高Si/C高强度铸铁中C、Si、Si/C的作用及其选择

本文叙述了高Si/C高强度灰铸铁中碳、硅元素存在的形式及其对结晶过程的影响。试验表明,当碳当量一定时,随着Si/C的升高,初生奥氏体枝晶数量增多并且细化和强化,从而构成了强度的基础。该铸铁的强度模式应为“初生奥氏+共晶团”。本文对E型石墨存在的必然性和合理性也进行了讨论。     

Lifestyle Options and Economic Strategies: Subsistence Activities in the Mississippi Delta1

Abstract "Subsistence" and "informal economy" are contrasted in their utility as sociological concepts and their ability to explain a variety of activities in two rural Mississippi Delta communities. Literature on subsistence stresses that the desired outcome of participation is not an increase in income but the social rewards of participation itself. Two underlying dimensions of participation in these activities are documented through the literature and through a confirmatory factor analysis of empirical data: life-style choice and economic strategy. These were constructed into indexes and examined individually and in combination as dependent variables using regressors at the community, household, and individual levels. Community ties were weakly associated with participation in such activities. Whites and those with higher incomes participated more in lifestyle choice oriented activities. Participation in general was statistically related to households needing less weekly income and being of larger size. Potential connections with persistent rural poverty are discussed.     

FoxPro2.5开发计划生育管理信息系统

本文分析了微机ＤＢＭＳ———ＦｏｘＰｒｏ２．５的特点及其在开发应用系统的优势和不足,介绍了独立实现的计划生育管理信息系统,还就应用系统的实现方式,对比了事件驱动方式与传统的菜单驱动方式     

我国西南民族地区与东部地区农村发展差距研究

比较分析我国西南民族地区与东部地区农村发展差距及原因,提出缩小农村发展差距的对策。     

高校基建工程决算审计探讨

从总结工程决算审计内容,规范工程决算审计方法入手,较全面地探讨了工程决算审计的重点和技巧.     

中国文化的三次转型与中国比较文学源流

本文通过对中国文化史上的三次文化转型期：汉唐时期、近代鸦片战争时期及“五四”新文化运动时期、二十世纪末期的文化形态的考察,剖析了文化发展过程中由单一文化系统造成的自我设限──封闭模式到吸收他种系统之后文化走向解构──沟通──重构的规律,指出文化转型的积极意义与比较文学注重沟通、对话、交流的本质精神是契合的,实质上二者之间是互为前提、互为因果的互动关系。     

中国二板市场应无限期推迟——从海外二板市场的教训看中国开设二板的艰难性

德国、日本、澳大利亚及香港等海外二板市场失败的原因是由于其大幅度降低了公司入市的标准和要求,有其必然性。美国纳斯达克市场尚存的原因是其特性与主板有重叠之处,从超长期看,其是否成功还难以确定。本文指出中国拟创立的二板市场理由、目标与海外二板市场衰败的原因如出一辙;加之中国A股市场股本结构分裂,股价高企,没有做空机制,二板市场贸然推出,不仅本身可能会蹈海外多数二板市场的覆辙,而且可能对主板A股市场形成严重影响,故建议中国二板市场无限期推迟。在主板市场可通过附设一个科技创业分板,并应尽快恢复深圳证券市场新股发行工作。     

组织文化与公司绩效关系的实证研究

组织文化是企业的无形资源,对形成竞争优势具有重要的作用。本文应用实证研究的方法,对组织文化与公司绩效的关系进行了实证研究。研究结果显示,组织文化与公司绩效具有显著的正相关关系,公司规模对组织文化与公司绩效的关系具有调节作用,小企业文化与绩效的关系更强,而行业类型对其关系没有调节作用。     

具有网络外部性的产品兼容性决策分析

通过Stachelberg竞争模型,本文研究了在具有网络外部性的市场中,拥有专有技术的主导厂商对其兼容技术的授权动机问题。并且得到了主导厂商在纵向兼容决策中最优厂商数量的控制的关系。     

Wide Diameters of Cartesian Product Graphs and Digraphs

In graph theory and study of fault tolerance and transmission delay of networks, connectivity and diameter of a graph are two very important parameters and have been deeply studied by many authors. Wide diameter combining connectivity with diameter is a more important parameter to measure fault tolerance and efficiency of parallel processing computer networks and has received much attention in the recent years. Diameter with width k of a graph G is defined as the minimum integer d for which between any two distinct vertices in G there exist at least k internally disjoint paths of length at most d. In the present paper, the tight upper bounds of wide diameter of the Cartesian product graphs are obtained. Some known results can be deduced or improved from ours.