美国空军卫星控制网的现状与发展趋势

近几年的几场局部战争部分表明了现代军事航天系统的重要性。本文主要介绍了美国最重要的一个军事航天测控网－－空军卫星控制网的情况，希望能对了解美国军事航天测控体制有所帮助。     

黑龙江省医药销售企业现代化管理刍议

黑龙江省各医药销售企业规模日益扩大,伴随着信息技术在各行各业日益深入的应用,传统的手工记账已经不能满足日益增加的业务量的需要及进行有效控制和管理的需要.因此,应用现代财务软件已经势在必行.     

我国产权制度的变迁及其趋势

我国私营经济是在传统的公有制经济的土壤中发展起来的,其发展必然与传统体制发生摩擦与冲突。本文总结了我国产权制度变革的路径,分析了影响私营经济可持续发展的产权制度障碍,根据我国产权制度改革的轨迹,预测了产权制度变迁的趋势和特征。     

三峡工地高压供电线路故障判断方法的探讨

高压供电设备故障特别是输电线路的高压接地故障对工地的影响是相当大的。由于接地故障为隐性故障，没有明显的物理现象，且若是长期接地可能会发展成较为严重的两相或三相短路故障，使系统解列运行直至崩溃；由于工地流动人员较多，还易造成电击事故。利用高压一相接地时在线路中产生零序电压这一特性来迅速判断和切除接地的用电设备，可以保证各项施工的顺利进行。     

文化是生产力发服的内在动力

随着人类社会的发展,社会的文明程度越来越高,人们对文化的认识也越来越深刻.特别是文化与生产力之间的关系引起了人们的广泛关注.文化对生产力发展起着巨大的推动作用.     

Problem shifts and market research: The role of networks in business relationships

This article discusses changes in approach to the study of business relationships, and sees the paradigm concept as constituting an inadequate basis for describing gradually evolving changes in the perception of business. The frequent references to paradigms appear to focus more on state aspects than on change aspects of theory building. The article attempts to trace some of the changes in the perception of markets preceding the emergence of network theories, and relates the presence of an interactional approach to business studies to the concept of problem shifts (Lakatos). The development of interactional approaches in marketing is seen as representing a shift away from theory building commonly found in economics and organizational theory. Changes in the approach to the study of business relationships are interpreted as theoretical or empirical problem shifts, and are thus related to the a priori and a posteriori relevance of the continual evolution of alternative business theories. The article explores some of the epistemological relevance of the network theories to the study of market relationships, and the potential impact on continual changes in approach to the study of markets.     

A comparison of several approximations to the power function of the likelihood ratio test in covariance structure analysis*

In this paper we compare alternative asymptotic approximations to the power of the likelihood ratio test used in covariance structure analysis for testing the fit of a model. Alternative expressions for the noncentrality parameter (ncp) lead to different approximations to the power function. It appears that for alternative covariance matrices close to the null hypothesis, the alternative ncp's lead to similar values, while for alternative covariance matrices far from H_o the different expressions for the ncp can conflict substantively. Monte Carlo evidence shows that the ncp proposed in Satorra and Saris (1985) gives the most accurate power approximations.     

水电站施工期水土流失预测

水电站建设的水土流失问题主要体现在施工期和运行期，并以施工期的影响较为突出．如不采取必要的减免措施，将会对周围生态环境造成无法挽回的损失。本文阐述了水电站建设水土流失的几种常用的预测方法，对水土流失量进行预测，并结合具体工程实例对水电站建设过程中新增水土流失量进行了预测。     

The influence of hydroelectric power generation on the body composition of juvenile Atlantic salmon

The fat and protein content, and thus energy resources of young (parr) Atlantic salmon (Salmo salar) were examined in a temperate river. Juvenile salmon exhibited distinct seasonal patterns of energy storage and use. The lowest levels of energy were found towards the end of winter (mean mass specific energy about 4.3 kJ·g^?1). There was a rapid accumulation of fat in spring/early summer in spite of low‐water temperatures (highest mean content of mass specific energy of about 5.0 kJ·g^?1 in June). By early autumn (August) there was a rapid depletion of fat and energy resources. The decline in specific energy during late summer was of the same magnitude as the corresponding winter decline. Furthermore, total fat and protein content, and thus energy resources of juveniles below a hydroelectric power plant (hydrostation (HS)) differed from those at a (lower) reference station (RS). The younger fish exhibited higher gains, but also larger losses of energy resources compared to corresponding values at the RS. Specifically during the summer, young of year (YOY) had 31% lower total energy content at the regulated site (mean 1.27 kJ per individual) than the RS (mean 1.84 kJ). Higher mortality may occur at the site most affected by the hydroelectric plant, where energy resources on average were higher, but where depletion was also most severe. Copyright © 2006 John Wiley & Sons, Ltd.     

企业员工信息的系统组织与开发利用

网络组织是一种适应信息社会生产要求的新型组织模式 ,本文在分析科层组织存在的问题以及IT对组织变革的技术与环境支持基础上 ,提出了网络组织的基本概念、内容框架。