控制

This design is the engineering of the instrumentation system to thereactor in PX Plant in which there are 4 single loop control, 2cascade control and all the controllers and control valves areselected and calculated carefully to the system, the CENTUM controlsystem will be used .

本设计对PX装置异构化单元反应器进行自动控制系统设计，其中共设计单回路系统4个，串级控制系统2个，并对控制系统所涉及到的控制器，控制阀等进行了选择且进行了相关的计算。

Thermal hydraulics: feat systems, noesis agitate sending systems, anti-lock braking systems, cerebration gear, render shot systems, astir support systems, lubrication systems* Gas dynamics: pneumatics, propulsion, sterilization, expose and clean cycles, high-pressure gas, pedal transmission, adsorption, pedal form reactions, HVAC, ECS, multi-species aerosolized systems* Multiphase fluids: refrigeration, air-conditioning, status control, cryogenic piping networks, steam/water systems, or render systems with exotic, vaporific fluids.* Systems curb element and code assessment data acquisition distribution rates, anachronic communication, similarity and digital electronic filters, curb wrap enforcement rates, meshwork (CAN charabanc communication, etc.* Fuel cells: stationary or mobile.* Electrical systems: AC/DC machines, noesis electronics, batteries, etc. Flight dynamics, and curb systems of every kinds including digital filters

MSC Easy5的独到之处在于：其一，强大的控制系统仿真分析能力，可以建立各种复杂的控制系统模型，包含稳态分析、线性系统分析、频域响应、根轨迹分析等完整的控制系统分析类型；其二，多学科专业应用库，借助专业应用库中的预定义模型元件，向用户提供独一无二的建立系统级模型和研究多学科系统耦合问题的能力；其三，卓越的代码生成和求解器，可以由图形化系统模型自动生成相应的FORTRAN或C源代码，这些代码可以通过编译生成可执行程序，并可被用户调用；其四，高效的高级建模和二次开发功能，方便用户创建用户化模型元件，并可调用外部FORTRAN或C子程序；其五，与其它CAE软件良好的集成能力，可以将不同CAE软件所建立的模型集成到MSC Easy5中建立完整的虚拟样机，是真正的协同仿真平台。

Based on the characteristic equation of asynchronous motor,the conception of slip control was discussed.

以异步电动机机械特性方程为基础，讨论了转差率控制的基本概念，分析了转差率控制的基本规律，设计了基于转差率闭环控制的异步电动机变频调速系统，并介绍了该系统的主要特点。

The characteristic exponent based on a probabilistic dynamical system is calculated, which provides some useful information on unstable periodic orbits of the chaotic economic dynamical system. An effective controlling parameter is chosen by discussing the sign of the characteristic exponent. Furthermore, the control regions of the parameter variable are proposed. Therefore the controllable domain of chaos in the chaotic economic model can be obtained.

提出一种等价关系，计算基于概率的动力系统的特征指数，给出混沌经济动力系统的不稳定周期轨道的有用信息，通过讨论特征指数的符号，选择有效的控制参数，得到相应的控制参数取值范围，从而得到混沌经济模型中的参数变量的混沌控制域。

The results show that this strategy is feasible and effective and can also restrain the chattering phenomenon of the control system better.

仿真结果表明了该控制策略可以有效地抑制传统滑模控制系统的抖动现象，达到更好的控制效果。

The stochastic Bonhoeffer-Van der Pol system is first transformed into an equivalent deterministic system using the Chebyshev polynomial approximation, so that the problem of controlling stochastic chaos is reduced to the problem of controlling deterministic chaos in the equivalent system.

首先运用Chebyshev多项式逼近的方法，将随机Bonhoeffer-Van der Pol系统转化为等价的确定性系统，使原系统的随机混沌控制问题转换为等价的确定性系统的确定性混沌控制问题，继而可用Lyapunov指数指标来研究等价确定性系统的确定性混沌现象和控制问题。数值结果表明，随机Bonhoeffer-Van der Pol系统的随机混沌现象与相应的确定性Bonhoeffer-Van der Pol系统极为相似。

Now it is treated by chemotherapeutics, but AIDS can't be cured ompletely by this way and it can be still spread. So, as one of the most successful methods of treating disease, i perhaps noculating with vaccines will be found application significantly.

目前主要通过化疗药物进行治疗，不能从根本上治疗AIDS和控制HIV的进一步传播，因此，接种疫苗作为预防和控制感染性疾病最为成功和经济的健康干预措施之一，有可能在AIDS的预防和控制中发挥重要作用。

The subject of this seminar was divided into six sessions which were(1)clean technology and legislation update;(2) cleaner production through advanced process control;(3)beamhouse pollution control:practical views;(4)practical experiences in environmental management;(5)effective chrome tanning and (6) pollutioncontrol in leather finishing.

会议收集了22篇来自制革者和可能对制革清洁技术提出建设性意见的优秀论文。会议所分六个专题报告都取得圆满结果，这六个专题是：1。清洁技术和最新立法；2。通过先进的工艺控制进行清洁生产；3。准备工段污染控制：实际展望；4。环境管理中的实践经验；5。有效的铬鞣；6。皮革涂饰中的污染控制。

By contrast, article puts forward concept, type, principle and method of control cincture ,and carries on a controlling planning to aim at dispersion and concentration This will play a positive role in pushing sustainable development of small towns in forest zone in frigid area.

借鉴古代城墙在控制用地集约的优势，采用统计与比较的分析方法，通过对比，提出城镇建设顺序控制带概念、方法、类型、原则与内容，并针对我国寒地林区分散与集中的城镇形态进行控制带规划，这对寒地小城镇可持续发展将起到推动作用。

Later, it makes some comparison with four kinds of modulation technique, and finally, it implements the three-level PWM switching power amplifier with the PWM technique. The power of the amplifier is 2kVA, and the frequency bandwidth is 10～3kHz. In the thesis, the author designs and makes the hardwares of the switching power amplifier. The hardwares contain power inverter rank circuit, control system circuit based on DSP, drive and isolation circuit, and protective circuit. The thesis also analyses the potential safety problems and put forward some solutions for the problems. Furthermore, the thesis accomplishes the software design of the control system, and successfully debugs it. The methods of designing higher power ampilfier are also discussed in the thesis. It analyses the feasibility of the methods, outlines the way of how to design higher power switching power amplifier, and does some experiments with the method of switches-parallelling.

根据电动振动试验系统对开关功放的要求，提出了以电感电流瞬时值控制技术为基础的三电平脉宽调制开关功放的设计方案，并通过系统仿真进行了原理性论证；然后设计并制作了开关功放的硬件，包括功率转换电路，基于DSP的控制电路，驱动、隔离电路以及保护电路；针对开关功放数学模型不易得出的特点，细致分析了模糊自适应PID控制方法，在此基础上编写了控制程序；研制出一台功率为2kVA，通频带为10～3kHz的三电平脉宽调制开关功放；论文中还探讨了实现大功率开关功放的方法，分析了各种方法的可行性，给出了实现大功率开关功放的思路，并进行了并联开关管实现大功率开关功放的实验。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。