滴定量热系统的自动化研究

针对采用传统滴定量热计和使用手工记录实验数据存在处理不方便及精度难以保证等问题,基于热化学理论与自动化控制原理,研究设计了计算机监控滴定量热计量热系统,实现了量热实验数据采集和处理的自动化;并利用该系统测定了铜与氨基酸的一级配位反应,在数据采集结果准确度与精密度方面取得了满意的效果.该系统不仅适用于热力学系统研究,也适用于动力学研究,对现代滴定量热分析仪器的设计及改进具有一定参考价值.     

由滴定量热仪数据计算质子化反应热力学函数的通用程序

本文对水相中弱酸根或弱碱的质子化反应提出了由微机控制的滴定量热仪的实验数据计算其各热力学函数及有关信息的通用计算机拟合程序,其中采用了收敛速度较快的阻尼最小二乘法的参数优化算法,使拟合速度比采用正单纯型法拟合约快十倍。     

在热脱附实验中用微机控制四极质谱仪大规模地探测反应产物

本文介绍如何把微机和常规的四极质谱仪联机组成一系统,用该系统来收集和监察大规模质量的质谱数据(>150个质量数),并可以消除在监察过程中忽略一个或多个反应产物的可能性。这种大规模质量扫描系统对于脱附产物可以提供有用的定性讯息,而常规质谱数据采集方法还是必须的,它可提供高精度的定量数据。     

微机与多台智能流量仪表通讯软件的设计

1程序设计思想 在利用8098单片机设计智能流量仪表时,我们设计了通讯管理系统,来适应现代化管理的需要.实现一台微机对多台智能流量仪表的工况参数、时钟参数、定量打印时间参数进行重新设置和修改,并可随时检查、查看各个智能流量仪表的工作状态,各种参数及累积流量.智能流量仪表完成数据采集及数据计算处理,微机进行管理和控制.本文介绍微机与智能流量仪表通讯软件的设计.     

微型计算机温室环境监控管理系统

微型计算机温室环境监控管理系统采用了传感器技术,测控技术以及微机技术实现温室的管理自动化和科学化,它由单片机和系统微机组成,单片机把传感器采集的与生物有关的参量,例如,温度、湿度、光照以及CO_2等转换的电压数据进行存储与预处理,并通过总线同系统微机相联。系统机完成数据群处理,历史资料统计分析,控制管理,并对数据进行显示、编辑、存储、打印输出等。此系统还可以扩展用于其它领域完成数据采集与调控。     

微型计算机温室环境监控管理系统

微型计算机温室环境监控管理系统采用了传感器技术,测控技术以及微机技术.它由单片机和系统微机组成.单片机把传感器采集的与生物有关的参量,例如,温度、湿度、光照以及CO_2等转换为电压数据进行存储与预处理,并通过总线同系统微机相联.系统机完成数据群处理、历史资料统计分析、控制管理,并对数据进行显示、编辑、存储、打印输出等.此系统还可以扩展用于其它领域完成数据采集与调控.     

基于△-∑技术和FPGA的数据采集系统

为了改善传统数据采集系统运算能力差、分辨率低、可靠性低等缺点,结合△-∑技术和FPGA,设计了一种多通道、高分辨率、宽动态范围的新型数据采集系统.提出了一种由△-∑A/D转换芯片、高性能FPGA和DSP组成的数据采集系统方案及其硬件电路实现方法.系统利用A/D器件对信号进行滤波、放大、差分转换和模数转换,利用FPGA设计内部模块和时钟信号进行电路控制及实现数据缓存、数据传递等功能,由高速DSP芯片核心控制,对采样数据进行实时处理.系统能实现24位高分辨率、宽动态范围的信号数据采集与高速实时处理,可用于电压、电流、温度等参量的采集系统中.     

“数据采集系统及其应用”讲座：第八讲 采集系统与计算机接口技术（二）

四、单片机8031控制的 智能型数据采集 随着智能仪表的发展,用单片机构成多路数据采集已经普及,它不仅采集数据而且还能对采集到的模拟信号进行数据处理,例如实现工程量的转换、非线性的处理、热电偶温度补偿等。用了单片机就能独立构成一智能仪表,进行实时测量和数据处理。     

一种基于交互式数据迁移技术的数据采集方法

针对计算机审计的现状，阐述了数据采集在计算机审计中的重要性。在分析了数据采集和数据迁移技术的基础上，提出了一种基于交互式数据迁移技术的数据采集方法。该方法不仅可灵括、准确地完成数据采集，还同时完成了数据的清理工作。最后，总结了该方法的优点，它为开展计算机审计提供了一种有效的数据采集方法。     

基于ADS1210的分布式高精度数据采集系统

介绍了基于ADS1210的远程高精度数据采集节点的设计方法。该节点以PIC单片微机为控制核心,实现对模拟信号的精确转换和利用CAN总线技术进行远程数据传送;阐述了远程数据采集系统的网络结构原理,给出了分布式数据采集节点的硬件电路、软件设计方法和程序流程图。     

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.     

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.     

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。     

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