全文获取类型
收费全文 | 63336篇 |
免费 | 2382篇 |
国内免费 | 29篇 |
出版年
2019年 | 741篇 |
2018年 | 1053篇 |
2017年 | 1054篇 |
2016年 | 1099篇 |
2015年 | 787篇 |
2014年 | 946篇 |
2013年 | 5558篇 |
2012年 | 1639篇 |
2011年 | 1760篇 |
2010年 | 1153篇 |
2009年 | 1121篇 |
2008年 | 1644篇 |
2007年 | 1500篇 |
2006年 | 1400篇 |
2005年 | 1188篇 |
2004年 | 1107篇 |
2003年 | 1200篇 |
2002年 | 1103篇 |
2001年 | 2120篇 |
2000年 | 2072篇 |
1999年 | 1541篇 |
1998年 | 701篇 |
1996年 | 712篇 |
1995年 | 688篇 |
1994年 | 697篇 |
1993年 | 655篇 |
1992年 | 1437篇 |
1991年 | 1340篇 |
1990年 | 1330篇 |
1989年 | 1195篇 |
1988年 | 1161篇 |
1987年 | 1165篇 |
1986年 | 1126篇 |
1985年 | 1188篇 |
1984年 | 997篇 |
1983年 | 806篇 |
1981年 | 658篇 |
1979年 | 958篇 |
1978年 | 719篇 |
1976年 | 648篇 |
1975年 | 886篇 |
1974年 | 876篇 |
1973年 | 1001篇 |
1972年 | 868篇 |
1971年 | 760篇 |
1970年 | 703篇 |
1969年 | 689篇 |
1968年 | 854篇 |
1967年 | 741篇 |
1966年 | 775篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
911.
912.
913.
Fear of death and the concept of extended self 总被引:1,自引:0,他引:1
914.
915.
Symmetry and transitivity of conditional relations in monkeys (Cebus apella) and pigeons (Columba livia) 总被引:10,自引:10,他引:0
下载免费PDF全文
![点击此处可从《Journal of the experimental analysis of behavior》网站下载免费的PDF全文](/ch/ext_images/free.gif)
D'Amato MR Salmon DP Loukas E Tomie A 《Journal of the experimental analysis of behavior》1985,44(1):35-47
In Experiment 1 six monkeys were tested with discriminative relations that were backward relative to their training in a 0-second conditional (“symbolic”) matching procedure. Although there was some indication of backward associations, the evidence was generally weak, and statistical evaluations did not reach conventional significance levels. Unlike children, who show backward associations to the point of symmetry, monkeys and pigeons display at best only weak and transient backward associations. In Experiment 2 associative transitivity was assessed across two sets of conditional matching tasks. All four monkeys tested demonstrated strong transitivity. In contrast, in Experiment 3 there was no evidence of transitivity in three pigeons tested under conditions closely comparable to those of Experiment 2. These results may identify some key features of interspecies differences and contribute to analyses of serial learning in animals. 相似文献
916.
24 women over 60 yr. and 24 younger women rated the severity of life stress events drawn from a pool of events occurring to elderly people. There were no over-all age differences, but rather strong agreement on which events were most threatening. There was some evidence, however, that the old rated 'severe' death events as less threatening than younger women. 相似文献
917.
D Siegel 《Perceptual and motor skills》1985,60(2):459-466
The purpose of this study was to investigate whether the hypothesized information-processing mechanisms, thought to be reflected by the slope and intercept of the regression of choice reaction time on stimulus information or information transmitted could account for performance on two novel laboratory tasks. In addition, analyses were performed to determine whether these theorized mechanisms represent stable within individual abilities or task specific capabilities. Analysis indicated that the slopes obtained from two different choice reaction time paradigms were unrelated while intercepts were moderately correlated. Examination of the pattern of zero-order correlations further showed that regression components were not meaningfully related to performance on either novel task, suggesting that knowledge of information-processing mechanisms, as assessed in choice RT paradigms, did not enhance the understanding of performance in more complex tasks. 相似文献
918.
On the basis of surveys completed by 105 male participants in a popular marathon, a multiple regression analysis was conducted to identify the variables contributing significantly to the prediction of final time. Overall prediction was successful, with R = .896, and training pace was the most important factor in the equation, speedier workouts being associated with faster marathon times. Final time was also related positively to best 10-km race time in the previous 12 mo. and repression-sensitization (faster runners being more sensitized), and negatively to maximum number of training miles in a single week, number of previous marathons completed, and number of days of training lost through illness or injury. Contrary to expectations, locus of control was not related to final time. Only 27% of the runners had lost training time through injury, but a discriminant analysis showed that, compared to those who had avoided this problem, the injured were younger, rested less, ran less in the week prior to the marathon, ran a slightly longer long run but ran it earlier before the race, and ran fewer runs of 20 miles or more. It is suggested that researchers should study the repression-sensitization variable and investigate injury in runners preparing for a marathon. 相似文献
919.
Correlations were calculated between the Token Test of Language Development (Token) and scores of the Wechsler Intelligence Scale for Children--Revised (WISC-R) based on responses from 38 Caucasian children (23 boys and 15 girls) of a semi-rural Northeastern Ohio school district. The relatively low Pearson correlations (.25 to .47) between the standard scores in the Token test and WISC-R IQs are discussed in relation to ability and achievement. 相似文献
920.
R M Olig R D Staton W W Beatty H Wilson R I Biberdorf S G Hoag R A Brumback 《Perceptual and motor skills》1985,60(3):879-889
Plasma concentrations of imipramine and amitriptyline and their desmethylated metabolites were measured in 20 children being treated for major depressive illness 2 wk. and 5 to 10 wk. after achieving drug dosages of 2.25 mg/kg body weight. At 2 wk. all children had exhibited clinical improvement, but by 10 wk. 4 of the 10 children treated with imipramine and 5 of the 10 children treated with amitriptyline had experienced clinical relapse of depressive symptoms. Tricyclic antidepressant plasma concentrations and ratios were comparable in the subgroups of children who maintained their clinical improvement and those who relapsed. There was no evidence of a systematic decline in plasma tricyclic antidepressant concentrations in those children who relapsed. 相似文献