全文获取类型
收费全文 | 22919篇 |
免费 | 285篇 |
国内免费 | 138篇 |
专业分类
教育 | 15542篇 |
科学研究 | 2618篇 |
各国文化 | 221篇 |
体育 | 2515篇 |
综合类 | 25篇 |
文化理论 | 170篇 |
信息传播 | 2251篇 |
出版年
2021年 | 203篇 |
2020年 | 337篇 |
2019年 | 460篇 |
2018年 | 644篇 |
2017年 | 622篇 |
2016年 | 606篇 |
2015年 | 414篇 |
2014年 | 529篇 |
2013年 | 3875篇 |
2012年 | 489篇 |
2011年 | 526篇 |
2010年 | 457篇 |
2009年 | 421篇 |
2008年 | 447篇 |
2007年 | 408篇 |
2006年 | 422篇 |
2005年 | 372篇 |
2004年 | 607篇 |
2003年 | 547篇 |
2002年 | 522篇 |
2001年 | 663篇 |
2000年 | 498篇 |
1999年 | 398篇 |
1998年 | 224篇 |
1997年 | 249篇 |
1996年 | 228篇 |
1995年 | 227篇 |
1994年 | 242篇 |
1993年 | 185篇 |
1992年 | 326篇 |
1991年 | 305篇 |
1990年 | 318篇 |
1989年 | 327篇 |
1988年 | 266篇 |
1987年 | 284篇 |
1986年 | 274篇 |
1985年 | 332篇 |
1984年 | 275篇 |
1983年 | 267篇 |
1982年 | 220篇 |
1981年 | 199篇 |
1980年 | 203篇 |
1979年 | 293篇 |
1978年 | 208篇 |
1977年 | 187篇 |
1976年 | 179篇 |
1975年 | 174篇 |
1974年 | 170篇 |
1973年 | 165篇 |
1971年 | 157篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
981.
982.
983.
984.
985.
986.
Dr. Esther C. Garke 《Higher Education in Europe》1980,5(3):37-41
We have received numerous requests to present in “Higher Education in Europe”, in relatively short form, the main features of higher education systems in the different countries of the Unesco European Region.
As partial response to these requests, we present below a survey on the Swiss system of higher education, written for “Higher Education in Europe” by Dr. Esther C. Garke from the Swiss Federal Office for Education and Science, and CEPES Liaison Officer in Switzerland.
We also take this opportunity to invite our readers to provide us with papers or documents for similar presentations. 相似文献
987.
Reading readiness varies as a function of family and environmental variables. This study of 11-year-old children (N = 39) was designed to determine if there was an additional or interactive contribution of brain structure. Evidence is presented that both environmental and biological variables predict phonological development. Temporal lobe (planar) asymmetry, hand preference, family history of reading disability, and SES explained over half of the variance in phonological and verbal performance. The results demonstrate a linear association between cerebral organization and phonological skill within socioeconomic groups. These data provide concrete evidence to support the commonly held assumption that both environmental and biological factors are independent determinants of a child's ability to process linguistic information. 相似文献
988.
Daniel P. Lopresti 《Information Retrieval》2001,4(2):153-173
This paper presents an experimental evaluation of several text-based methods for detecting duplication in scanned document databases using uncorrected OCR output. This task is made challenging both by the wide range of degradations printed documents can suffer, and by conflicting interpretations of what it means to be a duplicate. We report results for four sets of experiments exploring various aspects of the problem space. While the techniques studied are generally robust in the face of most types of OCR errors, there are nonetheless important differences which we identify and discuss in detail. 相似文献
989.
The objectives of this study were to determine nurses' use of electronic databases to inform practice. A questionnaire survey of 114 nurses working on five acute wards in a large inner city teaching hospital investigated their general use of computers and the three databases, CINAHL, MEDLINE and the Cochrane Library. Eighty-two qualified nurses responded (response rate 72%). The results show limited confidence and low frequency in using the databases. Thirty-four per cent expressed low confidence using CINAHL. Twenty-seven per cent used CINAHL on a regular basis. Twenty-two per cent never used it. Eighteen per cent were unaware that it was available locally. Knowledge and use of MEDLINE was even lower with only 18% using it regularly. Knowledge of the Cochrane Library was extremely limited, with 75% unaware of its existence. Use of a home computer and higher education were associated with higher frequency of use of CINAHL and MEDLINE. If nurses are to make use of electronic resources to contribute to evidence-based practice, effort needs to be put into ensuring that already qualified nurses have basic computer skills and specific knowledge of available resources. More emphasis should be placed on 'evidence-based' resources, such as the Cochrane library, as sources of information for practice. 相似文献
990.
Academic medical librarians responsible for monograph acquisition face a challenging task. From the plethora of medical monographs published each year, academic medical librarians must select those most useful to their patrons. Unfortunately, none of the selection tools available to medical librarians are specifically intended to assist academic librarians with medical monograph selection. The few short core collection lists that are available are intended for use in the small hospital or internal medicine department library. As these are the only selection tools available, however, many academic medical librarians spend considerable time reviewing these collection lists and place heavy emphasis on the acquisition of listed books. The study reported here was initiated to determine whether the circulation of listed books in an academic library justified the emphasis placed on the acquisition of these books. Circulation statistics for "listed" and "nonlisted" books in the hematology (WH) section of Indiana University School of Medicine's Ruth Lilly Medical Library were studied. The average circulation figures for listed books were nearly two times as high as the corresponding figures for the WH books in general. These data support the policies of those academic medical libraries that place a high priority on collection of listed books. 相似文献