全文获取类型
收费全文 | 62754篇 |
免费 | 2603篇 |
国内免费 | 22篇 |
专业分类
65379篇 |
出版年
2020年 | 758篇 |
2019年 | 912篇 |
2018年 | 1260篇 |
2017年 | 1302篇 |
2016年 | 1370篇 |
2015年 | 991篇 |
2014年 | 1204篇 |
2013年 | 5597篇 |
2012年 | 2188篇 |
2011年 | 2182篇 |
2010年 | 1360篇 |
2009年 | 1349篇 |
2008年 | 1916篇 |
2007年 | 1871篇 |
2006年 | 1708篇 |
2005年 | 1438篇 |
2004年 | 1491篇 |
2003年 | 1415篇 |
2002年 | 1407篇 |
2001年 | 2014篇 |
2000年 | 1875篇 |
1999年 | 1442篇 |
1998年 | 734篇 |
1997年 | 631篇 |
1996年 | 695篇 |
1995年 | 659篇 |
1994年 | 624篇 |
1993年 | 610篇 |
1992年 | 1189篇 |
1991年 | 1102篇 |
1990年 | 1068篇 |
1989年 | 1023篇 |
1988年 | 994篇 |
1987年 | 915篇 |
1986年 | 920篇 |
1985年 | 975篇 |
1984年 | 819篇 |
1983年 | 729篇 |
1982年 | 569篇 |
1981年 | 588篇 |
1979年 | 859篇 |
1978年 | 678篇 |
1977年 | 572篇 |
1976年 | 564篇 |
1975年 | 694篇 |
1974年 | 774篇 |
1973年 | 758篇 |
1972年 | 661篇 |
1971年 | 602篇 |
1968年 | 647篇 |
排序方式: 共有10000条查询结果,搜索用时 7 毫秒
991.
A sample of 2,453 grade school children were followed into young adulthood through record sources. Teacher interviews provided information about low-peer-status children that was assessed in relation to subsequent delinquency for both sexes and young adult criminality for males. A multivariate design evaluated the joint effects of social class, a measure of family disturbance, and childhood problem behavior factors as antecedents of delinquency. Childhood aggression emerged as the most prominent antecedent factor for males but not for females. Social class and family disturbance were associated with aggression but did not have significant direct effects on delinquency. Aggression was related to severity of delinquency. Dispositional status, reflecting severity, was the best indicator of which delinquent males would have adult criminal records. A causal model is presented.The study was supported by a grant from the Scottish Rite Schizophrenia Research Program, N.M.J., U.S.A. Portions of the study were presented at the Life History Research conference in Monterey, California, 1981. The authors wish to thank June White, Cindy Hanson, and Ned Worell for their help in conducting this research. Data for this research was originally gathered by Merrill Roff. Follow-up data were contributed by Ronald Peek, Donald Bamber, Charles Watson, Shiela Makie, William S. Ward, Edward S. Posey, Chris Hemlabs, and Harriet Barnes. 相似文献
992.
993.
The empirical research pertaining to the effectiveness of telephone counseling and referral systems personnel was critically reviewed. The assessment was organized according to several evaluation strategies that researchers have utilized to evaluate effectiveness. These strategies included, for example, client self-reports, client "shows" versus "no-shows" following referral, data pertaining to suicide rates, counselor ratings of personal effectiveness, and phone workers' ability to offer empathy to clients. It was concluded that discussions of effectiveness should be constrained by a careful consideration of the specific index of efficacy chosen by investigators as well as methodological issues associated with current research in this area. There is reason to believe that the availability of telephone crisis services may be related to reduced suicide rates among young white females. Also, there is a significant need to empirically associate counseling technique and indices of effectiveness with substantive measures of client outcome in future research. Additional topics reviewed include the probable differential effectiveness of lay workers with various presenting problems of clients, and the role that training and maturity seem to play in successful interventions. Guidelines for the use of evaluation techniques which coincide with service goals are also offered. 相似文献
994.
995.
996.
997.
Exposure to electric shock produces an analgesic reaction (SIA) that is reversed by opiate antagonists ("opioid" SIA) under some conditions but not under other conditions ("nonopioid" SIA). A number of studies using tail-flick to radiant heat as the measure of pain sensitivity have found that a small number of shocks lead to nonopioid SIA, while a large number of shocks produce opioid SIA. In contrast, a small number of shocks have been reported to produce opioid SIA when the Formalin test was used to measure pain reactivity. However, the Formalin test involves administering a chronic pain stimulus (injection of Formalin into the paw) for an extended period before the shocks. Here it is reported that this "preexperimental" stress is sufficient to convert the SIA after a small number of shocks measured by tail-flick to the opioid form. 相似文献
998.
James J. Conley 《Personality and individual differences》1984,5(1):11-25
When viewed in the aggregate, studies of the longitudinal consistency of intelligence, personality traits and self-opinion (self-esteem, life satisfaction etc.) show a hierarchy of consistency. Uncorrected retest coefficients over periods of 6 months to 50 yr are analyzed as the product of period-free reliability (R) and the true stability of the construct (sn, where s is the coefficient of annual stability and n the number of years of the retest interval). The annual stabilities of intelligence, personality traits and self-opinions are estimated as 0.99, 0.98 and 0.94, respectively. While intelligence and personality may be regarded as relatively stable characteristics over the length of the adult lifespan, self-opinion has little stability over periods of more than 10 yr. The hierarchy of consistency should be taken into account in causal models of human development. Although self-opinion is not a longitudinally-stable characteristics, it may still be predicted over long periods of time by higher-order constructs such as personality traits and intelligence. 相似文献
999.
The purpose of this study was to examine whether apraxic-aphasic patients with parietal lesions had difficulty learning lists of gestures and whether the performance deficits they displayed resulted from an inability either to consolidate this information in memory or to retrieve the information once stored. The findings indicate that apraxic-aphasic patients do have difficulty acquiring lists of gestures. This inability to reproduce gestural information was not associated with a retrieval disorder, but instead the apraxic-aphasic subjects could not consolidate the information in memory. 相似文献
1000.
Glynis M. Breakwell Barbara Harrison Carol Propper 《British Journal of Guidance & Counselling》1984,12(2):132-140
Evidence of the effects of duration of unemployment and gender upon the psychological response to unemployment is reviewed. It is suggested that many of the apparent contradictions in this evidence can be resolved by reference to situational factors which shape how stressful unemployment is for a particular individual. The study reported tested the effects of a stressful period of unemployment on the psychological well-being, self-esteem and life-satisfaction of young people. No sex differences in response to unemployment were found, and this is explained in terms of the similarity of their experiences. The relevance of these findings for counselling the unemployed is discussed. 相似文献