基于GIS的农业经济信息服务系统的设计与实现

针对现有农业经济信息服务系统的缺陷,提出了结合地理信息系统技术的改造方案。以组件式GIS软件Supermap Objects为开发平台,C#.Net为语言环境,采用面向对象和组件式开发技术,设计和开发了农业经济信息服务GIS系统,并建立了农业经济基础信息空间与属性数据库。新的系统实现了农业经济信息数据的空间查询和空间分析,为各级农业部门提供辅助决策手段和辅助分析依据,提高了农业经济信息服务的水平。文章详细阐述了系统的体系结构、功能模块和在C#.Net中使用Supermap Objects组件对象进行地理信息系统开发的基本过程。     

The Analysis of Abnormal State for Power Distribution Network Based on MATLAB

Along with the extensive use of power cable lines in power distribution system, the probability of fundamental frequency resonance has greatly increased. It may endanger the security operation and power supply reliability of the power system. On the basis of theoretical analysis and numerical calculations using MATLAB language combined with a real instance, it is indicated that the improper electrical parameter coordination caused by the abundance of power cable lines result in fundamental frequency current resonance, in addition, the countermeasures based on SVC to solve the problem are put forward. Further more, digital simulations have been carried out in detail based on the dynamic simulation model developed by the application of MATLAB/Simulink and its power system simulation software. Simulation results proves the effectiveness and practicability of the scheme presented.     

Application of Web Server in Remote and Intelligent On-line Diagnoses System for Rotational Machinery

Web Server is a software technology and communication method to carry out information issuance. The new concept of combination of equipment faults diagnoses with Web Services technology is proposed. The techniques flow of equipment, techniques parameters, signal characteristics and inference resolution in faults diagnoses are put forward with communication and software in order to carry out data dynamical exchange and interface of HMI. The remote processing on network of system information issuance is formed in this way. The principle and characteristics of Web Server technology are introduced. The common contents of information issuance in on line diagnoses system is also classified. The Web Server is applied in the project for high technology research work (863 project) "Remote and Intelligent On-line Diagnoses System for Rotational Machinery" to realize the function of information issuance and data inquire by groupware of DELPHI 6 Web Services.     

Object-oriented FEM Program for Three-dimensional Convection Diffusion Problems

According to an analysis of three-dimensional convection diffusion problems and object-oriented programming method,the classes of finite element models for convection diffusion problems are designed in C++.There are vector classes,matrix classes,element classes,material classes and method classes of finite element among these classes.On the basis of these classes,an object-oriented finite element program for three-dimensional convection diffusion problems is accomplished,which is able to simulate similar problems.The program's reuse,maintenance expansion and integration with other ones are easier than traditional ones which are designed with structural language,it can be applied to a large universal computational software for science and engineering.     

Design of Information Terminal in the Water Supply Industry

A information terminal is designed , which is applied to administration and service management in the water supply industry of city. The situation of administration, service management and demand of reform about tradition technology are researched. Combining the advantages of information-processing and movable operation of the pocket PC, a communication model of terminal which can collect data in the field and a processing software are developed . It has the characteristics such as acquisitioning data , service , management, movable operation to traditional water meters, smart card water meters and remote water meters. It has been applied to housing estate and water supply industry at present ,with the widely used ,it improves the situation of management in the water supply .     

Research and development of the real time remote monitoring control system of hybrid electric vehicles

This paper develops a vehicle carried remote data acquisition terminal based on GPS/GPRS integrated DTU(data transfer unit) and CAN Bus data acquisition module, and built a parameter remote monitoring system of HEV with GPRS and Internet. By using PIC18F4580 with built in CAN control module and industrial DTU MD610G, we transmitted the parameter data and GPS information of the HEV(Hybrid Electric Vehicle) terminals to the remote data control center through GPRS(General Packet Radio Service) and INTERNET. Taking VC++ as the development tool, we programmed a monitoring software of data exchanging, data processing and monitoring. The software also has the function of CANoe data playbacking and strengthened the system versatility. Eventually, the parameter remote monitoring system of HEV is developed. The experiment results show that the system works well.     

Nonlinear Characteristic Modeling of Servo Value on Hydraulic Bending Roll System''s Dynamic Characteristic

Nonlinear characteristic of servo value is the important factor influencing hydraulic system, the model of electro-hydraulic servo pressure control system is designed. In this model, flux-equation of servo valve is specially applied and some non-linear characteristics are considered. Furthermore, SIMULINK toolbox of MATLAB language software is applied to solve mathematic model and simulation curves of some variables are obtained. The calculation results are in good agreement with the experimental results.     

Design of GIS-based monitoring and maintenance decision support system for urban sewage pipe network

Monitoring and maintenance of sewer system is important to city water environmental management. A method for pipeline monitoring and maintenance decision support system (PMMDSS) based on geologic information system (GIS) and decision making system (DSS) is developed for upgrading sewer system maintaining efficiency. Visual basic (VB) and standardized Active X components are employed in PMMDSS, which selected SuperMap Objects as the development platform. PMMDSS integrates the spatial and model system to achieve the decision analysis for the sewer system monitoring and maintenance. An application Software is developed based on a case study in Yuechi Country of Sichuan Province. The software can be used to dynamically monitor the heath condition and provide an optimum visual decision making platform for the city sewer system.     

农业大棚温度自动记录仪设计

为了便于实时监控农业大棚温度的变化,设计了测定农业大棚小环境的温度自动记录仪。该记录仪采用数字温度传感器、单片机、显示器和I2C器件。软件设计主要包括：温度信号的采集、温度数据的储存与读取、汉字与采集结果的混合显示3个模块;通过对系统的设计进行Proteus仿真,结果表明系统的软硬件设计正确。     

滨海盐土棉田棉花水、盐遥感监测系统的设计与实现

 为监测滨海盐土棉田棉花的水、盐状况,对盐碱地植棉提供理论依据。本研究运用软件工程的思维,耦合了基于地面遥感手段构建的棉花功能叶水、盐状况监测模型和土壤介电常数模型,开发了具有监测滨海盐土棉田棉花和土壤水、盐状况功能的遥感监测系统。系统以光谱反射率和土壤介电常数数据为基本输入,对棉花功能叶和棉田土壤水、盐状况进行了预测计算,运行结果以表格和图形的形式输出。应用结果表明,该系统操作简单、运行稳定,监测结果准确,可为农业生产者、管理人员和科技人员提供棉作数字化和科学化的决策支持。     

Application of Object-oriented FEM in Developing Simulation Software System

Based on object-oriented method, the classes of object-oriented finite element are defined. The finite element program of static, dynamic characteristics and stability analyses for spatial frame structures is developed with c++ object_oriented language which is successfully incorporated into a computer simulation system of derricks. The results of static, dynamic characteristics and stability analysis for the derricks of F320-A and JJ250/42-K types, obtained with the developed system, are consistent with those obtained by a commercial software, which illustrates the correctness of object-oriented FEM and the reliability of the simulation software.     

Development of Virtual Sweep Signal Source

A new kind of virtual sweep signal source which can be used to output specific sweep signal according to(users') configuration and can be widely applied to frequency characteristics measurement in the field of mechanics,electrics and electronics,is developed by using Dot Net software engineering technique,C/S architecture and general data acquisition platform.The virtual instruments not only make up the intrinsic defect of traditional instruments based on hardware components in high performance,remote control and data processing,but also indicate the powerful life and nice future of virtual instrument technologies.     

The Numerical Simulation Commercial Software for Secondary Cooling Process in Billet Continuous Casting

A numerical simulation commercial software has been developed by the object-oriented Visual Basic programming language on the basis of the 2D mathematical model of secondary cooling Process in billet continuous casting. Thereby an effective experimenting tool for computer simulation of continuous casting process is gained. By simulation with the software, the caster structures and operating parameters in continuous casting can be designed and optimized. The simulating calculation examples on several casters and its production applications indicate that the commercial software developed has more accuracy, practicability and commonality, as also as simpler operating capability. The simulated results have been successfully applied to the design and production of the high-efficiency modification for several billet casters interiorly.     

Application on Extracting Feature in State Monitoring and Fault Diagnosis

With the development and application of information and internet and virtual instrument technology ,the virtual globular company based on internet arises .To study remote state monitoring, remote fault detection and diagnosis about large scale, complicated and integrative equipment become very important. In the whole fault diagnosis system , the detecting ,data acquisition is original ,processing; transform and extracting features with the signal detected is a key factor. The theories and methods used in mechanical fault diagnosis is stated. The application of signal process and its feature extracting methods is introduced which are time domain, frequency domain and time frequency domain analysis, in state monitoring and fault diagnosis with its signal analysis. The processing method of random time variant special signal is given also.     

Modeling and Simulation for 440 t/h CFB Boiler Steam/Water System

Dynamic mathematical model,which is based on the character of power-plant boiler system,is established by the means of modularization. On the basis of dynamic mathematical models,simulation model of the object is created with the advanced continuous simulation language(ACSL).The validity of this model has been verified by the simulation experiments and analysis.The simulation model helps to evaluate the influences that the dynamic process in steam/water's side brings to the boiler's operation and have some directive significance to design method of boiler and optimize run.     

玉米低温冷害远程诊断管理系统的设计

夏季低温冷害是中国低温灾害的主要类型之一,尤其在东北地区发生比较频繁,造成影响相当严重,基于此,笔者旨在为玉米低温冷害设计一个基于网络的远程诊断与管理的系统平台。通过对基于web的远程诊断管理系统关键技术的分析,在总结东北地区玉米低温冷害领域专家经验和知识的基础上,初步实现了一个基于web技术的玉米低温冷害远程诊断与管理系统。该系统采用J2EE技术规范和Java语言进行开发,并且与无线远程监测系统相结合,使之具有实时管理功能。用户可以通过访问该系统,实现玉米低温冷害主动和被动防御、低温冷害实时监控管理、专家知识浏览和系统维护等功能。该系统具有可靠性、易维护、易操作和普适性等性能,并可通过重建知识库和数据库,为更多种类作物气象灾害提供远程诊断及管理服务。     

基于无人机RGB遥感的甘蔗株高估测

为快速准确地估测甘蔗不同生育期株高，探讨了无人机RGB系统遥感估算株高的可行性及效果。利用无人机RGB遥感平台，获取苗期、分蘖期、伸长中、后期和工艺成熟期的影像，通过Pix4D mapper生成数字表面模型（digital surface model,DSM），采用Eris Arcmap提取株高，基于DSM提取的株高与实测株高建立各生育期的估测模型，采用决定系数（R2）、均方根误差（RMSE）和平均相对误差（MRE）对模型进行评价。结果表明，基于DSM提取甘蔗各生育期的株高高于实测株高；全生育期模型拟合性最好，预测精度较高（验证集R2、RMSE和MRE分别为0.9611、0.1623和0.1102），苗期株高模型预测精度最高。其他各生育期模型的拟合性不及全生育期和苗期，精度较低，工艺成熟期模型的预测精度最低，拟合性最差。因此，基于无人机RGB遥感平台获取甘蔗不同生育期影像后通过DSM提取株高并运用于甘蔗重要生育期株高的估测时，注意不同生育期模型的适用性。     

Design and Realization on Remote Condition Monitoring System for Feeding Oil Pump

In view of the actuality of the feeding oil pum monitoring,the network technology,the database technology and the Dot Net remote technology are integrated nimbly to construct the remote condition monitoring system for feeding oil pump,which has many functions such as the real-time data monitoring and alarm,real-time monitor data storage remote monitoring,network data sharing,fault analysis,and so on.The whole construction design of the system and the realization of its sub function are given.The worker's intensity of labor,the maintenance cost and the accident occurrence rate of the feeding oil pum were dramatically reduced when the system was applied to the oil storeroom successfully.     

GPS Information Obtaining in uClinux Embed System

Data receiving system of GPS system based on Linux was completed. The embedded MCF5272 system, M12 and G18 modules were used in the application based on uClinux. Taken MCF5272 as core, satellite position data were obtained through GPS(Global Positing System)module M12,and uClinux operation system was used in the system for controlling. By G18 module, the GPS data can be transmitted to wireless mobile network linked to Internet and received by remote server, which had been linked to Internet also. The constitution of embedded system is gived and the principle of GPS is introduced. The soft for GPS receiving is realized in uClinux system with C language, and the test data are gived in the end. The resolution of the system is that latitude and longitude: 1 milliarcsecond, height: 0.01 m, velocity: 0. 01 m/s.     

Data Collection and Control Discuss of GPS Technique and Its Application in Landslides Monitoring

Water level has risen considerably since the impounding of the Three-Gorges Reservoir in year 2003 and that might cause serious geologic hazards, including landslides. Primarily using GPS technique, the landslides wireless monitoring in the Three-Gorges Reservoir is developed in rapidnly. To collect data and monitor in engineering more rational, the system model of GPS technique and its application in landslides monitoring are analyzed. Focusing on the data collection in monitoring, the authors discuss the method of embedding control in the monitoring model. By connecting the character of the monitoring system and landslides, the control signal is produced. At last, the experiment is performed with analogy software in monitoring system including control. The experiment indicates that the control signal is reasonable and valid. In actual engineering, this method is made progress.