波带

along with the development of digital technology,digital filters are widely used in many fields,this paper introduces how to design a iir digital notch filters in matlab environment.the design of digital notch filters can be achieved through three steps:firstly,the design of analog lowpass filter; secondly,it is analog lowpass to analog band stop filter conversion;at last,using the bilinear transformation make the analog notch filters change into digital notch filters.the paper also introduces how to design the transfer function of the digital notch filters using all the zeros and farthest points at the same time,it also introduces the program of the digital notch filters under butterworth analog lowpass prototype.

摘 要：随着数字技术的发展，数字滤波器在许多领域得到广泛的应用。研究一种在matlab语言环境下设计iir数字陷波滤波器的方法，在数字陷波滤波器设计过程中，先进行模拟低通滤波器的设计，然后进行模拟低通/模拟带阻滤波器转换，最后采用双线性变化法将模拟陷波滤波器转化成数字陷波滤波器。提出一种用所有零点和极点来表达数字陷波器传递函数的方法，同时给出以巴特沃斯模拟低通为原型设计数字陷波滤波器的程序。关键词：无限冲激响应；巴特沃斯滤波器；数字陷波滤波器；matlab；双线性变换

The contourlet transform used in the system was constructed by dual tree complex wavelet transform followed by critically subsampled directional filter banks, sub-bands energy and standard deviations were cascaded to form feature vectors, and the similarity metric was Canberra distance. The performance of retrieval system was compared including original contourlet transform, non-subsampled contourlet transform, semi-subsampled contourlet transform and CCT under the same system structure.

该系统采用的复数轮廓波变换由双树复小波变换级联临界下采样方向滤波器构成，特征向量采用子带系数的能量和标准偏差连接而成，以Canberra距离为相似度度量标准；比较了基于同样架构的基本轮廓波变换、无下采样轮廓波变换、半下采样轮廓波变换和CCT纹理检索系统的性能。

The contourlet transform used in the system was constructed by dual tree complex wavelet transform followed by critically subsampled directional filter banks, sub-bands energy and standard deviations were cascaded to form feature vectors, and the similarity metric was Canberra distance.

该系统采用的复数轮廓波变换由双树复小波变换级联临界下采样方向滤波器构成，特征向量采用子带系数的能量和标准偏差连接而成，以Canberra 距离为相似度度量标准；比较了基于同样架构的基本轮廓波变换、无下采样轮廓波变换、半下采样轮廓波变换和CCT 纹理检索系统的性能。

In chapter 3,we study the Zakharov-Kuznetsov-Modified Equal-Width equation by employing the extended Jacobi elliptic function expansion method and obtain some new solutions of Jacobi elliptic function type of the ZK-MEW equation.;Secondly,using sn-cn method,we study K(m,n,1) equation and obtained some new exact solutions when k=s=3,especially obtained abundand solitary solutions and trigonometric function solutions when m→0 and m→1;In chapter 4,Painleve singular analysis was applied to nonlinear PDE with variable coefficients.

第四章将Painleve奇性分析方法应用到带阻尼项的变系数Burgers方程中，并得到了该类Burgers方程具有Painleve性质的条件，给出了该类Burgers方程的Backlund变换，用所得Backlund变换得到了若干精确孤立波解，包括奇异孤立波解，这些解不等同于行波型孤立波解；用齐次平衡法得到了对数型DBM方程的Backlund变换，并获得了DBM方程的各种孤立波解，包括尖峰孤立波解和奇异尖峰孤立波解。

Day, he one when hunting in the forest,he caughtsight of artemis'' fair maidens,the seven pleiades .hewas so attracted by their beauty that he started chasing them.indespair the charming maidens prayed to artemis for help and were sent up by the goddess to the heavens as a constellation .later he fell in love with another maiden,merope by name,butrash and impatient,he took the maiden by force and enraged her father,king oenopion of chios.the king made him drunk and put out his eyes .following the sound of the cyclopes'' hammer,he went to hephaestus,who sent a guide to travel with him to the east,where the sun rose.exposing his eyeballs to the rays of the sun,he was restored to his eyesight.he became aconstant companion of artemis and followed the goddess in the chase with his dog sirius.apollo did not approve of this love, however.one day he dared his sister to shoot at a dark spot moving in the sea.little did she suspect that she was aiming herarrow at orion,for the dark spot turned out to be the head of orion swimming in the ocean.artemis was extremely sad.as she could not pull him back from the grasp of death she sent him up to the sky as a constellation,with his hunting dog sirius be sidehim.

他是海神波塞冬漂亮的儿子。一天，他在森林中打猎，看到了阿尔特弥斯的仙女们——七颗明星。他如此爱慕她们的美丽，便追赶她们。困境中，美貌的仙女们向阿尔特弥斯求救。结果女神将她们都送入天空充当星座。后来奥利安爱上了另一少女墨洛珀。他鲁莽急躁地施暴于她。这激怒了少女的父亲俄诺皮耳国王。国王把他灌醉后，挖出了他的眼睛。随着&独眼巨人&大锤的敲响，他来到火神赫斐斯托斯跟前。火神派向导带他去太阳升起的东方。将眼球暴露于阳光后，他就恢复了视力，成了女神阿尔特弥斯永久的伴侣，并带着他的猎狗天狼跟随女神打猎。阿波罗并不赞成他们之间这种恋情。一天，阿波罗怂恿阿尔特弥斯向海中一移动的黑点射箭。她根本没想到自己是将箭瞄准奥利安。当看清黑点竟是在游泳的恋人奥利安的头时，阿尔特弥斯悲痛万分。因她无力使他起死回生，只好将他送入天空作一星座。他的猎狗天狼则蹲在他的身旁。

Orion orion was a giant hunter.he was the beautiful son of poseidon.one day ,when hunting in the forest,he caughtsight of artemis'' fair maidens, the seven pleiades .hewas so attracted by their beauty that he started chasing them.indespair the charming maidens prayed to artemis for help and were sent up by the goddess to the heavens as a constellation .later he fell in love with another maiden ,merope by name,butrash and impatient, he took the maiden by force and enraged her father,king oenopion of chios.the king made him drunk and put out his eyes .following the sound of the cyclopes'' hammer,he went to hephaestus ,who sent a guide to travel with him to the east,where the sun rose.exposing his eyeballs to the rays of the sun ,he was restored to his eyesight.he became aconstant companion of artemis and followed the goddess in the chase with his dog sirius.apollo did not approve of this love,however.one day he dared his sister to shoot at a dark spot moving in the sea.little did she suspect that she was aiming herarrow at orion ,for the dark spot turned out to be the head of orion swimming in the ocean.artemis was extremely sad.as she could not pull him back from the grasp of death she sent him up to the sky as a constellation, with his hunting dog sirius be sidehim.

奥利安奥利安是位身材高大的猎手。他是海神波塞冬漂亮的儿子。一天，他在森林中打猎，看到了阿尔特弥斯的仙女们——七颗明星。他如此爱慕她们的美丽，便追赶她们。困境中，美貌的仙女们向阿尔特弥斯求救。结果女神将她们都送入天空充当星座。后来奥利安爱上了另一少女墨洛珀。他鲁莽急躁地施暴于她。这激怒了少女的父亲俄诺皮耳国王。国王把他灌醉后，挖出了他的眼睛。随着&独眼巨人&大锤的敲响，他来到火神赫斐斯托斯跟前。火神派向导带他去太阳升起的东方。将眼球暴露于阳光后，他就恢复了视力，成了女神阿尔特弥斯永久的伴侣，并带着他的猎狗天狼跟随女神打猎。阿波罗并不赞成他们之间这种恋情。一天，阿波罗怂恿阿尔特弥斯向海中一移动的黑点射箭。她根本没想到自己是将箭瞄准奥利安。当看清黑点竟是在游泳的恋人奥利安的头时，阿尔特弥斯悲痛万分。因她无力使他起死回生，只好将他送入天空作一星座。他的猎狗天狼则蹲在他的身旁。

Orion was a giant hunter.he was the beautiful son of poseidon.one day,when hunting in the forest,he caughtsight of artemis'' fair maidens,the seven pleiades .hewas so attracted by their beauty that he started chasing them.indespair the charming maidens prayed to artemis for help and were sent up by the goddess to the heavens as a constellation .later he fell in love with another maiden,merope by name,butrash and impatient,he took the maiden by force and enraged her father,king oenopion of chios.the king made him drunk and put out his eyes .following the sound of the cyclopes'' hammer,he went to hephaestus,who sent a guide to travel with him to the east,where the sun rose.exposing his eyeballs to the rays of the sun,he was restored to his eyesight.he became aconstant companion of artemis and followed the goddess in the chase with his dog sirius.apollo did not approve of this love,however.one day he dared his sister to shoot at a dark spot moving in the sea.little did she suspect that she was aiming herarrow at orion,for the dark spot turned out to be the head of orion swimming in the ocean.artemis was extremely sad.as she could not pull him back from the grasp of death she sent him up to the sky as a constellation,with his hunting dog sirius be sidehim.

奥利安是位身材高大的猎手。他是海神波塞冬漂亮的儿子。一天，他在森林中打猎，看到了阿尔特弥斯的仙女们——七颗明星。他如此爱慕她们的美丽，便追赶她们。困境中，美貌的仙女们向阿尔特弥斯求救。结果女神将她们都送入天空充当星座。后来奥利安爱上了另一少女墨洛珀。他鲁莽急躁地施暴于她。这激怒了少女的父亲俄诺皮耳国王。国王把他灌醉后，挖出了他的眼睛。随着&独眼巨人&大锤的敲响，他来到火神赫斐斯托斯跟前。火神派向导带他去太阳升起的东方。将眼球暴露于阳光后，他就恢复了视力，成了女神阿尔特弥斯永久的伴侣，并带着他的猎狗天狼跟随女神打猎。阿波罗并不赞成他们之间这种恋情。一天，阿波罗怂恿阿尔特弥斯向海中一移动的黑点射箭。她根本没想到自己是将箭瞄准奥利安。当看清黑点竟是在游泳的恋人奥利安的头时，阿尔特弥斯悲痛万分。因她无力使他起死回生，只好将他送入天空作一星座。他的猎狗天狼则蹲在他的身旁。

In chapter 6, composite wavelets is first put forward and used to design digital filter by the author, this filter based on composite wavelets has the flattest band pass performance.

从小波良好的带通滤波性能出发，首次提出组合小波的概念，并用于数字滤波器的设计，得到了具有最平坦通带特性的组合小波滤波器。

Under certain ratio of signal-to-noise and through the computer simulations and calculations, the performances in Mbius digital base band communication system of five often used modem function set, those are the even and odd symmetrical triangle wave, even and odd symmetrical square wave and saw-tooth wave and their inverse transforms, are simulated 10000 times, and the fluctuation ranges of the error rate P(subscript b are observed.

在一定信噪比的前提下，通过计算机仿真和编程计算，对Mbius数字基带通信系统中偶对称三角波、奇对称三角波、偶对称方波、奇对称方波和锯齿波这5种常用的调制解调函数族及其逆变换进行仿真1万次，观察错误概率P

Four-port network with partial height cylindrical objects in rectangular waveguide junctions (i.e., Four-port rectangular junctions), multiple-stepped rectangular waveguide bend and T-septum rectangular waveguide junction are modeled by full-wave mode matching method in order to quickly design the combline cross-coupled filter, corner waveguide diplexer, generalized chebysheve waveguide filters and diplexers with high efficiency in this paper.

本文将它运用于矩形波导接头中带通用圆柱杆的四口网络、多阶梯矩形波导弯头和T—septum矩形波导接头的全波建模，有助于快速高效设计梳状广义切比雪夫滤波器、拐弯波导双工器、广义切比雪夫波导滤波器和双工器。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。