环

Based on nonliner dynamic simulation model of BLDCM.simulation model of speed and double close loops of current are built in adjusting speed system for BLDCM.Through simulation the performance of BLDCM is researched,in the way PI adjustors of speed and current adopted,fuzzy control used in speed loop and PI adjustor used in current loop,which prepares theory base for controller design of high quality BLDCM.

在直流无刷电机非线性动态仿真模型基础上建立了转速、电流双闭环直流无刷电机调速系统仿真模型，对转速、电流环均采用PI调节器及转速环采用模糊控制器、电流环采用PI调节器的直流无刷电机性能分别进行了仿真研究，为高性能直流无刷电机控制器设计提供了理论依据。

The reactions involved in the co-curing are: cyclodimerization and cyclotrimerization of cyanates, polyetherfication of epoxy groups and cyclotrimerization of cyclic dimers, as well as the formation of oxazolidinone rings.

反应历程首先是氰酸酯发生自聚反应形成二聚体或三聚体，然后二聚体可进一步共聚形成三嗪环，此过程伴随着环氧基的聚醚反应，最后是三嗪环与剩余的环氧基反应形成NFDA1唑烷酮。

In chapter 3, general reaction of a-hydroxy epoxides were introduced. We have developed a newly gold-catalyzed ring opening reaction ofα-hydroxy epoxides containing carbon cycle. We have disclosed the rule of ring opening reaction. And the plausible mechanism was proposed.

第三章：首先介绍了α-羟基环氧化合物的反应，其次介绍了一个新的金催化的含碳环骨架的α-羟基环氧化合物开环反应，总结了反应规律，提出了可能的反应机理。

Ring expansion reactions are important tools in organic synthesis which take advantage of existing ring structures and avoid the unfavorable factors associated with other approaches in the construction of medium and large rings.

自由基成环和扩环反应是有机化学中的重要反应，它可以利用已有环的结构来构筑所需要的中环和大环，避免其他一些不利的竞争反应。

These results show that the ring expansion of cyclopropylsilylene C3H5SiH to silacyclobutene is easy to occur with a barrier of 113.4kJ/mol, while the 1,2-H shift is not competitive to the ring expansion for its much higher barrier.

结果表明，环丙基硅烯经过113.4kJ/mol的势垒扩环重排为硅杂环丁烯为自发反应；而其1，2-氢迁移重排反应热垒为190.0kJ/mol，是非自发反应，难于进行，不能与扩环重排相竞争。

Changed the two screws on the contact plate of the Halo-Vest to one screw,so that the Halo-Vest can fit extension-flexion movement and adapt the reduction of cervical spinal dislocation.Simultaneously,in order not to reduce the fixed funtion of the contact plate,which was designed in fan-shape.

将传统的Halo-Vest架头环与架子接板的双螺丝改为单螺丝，使不能伸屈的头环变为能够伸屈；将头环与接板的咬合面设计成扇形并且有放射状条纹，使头环能牢固地固定在任何一个伸屈角度上。

Mechanical seal assembly: In the dynamic and static loop mirror coating on the 20th floor cleaner lubricants; add lubricant bearing guided, first gently positioning ring static load bearing guide; longer shaft add the oil, the mechanical seal part of the dynamic ring gently into the shaft, the hand-push retractable seal ring should be able to freely (Note that dynamic and static part of the anti-ring to the assembly site to be in place).

机械密封装配：在动、静环镜面上涂一层洁净的20号润滑油；导轴承座抹上润滑油，先把静环轻轻定位装入导轴承座；再在泵轴上抹上润滑油，把机械密封的动环部分轻轻装渗透泵轴上，用手轻推密封环应能伸缩自如（注意动、静环部分的防转部位需装配到位）。

Mechanical seal assembly: In the dynamic and static loop mirror coating on the 20th floor cleaner lubricants; add lubricant bearing guided, first gently positioning ring static load bearing guide; longer shaft add the oil, the mechanical seal part of the dynamic ring gently into the shaft, the hand-push retractable seal ring should be able to freely (Note that dynamic and static part of the anti-ring to the assembly site to be in place).

机械密封装配：在动、静环镜面上涂一层洁净的20号润滑油；导轴承座抹上润滑油，先把静环轻轻定位装入导轴承座；再在泵轴上抹上润滑油，把机械密封的动环部分轻轻装入泵轴上，用手轻推密封环应能伸缩自如（注意动、静环部分的防转部位需装配到位）。

Mechanical seal assembly: In the dynamic and static loop mirror coating on the 20th floor cleaner lubricants; add lubricant bearing guided, first gently positioning ring static load bearing guide; longer shaft add the oil, the mechanical seal part of the dynamic ring gently into the shaft, the hand-push retractable seal ring should be able to freely (Note that dynamic and static part of the anti-ring to the assembly site to be in place).

机械密封装配：在动、静环镜面上涂一层洁净的20号润滑油；导轴承座抹上润滑油，先把静环轻轻定位装入导轴承座；再在泵轴上抹上润滑油，把机械密封的动环部分轻轻装入泵轴上，用手轻推密封环应能伸缩自如（注重动、静环部分的防转部位需装配到位）。

When the lock ring simultaneously with the question cone gear engagement ring gear, cone after contact friction moment in the role of the rapid speed of gear to reduce to synchronize with the speed equivalent to lock ring, the two synchronous rotation, relative to gear Central lock synchronization speed is zero, thus inertia torque also disappeared, then in force under the impetus of engagement sets unhindered and synchronization lock Gear engagement ring, and further engagement with the question of gear engagement ring gear and completed Shift process The topics mainly through the Pro / E synchronization software for the car to three-dimensional modeling structural design, and through the parameters of the design process to achieve its structure, and on this basis, the use of ANSYS FEM software structure of the typical synchronization And a finite element analysis, through structural analysis of its structural design is reasonable to assess and make recommendations to improve the design

当同步锁环内锥面与待接合齿轮齿圈外锥面接触后，在摩擦力矩的作用下齿轮转速迅速降低到与同步锁环转速相等，两者同步旋转，齿轮相对于同步锁环的转速为零，因而惯性力矩也同时消失，这时在作用力的推动下，接合套不受阻碍地与同步锁环齿圈接合，并进一步与待接合齿轮的齿圈接合而完成换档过程本课题主要是通过Pro/E软件对汽车同步器进行三维造型结构设计，并通过参数化实现其结构设计程序化，在此基础上，利用ANSYS有限元软件对典型同步器结构进行有限元计算与分析，通过结构分析对其结构设计的合理性作出评价并提出改进设计建议

Shop assistant: Please check at the door.

店员：请您到门口柜台交费。

In the end, transportation of PAHs in the environmental matrix was preliminarily investigated and discussed according to PAHs data of soils and sediments from a certain region in Shanghai. The result indicated that there are two or more pathways on PAHs transportation in the environmental matrix.

最后，对上海特定地区内PAHs在环境介质中的迁移径途进行了分析讨论，结果表明上海市土壤和沉积物等环境介质中PAHs的迁移存在多种途径。