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Extracting policy-relevant information from large national surveys of educational achievement is ordinarily a nontrivial task. It is made more treacherous when the data are expressed on scales that are not uniquely determined. The paper begins with a critical analysis of a recent attempt to interpret the findings on reading achievement obtained by the National Assessment of Educational Progress (NAEP). It then describes a new approach to the quantification and interpretation of change and demonstrates its appropriateness for repeated cross-sectional designs such as NAEP. Limitations imposed by the survey design and the nature of the measurements are highlighted  相似文献   
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Tibor Mende 《Prospects》1974,4(2):198-204
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Conclusion In this paper we briefly described the current status of research in the field of digital libraries interoperability, mainly with respect to federated data processing such as permitted within the Open Archive Initiative framework. We then presented the CERN Document Server Software suite that is a free software package main-tained by CERN providing an online digital library solution for mid- to large-sized document repositories. The set of CDSware modules was described and the differ-ences with other existing tools briefly mentioned. Finally we have mentioned a typical usage statistics illustrating the scope of grey literature and networked con-ditions of the CERN Document Server. We pointed out that the current trend in grey literature management goes toward institutional repositories build upon the distributed and federated model. Further research is going on within the CDS collaboration in this area, focused particularly on (i) semantic interoperability using ontologies in distributed and federated data processing and (ii) ranking technologies when searching grey literature in OAI compliant repositories.  相似文献   
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We conducted surveys of adults participating in municipally sponsored volunteer events in the Portland, OR metropolitan area in order to understand the range of attitudes and behaviors associated with volunteer work. We sampled 172 individuals in 18 events from February to June 2012. Principal components and factor analyses of survey responses identified three groups based on annual frequency of participation in stewardship events: first-time volunteers, mid-level volunteers (3–10 events per year), and frequent volunteers (>10 events per year). Our analyses revealed three main factors that explained the variation in survey response for the three volunteer groups: environmental identity, private pro-environmental behavior, and civic engagement. All three factors were positively correlated with frequency of participation in stewardship events, with the most frequent volunteers indicating the highest degree of attention to environmental issues, environmental identity, and self-reported pro-environmental behaviors. Frequent volunteers were more likely to feel personally attached to their local environment, believe that their efforts help solve environmental problems, and enjoy being part of community efforts. These results suggest that stewardship activities provide opportunities for volunteers to interact with others while working collectively toward restoring and maintaining parks, which may contribute to more resilient communities.  相似文献   
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In the time between its founding and the fall of the wall in November 1989, more than three million people left the German Democratic Republic, many of them illegally and under dangerous circumstances. The party leadership perceived this mass exodus of its citizens as one of the major threats for the real socialist regime.1?1. Bispinck Bispinck, Henrick. “Republikflucht. Flucht und Ausreise als Problem der DDR-Führung.” Vor dem Mauerbau. Politik und Gesellschaft der DDR in den Fünfziger Jahren, edited by MichaelSchwartz and Hermann Wentker, 285309. München: Oldenbourg Wissenschaftsverlag, 2003. [Google Scholar], “Republikflucht.”‘Republikflucht’, as this move from East to West was called by the party leadership, was the reason for the two most important hiatuses in Eastern German history: the first result was that the SED leadership built the wall in August 1961. Many years later, in the fall of 1989, the situation culminated, when a flood of desperate refugees tried to escape to the Federal Republic of Germany via Hungary, Poland and Czechoslovakia, thus effectively hurrying along the regime's demise. The world of sports, too, was considerably affected by this phenomenon. The following essay shall offer a short historical summary of the different reasons and routes Eastern German top athletes chose for their escape. Examples from various decades show that in spite of individual circumstances certain similarities in pattern can be made out, especially in respect to the way the government dealt with these cases of ‘treason’.  相似文献   
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Dietmar Braun 《Minerva》2012,50(4):471-491
This article improves our understanding of the reasons underlying the intellectual migration of scientists from existing cognitive domains to nascent scientific fields. To that purpose we present, first, a number of findings from the sociology of science that give different insights about scientific migration. We then attempt to bring some of these insights together under the conceptual roof of an actor-based approach linking expected utility and diffusion theory. Intellectual migration is seen as the choice of scientists who decide under uncertainty and on the base of estimations about probabilities, costs, and benefits of the migration. The resulting choice model can be used as a heuristic base for further exploration of the subject.  相似文献   
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