全文获取类型
收费全文 | 1924篇 |
免费 | 73篇 |
出版年
2020年 | 30篇 |
2018年 | 26篇 |
2017年 | 35篇 |
2016年 | 37篇 |
2015年 | 33篇 |
2014年 | 40篇 |
2013年 | 203篇 |
2012年 | 75篇 |
2011年 | 55篇 |
2010年 | 34篇 |
2009年 | 31篇 |
2008年 | 57篇 |
2007年 | 59篇 |
2006年 | 55篇 |
2005年 | 54篇 |
2004年 | 53篇 |
2003年 | 47篇 |
2002年 | 63篇 |
2001年 | 33篇 |
2000年 | 28篇 |
1999年 | 27篇 |
1998年 | 33篇 |
1997年 | 31篇 |
1996年 | 37篇 |
1995年 | 36篇 |
1994年 | 32篇 |
1993年 | 25篇 |
1992年 | 27篇 |
1991年 | 30篇 |
1990年 | 31篇 |
1989年 | 27篇 |
1988年 | 18篇 |
1987年 | 23篇 |
1986年 | 21篇 |
1985年 | 35篇 |
1984年 | 34篇 |
1983年 | 34篇 |
1982年 | 35篇 |
1981年 | 28篇 |
1980年 | 36篇 |
1979年 | 30篇 |
1978年 | 29篇 |
1977年 | 39篇 |
1976年 | 40篇 |
1975年 | 24篇 |
1974年 | 41篇 |
1973年 | 28篇 |
1972年 | 14篇 |
1969年 | 16篇 |
1967年 | 15篇 |
排序方式: 共有1997条查询结果,搜索用时 15 毫秒
151.
An adult California sea lion (Zalophus californianus) with extensive experience in performing discrimination learning tasks was tested to evaluate her long-term memory for two
previously learned concepts. An associative concept, that of equivalence classification, was retested after a retention interval
of approximately 1 year. The sea lion had originally shown emergent equivalence classification with nonsimilarity-based classes
of stimuli in a simple discrimination repeated-reversal procedure as well as in a matching-to-sample procedure. The 1-year
memory test revealed no decrement in classification performance in either procedure. A relational concept, that of generalized
identity matching, was retested after approximately 10 years. The sea lion had originally received trial-and-error exemplar
training with identity matching-to-sample problems prior to transferring the concept to novel stimulus configurations. In
the 10-year memory test, the sea lion immediately and reliably applied the previously established identity concept to familiar
and novel sets of matching problems. These are the first reports of long-term conceptual memory in a nonprimate species. The
experimental findings are consistent with a variety of observations of sea lions in natural settings, which indicate that
natal sites, feeding areas, and individuals may be remembered over long periods of time. Electronic Supplementary Material is available if you access this article at http://dx.doi.org/10.1007/s10071-002-0153-8. On that page (frame on the left side),
a link takes you directly to the supplementary material.
Electronic Publication 相似文献
152.
Psychosocial Treatment Strategies in the MTA Study: Rationale, Methods, and Critical Issues in Design and Implementation 总被引:5,自引:0,他引:5
Wells KC Pelham WE Kotkin RA Hoza B Abikoff HB Abramowitz A Arnold LE Cantwell DP Conners CK Del Carmen R Elliott G Greenhill LL Hechtman L Hibbs E Hinshaw SP Jensen PS March JS Swanson JM Schiller E 《Journal of abnormal child psychology》2000,28(6):483-505
The Collaborative Multimodal Treatment Study of Children with Attention Deficit Hyperactivity Disorder (ADHD), the MTA, is the first multisite, cooperative agreement treatment study of children, and the largest psychiatric/psychological treatment trial ever conducted by the National Institute of Mental Health. It examines the effectiveness of Medication vs. Psychosocial treatment vs. their combination for treatment of ADHD and compares these experimental arms to each other and to routine community care. In a parallel group design, 579 (male and female) ADHD children, aged 7–9 years, 11 months, were randomly assigned to one of the four experimental arms, and then received 14 months of prescribed treatment (or community care) with periodic reassessments. After delineating the theoretical and empirical rationales for Psychosocial treatment of ADHD, we describe the MTA's Psychosocial Treatment strategy applied to all children in two of the four experimental arms (Psychosocial treatment alone; Combined treatment). Psychosocial treatment consisted of three major components: a Parent Training component, a two-part School Intervention component, and a child treatment component anchored in an intensive Summer Treatment Program. Components were selected based on evidence of treatment efficacy and because they address comprehensive symptom targets, settings, comorbidities, and functional domains. We delineate key conceptual and logistical issues faced by clinical researchers in design and implementation of Psychosocial research with examples of how these issues were addressed in the MTA study.Deceased 相似文献
153.
This study investigated the types of self-reported main problems that persons report many years following a traumatic brain injury. This preliminary study is part of a large ongoing study of disability and handicap in adults following traumatic brain injury. As part of an extensive interview, subjects were asked an open-ended question regarding their current main problems which they thought resulted from their traumatic brain injury. Responses were obtained from 166 adult subjects (119 men and 47 women) whose time postinjury ranged from 9 to 24 years. Categories for responses were subsequently developed. The most commonly reported categories of problems were those relating to movement (39%), cognition (36%), and sensory impairment (31%). Findings suggest that subjects' long-term concerns were related to specific impairments more than to psychosocial, emotional, or behavioral issues. Methodological issues concerning this research are discussed in relation to findings. 相似文献
154.
Steinkraus Warren E. Jager Ronald Rust E. C. 《International Journal for Philosophy of Religion》1977,8(4):268-272
International Journal for Philosophy of Religion - 相似文献
155.
156.
There is growing evidence that participation in constructive leisure activities facilitates positive youth development. Empirical evidence also supports the influence of families and communities on positive developmental outcomes for adolescents. This study examined the relationship among attitudes toward family and community, participation in structured out-of-school activities, and pro-social behavior. As predicted, community aspects such as opportunities available and the attitudes the youth held toward the community, as well as their attitude toward family were predictive of activity involvement. Activity involvement, in turn, was predictive of pro-social behavior. Attitude toward family was also predictive of attitude toward the community. Attitude toward community was a direct predictor of the positive developmental outcome of pro-social behavior, although contrary to the original hypothesis, family influences did not have a direct effect on pro-social behavior. Implications for continued practice and change for a variety of sectors in the positive youth development field such as educators and educational institutions, youth-serving organizations, families, and policy makers are discussed, along with recommendations for continued research in this field. 相似文献
157.
Price sensitivity is how consumers react to price levels and to price changes. Consumer innovativeness is a tendency to welcome and to adopt new products. Researchers (e.g., R. E. Goldsmith & S. J. Newell, 1997) consider innovative consumers relatively more price insensitive than other consumers, so there should be a negative correlation between measures of these constructs. The results of the present study supported the psychometric soundness of a self-report measure of price sensitivity among 860 Korean consumers and replicated earlier findings of the negative correlation between the 2 constructs. 相似文献
158.
Three studies examine the psychometric properties (i.e., the test-retest reliability, convergent, and discriminant validity) of Fraley, Waller, and Brennan's Revised Experiences in Close Relationships (ECR-R) self-report measure of romantic attachment anxiety (model of self) and avoidance (model of others). Longitudinal analyses suggest that the ECR-R provided highly stable indicators of latent attachment during a 3-week period (85% shared variance). Hierarchical linear modeling analyses further validated the ECR-R, suggesting that it explained between 30% to 40% of the between-person variation in social interaction diary ratings of attachment-related emotions experienced during interactions with a romantic partner and only 5% to 15% of that in interactions with family and friends. Guidelines are offered regarding the conditions where highly reliable and precise measures of romantic attachment, such as the ECR-R, are deemed necessary and where shorter, albeit slightly less reliable measures, such as Bartholomew and Horowitz's Relationship Questionnaire, may also be viable. 相似文献
159.
Swaisgood RR White AM Zhou X Zhang G Lindburg DG 《Journal of comparative psychology (Washington, D.C. : 1983)》2005,119(3):325-334
This study investigated the responses of 14 giant pandas (Ailuropoda melanoleuca) to 5 enrichment items (3 manipulable objects, 2 feeding devices) that possess different properties affording varying behavioral opportunities. Enrichment items were quantitatively described by using 12 properties. Pandas displayed no preferences among the 5 enrichment treatments, all of which had similar positive effects on behavioral measures of well-being (behavioral diversity, stereotypy). However, each item promoted a distinct behavioral profile, readily mapped onto the enrichment's properties. These results suggest that it may be important to stimulate behavioral diversity but that specific behaviors or enrichment properties are not required. The unique behavioral topography seen with these enrichments also suggests that providing multiple enrichments with varying properties will maximize overall behavioral diversity. 相似文献
160.
Green RM 《Kennedy Institute of Ethics journal》2005,15(1):101-106
H.G. Wells warned, in 1895, not to allow economic injustices to become so acute that they ultimately transform human biology. Wells's warning is all the more pertinent today as society contemplates the use of biotechnologies to manipulate or "enhance" the human genome. 相似文献