排序方式： 共有31条查询结果，搜索用时 15 毫秒
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科技信息的开放获取已成为影响学术信息交流与科学发展的重大问题，深刻地影响到科技政策、科技支撑环境发展战略和科技信息服务模式。一大批科学家、科研机构和许多国家的科学管理与科研资助机构，都积极地推动科技信息的开放获取。他们或者制定开放获取政策、要求或鼓励科研人员提供科研成果的开放获取，或者支持开放出版期刊，或者建立机构开放存储库、支持本机构科研成果开放获取。通过这一系列的措施，科学界希望能够促进科研成果不受限制地广泛传播和自由获取、以及促进科研成果通过公共机制长期可靠保存和利用，以保障科技知识资产的国家保护和科研机构的知识资产管理。 相似文献
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Rich Ling Johannes Bjelland Pål Roe Sundsøy Scott W. Campbell 《The Information Society》2014,30(4):282-291
This article examines how we use mobile telephony to maintain our physically and socially closest social circle. The analysis is based on traffic data gathered from Norway using approximately 24 million calls and texts made by private individuals. Previous research has shown that our temporal and spatial movement is highly predictable and that the majority of calls and text messages are sent to only four to six different persons. This article extends this research by examining both tie strength and the distance between the interlocutors in urban and rural settings. The findings show that even as information and communication technologies (ICTs) potentially put the world at our fingertips, the mobile phone is an instrument of a more limited geographical and social sphere. Approximately two-thirds of our calls/texts go to strong ties that are within a 25-km radius. 相似文献
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Children: Ethnic and Political Violence-a Commentary 总被引：2，自引：0，他引：2
The articles in this special section add significantly to our knowledge about the impact of ethnic and political violence on children. At the same time, these studies also illustrate some of the problems in this area and, in particular, draw attention to the many methodological difficulties researchers face in this domain. In this commentary, the authors consider both the contributions and limitations of the investigations included in this section, and make suggestions as to how the field may advance in the next decade. 相似文献
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In the educational sciences, many discussions on the use of computer games occur. Most of the scientists believe that traditional computer games are time-consuming software and that game-playing activities negatively affect students’ academic performance. In this study, the accuracy of this general opinion was examined by focusing on the real game-playing scores of an elementary school students in Turkey. First, researchers selected a single-player strategy game. Second, the selected game was given to 105 fifth-grade students, who had not played it before, so that they could play it over a 30-minute period. The most successful student of the group finished the 23rd level of the game and collected 8152 points in total. In order to investigate the correlation between strategy game performance and academic performance, researchers derived the students’ average exam scores for six different courses (mathematics, physical science, science and technology, visual arts, music, and social sciences) from official documents. At the end of the study, it was found that participants’ mathematical or physical science skills were positively correlated with game success; however, a negative relationship was not exists between an individual's computer game success and academic performance. 相似文献
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Seon-Kyoung An Llewyn Elise Paine Jamie Nichole McNiel Amy Rask Jourdan Taylor Holder Duane Varan 《Mass Communication and Society》2014,17(2):195-216
The study at hand employed a pre- versus posttest experimental design to test the effects of television drama Switched at Birth on viewers’ attitudes toward deafness. This program tells the story of two teenage girls (one of whom is deaf) and their struggles to relate to their peers and families after discovering they were switched as newborns. Two hundred eleven female adults completed pre- and postexposure measures utilizing Cooper, Rose, and Mason's (2004) Attitudes to Deafness measure, the items of which were categorized according to thematic dimensions. After exposure to one of three episodes, viewers’ attitudes toward deafness significantly improved overall, although significant differences in attitude changes varied by episodes and dimensions. The three thematic dimensions that were most strongly represented in the program (social interaction, deafness as a handicap, and language issues) appeared to show the strongest attitude change. Positive attitude changes were observed on social interaction and deafness as handicap dimensions, which was consistent with program content depicting positive deaf-hearing friendships and capable deaf characters. However, attitudes on the language issues dimension showed a negative shift, possibly due to the way that deaf characters communicated with hearing characters onscreen. 相似文献
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城市商业性房屋拆迁是一个敏感而又被社会普遍关注的话题。地方政府、拆迁人、被拆迁人在城市商业性房屋拆迁中,为了各自的利益表现各有不同,导致诸多影响社会稳定的事件发生。我国城市商业性房屋拆迁出现问题的关键是地方政府角色混乱,行政权违法或不当行使。为规范城市商业性房屋拆迁,法律、法规应严格区分公益性拆迁和商业性拆迁,通过制定城市房屋拆迁法律程序来规范地方政府的行为,控制地方政府行政权的行使。如果地方政府在城市商业性房屋拆迁中能正确履行职责,本着问政于民,让利于民,切实从人民利益出发,会发现拆迁本来可以很和谐。 相似文献
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2008年8月8日晚,第29届奥林匹克运动会在北京拉开序幕。辉煌的古都烟花绚烂,激情放飞。这是一个万众瞩目的日子,全世界的热情目光聚焦中国,炎黄子孙的百年梦想化为现实。这一刻,全球华夏儿女为北京自豪,为奥运喝彩! 相似文献
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This study examined the contribution of word decoding, first-language (L1) and second-language (L2) vocabulary and prior topic
knowledge to L2 reading comprehension. For measuring reading comprehension we employed two different reading tasks: Woodcock
Passage Comprehension and a researcher-developed content-area reading assignment (the Global Warming Test) consisting of multiple
lengthy texts. The sample included 67 language-minority students (native Urdu or native Turkish speakers) from 21 different
fifth grade classrooms in Norway. Multiple regression analyses revealed that word decoding and different facets of L2 vocabulary
explained most of the variance in Woodcock Passage Comprehension, but a smaller proportion of variance in the Global Warming
Test. For the Global Warming Test, prior topic knowledge was the most influential predictor. Furthermore, L2 vocabulary depth
appeared to moderate the contribution of prior topic knowledge to the Global Warming Test in this sample of language minority
students. 相似文献