角枝

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。

The change of cladoceran composition and abundance were extremely strong.

浮游动物的种类、数量的变化较之浮游植物更明显，尤其是枝角类的变化更大。

The cladoceran communities of the Three Gorges Reservoir showed distinct patterns in both longitudinal distribution and seasonal variation.

结果显示三峡水库的枝角类具有明显的纵向分布和季节变化特征。

Several significant changes were found in the composition of the rotifer, cladoceran and copepod assemblages.

许多重要的变化被发现在轮虫，枝角类和桡足类群体的组成中。

Community variability was consistently high at the end of each month-long experimental period for both cladoceran and rotifer assemblages, except under two conditions.

群体的可变性一直持续较高的在枝角类和桡足类每月长期试验的末期，除了在两个条件下以外。

Most cladoceran abundances showed sharp declines in the presence of fish, while some rotifers, as well as their assemblage species richness, responded favourably to fish.

大多数枝角类丰度显示骤然下降当鱼类出现，然而一些轮虫，它们的群体种丰富，反映出有利的机制。

Method\ Percolation of multiple-hole horizontal well is exchanged to radial percolation by applying conformal transformation theory and local percolation restriction .

应用保角变换原理和局部渗流阻力的概念，将多分枝水平井渗流问题转变为平面径向渗流问题，从而简化了求解过程。

Evergreen shrubs or small trees, scandent; branches and twigs brown or dark brown, obscurely angled when young.

常绿的灌木或小乔木，攀缘；枝和小枝棕色的或暗褐色，幼时具不明显角。

Stems and branches terete, sulcate or angular, glabrous or young shoot and inflorescence pubescent.

茎和分枝圆柱状，具槽的或具角，或幼枝和花序短柔毛。

The growth functions of the plant root systems were used to control the increase of the length of internodes and branching axis and the increase of the branching angles.

生长函数用于控制内节点的长度、分枝根的长度和分枝角的增加。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。