全文获取类型
| 收费全文 | 9373篇 |
| 免费 | 117篇 |
| 国内免费 | 21篇 |
专业分类
| 教育 | 6905篇 |
| 科学研究 | 642篇 |
| 各国文化 | 143篇 |
| 体育 | 796篇 |
| 综合类 | 4篇 |
| 文化理论 | 111篇 |
| 信息传播 | 910篇 |
出版年
| 2022年 | 39篇 |
| 2021年 | 84篇 |
| 2020年 | 119篇 |
| 2019年 | 219篇 |
| 2018年 | 264篇 |
| 2017年 | 293篇 |
| 2016年 | 308篇 |
| 2015年 | 194篇 |
| 2014年 | 232篇 |
| 2013年 | 2182篇 |
| 2012年 | 224篇 |
| 2011年 | 236篇 |
| 2010年 | 252篇 |
| 2009年 | 243篇 |
| 2008年 | 267篇 |
| 2007年 | 242篇 |
| 2006年 | 194篇 |
| 2005年 | 198篇 |
| 2004年 | 197篇 |
| 2003年 | 164篇 |
| 2002年 | 195篇 |
| 2001年 | 140篇 |
| 2000年 | 180篇 |
| 1999年 | 150篇 |
| 1998年 | 120篇 |
| 1997年 | 121篇 |
| 1996年 | 124篇 |
| 1995年 | 112篇 |
| 1994年 | 121篇 |
| 1993年 | 111篇 |
| 1992年 | 106篇 |
| 1991年 | 136篇 |
| 1990年 | 110篇 |
| 1989年 | 93篇 |
| 1988年 | 70篇 |
| 1987年 | 97篇 |
| 1986年 | 80篇 |
| 1985年 | 95篇 |
| 1984年 | 96篇 |
| 1983年 | 83篇 |
| 1982年 | 69篇 |
| 1981年 | 68篇 |
| 1980年 | 55篇 |
| 1979年 | 61篇 |
| 1978年 | 74篇 |
| 1977年 | 74篇 |
| 1976年 | 56篇 |
| 1975年 | 52篇 |
| 1974年 | 44篇 |
| 1971年 | 37篇 |
排序方式： 共有9511条查询结果，搜索用时 765 毫秒
1.
2.
3.
James D. T. Tannock 《Higher Education Quarterly》1992,46(1):108-123
This article describes the Engineering Professors' Conference (EPC) approach to quality assurance for Higher Education Institutions, which is currently the only formalized alternative to British Standard 5750 'Quality Systems'. The EPC approach is based on principles of quality assurance and Total Quality Management which have been developed in industry. These ideas are briefly outlined, and an opinion expressed on the interpretation and application of BSS7S0 for HE. The EPC model is explained, illustrated with example elements taken from the EPC Specification and Guidelines for Quality Assurance in Higher Education. A top-down approach to the development of an institutional quality system is described, based on a quality policy statement. Areas of activity which have an important impact on the quality of education are identified, emphasising the quality assurance requirements of academic departments. Supporting and administrative quality system requirements are also described, as these also play an important role in the quality of education. Formal quality procedures and documentation in key areas are proposed. 相似文献
4.
As a group, students with learning disabilities (LD) have social difficulties. One possible explanation for these difficulties is the unique way they process social information. Although students with LD may differ from their nondisabled peers in their social cognition, investigators have suggested the presence of subgroups within the population of students with LD who may differ in their social competence and, thereby, shed light on the source of the difficulties. The present exploratory study examined how two subgroups of students with LD in inclusive settings, students with high and low social status, perceive social situations. Using a sociometric technique, three students with LD receiving high social‐status ratings and three students with LD receiving low social‐status ratings were identified. A qualitative approach was used to gather and evaluate data from the participants and their teachers. Results suggested differences between the two subgroups in their (1) sensitivity to cues in the environment, (2) interpretation of social situations in relation to their own experiences, and (3) levels of self‐control. Implications of these findings for practice and future research are discussed. 相似文献
5.
6.
Measuring Search Engine Quality 总被引：12，自引：3，他引：9
The effectiveness of twenty public search engines is evaluated using TREC-inspired methods and a set of 54 queries taken from real Web search logs. The World Wide Web is taken as the test collection and a combination of crawler and text retrieval system is evaluated. The engines are compared on a range of measures derivable from binary relevance judgments of the first seven live results returned. Statistical testing reveals a significant difference between engines and high intercorrelations between measures. Surprisingly, given the dynamic nature of the Web and the time elapsed, there is also a high correlation between results of this study and a previous study by Gordon and Pathak. For nearly all engines, there is a gradual decline in precision at increasing cutoff after some initial fluctuation. Performance of the engines as a group is found to be inferior to the group of participants in the TREC-8 Large Web task, although the best engines approach the median of those systems. Shortcomings of current Web search evaluation methodology are identified and recommendations are made for future improvements. In particular, the present study and its predecessors deal with queries which are assumed to derive from a need to find a selection of documents relevant to a topic. By contrast, real Web search reflects a range of other information need types which require different judging and different measures. 相似文献
7.
8.
9.
10.
本文要点: ◆遗传型是机体全部遗传基因的总和,代表了个体的遗传潜力.在决定个体的解剖、生化、生理、行为等特性或遗传表型(如褐色的眼睛、75kg的体重、50 ml/kg/min的最大摄氧量等)上起主导作用. 相似文献