The ‘right time’ – negotiating the timing of interviews with vulnerable young people

Participant retention is a key factor in determining the success of longitudinal research. Challenges in re-locating and retaining participants over the long term are major issues for researchers working with young people who face adversity and experience frequent changes in circumstances. This article reports on a study of vulnerable young people and their transition into adulthood. Rather than the more conventional schedule-based approach to locating and re-interviewing young people, a relational process, the ‘right time’ framework, was used to facilitate young people's involvement in the study. Embedded in the ‘right time’ framework is recognition of the diverse and fluctuating circumstances that shape young people's availability for interviews. Several case examples are considered which amplify the way that the ‘right time’ framework allowed the research to navigate around these circumstances. The case examples highlight the value young people attached to being involved in the research, the influence on the ‘right time’ of wider relational tensions for young people and the need to negotiate researcher status as a different sort of adult. The ‘right time’ framework contributed to a high retention rate in the study generating a more representative sample and enhancing the subsequent data analysis by providing valuable insights into the lives of these vulnerable young people.     

基于评价理论的APEC领导人宣言分析

2005年到2014年的APEC领导人宣言中的评价资源以借言为主，正面评价突出，其中鉴赏资源丰富，语势较强，立场分明。这些既体现出对话的和谐，又表明了领导人的决心和信心。2014年的领导人宣言的特点是亚太国家成果众多且认可度更高，特别鼓励区域内，以及政府与私营企业的战略性合作。     

Heteroscedastic Global Tests that the Regression Parameters for Two or More Independent Groups are Identical

Simulation results are reported on methods that allow both within group and between group heteroscedasticity when testing the hypothesis that independent groups have identical regression parameters. The methods are based on a combination of extant techniques, but their finite-sample properties have not been studied. Included are results on the impact of removing all leverage points or just bad leverage points. The method used to identify leverage points can be important and can improve control over the Type I error probability. Results are illustrated using data from the Well Elderly II study.     

Data tilting for time series

Summary. We develop a general methodology for tilting time series data. Attention is focused on a large class of regression problems, where errors are expressed through autoregressive processes. The class has a range of important applications and in the context of our work may be used to illustrate the application of tilting methods to interval estimation in regression, robust statistical inference and estimation subject to constraints. The method can be viewed as 'empirical likelihood with nuisance parameters'.     

论早期新诗观念中诗艺和经验的紧张——以闻一多、梁实秋、俞平伯、康白情为中心

在早期新诗观念中，注重诗艺的表现和经验的表达分别体现在闻一多、梁实秋和俞平伯、康白情身上，他们之间的分歧源自于不同的诗歌观念系统，从诗艺和经验两个层面对他们展开探讨有益于理解早期新诗观念的复杂性。     

晋察冀边区的“三三制”村政权建设

村政权是抗日民主政权的基石。晋察冀边区经1938-1940年村政建设,广大乡村实现了由村长制到村民委员会制的过渡,大批抗日人士走上了村长的岗位。为推进全民族抗战和边区民主建政进程,1941年之后的晋察冀边区村选贯彻了"三三制"思想,在更加扩大的民主范围和统一战线的基础上进行村政建设。村级抗日民主政权的"三三制"建设,表明中国共产党人政权观日渐成熟。它适应了全民族总动员的抗日斗争的客观需要,适应中国社会阶级构成"两头小中间大"的国情,使各抗日阶级、阶层、党派代表进入基层抗日民主政权的领导,行使议政从政的权利,促进了乡村社会治理,从而极大地激发了乡村民众的抗日救国积极性,为夺取抗日战争的胜利发挥了十分重要的作用,为解放区和新中国成立后村政建设积累了经验,树立起了"模型"。     

“健康丝绸之路”构建的“政府—社会”复合路径

借鉴社会运动理论,可探索一种融合了政府自上而下和社会自下而上进程的“政府—社会”复合路径,以构建“健康丝绸之路”。社会运动理论的三种视角可为这种复合路径的具体实施与需要关注的环节带来重要启发：首先,当前新冠肺炎疫情的跨国传播暴露了全球公共卫生治理体系存在的严重不足,凸显出构建补充型国际卫生合作模式的必要性与紧迫性;其次,推进“健康丝绸之路”的构建,需要政府和社会层面的协作,将“一带一路”沿线国家的资源充分调动起来,形成优势互补与资源共享。与此同时,要推进健康话语体系的完善,如倡导和促进“人类卫生健康共同体”理念的传播,通过话语和心理共鸣等民心相通的途径,促使国际社会采取联合行动以共同应对全球公共卫生危机。     

半导体激光器的光学准直

对半导体激光器进行光学准直是空间光通信系统必须进行的重要工作。文中简述了准直通常使用的方法,测试了使用单透镜对一种３５ｍＷ半导体激光器的准直结果,准直效率约为６０％,准直后的发射角为０４～０７５ｍｒａｄ。     

休谟与启蒙运动——基于《人性论》引言的思想史考察

当前对休谟的研究常把他和启蒙运动相隔裂.通过对休谟代表性著作《人性论》引言的分析,可以发现他和法国启蒙思想家共享认识世界的“力学模式”和实验方法,都试图将当时在英格兰兴起的“自然哲学”应用于人类境况,都致力于用对人类生活有用的经验研究所产生的新理论代替传统形而上学.同时,休谟对经验主义方法自身的局限有着更为健全的认识,主张在经验和可观察现象范围内的实验方法.这一认识在我们反思启蒙时极富价值.     

Inference for quantile measures of kurtosis,peakedness, and tail weight

Insight into measures of peakedness, heavy-tailedness, and kurtosis can be gained by studying Ruppert’s ratios of interquantile ranges. They are not only monotone in Horn’s measure of peakedness when applied to the central portion of the population, but also monotone in the practical tail-index of Morgenthaler and Tukey, when applied to the tails. Non-parametric confidence intervals are found for Ruppert’s ratios, and sample sizes required to obtain such intervals for a pre-specified relative width and level are provided. In addition, the empirical power of distribution-free tests for peakedness and bimodality are found for some symmetric distributions.