钢丝绳淋油装置的改造设计及故障分析

本文主要分析了钢丝绳除油装置设计技术难点、创新点以及电气原理图设计,最后分析总结了常见故障的分析及解决方法。     

强反凸模糊集与反凸模糊集、严格反凸模糊集间的关系研究

给出了强反凸模糊集的定义,讨论了强反凸模糊集与反凸模糊集、严格反凸模糊集间的关系,并得到了两个等价条件。     

粗糙集理论在心肺复苏急救中的应用

粗糙集理论能有效地分析和处理不精确、不一致和不完整等各种不完备信息,并能从中发现隐含的知识,揭示潜在的规律。讨论粗糙集理论用于心肺复苏系统中的方法,实践表明该方法具有重要的应用价值。     

Impatience implication of weakly Paretian orders: Existence and genericity

We study order theoretic and topological implications for impatience of weakly Paretian, representable orders on infinite utility streams. As a departure from the traditional literature, we do not make any continuity assumptions in proving the existence of impatient points. Impatience is robust in the sense that there are uncountably many impatient points. A general statement about genericity of impatience cannot be made for representable, weakly Paretian orders. This is shown by means of an example. If we assume a stronger sensitivity condition, then genericity obtains.     

Finite-dimensional utilities

Summary. Sufficient axioms are identified for the existence of a finite- dimensional quasilinear utility function whose lexicographically ordered vectors preserve a decision maker's preference order on a mixture set . It is shown that those axioms are also necessary for the linear lexicographic representation when the underlying set is a mixture space. Received: August 20, 1998; revised version: December 14, 1998     

The Qualitative and Quantitative Models for Performance Measurement Systems: The Agile Service Development

A decision model for selection using analytic hierarchy process (AHP), however, they did not consider interdependence property but consider independence property among alternatives or criteria. It could become inadequate in measurement of actual performance of the decision process. In order to reduce the decision gap, this paper considers when independence among different elements of a system assumption is violated and takes into account the degree of the interdependence among them. The fuzzy analytic network process (FANP) approach with agile theory is developed to apply in analyzing the new service development in the wholesale center. The FANP could not only offer a hierarchy framework more efficiency and accuracy but also improve human judgment on the importance of requirements involving imprecise and vague. The technique has proved useful for comparing the importance among the determinants of agile for new service development in decision maker’s mind, including agile cost, time, robustness and scope. The empirical result points out that “Diverse designs” of new service development is the best choice for the wholesale center, following as “Service extended” and “Technological core”.     

PBTG法快速求解粗糙海面散射增强效应

针对矩量法(MOM)不能有效求解大尺度粗糙介质表面散射特性的问题,采用基于物理的双网格法(PBTG)快速计算了高斯粗糙海面的散射特性,对比了不同矩阵维数下的求解时间,研究了水平、垂直极化下粗糙海面的散射增强现象。通过与矩量法的比较,证明了PBTG法的高效性。     

基于粗糙集的四川省能源可持续发展灰色评估

针对我国能源结构可持续发展评估过程中存在的指标冗余、权重确定主观性较强以及信息不确定等问题,构建基于粗糙集的能源可持续发展灰色评估模型进行合理科学评估。以四川省实际数据为样本,对初步选取的指标进行约简,并利用粗糙集理论中属性重要性对指标进行度量确定权重,最后采用灰色聚类理论中白化权函数构建的可持续发展评估模型进行评估。评估结果显示,四川省能源、环境系统呈现出强可持续发展态势,而经济系统表现为弱可持续性。     

Non-convex optimal portfolio sets and constant relative risk aversion

This paper shows by example that, under constant relative risk aversion (CRRA), the set of optimal portfolios can be non-convex even in the presence of a complete set of Arrow-Debreu securities. This implies that, with exclusively CRRA investors, market models without a strong distributional assumption such as that of the capital asset pricing model cannot be tested by testing the optimality of the market portfolio, or by assuming a representative investor. This demonstration extends the key result of Dybvig and Ross [Dybvig, P. H., & Ross S. A. (1982). Portfolio efficient sets. Econometrica, 50, 1525–1546], who showed an example of non-convexity with less restrictive utility assumptions but which could not apply to the case of a complete set of Arrow-Debreu securities.