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Summary: This system imbeds the multi-axis motion controller PMAC card into PC to constitute open numerical control system applied in horizontal twin spindles double column drill press, using the software of the PMAC card, and the software and the hardware resources of PC, this system complete the numerical control function for the horizontal twin spindles double column drill press, and incarnate the open character of the system adequately.

本系统采用多轴运动控制器PMAC卡嵌入PC机的模式，构成一种专门应用于双主轴龙门钻床的开放式数控系统，利用该卡配置的软件和PC机的软、硬件资源，使系统完成双主轴龙门钻床的数控功能，并充分体现系统的开放性。关键词：数控系统，PMAC，双主轴龙门钻床。

Summary: This system imbeds the multi-axis motion controller PMAC card into PC to constitute open numerical control system applied in horizontal twin spindles double column drill press, using the software of the PMAC card, and the software and the hardware resources of PC, this system complete the numerical control function for the horizontal twin spindles double column drill press, and incarnate the open character of the system adequately.

邬再新，吕洪波摘要：本系统采用多轴运动控制器PMAC卡嵌入PC机的模式，构成一种专门应用于双主轴龙门钻床的开放式数控系统，利用该卡配置的软件和PC机的软、硬件资源，使系统完成双主轴龙门钻床的数控功能，并充分体现系统的开放性。

LongPo Electric Co.,Ltd is seated in Huaibei city,at present there has two plant areas and production base,covers a land of 35,000 square meters,the construction area is about 22,000 square meters.the company owns inward Wiedemann Punch of Centrum2500,numerical control plate shearing machine,numerical control benders and other advanced machinery equipment and the first-class specilalized production base and workshop for manufacturing vacuum circuit breaker in the domestic,it also owns the inward KOCOS2000 detecting apparatus and the assembling line of circuit breaker computer program-controlled,making the company have the very strong production and assembling ability.

龙波电气位于安徽省淮北市，现建有二个厂区及生产基地，占地约3.5万平米，建筑面积约2.2万平米。公司拥有进口的威德曼多工位数控转塔冲床，日本数控折弯机、剪板机等先进机械设备和国内一流的专业制造断路器生产基地、车间，拥有德国进口的KOCOS2000检测仪器和断路器电脑程控装配流水线，具备相当规模的生产装配能力。

By using two different three-dimensional source distri- bution techniques, three-dimensional translating-pulsating source (3DT) and three-dimensional pulsating source (3DP), numerical investigations have been carried out for a high speed monohull ship (RD-200) advancing in oblique waves. The numerical results are compared with experimental values obtained from wave load tests carried out at the SSPA. These extensive test results cover different wave directions at a wide range of wave frequencies.

本文在高频运动的假设之下，使用一种简化的三维振荡(3D pulsating)格林函数，3DP，以及与实际波系接近的三维前进－振荡(3D Translating-pulsating)格林函数，3DT，对於一艘高速单体船(RD-200)进行斜浪中规则波之波浪动态压力负荷分析；理论计算将以两种三维源点法进行波浪负荷评估并与由船模试验加以验证，船模实验於瑞典SSPA方型风浪水槽进行。

In the background of numerical simulation for the transonic flow about advanced transport aircraft with wing-mounted nacelles, great efforts have been made in this thesis for the improvement of the grid generation technique and the numerical methods for solving the Euler equations.

本文以民用飞机复杂外形跨音速绕流数值模拟及气动力分析为应用背景，在复杂空气动力外形网格生成技术，Euler方程数值求解方法的改进。。。

We use the single particle model and find a new nonlinear resonant acceleration criterion analytical: nw(1)+mw(2)=NW, m,n,Nare integers, w(1,w(2), W are the frequency of the two waves and the charged particle cyclotron respective,this result can be extended to the multiple waves ,we make numerical simulation and numerical results are consistent with the analytical results. This paper consists six chapters.

因此本文从基本的情况开始，以两个静电波与磁化等离子体相互作用问题为研究出发点，通过多标度展开的理论方法，求解带电粒子的运动方程，得到的一个新的非线性共振加速条件：nw(1)+mw(2)=NW，（m，n，N为整数，W，w(1)，w(2)分别为带电粒子的回旋频率以及两个静电波的频率），该结果可以推广到多个静电波作用于磁化等离子体的情况，随后通过数值计算证实了解析结论的可靠性。

In order to deal with the numerical stability of convection dominated problems, using the local upwinding weight function, the upwinding local radial point interpolation method is proposed based on the local radial point interpolation method, and were then compared with those numerical results of the LRPIM.

为处理对流扩散问题中对流项占优时的数值稳定性问题，采用局部上风式权函数，在局部径向基点插值无网格法基础上构建了上风式局部径向基点插值无网格法。

Aiming at simpling the structure of numerical control system, and decreasing the cost and difficulty of development, a numerical control system based on the programmable logic controller was designed for a stereolithography apparatus machine with utilizing the prominent feature of the easy development and higher reliability of the PLC.

为简化光固化快速成形数控系统的结构、降低系统开发的成本和难度，结合所设计的成形设备特点，利用可编程逻辑控制器具有的开发简单、性能可靠等优点，设计了一个基于PLC的光固化快速成形数控系统。

Experiment 7 investigated the saccades feature and number distance effectusing the numerical comparison task under endogenous attention.Experiment 8 investigatedthe saccades feature and number distance effect using the numerical comparison task underexogenous attention.

实验7在内源性注意条件下，采用数字大小比较实验任务，考察数学学优生和学差生数字加工中的眼动特征和距离效应；实验8在外源性注意条件下，采用数字大小比较实验任务，考察数学学优生和学差生数字加工中的眼动特征和距离效应。

In this paper, a theoretical investigation of the drag and noise reduction by riblets is carried out, and these numerical results are compared with those obtained from experiments with riblets in water tunnel, and it is found that they agree with each other in tendency and numerical value.

本文从理论上分析了条纹表面的减阻降噪特性，并将计算结果与水洞模型贴膜实验进行了对比，两者在趋势和数值上基本一致。

Pachomius manual labour was organized as an essential part of the monastic life; and since it is a principle of the monks as distinguished from the mendicants, that the body shall be self-supporting, external work of one sort or another has been an inevitable part of the life ever since.

根据圣pachomius体力劳动组织作为一个重要组成部分寺院生活；以来，这是一个原则的和尚，作为有别于乞丐，该机构应自支撑，对外工作的这种或那种已一个必然的一部分，生活至今。

In order to study the effects of parametrical rolling on the ship movement and tilts, in allusion to ship's navigating in regular following waves, the equation of ship rolling motion is transformed into normal Mathieu equation by proper variable replacement when strong parametrical excitation in restoring moment varied according to sine or cosine wave.

为研究参数横摇对船舶运动和倾覆的影响，通过对船在规则波上随浪航行时，恢复力矩中出现的1个以正余弦规律变化的强参数激励项进行适当的变量置换，将船舶的横摇运动方程转换成标准形式的Mathieu方程。