施药机械药液自动混合控制系统的研究

化学农药在农业生产中有着重要作用,是保证农业生产实现稳产、高产的重要措施之一。目前我国农药大都是采用人工进行配置,存在浪费、农药易失效、不安全等问题,本文通过对电磁阀开关混合控制和电动阀变量控制两种农药混合系统进行比较,电磁阀开关混合控制系统具有混合效果稳定、易操作、结构简单、残留农药易清理等优点,故适合在实际推广中使用。     

The use of microcomputer technology in a modular approach to reading and reading difficulties

This paper outlines the theoretical framework of a two-year two cohort study of inter-related modules to model reading in 300 grades 4, 5 and 6 readers, and describes the specially designed microcomputer programs written in Turbo Pascal to implement this modular approach. In brief, the modular approach postulates the interrelated phonological, morphological modules in processing words and sentence/paragraph processing. These three modules or components are subserved by 10 measurable tasks all implemented on the microcomputer (IBM-PC compatible) with reaction time measures as indices of the different facets of verbal efficiency. Statistical analyses of the large data sets for Phase 1 show the linear structural equation modelling fits the data reasonably well. In particular, the morphology task consistently explains between 32% to 44% of the variance in reading performance in the three grades. The findings lend themselves to specific approaches to habilitation in the different components or sub-components.This study was supported by a grant (No. 410-86-0048) from the Social Sciences and Humanities Research Council of Canada awarded to Che Kan Leong. Simon Lock and Jacky Lau were responsible for the microcompurter programming. Edward Danskin, Melvin Kelley, Donald Simmons, Louise Sellinger, Kristin Strauss and Tara Wiley carried out the experimentation with individual children in the schools. The cooperation of the principals, the teachers and the subjects was greatly appreciated. Requests for reprints should be addressed to Dr. C. K. Leong, Department for the Education of Exceptional children, University of Saskatchewan, Saskatoon, Canada, S7N OWO.     

Mapware: Educational applications of geographic information systems

An emerging technology, geographic information systems, is analyzed in terms of its applicability to mathematics and science education. Examples of possible applications are given, a research agenda is sketched out, and needed characteristics of the software when applied to education are described.     

The systematic measurement of the perceived characteristics of information technologies I: Microcomputers as innovations

This study reports the results of the development of a test designed to measure the perceived characteristics of microcomputers as innovations. A three factor solution was obtained, with factors measuring complexity, compatibility, and trialability/observability. No factors emerged measuring relative advantage or perceived expense. All of the defined factors had acceptable levels of reliability and validity checks confirmed that the developed scales had construct validity. Issues relating to future research, model and theory building in the diffusion process, and longitudinal studies were discussed.     

Switching from computer to microcomputer architecture education

In the last decades, the technological and scientific evolution of the computing discipline has been widely affecting research in software engineering education, which nowadays advocates more enlightened and liberal ideas. This article reviews cross-disciplinary research on a computer architecture class in consideration of its switching to microcomputer architecture. The authors present their strategies towards a successful crossing of boundaries between engineering disciplines. This communication aims at providing a different aspect on professional courses that are, nowadays, addressed at the expense of traditional courses.     

数据采集与处理系统

本文阐述了如何利用微型计算机进行数据采集和处理,并对于采集速率要求较高的,提出了采用多微型计算机并行执行数据采集和处理的系统结构。     

微型计算机认知实验平台设计

随着计算机技术的飞速发展及普及,社会迫切需要理论联系实际的应用型人才。针对目前学生动手能力普遍偏弱的特点,通过计算机认知实验平台提供的全透明、结构化、模块化组件,让学生看到计算机内部的结构,让学生能动手组建自己的计算机系统及组建自己的局域网络,从而提高学生对计算机内部结构的感性认知,增强学生实际动手操作能力。     

单片机系统与标准PC键盘的接口模块设计

给出了一种单片机系统与标准PC键盘的接口模块.介绍了测取键盘串行数据具体情况的方法,分 析了接口模块的工作原理与软件编程思想.采用该设计可以简化键盘电路及程序的设计,而且具有通用性.     

Technological Change and Employment. A Report to the Prime Minister by ASTEC,prepared by the Technological Change Committee (AGPS,Canberra, 1983) pp. 168, ISBN: 0-644-02657-X

In this paper we present the results of a survey designed to collect information on the use of microcomputers and attitudes towards them. The survey was conducted by mail in the north-eastern part of New South Wales and based on a mailing list used by the Department of Continuing Education at the University of New England for courses related to computers. It suggested that microcomputer use is largely related to business applications and not to personal income levels. A surprising degree of satisfaction with the systems was observed.