套环

In order to develop an useful synthestic process, we have synthesized amides with various substitutents. The isoquinoline skeleton was constructed through Bischler-Napieralski reaction, followed by asymmetric reduction of the imine intermediates with a Ru complex to form the only chiral center. Finally, we connected the two phenyl groups by Heck reaction and effectively obtained optically active aporphine alkaloids.

为了发展一套实用的合成方法，我们首先制备於苯环上具有不同种取代基的苯乙醯胺，接著透过Bischler-Napieralski反应进行分子内合环，并利用钌金属对亚胺中间体进行不对称的还原反应，建立出产物中唯一的光学活性中心，最后再利用Heck反应连结两个苯环，就可以顺利得到具有光学选择性的阿朴吩类天然物。

Jinzhou Chemical landing six branches now have the world's larger 5,000 tons / year, Central Sulfolane a plant to produce 1,500 tons mainly isopropylamine / devices in a production, domestic production of methyl iso unique ---A, two isobutyl ketone and methyl isobutyl ketone methanol mainly 1,500 tons / year of a production plant.

锦州六陆化工分公司目前拥有世界上较大的5000吨/年环丁砜生产装置一套、以生产异丙胺为主1500吨/年生产装置一套、国内独有以生产甲基异丁基酮甲酮、二异丁基酮和甲基异丁基酮甲醇为主1500吨/年生产装置一套。

In the early days of astronomy before the advent of Newton's f=ma, planetary events were predicted on Ptolemy's model of nested circular orbits -- wheels within wheels.

在天文学的早期，也就是在牛顿的f=ma出现之前，对天体事件的预测都是通过托勒密的嵌套圆形轨道模型——一环套一环的复杂模型——进行的。

In allusion to the lower measuring efficiency and inconvenience during the measurement of dynamic contact resistance of slip-ring, addressed improving methods for preventing the leads from intertwisting each other, and developed a measuring system for solving dynamic contact resistance measurement of slip-ring.

针对目前导电环动态接触电阻测量中由于导线缠绕导致检测效率低下、操作不便、不便较长时间观察导电环性能稳定性等问题，提出解决绕线问题的测量方法，并在此基础上研制一套导电环动态接触电阻测量系统，以解决动态接触电阻测量的技术难题。

According to the GOC needing and the project of GD technology, this project is Base on GoC's SO2 production equipment and launched by GD University. The user of this system is GOC.Intelligent diagnosis technology is the integration of neural network technology, expert system technology and database technology, which is the result of development of science and technology. Making full use of it can diagnose faults effectively, guarantee the normal work and increase the productivity. It can also prevent the blindness of diagnosis and make the managements more normative. It has significant benefit on environment pollution diagnosis. In this paper, this Database system is summered and prospected.

本项目是根据广州石化安环部提出的：&广州石化重点污染源监测数据采集、分析与控制系统&建设需求及2002年广东省科技计划项目：&制造业企业环境管理体系建立与运行控制的关键技术研究&建立的；项目的开发方为广东工业大学，系统的用户为广州石化安环部，以广州石化年制硫量2万吨装置为研究对象，研究出一套通用的污染因素分析方法，在此分析方法之上，开发出一套基于数据库的污染源智能诊断专家系统，当出现污染物超标时，能根据各种工艺参数，快速、自动的推断出污染源的位置，从而可以采取相应的措施，控制污染物的排放，减少污染物的排放量与降低污染物的排放浓度，使得企业在满足环保要求的情况下连续有序的生产。

Our company is an emerging Carbon Co., Ltd., mainly engaged in all kinds of graphite fixed ring, graphite stationary ring, graphite sleeve, thrust plate, graphite bearing, graphite bearing covers.

我公司是一家新兴的电碳有限公司，主要经营各种石墨动环，石墨静环，石墨套，推力板，石墨轴承，石墨轴承套等。

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

Company Main Products: silicone bracelet, silicone sets (MP4 sets, game sets, sets of learning machine, mobile phone sets, cameras kits, etc.), sets of silicone ear plugs, swimming cap, swimming mirror, flippers, silica gel tableware (Cake Mold, Silicone tongs, silicone scraper, silicone tablespoon, ice lattice, coffee mats, Placemats, etc.), silica gel watchband, U disk wrist band, cap of a pen, mouse wheel, silicone keys, O-type ring, ring, toy wheels, foot products such as silicone rubber.

公司主营产品：硅胶手环、硅胶套（MP4套、游戏机套、学习机套、手机套、照相机套等）、硅胶耳塞套、游泳帽、游泳镜、蛙鞋、硅胶餐具（蛋糕模、硅胶夹钳、硅胶刮刀、硅胶汤勺、冰格、咖啡垫、餐垫等）、硅胶表带、U盘手腕带、笔套、鼠标滚轮、硅胶按键、O型圈、密封圈、玩具车轮、脚垫等各类硅橡胶制品。

The company also specializing in the production of supporting a variety of cold extrusion steel, cone thread connecting sets, rolling straight thread connecting sets, stripping rib straight thread connecting sets, torque wrench, the wrenches, cutting tools, thread gauge, smooth gauge , The teeth of regulations, such as ring-regulation.

公司还专业生产相配套的各种规格的冷挤压钢套、锥螺纹连接套、滚压直螺纹连接套、剥肋直螺纹连接套、力矩扳手、工作扳手、切削刀具、螺纹量规、光滑量规、牙型规、环型规等。

In order to coordinate with the model experiment of rotor, three rotor temperature measurement systems are developed in the paper. System No.1 transfers temperature signal through slip rings. Multi-channel switch circuit is installed on the rotor and changes multi-channel input into one-channel output, thus multi–channel temperature signal can be transferred through less slip rings than the common solution.

为了配合转子模型的实验工作，本论文研发了三套转子测温系统：第一套是通过滑环传递温度信号的测温系统，转子上安装多点信号切换装置，将多路信号输入变为选通的一路信号输出，可以利用较少的滑环传递多路信号。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。