首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   189847篇
  免费   8249篇
  国内免费   158篇
  2020年   2800篇
  2019年   3442篇
  2018年   3594篇
  2017年   4051篇
  2016年   4673篇
  2015年   3934篇
  2014年   4803篇
  2013年   23475篇
  2012年   4934篇
  2011年   4085篇
  2010年   4003篇
  2009年   4837篇
  2008年   4242篇
  2007年   3778篇
  2006年   4284篇
  2005年   4287篇
  2004年   3777篇
  2003年   3390篇
  2002年   3207篇
  2001年   3943篇
  2000年   3767篇
  1999年   3522篇
  1998年   2883篇
  1997年   2702篇
  1996年   2629篇
  1995年   2450篇
  1994年   2407篇
  1993年   2379篇
  1992年   3033篇
  1991年   2861篇
  1990年   2738篇
  1989年   2600篇
  1988年   2546篇
  1987年   2597篇
  1986年   2594篇
  1985年   2857篇
  1984年   2795篇
  1983年   2521篇
  1982年   2453篇
  1981年   2427篇
  1980年   2236篇
  1979年   2568篇
  1978年   2329篇
  1977年   2282篇
  1976年   2105篇
  1975年   2354篇
  1974年   2470篇
  1973年   2415篇
  1972年   1974篇
  1971年   1898篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
941.
The present study was designed to assess whether the conversational behavior of children separated into accepted, rejected, and mixed-status dyads differed along the dimensions of listening to, paying attention to, and indicating interest in their dyadic partner. Conversations of 40 third-grade dyads were analyzed as they occurred in a 2- min waiting period and a 4- min conversation period. Seventeen categories of verbal behaviors that indexed these dimensions were used as content codes. Multivariate analyses of variance performed on the observational data yielded significant main effects for status, sex, and experimental condition. Results are interpreted in terms of previous social skills research, and suggestions for future research are offered.  相似文献   
942.
The nonrandom distribution of situational fears has been explained by evolutionary survival relevance of specific fears. Thirty-eight stimuli were taken from the literature on preparedness and were scored on fearfulness, objective dangerousness, and spatiotemporal unpredictability by three separate groups of students. The same items were scored on survival relevance by 15 biologists. Fearfulness of cues significantly correlated not only with survival relevance but also, and even more strongly, with dangerousness and unpredictability. While the fear/survival relevance association virtually disappeared when the unpredictability contribution was partialed out, the fear/unpredictability correlation was only marginally affected when controlling for survival relevance. This suggests that nonrandomness of feared stimuli may result from the spatiotemporal unpredictability that is attributed to these stimuli. The current practice of using snakes and spiders as phobia-relevant, and flowers and mushrooms as neutral, cues was not justified by the ratings of the 15 independent experts.This study was supported in part by a grant from the Dutch Organization for Fundamental Research (ZWO/Psychon, 560-268-001).  相似文献   
943.
Past research on delinquency and crime has provided convincing data about correlates but not about causes, because it has been largely cross-sectional in design. Whereas cross-sectional research focuses on variations between subjects, longitudinal research can provide information about changes within subjects, which are more important for causes, prevention, and treatment. Many of the most important results in criminology have been obtained in longitudinal or experimental studies, and the major studies of these types are reviewed here. It is now desirable to combine the two methods in a new coordinated program of longitudinal studies including experimental interventions or quasi-experimental analyses. Such projects could study several overlapping cohorts, extend from birth to adulthood, have frequent data collection, and obtain data from a variety of sources about many different types of antisocial behavior.  相似文献   
944.
Study of adolescent violence has been impeded by failure to distinguish among the circumstances in which youth engage in violent behavior. The present study investigated MMPI profiles of 36 adolescent murderers and a control group of 18 adolescents charged with larceny. Homicide cases were subgrouped into those who committed homicide secondary to another crime (e.g., robbery or rape) and those who acted in the context of interpersonal conflict with the victim. While there were no significant differences between homicide and larceny groups, crime and conflict subgroups were significantly different on scales F, Hs, Hy, and Sc.  相似文献   
945.
This article is concerned with psychiatric recommendations for treatment at the Metropolitan Toronto Forensic Service (METFORS), a clinical assessment agency providing both 1-day and 30-day evaluations of criminal defendants in Toronto, Canada. Analysis of both psychiatric reports and quantitative research instruments demonstrated the saliency of treatment as a central forensic issue at METFORS. Among a sample of 592 defendants, 134 were considered in need of outpatient care. Persons recommended for hospitalization were most likely to exhibit histories of mental health rather than criminal justice contacts; to be arrested for nonviolent offenses; to manifest psychotic behavior while at METFORS; to be found unfit for bail, incompetent to stand trial, in need of further assessment and dangerous to self; and to experience higher rates of hospitalization, but lower levels of criminalization during the two years following their initial forensic assessment. Psychiatric reports at METFORS tended to merge recommendations for treatment and assessment; to suggest prison or probation as means for securing clinical treatment; and to provide little written support for judgments about the need for intervention. Along with competency and dangerousness, treatment is a key issue in forensic practice, and warrants further attention in the psycholegal literature.  相似文献   
946.
Clinical judgments on the treatability and prognosis of mentally disordered offeenders (MDO) may strongly influence legal dispositions and the availability of treatment resources. This study examined 1,238 discharge summaries for MDOs referred for court assessments. Psychiatrists evidenced marked variability in how often they recommended treatment and how frequently they judged patients to have a poor prognosis. Two logit analyses suggested that diagnosis and consultation by other clinicians were associated with (a) treatment recommendations (i.e., Axis I diagnosis and social work consultations) and (b) prognosis (i.e., Axis II diagnosis and psychology consultations).  相似文献   
947.
Young and older adults were presented with pictures for study. Their recognition of the information was tested at five retention intervals: immediately, and 48 hr, 1 week, 2 weeks, and 4 weeks later. The main finding of interest was that picture recognition did not show an age-related decline until the 1-week retention interval.  相似文献   
948.
Aging has previously been shown to produce a generalized proportional slowing of all cognitive operations. In contrast, the present results suggested that Alzheimer's disease produces a disproportionate reduction in the speed with which patients carry out one or more mental operations. The tasks that demented patients found particularly difficult involved either a self-directed search of their lexicon or the use of familiarity information.  相似文献   
949.
In this research we examined race, sex, and age differences in the factorial structure of Liang's (1985) model of subjective well-being that integrates the Affect Balance Scale and the Life Satisfaction Index A. In particular, we viewed the covariance structure of the items as a function of several parameter matrices. We analyzed the factorial invariance by testing hypotheses involving the equivalence constraints of one or more parameter matrices with regard to the following: White and Black subsamples, men and women, and the young-old and the old-old. Data for the research came from the 1974 Harris National Council on Aging Survey, Myths and Reality of Aging in America. Analysis of covariance structures, or LISREL, was used to assess the factorial invariance. Replicated race differences were found in the factorial structure, but sex and age differences were not found. Consistent race differences were found for the second-order factor loadings for negative affect.  相似文献   
950.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号