论数字参考咨询服务中利用镜像站点进行原文传递的侵权问题

就数字参考咨询服务中利用镜像站点进行原文传递的侵权问题进行了探讨,提出了利用镜像站点进行原文传递对数据提供商的权益侵害和对著作权人的信息网络传播权侵犯的观点。     

江苏外向农业发展的现状及对策

外向农业是现代农业的重要内涵,发展外向农业是江苏实现农业现代化的重要突破口.入世以来,江苏省委、省政府高度重视外向农业的发展,先后出台了加快发展外向型农业的政策和措施,并采取一系列步骤加以推进,确保江苏省外向农业取得较快发展,并逐步跃进全国先进行列,农业国际竞争力得到日益提升.然而,如何在建设现代农业中更好地发挥外向农业的作用,这是每一个外向农业工作者必须思考的课题.本文分析了江苏农业利用外资、农产品出口、农业对外经济技术合作以及农业对外交流等现状,研究了近5年江苏外向农业发展较快的内外因素,比较了江苏省与发达国家或地区以及山东、广东和浙江等省的差距及其原因,并就发展中存在的主要问题提出了对策建议.     

我国现代农业育种工程市场化的现状分析

从阐述我国农业育种工程市场化的必要性入手,对农业育种工程市场化对育种工作的积极性影响进行系统地分析与论证,并在此基础上,就如何实现农业育种工程市场化提出了一些具体的建议。     

2F-12型变量施肥试验台试验

为了提高化肥的利用率,达到提高产量减少污染的目的,以黑龙江垦区施肥机械为基础,设计了一台2F-1 2型变量施肥试验台。变量施肥试验台的目的是研究降低施肥成本的方法和途径,提高农业生产的经济效益和环境效益,简化施肥操作步骤,降低劳动强度,在提高变量施肥控制系统的开发设计能力的同时,为田间变量施肥机具的大面积推广提供技术储备。2F-12型变量施肥试验台可以完成变量施肥软件的测试和变量施肥的监测工作,主要由箱体、排肥装置、液压系统、电控系统、车载计算机,以及施肥监测系统组成。测试试验结果表明:变量施肥软件无误,施肥口输出肥料正常,机具设计结构合理,可为黑龙江垦区变量施肥作业提供技术支持。     

圆弧插补对数算法及误差分析

提出了一种采用对数算法的圆弧插补方法，并对插补误差进行了分析，插补软件利用ＭＣＳ－５１汇编语言编制。     

简析我国农用三轮车产业现状

对我国农用三轮车产业发展阶段及产业特征进行分析,用数据说明了该产业的市场分布状况;同时对农用三轮车消费人群的消费心理、消费习惯进行深入分析,最后指出国家政策法规对农用三轮车产业发展的制约和影响。     

DIGITAL POWER SYSTEM STABILIZER ( DPSS )

A digital power system stabilizer ( DPSS ) and its design method are presented in this paper. The mathematical model of a single machine infinite bus power system is obtained using off-line parameter identifications, and on the base of the identified model the control system is synthesized by generalized minimum variance control principles. Through feedback combination of several signals this control system has double functions of damping low frequency oscillation and automatic voltage regulating. In order to avoid static errors the very effective way is to combine discrete generalized minimum variance control with continuous integral control. Besides the proposed control strategy is very simple in structures and very easy to realize. Simulation results under several cases have shown the correctness and effectiveness of the proposed control strategy.     

农用柴油机低温起动性能初探

论述了农用柴油机低温起动时存在的问题，并且介绍使用进气歧管空气加热器后改进起动性能的效果以及使用中应注意的问题     

Direct and indirect impacts of integrated pest management on pesticide use: a case of rice agriculture in Java, Indonesia

BACKGROUND: Integrated pest management (IPM) technology has been disseminated since 1989 in Indonesia to cut down pesticide use, but the adoption and diffusion of the technology are still debated. This study aims to estimate the models of demand for pesticides and to analyse the impact of IPM technology on pesticide use. Aggregate cross-section time series data from 1990-1998 are used.RESULTS: The results show that IPM technology reduces the use of pesticides by improving the process of rice production, such that pesticides are more efficiently used. In this case, the IPM technology is not a pest control technique.CONCLUSION There is an indication that IPM technology has been adopted by farmers. This is evidence that the IPM programme in Indonesia was successful in this area. Copyright (c) 2008 Society of Chemical Industry.     

数字制图的特点及其应用

本文分析了信息时代地球科学领域数字制图的特点，提出了遥感、GIS等新技术与数字制图相结合的理论基础，并强调了数据采集与更新及可视化与虚拟现实技术等关键性问题，从资源合理利用、生态环境整治及社会经济发展的角度展望了数字制图技术广阔的应用前景。