Does the degree of relative risk aversion vary with household characteristics?

This study examines household risk taking, using Swedish cross-sectional data based on tax returns from more than 7000 households for 1985. In contrast to previous studies, this study recognizes that households compose different risky portfolios because of their varying characteristics. This study also recognizes real assets as investment goods and takes into account the gains from diversification that emerge when real assets and financial assets are combined. The estimated risk aversion was found to be very large but not systematically correlated with any of the included variables, with the exception of age. The estimated age coefficient suggests that risk aversion increases with age.     

"黑暗时代"的曙光——古希腊"黑暗时代"的延续性与变革

长期以来,西方史学界认为,迈锡尼文明衰落后的四个世纪中,希腊一直处于"贫穷"、"无知"的状态中.但是,新近的研究表明"黑暗时代"不仅存在着与迈锡尼文明的联系,而且是古希腊历史上发生重大变革的时期.在这个时期,希腊的生产技术、经济结构、政治制度、艺术风格、宗教习俗以及社会模式都发生了深刻的变化,这些社会变革为希腊城邦文明奠定了基础.     

航空产品责任诉讼初探——以美国立法与司法实践为视角

发生空难后,航空产品责任诉讼是受伤害旅客获得高额赔偿的重要途径,美国是航空产品责任诉讼的集中地,有着丰富的司法实践经验和较为完备的法律规定。航空产品责任诉讼的责任主体主要是航空产品制造商和航空器出租人,要使其承担产品责任,必须证明航空器存在设计、制造或警示说明缺陷。同时,美国法院常常会在航空产品责任诉讼中应用不方便法院原则,从私人利益和公共利益因素两方面进行考察,判断法院是否对案件行使管辖权。尽管由于法官自由裁量权的行使可能导致不同案件判决结果存在差异,但是通过对美国《第三次侵权法重述:产品责任》和相关案例的研究,在美国航空产品责任诉讼中原告的举证责任、不方便法院原则的适用标准等问题上仍有一些规律可循。     

三阶中立型分布时滞阻尼微分方程的振动定理

研究一类三阶非线性中立型阻尼泛函微分方程,利用Riccati变换和积分平均技巧,建立了保证该类方程的一切解振动或者收敛于零的若干新的充分条件,推广和改进最近文献的结果.     

信息时代提高高校档案管理人员素质研究

如何提高高校档案管理人员的素质,是目前高校档案管理工作面临信息化、网络化、数字化亟待解决的问题。本文对信息时代高校档案管理人员应该具备的素质和存在的问题作了分析。认为提高高校档案管理人员的素质是促进档案管理工作规范化、制度化、科学化之关键所在。     

A Numerical Method for Estimating the Variance of Age at Maximum Growth Rate in Growth Models

Studies on maturation and body composition mention age at peak height velocity (PHV) as an important measure that could predict adulthood outcome. The age at PHV is often derived from growth models such as the triple logistic fitted to the stature (height) data. Theoretically, for a well-behaved growth function, age at PHV could be obtained by setting the second derivative of the growth function to zero and solving for age. Such a solution obviously depends on the parameters of the growth function. Therefore, the uncertainty in the estimation of age at PHV resulting from the uncertainty in the estimation of the growth model, need to be accounted for in the models in which it is used as a predictor. Explicit expressions for the age at PHV and, consequently the variance of the estimate of the age at PHV, do not exist for some of the commonly used nonlinear growth functions, such as the triple logistic function. Once an estimate of this variance is obtained, it could be incorporated in subsequent modeling either through measurement error models or by using the inverse variances as weights. A numerical method for estimating the variance is implemented. The accuracy of this method is demonstrated through comparisons in models where explicit solution for the variance exists. The method of estimating the variance is illustrated by applying to growth data from the Fels study and subsequently used as weights in modeling two adulthood outcomes from the same study.     

Authenticity: Meanings,targets, audiences and third parties

Research shows that perceived authenticity conveys value in many disparate domains. The analytical attention of this research focuses on producers of products and services, identifying which actions and structures the typical individual associates with authenticity. Far less is known about how individuals and audiences differ in their interest, receptiveness and response to potentially authentic entities and services. Even less is known about how regulators, certifiers, critics and other third parties play a role in the social construction of authenticity. Yet the perception and valuation of a product or service as authentic rests largely with heterogeneous audiences and interpretive third parties. Accordingly, in this chapter, we review and develop theory and empirical research about how targeted entities (producers, persons, products, services), audiences and third parties combine to produce authenticity. For targets, we examine the range of actions and structures of various entities that have been empirically associated with authenticity. For audiences, we explore variations in interests in authenticity based on domain engagement, cosmopolitanism, and cross-cultural differences. For third parties, we consider the roles of other audience members, certifiers and regulators. Finally, we conceptualize a co-evolutionary process whereby targets, audiences and third parties combine to generate social pockets where authenticity is recognized and highly valued.     

Discouraged vs. added workers: Variation by gender,age, and marital status

This paper analyzes the relationship between aggregate unemployment and the labor force participation of males and females of differing ages and marital circumstances. According to the discouraged-worker effect, a higher unemployment rate causes some workers to leave the labor force leading to a reduction in both the labor-force participation rate and the unemployment rate. To shed light on this statistical incongruity, a unique data set consisting of monthly observations from the Current Population Survey is used to extract the labor force participation rates of males and females of three different age categories and three different marital classifications. Impulse functions from vector error-correction models indicate that discouraged workers are more likely though not exclusively to consist of married males and females between 50 and 65 years of age. No statistically significant evidence of a net added-worker effect is found among married females or males in any age group.     

Risk factors for severe perineal trauma during vaginal childbirth: A Western Australian retrospective cohort study

AimTo determine rates and risk factors for third and fourth degree perineal tears (severe perineal trauma) in a Western Australian context.Design and settingA retrospective hospital-based cohort study was performed using computerised data for 10,408 singleton vaginal deliveries from 28 weeks gestation.MethodsWomen with severe perineal trauma were compared to those without. Logistic regression analysis, stratified by parity, was used to assess demographic and obstetric factors associated with perineal trauma.ResultsSevere perineal trauma incidence was 3% (338/10408), 5.4% (239/4405) for primiparas and 1.7% (99/5990) for multiparas (p < 0.001). Adjusted risk factors associated with trauma and common across parity included Asian or Indian ethnicity, shoulder dystocia and assisted delivery. Epidural analgesia (OR 0.72, 95% CI 0.54–0.96), preterm birth (OR 0.40, 95% CI 0.23–0.72) and episiotomy (OR 0.54, 95% CI 0.39–0.74) were protective in primiparas, while episiotomy was associated with increased risk in multiparas (OR 2.01, 95% CI 1.18–3.45). Additional factors among primiparas were occipito posterior (OP) delivery (OR 3.35, 95% CI 1.75–6.41) and prolonged second stage (OR 1.98, 95% CI 1.46–2.68), and among multiparas included gestational diabetes (OR 1.78, 95% CI 1.04–3.03) and birth weight >4000 g (OR 1.86, 95% CI 1.10–3.15).ConclusionParity differences in risk factors such as episiotomy, infant weight, OP delivery, gestational diabetes and prolonged second stage warrant investigation into clinical management. Although rates differ internationally, and replication evidence has confirmed consistency for certain demographic and obstetric factors, the development of internationally endorsed clinical guidelines and further research around interventions to protect the perineum are recommended.     

十一届三中全会与中国的改革

党的十一届三中全会,是中国社会主义改革史上的一个界碑。改革是一场革命,又是一场伟大的社会主义建设的实践。２０年来,沿着建设有中国特色的社会主义道路,在农村和城市进行了广泛而深刻的改革,经过起步、展开和深化三个阶段,不仅取得了巨大的历史性成就,而且创造了极为丰富的改革经验