全文获取类型
收费全文 | 83385篇 |
免费 | 3519篇 |
国内免费 | 41篇 |
出版年
2020年 | 1005篇 |
2019年 | 1223篇 |
2018年 | 1709篇 |
2017年 | 1693篇 |
2016年 | 1819篇 |
2015年 | 1281篇 |
2014年 | 1544篇 |
2013年 | 7171篇 |
2012年 | 2850篇 |
2011年 | 2896篇 |
2010年 | 1729篇 |
2009年 | 1797篇 |
2008年 | 2463篇 |
2007年 | 2430篇 |
2006年 | 2191篇 |
2005年 | 1847篇 |
2004年 | 1879篇 |
2003年 | 1793篇 |
2002年 | 1726篇 |
2001年 | 2665篇 |
2000年 | 2585篇 |
1999年 | 1911篇 |
1998年 | 908篇 |
1997年 | 816篇 |
1996年 | 858篇 |
1995年 | 821篇 |
1994年 | 770篇 |
1993年 | 758篇 |
1992年 | 1590篇 |
1991年 | 1455篇 |
1990年 | 1448篇 |
1989年 | 1372篇 |
1988年 | 1370篇 |
1987年 | 1251篇 |
1986年 | 1242篇 |
1985年 | 1346篇 |
1984年 | 1091篇 |
1983年 | 983篇 |
1982年 | 760篇 |
1979年 | 1133篇 |
1978年 | 838篇 |
1975年 | 905篇 |
1974年 | 1053篇 |
1973年 | 1095篇 |
1972年 | 968篇 |
1971年 | 864篇 |
1969年 | 763篇 |
1968年 | 963篇 |
1967年 | 852篇 |
1966年 | 822篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
972.
973.
The effects of altering light pattern sequences on driver compliance at a busy, urban intersection were explored. The baseline light timing sequences resulted in only 46.8% of drivers stopping at the yellow or red lights. Using an A-B-C design, we altered light pattern sequences that increased the probability of drivers stopping at the signals to 88.8% and 98.8%. These findings indicate that traffic light contingencies have potent effects in influencing driver behaviors at busy intersections. Following completion of the study, the traffic engineer approved the permanence of the light timing pattern that increased traffic rule compliance. Accident data collected before and after the light timing changes indicated a reduction in automobile accidents. 相似文献
974.
975.
976.
L M Ward 《Canadian journal of psychology》1985,39(4):546-563
977.
978.
979.
Joop van der Pligt 《Journal of applied social psychology》1985,15(1):3-15
This study investigated attitude-behavior relationships in the context of energy conservation. Results indicated that general environmental concern is a poor predictor of energy-conservation behaviors. Direct evaluative comparisions of various non-conservationist behaviors with a more conservationist alternative showed a clear relationship with behavioral preference. Non-conservationists, however, evaluated their own behavior only marginally favorably and in some cases clearly unfavorably. This was accompanied by an overestimation of the common occurrence of these behaviors among the general population and by an unwillingness to relate these behaviors to personality characteristics. It is argued that these biases (i.e., considering one's behavior as a habit that is shared by many others) could hinder behavioral change. These findings are discussed in terms of effective public policy on the issue of energy consumption. 相似文献
980.
Gary M. Pace Martin T. Ivancic Glynnis L. Edwards Brian A. Iwata Terry J. Page 《Journal of applied behavior analysis》1985,18(3):249-255
We evaluated a procedure for identifying potential reinforcers with profoundly retarded individuals. In Experiment 1, six persons were repeatedly exposed to 16 stimuli, and approach behaviors to each stimulus were used to identify preferred and nonpreferred stimuli. In Experiment 2, we examined the reinforcing properties of preferred and nonpreferred stimuli by delivering them contingently on the occurrence of arbitrarily selected responses. Results revealed that the preferred stimulus conditions typically produced higher rates of responding than did either the baseline or the nonpreferred stimulus conditions, suggesting that the procedure can be used to assess reinforcer value for individuals with limited behavioral repertoires. 相似文献