首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   100篇
  免费   3篇
教育   71篇
科学研究   13篇
各国文化   1篇
体育   5篇
信息传播   13篇
  2023年   1篇
  2022年   3篇
  2021年   1篇
  2020年   3篇
  2018年   5篇
  2017年   1篇
  2016年   4篇
  2014年   2篇
  2013年   19篇
  2012年   3篇
  2011年   2篇
  2010年   2篇
  2009年   3篇
  2005年   1篇
  2004年   2篇
  2003年   2篇
  2002年   2篇
  2001年   2篇
  2000年   2篇
  1999年   1篇
  1998年   1篇
  1997年   2篇
  1996年   2篇
  1995年   2篇
  1991年   2篇
  1990年   1篇
  1989年   2篇
  1988年   4篇
  1987年   5篇
  1986年   1篇
  1985年   3篇
  1983年   3篇
  1982年   2篇
  1981年   3篇
  1979年   3篇
  1977年   1篇
  1975年   1篇
  1974年   2篇
  1969年   1篇
  1968年   1篇
排序方式: 共有103条查询结果,搜索用时 15 毫秒
71.
The Next Generation Science Standards (NGSS) chat (#NGSSchat) is a social media-based professional network used to discuss topics related to the NGSS in the United States. While successful reforms involve and coordinate the work of multiple stakeholders, recent research points out a striking lack of coordination between the individuals working in different educational roles—to the detriment of intended changes in the system. In this study, we analyzed more than 7,000 posts from individuals participating in #NGSSchat on Twitter (n = 247) during 2 years of 1-hr synchronous discussions. We studied the depth and types of conversations that took place, the extent to which the involvement of teachers, administrators, researchers, and organizations was balanced, and what explains participation in the network over time. Using a mixed-methods approach involving social network analysis, we found that conversations were primarily transactional, or social, and substantive, or providing opportunities for sense-making about the standards or for participants to transform their practice and that individuals from diverse roles participated, with teachers comprising the plurality of those involved. Additionally, researchers, administrators, and teachers were the most active in the network, with no differences in both initiating, or sending, and being the recipients of, or receiving, replies as a part of conversations. Finally, we found that being a teacher or administrator, as well as receiving replies from individuals who were important in the network, were positively related to sustained involvement in the network in the following year. We discuss how #NGSSchat—as a social media-based professional network—demonstrates similar features in other effective networks, and how social media-based networks invite new visions for how to implement ambitious, large-scale changes in science education.  相似文献   
72.
73.
74.
Reference     
INSIDE U.S. BUSINESS: A CONCISE ENCYCLOPEDIA OF LEADING INDUSTRIES by Philip Mattera (Homewood, IL: Dow Jones-Irwin, 1987—price not given)

DICTIONARY OF COMPUTERS, INFORMATION PROCESSING & TELECOMMUNICATIONS by Jerry Rosenberg (New York: John Wiley, 1987—$18.95, paper, with a hardback available as well)  相似文献   
75.
OBJECTIVE: The purpose of this research was to investigate, within an at-risk population, parent and child characteristics associated with a mother's self-reports of severe physical assault and assault on the self-esteem of the child in the first 3 years of life. DESIGN: The study population consisted of a community-based sample of mothers of newborns identified as at-risk for child maltreatment (n=595). Families were assessed annually from the child's birth through age 3 using instruments with established psychometric properties. Independent variables investigated included: family socio-demographics, parity, mother's social support, maternal depression, maternal problem drug or alcohol use, partner violence, child's age, child's sex, low birth weight/small for gestational age (SGA), and mother's perception of child's demand level. Associations with maltreatment were examined using multivariable methods for longitudinal data. RESULTS: Child severe physical assault was significantly associated with parent characteristics (maternal depression and partner violence); and child characteristics (SGA). Assault to the child's self-esteem was significantly associated with maternal depression, maternal illicit drug use, partner violence and mother's perception of child's demand level. Controlling for family sociodemographic characteristics did not change the associations. Likewise, while mother's perception of child demand level had an independent association with self-esteem assault, the associations described above persisted while demand level was held constant. In this high-risk sample, abuse was not associated with mother's age, education, race, parity, or household income level. CONCLUSIONS: While characteristics such as SGA can serve as markers for increased abuse risk, they are not amenable to intervention after the child is born. However, certain other risk factors, such as maternal depression and domestic violence are malleable and should be targeted for intervention with the goal of preventing child maltreatment.  相似文献   
76.
Research on teachers’ use of social media has typically assumed that it is a) driven by a need for professional learning and b) best understood in terms of individual motivations. In this study, we use a dataset of nearly 600,000 tweets posted to one or more of 48 Regional Educational Twitter Hashtags associated with 44 U.S. states. To explore the influence of local contextual factors on hashtag- and account-level activity in these hashtags, we use an analytic approach heretofore uncommon in social media-focussed education research: generalised linear and multilevel modelling. At the hashtag level, higher numbers of teachers within a state, proportions of students receiving subsidised meals, student-to-teacher ratios, and amounts of state spending per child are associated with more activity within a regional hashtag; by contrast, more left-leaning state governments and citizenries are associated with less activity. At the account level, more experienced accounts and accounts in more right-leaning states contribute more tweets to these hashtags. These findings reinforce established understandings of Twitter as a site for teacher learning; however, they also underline the importance of acknowledging other important purposes of teachers’ Twitter use, including receiving emotional support and engaging in activism. Practitioner notes What is already known about this topic
  • Many teachers use Twitter (and other social media platforms) for professional purposes.
  • Teachers have identified professional learning—among other purposes—as motivating their use of Twitter.
  • Regional Educational Twitter Hashtags are diverse learning spaces for teachers and other education stakeholders.
What this paper adds
  • Local context and policy factors help influence teachers’ use of Twitter.
  • Teachers may turn to Twitter because of a lack of emotional or political support—not just a lack of material support or professional development opportunities.
  • Individual and idiosyncratic factors remain important in explaining teachers’ engagement with social media.
Implications for practice and/or policy
  • Informal spaces like social media may supplement formal support mechanisms for teachers.
  • Teachers’ use of social media may help administrators and policymakers identify existing gaps to be repaired in those formal support mechanisms.
  • Support for teachers should be conceived holistically and include emotional and political support.
  相似文献   
77.
78.
79.
Controlling access to the Internet by means of filtering softwarehas become a growth industry in the U.S. and elsewhere. Its usehas increased as the mandatory response to the current plagues ofsociety, namely, pornography, violence, hate, and in general,anything seen to be unpleasant or threatening. Also of potentialconcern is the possible limitation of access to Web sites thatdiscuss drugs, without distinguishing advocacy from scientificand informed analysis of addiction. With the rise of an effectivecreationist movement dedicated to the elimination of evolutionarytheory in the curriculum, it is to be expected that attempts willbe made to limit access to sites presenting such theories, incertain jurisdictions in the U.S. The current preferred method ofchoice to limit access is to filter content either by blockingaccess to specific Web sites, referred to by their URLs, or byusing a large set of keywords to prevent accessing sites thatcontain one or more of these words. Another more insidious schemeis to encourage or even require every Web site to rate itscontent along a number of dimensions, including violence,language, sexual explicitness, and nudity. Then individualbrowsers can be programmed to return references only to thosesites that fall below a pre-specified profile. The dangers forfree speech inherent in such schemes will be discussed. Effortsto produce legislation in the U.S. to mandate the use offiltering or rating programs will be described, as will somerecent court decisions involving their use in libraries.  相似文献   
80.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号