全文获取类型
收费全文 | 14332篇 |
免费 | 669篇 |
国内免费 | 5篇 |
专业分类
15006篇 |
出版年
2020年 | 183篇 |
2019年 | 217篇 |
2018年 | 351篇 |
2017年 | 313篇 |
2016年 | 328篇 |
2015年 | 243篇 |
2014年 | 290篇 |
2013年 | 1184篇 |
2012年 | 447篇 |
2011年 | 505篇 |
2010年 | 308篇 |
2009年 | 272篇 |
2008年 | 418篇 |
2007年 | 384篇 |
2006年 | 367篇 |
2005年 | 309篇 |
2004年 | 283篇 |
2003年 | 278篇 |
2002年 | 298篇 |
2001年 | 506篇 |
2000年 | 468篇 |
1999年 | 333篇 |
1998年 | 146篇 |
1996年 | 132篇 |
1995年 | 135篇 |
1992年 | 252篇 |
1991年 | 265篇 |
1990年 | 246篇 |
1989年 | 240篇 |
1988年 | 239篇 |
1987年 | 216篇 |
1986年 | 214篇 |
1985年 | 215篇 |
1984年 | 197篇 |
1983年 | 147篇 |
1982年 | 154篇 |
1981年 | 121篇 |
1979年 | 188篇 |
1978年 | 124篇 |
1977年 | 121篇 |
1975年 | 169篇 |
1974年 | 190篇 |
1973年 | 208篇 |
1972年 | 184篇 |
1971年 | 165篇 |
1970年 | 163篇 |
1969年 | 156篇 |
1968年 | 208篇 |
1967年 | 173篇 |
1966年 | 170篇 |
排序方式: 共有10000条查询结果,搜索用时 10 毫秒
171.
Full-time employed (N = 255), partly employed (N = 48), and unemployed (N = 43) male and female university graduates completed a questionnaire that included measures designed to assess expected job levels and current job levels and two measures of potential social action (willingness to volunteer actions and hours to a fictional Campaign to Assist Unemployed Youth). Comparisons between groups and the results of multiple regression analyses provided mixed support for the prediction that larger negative gaps between expected and current employment status would be associated with a greater willingness to assist the Campaign. The unemployed respondents tended to volunteer more actions and more hours to the Campaign than did the other two groups. A multiple regression analysis showed that the current level by expected level interaction term was statistically significant as predicted, but only for the fully employed graduates. Within the full-time employed group, female graduates and those from the humanities/social sciences/education schools expressed more willingness to assist the Campaign than did male graduates and those from the sciences/medicine schools of the university. Results were discussed in relation to current research on relative deprivation and reported affect and to recent studies of job satisfaction. 相似文献
172.
173.
A behavioural programme to treat psychological distress following mastectomy for breast cancer is described. The first 10 patients to be treated were randomly allocated to two treatment groups: Behavioural Programme Only or Behavioural Programme + Drugs (antidepressant medication). Both groups showed improvement over treatment, but the Behavioural Programme + Drugs group appeared to maintain their improvement better. 相似文献
174.
These experiments investigate whether or not differences in the way that retarded and nonretarded individuals monitor and regulate speed and accuracy of responding contribute to the slower and more variable performance of retarded subjects on choice reaction time (RT) tasks. Rabbitt (1979, 1981) suggested that efficient choice RT performance is mediated by subjects tracking increasingly faster RT bands on successive trials until, by making and recognizing errors, they discover those very fast RT levels that should be avoided and those safe bands, just above typical error levels, that should be tracked. Experiments 1A and 1B established that most retarded subjects detect their errors as efficiently as nonretarded controls, a finding that excludes the possibility that retarded subjects do not monitor accuracy efficiently but achieve comparable levels of accuracy by consistently responding within very slow RT bands that minimize likelihood of errors. Experiment 2 showed that while a qualitatively similar trial-by-trial tracking mechanism mediates the performance of both groups, retarded subjects are less efficient at constraining RTs within very fast, but safe, bands. Increasing error probabilities at longer RTs suggest that momentary fluctuations in stimulus discriminability and/or attention are factors affecting RT variability in retarded subjects. The RT patterns for various sequences of correct responses initiated and terminated by errors suggest that the effective past experience (EPEX) guiding trial-by-trial RT adjustments of retarded subjects is short and inadequate, and it was argued that this can account for much of the remaining RT variability contributing to retarded-nonretarded differences. Not only does a short EPEX increase variability by giving rise to long error-free sequences of slower than average RT but also, when combined with occasional specified random fluctuations, it suggests why retarded subjects can achieve, but not sustain, RT levels maintained by nonretarded subjects. 相似文献
175.
176.
Stimulus selection in passive avoidance learning and retention: weanling, periadolescent, and young adult rats 总被引:1,自引:0,他引:1
Periadolescent rats exhibit a number of behavioral differences in comparison with younger or older animals. For instance, periadolescents tend to show enhanced acquisition of simple active avoidance tasks, but impaired acquisition of more complex appetitive and aversive discriminations. In this experiment, rats were trained on a simple passive avoidance task at one of three ages, as weanlings (25 days), periadolescents (35 days), or young adults (45 days). Training occurred in the presence of both a redundant discriminative stimulus and a specified, redundant contextual stimulus. The periadolescents did not differ from either younger or older rats in rate of learning the passive avoidance task. The retention performance of these animals was then tested following a change in either, neither, or both of the redundant cues. When a measure of performance that controls for baseline activity was used, it was observed that periadolescents were not disrupted by a change in the redundant discriminative stimulus, a cue change that clearly disrupted performance in 25- and 45-day-old animals, and tended to be more disrupted by the contextual change than younger or older rats. It is hypothesized that the alterations in performance exhibited by periadolescents may be related to an ontogenetic alteration in stimulus selection modulated by the catecholaminergic systems. 相似文献
177.
178.
P Hull Smith 《Journal of experimental child psychology》1984,38(3):400-414
The ability of 5-month-old infants to recall temporal information and utilize temporal organization was investigated in two experiments. Infants were trained to fixate a hierarchically structured or an unstructured sequence of stimuli which appeared in four spatial positions. In the first study, the number of infants who demonstrated correct recall through the third serial position of a sequence was significantly better then would occur by chance. In the second study, infants given structured sequences showed a significant increase in the number of correct fixations across trials, and they recalled across serial positions better in structured sequences. Also, accuracy of recall in both studies for the middle serial positions was related to hierarchical organization following 8-unit structured sequence training but was at chance level following unstructured sequence training. Results of both studies were interpreted within a temporal organizational framework: Infants appear to utilize organization within sequences of information. 相似文献
179.
Jane E. Smith 《Behaviour research and therapy》1984,22(4):331-347
The history of the growth of interest in child abuse in the Western World over the last two decades is described chronologically. Problems of definition of a phenomenon which is a deviation from social norms are discussed, including the problem of distinguishing acceptable discipline from abuse. The literature on parent-training approaches to the treatment of abusive parents is reviewed. It is argued that researchers in the U.S.A. and the U.K. are working within different statutory frameworks, from different definitional criteria and with different conceptualizations of successful outcome. The need for multiple outcome measures, in terms of quality of life for the abused child, and for long-term follow-up is stressed, together with the importance of clinical experience in the planning and execution of evaluative treatment research. 相似文献
180.
A consecutive series of 30 school refusers received behavioural treatment (BTA). Their outcome is compared with that of 16 school refusers who were hospitalized and 20 who received psychotherapy and home tuition. The BTA group showed superior outcome compared to the other two groups. The Home-tuition group did very badly. There was no evidence of symptom substitution in the 28 cases treated successfully by behaviour therapy. 相似文献