全文获取类型
收费全文 | 19145篇 |
免费 | 379篇 |
国内免费 | 7篇 |
专业分类
19531篇 |
出版年
2020年 | 258篇 |
2019年 | 267篇 |
2018年 | 388篇 |
2017年 | 394篇 |
2016年 | 414篇 |
2015年 | 325篇 |
2014年 | 347篇 |
2013年 | 1480篇 |
2012年 | 629篇 |
2011年 | 711篇 |
2010年 | 417篇 |
2009年 | 401篇 |
2008年 | 542篇 |
2007年 | 513篇 |
2006年 | 461篇 |
2005年 | 386篇 |
2004年 | 395篇 |
2003年 | 380篇 |
2002年 | 387篇 |
2001年 | 722篇 |
2000年 | 719篇 |
1999年 | 491篇 |
1998年 | 212篇 |
1997年 | 210篇 |
1996年 | 163篇 |
1995年 | 165篇 |
1993年 | 171篇 |
1992年 | 390篇 |
1991年 | 344篇 |
1990年 | 369篇 |
1989年 | 352篇 |
1988年 | 334篇 |
1987年 | 308篇 |
1986年 | 328篇 |
1985年 | 318篇 |
1984年 | 250篇 |
1983年 | 219篇 |
1981年 | 152篇 |
1979年 | 215篇 |
1978年 | 180篇 |
1975年 | 195篇 |
1974年 | 250篇 |
1973年 | 208篇 |
1972年 | 206篇 |
1971年 | 175篇 |
1970年 | 152篇 |
1969年 | 200篇 |
1968年 | 202篇 |
1967年 | 165篇 |
1966年 | 182篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
Maner JK DeWall CN Baumeister RF Schaller M 《Journal of personality and social psychology》2007,92(1):42-55
Evidence from 6 experiments supports the social reconnection hypothesis, which posits that the experience of social exclusion increases the motivation to forge social bonds with new sources of potential affiliation. Threat of social exclusion led participants to express greater interest in making new friends, to increase their desire to work with others, to form more positive impressions of novel social targets, and to assign greater rewards to new interaction partners. Findings also suggest potential boundary conditions to the social reconnection hypothesis. Excluded individuals did not seem to seek reconnection with the specific perpetrators of exclusion or with novel partners with whom no face-to-face interaction was anticipated. Furthermore, fear of negative evaluation moderated responses to exclusion such that participants low in fear of negative evaluation responded to new interaction partners in an affiliative fashion, whereas participants high in fear of negative evaluation did not. 相似文献
993.
Minassian K Persy I Rattay F Pinter MM Kern H Dimitrijevic MR 《Human movement science》2007,26(2):275-295
We have demonstrated that non-patterned electrical stimulation of the lumbar cord can induce stepping-like activity in the lower limbs of complete spinal cord injured individuals. This result suggested the existence of a human lumbar locomotor pattern generator, which can convert a tonic input to a rhythmic motor output. We have studied the human lumbar cord in isolation from supraspinal input but under extrinsic tonic input delivered by spinal cord stimulation. Large-diameter afferents within the posterior roots are directly depolarized by the electrical stimulation. These afferents project to motoneurons as well as to lumbar interneurons involved in the motor control of lower limbs. Stimulation at 25-50 Hz can elicit rhythmic alternating flexion/extension movements of the lower limbs in supine individuals. Reducing the tonic input frequency to 5-15 Hz initiates lower limb extension. Epidural stimulation applied during manually assisted treadmill stepping in complete spinal cord injured persons immediately increases the central state of excitability of lumbar cord networks and enhances stepping-like functional motor outputs. Sustained, non-patterned tonic input via the posterior roots can activate human lumbar cord networks. Pattern generating configurations of these multifunctional circuitries can be set-up depending on the stimulation parameters and particularly on the input frequency. 相似文献
994.
Eric A. Storch Tanya K. Murphy Rhea M. Chase Mary Keeley Wayne K. Goodman Maurice Murray Gary R. Geffken 《Journal of psychopathology and behavioral assessment》2007,29(4):211-219
The present study analyzed rates of peer victimization in children with a chronic tic disorder as compared to children with
type 1 diabetes and healthy controls. The associations among peer victimization, tic symptom severity, and psychological symptoms,
as well as the potential mediating relationship between peer victimization, tic severity, and child internalizing symptoms,
were also explored. Children with tics displayed higher rates of peer victimization than control groups, and peer victimization
in children with tics was positively correlated with tic symptom severity, loneliness, anxiety symptoms, and parent report
of child internalizing symptoms. Results also supported the hypothesis that peer victimization mediates the relationship between
tic symptom severity and loneliness. Findings highlight the importance of the assessment and treatment of psychosocial variables
in children with chronic tic disorders, including social functioning and peer relationships. 相似文献
995.
Christopher T. Barry Paul J. Frick Kristy K. Adler Sarah J. Grafeman 《Journal of child and family studies》2007,16(4):508-521
We examined the predictive utility of narcissism among a community sample of children and adolescents (N=98) longitudinally. Analyses focused on the differential utility between maladaptive and adaptive narcissism for predicting
later delinquency. Maladaptive narcissism significantly predicted self-reported delinquency at one-, two-, and three-year
follow-ups. This pattern held even when considering other intrapersonal risk factors for conduct problems (i.e., callous-unemotional
traits, impulsivity), parenting practices, and when controlling for earlier conduct problems. In addition, adaptive narcissism
was predictive of delinquency in the absence of positive parenting practices, with maladaptive narcissism being particularly
predictive of delinquency in the presence of negative parenting. The implications for understanding delinquency in terms of
the social and motivational characteristics that are the hallmark of maladaptive narcissism are discussed. 相似文献
996.
Matthew K. Nock Caitlin Ferriter Elizabeth Holmberg 《Journal of child and family studies》2007,16(1):27-38
We assessed parents’ beliefs about treatment credibility and effectiveness and examined the influence of these beliefs on
subsequent treatment participation. Seventy-six parents completed the Credibility/Expectancies Questionnaire—Parent Version
(CEQ-P), and subsequently participated in treatment for their child's clinically referred conduct problems. The key findings
were that: (a) the CEQ-P is composed of two components that measure parents’ treatment credibility and expectancies; (b) the
total scale and each component are internally consistent and have strong test-retest reliability; (c) scores on the CEQ-P
are significantly associated with scores on a measure of parent motivation for treatment, supporting the construct validity
of this measure; and (d) scores on the CEQ-P at the first clinic visit significantly predict subsequent adherence to treatment
procedures above and beyond demographic variables and parent motivation for treatment. This study provides an efficient and
psychometrically sound measure of parent beliefs about treatment and demonstrates the importance of such beliefs for subsequent
treatment adherence. 相似文献
997.
The purposes of this study were (a) to estimate the annual prevalence of, and to identify the predictors of, sexual infidelity in a population-based sample of married women (N = 4,884); and (b) to evaluate whether the prevalence and predictors of infidelity varied as a function of whether the assessment of infidelity was based on a face-to-face interview versus a computer-assisted self-interview. Annual prevalence of infidelity was much smaller on the basis of the face-to-face interview (1.08%) than on the computer-assisted self-interview (6.13%). Although many of the predictor variables replicated results from previous studies (e.g., demographic variables, religiosity, sexual experience), findings also indicated that childhood sexual abuse (i.e., forced sex) predicted greater probability of infidelity. Finally, the magnitude of the association with infidelity for 4 of the 9 predictor variables differed between the 2 methods for assessing infidelity. This study's findings underscore the importance of assessing infidelity with methods such as computer-assisted self-interviews that minimize the influence of social desirability and impression management. 相似文献
998.
Visual cortical areas are involved in a variety of somatosensory tasks in the sighted, including tactile perception of two-dimensional patterns and motion, and haptic perception of three-dimensional objects. It is still unresolved whether visual imagery or modality-independent representations can better explain such cross-modal recruitment. However, these explanations are not necessarily in conflict with each other and might both be true, if imagery processes can access modality-independent representations. Greater visual cortical engagement in blind compared to sighted people is commonplace during language tasks, and also seems to occur during processing of tactile spatial information. Such engagement is even greater in the congenitally blind compared to the late blind, indicative of enhanced cross-modal plasticity during early development. At the other extreme, short-term visual deprivation of the normally sighted also leads to cross-modal plasticity. Altogether, the boundaries between sensory modalities appear to be flexible rather than immutable. 相似文献
999.
1000.
Childhood obesity is increasingly prevalent in Western and non-Western societies. The authors related multiple dimensions of physical self-concept to body composition for 763 Chinese children aged 8 to 15 and compared the results with Western research. Compared with Western research, gender differences favoring boys were generally much smaller for physical self-concept and body image. Objective and subjective indexes of body fat were negatively related to many components of physical self-concept, but--in contrast to Western research--were unrelated to global self-esteem and slightly positively related to health self-concept. In support of discrepancy theory, actual-ideal discrepancies in body image were related to physical self-concept. However, consistent with the Chinese cultural value of moderation, and in contrast to Western results, being too thin relative to personal ideals was almost as detrimental as being too fat. The results reflect stronger Chinese cultural values of moderation and acceptance of obesity than in Western culture and have implications for social and educational policy in China. 相似文献