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71.
Longitudinal associations between social preference, perceived popularity, and risk behaviors (smoking, alcohol use, and sexual activity) were examined in a sample of high school students. Social preference did not predict any of the risk behaviors assessed, although the interaction between gender and social preference was predictive of sexual behavior. Perceived popularity in Grade 10 was predictive of increased alcohol use and sexual activity in Grade 12 for both boys and girls. A reciprocal relationship was found for boys, in which smoking in Grade 10 also predicted gains in perceived popularity over time. Furthermore, results suggested that gains in perceived popularity may be associated with subsequent losses in social preference over time, lending support for the “cycle of popularity” observed by Eder. Implications are discussed, including the personal impact of risk behaviors on perceived popular teens, as well as the broader influence their behavior may have on their less popular counterparts.  相似文献   
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73.
Simple recursive constructions for cyclic block designs are given. These yield many new infinite families of cyclic Steiner 2-designs.  相似文献   
74.
The article argues from a Nordic, feminist and poststructuralist position that feminist state theories need to be developed methodologically. This claim is based on both theoretical arguments as well as empirical arguments arising from a case study on care politics in Denmark. In contrast to answering questions about the essence of the state, the aim of the article is to provide some analytical tools for studying the state. First, it focuses on two paradigms of feminist analyses of the state: differences between states (Nordic feminists), and differences within states (poststructural feminists). The article argues that each of the approaches has its merits and problems in terms of feminist engagements with the state. The second part explores an empirical case study on care politics in Denmark. The study illustrates the inadequacies of feminist approaches to the state to date. State discourses and policies on home-helpers are shown to have both empowering and disempowering effects on the women concerned. The third part of the article suggests a framework of three concepts believed to be helpful when analysing gender and the state: hegemony, contradictory effects and boundaries. The concepts are generated from the case study.  相似文献   
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Over a decade ago, knowledgebases entered the library marketplace as stand-alone products to facilitate electronic resource management and end-user access. Keeping pace with the increasing availability of electronic content, these systems have grown exponentially and have become integral components of electronic resource management and discovery product suites. This review article traces the evolution of knowledgebase systems and highlights recent initiatives to standardize and improve e-resource metadata. Looking to the future of electronic resource management, knowledgebase-centric systems not only have the potential to improve the automation of e-resource management tasks, they also can foster increased collaboration among libraries, thereby transforming how libraries work and provide services to end users.  相似文献   
77.
Abstract

The primary purpose of information services has always been and will always be to reduce to a minimum the amount of time required by local users to obtain access to that information they need to do their work.1  相似文献   
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