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   614篇
  免费   8篇
教育   458篇
科学研究   36篇
各国文化   11篇
体育   48篇
文化理论   2篇
信息传播   67篇
  2022年   4篇
  2020年   6篇
  2019年   22篇
  2018年   25篇
  2017年   27篇
  2016年   26篇
  2015年   17篇
  2014年   17篇
  2013年   144篇
  2012年   13篇
  2011年   19篇
  2010年   6篇
  2009年   17篇
  2008年   13篇
  2007年   5篇
  2006年   15篇
  2005年   12篇
  2004年   12篇
  2003年   10篇
  2002年   6篇
  2001年   19篇
  2000年   4篇
  1999年   8篇
  1998年   3篇
  1997年   11篇
  1996年   12篇
  1995年   8篇
  1994年   5篇
  1993年   5篇
  1992年   9篇
  1991年   13篇
  1990年   7篇
  1989年   6篇
  1988年   8篇
  1987年   2篇
  1986年   7篇
  1985年   6篇
  1984年   4篇
  1983年   4篇
  1981年   7篇
  1980年   9篇
  1979年   2篇
  1978年   4篇
  1977年   3篇
  1976年   5篇
  1975年   3篇
  1974年   4篇
  1973年   5篇
  1968年   2篇
  1934年   2篇
排序方式: 共有622条查询结果,搜索用时 15 毫秒
31.
Policy makers take initiatives to stimulate knowledge ecosystems in technology hotspots. It is implicitly assumed that these ecosystems will lead to value networks through which the participating companies can realize a competitive advantage. Value networks refer to business ecosystems where the value proposition is offered by a group of companies which are mutually complementary. The strategy literature suggests that business ecosystems lead to competitive advantages for each of the partners in the ecosystem. Based on a unique hand-collected database of 138 innovative start-ups in the region of Flanders, we analyze the knowledge and business ecosystem and the financial support network. We find that the knowledge ecosystem is well structured and concentrated around a number of central actors while the business ecosystem is almost non-existent at the local level. Further, we find that the financial support network is almost 100% publicly backed and fails to bridge the knowledge and business ecosystem. The implications for policy makers who tend to focus on the development of local ecosystems are discussed.  相似文献   
32.
OBJECTIVE: This study compares homeless women who had childhood histories of foster care or other out-of-home placement to those who have not. METHOD: A countywide probability sample of homeless women (n = 179) received structured interviews. RESULTS: One-third of homeless women reported being raised apart from their parents. Among women with children under age 18, most (61.5%) had children who had lived in foster care or other out-of-home placements. Variables associated with homeless mothers' children living in foster care or other out-of-home placements were: Child was school-age, mother was age 35 or older, mother had a current alcohol or drug use disorder, mother experienced childhood sexual abuse, and mother ran away from home (when under age 18). CONCLUSIONS: Parenting is difficult for homeless mothers who may need to place their children with others to facilitate school attendance. Parent-child interaction may be problematic in family shelters where privacy is rare. Thus, programs promoting family preservation for homeless mothers should provide parenting support as well as permanent housing.  相似文献   
33.
34.
Jannet A. Wright and Myra Kersner, senior lecturers in the Department of Human Communication Science, University College London, consider the practical implications of recent policies for teachers and speech and language therapists working together in inclusive settings. Their conclusions complement McCartney's ideas in the previous article.  相似文献   
35.
36.
37.
38.
In this article, Anne-Marie Wright, lecturer at the University of Chester, considers the current situation for students with severe learn i n g difficulties in general colleges of further education. She presents findings from a critical review of the literature and a small-scale preliminary investigation which set out to explore the idea that, despite radical changes to the special school sector and to the structure and organisation of further education, provision in colleges of further education for these students is poorly focused. Students with severe learning difficulties experience provision that is, at best, circuitous and repetitive and that, at worst, leads individuals back into dependence, unemployment and social segregation. Using the outcomes of her own interviews and the scrutiny of inspection reports, Anne-Marie Wright provides a searching critique of current practice and an interesting set of recommendations for ways in which the situation could be radically reviewed and improved.  相似文献   
39.
40.

Objective

This study investigated the long-term effects of exposure to intimate partner violence in the home on adolescent violence and drug use and gender differences in these relationships. Although the general relationship between exposure to IPV and negative outcomes for youth has been demonstrated in past research, gender differences in the effects of IPV on adolescents have been rarely assessed using longitudinal data.

Methods

Longitudinal data was obtained from 1,315 adolescents and their primary caregivers participating in the Project on Human Development in Chicago Neighborhoods (PHDCN). The sample was 51% female and ethnically diverse (45% Hispanic, 37% African-American, and 14% Caucasian). Two waves of data were assessed to examine the effects of exposure to IPV, reported by caregivers when their children were aged 12 and 15, on violence and drug use, reported by adolescents 3 years later. Multivariate statistical models were employed to control for a range of child, parent, family, and neighborhood risk factors.

Results

Exposure to IPV did not significantly predict subsequent violence among males or females in multivariate analyses. IPV exposure was significantly related to the frequency of drug use for females but did not predict drug use among males. This gender difference was not statistically significant, however, which suggests more similarities than differences in the relationship between exposure to IPV and subsequent violence and drug use.

Conclusions

This study supports prior research indicating that exposure to IPV can negatively impact adolescent development, but it suggests that these effects may be more likely to influence some outcomes (e.g., drug use) than others (e.g., interpersonal violence). The findings also emphasize the need for additional research examining the overall impact of IPV on adolescent problem behaviors and gender differences in these relationships, including longitudinal studies and investigations that control for a range of other important predictors. A better understanding of these relationships can help inform intervention efforts aimed at ensuring that adolescents living in violent households receive timely and appropriate services to help prevent the occurrence of future problem behaviors.  相似文献   
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