严寒地区高速铁路混凝土基床聚氨酯保温特性试验研究

基于严寒区京沈客专朝阳试验段路基基床的温度监测资料分析,研究不同厚度聚氨酯保温板对高速铁路路基混凝土基床温度变化特性影响.测试结果表明:①铺设聚氨酯保温板能够有效阻断严寒区环境与路基基床间的热量传递,保温效果与板厚相关;②地温大多数时间呈阳高阴低现象,同时阴、阳坡路基温差波动幅度随埋深逐渐减小;③基床表层阴、阳面各测点的温度变化起始时间一致,而阴面的冻结时间比阳面晚一个月.由此表明,保温板能够有效降低环境与混凝土道床之间的热交换,但是对路基阴、阳坡的影响存在差异.建议在严寒地区高速铁路路基阳、阴坡可以采取不同厚度的聚氨酯保温板,减小阴阳坡地温差异,保持季冻土路基温度变化稳定.     

Public finance and the optimal speed of transition*

We develop a general equilibrium model that jointly considers the influence of capital accumulation constraints and of labour market frictions on the process of transition. We endogenize the economic and budgetary costs of different government policies and show that, early in transition, governments ought to subsidize state firms. Provided that intertemporal commitment is feasible, this policy limits the initial output fall, which relaxes capital accumulation constraints, accelerates transition, and increases welfare. Moreover, by resorting to indirect – instead of direct – taxes, governments can bring the path of transition closer to the first best. Yet, political pressures may induce a policy of suboptimal subsidization.     

雷达接收机数据采集平台及其FFT实现

介绍了小型化、通用化和实时信号处理要求下，雷达接收机的通用数据采集处理硬件平台。采用Xilinx公司最新平台级FPGA产品Spartan-3系列芯片构建平台，并实现其中的FFT于模块。试验表明，处理精度和速度都满足要求，为该方案的可行性和后续模块的实现提供了依据。     

钢板桩围堰在水位变动区和软弱地基中的应用

利用钢板桩作围堰,在水位变动区和软弱地基条件下,采取一定刚度的围护设施来满足深基坑的施工需要;成功地运用了一种既施工简便、节约材料又确保安全的围护结构。根据软土的特点和钢板桩的柔性特征,通过采用模拟基坑开挖过程,按照板桩墙围护结构的设计计算方法进行围堰设计,并通过实际施工中一定的控制措施和对围堰内力、变形监测,确保相邻建筑物和自身结构施工的安全。根据实际运用的效果监测表明,采用的钢板桩围堰,是可行而又较优的一种方案。     

关于高校会计电算化课程体系设置的思考

随着对企业现代化管理要求的不断提高,随着大众计算机知识的不断提高及财会软件开发技术的持续进展,这就要求高校会计电算化课程体系的设置必须适应上述发展的现实需要。本文论述了会计电算化的发展特点对高校会计电算化课程体系的影响,提出了高校会计电算化课程体系的设计思路。     

关于宏观调控若干问题的思考

宏观调控是一个中性概念。宏观调控本身就包含了限制与发展、紧缩与扩张、后退与前进几方面的内容。1992年正式提出向建立社会主义市场经济体制过渡以后，市场经济意义的宏观调控逐步走上历史舞台。从1993年到2003年，中国经济经过了紧缩性和扩张性两轮正相反的宏观调控。目前，中国经济进入新一轮的上升周期。此轮宏观调控转向“中性”政策。所谓“中性”政策，是相对于扩张性政策和紧缩性政策而言的，是一种有保有压、有紧有松、上下微调、松紧适度的政策。“软着陆”的经济含义是，国民经济的运行经过一段过度扩张以后，平稳地回落到适度增长区间。目前，中国的经济增长率和物价上涨率都在正常区间，所以整体上不存在所谓“软着陆”问题。     

我国软预算约束的治理:理论与政策

软预算约束对我国经济的危害甚大,探讨我国预算软约束的治理意义重大.本文认为,应当从下述四个方面来治理我国经济中普遍存在的软预算约束问题:(1)推进国有银企的市场化改革,消除政府干预;(2)建立分散化的银行体系,加强对银行体系的有效监控;(3)实行财政分权,加强地区经济之间的竞争;(4)规范政府经济行为,严格财政金融纪律.     

Drama theory and its relation to game theory. Part 2: Formal model of the resolution process

In a drama, characters' preferences and options change under the pressure of pre-play negotiations. Thus they undergo change and development. A formal model of dramatic transformation is presented that shows how the core of a drama is transformed by the interaction among the characters into a strict, strong equilibrium to which they all aspire. The process is seen to be driven by actors' reactions to various paradoxes of rationality.     

Drama theory and its relation to game theory. Part 1: Dramatic resolution vs. Rational solution

Drama theory differs from game theory in that it does not regard actors' preferences and perceived opportunities as fixed, but as capable of being changed by the actors themselves under the pressure of pre-play negotiations. Thus characters in a drama undergo change and development. A manyperson, multiphase theory of dramatic transformation is presented, showing how thecore of a drama (in the sense of game theory) is transformed by the interaction between the characters into a strict, strong equilibrium to which they all aspire. The process of dramatic transformation is shown to be driven by actors' reactions to various paradoxes of rationality; it is proved that when all these paradoxes have been overcome, a full dramatic resolution has been reached, satisfying actors' emotional and moral demands, as well as the demands of rationality.     

多级斜坡路基软弱地基变形机理和稳定性数值分析

山区公路路基往往是在斜坡上填筑的,这种填筑形式更易于发生变形破坏,故本文以某斜坡路基为研究对象,研究斜坡路基地基变形机理,并用强度折减法分析该斜坡路基的稳定性。结果表明:①地基形变的总体趋势以沉降变形为主,随填筑高度的增加,水平位移逐渐趋于均匀,并表现为侧向外鼓,沉降最大值集中在与填筑体中心相交的区域。②路基中心的最终沉降位移相较于坡脚的2倍;路基整体有向斜坡下滑移的趋势;短坡脚的水平位移发展最快。③斜坡路基随填筑高度的增加,从深层滑动发展为浅层滑动,滑体集中于长坡脚。④随填筑高度的增加,安全系数逐渐降低。