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In the light of hysteresis, creep and nonlinearity of piezoelectric actuators, two control methods are presented. One is PID feedback control with BP neural network modeling in feedforward loop. Another is Fuzzy-PI sectionalized multimodal control. They are used for highspeed and precise position control of models driven by piezoelectric actuators.

针对压电陶瓷存在迟滞、蠕变和位移非线性等不足，提出了两种压电陶瓷微位移驱动器的位置闭环控制方法：带有BP神经网络前馈模型的PID控制方法和Fuzzy—PI多模态分段控制方法，实现了压电陶瓷微位移驱动器快速、高精度的位置控制。

A new current controller is used in this thesis. Feedback stator current information and tunning the PI control parameters are not required in the new current controller.

在本论文中采用一种新型的电流控制器，它不但不需用到回授的定子电流，又可以免去调整PI电流控制器参数的困扰。

The results show that the fuzzy PI controller and the control strategy suppress the vehicle oversteering or understeering by the effective control of the brake force and the vehicle control stability is improved significantly.

结果表明：所设计的模糊PI控制器及控制策略可以通过制动力控制有效地抑制汽车的过多转向或不足转向趋势，提高汽车的操纵稳定性。

We have synthesized 4,4'-dinitro-3 4''-dimethyl triphenylamine,(1), in 84% yield in an one-step condensation process between 3,4-dimethyl aniline and 4-fluoro-nitrobenzene. After the auto-oxidation of (1) and the subsequent hydrogenation of the nitro-groups, an AB2 type triphenylamine polyimide intermediate bearing two amine groups and one acid-anhydride group each on individual phenyl ring,{AB2 PI Intermediate}, was prepared successfully. The yields of the autoxidation and the hydrogenation steps are 81% and 90% respectively.

中文摘要本研究以3，4-二甲苯胺及4-氟硝基苯为原料，经一步骤缩合反应得到产率为84 %之4，4'-二硝基-3&，4&-二甲基三苯胺(1)，由(1)经自氧化法后再以氢化法还原硝基，成功地制备出带有二胺基与一羧基的三官能基之AB2型三苯胺中间体(AB2型PI中间体)，自氧化反应与氢化法的产率各为81%及90%。

In accordance with the working characteristics and control requirements of the ball mill in cement plants, a self-optimizing PI control algorithm is introduced and implemented in this paper.

针对水泥厂球磨机的工作特性和控制要求，本文提出并实现了&自寻优-PI控制&的控制方法。

In this paper,a control strategy combining the fuzzy control method and conventional PID improved algorithm is introduced,and a Fuzzy-PI controller for cement mill is designed,at the same time electric energy is saved.

本文提出了将模糊控制方法和传统PID改进算法相结合的控制策略，并且设计了一种水泥厂磨机Fuzzy-PI智能节能控制器。

Fuzzy control is applied to variable-frequency regulating speed of AC induction motor in this thesis, where one kind of fuzzy controller of speed is designed with Mamdani model. Then the slip frequency control system made up of fuzzy controller is simulated, the simulation results show that its performance is better than that of general PI controller.

论文将模糊控制技术应用于感应电机的变频调速，采用Mamdani模糊逻辑模型，设计了一种转速模糊控制器，并对基于模糊控制的感应电机转差频率控制系统进行了数字仿真，结果表明模糊控制的控制性能优于常规的PI调节器。

The temperature examination used the temperature sensor or thethermo-element and carried on three-points examinations. These three points carried on the comparison and took the lowest point as the datum. Using the frequency changer's PI regulator realized closed loop automatic control.

温度检测采用温度传感器或热电偶，进行3点检测，并对这3个点进行比较，以最低点为基准，利用变频器内置PI调节器实现闭环自动控制。

By using the gauge potential decomposition, we have discussed the self-dual equation and its solution in Jackiw-Pi model. We obtained a new concrete self-dual equation and find relationship between Chern-Simons vortex solution and topological number which is determined by Hopf indices and Brouwer degrees of φ-mapping.

运用规范势分解理论研究了Jackiw-Pi模型中的自对偶方程，得到一个新的自对偶方程，发现了Chern-Simons多涡旋解与拓扑荷之间的联系。

I shake my head like a drum-shaped rattle like the mother out, then walking Xigua Pi -- a slip down.

不， 你，也。我摇动我的头同类一鼓-作形像母亲一样嘎嘎响，然后步行 Xigua Pi-下来的滑。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。