基于球形孔扩张理论的压扩支盘桩挤密效应分析

从塑性力学的角度出发,应用球孔扩张理论,并假定土体为均质、各向同性的理想弹塑性体,引入了土性参数剪胀角以区别于非土体等其他材料,采用摩尔一库仑屈服函数和不相适应的流动法则求得球形扩张问题的解析解,分析成桩过程中桩周土体的应变与应力并应用此理论估算压扩支盘桩单桩承载力。     

榆林市城乡群众体育基础设施现状分析与对策研究

城市和乡村作为两种不同的生活形态在制度设计、经济建设和资源配置等方面的差异是显著的。经调查分析榆林市城乡群众体育基础设施的配置存在差异进而影响着榆林市城乡群众体育的协调发展。榆林市城乡群众体育协调意在实现城乡体育资源合理配置即体育基础设施的发展,从而使榆林市城市和乡村群众体育有秩序、有层次的向更高的目标迈进。本文在分析城乡群众体育协调发展必要性的基础上,探讨了榆林市城乡群众体育协调发展的内涵和基本理念.并对协调发展榆林市城乡群众体育进行对策分析。     

一阶常系数线性齐次微分方程组的两种解法

一阶常系数线性齐次微分方程组其中的求解,一般有两种解法。第一种,归结为求矩阵A的特征值和特征向量,微分方程组(1)的解的一般结构完全由代数问题的解所决定。第二种,归结为求矩阵A的Jordan标准形,从而可以写出,由其中为可逆矩阵,求出即为方程组(1)的解。     

Walras and pareto on the meaning of the solution concept in general equilibrium theory

The notion of solution plays a crucial role in the conceptual system of Léon Walras, the founder of the General Equilibrium Theory (GET). In this paper, after introducing the two solution concepts employed by Walras in the development of his version of GET, respectively called the “theoretical” and the “practical” solution, we discuss the problems such peculiar conception gives rise to, as well as the attempts Walras makes to dodge them. Then we explain why and to what extent Pareto, Walras’ immediate successor and co-founder of GET, departs from Walras’ original conception, progressively developing an independent viewpoint on the issue of equilibrium computability in GET. (JEL:B13, B21, B31, B41, C62, C68, D50)     

OPTIMAL INVESTMENT OF A LIFE INTEREST

We consider the problem of a trustee faced with investing a sum of money, the interest from which will be received by one party (the life-tenant) during his lifetime while the capital will go to another party (the survivor) on the death of the life-tenant. We assume mat there are n + 1 assets in which the trustee may invest— n risky assets of geometric Brownian motion type and one nonrisky asset. Under assumptions as to the utility functions of the two parties, we find the collection of Pareto optimal investment strategies for the trustee together with the corresponding payoffs. We do this by optimizing the payoff of the Lagrangian for the problem. We go on to present the Nash optimal solution for the trustee.     

市场供需量受价格波动影响之研究

本文研究了价格函数随时间变化引起供给量和需求量的变化规律。主要针对不同情况分别讨论了价格波动的蛛网模型、微分动力学模型及差分方程模型。对各模型进行了定量求解,并进一步具体讨论了这三种模型的价格波动周期解及稳定性的条件。     

Joining a Queue or Staying Out: Effects of Information Structure and Service Time on Arrival and Staying Out Decisions

We study a class of single-server queueing systems with a finite population size, FIFO queue discipline, and no balking or reneging. In contrast to the predominant assumptions of queueing theory of exogenously determined arrivals and steady state behavior, we investigate queueing systems with endogenously determined arrival times and focus on transient rather than steady state behavior. When arrival times are endogenous, the resulting interactive decision process is modeled as a non-cooperative n-person game with complete information. Assuming discrete strategy spaces, the mixed-strategy equilibrium solution for groups of n = 20 agents is computed using a Markov chain method. Using a 2 × 2 between-subject design (private vs. public information by short vs. long service time), arrival and staying out decisions are presented and compared to the equilibrium predictions. The results indicate that players generate replicable patterns of behavior that are accounted for remarkably well on the aggregate, but not individual, level by the mixed-strategy equilibrium solution unless congestion is unavoidable and information about group behavior is not provided.JEL Classification: C71, C92, D81     

校园网安全方案设计浅述

计算机技术、网络技术、信息处理技术以及多媒体技术的飞速发展,为高校信息化建设注入了新的活力。高校信息化建设必须依托校园网。只有建成高速、稳定、安全、可靠的校园网,高校的数字信息资源、网络服务、信息服务及MIS等应用系统,才能正常运行。     

我国天然气发电存在问题及对策建议

天然气发电具有能源利用效率高、环境影响小、启停灵活等优势,积极发展,有利于提高能源利用效率、保护大气环境、优化电源结构、满足电力系统调峰要求等。对我国天然气发电存在的主要问题进行了分析,提出了我国天然气发电健康有序发展的对策和措施建议。     

十二五期间中国军人保险制度发展研究

探讨十二五期间中国军人保险制度的发展,首先要明确军人保险制度发展的出发点,在此基础上明确军人保险制度发展的目标和任务,并紧紧围绕完善军人保险制度的目标任务,立足于军人保险现实情况,统筹兼顾,循序渐进,从不同层面、不同角度完善军人保险制度。具体包括：建立大病医疗保险与基本医疗保障相结合的新型军人医疗保险制度,建立军人分类养老保险制度,完善军人伤亡保险制度,建立军人互助保险等。