全文获取类型
收费全文 | 14674篇 |
免费 | 130篇 |
国内免费 | 25篇 |
专业分类
教育 | 9902篇 |
科学研究 | 2096篇 |
各国文化 | 145篇 |
体育 | 926篇 |
综合类 | 18篇 |
文化理论 | 160篇 |
信息传播 | 1582篇 |
出版年
2021年 | 95篇 |
2020年 | 133篇 |
2019年 | 208篇 |
2018年 | 302篇 |
2017年 | 386篇 |
2016年 | 405篇 |
2015年 | 279篇 |
2014年 | 304篇 |
2013年 | 2359篇 |
2012年 | 369篇 |
2011年 | 381篇 |
2010年 | 266篇 |
2009年 | 228篇 |
2008年 | 305篇 |
2007年 | 278篇 |
2006年 | 249篇 |
2005年 | 850篇 |
2004年 | 669篇 |
2003年 | 463篇 |
2002年 | 276篇 |
2001年 | 218篇 |
2000年 | 203篇 |
1999年 | 181篇 |
1998年 | 95篇 |
1997年 | 94篇 |
1996年 | 113篇 |
1995年 | 97篇 |
1994年 | 111篇 |
1993年 | 119篇 |
1992年 | 161篇 |
1991年 | 166篇 |
1990年 | 158篇 |
1989年 | 162篇 |
1988年 | 131篇 |
1987年 | 156篇 |
1986年 | 158篇 |
1985年 | 178篇 |
1984年 | 168篇 |
1983年 | 166篇 |
1982年 | 129篇 |
1981年 | 136篇 |
1980年 | 115篇 |
1979年 | 154篇 |
1978年 | 161篇 |
1977年 | 114篇 |
1976年 | 113篇 |
1975年 | 109篇 |
1974年 | 90篇 |
1973年 | 107篇 |
1972年 | 90篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
Debasis?GangulyEmail authorView authors OrcID profile Gareth?J.?F.?Jones Aarón?Ramírez-de-la-Cruz Gabriela?Ramírez-de-la-Rosa Esaú?Villatoro-Tello 《Information Retrieval》2018,21(1):1-23
Automatic detection of source code plagiarism is an important research field for both the commercial software industry and within the research community. Existing methods of plagiarism detection primarily involve exhaustive pairwise document comparison, which does not scale well for large software collections. To achieve scalability, we approach the problem from an information retrieval (IR) perspective. We retrieve a ranked list of candidate documents in response to a pseudo-query representation constructed from each source code document in the collection. The challenge in source code document retrieval is that the standard bag-of-words (BoW) representation model for such documents is likely to result in many false positives being retrieved, because of the use of identical programming language specific constructs and keywords. To address this problem, we make use of an abstract syntax tree (AST) representation of the source code documents. While the IR approach is efficient, it is essentially unsupervised in nature. To further improve its effectiveness, we apply a supervised classifier (pre-trained with features extracted from sample plagiarized source code pairs) on the top ranked retrieved documents. We report experiments on the SOCO-2014 dataset comprising 12K Java source files with almost 1M lines of code. Our experiments confirm that the AST based approach produces significantly better retrieval effectiveness than a standard BoW representation, i.e., the AST based approach is able to identify a higher number of plagiarized source code documents at top ranks in response to a query source code document. The supervised classifier, trained on features extracted from sample plagiarized source code pairs, is shown to effectively filter and thus further improve the ranked list of retrieved candidate plagiarized documents. 相似文献
82.
83.
84.
85.
86.
87.
88.
谁改变了我们的常识?——美国教育保守主义运动与教育不平等 总被引:2,自引:0,他引:2
本文考察和分析了美国教育走向保守主义的趋势及其所引发的冲突和斗争。美国教育政策的保守趋势运动是多元的,存在着不同的取向,主要有四种力量构成新自由主义、新保守主义、威权民粹主义和正处在上升阶段的由专业人员和管理人员所构成的新中产阶级。本文侧重探讨了保守主义在改造美国教育的运动中居于领导地位的前两支力量,并认为在教育和社会政策领域,这些力量成功地构建成一个联盟,该联盟成功的重要原因在于对常识的改造,作者将之称为“保守主义的现代化”。 相似文献
89.
Thinking outside of the box: the role of environmental adaptation in the acquisition of skilled and expert performance 总被引:1,自引:1,他引:0
Eccles DW 《Journal of sports sciences》2006,24(10):1103-1114
90.
Myers ND Wolfe EW Maier KS Feltz DL Reckase MD 《Research quarterly for exercise and sport》2006,77(4):451-463
This study extended validity evidence for multidimensional measures of coaching competency derived from the Coaching Competency Scale (CCS; Myers, Feltz, Maier, Wolfe, & Reckase, 2006) by examining use of the original rating scale structure and testing how measures related to satisfaction with the head coach within teams and between teams. Motivation, game strategy, technique, and character building comprised the dimensions of coaching competency. Data were collected from athletes (N = 585) nested within intercollegiate men's (g = 8) and women's (g = 13) soccer and women's ice hockey (g = 11) teams (G = 32). Validity concerns were observed for the original rating scale structure and the predicted positive relationship between motivation competency and satisfaction with the coach between teams. Validity evidence was offered for a condensed post hoc rating scale and the predicted relationship between motivation competency and satisfaction with the coach within teams. 相似文献