紧邻炮孔溶洞内所含介质对爆炸应力波传播的影响

针对柱状装药时炮孔近点的水平发育的小尺寸溶洞进行建模,利用Ansys/Ls-Dyna软件对溶洞充满水或空气,水空气并存时的溶洞以及无溶洞时的这四个工况进行了爆破数值模拟,通过观察不同模拟工况下的有效应力云图分布,揭示了近点水平发育溶洞内所含介质对爆炸应力波传播的影响。     

基于分形理论谈安徽沿江环湖城市群的建立

简要介绍了分形理论的原理,运用分形理论,借助于罗特卡公式分析安徽省城市体系规模分布的分形特征,发现安徽省城市体系规模分布符合位序—规模率,存在城市体系规模分布过于均衡及首位城市、大城市规模过小的问题。提出建立安徽省沿江环湖城市群规模体系的发展对策。     

Dilettantism in investigating the impact of the Internet on the wellbeing of the elderly

The surge of interest in the social impacts of the Internet has led information systems experts to apply methods and theories garnered from disciplines such as psychology and sociology. As researcher look across disciplines for methods and explanations of outcomes, they run the risk of researching badly. This may be because they are inexperienced in the theory or method, or because the theory or method is not entirely applicable to the context that challenges them. Thus, in the search for the novelty necessary to achieve publications, and given the lack of experience in applying information systems to issues beyond the corporate sphere, research that does not hold water is being undertaken. This is of particular interest because it is not necessarily being undertaken by the novice. The research reported here was undertaken by experienced researchers using experimental and interview methods with which they had experience in other disciplines (psychology and economics). However, the context of researching the impact of the Internet on the quality of life of first time users over the age of 65 was sufficiently different as to render the methods and possibly the theory inappropriate. This dilettantism must be recognized for what it is.     

逆向物流与正向物流的整合优化设计

在分析逆向物流与正向物流整合意义的基础上构建了逆向物流网络与正向物流网络整合优化的混合整数规划模型,模型以正向和逆向的物流总成本最小化为目标,以回流产品不同状态下的处理量和回收中心容量为约束。最后,利用一个算例验证模型的合理性。     

实木地板装饰施工质量问题研究

文章分析了实木地板在装饰施工中发响、表面不平、拼缝不严、局部起拱等常见问题,并提出了预防与处理方法,旨在提高实木地板的装修质量。     

论推进文化馆免费开放的重要途径

文化馆为人民群众提供文化活动辅导中心与活动中心,是组成公共服务体系的重要部分,它能够保证人民群众的文化权益且是城乡文化统筹发展的重要阵地。文本的讨论重点是推进文化馆免费开放的重要途径。     

直面网络经济--试论网络经济的内涵、形成及影响

当前网络经济以及企业如何在网络环境中生存和发展,已经成为管理学界和公司管理者最为热衷的话题之一。文章首先回答了什么是网络经济,肯定了网络经济是一种新型的经济形态,并简要说明了网络经济兴起的原因。最后重点论述了网络经济所产生的作用和影响,笔者认为对于这个问题可以从经济发展、产业结构和企业管理三个层面来分析。     

Beliefs About the Rich, the Poor and the Taxes They Pay

Abstract . Beliefs about tax burdens are frequently distorted in the direction of the believer's economic self-interest, according to a study of 300 White women in the Boston Standard Metropolitan Statistical Area, of 50 of their husbands in a matched pairs analysis and of 25 Black women. Socioeconomic status is a consistently stronger predictor of the federal tax burden than is ideology, but neither is effective. The federal income tax component of the total tax burden is consistently overestimated. But there is a general tendency to underestimate the total tax burden of the poor.     

浅析作业成本法在企业成本控制中的应用

文章对作业成本法进行了全面的介绍,认为作业成本法是当前企业进行成本控制的有效方法,也是我国企业进行成本核算和成本管理的必然选择。     

司法良知是司法职业道德的根本核心

法官是法治的灵魂、核心。司法腐败的根本原因在于法官司法良知缺失。法官的司法良知是法官职业道德的根本、核心,是法官综合素质中的灵魂、核心,是法官办案质量的根本保障,是判断法官优劣的根本标准。强化法官司法良知是法官队伍建设的中心任务、核心任务,是遏制和消除司法腐败的根本途径。     

巧用不动点求数列通项公式

确定数列的通项公式,对于研究数列的性质起着至关重要的作用。不动点求通项就是其中之一,运用不动点求数列通项既是竞赛数学的内容之一,也是近年来高考命题的热点。文章着重介绍两种运用不动点求数列通项的方法。     

“实践”观点与企业审美文化价值本质探析

本文具体分析了关于价值本质的几种学说,包括需要说、属性说、效用说等对于企业审美文化价值本质这一问题的适用性。然而,对于企业审美文化这样一个具体而复杂的客体而言,其价值本质问题不能直接引用任何一种现有说法。从实践、实践结果出发,从企业审美文化的存在、功能和发展出发来理解企业审美文化价值,才能深刻探寻到其本质。     

A note on the role of the average cost curve in the neoclassical theory of the firm

A number of influential authors have argued that the long-run average cost curve has only a limited role in the theory of the firm. This note examines this claim in more detail. It argues that the curve has an important role in determining long-run equilibrium as it provides an important ‘signal’ to agents in the capital and product market about the extent to which an industry is in disequilibrium. The effect of removing the certainty assumption is then examined and it is argued that the average cost curve is an important input in the assessment of operating risk.     

On the cost-benefit of the regionalisation of the National Health Service

In this paper we analyse in formal terms the desirability of the regionalisation of a National Health Service. The policy consists of a devolution process, i.e. the increase in the health services provision to be decided by a region and financed by an increase in its revenues. The change is a marginal one, as it regards the part of supply of the health services exceeding a minimum standard, which for purposes of equity is maintained uniform in the national territory. As the central government is responsible for this component of the provision of health care (a federal “mandate”), the level of the said component is chosen by this authority and financed by federal taxation. Moreover, the government also applies an equalisation scheme based on the difference between a standard level of tax revenues and the revenues which the region is deemed able to raise for this purpose. Within the theoretical context of welfare improving reforms with distortionary taxation, we derive two conditions which focus on the regional, as well as the social, convenience of regionalisation. Received: May 5, 1999 / Accepted: January 21, 2000     

On the inefficiency of the restricted maximum likelihood

The restricted maximum likelihood is preferred by many to the full maximum likelihood for estimation with variance component and other random coefficient models, because the variance estimator is unbiased. It is shown that this unbiasedness is accompanied in some balanced designs by an inflation of the mean squared error. An estimator of the cluster‐level variance that is uniformly more efficient than the full maximum likelihood is derived. Estimators of the variance ratio are also studied.     

电极液位传感器在蒸汽凝结水回收系统中的应用

干黄管液位控制在蒸汽凝结水回收系统中因凝结水温度高而产生老化、短路，故障率高，而采用不锈铜圆电极液位传感器控制液位，性能可靠，结构简单，节能效果显著。     

公路桥梁施工中高性能混凝土的应用分析

高性能混凝土是近期混凝土技术发展的主要方向,这种采用优质材料配制,便于浇捣、不离析、力学性能稳定、早期强度高、具有韧性和体积稳定性等性能的耐久的混凝土,特别适用于高层建筑、路桥以及暴露在严酷环境中的建筑结构。     

Why Should the Boss Own the Assets?

In the context of an employment relationship, I present an argument suggesting that it is more efficient for the boss to own the productive assets. The idea is that a conflict between productivity and depreciation is internalized if the player deciding what an asset is used for also has residual claims. An empirical test finds evidence consistent with this. By asking whether the boss should own the assets, the paper reverses the reasoning from the literature in which it is argued that the owner has power and thus is the boss.     

Income: the real and the incomparable

The main propositions of this paper are: inter-temporal and interspatial comparisons lose meaning when the arrays of goods and services being priced are too dissimilar; the composition and pricing of GDP are a function of income distribution; income tends to circulate among persons of broadly similar wealth and culture; a significant part of what is recorded as final household expenditure is intermediate in nature; public expenditure is intrinsically intermediate, and poses a variety of conceptual difficulties. Growth is associated with changes which undermine the validity of its measurement.     

地铁项目车站主体结构与附属结构交汇处围护结构拆除工艺研究

地铁施工中,车站附属结构通常在车站主体结构后施工,附属结构与车站交界处存在原有主体围护结构,为打通附属结构与主体结构,交汇处主体围护结构需要拆除。根据附属结构的受力要求,部分车站附属结构设计支撑对撑到交汇处主体围护结构、附属支撑以及交汇处主体围护结构的拆除存在高风险,对车站主体结构与附属结构交汇处围护结构拆除工艺进行研究是必要的。