机构

A multiple-step beams model was established to analyze the static stiffness characteristics of the double parallel four-bar mechanism with right angle flexible hinges based on the symmetry of the structure. Formula for calculating the static stiffness was derived by applying singularity function. On the basis of this analysis, the factors influencing the stiffness performance of the double parallel four-bar mechanism were studied from its geometric parameters, and the theoretical model was verified by finite element method.

根据其结构的对称性建立了静刚度分析的阶梯梁模型，引入奇异函数法推导了柔性双平行四杆机构的静刚度计算公式，在此基础上，分析了柔性双平行四杆机构各尺寸参数对其静刚度的影响，并采用有限元方法对理论模型进行了验证。

It gets two conclusions. The first one is that the smaller the angle of the parallel joint pole is, the more quickly increasing push-force which acts on the oriented pin does. So it must try to pull out the inserting and drawing mechanism when the parallel joint pole is at the larger angle in order to reduce the extent of the inserting and drawing, i.e. trying to increase L_. The second one is that the forces which are exerted onhydraulic damper is more than the ones which are exerted on the oriented pin.

可知随着平行连杆所处的角度越小，导向销受到的推力增加得越快，所以要设法让插拔机构在平行连杆处于较大的角度时拔出，缩短插拔过程的行程，即应设法增大L_；在插拔机构的工作行程中，液压阻尼器所受到的冲击力大于导向销所受到的推力。

In this paper, based on the flexible multibody dynamics model of the virtual axis hybrid polishing machine tool, the differential — algebra hybrid equations is calculated by the Newton- Raphson method. The variety of the moving displacement, the velocity and the acceleration for the moving platform, leg, slider on the 3- PTT parallel mechanism and the pose curve of the series mechanism are obtained.

论文主要完成了在已经建立的虚拟轴混联研抛机床多柔体动力学模型基础上，应用牛顿—拉斐逊（Newton-Raphson）数值计算方法求解微分—代数混合方程组，得到3-PTT并联机构动平台、支杆、滑鞍各部件的运动轨迹、速度和加速度变化规律，以及串联机构的姿态变化曲线。

In the part of reverse displacement of the parallel manipulator is discussed, theforward displacement of two kinds of parallel manipulator is carried out, then, thequestion of passive joints is analyzed. At last, synthesis hereinbefore parts, theexamples are given.

在运动分析部分，研究了并联机构的位置逆解，并推导求解了两种并联机构的封闭位置正解，分析了各分支的被动关节的求解问题，综合以上各方面，给出算例。

A new-style 4-PUU parallel mechanism which has three-dimensional translation and one revolution around Z axis is presented in this paper.

介绍了一种新型4-PUU并联机器人机构，该机构可以实现空间三维的移动和绕Z轴的转动。

For the request of NC machining the tool track can be input in the G codes wayIn this paper there are analysis, calculation and simulation modeling to 2-DOF and 3D0F parallel translation mechanism.

根据利用并联机构进行数控加工的要求，本文还开发了接受以G代码的方式输入的刀具点运动轨迹从而控制被选机构运动的功能。

The proportion of staffs with college degrees or higher increased 18.6 %. The proportion of public health doctor was 9.7% in 1998 and was 8.7% in 2005. The educational level of village doctors did not change and more than half of them received the education of high school or special secondary school.(3) Compared to 1998, the immunization coverage rate of 2005 was increased. The highest incidence rate of infectious diseases appeared in 2005 and it was 3.953‰, and the lowest was 2.083‰in 2001. From 1998 to 2005, incidence of Hepatitis and Tuberculosis increased quickly. The incidence of Measles fluctuated greatly in theyears of 1998 to 2005 and the incidence of Pertussis and Tetanus keeped a low level.(4) When falling ill, the rural residents preferred the Village health departments. 310 residents know Iodine Deficiency Disorders , 73.8% of investigated school-age children had ever took parasiticide.

调查地区2005年与1998年相比，单苗接种率与五苗接种率均有提高，各县法定传染病发病率，2005年最高，为万分之39.53，2001年最低，为万分之20.83；调查的8个目标县，1998年～2005年计划免疫相关传染病，病毒性肝炎、肺结核发病率增高，麻疹发病率波动很大，百日咳、新生儿破伤风发病率保持在较低的水平； 4、村卫生室是农村居民首选的医疗机构，在患病后经常就诊的机构中，村卫生室选及率达68.3％，其次是乡卫生院，为42.3％；调查的居民中，有310名知道碘缺乏病，知晓率仅为39.6％；被调查居民中有607人家有学龄儿童，在这些学龄儿童中，448人曾服用过驱虫药，药物驱虫率为73.8％；曾发生过肠道寄生虫感染的儿童173名，肠道寄生虫感染率为28.5％。

Our reform on institution of supervision and protection to parolee should abide by the principle of special institution guiding and social factor assisiting .

对我国假释犯监督管理机构改革应遵循"专门机构主导，社会力量配合"的原则进行。

It should be the parole committee to take the responsibility of supervising and reform on institution of supervision and protection to parolee should abide by the principle of special institution guiding and social factor assisting.

对我国假释犯监督管理机构改革应遵循"专门机构主导，社会力量配合"的原则进行。

Beijing true-love educational service organization is a non-profit organization which combines the educational psychological study, practice and public interest and commits to the education equality and the children's potentials tapping. Its tenet is bring the world's first class education ideology and educational method to the public schools in China and create a good education environment through helping the teachers and the paterfamilias grasp these skills, so that the kids could physically and mentally grow up and have a colorful future.

北京真爱教育服务机构是一家教育研究、实践和公益相结合的非营利专业机构，致力于中国教育公平和儿童潜能开发的事业，其宗旨是把世界上先进的教育理念、教育方法带给中国最广大的平民学校，让老师和家长掌握这些方法，营造一个良好的教育环境，让所有孩子能够身心健康地成长，拥有一个美好的未来。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。