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．     

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。     

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。     

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。     

谷物均匀受热烘干箱控制系统的设计

随着谷物烘干工业的不断发展,对谷物烘干过程中的自动化控制和加工质量要求也越来越高。为了使谷物在烘干过程中能够均匀受热,避免因烘干不均导致谷物品质下降的问题,设计了一种基于PLC的谷物均匀受热烘干箱。该系统主要采用了西门子S7-200系列PLC作为控制器,结合STEP7编程软件进行程序设计和调试。实现快速、准确地检测并控制谷物的温度,使谷物烘干时达到均匀受热的效果,能够有效地提高谷物品质和经济效益。该设计还具有控制能力强、可靠性高等优点,具有应用前景和推广价值。     

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。     

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 …     

试论粮食经济面临的问题与建议

为保证国家粮食安全，增加农民收入，维护全国粮食供求平衡，加快粮食流通市场化改革，本文探讨了粮食经济面临的主要问题，提出相应建议，对发展国家经济和振兴粮食产业具有重要意义。     

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。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.