Diversification and the cost of debt of bank holding companies

In this study, we investigate the relationship between various dimensions of diversification and the cost of debt for publicly traded bank holding companies (BHCs). We find that both domestic geographic diversification of deposits and diversification of assets lead to a lower bond yield-spread. Diversification of non-traditional banking activities leads to a lower cost of debt only when yield-spread and diversification are estimated simultaneously. In addition, we find that medium-sized BHCs experience a greater reduction in bond yield-spread than small-sized and large-sized BHCs. This is consistent with the too-big-to-fail (TBTF) effects in the banking industry. Furthermore, we document that the association between diversification and yield-spread is bidirectional with higher yield-spreads being associated with greater asset and activity diversification and lower geographic deposit dispersion. The effect of diversification on bond yield-spread is robust after accounting for cross-sectional and serial correlation, and the endogeneity of diversification.     

基于微波固定业务系统的个人通信互扰分析

本文阐述了利用微波固定业务系统实现个人通信的基本原理,建立了该系统的数学模型,得到了个人通信网（ＰＣＮ）的一般特性,比较严格地分析了个人通信网与微波系统之间的互相影响。虽然以下考查的只是单微波系统,但很容易扩展到具有两个或多个微波系统的情况。     

辗辊式井下采油筛管的研制及应用

针对油田在用井下采油筛管防砂过程中出现的砂堵等问题,依据能量转换原理,研制出一种辗辊式井下采油筛管。辗辊式筛管既防砂又不发生砂堵,还具有穿透性和节能效果明显等特点,不仅可用于一般的采油井、含砂量大和压裂的井,还可用于污水泵的保护。     

The Effect of Leasing versus Buying on Entry Deterrence

Models of entry deterrence typically require that incumbents possess a cost advantage as a prerequisite for deterring entry. Potential entrants possess a cost advantage over incumbents, however, if input costs fall over time. This paper models the behavior of an incumbent and a potential entrant when the input cost falls over time and the firms have the option of buying or leasing the input. The model shows that if the future cost savings from new technology exceed the marginal transaction costs of leasing the current equipment, then leasing increases the incumbent's ability to deter entry. Copyright © 2011 John Wiley & Sons, Ltd.     

聚氯乙烯热稳定剂种类的研究现状

概述了聚氯乙烯(PVC)的热降解机理及热稳定剂的作用机理,重点介绍了铅盐类稳定剂、金属皂类稳定剂、有机锡类稳定剂、稀土类稳定剂等的研究发展情况,对热稳定剂的发展趋势进行了展望。     

技术创新项目组合决策支持系统

一、证券投资组合分析 由于证券组合在思想上与技术创新项目组合相同,即都为了在风险和收益作出权衡考虑,因此,许多学者采用Markowits思想进行R＆D项目选择,然而,证券组合模型用于技术创新项目组合决策存在的缺陷有: (1)只适合于证券投资组合,而不适合于一般工程项目和新产品开发项目(技术创新项目)的投资决策.     

从利益相关者信用关系角度看我国股权结构

本文重点研究了股权结构对于利益相关者信用关系的影响.利益相关者之间的承诺及其履约状态、结果能够较为集中地和具体地表达利益相关者之间的关系,而这种关系实际上是受到企业治理因素的直接或者间接影响的,其中,作为治理因素之一的股权结构尤其突出.本文通过实证研究发现了二者之间的四个维度的关系,这四个维度包括管理严谨度、企业绩效、履约积极性、履约时间.     

珠江防洪规划思路、战略部署及实施意见

《珠江流域防洪规划》在编制过程中根据珠江流域的自然条件和经济社会发展的需求．对珠江流域防洪沿革、目前防洪情势、防洪思路的形成过程进行了分析，总结了流域防洪建设的经验教训，以科学发展观为指导，提出了珠江流域防洪战略目标、战略部署及实施意见。     

制度创新与我国转型期的经济增长

新制度经济学提出,在缺乏有效制度的领域或地区,或者一国处在新旧体制转轨时期,制度效率是最高的。同时,在制度创新过程中,经济增长率也较高。我国多年来的改革充分说明,制度可以对经济增长产生巨大的促进或阻碍作用。在转型经济这个大背景下,我国迫切需要在新形式和以前经验基础上,继续坚持制度创新,促进经济的持续增长。     

垄断竞争、产业内贸易与相对工资差距

本文首先运用理论模型推导出垄断竞争市场条件下产业内贸易与行业相对工资差距之间的关系。理论结果显示,当产品的产出技能替代弹性(高技术工人相对雇佣量的变化率/产出的变化率)为正时,产业内贸易将会扩大相对工资差距;当产品的产出技能替代弹性为负时,产业内贸易将会缩小相对工资差距。然后以中美工业制成品产业内贸易为例对该结论进行验证,计量检验结果表明,我国制成品的产出技能替代弹性为正,中美工业制成品产业内贸易扩大了相对工资差距。