截面图

The bifurcation and chaos behavior of impact and rubbing fault rotor system caused by the parameters of nonlinear rigidity, rotor rotating speed, eccentric mass is analyzed, in the numerical value analysis method. The bifurcation diagrams, maximum Lyapunov exponent diagrams, Poincaré maps, phase plane portraits, trajectories of journal center, time-history curve, amplitude spectra diagrams of the rotor motion are used. The convert and evolution course of periodical response, quasi-periodical response, double-periodical bifurcation, chaos of the system response is analyzed.(3). It is deduced that the general differential equation of bending-torsional-pendular coupling vibration about rotor with the gyroscopic moment. On the basis of this equation, the general differential equations of coupled bending, torsional and pendular nonlinear vibration about rotor with unbalance character and rubbing character are deduced.

2建立了具有非线性刚度的转子系统在非稳态非线性油膜力作用下的径向碰摩动力学微分方程，并应用含高阶余项的非线性动力方程的线性化数值法研究了此类系统响应的复杂动力学行为，利用转子响应的分岔图、最大Lyapunov指数曲线、Poincaré截面映射、时域波形、相轨线、轴心轨迹、幅值谱等图形分析了系统响应的周期运动、拟周期运动、倍周期分岔、混沌等运动形式的转化与演变过程，重点研究了非线性刚度、转子转速、偏心质量等系统参数对碰摩故障转子系统的分岔和混沌行为的影响。

This paper has introduced how to use the graph theory method to calculate the sectorial coordinate of the variable cross-section box girder.

作者单位：湖南科技大学土木学院，湖南湘潭 411201摘要：介绍了用图论法计算变截面箱梁断面的扇性坐标。

In this paper, The delta wing of Mach number 0.8 at an attack angle of 21. 8 degree is simulated by our program. Then, using the visualizing program, we map the figures of space streamlines, cross streamlines near the vortex axis, three dimensional vortex lines, cloud atlas for pressure and vortex and targer of particles.

在这一章里，我们先用所建立的计算软件数值模拟了来流马赫数为0.8、攻角为21.8°的三角翼的流场，之后以拓扑分析结果做指导，研制了一套数值显示流场、旋涡结构的软件，用该软件我们绘制了跨音速三角翼背风区涡轴附近截面流线、空间流线、三维涡量线、压力和涡量云图以及粒子屏痕图。

M. The design of a time resolved flat-response x-ray imaging system has been accomplished, with the combination of Wolter x-ray microscope, x-ray streak camera, and a compound filter.

利用Wolter X光显微镜收光立体角大，而且在收光立体角截面上容易划分成不同区域的特点，用X条纹相机作为图象记录系统，完成了一套在0.1～1.5 keV能区对X光能量平响应的高时空分辨测量系统的设计。

On the basis of imaging distance, SLM's physical microstructure and Fresnel diffracting condition, the holographic sampling, calculating and coding methods have been designed.

论文摘要：文章探讨了面向空间光调制器的三维全息编码方法，以数字微镜器件为空间光调制器，利用截面叠加合成全息图的方法，分析了成像距离与会聚透镜焦距等参数之间的关系，根据成像距离、SLM像素结构和Fresnel衍射条件，设计了全息抽样、计算和编码方法。

A kind of special encasing material is developed and used to reinforce the part in the project, which can compound different color according to different requirement .It provides obvious gray scale contrast between the image of part and encasing material and it can obtain the accurate contour of a parts cross section. This kind of material has good machinability, additives and proper toughness. The whole encasing process is simple and rapid.

本项目开发研制了一种专用封装材料来封装被测零件，封装材料根据不同的需要，可以配置出不同的颜色，使得与被测零件的图象颜色具有较明显差别，能够提取出精确的零件截面的边界轮廓，并且具有良好的粘合性能、机械性能和适当的韧性，操作也比较简单。

According to practical work condition, section of a three segment hoist boom is self-determined with SECWRITE commands, then a finite element model is directly established in ANSYS environment with ANSYS finite element analysis software. Using Beam44 beam unit and node degree of freedom coupling technique to simulate connecting between each boom section and conduct finite element analysis, calculated result of stress deformation for the boom is obtained. The result from digital simulation is in relative coincidence with theoretical analytic result and the nonlinear decline occurrence in boom bending moment curve is explained.

以ANSYS有限元分析软件为工具，按吊臂实际工况，运用SECWRITE命令自定义三节吊臂截面直接在ANSYS环境下创建有限元模型，使用Beam44梁单元和节点自由度耦合技术模拟各节臂的连接，进行有限元分析，得到吊臂应力变形数值计算结果，数值模拟所得结果与理论解析解相吻合，解释吊臂弯矩图出现非线性下降的原因。

The final contribution of gluon-gluon fusion to total cross section can be as large as 5％ of that of quark annihilation because of the large luminosity of gluon in hadron collider.

虽然胶子聚合只有圈图阶的过程，但是由于强子对撞中胶子的高亮度，最终胶子对总过程截面的贡献也可以达到相应夸克贡献的5％。

Secondly, it summarizes the development of cold-formed sections and latest trend about stability of cold-formed beams and purlins. Finally, some possible improvements in stability of cold-formed beams and purlins are anticipated.

其中普通钢结构主要指采用大截面和厚板的结构(因表面涂有防锈漆，俗称&红钢&的结构)；而轻钢结构则主要指以轻型H型钢或冷弯薄壁型钢作为承重骨架，用轻型板材作围护的结构(图 1 )。

The SEM photos show that the powder of carbon cluster-like material is short fiber with the round cross section in the length scale ofμm.

FT-IR光谱表明：700℃与1000℃制备的材料其微观结构有较大差异，因此对微波的共振吸收性能也不相同；SEM图则显示碳团簇粉末在微观上成短切纤维状，截面呈圆形，长度在微米量级。

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