一类非线性时滞微分方程的振动性

讨论了非线性时滞微分方程Ｈ（ｔ，ｘ（ｔ），ｘ（ｔ—ｒ）＋ｆ（ｔ，ｘ（ｔ—τ））—ｇ（ｘ（ｔ—σ））＝０的振动性，推广了有关文献的部分结果．     

Determinants of housing quality: A comparison of white,African-American,and Hispanic single-parent women

This study examines housing quality among three groups of single-parent women: white, African-American, and Hispanic. Three indicators of housing quality—crowding, affordability, and satisfaction—are used to discover the extent to which these groups experience housing problems. This study also explores differences and similarities in the factors that precipitate problems in housing quality for these three groups of single parents. Findings suggest important differences and similarities in the nature of housing quality problems among white, African-American, and Hispanic single-parent women. The specified variables explained about 20% of the variance in crowding, housing affordability, and housing satisfaction. On measures of objective and subjective housing quality, white single mothers are better housed than their African-American or Hispanic counterparts. Hispanic single mothers have the largest housing cost burden and average more persons per household than the other groups. African-Americans are twice as likely as either group to live in low-quality housing and reported the lowest average satisfaction with their housing. Her research interests include housing and neighborhood assessment and women and public policy issues. She has recently published articles inUrban Affairs Quarterly andHousing and Society on housing and neighborhood assessment criteria among black urban households and the housing cost burden of various groups of female-headed households. She received her Ph.D. from Ohio State University. Her research interests include the housing adjustment behavior of women and public policy. She has recently completed her thesis on the role of noncustodial parents in determining the quality of life of their children. She is also the recipient of the Tessie Agan Award for research excellence from the American Association of Housing Educators for a paper titled “Unterstanding Constraints and Residential Satisfaction among Low-Income Single-Parent Families.”     

一类收敛级数求和的微分方程解法

从微分方程的角度出发 ,分三个方面讨论了一类收敛级数求和问题的具体解法。     

供应链管理模式下的企业外包设计研究

供应链管理是近年来在国内外逐渐受到重视的一种新的管理理念与模式,其管理思想是使企业将主要精力放在核心业务上,充分发挥优势,企业中的非核心业务外包给合作企业来完成。因此,企业外包设计成为供应链管理思想的一个重要方面。基于这一背景,首先探讨了企业外包的含义及其构成元素;并根据威廉姆森的新制度经济学中经济业务交易的规制结构对企业外包的规制层次进行划分;最后,构建了在供应链管理模式下基于交易成本和核心竞争力相结合的企业外包设计模型。     

Valuation of childhood risk reduction: the importance of age, risk preferences, and perspective.

This article explores two problems analysts face in determining how to estimate values for children's health and safety risk reductions. The first addresses the question: Do willingness‐to‐pay estimates for health risk changes differ across children and adults and, if so, how? To answer this question, the article first examines the potential effects of age and risk preferences on willingness to pay. A summary of the literature reporting empirical evidence of differences between willingness to pay for adult health and safety risk reductions and willingness to pay for health and safety risk reductions in children is also provided. The second dimension of the problem is a more fundamental issue: Whose perspective is relevant when valuing children's health effects—society's, children's, adults‐as‐children, or parents'? Each perspective is considered, followed ultimately by the conclusion that adopting a parental perspective through an intrahousehold allocation model seems closest to meeting the needs of the estimation problem at hand. A policy example in which the choice of perspective affects the outcome of a regulatory benefit‐cost analysis rounds out the article and emphasizes the importance of perspective.     

降低商务成本 优化投资环境

我国作为一个经济发展势头强劲的国家,改善投资环境,增强投资环境的吸引力十分重要。商务成本是投资环境重要的组成部分。本文着重阐述了商务成本的内涵、影响因素及降低商务成本的主要途径。     

简论晚清新式企业内部管理的若干改革主张

晚清时期,人们通过对西方企业管理活动的考察,反思了各类新式企业实践活动中的诸多管理弊端,提出了许多改善企业内部管理的主张,这些改革建议涉及到企业的各个方面,诸如人事管理、财产物质管理、成本费用管理、市场营销与资金管理等。     

对工程造价控制管理问题的探讨

分析我国工程造价管理中存在的问题;从工程建设全过程出发,论述如何控制工程造价。     

作业成本法存在的问题及相应对策

作业成本法与传统成本计算最大的不同在于它不是以成本论成本 ,而是把着眼点放在成本发生的前因后果上 ,实现了成本计算与控制的结合。作业成本法的关键在于划分作业、寻找作业动因。本文在介绍作业成本法理论的基础上 ,重点探讨如何对第四类作业即发生间接成本、期间费用的作业进行划分 ,寻找作业动因     

刚体转动渐进跟踪控制的逆系统方法

逆系统方法是以非线性控制为目的,以直接分析为途径,以动态系统的逆概念为核心。该文将逆系统方法应用于刚体动力学中,运用非线性控制的逆系统方法设计Euler动力学方程的控制器,通过对一个陀螺的外力矩进行实施控制,使刚体在动坐标系下的角速度稳定跟踪指令,来实现对刚体转动的渐进跟踪控制。