大型城市输电网络演化模型研究

输电网络的安全运行直接关系到国计民生,研究大型城市输电网络演化模型,对于保障城市供电安全更有着显著的意义.本文基于上海地区近五十来年输电网络演变数据的实证研究,结合城市电网的实际演化特点,提出一种灵活的加权复杂网络演化模型算法,通过仿真验证该模型可以较好地反映大型城市输电网络各演化阶段的实际特点,并且进一步证实了上海输电网络既不是无标度网络,也不是完全的随机网络,在节点数达到一定程度时,上海输电网络开始表现出显著的小世界特征.该算法的提出为研究大型城市输电网络特征,分析外力破坏因素导致的停电事故,提供网络模型演化依据.     

网络计量系统设计与应用

为了简化计量装置,降低软硬件复杂度,同时提高可靠性,降低成本,需要对网络计量进行研究,包括从产品的需求到最终端的实现。本文提出了网络计量的应用背景、设计及应用价值。目前,该系统已在现场实施、验证。     

MR340X全岩综掘机及配套设备在煤矿中的应用

随着综合机械化程度的逐步提高,综合机械化掘进程度已成为煤炭生产和安全高效矿井建设必不可少的技术支撑,鄂庄煤矿在大断面开拓全岩巷应用了MR340X型全岩综掘机,并取得了理想效果。     

辽宁高等教育人力投入与效益研究

本文将结合高等院校发展的新环境,在对高等教育人力投入产出有关研究回顾的基础上,探讨高等教育的效益问题。围绕教育人力投入、特别是高等教育人力投入与办学效益之间的关系特征展开研究,深入探讨它们之间关系的判定问题。构建DEA模型,对辽宁省高等教育人力投入产出问题的成因进行分析并给出对策和建议。     

自动抽排水系统在秦岭隧洞中的应用

国内长大隧洞反坡排水常规方式还处于利用人工操作机械的阶段,施工中如泵站设置数量较多,需安排大量劳动力参与排水,管理繁琐,人力、财力耗费也大。本文结合秦岭隧洞7号洞应用实例,介绍反坡自动抽排水系统,供相关专业人员参考。     

Economic versus physical input measures in the analysis of technical efficiency in fisheries

The measurement of technical efficiency requires the estimation of an appropriate production frontier. This is based on a set of inputs that are assumed to influence the level of output. Deviations from this frontier production function are separated into random variation and inefficiency. However, mis-specification of the production function through the use of inappropriate input measures may result in a bias in the measures of inefficiency. In fisheries, production is generally assumed to be a function of stock size, fishing time and the level of physical inputs employed. Defining the appropriate levels of physical inputs, however, is not straightforward, and several alternative measures are available. While economic measures of capital are more intuitively appealing, physical measures are generally readily available and hence less costly to collect. In this study, technical efficiency is measured for three fleet segments operating in the North Sea using three different gear types. The effects of using different measures of capital in the production frontier on the efficiency estimates are examined.     

Survey of Managerial Economics Textbooks

Ten managerial textbooks copyrighted since 1986 are reviewed using these criteria: microeconomic theory range and depth; optional topics included; mathematical rigor; and support materials.     

铁路集装箱空箱调运最优化方案研究

在分析铁路集装箱空箱调运存在问题的基础上,运用线性双层规划理论,以运输成本最小和托运人满意度最大为目标,建立铁路集装箱空箱调运最优化模型,并通过实例检验模型的优化效果,以降低运营成本、提高集装箱使用效率。     

Economic impacts of highway infrastructure improvements part 2. The operational model and its application to Ontario communities

The environmental assessment process in Ontario requires an assessment of the economic impacts of highway infrastructure improvements. This paper describes an operational model that is based on the analytical framework introduced in Kanaroglou et al (1997). The model makes use of widely available data and can be used as a planning tool for fast and efficient assessment of short term direct and indirect local economic impacts in terms of a community's sectoral employment levels. The accuracy of the assessment can be improved by modifying the model parameters using information collected locally. The model can presently be applied to communities in Ontario.     

中国经济型酒店品牌差异化建设思考

近几年,我国经济型酒店品牌发展速度非常快,但品牌规模较小,品牌产品差异化程度较低,产品质量不高,且价格混乱,这严重削弱了中国经济型酒店的竞争力,阻碍了中国经济型酒店的快速健康发展。目前,我国经济型酒店在发展中应实施差异化品牌战略,对酒店的市场、外观、价格及文化进行定位,形成自己的特色品牌,在此基础上进行差异化营销,建立差异化品牌,才能在日趋激烈的竞争中取胜。