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   1435篇
  免费   317篇
  国内免费   73篇
  1825篇
  2025年   4篇
  2024年   35篇
  2023年   60篇
  2022年   65篇
  2021年   46篇
  2020年   101篇
  2019年   76篇
  2018年   98篇
  2017年   60篇
  2016年   71篇
  2015年   67篇
  2014年   95篇
  2013年   161篇
  2012年   60篇
  2011年   78篇
  2010年   36篇
  2009年   52篇
  2008年   82篇
  2007年   126篇
  2006年   83篇
  2005年   63篇
  2004年   50篇
  2003年   54篇
  2002年   39篇
  2001年   27篇
  2000年   26篇
  1999年   18篇
  1998年   17篇
  1997年   15篇
  1996年   19篇
  1995年   14篇
  1994年   7篇
  1993年   7篇
  1992年   9篇
  1989年   1篇
  1988年   1篇
  1987年   1篇
  1986年   1篇
排序方式: 共有1825条查询结果,搜索用时 0 毫秒
971.
SARS属中医"瘟疫"范畴.中药是以药性之偏来纠正人体之阴阳偏盛或偏衰,所以无论治疗还是预防用药,均应遵循中医学的因地、因时、因人制宜的辨证思想;并针对高危人群提出医护人员应当固护精气、老人注重补肾的预防用药思路.我们认为,清热解毒法为治疫常法,而非防疫常法,预防SARS应辨证用药.  相似文献   
972.
Hirschman's (1970 , 1993 ) theoretical constructs of Exit and Voice represent a useful way to think about citizenship. Exit refers to a desire to emigrate and can be construed as apolitical, private, and passive—a threat to citizenship—whereas Voice refers to political commitment and can be construed as ideal citizenship. A survey of 560 Bulgarian university students in 1998 explored their emphasis on Exit and Voice (as options for themselves in the future) and the association of each option with different economic, political, and psychological factors. One in four students wanted to emigrate, and half of them considered leaving the country for a period of time. Exit plans appeared mainly to be triggered by a wish to participate in the consumer culture, but were also associated with a critical view of the political system as well as a rejection of tradition in conjunction with a Western identity. Although most of the students shared vague or ideal Voice-related plans, few wanted to become actively involved in politics. An emphasis on Voice reflected not only a somewhat limited political engagement but also a more traditionalistic attitude associated with plans for a career and family. The findings indicate that a normative separation between Exit and Voice as theoretical concepts does not cover the complexities of the Bulgarian students' emigration and political involvement plans.  相似文献   
973.

Objectives

The topic of positive youth development through sport has received much research attention in recent years. However, a specific tool that measures this construct has yet to be fully developed. The purpose of this study was to test the factor structure of the Youth Experience Survey 2.0 (YES; Hansen & Larson, 2005) in a sample of youth sport participants; an instrument that was originally developed to assess experiences across any type of structured activity.

Design/methods

A total of 637 athletes aged 9-19 years completed the YES. A confirmatory factor analysis was conducted to fit the data to the model. The confirmatory factor analysis did not provide strong support for the models tested that resulted in a re-examination of the data using exploratory analyses. This analysis was preceded by a parallel analysis to determine the number of factors to retain.

Results

Results of exploratory analyses created a modified version of the YES that measures 5 dimensions of youth development (personal and social skills, initiative, goal setting, cognitive skills, and negative experiences). The revised version of the scale, which contains 37 items, was renamed the Youth Experience Survey for Sport (YES-S).

Conclusions

The YES-S is proposed as an instrument capable of measuring positive and negative developmental experiences occurring in the youth sport domain.  相似文献   
974.
van Geel, M. & Vedder, P. (2010). The adaptation of non‐western and Muslim immigrant adolescents in the Netherlands: An immigrant paradox? Scandinavian Journal of Psychology, 51, 398–402. This article addresses the possible existence of an immigrant paradox in a sample of immigrant adolescents attending vocational schools in the Netherlands. An immigrant paradox is the finding that first generation immigrants show a more positive pattern of adaptation than nationals despite poorer economic conditions. Second generation immigrants regress to the nationals in terms of adaptation. A sample of 152 first generation immigrant adolescents, 285 second generation immigrant adolescents and 406 national adolescents completed self‐reports about socio‐economic status, psychological problems, behavioral problems and self‐esteem. The results supported the existence of an immigrant paradox in this sample. This indicates that further assimilation among immigrant adolescents does not necessarily lead to increased well being.  相似文献   
975.
Despite the federal mandate to identify and provide appropriate educational and related services to children and youth with serious emotional disturbance (SED), the national profile portrays exceptionally low rates of identification; unacceptably low rates of school completion; high rates of placement in segregated environments; evidence that economic and demographic factors substantially affect identification, placement, and school completion; and a mixed, although mostly discouraging picture of outcomes after leaving the educational system. Recent national leadership, comprised of strategic planning, research, and demonstration initiatives has attained considerable momentum and is intended to improve outcomes for children with SED. Significant changes are anticipated as a result of the upcoming reauthorization of the statute governing special education and related services. These changes reflect a 20 year perspective regarding the benefits and shortcomings of current eligibility criteria and discretionary initiatives for improving outcomes for children with disabilities. The manner in which these changes may affect prospects for better serving children with SED is discussed.  相似文献   
976.
汉字识别的计算机模拟   总被引:4,自引:0,他引:4  
本文总结了作者近年来在连结主义的理论框架下 ,用计算机模拟汉字识别的工作。文章分三部分。第一部分说明了计算机模拟与人工智能的关系。第二部分介绍了作者提出的两个模型 :汉字识别与命名的连结主义模型和基于语义的词汇判断的计算模型。两个模型分别成功地模拟了汉字识别中的频率效应、形声字读音中的规则效应、声旁效应、语义启动效应、语境与频率的交互作用等。第三部分讨论了模拟工作的意义、分布表征、学习算法等问题。研究表明 :认知的计算机模拟能验证人类认知实验的结果 ,对结果提出合理的解释 ,并能指导进一步的实验研究。  相似文献   
977.
The purpose of this study was to teach contextually appropriate affective behavior to 4 youths with autism. Treatment consisted of modeling, prompting, and reinforcement introduced in a multiple baseline design across response categories of affective behavior. During treatment, verbal praise and tokens were delivered contingent on appropriate affective responding during training trials. Modeling and verbal prompting were used as correction procedures. Each youth received treatment in either three or four response categories. Treatment systematically increased responding within the response categories for all 4 participants, with effects being specific to the affective response categories under treatment. Treatment effects occurred across untrained scenarios, therapists, time, and settings, suggesting that generalization had occurred.  相似文献   
978.
中英青少年科学创造力发展的比较   总被引:7,自引:0,他引:7       下载免费PDF全文
将中学生科学创造力测验施测于英国6所中学的1190名青少年及中国2所中学的1087名青少年的研究,得出如下结论:第一,青少年的科学创造力存在显著的年龄差异。随着年龄的增大,青少年的科学创造力呈持续上升趋势,但在14岁时要下降;11-13岁、14-16岁是青少年的科学创造力迅速发展的关键时期;第二,青少年的科学创造力存在性别差异。英国女生的科学创造力比男生强,差异显著;中国男生的科学创造力比女生强,差异不显著;第三,中英青少年的科学创造力存在显著的差异。在创造性的问题解决能力方面,中国青少年明显高于英国青少年,但中国青少年在其它方面的科学创造力及总成绩则明显低于英国青少年;第四,中国青少年的科学创造力存在显著的学校类型差异。重点中学学生的科学创造力显著高于普通中学学生的科学创造力。  相似文献   
979.
中美欧高血压指南之比较   总被引:28,自引:0,他引:28  
通过高血压的定义、分类,危险因素评估,危险分层及治疗,比较了中国、美国、欧洲高血压治疗指南相同和不同,这对于我国高血压的防治有十分重要的意义。  相似文献   
980.
中国传统医学建立在整体论、有机论范式的基础上,难以与近现代科学融为一体,具有封闭性,总体上更接近于经验医学。西方医学是建立在现代科学范式基础上的技术医学,以现代科学成果为依托,并以大众的广泛参与为基础,具有开放性和发展性。  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