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   1211篇
  免费   173篇
  国内免费   1篇
教育   353篇
科学研究   51篇
各国文化   5篇
体育   26篇
综合类   3篇
文化理论   7篇
信息传播   940篇
  2023年   7篇
  2022年   10篇
  2021年   10篇
  2020年   24篇
  2019年   21篇
  2018年   45篇
  2017年   32篇
  2016年   85篇
  2015年   79篇
  2014年   28篇
  2013年   83篇
  2012年   21篇
  2011年   26篇
  2010年   8篇
  2009年   7篇
  2008年   13篇
  2007年   80篇
  2006年   39篇
  2005年   10篇
  2004年   60篇
  2003年   4篇
  2002年   6篇
  2001年   72篇
  1999年   43篇
  1998年   85篇
  1997年   65篇
  1996年   72篇
  1995年   52篇
  1994年   81篇
  1993年   86篇
  1992年   46篇
  1991年   5篇
  1990年   32篇
  1988年   4篇
  1987年   4篇
  1986年   4篇
  1985年   2篇
  1984年   2篇
  1981年   2篇
  1979年   2篇
  1978年   3篇
  1977年   2篇
  1976年   2篇
  1974年   2篇
  1971年   2篇
  1970年   7篇
  1965年   1篇
  1963年   2篇
  1961年   2篇
  1959年   1篇
排序方式: 共有1385条查询结果,搜索用时 31 毫秒
21.
22.
23.
The initial time difference practical stability in terms of two measures has been investigated for nonlinear fractional differential equations in Caputo's sense and these properties have been unified with Lyapunov-like functions to establish a comparison result.  相似文献   
24.
Following a tour d'horizon of the development of science and science policy in former Yugoslavia, the author focuses on the application of science to development in this country after the Second World War. In particular, she examines the role of computer science in which Yugoslav scientists developed much endogenous capacity. The events following the break-up of Yugoslavia led to the isolation and the emigration of scientists, academics, and graduate students, particularly from Serbia, in the reduced Yugoslavia that remained after the break-up. During the period of sanctions, Yugoslavia was denied even the right to participate in TEMPUS projects that were underway. The TEMPUS III projects in which Yugoslavia can participate are not very helpful in rebuilding the scientific capacity of the country. The country needs assistance, possibly best given through twinning arrangements with universities in other countries, to rebuild its scientific capacity. Economic aid to rebuild infrastructures is also needed. Only when talented young scientists can look forward to a future at home will they no longer seek to emigrate.  相似文献   
25.
简述陆地卫星多光谱扫描(MSS)影象的特点,着重介绍陆地卫星多光谱扫描影象适用于中、小比例尺的土地资源凋查  相似文献   
26.
Increasingly, children who start school have already acquired basic reading and writing skills provided by their parents or preschool teachers. However, even if we choose to accept the fact that by teaching preschool children how to read and write parents wish to help them integrate successfully into the school environment and methods of work, we still need to emphasize that certain activities are not in balance with the needs, abilities, and potentials of a preschool child. At the same time some other possibilities are not being used enough (e.g., visual art). The present research introduces this aspect and presents training prewriting skills based on visual art activities given that visual art represents one of the primary media that every child spontaneously uses in his or her preschool years.  相似文献   
27.
The study examined the predictive value of adolescents’ personality trait ratings by different groups of informants in explaining academic achievement [grade point average (GPA)] while controlling for students’ sex and their mothers’ education. The Inventory of Child/Adolescent Individual Differences was employed as a measure of students’ personality traits at the end of elementary schooling (mean age = 14.7 years) and two years later when the participants attended secondary schools. The trait ratings were obtained through self‐, maternal and peer reports at both measurement occasions. They explained substantial portions of unique variance in the students’ GPA concurrently, and over time. Ratings by each of the three groups of informants had an incremental validity over one another in predicting school grades. Among personality variables, conscientiousness and low extraversion were consistently predictive of GPA.  相似文献   
28.
The aim of the present study was to conduct an analysis of TIMSS (Trends in International Mathematics and Science Study) 2003 database and to determine how negative school factors, such as aggression, are associated to the mathematical and science achievement of students. The analyses were conducted separately for national and international data. National analyses for Slovenia show significant associations between math and science achievement and the experience of aggressive behaviour. Students who experienced aggressive behaviour scored lower in math and science, both in the fourth and in the eighth grade. The results of the regression analysis show that negative factors, such as aggressive behaviour, are good predictors of educational achievement in Slovenia. International analyses for the selected countries (high‐ and low‐achieving countries from the whole TIMSS population) confirm that this type of finding is culturally impartial as well as valid for the level of achievement both in math and in science.  相似文献   
29.
基于互联网社区的消费者需求信息采集策略   总被引:1,自引:0,他引:1  
徐颖  李倩 《图书情报工作》2011,55(24):121-125
从互联网社区参与者角色--社区建设者、主题发布者、话题讨论者出发,提出企业在互联网社区上采集消费者需求信息的基本方针,分析在互联网社区上消费者需求信息表现形式的转化过程,构建在互联网社区上采集消费者需求信息的具体路线,以此为企业制定在互联网社区上采集消费者需求信息策略提供借鉴。  相似文献   
30.
本文在选取我国图书馆学情报学领域24种典型期刊的基础上,利用期刊同被引分析方法对从CNKI中检索出的1999—2009年的期刊同被引数据进行了分析,包括聚类分析、多维尺度分析和因子分析,得出了期刊的关系与结构及其在图书馆学情报学领域中的地位。  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