Vehicle Power Steering System Based on Human-simulated Intelligent Control

Thetraditional power steering by fluid drive has many defects such as producing extra steering, oil pollution and consuming excessive resources. Electric Power Steering is servo-control system which can supply power by motor which is controlledby micro-processor-embeded controller. So the application of Electric Power Steering Systemin vehicleis the developing direction. Based on the deep research of power steering system for vehicle, aiming at the complexity and uncertaintyof road and the difference for driver operating habit, the paper presents a sort of new algorithmthat is stronger in robustness, better in adaptability. The algorithmhas been applied in the physical vehicle steering system. The engineering practice shows that the algorithmtakes care of both control effect and person's feeling, and it is satisfactory to control effect.     

Design of Distributed Monitoring System of Wastewater Treatment Process

Based on introducing fieldbus and fieldbus control system, in this paper, a distributed monitoring system for city wastewater treatment network based on LonWorks is given, the construction, function and character of this network are analyzed.     

苹果蠹蛾入侵的影响因素及检疫调控措施

苹果蠹蛾是世界性重要的果树害虫之一,适应性广,危害严重,成为许多国家重要的检疫对象。为了更有效地防止苹果蠹蛾入侵中国主要水果产区,借鉴更安全环保的检疫处理和苹果蠹蛾发生区的控制措施,该文分析了苹果蠹蛾的传播途径和成功入侵的影响因素如寄主植物、温度、湿度、降雨和光周期等,并重点介绍了溴甲烷熏蒸、低氧空气或混合气体处理和高温低氧低温冷藏处理等检疫处理,以及性诱剂、苹果蠹蛾颗粒病毒和利用赤眼蜂等田间生物防治措施。苹果蠹蛾的成功入侵与寄主植物的种类有直接的关系,而气候条件则是影响其种群的重要因素。3种检疫处理措施均能安全有效地杀灭水果中苹果蠹蛾的不同虫态,而田间生物防治措施则能有效地控制苹果蠹蛾成虫、卵和幼虫3个重要的虫态,从而降低水果的损失。因此,这些结果为苹果蠹蛾的内外检疫和和田间控制提供了重要的参考。     

蔬菜种子质量控制措施研究

针对蔬菜种子市场存在质量参差不齐的问题,本文从蔬菜新品种的选育与种子生产的研究、良种生产过程控制、采后加工处理、种子质量检测、人员培训和良种推广体系建设几个方面阐述了蔬菜种子质量控制的技术措施。     

8种杀虫制剂对椰心叶甲的防治效果评价

选用8种不同成分且经过室内毒力筛选的化学农药和生化农药单剂进行椰心叶甲[Brontispa longissima (Gestro)]田间防治，运用改进的直筒式手持简易喷雾器（水枪）进行施药，试验结果表明，啶虫脒、吡虫啉、高效氯氰菊酯、甲氰菊酯、丁硫克百威、阿维菌素、喹硫磷和氟虫腈在大田继续保持和室内相同的良好防治效果。施药后第7天、15天、30天和60天害虫虫口减退率和防效均大于99%，第90天和120天个别植株重新感染少量的椰心叶甲成虫和幼虫，第150天后有一半以上的植株感染椰心叶甲成虫和幼虫，其中个别植株已经产生卵和蛹，防效产生轻微下降，但不会对椰树心叶的生长造成实质性的影响。     

激素间相互作用对植物茎伸长生长的调控综述

植物茎的伸长受多种内外因素的调节和控制，其中内部的内源植物激素如赤霉素、生长素等的调控起重要作用，且内源激素不但通过内源激素水平调控，而且还通过激素间的相互作用调节和控制茎的伸长。笔者介绍了各种内源植物激素（如生长素与赤霉素、生长素与油菜素内酯，赤霉素与油菜素内酯，生长素与乙烯等）之间的相互作用调控植物茎的伸长生长的研究概况。     

芦笋十四点负泥虫发生规律与防治技术初探

100029 北京市北三环中路9号 北京市植物保护站     

Utility Analysis of Reclosing in the Distributed Generation System

According to the type of the DG,the working situations of the reclosing are studied.The actual parameters of DG's rated capacity and transient reactance are adopted.According to the location and capacity of the DG, the possibility of auto-reclosing is analyzed,and the parallel feed inverter used in this system and its control method is presented.The system model and calculation results are given in MATLAB.It shows that the auto-reclosing technique is feasible in the distributed generation system and for some DGs connected to the net by inverters,the current instantaneous feedback control can realize the switching condition.     

基于HACCP的浓缩苹果汁生产中嗜酸耐热菌的监测与控制

探讨了浓缩苹果汁生产过程中,HACCP系统对嗜酸耐热菌的监测与控制。根据HACCP系统的原理确定了相应的关键控制点和关键限值,并制定相应的预防措施和控制方法,将生产过程中嗜酸耐热菌的危害降至最小值,以切实保证浓缩苹果汁的产品安全。浓缩苹果汁生产加工的实际表明,通过实施HACCP,浓缩苹果汁中嗜酸耐热菌的数量明显减小,主要工序均能达到理想状态。说明HACCP可以有效控制浓缩苹果汁生产过程中嗜酸耐热菌的污染。     

Research on Cooperative Design Network Security Based on IP-VPN

As the important method and instrument of agile manufacture,the technology of distributed collaborative design and manufacturing has become the hotspot of manufacturing. The basic concept and key technologies of IP_VPN are introduced in this paper,and a collaborative design network model based on IP_VPN is presented. Distributed collaborative design is a multi_user,multitask involved system, which is consisted of lots of collaborative processs,so the network security is the key of distributed collaborative design. We research on the security of collaborative design network based on IP_VPN, hence get a conclusion:we can construct an economical?practical and secure collaborative design network system by the application of data encryption,user authentication and access control based on the role,etc.     

Control Strategy of DO Parameter Based on Human Simulated Intelligence in the Wastewater Treatment Process

The treatment of wastewater is a complicated biological and chemical process, which can not be described precisely with a mathematical model. It is almost impossible to get a satisfactory control result when a traditional PID control method is adopted, for the parameters of the activated-sludge process are uncertain. The paper takes DO parameter controlling as an example, and proposes a human-simulated intelligent control strategy to reduce the fluctuation problem of DO parameter. Both the control rules and the structure of control system are presented. The simulation experiments shows that the control effect of activated-sludge process by HSIC is much better than PID control.     

Distributed Generation of Shared RSA Keys in Mobile Ad Hoc Networks

Mobile Ad hoc NETworks(MANET) is a totally new concept in which mobile nodes are able to communicate together over wireless links in an independent manner,without needing any fixed physical infrastructure and centralized organizational/administrative infrastructure.However,the nature of ad hoc networks makes them very vulnerable to security threats.Generation and distribution of shared keys for CA(Certification Authority)is challenging in security solution based on distributed PKI/CA.Those solutions that have been proposed in the literature and some issues are discussed.This paper propose the solution of distributed generation of shared CA keys based on threshold RSA cryptosystems,with which the security and robustness of system is enhanced.     

HACCP体系在干飘卷生产中的应用

干飘卷是以新鲜元葱、大头菜、鸡胸肉和鸡蛋为主要原料,经过一系列加工制成的冷冻调理食品。运用HACCP原理对干飘卷的生产工艺进行分析,确定了原料验收、漂烫、蒸制和金属探测等4个关键控制点,并对各关键控制点采取了相应的控制措施,从而将产品的潜在危害降低到最低限度,确保产品的安全、卫生和优质。     

Discussion about MIS Development Model

This paper analyzes and summarizes the main problem in developing Management Information System (MIS). On this basis, it presents a new model of MIS development. In this model, the authors emphasize and discuss the importance and conformation of independent system application platform. The final purpose of this model lies in making the users to maintain database, reconstruct application system and develop new application conveniently.     

A Study about How to Appraise the Effect ofInvestment Control by the Supervision at the Construction Stage

Having demonstrated the importance of establishing the appraisal system for the effect of investment control by supervision,this paper designs not only the appraisal model for this problem by citing the basic theories of Analytic Hierarchy Process but also interprets the application conditions and specific approach of the model.Finally,the paper introduces an actual project case by using the model and analyzes the general practical application environment of the model.     

A New Distributed Computing Platform-Jini and Its Application

With the development of network technology distributed computing has become more and more prevalent. Only that kind of distributed platforms which have the attributes of platform independence, dynamic, robustness, security and convenience are what users need. This article mainly discusses a distributed computing platform based on Java Technology--Jini, introduces its advantages compared to traditional distributed systems.Its basic principles and key concepts, system structures, programming patterns and protocols, the services it provides and service procedures are also proposed. In the end a introduction of its application on digital home net is given.     

The Centralize-Distributed Structure Model of Electronic-Business that Based on the Concept of Field-Bus Control System

Electronic business is a model of automation business activities, so the concept of field bus control system that is the latest control technology in automation control domain could be transplanted into electronic business structure to optimize the performance of the electronic business. The author studied the model which had centralize distributed structure and built under the concept of FCS in the environment of electronic business. By analyzing the performance of shops online, authority center and logistics distribution center that have the centralize distributed structure, the conclusions could be drawn that the centralize distributed structure model of electronic business has the advantages of high reliability, rapid response, high expandability, easy to rebuild and high system efficiency that FCS has.     

Simulating Human Intelligent Fuzzy Control to the Throttle Actuator of AMT

This paper discusses the idea and design procedures of applying the fuzzy controller with simulating human intelligent control to throttle actuator of automobile engine of AMT. It is presented that the structure of electronic-controlled hydraulic throttle actuator, the composition of the control system, the control algorithms and the experiment results of the fuzzy controller with simulating human intelligent control. The experiment results and the application show that applying fuzzy controller with simulating human intelligent control to the electronic-controlled hydraulic throttle actuator can ensure the fast response, the stability and the higher control precision and meet the requirements of the actual application.     

国内外现代果蔬物流运输保鲜环境调控系统发展现状及展望

本文综述了国内外现代果蔬物流运输保鲜环境调控系统发展现状,包括温度、湿度、气体和压力四大调控系统,并对今后我国物流运输保鲜发展提出了展望。     

A new control design for grid integration ofDFIG wind farm with VSC-HVDC

This paper proposes a control scheme for a doubly-fed induction generator (DFIG) wind farm with VSC-HVDC grid integration to ensure secure and reliable operation of power system with fluctuated wind power penetration. The whole system dynamic models are respectively described. Based on vector control system with a virtual voltage orientation, a steady-state voltage control block and a dynamic voltage control block with a cross-product term of d-q currents are separately designed for WFVSC to control the corresponding parts of the wind farm voltage. Meanwhile, with the consideration of AC and DC side parameter variation and external disturbance, an improved backstepping control scheme with Lyapunov stability provement is also proposed for the GSVSC. The combination of the two schemes makes up the new control design of this study. Besides, to verify the performance of the proposed new control design, three different cases are suggested which contain the AC and DC side parameter variation and external disturbance such as local load cut off-in, grid voltage harmonics. Finally, numerical simulations using MATLAB/Simulink are presented for a 200MW DFIG wind farm with VSC-HVDC grid integration to validate the proposed control scheme and demonstrate the improved system operation performance. Moreover, the corresponding discussions are also presented for further illustrations.