Theoretical critical value curve and driving force formation of ecological migration in the arid land

The features of the fragile eco-environment of the arid land decide that its capacity of disturbance-resistance is lower. The natural desert oases in the arid land are in mosaic patches distributed in a wide Gobi desert. The population distribution is greatly dependent on water resources. The population is characterized with dispersed distribution, simple production and living style, and poverty and remoteness. The reason why the ecological migrations are carried out lies in the ecological problems. ＂Ecological degradation＂ is the main driving force of the ecological migration. Then, the strength of the driving force depends on the degree of ecological degradation. Hence, whether to carry out ecological migration depends on the extent of ecological degradation. Theoretically, the critical value curve for calculating ecological migration in the arid land is put forward through comprehensive research of relative problems of ecology, economics etc., combined with the ecological migration experience in the arid land, and based on the features of the arid environment. In this article, with this curve, the theoretical research and some practice of the ecological migration have been done from the perspective of natural behavior and governmental behavior of the driving force formation of ecological migration. It analyses the active driving force （factors） and negative forces （factors）, and points out the timing and steps of implementing the ecological migration in the arid land. The theoretical curve embodies certain originality and applicability, which provides a quantitative method for evaluating the degree of ecological degradation and the theoretical base for implementing ecological migration projects.     

Forecasting quality and information

It is assumed that demand for information that subjectively appears to be relevant for forecasting improves forecasting quality. To study this hypothesis a number of forecasting experiments were conducted. Fifty managers from the housing business, from banking, and from a research institution were asked to forecast interest rates, using a Delphi process. They communicated via a computer system, and, to support their judgements, they had access to a data bank that was stored in the same system. Their communication with the system was automatically recorded. Part of the data collected in these experiments is used to study the existence of a relationship between information activities and forecasting results. A weak positive relationship is found if non-linear functions are tested, where information demand is corrected by those data retrievals that seem to have resulted from an inability to handle the information system. For further research a more general, albeit less informative, Boolean model is suggested.     

按木、蔗渣蒸煮黑液的污染特性的研究

探讨了黑液的化学耗氧量（CODmn）、总固形物、色度、灰分、有机物等指标之间的相互影响。结果表明CODmn与总固形物、CODmn与色度、CODmn与友分、CODmn与有机物、总固形物与友分、色度与有机物之间都存在着一定的线性关系，其中绝大部分的相关性较强．     

纯交换经济竞争均衡存在的一种构造证明

本文从消费偏好关系原理推导了效用函数和需求对应的一些性质，建立纯交换经济模型．应用抽象系统的社会平衡定理证明模型竞争均衡的存在     

500 kV变电设施钢构架横梁微机放样运用

近几年来,随着国家电力建设项目的增多,500KV变电站构架产品的市场需求量也逐年增长。为适应市场需要,提高该产品质量,我们在去年年初对构架产品计算机放样做了理论上的论证,并加以实践,通过一年多的实际应用,该技术已逐步成熟。     

对流式视频进行注释网络点播学习系统的设计

针对当前视频点播学习系统的不足,提出了学习者对流式视频学习内容进行注释这一想法,对网络视频进行注释的行为类似于在课本的空白处作笔记,这种把注释内容与视频内容实时关联起来的系统,旨在更好地促进学习者的个性化学习和协作性学习。文中重点分析了对流式视频进行注释的网络点播学习系统的特点和功能,并提出了相应的系统模型,为创设有利于学习者个性化和协作性学习的网络环境提供了参考。     

开拓农村消费市场所面临的问题和应采取的对策

扩大内需关键在开拓农村市场。当前农村消费市场所面临的问题是消费环境差、商品适销对路性差、销售网络和售后服务措施不健全、农民收入增长缓慢、未来增收预期不明确等，一定程度上延缓了农民的即期消费。可从十个方面寻求解决问题的方法。     

高坝洲升船机电力拖动与计算机监控系统设计

高坝洲升船机是我国目前唯一的一座在主拖动系统中采取了交流变频调速系统的大型升船机，在此全面介绍了该船机电力拖动与计算机监控系统的结构，技术性能，设备配置及特点。     

63A水陆坦克驾驶训练模拟器仿真软件的研制

63A水陆坦克驾驶训练模拟器是一个具有两个自由度、能完成陆地和水上模拟训练任务的仿真系统，其仿真软件由视景仿真、姿态仿真、运动学动力学仿真、声音仿真和考评等五个功能模块组成。本文建立了各模块的仿真模型，基于VizualC 和8098汇编语言开发了仿真程序，并进行了模型检验，该软件已得到实际应用，效果良好。     

铁路旅客满意度测评指标体系研究

在对旅客满意的感知状况分析的基础上,结合旅客需求结构分析和实际调研结果,设计与构造出铁路旅客满意度测评指标体系.同时对指标体系进行了指标层次分析,并据此提出了相关建议.