母语负向迁移与英语写作

任何学习过程都有迁移现象 ,母语的负向迁移对英语学习 ,尤其是英语写作的影响非常明显 ,涉及范围较广 ,从词汇到句法 ;从句子到篇章 ;从思维到文化。值得在英语写作教学中深入研究     

中国大学生拒绝邀请的礼貌策略

语言中的性意识是一种普遍存在的现象 ,它蕴含着语言使用者的文化心理、社会价值取向 ,并反映出社会规范与民俗心态。对中国大学生拒绝邀请的礼貌策略的性别差异的调查和研究 ,支持了为 Brown和 L evinson的关于消极礼貌和面子威胁行为的观点 ,暗示中国社会是一个注重消极礼貌的社会     

外部性:政府采购立法研究的新视角

政府采购法的立法常常给他人带来非自愿的成本或收益,即政府采购法的外部性。政府采购法的外部性,导源于现代社会政府采购立法的决策过程、政府采购立法所拥有的“派生的外在性”以及政府采购立法过程的信息缺失。内在化政府采购法的外部性,须明确界定中央与地方之间、国务院各部门之间的政府采购的立法权,完善政府采购立法程序以及建立政府采购立法损害补偿制度等。     

英语非情态性一般否定句的认知研究和翻译方法

英语否定句覆盖面很广,所以翻译英语否定句也是一个重要的问题。在英语所有否定句中,带有情态动词的否定句（即情态性否定句）,由于受情态动词的语义限定,一般比较容易翻译;而翻译不带情态动词的否定句却比较困难,这里涉及到许多因素。文章重点研究英语非情态性一般否定句的五种类型,并指出它们的顺译和倒译方法以及应该注意的问题。     

网络丧文化视角下青少年负面情绪表达及意识形态隐忧

网络丧文化是折射当代青少年心态和境遇的一面镜子,其中裹挟的负面情绪是网络时代值得关切的传播症候。网络负面情绪的兴起,是阶层固化导致的生存困境和时代变迁带来的社交孤独而引发的一场亚文化实践。在媒介技术的加持下,这场亚文化实践最终演变为情绪宣泄和自我满足的生活标签与符号意义。网络负面情绪呈现出颓废、迷茫、无病呻吟与多愁善感的叙事风格特征,具有三种现实意义：从个体角度,它是身份认同和价值认同的确认工具;从文化角度,它传递出对现实生活和主流文化的温柔抵抗;从经济角度,风格的实质是让受众沦为“数字劳工”,自由地、无偿地为商家提供“数字商品”并沉浸其中。作为一种网络亚文化现象,青少年负面情绪的过度传播潜藏着社会层面和个人层面的意识形态隐忧,通过外部涵化与主体自律等措施可以化解青少年网络丧文化的负面效应。     

Efficient Estimation of a Distribution Function under Quadrant Dependence

LetX₁,X₂, ..., be real-valued random variables forming a strictly stationary sequence, and satisfying the basic requirement of being either pairwise positively quadrant dependent or pairwise negatively quadrant dependent. LetF^ be the marginal distribution function of theX_ips, which is estimated by the empirical distribution functionF_n and also by a smooth kernel-type estimateF_n, by means of the segmentX₁, ...,X_n. These estimates are compared on the basis of their mean squared errors (MSE). The main results of this paper are the following. Under certain regularity conditions, the optimal bandwidth (in the MSE sense) is determined, and is found to be the same as that in the independent identically distributed case. It is also shown thatn MSE(F_n(t)) andnMSE (F^_n(t)) tend to the same constant, asn→∞ so that one can not discriminate be tween the two estimates on the basis of the MSE. Next, ifi(n) = min {k∈{1, 2, ...}; MSE (F_k(t)) ≤ MSE (F_n(t))}, then it is proved thati(n)/n tends to 1, asn→∞. Thus, once again, one can not choose one estimate over the other in terms of their asymptotic relative efficiency. If, however, the squared bias ofF^_n(t) tends to 0 sufficiently fast, or equivalently, the bandwidthh_n satisfies the requirement thatnh³_n→ 0, asn→∞, it is shown that, for a suitable choice of the kernel, (i(n) ?n)/(nh_n) tends to a positive number, asn→∞ It follows that the deficiency ofF_n(t) with respect toF^_n(t),i(n) ?n, is substantial, and, actually, tends to ∞, asn→∞. In terms of deficiency, the smooth estimateF^_n(t) is preferable to the empirical distribution functionF_n(t)     

Smooth tail-index estimation

The two parametric distribution functions appearing in the extreme-value theory – the generalized extreme-value distribution and the generalized Pareto distribution – have log-concave densities if the extreme-value index γ∈[?1, 0]. Replacing the order statistics in tail-index estimators by their corresponding quantiles from the distribution function that is based on the estimated log-concave density ? f _n leads to novel smooth quantile and tail-index estimators. These new estimators aim at estimating the tail index especially in small samples. Acting as a smoother of the empirical distribution function, the log-concave distribution function estimator reduces estimation variability to a much greater extent than it introduces bias. As a consequence, Monte Carlo simulations demonstrate that the smoothed version of the estimators are well superior to their non-smoothed counterparts, in terms of mean-squared error.     

基于消费者显著性偏好的双边平台转换成本和定价策略研究

针对消费者对转换成本和价格属性具有显著性偏好的实际情况，基于显著性理论对垄断双边平台企业的转换成本和定价策略问题进行了研究。研究发现：1)在显著性偏好非对称型市场上，对价格敏感的一方收取的价格最低，对高转换成本的一方收取的价格最高，而在显著性偏好对称型市场上，平台的最优价格位于非对称型市场之间，但是对价格敏感型市场收取的价格低于转换成本敏感型市场的价格。2)在高转换成本的市场，平台利润最低；低转换成本市场平台利润最高，而混合型情况的最优利润位于这两者之间。该研究结论说明平台企业应该采取措施来降低用户加入平台的转换成本，从而增加利润，这与现实的案例研究结论相吻合。     

Bounded risk estimation of a linear combination of location parameters in negative exponential distributions via three-stage sampling

The paper deals with the problem of bounded risk point estimation for a linear combination of location parameters of two negative exponential distributions. Isogai and Futschik considered the situation when the location and scale parameters are all unknown. They proposed purely sequential procedures and gave second order expansions of the average sample sizes and risks. In this paper we propose three-stage procedures and derive second order expansions of the average sample sizes and risks. Further, we compare the results with those from previous work.     

Teenage childbearing: young sole mothers challenge the stereotypes

Teenage sole mothers in receipt of welfare benefits are seriously affected by systematic and radical restructuring of Aotearoa/New Zealand’s state welfare system since 2008. With few exceptions, the changes oblige beneficiaries to prioritise obtaining paid work. To address questions of how welfare changes and socio-cultural context in Aotearoa New Zealand are experienced by teenage mothers we conducted a narrative study of 10 young women’s stories of sole mothering as beneficiaries. Purposeful sampling was used to recruit young mothers who were attending, or had recently attended a specialist school for teen parents. Thematic analysis of interview narratives represented experiences of financial and social deprivation, negative stereotyping, stigma and resistance. In contrast to the government’s explicit goal of getting welfare recipients into paid employment, the teenage mothers in our study placed full-time mothering as their principal duty. They also acknowledged the material and social advantages of entering paid employment, and were committed to working but only when their child was ‘settled and ready’ – a decision they understood to be their responsibility.