全文获取类型
收费全文 | 39391篇 |
免费 | 1720篇 |
国内免费 | 10篇 |
专业分类
41121篇 |
出版年
2020年 | 422篇 |
2019年 | 564篇 |
2018年 | 747篇 |
2017年 | 813篇 |
2016年 | 810篇 |
2015年 | 582篇 |
2014年 | 720篇 |
2013年 | 3176篇 |
2012年 | 1269篇 |
2011年 | 1364篇 |
2010年 | 810篇 |
2009年 | 824篇 |
2008年 | 1174篇 |
2007年 | 1162篇 |
2006年 | 1071篇 |
2005年 | 983篇 |
2004年 | 950篇 |
2003年 | 862篇 |
2002年 | 902篇 |
2001年 | 1127篇 |
2000年 | 1056篇 |
1999年 | 821篇 |
1998年 | 481篇 |
1997年 | 396篇 |
1996年 | 396篇 |
1992年 | 639篇 |
1991年 | 603篇 |
1990年 | 585篇 |
1989年 | 590篇 |
1988年 | 587篇 |
1987年 | 544篇 |
1986年 | 577篇 |
1985年 | 630篇 |
1984年 | 512篇 |
1983年 | 483篇 |
1982年 | 424篇 |
1981年 | 411篇 |
1979年 | 576篇 |
1978年 | 429篇 |
1976年 | 402篇 |
1975年 | 481篇 |
1974年 | 525篇 |
1973年 | 555篇 |
1972年 | 446篇 |
1971年 | 406篇 |
1970年 | 397篇 |
1969年 | 426篇 |
1968年 | 513篇 |
1967年 | 431篇 |
1966年 | 436篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
931.
TEMPORAL CONTROL ON INTERVAL SCHEDULES: WHAT DETERMINES THE POSTREINFORCEMENT PAUSE? 总被引:1,自引:1,他引:0 下载免费PDF全文
N K Innis S K Mitchell J E Staddon 《Journal of the experimental analysis of behavior》1993,60(2):293-311
On fixed-interval or response-initiated delay schedules of reinforcement, the average pause following food presentation is proportional to the interfood interval. Moreover, when a number of intervals of different durations occur in a programmed cyclic series, postreinforcement pauses track the changes in interval value. What controls the duration of postreinforcement pauses under these conditions? Staddon, Wynne, and Higa (1991), in their linear waiting model, propose control by the preceding interfood interval. Another possibility is that delay to reinforcement, signaled by a key peck and/or stimulus change, determines the subsequent pause. The experiments reported here examined the role of these two possible time markers by studying the performance of pigeons under a chained cyclic fixed-interval procedure. The data support the linear waiting model, but suggest that more than the immediately preceding interfood interval plays a role in temporal control. 相似文献
932.
Michael E. Cavanagh Ph.D. 《Pastoral Psychology》1993,41(4):207-215
The basic purpose of pastoral counseling, and counseling in general, is to help people change. Therefore, it's critically important to understand the nature of change and to have realistic expectations with respect to how much people can change. To expect too little change can lead to underachievement and despair, whereas to expect too much change can cause needless frustration and an abiding sense of failure. This article discusses behavioral change, its potential and its limits, from the point of view of genetic potential and offers some specific pastoral implications. 相似文献
933.
Daniel S. Shaw Ph.D. Robert E. Emery Michele D. Tuer 《Journal of abnormal child psychology》1993,21(1):119-134
This paper prospectively examined relations between marital status, predivorce parenting practices, and children's adjustment, using data from the New York Longitudinal Study (NYLS). Prospective analyses of children's predivorce adjustment indicated that neither boys nor girls showed more problematic behavior prior to parental separation, and only boys had more difficulties after divorce. However, parents of to-be-divorced families reported more difficulties in childcare practices before divorce than did parents of always-married families. Parenting difficulties in to-be-divorced families were found consistently for boys but not for girls. Results suggest that the difficulties found among boys after divorce may be linked with parenting problems that begin before divorce.The authors are indebted to Alexander Thomas and Stella Chess, the original investigators of the project. We also would like to thank Jacqueline and Richard Lerner, and the John D. and Catherine MacArthur Foundation for their efforts in preserving this data base. 相似文献
934.
Virginia E. Fee Johnny L. Matson Ph.D. Lisa A. Moore Debra A. Benavidez 《Journal of abnormal child psychology》1993,21(1):1-11
The independence of hyperactivity, attention deficits, and conduct problems among mentally retarded children was addressed using factors of the Conners' Teacher Rating Scale-39 (CTRS-39) and the more recently developed IOWA Conners' inattention/overactivity (IO) and aggression (A) subscales. CTRS-39 ratings were obtained for children of normal intelligence and for mentally retarded children. Differences between the groups were examined as were intercorrelations of the Conners' factors and IOWA subscales. Conduct problems proved to be less strongly associated with hyperactivity and attention deficits among mentally retarded children compared to children of normal intelligence. However, attention problems and conduct problems may be associated with mental retardation in general. Implications of these data and CTRS scoring system recommendations for mentally retarded children are discussed. 相似文献
935.
The purpose of this research was to determine the role of syllabic stress in language processing during the early on-line processing of speech and later in the representation of a sentence in memory. Experiment 1 used a syllable monitoring task while Experiment 3 used a probe task in which subjects heard a sentence and then were asked to determine whether a probe syllable had occurred in the sentence. In the monitoring task, stressed syllables were detected more rapidly in word-initial position, but unstressed syllables were detected more rapidly in word-final position. Stress facilitation in initial syllables was strongly related to high relative F0, but not to changes in perceived vowel quality as assessed in Experiment 2. This pattern is interpreted as evidence that lexical stress is used on-line to guide lexical access and/or lexical segmentation. The probe task of Experiment 3 showed stress facilitation in both positions, indicating that stress is independently retained in the postperceptual representation of a sentence.The research reported in this paper was supported by grant 80-0416 to Harvard University (Peter C. Gordon, Principal Investigator) from the Air Force Office of Scientific Research Life Sciences Directorate. We thank Chris Thurber for his extensive and competent assistance in testing subjects and making acoustic measurements, and Jay Rueckl for comments on an earlier version of this paper 相似文献
936.
Peter S. Jensen Doreen Koretz Ben Z. Locke Stanley Schneider Marian Radke-Yarrow John E. Richters Judith M. Rumsey 《Journal of abnormal child psychology》1993,21(5):551-580
In November 1990 the National Institute of Mental Health (NIMH) convened a special conference of over 100 scientists and leaders to outline specific strategies and research initiatives that should be developed to implement the recently released National Plan for Research on Child and Adolescent Mental Disorders.Participants included journal editors, educators from psychology and psychiatry, representatives from private foundations, and leaders of research program areas in public funding agencies. Critical knowledge gaps were identified in five areas of child and adolescent psychopathology, including depression, attention deficit hyperactivity disorder, conduct disorder, the anxiety disorders, and the developmental disorders. For each of these areas, special emphasis was placed on developing new ideas and obtaining critical input from other areas of investigation. This report summarizes the identified research gaps and recommends research initiatives to implement the National Plan, as outlined by the conference participants. 相似文献
937.
Janice E. Murray Pierre Jolicoeur Patricia A. McMullen Margaret Ingleton 《Memory & cognition》1993,21(5):604-610
The effects of stimulus orientation on naming were examined in two experiments in which subjects identified line drawings of natural objects following practice with the objects at the same or different orientations. Half the rotated objects were viewed in the orientation that matched the earlier presentations, and half were viewed at an orientation that mismatched the earlier presentations. Systematic effects of orientation on naming time were found during the early presentations. These effects were reduced during later presentations, and the size of this reduction did not depend on the orientation in which the object had been seen originally. The results are consistent with a dual-systems model of object identification in which initially large effects of disorientation are the result of a normalization process such as mental rotation, and in which attenuation of the effects is due to a shift from the normalization system to a feature/part-based 相似文献
938.
The theoretical distinction between an articulatory control process and a short-term phonological store was supported in five experiments on immediate serial recall. In Experiment 1, articulatory suppression during the presentation and recall of auditory material abolished the word length effect but not the phonemic similarity effect. In Experiment 2, the two latter effects were found to be independent with auditory presentation. In Experiment 3, the effects of irrelevant speech and word length were found to be independent with visual presentation. In Experiment 4, articulatory suppression during the presentation and recall of auditory material abolished the phonemic similarity effect with a slow presentation rate. Nevertheless, in Experiment 5, articulatory suppression with a conventional presentation rate did not reduce the effect of phonemic similarity, even when a 10-sec interval was interposed between presentation and recall. These results indicate that the encoding, maintenance, and retrieval of spoken material within the phonological store do not depend on a process of articulatory rehearsal. 相似文献
939.
A study is reported that tests the hypothesis that group members exhibit intergroup bias in response to the belief that outsiders will discriminate against them. To this end, two experimental conditions are included in which subjects anticipate either biased evaluations or fair evaluations respectively. In a control condition, subjects do not expect to be evaluated from an external source. Results indicated, as expected, that those who anticipated biased evaluations from an outgroup exhibited bias themselves, while those who anticipated fair evaluations exhibited outgroup favouritism. The fact that control subjects exhibited the same degree of bias as those who anticipated biased evaluations from the outgroup poses some difficulties for the hypothesized connection between anticipated discrimination and intergoup bias. Thus, it appears that intergroup bias is the rule and not the exception in an intergroup context. Nevertheless, it is clear that anticipated evaluations of outgroup members can effect intergroup bias. 相似文献
940.