基于PLC的锅炉补水泵控制系统研究

设计了一套水暖锅炉自动调温系统应用于农业生产,主要部件包括主机、辅机、控制系统和水暖管道装置等。基于PLC的锅炉补水泵控制系统能够对整个锅炉的运行状况进行监测、报警、控制,保证锅炉正常、可靠地运行。该设计克服了以往养殖水暖锅炉中存在的缺陷,可以保证锅炉补水泵控制系统稳定可靠工作。     

Site Environment Management for Construction Firms

Construction site is noted for its dense population, high mobility of construction workers, hard working and poor living conditions. Therefore, during the SARS spreading period, the local government put the construction site into the strictly control list in view of the outbreak of SARS. Some contractors were punished because of their poor measures taken for controlling the SARS. Under the SARS attack, for the construction firm, it is necessary to have good site environment control. The environment benefit and economical benefit due to site environment management have been elaborated in this paper. The legal duty of the contractor is also explored in view of related laws and regulations. The management framework and site environment practice are discussed in detail.     

地方院校食品质量与安全专业特色化建设探讨

特色化发展是地方院校食品质量与安全专业建设的必然选择。地方院校应努力构建有利于可持续发展的食品质量与安全专业特色化建设机制,即:准确定位是基础,创新人才培养模式是核心,搭建特色化的实践教学平台和组建特色化的教学科研团队是保障。     

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.     

Simulation Modeling and Simulation Analysis for the Boiler Attached to 360 MW Unit

Using modular simulation technique,a mathematical model for the combustion and air/gas system of the W shape flame boiler is presented.The experimental resulats show that.The dynamic process accords with the mechanism process of the object.     

Load Forecasting Based on BP ANN for Economical Operation of Electric Boiler with Heat Reservoir Under Time-sharing price

Along with the generalization of DSM and time-sharing price system, the use of electric boiler with heat reservoir becomes more and more extensive. Load forecasting of heat supply system is an important base in the study of economical operation of electric boiler with heat reservoir under time-sharing price. The BP ANN modeling of the load forecasting for a 1200 kW electric boiler is discussed. The result of hourly heat load forecasting accords well with the real heat load.     

主成分分析法在李果实贮藏特性分析中的应用

本文利用主成分分析法,对李果实采后贮藏过程中八个指标的变化进行统计分析。结果表明：原始的指标可划分为四个主成分因子。第一、二、三和四主成分因子的贡献率分别为52.774%、23.154%、15.025%、7.987%,累计贡献率为98.941%。构建的综合评价模型表明,贮藏0d至4d期间,李果实进行的是后熟过程,这一期间果实的品质较好;贮藏4d至10d,果实进入衰老阶段,至贮藏10d时,果实失去价值。     

Solving the Operation Directing Expert Systems Based on Characteristic Model

In this thesis,aiming at the characteristic of operation directing expert systems,we use the state of process characteristic parameter to describe the process condition(state).We propose a solving strategy batal on characteristic model.According to the solving-tree of process condition (state),the present process state can be obtained. An example of application illustrates that this method solves problem quickly and satisfy the real time directing operation.     

Study on the Mechanic Product Parallel Design System Based on Characteristic Technology

In this paper ,the parallel design method and its property are discussed,a parallel design system structure based on characteristic technology is presented,and a valve parallel system is developed,and it successfully works in a factory.     

“双一流”背景下高校优势特色学科建设路径

当中国特色社会主义进入新时代,大力发展高等教育是建设教育强国的必然要求。建设双一流,是党中央、国务院做出的重大战略决策,也是中国高等教育领域继211工程985工程之后的又一国家战略,有利于提升中国高等教育综合实力和国际竞争力。地方高校需要响应决策、抓住机遇,积极应对在拥有大批优势学科等挑战的情况下,设立发展优势特色学科,探索其相应的建设路径。     

基于SWOT分析的新疆特色农产品营销对策探析

依托新疆特有的农业生产资源,发展优势特色农产品,开展特色农产品的营销是实现特色优势资源转换,传统农业向现代农业转型和提高农民收入的重要途径。利用SWOT分析对新疆特色农产品营销环境的优势、劣势、机遇和威胁进行了分析。综合各种有利和不利的因素,提出了新疆应抓住中央援疆机遇和区位优势开拓国内外市场,加强品牌建设、文化营销和绿色营销,加强农业信息建设,提高农产品精深加工能力,提高农产品质量和安全,加强标准准化生产和三品认证等对策建议。     

Innovation of Construction Projects Management Based on the Five-dimension Modeling

Nowadays,the computer technology is applied more and more widely in the architecture,engineering and construction industries(AEC).This paper introduces a methodology of construction project management based on the five-dimension modeling which integrates three-dimension building models,resources and schedules by the development of virtual construction technology.The application of this method also influences several aspects of project management such as range,time,cost,resource,communication and information management.Finally,the process of 5D modeling and the management practice are presented through a real life case in Beijing which proves to be a more efficient,productive and economy project.     

Real time Defining Method & Algorithm of the Characteristic Values of a System

Defining of the characteristic values in a system property curve is the key to judge the run state of the system .It is very important to differentiate its characteristic values dynamically and real timely. According to the projecting geometrical feature of the characteristic values in the system property curve,the on line analysis method with simple algorithm and high accuracy to analyze and define these characteristic values is presented, and the run state of the system is determined.     

Elementary Analysis on System Outlook of the Construction Supervision

This paper explains simply some system connotations on engineering project and probes into the system characteristics of the construction supervision. It dissects some basic system problems and provides references to help the engineers with setting up the system outlook, organizing construction supervision for large-scale and modern engineering project.     

离交法提取柠檬酸所用离交柱结构改进及操作参数的优化

通过对单室和双室离交柱吸附柠檬酸运行效果的对比,确定采用双室固定床离交柱,并对其结构进行了改进,同时优化了树脂填装高度和流体流速等。通过测量单室不同高度时树脂膨胀所引起的阻力,得出最佳高径比为2∶1。对比相同树脂高度时的双室和单室树脂膨胀所引起的阻力,说明采用双室可以明显减小树脂膨胀所引起的阻力,下室最佳高径比为2∶1,上室为1.2∶1,最佳流体流速为4倍树脂体积/h,树脂的膨胀率约为10%。     

Study on the Construction Quality Assessment System

A model of "construction quality assessment space" is designed in this paper,which illustrates construction quality assessment in three aspects as construction types,phases and characteristics.Based on this model,the construction quality assessment system(CQAS) is structured.As a part,the construction quality index(CQI) can be used for evaluating the Chinese construction quality status;and some technical methods such as spot checks and analytic hierarchy process can be used for getting macro and micro construction quality assessment results.