电力系统仿真技术的发展和应用

简介电力系统仿真技术的发展和基本概念，并分别简述了模拟计算机、数字计算机和混合计算机在电力系统中的应用，以及电力系统仿真培训装置的作用     

应用投入产出法对某市经济发展状况的分析

建立地区投入产出模型．以某市１９９２年的投入产出表为依据，对该市１９９３年的经济发展状况进行了预测性的分析．     

带约束的非线性回归诊断混合模型分析

研究了带有约束的均值漂移和方差加权的混合非线性回归模型．得到了相应的一阶和二阶诊断统计量。同时证明了带约束的均值漂移非线性模型和带约束的数据删除非线性模型，它们相应的估计量相等。     

高碾压混凝土拱坝结构特性试验研究

本文结合沙牌碾压混凝土拱坝坝体设置三条诱导缝，坝体设置周边应力释放缝，坝体不设缝的三种情况，进行了整体结构模型试验。分析了坝体的应力、变形及破坏特性，为工程的设计和施工提供了参考依据．     

多个气藏优先开发排序问题研究

本文在［６］的基础上，对勘探结束待开发的若干个气藏建立了优先开发评价指标体系及其结构模型。将改进层次分析法和逼近理想点法结合在一起，在既考虑开发效果又考虑开发投资的情况下，成功地对待开发的多个气藏进行了优先开发排序。     

确定土壤刚度的机械阻抗方法

运用机械阻抗(Mechanical impedance)方法,结合不同土壤的机械模型(Mechanical model),给出了表示特定土壤一维刚度的数学表达式.     

纵列双轮牵引性能试验设计研究

本文采用正交试验方法,对纵列双轮牵引性能进行了系统的试验设计研究。试验全面分析不同因素包括驱动方式、结构参数匹配、载荷分配以及不同轮胎气压对牵引性能的影响。     

Modeling Uncertainty in an Object-Oriented Reservoir Operations Model

In recent years, reservoir management considerations have expanded to include environmental and recreational objectives, many of which are often difficult to quantify. With a larger set of operational objectives comes the need to identify tradeoffs and uncertainties among the various objectives. Uncertainty modeling may contribute to better reservoir management by identifying and quantifying the sources of significant uncertainty in predicting reservoir and river conditions that affect environmental habitats and recreational conditions. We implement a first-order, second-moment algorithm in RIVERWARE, an object-oriented river and reservoir modeling environment. The method is developed and applied to a case study from the lower Colorado River, where a preexisting deterministic model is used for reservoir operations and planning. The case study involves evaluation of uncertainties associated with prescribed reservoir pool elevations for purposes of recovering endangered fish species. Comparison of historical forecasts with observed data can provide managers with insight into operational policies that result in greater system uncertainty. Identifying these sources of uncertainty can guide managers in the development of future operational guidelines.     

A unified signal transition graph model for asynchronous control circuit synthesis

Characterization of the behavior of an asynchronous system depending on the delay of components and wires is a major task facing designers. Some of these delays are outside the designer's control, and in practice may have to be assumed unbounded. The existing literature offers a number of analysis and specification models, but lacks a unified framework to verify directly if the circuit specification admits a correct implementation under these hypotheses.Our aim is to fill exactly this gap, offering both low-level (analysis-oriented) and high-level (specification-oriented) models for asynchronous circuits and the environment where they operate, together with strong equivalence results between the properties at the two levels. One interesting side result is the precise characterization of classical static and dynamic hazards in terms of our model. Consequently the designer can check the specification and directly decide if the behavior of any implementation will depend, e.g., on the delays of the signals described by such specification.We also outline a design methodology based on our models, pointing out how they can be used to select appropriate high and low-level models depending on the desired characteristics of the system.     

The role of surface roughness in the friction of sliding contacts

Results are presented of studies to assess the role of surface roughness in the friction of sliding contacts. A model of the surface roughness uses conical steel needles. A theoretical model based on the mechanics of interaction is included. Experimental and calculated results are discussed in relation to real engineering surfaces and the models compared