极化

The new antenna has the advantages of sim ple structure, easy feeding and a wide frequency range, and circular polarized wave. The characteristics are m uch better than a bifilarbackfire helicalantenna, a shortbackfire antenna and a backfire...

它具有结构简单、馈电方便、遮挡小、频带宽、增益高且易于产生圆极化波等优点，性能远优于带相同接地板的螺旋天线、普通短背射天线以及单线背射螺旋作馈源的短背射天线。

Circular polarization is one of microwave equipment with broad application.its the mostly function is switch linearly - polarized wave into circular polarized wave.grating- circular polarization is one of circular polarization,its advantage is simple structure and ease of processing.it is prone to expand high power and high efficiency range.because circular polarization have expand application..

光栅圆极化器是其中的一种，它具有结构简单，加工实现容易，易于向高频率、高功率应用扩展等优点。

High-frequency have a polarization angle of the head scale value, west counterclockwise rotation, east clockwise rotation.

高频头上都有极化角的刻度值，往西逆时针旋转，往东顺时针旋转。

Adsorption and seepage characteristics of coal to methane under electric field have been studied.

地电场的存在已经是公认的事实，在地表岩石圈中的地电场包括大地电场、自然电场和极化电场，在矿山开采中还包括工业游散电场。

Because of the lower coercive force and high damage threshold, the crystal is chosen and designed for six period patterns.

由于周期极化掺杂氧化镁的铌酸锂晶体具有较低矫顽场和更高损伤阈值的优点，所以选择了该晶体并在其上设计了6个周期图案。

In view of China's current national conditions and the coerciveness of rural land system efficiency,'extremely expanded land management right' should be chosen as the reforming scheme.

鉴于中国的现实国情和农地制度变革效能的强制性，应该以"极化土地经营权"作为土地制度变革的类型选择。

Based on scattering signal model, the estimation algorithm is obtained, and effect of doppler frequency compensation error on measurement result is analyzed.

在建立回波信号模型基础上，给出了极化散射矩阵估计算法，并分析了多普勒频移补偿误差对测量结果的影响。

The newly developed airborne Imaging Wind and Rain Airborne Profiler, built by the Microwave Remote Sensing Laboratory at University of Massachusetts, is a dual polarized dual frequency conically scanning Doppler profiling radar.

三维风雨微波成像仪是美国麻省大学微波遥感实验室研制的双频、全极化圆锥式扫描多普勒雷达，能够同时以四种不同的入射角（30， 35， 40， 50°），15-150m的径向分辨率测量海面和气－海边缘层降雨单元的微波后向散射强度和多普勒频移。

The key components in laser gyro is He-Ne ring laser, and the reciprocal action theory between light and medium is the base in studying the ring laser, use the Lamb half classical theory, and on the base of density matrix theory, the optical Brounch equation was established, which described the movement of amplifying medium atom in the ring syntonic cavity, and according to the medium polarize theory the self consistent equations was deduced, which describe the light intensity and phasic of the counter-propagating wave. On the basis of this equations, adopted the simulation software MATLAB and virtual instrument programming language LabWindows/CVI, we can do some simulated experiments in study the phenomenas such as amplify and dispersive characteristic of medium, mode pushing effection, burned hole effection and pattern competition, lock-in of frequency and the characteristic of light intensity and phasic of the counter-propagating wave in laser gyro.

激光陀螺的核心部件为He-Ne环形激光器，而掌握光与介质的相互作用理论是研究激光器的关键，采用拉姆半经典理论为主，在密度矩阵理论的基础上，推导环形谐振腔中描述He-Ne气体增益介质原子运动的光学布洛赫方程，运用介质极化理论得出描述激光陀螺反向行波的光强、位相所满足的自洽场方程组，在此基础上，运用MATLAB仿真软件和虚拟仪器编程语言LabWindows/CVI，对激光陀螺中的介质增益色散特性、频率牵引效应、烧孔效应及模竞争、闭锁效应及环激光的光强和相位特性进行仿真试验研究，并且运用全量子理论，对激光工作原理进行分析，得出二能级系统单模辐射场的光子数密度分布，得出激光场的光子统计分布，仿真激光场的动态建立过程。

This paper described the main characteristics of these consortia, summarized some experiences from their management practice so as to provide some revelation for agricultural res...

本文描述了这些区域联合体的组织和结构，探讨了菲律宾国家农业研究系统在农业研究分极化管理方面的经验，期望能给我国的农业研究管理者提供一些借鉴或政策启示。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。