Child‐Care Usage and Mother‐Infant “Quality Time”

Mothers' time‐use patterns were compared in families in which infants spent more than 30 hours per week in child care (In‐Care group; n= 143) versus 0 hours per week (At‐Home group; n= 183) from birth to 6 months of age. In‐Care group mothers spent about 12 fewer hours per week interacting with their infants, for about 32% less time; fathers of these infants were more involved in caregiving. The groups did not differ in the quality of mother‐infant interaction. In the In‐Care group, quantity of interaction was related to greater separation anxiety and concerns about effects of maternal employment. Time‐use data were not related to child outcomes at 15 months of age. Results suggest that the effect of extensive time spent apart on the quantity and quality of mother‐infant interaction may be smaller than anticipated.     

论近代中国产业革命被窒息的原因--一个必须遵循先进生产力发展要求的历史实例

近代科学技术与民族棉纺织业私人资本结合是东方型产业革命兴起的直接导因.洋务运动使近代中国具备了产业革命兴起的可能性;但由于晚清政府不能代表当时中国先进生产力的发展要求,造成近代中国棉纺织业的发展走的是一条技术与资本相分离的道路,致使近代中国产业革命被窒息.     

邮政通信网络现代化建设的分析和对策研究

通过对我国邮政通信网现状及建设中存在问题的分析 ,探讨适合现代化邮政通信网发展的目标和原则 ,并从经济学角度 ,提出加快邮件传递时限、建设信息系统、发展业务和培育市场等完善邮政通信网建设的可行性建议     

英语成绩与焦虑特性的相关性研究

文章以南华大学外国语学院英语专业二年级 4 4名本科生为对象 ,用SPSS统计软件包分析研究了学生英语成绩及若干专业技能与焦虑特性的相关性。研究结果表明 :( 1)学生英语成绩与焦虑特性呈中度负相关 ;( 2 )在听写、听力、阅读、写作这四项单项能力方面 ,听写和听力是与焦虑特性相关性最高的两个 ,而完形填空、词汇与结构与焦虑特性不相关。     

非英语专业学生在英语学习中情感障碍特征分析

外语教学和外语学习的成功取决于诸多因素 ,其中情感因素越来越受到研究者和外语教师们的重视。笔者以 2 88名非英语专业本科生为对象 ,通过问卷调查 ,从焦虑、自信和动机三个方面来分析非英语专业大学生在英语学习中情感障碍特征及其表现 ,以便为探索能降低学生情感障碍的教学方法提供依据     

Missing data and forecasting in multivariate time series: An application of the common components dynamic linear model

Summary The paper deals with missing data and forecasting problems in multivariate time series making use of the Common Components Dynamic Linear Model (DLMCC), presented in Quintana (1985), and West and Harrison (1989). Some results are presented and discussed: exploiting the correlation between series, estimated by the DLMCC, the paper shows as it is possible to update state vector posterior distributions for the unobserved series. This is realized on the base of the updating of the observed series state vectors, for which the usual Kalman filter equations can be applied. An application concerning some Italian private consumption series provides an example of the model capabilities.     

奇异的自尊心--对张爱玲《红玫瑰与白玫瑰》的症候式分析

《红玫瑰与白玫瑰》是张爱玲作品中的一个独特的文本。文本外的隐性内涵以及人物背后相对的精神观照是被以往评论者所忽视的。张爱玲不与人道的情感世界以及其独特的人格精神通过“移情”和“逃避焦虑”无意识地发泄于文本中 ,这一切都可以通过症候式分析获得     

跨文化交际中的时空观念差异

不同文化背景的人,由于受不同文化传统的影响,其思维方式不同,在人际交往中的时间观念(如时间顺序排列、时间取向、遵守时间的态度)和空间观念(如对体距的认识、对个人领地的态度等)也存在差异。这些差异往往容易被人们忽视,从而影响交际的正常进行,甚至导致交际的失败。因此,在交往中我们应该正确对待文化差异,自觉排除文化差异的干扰。     

论英语教学中情感因素现状及对策

情感因素对外语教学具有重大的影响。目前我国大学英语教学中片面强调重知识传授而轻情感交流,学生表现焦虑紧张、课堂氛围沉闷单调,缺乏自尊自信心理,应关注学生情感因素,坚持以学生为中心,保护学生自尊情感,关注学生心理调适,激活学生情感力量,创造和谐情感气氛。     

Sampling Returns for Realized Variance Calculations: Tick Time or Transaction Time?

This article introduces a new model for transaction prices in the presence of market microstructure noise in order to study the properties of the price process on two different time scales, namely, transaction time where prices are sampled with every transaction and tick time where prices are sampled with every price change. Both sampling schemes have been used in the literature on realized variance, but a formal investigation into their properties has been lacking. Our empirical and theoretical results indicate that the return dynamics in transaction time are very different from those in tick time and the choice of sampling scheme can therefore have an important impact on the properties of realized variance. For RV we find that tick time sampling is superior to transaction time sampling in terms of mean-squared-error, especially when the level of noise, number of ticks, or the arrival frequency of efficient price moves is low. Importantly, we show that while the microstructure noise may appear close to IID in transaction time, in tick time it is highly dependent. As a result, bias correction procedures that rely on the noise being independent, can fail in tick time and are better implemented in transaction time.