Cardinality-based equality of opportunities

We study possible rankings of opportunity profiles. An opportunity profile is a list of opportunity sets, one for each agent in the society. We compare profiles on the basis of the notion of “equality of opportunities”. Our main results show the necessary and sufficient conditions for this comparison to be made using exclusively the information provided by two cardinal measures: the number of common alternatives in all sets of a given profile and the difference between the number of alternatives in the individual sets. We also show that, under additional axioms, we can combine these criteria only in a weighted procedure or in some lexicographic refinements of a weighted procedure.      

几种希夫碱的合成及其异构体的表征

研究了由水杨醛与甘氨酸、L-异亮氨酸和 L-苯丙氨酸反应制得 3种希夫碱的合成方法及性质。红外光谱、氢核磁共振谱证明所合成的希夫碱中存在酚亚胺和酮烯胺的互变异构物。     

Pitfalls of Normal-Gamma Stochastic Frontier Models

Although conceptually pleasing, normal-gamma frontier models lead to difficult estimation problems. It is shown here that unless the sample size reaches several thousands of observations the shape parameter of the gamma density is hard to estimate, and that this carries over to estimates of the stochastic frontier, the individual inefficiencies, and the allocation of the overall variance to the stochastic frontier and to the inefficiencies.     

虚拟企业核心竞争力的评判研究

虚拟企业是在网络经济时代出现并蓬勃发展的一种形式,具有突出的核心竞争力。识别虚拟企业的核心竞争力,是虚拟企业成功运作的关键一步,可以通过采用模糊数学集合论与层次分析法相结合的模糊综合评价法。通过一个仿真算例,说明该种方法的有效性。     

企业财务状况的模糊综合评价

本文首先探讨了模糊财务评价的理论依据，然后运用模糊财务评价的数学模型，提出一种对企业财务状况进行综合评价的方法，并用实例进行分析。     

关于资产证券化及会计处理的探讨

资产证券化是金融创新浪潮中崛起的一种主流融资技术。它使贷款成了具有流动性的证券,盘活企业的存量资产,并优化其财务比率。然而,也相应地引发了一系列的会计问题。主要集中在转让方式或出售方式的会计确认、定价计量、会计报表合并及报表披露。     

Testing for unit roots in time series models with non-stationary volatility

Many of the key macro-economic and financial variables in developed economies are characterized by permanent volatility shifts. It is known that conventional unit root tests are potentially unreliable in the presence of such behaviour, depending on a particular function (the variance profile) of the underlying volatility process. Somewhat surprisingly then, very little work has been undertaken to develop unit root tests which are robust to the presence of permanent volatility shifts. In this paper we fill this gap in the literature by proposing tests which are valid in the presence of a quite general class of permanent variance changes which includes single and multiple (abrupt and smooth-transition) volatility change processes as special cases. Our solution uses numerical methods to simulate the asymptotic null distribution of the statistics based on a consistent estimate of the variance profile which we also develop. The practitioner is not required to specify a parametric model for volatility. An empirical illustration using producer price inflation series from the Stock–Watson database is reported.     

物流运输产品市场效果的模糊综合评价

对影响客户选择物流运输产品的因素进行了分析,在此基础上运用模糊综合评价法对物流企业运输产品的市场效果进行评价。     

The Role of Omitted Variables in Identifying a Long-run Equilibrium Relationship for the Italian Government Growth

We discuss the role of omitted variables in the long run empirical modeling of the Italian government growth based on a Wagner's Law framework. We identify a non-spurious long-run relationship between general government expenditure and domestic product only when our Wagner's Law model is enhanced by a measure of bureaucratic power, as a supply-side variable, and by the ratio of local to state expenditure, as an institutional factor that captures the division of competencies between local and central government in allocating public expenditure. This result is independent from the Wagner's Law specification chosen. The persistence profile analysis shows a slow adjustment to equilibrium for the estimated government growth relationship following system-wide shocks, pointing to rigidities and complex functioning of the public sector.     

全自动降破碎防偏仓保粮筒仓的研究与开发

本文提出一种全自动降低粮食破碎率、防止进粮偏仓的粮食筒仓,为企业安全生产和科学保粮提供了科技支撑。