关于α-预不变凸函数的择一性定理

本文在引入α-预不变凸函数的基础上,讨论了在优化中起重要作用的择一性定理．     

Schools as sanctuaries: A systematic review of contextual factors which contribute to student retention in alternative education

Early school leaving is an international concern. Previous research indicates that the school context contributes to early school leaving. This systematic review is aimed to gather marginalised young peoples’ perceptions concerning contextual factors that contributed to and interfered with their decisions to stay in alternative education. Twenty-three databases and reference lists of reviews were searched, eliciting 1586 studies, which were then screened. Data from 24 mixed-methods studies that met the inclusion criteria were extracted and synthesised. Findings suggested that alternative schools which provided a sanctuary for students increased student engagement. Schools were sanctuaries when they offered physical, emotional and psychological safe spaces; fostered a sense of community; enabled students to affirm their racial/ethnic pride and employed flexible behavioural supports. Implications for practice and research are discussed.     

村落别名故事的民俗学研究——以庙头镇八村为例

民间文学是一个民族的历史、宗教、信仰、伦理、民俗等留有先民的心理痕迹和经验残余的语言符号,是一个族群的心理生活和现实生活在历史的进程中不断出现和逐渐演化的产物的记载。民间故事总是根植于一定的民俗文化背景中,具有立体性、多面性的特点,是一种特定的民俗符号,从它们身上可以找到当地民众的物质生产活动和精神生活。通过对全州县庙头镇的八个村落的别名来源考察和文化生态环境的分析,从而揭示出其中所蕴含的民俗意蕴。     

论美国保护预备被监护人权益的基本原则

预备被监护人是指即将被安排监护的当事人。经过十余年改革,美国成年监护制度形成了保护预备被监护人权益的一系列基本原则。这些原则包括：“实质性损害”标准、最小限制性替代措施、“功能性行为能力”标准、正当程序原则。我国成年监护制度立法理念相对落后,借鉴美国的成功经验来重构和完善我国的成年监护制度具有重要意义     

论当前中国文艺理论发展的问题与出路

当前中国文艺理论的发展,主要存在学术意识、问题意识、世界意识与创新意识缺乏等四方面的问题,针对这些问题,中国文论的进一步发展,必须立足于当代中国文论发展的现实语境,破除非此即彼的二元对立思维模式与唯我一元独尊观念,并消除对现代性的曲解与狭隘理解,确立＂可选择的现代性＂这一现代性追求的文论发展与研究的新路向,从而为中国文论的现代转型与创新发展提供出路。     

试论媒介融合视域下中国“政员微博”的兴起及其发展模式

媒介融合作为政治民主化、经济全球化、社会信息化的必然发展趋势,对当代的社会生活都产生了巨大的影响。随着日益强化的“三网融合”的全媒体时代的到来,“微博现象”已成为互联网中不可或缺的一部分。而“政员微博”作为微博队伍中重要的一支,越来越彰显其特有的价值。与传统传播渠道相比,“政员微博”具有独特的优越性。在“双向性互动”,去“中性化受众”以及作为新兴的传播工具无疑具有重大的意义。但“政员微博”也存在着不足,加强“政员微博”中主体和客体的媒介素质,并形成一种替代传播模式,即“信源一媒介一信源”,应成为引导“政员微博”的健康发展的方向。     

A cross-sectional examination of the physical fitness and selected health attributes of recreational all-terrain vehicle riders and off-road motorcyclists

Abstract

The aims of this study were: (1) to characterize selected fitness and health attributes of two types of habitual recreational off-road vehicle riders – off-road motorcyclists and all-terrain vehicle riders; (2) to explore differences among riders in terms of vehicle type, age, and gender; and (3) to compare the fitness and health of riders to population norms and clinical health standards. Canadian off-road riders (n = 141) of both sexes aged 16 years and over were recruited through local and national off-road riding organizations. Anthropometry, fitness, and health measures of off-road motorcycle and all-terrain vehicle riders were compared with population norms, health standards, and physical activity guidelines. Off-road motorcycle riders had above average aerobic fitness (79th percentile), while all-terrain vehicle riders were lower than average (40th percentile). All riders had a healthy blood lipid profile and a low incidence of the metabolic syndrome (12.9%) compared with members of the general population. Off-road motorcycle riders had healthier body composition and fitness than all-terrain vehicle riders; however, the body composition of off-road motorcycle riders was no healthier than that of the general population and all-terrain vehicle riders were worse than the general population. Off-road motorcycle riders had healthier anthropometry and fitness than all-terrain vehicle riders and thus fewer health risk factors for future disease, demonstrating that the physiological profiles of off-road riders are dependent on vehicle type.     

Future Girls,transcendent femininities and new pedagogies: toward girls' hybrid bodies?

Media provides a material site for girls' identity formation and presents conflicting images of femininity, which challenge young women's self-expression and physicality development. The ‘problem’ with girls' physicality has not been resolved, but rather complicated by discourses of new femininities in sport, fitness and health promoted by the new economies. Girls' conscious and unconscious consumption of messages of new powerful femininities might be troubling for some girls, especially ‘Other’ girls and/or girls ‘at risk,’ whose physicality collides with the emerging image of the new girls. Therefore, in this paper, I contend that an investment in the third-wave feminist agenda is still necessary to engage scholars, educators and girls in critical conversations about media, genders, the body and identity. To this end, first I discuss the feminist reappraisal of Foucault's analysis of the body as an emancipatory socio-educational and political project for (en)gendering research on the feminine ‘docile body’ in society. Second, I highlight emerging contemporary monocultural discourses of the ‘Alpha Girl’ and the ‘Future Girl,’ powerful sporty, fit and healthy femininities that contradict discourses of the traditional feminine docile body, and I analyze the ways these new images subsume race, class, religion and disability. Finally, I conclude this article by advocating the adoption of critical media pedagogies as a potential strategy for schooling girls' hybrid bodies.     

An Investigation of Effectiveness of Conceptual Change Text-oriented Instruction on Students' Understanding of Solution Concepts

This study investigated the effect of conceptual change text-oriented instruction over traditional instruction on students' understanding of solution concepts (e.g., dissolving, solubility, factors affecting solubility, concentrations of solutions, types of solutions, physical properties of solutions) and their attitudes towards chemistry. The sample of this study consisted of 87 undergraduate students from two classes enrolled in an introductory chemistry course. One of the classes was assigned randomly to the control group, and the other class were assigned randomly to the experimental group. During teaching the topic of solution concepts in the chemistry curriculum, a conceptual change text-oriented instruction was applied in the experimental group whereas traditional instruction was followed in the control group. The results showed that the students in the experimental group performed better with respect to solution concepts. In addition, it has been found that there was no significant difference between the attitudes of students in the experimental and control groups towards chemistry.     

《搜神记》同义变换的主要途径

同义变换分析是对两种或两种以上的言语形式(语音、词语、句子、句组和篇章)之间可能存在的变换关系进行修辞个案分析的一种研究方法。本文以晋代志怪名著《搜神记》为研究对象,拟从同义变换的主要途径探讨《搜神记》同义修辞的内部规律。