法是相同的，两者都是研究电磁感应二次场的。

Just theoretical basis is concerned , frequency domain electromagnetic method and the time domain electromagnetic method is the same , both are the research of electromagnetic induction secondary field .

2推导归纳总结了系统误差，偶然误差，一次场过渡过程，二次场过渡过程，斜阶跃影响改正的方法；

Deduce , induce , tally upped the correction method on the system error , accidental error , correction of primary field and second field , correction of ramp waveform effect ;

该方法适用于任何方向的磁偶极子源.将总场分离成背景场和二次场，使该方法适用于任何方向的磁偶极子源。

The separation of the total electric field into the background and the secondary fields makes it possible that the technique proposed in the paper is suitable for the magnetic dipole in any direction .

分析对比得出不同导电矿物含量与视电阻率、视极化率的定量关系，得出了二次场视极化率衰减规律与导电矿物含量为指数型函数关系。

Analysis and comparison the quantitative relationship obtained with the apparent resistivity and apparent polarizability of different conductive mineral content . Discussed the exponential function relationship between attenuation of apparent polarizability in secondary field and conductivity of mineral content .

瞬变电磁法（TEM），是利用不接地回线向地下发送一次脉冲瞬变磁场，再测定一次脉冲瞬变磁场引起的二次涡流场的方法。

Transient Electromagnetic Method ( TEM ) is a reconnoitre method by sending out a pulse transient magnetic field toward underground using the loop not connecting ground , and then measuring again quadric backsets that is caused by the change of the magnetic field .

旋转物质二次引力场中粒子的运动

Motion of particle in quadratic gravitational field caused by rotating body

平面二次向量场多项式首次积分的不存在性

Nonexistence of Polynomial First Integrals for Quadratic Planar Vector Systems

信号能量集中在低频早期阶段，并随着时间衰减很快，这反映了二次涡流场随渗透深度逐渐减弱。

Along with time axis the energy fast attenuate which show second field along depth weakening .

利用人工神经网格方法对高精度航磁资料的处理，可以寻找到这种二次磁化场。

Such secondary magnetized field can be discovered by interpreting accurate aeromagnetic data processed with neural network method .

同时还推导了两个目标的二次散射场之间的关系。

Meanwhile , the relation between the secondary scattering field from one target and the other is derived .

笔者认为，含油气沉积岩因长期油气的渗透作用而形成的磁异常是一种二次磁化场。

I believe that the magnetic anomaly due to long-period hydrocarbon seeping from hydrocarbon-bearing sedimentary formation is a secondary magnetized field .

该方法解决了发射模式下一次传输场和二次反射场的矢量叠加问题，计算精度高；

This algorithm solve the problem of vector superposition between the reflected field s and direct transferred field in transmission model with good accuracy .

双二次耦合场对铁磁/反铁磁双层膜中交换偏置场的影响直接置换法制备包覆型铁铜双金属粉末的工艺研究

Effect of Biquadratic Coupling on Exchange Bias of Ferromagnetic and Antiferromagnetic Bilayer Films Preparation of Fe / Cu Bimetallic Powders by Direct Substitution Reaction

结果表明：随着双线性耦合场或双二次耦合场的增加，交换偏置场的最大值位置向易轴靠近。

The results show that the maximum of the exchange bias field departs from easy axis with increasing the biquadratic-coupling field or bilinear field .

济钢第一炼铁厂通过在原料二次料场采用逐层自动变流量堆料技术，降低堆料粒度的偏析；

Ironmaking Plant of Jinan Steel adopted automatically variable flow stacking technology layer by layer in secondary blending yard for reducing the particle segregation of stacking ;

在背景场计算中，对地下均匀半空间和水平均匀层状模型的背景场对二次异常场的影响进行讨论。

Under calculating background , we research the uniformity half space and multi-layers models , discuss the effect on studied background results to abnormity and overlapping field .

采用物理光学方法计算电大目标散射场时，模型间的二次散射场需要单独考虑。

When PO ( Physical Optics ) method is used to calculate the scattered field of electrically large objects , the double reflection between two objects should be considered independently .

分析了站址环境对雷电定位系统中的方向探测仪的影响，定量估计了孤立障碍物产生的二次辐射场引起的定向误差的大小，分析了方向探测仪周围的输电线路对定向产生的误差。

In this paper , the effect of the site errors on the Lightning Direction Finder has been analyzed . The angular error produced by re-radiated field caused by isolated is estimated .

应用互易性原理使求解复合目标的二次散射场简化为求解包含平板上的极化电流和微粗糙面散射场的积分方程。

By employing the reciprocity theorem , the secondary scattered fields from the composite target can be simplified as the evaluation of integral equation involving polarization currents of the conducting plate and scattered fields from the slightly rough surface .