全文获取类型
收费全文 | 3739篇 |
免费 | 1451篇 |
专业分类
5190篇 |
出版年
2024年 | 3篇 |
2023年 | 14篇 |
2022年 | 12篇 |
2021年 | 86篇 |
2020年 | 108篇 |
2019年 | 400篇 |
2018年 | 306篇 |
2017年 | 416篇 |
2016年 | 409篇 |
2015年 | 362篇 |
2014年 | 324篇 |
2013年 | 573篇 |
2012年 | 312篇 |
2011年 | 237篇 |
2010年 | 262篇 |
2009年 | 228篇 |
2008年 | 209篇 |
2007年 | 123篇 |
2006年 | 120篇 |
2005年 | 119篇 |
2004年 | 90篇 |
2003年 | 98篇 |
2002年 | 106篇 |
2001年 | 84篇 |
2000年 | 69篇 |
1999年 | 36篇 |
1998年 | 9篇 |
1997年 | 6篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1994年 | 4篇 |
1993年 | 4篇 |
1992年 | 8篇 |
1991年 | 3篇 |
1990年 | 3篇 |
1989年 | 3篇 |
1987年 | 3篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1983年 | 3篇 |
1981年 | 2篇 |
1979年 | 2篇 |
1978年 | 4篇 |
1977年 | 3篇 |
1976年 | 2篇 |
1957年 | 1篇 |
1956年 | 1篇 |
1955年 | 2篇 |
1954年 | 2篇 |
1953年 | 3篇 |
排序方式: 共有5190条查询结果,搜索用时 15 毫秒
901.
Janet K. Bester‐Meredith Patricia A. Martin Catherine A. Marler 《Aggressive behavior》2005,31(2):189-199
Differences in the distribution of arginine vasopressin (AVP) and a subtype of AVP receptors, the V1a receptor, may explain dissimilarities in social behavior of monogamous and non‐monogamous rodents. Intracerebroventricular infusions of AVP and a V1a antagonist were used in sexually naive males of two mouse species, the monogamous and highly aggressive California mouse (Peromyscus californicus) and the non‐monogamous and less aggressive white‐footed mouse (P. leucopus), to begin testing the interaction between the social system of a species and the effects of AVP on aggression. Two testing conditions, the resident‐intruder aggression test (R‐I) and the neutral arena aggression test, were used because they may differ in function and underlying biological mechanisms. In the R‐I test, administration of the antagonist lengthened attack latencies in California mice. In contrast, blocking V1a receptors did not alter attack latencies in the R‐I test in white‐footed mice or in the neutral arena aggression test in both species. AVP also did not alter aggression in either species in either behavioral test. Overall, these results suggest that AVP may be more likely to be associated with offensive aggression as measured in the R‐I test than with neutral arena aggression and that the effects of AVP manipulations may differ between monogamous and non‐monogamous rodents. Aggress. Behav. 31:000–000, 2005. © 2005 Wiley‐Liss, Inc. 相似文献
902.
Gary J. Tedeschi Shu‐Hong Zhu Christopher M. Anderson Sharon Cummins Neil G. Ribner 《Journal of counseling and development : JCD》2005,83(4):416-424
Adolescent smokers need cessation help, but the question of how best to intervene remains unanswered. This article describes the empirically validated protocol of an established, well‐utilized adolescent telephone counseling program for smoking cessation, tailored to adolescent developmental needs and shown to increase clients' 6‐month prolonged abstinence rate significantly. Clinical issues addressed include client assessment, motivation, self‐efficacy, familial and social support, planning, coping, relapse‐sensitive call scheduling, and self‐image. Counselor training considerations are also discussed. 相似文献
903.
Marian J. Bakermans‐Kranenburg Marinus H. Van IJzendoorn Femmie Juffer 《Infant mental health journal》2005,26(3):191-216
Infant disorganized attachment is a major risk factor for problematic stress management and later problem behavior. Can the emergence of attachment disorganization be prevented? The current narrative review and quantitative meta‐analysis involves 15 preventive interventions (N = 842) that included infant disorganized attachment as an outcome measure. The effectiveness of the interventions ranged from negative to positive, with an overall effect size of d = 0.05 (ns). Effective interventions started after 6 months of the infant's age (d = 0.23). Interventions that focused on sensitivity only were significantly more effective in reducing attachment disorganization (d = 0.24) than interventions that (also) focused on support and parent's mental representations (d = ?0.04). Most sample characteristics were not associated with differences in effect sizes, but studies with children at risk were more successful (d = 0.29) than studies with at‐risk parents (d = ?0.10), and studies on samples with higher percentages of disorganized attachment in the control groups were more effective (d = 0.31) than studies with lower percentages of disorganized children in the control group (d = ?0.18). The meta‐analysis shows that disorganized attachments may change as a side effect of sensitivity‐focused interventions, but it also illustrates the need for interventions specifically focusing on the prevention of disorganization. 相似文献
904.
This article presents the problem of gangs on the island of Puerto Rico from a historical, economical, and political perspective. Some Puerto Rican historians are convinced that the gang problem in Puerto Rico is due to the political ambiguity and human rights violations of prison inmates (F. Picò, 1998). 相似文献
905.
906.
907.
Massetti GM Lahey BB Pelham WE Loney J Ehrhardt A Lee SS Kipp H 《Journal of abnormal child psychology》2008,36(3):399-410
The predictive validity of symptom criteria for different subtypes of ADHD among children who were impaired in at least one
setting in early childhood was examined. Academic achievement was assessed seven times over 8 years in 125 children who met
symptom criteria for ADHD at 4–6 years of age and in 130 demographically-matched non-referred comparison children. When intelligence
and other confounds were controlled, children who met modified criteria for the predominantly inattentive subtype of ADHD
in wave 1 had lower reading, spelling, and mathematics scores over time than both comparison children and children who met
modified criteria for the other subtypes of ADHD. In some analyses, children who met modified criteria for the combined type
had somewhat lower mathematics scores than comparison children. The robust academic deficits relative to intelligence in the
inattentive group in this age range suggest either that inattention results in academic underachievement or that some children
in the inattentive group have learning disabilities that cause secondary symptoms of inattention. Unexpectedly, wave 1 internalizing
(anxiety and depression) symptoms independently predicted deficits in academic achievement controlling ADHD, intelligence,
and other predictors. 相似文献
908.
909.
Li‐Chen Hsu 《决策行为杂志》2008,21(2):151-167
Experiments on three two‐person threshold public good provision games, namely, the simultaneous, sequential, and dictator games, are conducted to explore the motives behind giving. Players who move simultaneously are endowed with equal bargaining power, and players who move first are endowed with more bargaining power than players who move subsequently. Dictators are indubitably endowed with complete bargaining power. Since the differences between the bargaining powers of two players increase from the simultaneous to the sequential to the dictator game, comparisons among games allow us to trace whether the contribution behavior is motivated by fairness or is simply due to the strategic concern. The experimental evidence shows that the strategic concern explains the overall contribution behavior better than the motive of fairness. However, in the final round 26% of the dictators share the threshold evenly with their opponents, suggesting that some subjects do play fairly. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
910.
Juan M. Falomir‐Pichastor Gabriel Mugny Alain Quiamzade Fabrice Gabarrot 《European journal of social psychology》2008,38(4):587-600
Drawing on regulatory focus theory, the present work examined the motivations underlying intergroup attitudes expressed under conditions of majority versus minority support. In two studies, participants expressed their attitudes towards equality and non‐discrimination of foreigners and were informed that the equality and non‐discrimination principle was supported by either a majority or a minority. Regulatory focus was assessed as the extent to which participants felt promotion‐related and prevention‐related emotions when acting either inconsistently or consistently with the egalitarian principle. Results provided evidence supporting the hypothesis that attitudes are related to prevention emotions when supported by a majority, but to promotion emotions when supported by a minority. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献