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This problem is also important and valuable in Nonlinear Optics. It will be very helpful to understand how the aberrations affect the course of three- wave mixing, such as the change of conversion efficiency, the distribution of intensity and phase.Small signal solution of aberrated second harmonic generation is deduced from three-dimension three wave coupling functions. The numerical work gives out lot of results of different aberrations. The effects of the fundamental waves aberrations, which will change the conversion efficiency, distribution of intensity and phase in the frequency conversion, is analyzed. It shows that when walk-off and diffraction effects could be ignored approximately estimation of the phase distribution of second-harmonic wave could be done. The far field divergent angle and second moment radius of harmonic wave will vary with the aberration of fundamental wave, but the far field divergent angle will be obviously smaller than that of fundamental wave. The phase distribution of both fundamental and harmonic wave is measured using Hartmann-Shack wave front sensor in the experiment with 1064nm and 790nm lasers, respectively. Results are given.

首次从三维三波相互作用方程组推导得到了位相畸变光束倍频的小信号解；通过建立国防科学技术人学研究生院学位论文三维数值模型，编写相应仿真程序，首次得到了位相畸变光束倍频过程的大量计算结果，深入细致地研究了位相畸变光束经非线性光学频率变换后谐波的转换效率、光强分布、位相分布以及影响它们的各种因素；得出谐波的远场发散角和光斑二阶矩的变化规律会因为基波像差的不同而不同，但谐波的远场发散角明显地比相应基波的小的结论；得到了在走离效应和衍射效应等影响许多因素可以忽略的情况下，位相畸变传递到二次谐波的估算式；举例分析了KDP三倍频方案中，基波位相畸变对二次谐波和三次谐波的影响；实验工作中，用哈特曼一夏克传感器分别对IO64nm倍频过程和790飞秒超短脉冲倍频过程中的基波和谐波的位相分布进行了测量，给出了相应结果。

In chapter one, it compared letters with pictures and showed the importance of observation. In chapter two, it introduced the structure of human eyes and the course of vision. Chapter three introduced the basic key element of vision and the main theories of studying in vision aesthesia. In chapter four, it analyzed the principle of understanding the meaning of a figure according to the theory before, and analyzed the law of aesthetic. Then it explained how people feel the three-dimensional form and the movement, which have offered the theoretical foundation for creating more vivid image. It expounded the purpose and meaning of judging a visual figure in the fifth chapter, and introduced three general standards. It showed a method of judging the figure from different points of view in an example. Summarize to the full text finally, it point out the correct observation of vision image is one of the main ways for people's study, proposed the weak point of this text.

本文在第一章对文字与形象两类视觉信息进行了比较，提出了掌握形象观察方法的重要性；接着在第二章简单介绍了人眼的构造和视觉成像的过程；第三章分别介绍了视觉感知的基本要素和目前研究视觉的主要理论；在第四章，根据感知理论重点分析了人们识别、理解图形意义的原则，并由此归纳总结了形式美感产生的规律，提出了创造生动的视觉形象和构筑立体形象的规则和方法；第五章则阐述了对视觉形象进行评价的目的和意义，介绍了评价的三大普遍标准，针对人工形象提出了一套评价系统，并通过一个实例来说明评价系统的使用过程；最后对全文做出总结，指出正确的认识视觉形象是人们学习的主要途径之一，并提出了本文的不足之处。

The centennial xingtan square, the top three branches ofspicy camphor, KuXiao three, called "three wick sweet", Right ","top camphors citron, shaped like a fifth citron.

杏坛广场左侧有百年香樟，顶分三枝，酷肖三香，名为&三炷香&；右侧&佛手樟&，顶分五枝，形如佛手。

Three light cruisers three destroyers and three smaller vessels are lost along with 188 aircraft.

三轻巡洋舰，3艘驱逐舰和3个较小的船只，失去了与188架飞机。

In this dissertation the"Penalty"finite element method was employed to compute the velocity of the three-dimensional flow of power-law fluid in a profile die. In order to decrease the needed computer memory and raise the stability of numerical simulation, a set of decoupled methods such as PFEM, pseudo-body force method and transformation of momentum equation to the elliptic equation was developed to establish the general finite element equations to compute the distributions of velocity and viscoelastic stress of the three-dimensional viscoelastic flow of the Phan ThienTanner fluid in a profile die. During numerical simulation of the extrudate swell of the PTT fluid, the flow in the die and out of the die was analyzed separately, which demands less computer memory. The key techniques used in numerical simulation of the three-dimensional extrusion from dies such as decision of boundary conditions, creation of initial velocity field, selection of penalty factor, high Weissenberg number problem , regeneration of the free surface were studied in detail.

中文题名聚合物异型材口模挤出三维流动研究副题名外文题名 Study on three-dimensional flow of polymer melts during the process of profile extrusion from dies 论文作者涂志刚导师柳和生包忠诩教授学科专业材料加工工程研究领域\研究方向学位级别博士学位授予单位南昌大学学位授予日期2001 论文页码总数148页关键词挤出成型聚合物材料挤出口模聚合物异型材馆藏号BSLW /2003 /TQ320 /9 本文建立了求解挤出口模内幂律流体流动速度场的通用三维罚有限元模型；对于非线性粘弹性的Phan Thien-Tanner流体，为了降低模拟计算对计算机硬件的要求，并使模拟计算更加稳定，采用了一种去耦算法，包括罚有限元方法、拟体力方法和动量方程的椭圆类方程转化方法，并建立了求解速度场和粘弹性应力场的总体有限元方程；对于PTT流体的挤出胀大问题，提出了挤出胀大熔体口模内外分离模拟法，这样可以显著降低数值模拟对计算机硬件的要求。

These three heavy identities are three kinds of angle of views that she observes the world, and in her works, also usually body these three kinds of fusions of angle of views.

这三重身份是她观察世界的三种视角，在她的作品中，也往往体现了这三种视角的融合。

The three "goose" word, can understand that a child hears geese for three, can also understand for children playing in the water, the goose is very happy, happy and even call three goose, goose, goose.

这三个&鹅&字，可以理解为孩子听到鹅叫了三声，也可以理解为孩子看到鹅在水中嬉戏，十分欣喜，高兴地连呼三声&鹅、鹅、鹅&。

Three people and two dogs went forward to the parking lot at the basement of the park. This three-month-old puppy was so weightless and trying to struggle in Belinda's arms. So She put the puppy on the ground to let it walk a little bit. The puppy made a big pile of "Poo-Poo" immediately. Belinda was so shocked. How this skinny and weightless little three-month-old puppy would make such big pile of shit!

三人二狗往大安森林公园的地下停车场取车的路上，这只小黄狗大概才三个多月大，抱起来没有几两重，在蓓的怀里有点想挣扎，於是蓓把她放在公园地上走一下，她就忍不住在公园作了一陀好大好大的『蛋糕』，说实在的蓓可是吓了一跳，怎麼这只瘦瘦小小据说才三个月大的狗狗，便便的SIZE那麼大！

In 1940, a French infantry division was made up of three infantry regiments (each one having a headquarters company, a weapons company and three battalions), one cavalry unit tasked with reconnaissance, one anti-tank company (12 25mm anti-tank guns), one light field artillery regiment with three groups of 12 75mm guns each (plus an anti-tank and anti-aircraft company to protect the field guns from enemy tanks and aircraft), one heavy field artillery regiment (two groups of 12 155mm howitzers each), two engineer companies, two signals companies, two transport companies, one ammunition company, one medical group and divisional services.

在1940年，一个法军步兵师由三个步兵团(每个都有一个司令部，一个武器连和三个营)，一个负责侦察的骑兵部队，一个反坦克连(12架25mm反坦克炮)，一个轻型野战炮团配备有12架75mm炮三组(再加上一个反坦克防空连保护野战炮不受敌人坦克和飞机的攻击)，一个重型野战炮团(12架155mm榴弹炮两组)，两个工兵连，两个通信连，两个运输连，一个军火连，一个医疗大队和师后勤部门。

He has four hits, three walks, three homers and four RBIs in the past three games.

他在最近的三场比赛击出4支安打，获得3次保送，囊括了3支全垒打和4分打点。

Foods high in this vitamin include oily fish such as salmon, tuna and, and fish liver oils.

维生素D含量高的食物包括诸如大麻哈鱼、金枪鱼和鲭鱼之类的油鱼以及鱼肝油。

We need you to cosign our public letter demanding that press intimidation cease immediately, and that all charges be dropped.

我们需要您cosign我们的公共信，要求记者立即停止恐吓，并要求所有收费下降。