导波

The multipath effect is an avoidless problem which the tracking radar and the searching radar among CIWS has to face. This paper analyses the form of the multipath effect on geometry, emphasizes the distance difference between the direct wave and the reflected wave, according to this inherent characteristic, the paper introduces the theory of HRR to the design of radars among CIWS, discusses the spike pulse technology and ultra wide hand technology which often be used, finally proposes the method of time-frequency code to obtain the high range resolution and avoid the multipath effect.

多路径效应是近程反导武器系统中的搜索雷达和跟踪雷达均无法避免的问题，文中分析了多路径效应形成的几何原理，并根据多路径效应中的直射波与反射波具有路程差的固有特性，将高距离分辨率雷达信号理论引入到近程反导武器系统的雷达中，讨论了实现高距离分辨率的窄脉冲和超宽带技术，最后提出了目前较易实现的时间－频率码合成高距离分辨率的办法。

According as the four modes in a symmetric waveguide, that one of modes is symmetric or anti-symmetric about X axes or Y axes, are X polarized or Y polarized odd mode or even mode, we calculated the polarized coupling characteristics using Cassinian curves as boundaries of the couplers.

本文还根据对称波导中对称于或反对称于x轴或y轴的四个模式分别为x偏振或y偏振的奇模或偶模的原理，用Cassinian曲线表示耦合器介质波导的边界，计算了耦合器的偏振耦合特性。

This paper analyses the coupling wastage in columniform wave guide gas laser,and gives the function between the coupling wastage of laser guide modulo EH11 and the position and radius of reflector.

分析了圆柱形波导气体激光器中的耦合损耗，给出了最低阶波导模EH11的耦合损耗与反射镜位置、曲率半径的函数关系。研究表明：反射镜的位置和半径存在着最佳值，在取得最佳值时，可得到最低的耦合损耗

By the proposed method, the exact calculation of the 3-D complexly structured waveguide EM fields is realized.

该方法克服了目前的有关数值分析方法在处理三维复杂结构波导边值问题所遇到的主要困难，实现了三维复杂结构波导边值问题的精确而有效的数值计算。

The method of ultrasonic broaching waveguide entocoele mentioned in th e article is the impulse machining method, in the broaching process the broachin g tool is thrown over the vertical ultrasonic vibration to obviously improve wor king accuracy and surface quality of waveguide entocoele.

本文提出的波导内腔超声推挤方法是一种脉冲加工方法，其实质是在推挤工作过程中，给推刀施加纵向超声频振动，以大幅度提高波导内腔加工精度和加工表面质量。

For high quality voice transformation, a novel parameter extraction scheme for glottal flow derivative is proposed based on Legendre orthogonal decomposition.

提出了一种用于源-目标说话人声门波导数参数转换的、基于勒让德正交分解的声门波导数波形参数提取方法。

Coupling between nonparallel waveguides is studied by coupling mode theory, and the coupling equations and coupling coefficients are obtained.

利用耦合模理论对非平行波导耦合特性进行了研究，得到了非平行波导的普遍性耦合方程及耦合系数表达式。

The shortcoming of ordinary multimode Y branch optical power splitter is that the branch characteristic strongly depends on the excited modal distribution. Different input conditions including different input modes and different input positions will excite different modes and different intensity distribution of these modes in highly multimode waveguides. The interference of these modes will contribute to distribute unstably, i.e.

多模Y分支器件的设计中存在一个共同的问题，即随着光入射条件的不同(包括入射光的模式不同和输入进波导端面位置不同等)，多模波导中所激励起的模的数目以及各个模之间的功率分配也各不相同，激励起的多个模式之间总是存在着不同程度上的相互干涉影响，从而最终影响功分器的分束均匀性。

Narrow waveguide after input section can effectively filter out the high modes which cause the ununiformity of Y-branches and has little influence on the length and excess loss of the device.

在输入波导后添加一段起模式过滤作用的窄波导结构，可以在对器件长度及损耗影响很小的情况下，有效滤除高阶模，减小干涉效应，改善器件输出的均匀性。

Aiming at the structure and refractive-index profile of wide-angle cross waveguide, the optical field distribution has been calculated by the method.

数值计算对交叉波导的设计和优化有着重要的意义，而选择正确的计算方法是交叉波导数值计算的关键。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。