极化

Polarimetric Synthetic Aperture Radar measures the frequency, magnitude, absolute and relative phase of targets' backscattering signals in imaging scene for any possible combination of transmit and receive antennas. The polarization synthesis technique on one hand has greatly increased the acquired polarization information, on the other hand increased the difficulty of system design and signal processing.

中文摘要极化合成孔径雷达的回波信号可以提供不同收发极化状态组合下成像场景内目标散射波的幅度、绝对和相对相位、频率等信息，极化合成技术的出现使获取的信息量成倍增加，信息量增加的同时系统设计和信号处理的复杂度增加，因此极化合成孔径雷达相关技术的研究成为微波遥感领域的热点。

This article first antenna, microstrip theory, the circular polarization technology, the theoretical discussion, in this based on the microstrip antenna of circular polarization method - corner square microstrip antenna, and has done a design simulation , and then do the design and further research to improve and eventually get a resonant frequency (S11 reflection coefficient corresponding to the minimum frequency) for the 1.5GHz and 1.43GHz, the frequency of circular polarization for the 1.46GHz, S11 is less than -10dB relative bandwidth, the VSWR is less than 2 is about 8.8% relative bandwidth, axial ratio less than 3dB relative bandwidth of about 2.2% of the right circular polarization microstrip antenna design case, which proved very good the circular polarization microstrip antenna theory, also fully confirmed by a square corner design is a practical program, and select the appropriate regulation of sticks is indeed able to improve the performance of the antenna.

本文先对天线、微带理论、圆极化技术等进行了理论论述，在此基础上，提出圆极化微带天线的实现方法——切角方形微带天线，并对此做了设计仿真，后又对这一设计方案做了改进及进一步研究，最终得到一个谐振频率（反射系数S11 的最小值所对应的频率）为1.5GHz和1.43GHz，圆极化频率为1.46GHz，S11 小于-10dB 的相对带宽、驻波比小于2 的相对带宽约为8.8%，轴比小于3dB 的相对带宽约为2.2%的右旋圆极化微带天线的设计案例，从而很好的印证了圆极化微带天线理论，也充分证实了切角方形是一种切实可行的设计方案，而选取合适的调节枝则确能提高天线的性能。

ABSTRACT The dissertation consists of the polarization theory and the scattering theory of polarization including the exact solution for the scattering of plane wave by a chiral elliptic cylinder and the polarization of scattered wave.

本文主要研究了极化理论及目标的极化散射特性，包括研究旋波媒质的电磁极化散射特性，首次给出了旋波媒质椭圆柱散射问题的精确解析解，同时对其散射的极化特性进行了分析。

In this paper, the transfer matrix of circular polarization phase shifter is derived through coupled wave theory, transfer characteristics of elliptically polarized wave, circularly polarized wave, linear polarized wave are considered.

根据铁氧体耦合波理论推导出圆极化移相器对任意极化电磁波的传输矩阵，在此基础上研究了椭圆极化波、线极化波、圆极化波在移相器内的传输特性。

Using DC and AC poling methods, three groups of polarized PZT/P 70/30composites have been prepared by poling only the ceramic phase(1), both ceramic and polymerphases in the same(2) and opposite(3) directions. Piezoelectric coefficients of group 1 compositesincrease as the PZT content increasing, while for group 2 composites, the piezoelectric coefficientschange the sign with increasing PZT content because piezoelectricity of copolymer is increasinglycompensated by that of PZT, and PZT content for zero-〓 isn't that for zero-〓. The experimentdata of both group 1 and 2 composites agree well with EMT-Shin model.

对复合材料的压电性能：只极化PZT粒子相的复合材料的压电系数随陶瓷分数的增大而增大，PZT粒子相与共聚物基体同向极化的复合材料的压电系数由于两相效应的部分抵消，随陶瓷含量的增大，发生符号的改变，且〓和〓零点不重合，它们与EMT-Shin模型都符合较好；而两相反向极化的复合材料的压电系数由于AC反向极化会导致陶瓷相极化程度的下降，导致实验值和理论预期偏差较大，尤其在PZT粒子高含量区。

On this base, eigen-polarization has been obtained and been used in describing the target polarization scattering characteristics. Polarization features insensible to target's posture have been extracted in accordance with the wideband dynamic distribution information of eigen-polarization in polarization state plane.

在散射矩阵对称性修正的基础上，利用本征极化理论求解了目标的本征极化，并利用它来作为目标极化散射特性的描述，根据它随观测频率在极化状态平面上的动态分布信息，提取了对目标姿态不敏感的极化特征。

In this paper,we present the fundamental the ory and the experimental principle of the optical electron polarimetry.

极化电子束在物理学及其相关领域应用十分广泛，要深入研究这些应用必须对电子束的极化度进行精确测量，通常测量电子束极化度的仪器有两种：Mott极化度测量仪和光学极化度测量仪。

One positive bipolaron can be slipt into two positive polaron, and one positive polaron can be split into one a negative polaron and the other a positive bipolaron—where this photoinduced carrier fission does not need the aid of an external electric field, which is a typical symmetry breaking.

一个正的双极化子裂变成两个正的单极化子，以及一个正单极化子可以裂变成一个正的双极化子和一个负的单极化子。光诱导的载流子裂变不需要一个外电场的帮助，是一个典型的对称性破缺。

The effects of processing parameters in thermal poling, such as applied poling voltage, poling duration and ambient temperature, on the linear electrooptic effect created in the optical fiber are investigated.

在线测试了热极化过程的一些参量，例如极化电压、极化时间、以及极化温度等对热极化光纤中产生的线性电光效应的影响。

Spin injection make the spin density of the polarons different at the different position in the organic semiconductor.

计算结果表明，极化子电导的自旋相关性是自旋注入引起的，和电流的自旋极化率密切相关；在自旋注入发生后，有机半导体内不同位置上极化子自旋态密度不同，由此产生的极化子电导也不相同，极化子电导是位置的函数。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。