全文获取类型
收费全文 | 16573篇 |
免费 | 234篇 |
国内免费 | 27篇 |
专业分类
教育 | 11322篇 |
科学研究 | 1939篇 |
各国文化 | 142篇 |
体育 | 1381篇 |
综合类 | 14篇 |
文化理论 | 138篇 |
信息传播 | 1898篇 |
出版年
2021年 | 160篇 |
2020年 | 229篇 |
2019年 | 321篇 |
2018年 | 472篇 |
2017年 | 498篇 |
2016年 | 482篇 |
2015年 | 317篇 |
2014年 | 416篇 |
2013年 | 2803篇 |
2012年 | 400篇 |
2011年 | 448篇 |
2010年 | 383篇 |
2009年 | 301篇 |
2008年 | 342篇 |
2007年 | 338篇 |
2006年 | 289篇 |
2005年 | 266篇 |
2004年 | 272篇 |
2003年 | 257篇 |
2002年 | 223篇 |
2001年 | 519篇 |
2000年 | 354篇 |
1999年 | 302篇 |
1998年 | 166篇 |
1997年 | 194篇 |
1996年 | 183篇 |
1995年 | 145篇 |
1994年 | 174篇 |
1993年 | 127篇 |
1992年 | 221篇 |
1991年 | 228篇 |
1990年 | 215篇 |
1989年 | 226篇 |
1988年 | 194篇 |
1987年 | 184篇 |
1986年 | 197篇 |
1985年 | 240篇 |
1984年 | 193篇 |
1983年 | 170篇 |
1982年 | 159篇 |
1981年 | 144篇 |
1980年 | 130篇 |
1979年 | 194篇 |
1978年 | 160篇 |
1977年 | 133篇 |
1976年 | 107篇 |
1975年 | 126篇 |
1974年 | 118篇 |
1973年 | 119篇 |
1971年 | 116篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
C.D. Hurt 《Information processing & management》1985,21(3):177-186
This study examines the problem of identification of important authors in science by examining authors in the area of quantum mechanics. An examination was conducted using two methods of identification. The first method was a bibliometric approach and the second a historical approach. A gamma test of association was employed resulting in a finding of significant association between the ranks of authors. The major conclusion was that, when restricted to the same authors, the two methods of identifying important authors produce a statistically significant number of equivalent names. Discussion of the results and areas for further investigation are included. 相似文献
992.
993.
In its search for an objective overall diagnostic evaluation, the University of Illinois Library of the Health Sciences' Program Evaluation Committee selected a book availability measure; it is easy to administer and repeat, results are reproducible, and comparable data exist for other academic and health sciences libraries. The study followed the standard methodology in the literature with minor modifications. Patrons searching for particular books were asked to record item(s) needed and the outcome of the search. Library staff members then determined the reasons for failures in obtaining desired items. The results of the study are five performance scores. The first four represent the percentage probability of a library's operating with ideal effectiveness; the last provides an overall performance score. The scores of the Library of the Health Sciences demonstrated no unusual availability problems. The study was easy to implement and provided meaningful, quantitative, and objective data. 相似文献
994.
995.
996.
Anna C. Baldry 《Pastoral Care in Education》2005,23(2):30-35
This paper reports the Italian data on the bystanders' project. In the last decade, several studies have been conducted on the prevalence and nature of bullying among primary and secondary students as well as on individual and social risk factors, illustrating that bullying in the Italian context is a widespread phenomenon. No research has been conducted, so far, on the 'bystander' behaviours of those students who see other peers being bullied or bullying others in school either physically, verbally or through sexual coercion (i.e. touching girls). The study was conducted with 594 students (51.9% boys and 48.1% girls), aged 12–16 years old, with a mean age of 13.1 (SD=0.87). They were recruited from six different middle schools, two in each of three different sites in Italy: Northern Italy (Vercelli), Central Italy (Rome) and Southern Italy (Catania). Results showed that though the most likely reaction is supporting the victim by trying to discourage the bully, gender differences emerged, with girls more likely than boys to support the victim and boys more likely to encourage the bully or simply ignore. Differences resembling the same pattern emerged also with regard to own involvement as a bully or a victim. Findings are discussed by looking at possible applications for intervention. 相似文献
997.
998.
999.
1000.