A Bivariate Generalization of Gamma Distribution

In this article, a bivariate generalisation of the gamma distribution is proposed by using an unsymmetrical bivariate characteristic function; an extension to the non central case also receives attention. The probability density functions of the product and ratio of the correlated components of this distribution are also derived. The benefits of introducing this generalized bivariate gamma distribution and the distributions of the product and the ratio of its components will be demonstrated by graphical representations of their density functions. An example of this generalized bivariate gamma distribution to rainfall data for two specific districts in the North West province is also given to illustrate the greater versatility of the new distribution.     

历史上岭南诸神考源

雷神,是岭南越人的原生神灵。在历代汉族官员的推动下盛行了几千年。龙母原生于岭南越人中,但她成为神灵,是汉族文化传入的结果。伏波神却是汉族官员哄抬造成的。三界神和花婆神,一是岭南本地的首领兼巫觋,一是随汉族文化的传入而传入,因岭南社会的发展而先后为各地居民所接受。这些神在历史上先后为岭南人所奉祀,各为其用,控制了岭南越人及其传人的思维,决定了他们的价值取向,阻碍了他们的信仰从巫术阶段的向上提升。     

Individual Differences in Women's Salivary Testosterone and Estradiol Following Sexual Activity in a Nonlaboratory Setting

Objectives: The current study evaluated women's salivary testosterone and estradiol levels before and after exposure to sexual stimuli in a U.S. sex club. Methods: Behavioral data and salivary samples were collected from 19 women during semistructured interviews. Results: Findings demonstrate substantial individual differences in the magnitude and direction of women's hormonal changes following sexual activity. Conclusions: In an age of individualized medicine, these findings highlight the need to better understand factors shaping variation in physiological responses to sexual activity. Findings contribute to a relatively small and contradictory literature on women's hormonal responses to sexual stimuli.     

论五四时期的“性伦”文化

“五四”知识分子否定和批判了性伦偏向、性伦本能、性伦禁忌、性伦杀人等方面的封建性伦文化 ,提倡和主张高尚合理的两性状态、新式道德观和贞操观、进行性教育和生育节制教育等新式性伦文化 ,并开始了初步的实践活动。尽管五四时期性伦文化的变革还存在明显的历史局限性 ,尤其在婚俗变革过程中呈现出曲折性与复杂性 ,但它仍是开启现代文明性伦生活的先导 ,促进了社会解放、思想解放和文化转型。     

Experience,perceptions and attitudes of parents who planned home birth in Spain: A qualitative study

BackgroundA woman’s home birth and postpartum experience can have a major impact on her baby’s, partner’s and family’s well being. It is a life-altering event that can help improve or worsen women’s self-esteem and self-confidence.AimThe aim of this study was to describe and understand the experiences, perceptions and attitudes of parents who planned a home birth in Spain.MethodsA qualitative study was conducted based on Gadamer’s hermeneutic phenomenology. Two main methods were used for data collection; narratives and individual in-depth interviews with 14 mothers and 8 fathers who had planned a home birth in the last year. Inductive analysis was used to find themes based on the data obtained.FindingsSix main themes emerged from the data analysis: (1) in search of a natural and personalised birth, (2) breaking with social pressures, (3) experience of home birth for the mother, (4) role of the father in home birth, (5) how does the father experience home birth?, (6) home birth is not available to all mothers and fathers.ConclusionFor the mothers and fathers in this study the home birth experience fulfilled their previous expectations of an intimate and natural moment, making it a highly satisfying experience for both. However, parents expressed experiencing negative feelings such as fear and worry about complications and labor pain. According to our research society in general and public health professionals in particular issue numerous criticisms and value judgments towards mothers and fathers who opt for a home birth in our country. In addition, the study shows the economic and cultural inequalities in access to home birth in Spain.     

A qualitative study of the impact of adverse birth experiences on fathers

BackgroundBeing present during labour and birth can, for some fathers, result in feelings of fear, uncertainty, anxiety, and helplessness. Witnessing birth complications or adverse events may cause immediate and long-term anxiety and stress. In turn, this experience can impact on men’s sense of self and identity as a man and father and can affect his relationship with his infant and partner. The aim of this study was to explore the immediate and longer-term impact of witnessing a complicated or adverse birth experiences on men in heterosexual relationships and their role as a father.MethodsAn interpretive qualitative approach informed the design of this study. A total of 17 fathers, one from New Zealand and sixteen from Australia participated through face to face, telephone and email interviews. The ages of the men were between 24 to 48 years, and the time since the adverse birth experience ranged from 4.5 months to 20.5 years.FindingsThematic analysis revealed three major themes representing men’s experiences of witnessing a complicated birth or adverse event; ‘Worst experience of my life’, ‘Negotiating my place: communicating with health professionals’ and ‘Growing stronger or falling apart’. Men were unprepared and feared for the lives of their infants and partners, they expected and wanted to be involved in the birth and the maternity care journey, instead they were pushed to the side and excluded from the labour and birth during times of emergency. Being excluded from part or all of the birth perpetuated worry and vulnerability as, at times, men were left not knowing anything about what was happening to their partners. Midwives and other health professionals’ support was important to the way fathers adjusted and processed the complications of the labour and birth event. This experience impacted on their own mental health and their relationship with their baby and partner.ConclusionFindings demonstrate that following a complicated or adverse birth experience, men questioned their role as a father, their place in the family and their role at the birth. There is a need to include and inform the expectant father that help is available if they experience negative feelings of hopelessness or despair. Maternity services and care providers need to involve fathers so that they feel part of the maternity care system and journey which may mitigate feelings of helplessness.     

对"出口导向"和"进口替代"两种外贸发展战略的再认识

本文对进口替代和出口导向两种外贸战略进行了分析,认为我国应该充分利用大国的优势,立足于国内需求,降低对外依存度,同时应根据经济全球化的内在要求积极与世界经济接轨,实施进口替代与出口导向相结合的外贸战略,以成功应对经济全球化的挑战。     

中国人口年龄结构变动对出生率的影响研究

本文利用相关年份的《中国统计年鉴》和人口普查数据,根据粗出生率与总和生育率的关系与特征,构建了人口年龄结构系数及其对粗出生率变动影响的贡献率指标,分析了建国以来人口年龄结构变动对出生率的影响。研究发现：1949—1979年,人口年龄结构变动对出生率的影响很小;1980—1993年,人口年龄结构变动对出生率的影响迅速上升,年龄结构的贡献率增大;1994—2008年,人口年龄结构变动对出生率的影响趋于下降,人口惯性势能在减弱;2009—2011年,受80—90年代出生高峰的影响,人口年龄结构变动对出生率的影响再次凸显,年龄结构的贡献率迅速增大。从年龄别生育率逐年下降的特点,也可以证明近年推动我国人口增长的力量主要是由于年龄结构带来的惯性增长。     

社会经济发展与男孩偏好的淡化

本文利用2010年中国人民大学育龄妇女家庭与生育状况调查数据,对男孩偏好弱化现象及导致男孩偏好弱化的社会经济因素进行了研究。研究发现,农业技术和生产工具的进步、农村家庭收入来源中非农收入比例的提高、男孩较高的养育成本、社会保障的完善和人口流动性的增加所导致的人们对“养儿防老”预期的降低以及住房、交通条件的改善等一系列社会经济变化的共同作用,使人们的男孩偏好逐步淡化。     

Estimating the Size of a Subdomain: An Application in Auditing

This article suggests an alternative to the ratio estimator for estimating the total size of a subdomain of a population. The application that served as the genesis for this work is from auditing. The problem is to estimate the total of sales transactions that are not tax exempt from an audit sample of the population of nontaxed sales transactions. A superpopulation approach, which models the unit's probability of belonging to the subdomain as a function of its size, leads to a family of estimators. The simplest member of this famiiy is one in which that function is specified to be a constant. The optimal estimator for this model performs markedly better than the ratio estimator when the assumption is true and often performs better when it is not, though in that case it is biased. Stratification is shown to reduce this bias and at the same time make the ratio estimator more similar to the optimal estimator. A simulation experiment shows that the theoretical advantages hold in a real audit population.