部分信息下一类一主多从激励策略

本文研究在部分信息下,一主多从且从者之间非合作的激励问题,给出了寻找主者的激励策略的一般方法;并对线性二次情形提出了仿射型激励策略所应满足的充分条件.     

一类有迁移的SIS流行病模型

研究一类种群有迁移的流行病模型,得到了这类模型的基本再生数R0,证明了R0＜1无病平衡点是局部渐近稳定的,而当R0＞1时无病平衡点是不稳定的.进一步讨论了疾病持续存在与无病平衡点和地方病平衡点全局稳定的条件.     

Nash equilibrium and the law of large numbers

Pascoa (1993a) showed that the failure of the law of large numbers for a continuum of independent randomizations implies that Schmeidler's (1973) concept of a measure-valued profile function in equilibrium might not coincide with the concept of mixed strategies equilibrium of a nonatomic game. The latter should be defined as a probability measure on pure strategies profiles which is induced by the product measure of players' mixed strategies. This paper addresses existence and approximate purification of the latter and presents an assumption on continuity of payoffs that guarantees the equivalence between the two equilibrium concepts.     

HFC152a/HCFC141b混合气体水合物相平衡特性研究

1引言气体水合可使水在8—12”C络合结晶形成水合物，同时释放反应热（蓄冷）。其反应热与传热性能均较理想，被认为是理想的空调蓄冷介质山。早期研究的主要是Rll和R12的水合物。由于Rll和R12严重破坏大气臭氧层而受控，因此寻找替代CFC的新型致冷剂气体水合物成为当前的研究重点［‘－‘］。近年来我们根据混合物性能互补原理，提出了利用混合气体水合物构造性能优良的蓄冷材料的设想［‘1。HFC152a和HCFC141b分别是R12和Rll的首选替代物之一。HFC152a是较活跃的致水合物质，但相变温度和压力偏高。而HCFC141b水合物的相变温度…     

Stationary and nonstationary strategies in Hotelling's model of spatial competition with repeated pricing decisions

This paper examines Hotelling's model of location with linear transportation cost. Existence of pure strategy subgame perfect equilibria in the infinitely repeated price game with fixed locations is proved. These subgame perfect equilibria have a stick and carrot structure. Given firm locations, there are discount factors sufficiently high that there is a subgame perfect equilibrium with a two-phase structure. Given the discount factors, there are stationary subgame perfect equilibria for a wide range of locations. However, for some pairs of location, no symmetric simple penal code exists, all subgame perfect profiles are nonstationary, and there is only one seller in the market in infinitely many periods. Received July 1996/Final version May 1998     

A NEW SOLUTION TO STRUCTURAL FUZZY FINITE ELEMENT EQUILIBRIUM EQUATIONS (SFFEEE)

I.IntroductionInthefieldofthefuzzyfiniteelementmethod(FFEM),tostudynow,tosolvetheequilibriumequationsisofmomentoussignificance.EspeciallyfortheapplicationoftheFFEMtoengineeringproblems,thekeyworktodoistoexplorehigh-speedandhigh-effeciencysolutionstoequili…     

Higher-Order Terms in the Capillary Limit Approximation of Viscous-Capillary Flow

We propose a new approximation to the solution of the steady state equations describing two-phase immiscible flow in a porous medium. It is demonstrated that the general procedure contains the capillary equilibrium approximation as a special case. The solution is approximated by a perturbation series in a parameter related to the capillary number. The expansion of the solution results in a sequence of decoupled linear elliptic boundary value problems. This sequence is solved numerically by a Finite Element method, and the accuracy of the approximations is evaluated.     

球环位形磁流体平衡的数值模拟

对原有的托卡马克平衡编码SWEQU进行了改进。使之适用于小环径比球形环装置的磁流体研究。用改进后的平衡编码SWEQU模拟了放电初始阶段等离子体平衡位形的演化及稳态阶段的双零偏滤器平衡位形。结果表明。不但町以得到球形环装置稳态阶段的平衡位形，也可以模拟等离子体电流上升阶段平衡位形的演化过程。     

平衡移动法测定M_mR_n型配合物组成和稳定常数的研究

根据平衡移动原理推导出一种能判别单核或多核配合物并直接测定ＭｍＲｎ型配合物组成和稳定常数的平衡移动法公式ｌｇ（Ａｉ／（Ａｍａｘ－Ａｉ）ｍ）＝ｎｌｇｃ′Ｒ＋ｌｇ（ｍ·β·ˉ（ｃＭ／Ａｍａｘ）（ｍ－１）。用Ｓｃ３＋－ＣＰＡⅢ和Ｆｅ３＋ＣＡＳ两个配合反应体系加以验证，结果令人满意。     

Stochastic Games with Average Payoff Criterion

We study two-person stochastic games on a Polish state and compact action spaces and with average payoff criterion under a certain ergodicity condition. For the zero-sum game we establish the existence of a value and stationary optimal strategies for both players. For the nonzero-sum case the existence of Nash equilibrium in stationary strategies is established under certain separability conditions. Accepted 9 January 1997