现实生产中产出的非期望输出往往是多维度的。然而,在学术界,尚未有学者关注弱自由处置假设下存在多维非期望产出以及总额限制时的环境绩效评价问题。本文将现有的零和收益(Zero Sum Gains,ZSG)DEA模型中的非期望产出从单维度扩展到多...现实生产中产出的非期望输出往往是多维度的。然而,在学术界,尚未有学者关注弱自由处置假设下存在多维非期望产出以及总额限制时的环境绩效评价问题。本文将现有的零和收益(Zero Sum Gains,ZSG)DEA模型中的非期望产出从单维度扩展到多维度的情形,提出了一类非径向ZSG-DEA模型。接着,针对该类模型存在难以求解的问题,通过适当变换,降低了模型的计算难度,并且提供了一种可行的方案求解某些不存在可行解的有效单元。最后,将所提模型应用于评价我国30个行政区域的环境效率的实证研究中,验证了方法的适用性和有效性。展开更多
Methods of finding quasi-normal modes of non-rotating relativistic stars have been well established, however, none of the existing treatments which take spacetime and fluid oscillations fully into account can determin...Methods of finding quasi-normal modes of non-rotating relativistic stars have been well established, however, none of the existing treatments which take spacetime and fluid oscillations fully into account can determine modes of long decay time, e.g., the p and g mode series, or the f modes for stars with low compactness ratio （M/R）. In this paper we show how the quasi-normal modes of long lifetime can be determined through refinements of a treatment originally due to Detweiler and Lindblom. The determination of the p mode series has been argued in the literature to have implication on the life time of gravitational wave sources and stellar stability. In this paper we 1） provide detailed steps in our treatment to facilitate future effort in this direction; 2） correct mistakes in the literature on the formulation; and 3） analyse the accuracy of the quasi-normal mode frequencies obtained and the limitations of the treatment.展开更多
Analytical expressions are given for computing the magnetic potential and charac-teristic functions produced by the non-radial deflectors.These expressions are useful for designingthe defiectors such as those used in ...Analytical expressions are given for computing the magnetic potential and charac-teristic functions produced by the non-radial deflectors.These expressions are useful for designingthe defiectors such as those used in the color picture tubes and the electron beam lithographysystem.The computing results are in agreement with the measured values.展开更多
We study sufficient conditions on radial and non-radial weight functions on the upper half-plane that guarantee norm approximation of functions in weighted Bergman,weighted Dirichlet,and weighted Besov spaces on the u...We study sufficient conditions on radial and non-radial weight functions on the upper half-plane that guarantee norm approximation of functions in weighted Bergman,weighted Dirichlet,and weighted Besov spaces on the upper half-plane by dilatations and eventually by analytic polynomials.展开更多
文摘现实生产中产出的非期望输出往往是多维度的。然而,在学术界,尚未有学者关注弱自由处置假设下存在多维非期望产出以及总额限制时的环境绩效评价问题。本文将现有的零和收益(Zero Sum Gains,ZSG)DEA模型中的非期望产出从单维度扩展到多维度的情形,提出了一类非径向ZSG-DEA模型。接着,针对该类模型存在难以求解的问题,通过适当变换,降低了模型的计算难度,并且提供了一种可行的方案求解某些不存在可行解的有效单元。最后,将所提模型应用于评价我国30个行政区域的环境效率的实证研究中,验证了方法的适用性和有效性。
基金supported by the Science Foundation of the Education Department of Hunan Province of China (Grant No. 07c578)in part by the US National Science Foundation NRACthe McDonnell Center for the Space Sciences of the Washington University(Grant No. MCA93S025)
文摘Methods of finding quasi-normal modes of non-rotating relativistic stars have been well established, however, none of the existing treatments which take spacetime and fluid oscillations fully into account can determine modes of long decay time, e.g., the p and g mode series, or the f modes for stars with low compactness ratio （M/R）. In this paper we show how the quasi-normal modes of long lifetime can be determined through refinements of a treatment originally due to Detweiler and Lindblom. The determination of the p mode series has been argued in the literature to have implication on the life time of gravitational wave sources and stellar stability. In this paper we 1） provide detailed steps in our treatment to facilitate future effort in this direction; 2） correct mistakes in the literature on the formulation; and 3） analyse the accuracy of the quasi-normal mode frequencies obtained and the limitations of the treatment.
文摘Analytical expressions are given for computing the magnetic potential and charac-teristic functions produced by the non-radial deflectors.These expressions are useful for designingthe defiectors such as those used in the color picture tubes and the electron beam lithographysystem.The computing results are in agreement with the measured values.
文摘We study sufficient conditions on radial and non-radial weight functions on the upper half-plane that guarantee norm approximation of functions in weighted Bergman,weighted Dirichlet,and weighted Besov spaces on the upper half-plane by dilatations and eventually by analytic polynomials.
