全文获取类型
收费全文 | 2220篇 |
免费 | 41篇 |
国内免费 | 1篇 |
专业分类
教育 | 1470篇 |
科学研究 | 275篇 |
各国文化 | 15篇 |
体育 | 187篇 |
综合类 | 8篇 |
文化理论 | 11篇 |
信息传播 | 296篇 |
出版年
2022年 | 21篇 |
2021年 | 20篇 |
2020年 | 27篇 |
2019年 | 45篇 |
2018年 | 49篇 |
2017年 | 79篇 |
2016年 | 69篇 |
2015年 | 60篇 |
2014年 | 67篇 |
2013年 | 394篇 |
2012年 | 58篇 |
2011年 | 64篇 |
2010年 | 52篇 |
2009年 | 37篇 |
2008年 | 47篇 |
2007年 | 47篇 |
2006年 | 37篇 |
2005年 | 29篇 |
2004年 | 40篇 |
2003年 | 32篇 |
2002年 | 28篇 |
2001年 | 25篇 |
2000年 | 42篇 |
1999年 | 52篇 |
1998年 | 21篇 |
1997年 | 14篇 |
1996年 | 19篇 |
1995年 | 16篇 |
1993年 | 14篇 |
1992年 | 21篇 |
1991年 | 33篇 |
1990年 | 45篇 |
1989年 | 34篇 |
1988年 | 30篇 |
1987年 | 21篇 |
1986年 | 32篇 |
1985年 | 39篇 |
1984年 | 34篇 |
1983年 | 28篇 |
1982年 | 26篇 |
1981年 | 22篇 |
1980年 | 18篇 |
1979年 | 27篇 |
1978年 | 29篇 |
1977年 | 20篇 |
1976年 | 17篇 |
1974年 | 17篇 |
1971年 | 17篇 |
1970年 | 14篇 |
1968年 | 19篇 |
排序方式: 共有2262条查询结果,搜索用时 15 毫秒
41.
Rajput ZI Hu SH Arijo AG Habib M Khalid M 《Journal of Zhejiang University. Science. B》2005,6(11):1057-1062
INTRODUCTION The world population of buffaloes(Bubalus bubalis)has been estimated at over172million head,more than97%(167.6million)of which are in Asia and the Pacific region,mainly in India(97.7million)and Pakistan(25.5million)(FAO,2004).About98%of buffaloes in the region are raised by small farmers owning less than two hectares of land and less than five buffaloes(Mudgal,1992).In general,the water buffalo is regarded as more productive,healthier and more useful than the cow,especiall… 相似文献
42.
43.
Meredith A. Park Rogers Dionne I. Cross Melissa Sommerfeld Gresalfi Amy E. Trauth-Nare Gayle A. Buck 《International Journal of Science and Mathematics Education》2011,9(4):893-917
The purpose of this study was to examine the extent to which three teachers’ professional experience and existing orientations
toward teaching and learning mathematics and science influenced their implementation of a project-based curriculum (i.e. project-based
learning (PBL)). Data sources included interviews, videotapes of classroom activity, and a teaching philosophy questionnaire.
Data analysis was conducted using an iterative coding technique. We found coherency between the teachers’ perceived orientations
and their emergent ideas about PBL, their sense of PBL as being compatible with their goals, and the specific challenges with
which they struggled. All the teachers wanted their students to be successful; however, different definitions of success led
to quite different approaches toward teaching, and for the most part, these differences appeared to have occurred because
of existing orientations the teachers held for teaching their discipline. Implications for professional development taking
into account teachers’ orientations and thus their professional experience are discussed, as well as disciplinary challenges
to using PBL. 相似文献
44.
JIŘI LAŽANSKÝ VLADIMÍR MAŘÍK OLGA ŠTĚPÁNKOVÁ 《European Journal of Engineering Education》1992,17(2):143-149
Both the origin and development of artificial intelligence (AI) are connected with the origin and development of computers. Computers play a very important role in engineering education. AI influences such disciplines like CAD, CASE, CAE, and others. The specific experience concerning AI education at a technical university has been gathered in this paper. There is stressed need of good balance between theoretical background and individual training with computers as well as importance of personal experience in solving practical AI. 相似文献
45.
46.
47.
I.V. Ivanova 《Russian Education & Society》2016,58(11):718-731
We define non-formal education as a part of general education, which gives students the required tools for cognition and creativity. It allows them to fully realize their self-potential and to set their own professional and personal goals. In this article, we outline the fundamental differences between general and non-formal education from the point of view of determining opportunities for student self-development. We reveal opportunities where non-formal education can advance personal development within the modern educational paradigm of the Russian Federation. 相似文献
48.
In five conditioned taste aversion experiments with rats, summation, retardation, and preference tests were used to assess the effects of extinguishing a conditioned saccharin aversion for three or nine trials. In Experiment 1, a summation test showed that saccharin aversion extinguished over nine trials reduced the aversion to a merely conditioned flavor (vinegar), whereas three saccharin extinction trials did not subsequently influence the vinegar aversion. Experiment 2 clarified that result, with unpaired controls equated on flavor exposure prior to testing; the results with those controls suggested that the flavor extinguished for nine trials produced generalization decrement during testing. In Experiment 3, the saccharin aversion reconditioned slowly after nine extinction trials, but not after three. Those results suggested the development of latent inhibition after more than three extinction trials. Preference tests comparing saccharin consumption with a concurrently available fluid (water in Experiment 4, saline in Experiment 5) showed that the preference for saccharin was greater after nine extinction trials than after three. However, saccharin preference after nine extinction trials was not greater, as compared with that for either latent inhibition controls (Experiments 4 and 5) or a control given equated exposures to saccharin and trained to drink saline at a high rate prior to testing (Experiment 5). Concerns about whether conditioned inhibition has been demonstrated in any flavor aversion procedure are discussed. Our findings help explain both successes and failures in demonstrating postextinction conditioned response recovery effects reported in the conditioned taste aversion literature, and they can be explained using a memory interference account. 相似文献
49.
The paper discusses the approaches of virtual university strategies and developments in Europe. The discussion is partly based on the work done in the Activity 5 in the EU Thematic Network E4 and partly to the experiences gained through the activities of EUNITE virtual university network of six European universities. Based on our experience we see, that e-learning and virtual university approach can be used for renewal of teaching and learning, both on and off campus. Just three years ago, universities seemed mainly to aim only to develop on campus teaching and learning through ICT. Lately, the use of e-learning as a tool for international cooperation and for virtual mobility (Virtual Erasmus) has started to develop through the activities of the European Union e-learning programmes and through the activities of some European university networks, like EUNITE. To promote virtual universities and e-learning, commitment and actions at all levels from EU to individual institutions are needed. 相似文献
50.
OBJECTIVE: This study compared recidivism rates for alleged maltreatment perpetrators whose initial report was substantiated and those whose initial report was not substantiated, to determine whether they returned to the child welfare system at differing rates. METHOD: Statewide administrative child welfare services data over a period of 4 1/2 years was analyzed. The sample included 31,531 perpetrators of intrafamilial maltreatment. Separate analyses were conducted for each type of maltreatment (sexual abuse, physical abuse, and neglect). RESULTS: Bivariate relationships (substantiation status and recidivism) were analyzed using survival curves, and the study found that recidivism patterns differed by type of maltreatment and by substantiation status at the index event. Multivariate analyses using Cox Proportional Hazards models found that bivariate relationships held true even when controlling for neighborhood mean income, ethnicity, and gender. CONCLUSIONS: The study's finding that perpetrators whose index event was not substantiated return to the child welfare system at a high rate suggests the need to learn how to discriminate those unsubstantiated alleged perpetrators who are most at risk for recidivism. The finding of frequent cross-type recidivism indicates that intervention should focus on common themes across maltreatment types. 相似文献