A semigroup approach to the strong ergodic theorem of the multistate stable population process

In this paper we first formulate the dynamics of multistate stable population processes as a partial differential equation. Next, we rewrite this equation as an abstract differential equation in a Banach space, and solve it by using the theory of strongly continuous semigroups of bounded linear operators. Subsequently, we investigate the asymptotic behavior of this semigroup to show the strong ergodic theorem which states that there exists a stable distribution independent of the initial distribution. Finally, we introduce the dual problem in order to obtain a logical definition for the reproductive value and we discuss its applications.     

基于鲁棒控制的期权定价方法

首先从经济学的行为分析出发 ,在鲁棒控制的框架下给出了期权卖价、买价和公平价格的严格定义 .然后通过求解微分对策 ,得到了定价模型值函数的封闭解 .最后给出了期权价格及其对冲策略的显式表达式 ,并比较了这种期权定价方法与随机方法的优缺点     

ODE法在多目标规划中的应用

在一定条件下,从多目标规划问题的任一可行解的某邻域出发,建立了沿着所建立的常微分方程组的轨线,关于部分交元总收敛到原多目标规划问题的(弱)有效解。     

创新型人力资本及其集成决定论--一种对企业绩效差异成因认识的新视角

经济与管理学界对企业绩效差异成因的认识主要可概括为两大流派：企业绩效差异成因外生论和企业绩效差异成因内生论。其中,企业绩效差异成因内生论又可以分为企业绩效差异成因契约论和企业绩效差异成因能力论。作者在对这两大流派进行分析和评述的基础上,论述了企业绩效差异成因契约论和企业绩效差异成因能力论相融合的必要性、可能性与模型构建,得出了创新型人力资本及其集成才是企业绩效差异的最根本原因的结论。     

Nonshared Environment Research

SUMMARY

This review focuses on conceptualizations of nonshared environment and on four areas of research that should be targeted for future growth. It is argued that there are at least two different approaches to the study of nonshared environment. “Experience-oriented” researchers center on sibling differential experiences in the family and their role in children's development. “Outcome-oriented” investigators focus on the search for environmental origins of individual differences in outcomes. Turkheimer and Waldron's (2000) concept of objective versus effective nonshared environment and Reiss and colleagues' (2000) notion of single-system versus multi-system nonshared environment processes are also discussed. Four topics for future research are outlined: (1) age-related changes and development; (2) the role of the self; (3) the role of context; and (4) the importance of extrafamilial experiences. More work in these areas will lead to useful theories of how nonshared environment processes are linked to sibling and individual differences in behavioral development and adjustment.     

化学热力学函数偏微商等式证明方法探讨

从基础热力学函数的相互关系出发，结合偏微商运算基本原理，归纳热力学函数偏微商变换的常用途径，并对化学热力学函数偏微商式的证明方法及技巧进行一些具体研讨。     

高阶混合型周期系统的周期解

应用Ｆｏｕｒｉｅｒ分析的方法，结合一些不等式技巧得到了ｎ阶常系数带有滞后与超前偏差变元的混合型线性周期系统存在周期解的充要条件．     

一阶非线性常微分方程可积类型的推广

文中提出新的四类非线性常微分方程，借助某些方法与技巧，论证了这几类方程可用积分法求解，获得的结论推广了文献中相应的结果。     

普通台面工艺制作新型超薄基区负阻HBT

负阻型HBT既保持了原HBT高频、高速的特点,同时又具有负阻、双稳、自锁等特性,是一种极具研究价值的新型负阻器件。该文从Early效应造成超薄基区穿通,器件由双极工作状态向体势垒管工作状态转变从而形成负阻特性的思路出发,通过对材料结构的特殊设计,采用普通台面工艺研制出了基区厚度为8nm的负阻型HBT。该器件具有独特且显著的可变电压控制型负阻特性,其电流峰谷比大于1000,并伴有电流控制型负阻。     

Turbo-DFH迭代译码算法

针对Turbo-DFH系统的特点,提出了修改的SOVA算法,用于迭代译码过程中子译码器软输出的计算。在AWGN信道下,对Turbo-DFH系统的性能进行了计算机仿真。仿真结果表明Turbo-DFH系统的误比特率性能比采用维特比检测算法的传统DFH系统有明显改善。