烘干塔中粮食温度-含水量测量系统设计

粮食在储存之前,需要在烘干塔中利用热风降低粮食的含水量,使其控制在特定范围之内。为了检测烘干中粮食的温度及含水量,设计了以STC89C52芯片为核心的温度-含水量检测系统,DHT21数字传感器采集湿度信号,DS18B20数字传感器采集温度信号,由显示器LCD1602显示温度值和含水量值。当温度或含水量超过设定的安全范围时,系统由蜂鸣器发出报警信号,启动风扇工作进行降温。用Proteus仿真软件对系统进行了仿真,并验证了测量系统的正确性。     

粮食烘干塔的大惰性微机控制系统

烘干培是粮食仓储系统的重要装置．过去的烘干塔均由手动控制，调节不够准确，温度控制不稳定，很难保证成品粮的水份达到规定标准．采用微机控制系统可使粮食供于加工的质量和产量得到显著提高．本文介绍粮食烘干塔微机控制系统的硬件配量及软件流程．     

高频介质加热在粮食烘干中的应用

一、前言粮食烘干是粮食贮保工作中的重要一环。现有的烘干方法,无论是在烘干速度上,还是在烘干后的粮食质量上,以及在烘干粮食的品种等几个方面,都远远不能适应农业不断发展和粮食年年增产的需要。因此,探讨新的烘干方法就成为一项具有政治意义的科研任务。为了落实毛主席提出的“备战、备荒、为人民”的伟大号召,几年来,广大工人、干部、技术人员发扬了艰苦奋斗、自力更生、勇于革命的精神,在粮食贮存工作中不断进行革新,不断进行革命。高频烘干粮食试验就是在这种大好形势下进行的。它为提高粮食烘干速度和质量,减少污染,消灭害虫提     

粮食烘干塔水分在线检测系统中的实时信息采集与处理

通过对粮食烘干塔水分在线检测系统的实时性要求分析,介绍了在VB程序中实现信息实时传输和处理的多线程编程方法,论述了串行通信、动态图形显示,温度补偿和数据融合等实时信息处理方法。     

基于数据仓库的粮食预测系统

设计并实现了基于数据仓库的粮食预测系统。利用数据仓库的特点，通过预测主题的层次结构和预测实例的多维模型，实现了对预测内容的灵活控制和多预测方法选择，针对现有预测系统专业性强，操作复杂的特点，实现了易理解、易使用的目标。系统已应用于粮食智能决策支持系统，为领导决策提供参考依据。     

粮食贮运加工过程中的防爆装置

粮食贮运加工过程中,随着烘干仓内温度程式高,粉尘浓度及压力的增大,很容易发生爆炸,而传输机构打滑产生的高温和火花是引起爆炸的主要原因,为避免打滑引起的粉法爆炸,介绍一种新型防爆检测装置,即差速检测器。     

基于决策树分类方法的粮食轮换决策支持系统

粮食轮换决策一直是困扰国家粮食存储企业的难题。粮食管理信息系统多年的成功应用，积累了大量的粮食数据信息。粮食轮换决策支持系统基于数据挖掘中的决策树分类方法，在大量的粮食轮换样本数据的基础上，发掘粮食轮换的决策知识，并利用这些知识指导粮食轮换决策。该系统运行稳定，已成功试运行于某地区的粮食管理部门和企业，并明显改善了其粮食轮换决策的效能。     

大型粮食中转仓库自动控制系统

1　概述　　本文介绍的粮食中转库是国家级大型粮食中转仓库 ,共有储粮筒仓 32个。粮食进出有 3个途径 :汽车、火车和轮船。设计粮食进出流量为 2 50ｔ/ｈ ,系统配备2台进口计量秤 ,对进出粮食进行计量。控制系统的任务是完成对粮食进、出的自动化控制 ,并为信息系统提供粮食进出原始数据信息。2　系统总体方案设计系统总体方案如图 1所示。监控计算机采用工业控制计算机 ,2台工业控制计算机经以太网与服务器相连 ;工业控制计算机与ＰＬＣ通过ＡＢ公司的ＤＨ 网相连 ;计量秤通过ＲＳ - 4 2 2 /4 85接口与工业控制计算机连接 ;信息系统部分 …     

基于80C196KC的粮食烘干塔水分在线检测系统

提出了一种基于 80C196KC单片机的粮食烘干塔水分在线检测系统 ,介绍了系统的工作原理、硬件构成和软件设计。系统以80C196KC单片机为信息处理核心 ,采用大屏幕中文液晶显示。实际运行表明 ,系统具有信号传输距离远、测量准确度高、运行可靠、智能化程度高等特点。     

基于改进神经网络的粮食配送中心选址决策研究*

粮食配送中心选址问题是构建现代化粮食物流系统的重要研究方向。从粮食配送中心选址的影响因素出发,建立了以控制成本为核心的数学模型,引入了经遗传算法改进的人工神经网络模型进行求解,并且给出了详细的设计步骤。为解决遗传算法易陷入局部最优的问题,提出了一种在变异算子中增加禁忌搜索的方法。实验证明,该方法在解决粮食配送中心的选址决策时,效果较好。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

正~~