全文获取类型
收费全文 | 7874篇 |
免费 | 195篇 |
国内免费 | 2篇 |
出版年
2023年 | 43篇 |
2022年 | 38篇 |
2021年 | 70篇 |
2020年 | 86篇 |
2019年 | 136篇 |
2018年 | 264篇 |
2017年 | 249篇 |
2016年 | 327篇 |
2015年 | 210篇 |
2014年 | 147篇 |
2013年 | 471篇 |
2012年 | 469篇 |
2011年 | 472篇 |
2010年 | 149篇 |
2009年 | 119篇 |
2008年 | 190篇 |
2007年 | 182篇 |
2006年 | 145篇 |
2005年 | 1394篇 |
2004年 | 736篇 |
2003年 | 523篇 |
2002年 | 223篇 |
2001年 | 85篇 |
2000年 | 72篇 |
1999年 | 67篇 |
1998年 | 35篇 |
1997年 | 23篇 |
1996年 | 30篇 |
1993年 | 26篇 |
1992年 | 49篇 |
1991年 | 69篇 |
1990年 | 91篇 |
1989年 | 64篇 |
1988年 | 52篇 |
1987年 | 61篇 |
1986年 | 61篇 |
1985年 | 49篇 |
1984年 | 50篇 |
1983年 | 38篇 |
1979年 | 44篇 |
1978年 | 22篇 |
1975年 | 32篇 |
1974年 | 41篇 |
1973年 | 37篇 |
1972年 | 29篇 |
1971年 | 32篇 |
1969年 | 23篇 |
1968年 | 23篇 |
1967年 | 23篇 |
1966年 | 22篇 |
排序方式: 共有8071条查询结果,搜索用时 15 毫秒
81.
82.
83.
84.
85.
Tenacious goal pursuit and flexible goal adjustment: explication and age-related analysis of assimilative and accommodative strategies of coping 总被引:6,自引:0,他引:6
Crises and critical life transitions activate 2 distinct but complementary modes of coping, (a) transforming developmental circumstances in accordance with personal preferences (assimilative tendency) and (b) adjusting personal preferences to situational constraints (accommodative tendency). Assimilative and accommodative tendencies were measured by a questionnaire comprising 2 independent scales (Tenacious Goal Pursuit and Flexible Goal Adjustment). Both scales predict high life satisfaction and low depression and are positively related to generalized internal control beliefs. The scales evinced an opposite relation to age: Cross-sectional analyses on a sample of 890 Ss in the age range from 34 to 63 years revealed a gradual shift from an assimilative to an accommodative mode of coping. Implications for theories of depression and successful aging are discussed. 相似文献
86.
Sjoerd C. de Vries Astrid M. L. Kappers Jan J. Koenderink 《Attention, perception & psychophysics》1993,53(1):71-80
We used quadratic shapes in several psychophysical shape-from-stereo tasks. The shapes were elegantly represented in a 2-D parameter space by the scale-independentshape index and the scale-dependentcurvedness. Using random-dot stereograms to depict the surfaces, we found that the shape of hyperbolic surfaces is slightly more difficult to recognize than the shape of elliptic surfaces. We found that curvedness (and indirectly, scale) has little or no influence on shape recognition. 相似文献
87.
Momentary maximizing in concurrent schedules with a minimum interchangeover interval 总被引:2,自引:2,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)
Eight pigeons were trained on concurrent variable-interval variable-interval schedules with a minimum interchangeover time programmed as a consequence of changeovers. In Experiment 1 the reinforcement schedules remained constant while the minimum interchangeover time varied from 0 to 200 s. Relative response rates and relative time deviated from relative reinforcement rates toward indifference with long minimum interchangeover times. In Experiment 2 different reinforcement ratios were scheduled in successive experimental conditions with the minimum interchangeover time constant at 0, 2, 10, or 120 s. The exponent of the generalized matching equation was close to 1.0 when the minimum interchangeover time was 0 s (the typical procedure for concurrent schedules without a changeover delay) and decreased as that duration was increased. The data support the momentary maximizing theory and contradict molar maximizing theories and the melioration theory. 相似文献
88.
Job Satisfaction Among Ethnic Minorities in The Netherlands 总被引:1,自引:0,他引:1
89.
Escape and avoidance that are disproportional to the danger of the pertinent stimulus are important clinical problems that are often related to inaccurate (catastrophic) expectations. One possible source of such expectations is a prior, underestimated aversive experience. In the present experiment the hypotheses that underestimated pain leads to escape and that it leads to avoidance were tested. In order to control for the effect of the intensity of the pain stimulus, a control group that received 20 pain stimuli of high intensity was formed. Subjects in the experimental condition received 17 pain stimuli of low intensity and 3 of (unexpectedly) high intensity (experimentally induced underprediction). Underprediction of the high intensity stimulus was significantly related to escape, but not to avoidance. The results suggest that the way in which avoidance was operationalized accounts for this. The strong support of the hypothesized relationship between underpredicted pain and escape is an important finding, however. 相似文献
90.
This study was based on data from a longitudinal research program. The cohort consisted of 874 normal children in an entire school grade in a Swedish community. The aim of the study was to investigate the relation between birth weight and behavior at school, for all children and for each sex separately. The results identified specific aspects of behaviour disorder significantly related to low birth weight (LBW) for children at the age of 10 but not at the age of 13. When the sexes were separated, there were no relations between birth weight and deviant behaviour for boys of low birth weight as compared to boys of normal birth weight, while girls of low birth weight showed specific behavioural disorders at age 10 as compared to girls of normal birth weight. For girls reared in families of low parental socioeconomic status, aggressiveness and motor restlessness at age 10 but not at age 13 was also present. Further analyses showed that girls born small-for-gestational age showed lack of school motivation and concentration difficulties both at age 10 and age 13. 相似文献