全文获取类型
收费全文 | 1520篇 |
免费 | 93篇 |
出版年
2023年 | 11篇 |
2022年 | 23篇 |
2021年 | 19篇 |
2020年 | 34篇 |
2019年 | 48篇 |
2018年 | 66篇 |
2017年 | 82篇 |
2016年 | 52篇 |
2015年 | 38篇 |
2014年 | 54篇 |
2013年 | 175篇 |
2012年 | 80篇 |
2011年 | 90篇 |
2010年 | 41篇 |
2009年 | 56篇 |
2008年 | 67篇 |
2007年 | 58篇 |
2006年 | 53篇 |
2005年 | 74篇 |
2004年 | 53篇 |
2003年 | 49篇 |
2002年 | 41篇 |
2001年 | 14篇 |
2000年 | 16篇 |
1999年 | 24篇 |
1998年 | 19篇 |
1997年 | 12篇 |
1996年 | 16篇 |
1995年 | 14篇 |
1994年 | 12篇 |
1993年 | 13篇 |
1992年 | 13篇 |
1991年 | 10篇 |
1990年 | 11篇 |
1989年 | 10篇 |
1988年 | 9篇 |
1987年 | 14篇 |
1986年 | 9篇 |
1985年 | 13篇 |
1984年 | 12篇 |
1983年 | 11篇 |
1982年 | 8篇 |
1981年 | 8篇 |
1980年 | 7篇 |
1979年 | 9篇 |
1977年 | 6篇 |
1976年 | 7篇 |
1975年 | 5篇 |
1973年 | 6篇 |
1972年 | 6篇 |
排序方式: 共有1613条查询结果,搜索用时 15 毫秒
121.
122.
123.
124.
125.
126.
Nicholas?G.?EvansEmail author Michael?J.?Selgelid 《Science and engineering ethics》2015,21(4):1065-1083
In this article, we raise ethical concerns about the potential misuse of open-source biology (OSB): biological research and development that progresses through an organisational model of radical openness, deskilling, and innovation. We compare this organisational structure to that of the open-source software model, and detail salient ethical implications of this model. We demonstrate that OSB, in virtue of its commitment to openness, may be resistant to governance attempts. 相似文献
127.
128.
129.
Test anxiety (TA) is a prevalent issue among students that can result in deleterious consequences, such as underachievement. However, a contemporary measure that has been validated for use with Australian students seems to be lacking. This study, therefore, investigated the suitability of the German Test Anxiety Inventory (TAI‐G) for use with Australian university students. While the original TAI‐G contains 30 items and was designed to measure four factors (worry, emotionality, interference, and lack of confidence), differing factorial models have been supported in the literature using either the original or a shortened 17‐item version of the measure. These differing TAI‐G models were tested and compared in the current study via confirmatory factor analysis using 224 Australian university students. As expected, results supported the superior fit of the 17‐item four‐factor model. Additionally, the convergent validity of the measure was supported since measures of self‐esteem, self‐efficacy, and general anxiety were all found to correlate significantly with the TAI‐G in the hypothesised directions. Finally, the finding that all of the TAI‐G subscales had acceptably high reliabilities led to the conclusion that the 17‐item TAI‐G is a valid and reliable measure of TA in an Australian university population. 相似文献
130.