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In Chapters 3 and 4, we investigate the existence of periodic solutions of a class of second order functional differential equation and a class of third order functional differential equation, respectively, and obtain new sufficient conditions of their existence result of periodic solutions under growth conditions and linear growth condition, respectively. Compared with some known results in the literature, the equations discussed by us are more general, and our results are concise and easy to be verified.

第三章与第四章分别研究了一类二阶泛函微分方程及一类三阶泛函微分方程的周期解存在性，分别在增长条件及线性增长条件下，获得了这两类方程周期解存在性的新的充分条件，与文献中已知结果比较，我们所讨论的方程更为一般，所得结果较简洁且易于验证。

Starting from the fundamental equations of stochastic medium theory, the ore-drawing with inclined wall boundary conditions is discussed in the paper.

本文从随机介质理论的基本方程出发研究倾斜壁边界条件下的放矿规律，在易于求解的仿射坐标系中，应用差分方法对矿岩移动的速度场进行了确定。

And it will design simple structure, low cost, easy to use gas furnace and structural design parameter.

并设计结构简单、成本低、易于使用的燃气炉，给出结构设计参数。

Comparable to other methods, this algorithm mainly has four advantages:(1)It is effective and can be easily realized (2)The output is G -continuity surface (3)It is suitable for the object with arbitrary topology (4)It allows the distribution of data point sets asymmetrical.

与其他无组织散乱数据重建算法相比，本文算法主要有4个优点：(1)运行效率高，且思想简单易于实现；(2)输出结果为具有G 连续的曲面；(3)适用于任意拓扑结构的物体；(4)允许数据点集的分布具有一定的不均匀性。

Using special software called Exodus, Galea also calculated how long it would have taken to evacuate the towers if they had been fully occupied.'What happened on 9/11 was horrible, but it could have been a lot worse.

英国专家目前正在对美国"9·11"事件幸存者们遭遇危机时刻的反应进行分析，目的是总结经验教训，以便使英国正在增多的摩天楼盖得更加安全和易于人员疏散。

This paper mainly consists of three parts:(1) Based on the Reddy's higher-order shear deformation plate theory and general von Kármán-type equations, put forward the governing equations of pre- and post-buckled vibration of several hybrid FGM plate forms which have not been studied adequately, triumphantly applying the perturbation technique combined with Galerkin method into equations solving, and get the comparatively simple result forms with complicated deduction at last;(2) As a new type of materials, piezoelectric fiber reinforced composite actuators were applied to optimal vibration control, interrelated informatons be depicted in this paper;(3) During the investigative cource, some factors not been considered adequently in other researches were discussed fully in the postbuckled vibration analysis, such as the temperature-dependent material coefficients, heat conduction and nonlinear vibration characteristic etc.

本文的研究工作主要包括：(1)基于Reddy高阶剪切变形板理论和广义Kármán型方程，给出了几类现有研究成果较少或没有彻底解决的FGM混合板结构的屈曲前和屈曲后振动特性研究的控制方程，成功将摄动-Galerkin混合法应用于求解过程，并给出了各控制方程相对直观且易于计算的解析解形式；(2)单向压电纤维增强复合材料(Piezoelectric Fiber Reinforced Composite，简称PFRC)是一种新型压电材料，本文将其应用到了结构振动控制研究当中，发现通过压电纤维体积含量的选择可以实现混合板结构的优化振动控制；(3)围绕几种有代表性的FGM混合板结构，讨论其屈曲后的振动特性，在分析中同时考虑热传导，材料物性参数的温度相关性，以及机/热/电荷载耦合效应对非线性振动特性的影响，最后给出了大量数值计算结果。

The latest type explosive motor utilizes cheap low qu***ty fuel Low temperature complete combustion, By means of warmhearted water Gasify to absorption of heat to lower the temperature supercharge , Promoteing the gas motor dos .

在释放阶段，外燃（200年前的蒸汽机）——内燃（100年前的内燃机）——爆燃是完全不同的，根本不在一个层次）。但也只有比较才易于理解：理论空燃比、充分的混合这些条件是任何现有热机都可望而不可即的。

GB . The web interface is very user friendly and easy to use.

该网站的界面是非常用户友好和易于使用。

Differing from the general BEM that is attributed from the general boundary integral equation, The natural boundary element method attributed from the natural BIE has not only the advantage of the dimensionality, but is confirmed and gain the only NBIE from the original problem.

无网格方法仅仅需要节点信息，克服了有限元等传统数值方法对网格有较强依赖性的缺点，摆脱了网格的束缚，避免了大量的网格分划、复杂的网格生成及重新划分的工作，减少了因网格畸变而引起的困难，而且收敛快、精度高、易于实现和进行后处理工作。

This model can analyze the regression relation between covariate and log survival time, and its form and explanation of regression coefficient is close to the general linear regression equation, the explanation of analysis results is more simple, more direct and easier to understand than that of proportional hazard function model.

AFT模型研究协变量与对数生存时间之间的回归关系，模型的形式与对回归系数的解释与一般的线性回归方程相似，而对分析结果的解释则较比例风险回归模型简单、直观，更易于理解。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐