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   189337篇
  免费   8346篇
  国内免费   157篇
  2020年   2809篇
  2019年   3459篇
  2018年   3703篇
  2017年   4134篇
  2016年   4746篇
  2015年   3954篇
  2014年   4827篇
  2013年   23635篇
  2012年   4952篇
  2011年   4237篇
  2010年   4159篇
  2009年   4892篇
  2008年   4443篇
  2007年   3945篇
  2006年   4399篇
  2005年   4320篇
  2004年   3799篇
  2003年   3477篇
  2002年   3247篇
  2001年   4209篇
  2000年   4055篇
  1999年   3721篇
  1998年   2913篇
  1997年   2731篇
  1996年   2634篇
  1995年   2471篇
  1994年   2443篇
  1993年   2387篇
  1992年   3079篇
  1991年   2917篇
  1990年   2791篇
  1989年   2648篇
  1988年   2596篇
  1987年   2595篇
  1986年   2594篇
  1985年   2815篇
  1984年   2790篇
  1983年   2507篇
  1982年   2453篇
  1981年   2428篇
  1980年   2266篇
  1979年   2504篇
  1978年   2352篇
  1977年   2276篇
  1976年   2090篇
  1975年   2294篇
  1974年   2372篇
  1973年   2311篇
  1972年   1856篇
  1971年   1737篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
Differences in school behavior and achievement between students from intact, reconstituted, and single-parent families were analyzed. Students from intact two-parent families had fewer absences and tardies, higher grade point averages, and fewer negative and more positive teacher behavioral ratings than did those from reconstituted and single-parent families.  相似文献   
972.
S Oz  A Tari  M Fine 《Adolescence》1992,27(105):193-202
Two projective techniques were employed to explore the psychological characteristics of teenage mothers who were found, in a previous study, to have experienced more traumatic childhoods than the nonmother control group. Part I, presented here, investigated ego development using the Loevinger Sentence Completion Test. (Part II, responses to a set of TAT cards, will appear in a subsequent issue of Adolescence.) In comparison with the nonmothers, teenage mothers demonstrated more mature ego development. This is in distinct contrast with most reports in the literature, and the ramifications of these results are discussed. In addition, content analyses of the responses to the Sentence Completion Test confirm the highly involved mother-daughter and negative father-daughter relationships found in the previous study with this sample.  相似文献   
973.
S A Sharlin  M Mor-Barak 《Adolescence》1992,27(106):387-405
This paper deals with girls aged 13 to 21 who have run away from home. Social workers who work with such girls point out that they are not a homogeneous population and that their motives can be very different. This study divides their motives for running away into two types, "running from" and "running to," and describes the specific personality traits associated with each. Findings indicate that girls who "run to" are younger, more impulsive, have an internal locus of control and a history of more runaways and longer periods of staying away from home. Girls who "run from," on the other hand, are older, more reflective, have an external locus of control and a history of fewer runaways and shorter periods away from home.  相似文献   
974.
975.
976.
Neutrality is a central concept within the theory of psychoanalytic technique. We spell out the major controversies in which the concept has become embroiled, and provide a definition that we believe coincides with actual psychoanalytic practice. We discuss its merits and weaknesses, noting also the negative consequences of relying on older definitions. We relate neutrality to the interpretive process, indicating ways interpretation protects neutrality and is made more effective by it. We discuss the complex and controversial relation between neutrality and the analyst's therapeutic intent.  相似文献   
977.
F. Hutton Barron   《Acta psychologica》1992,80(1-3):91-103
Use of approximate weights would greatly simplify decision analysis under certainty since detailed weight elicitation could be avoided. This paper examines the degree to which rank order information about weights can be used to identify a best alternative, or falling uniqueness prescribes an easily implemented rule for selecting a ‘best’ alternative. The prescribed rule uses as weights the centroid of the feasible region defined by the rank order information. In conjunction with the rule, the value of the rank order information can be determined using an ‘expected gain from weight precision’ (EGWP) measure, analogous to ‘expected value of perfect information’ in decision analysis under uncertainty.  相似文献   
978.
The main issue of this paper concerns the mediating role of risk appraisal in the relation between past and future behavior. We expected previous risky behavior to heighten risk appraisal, which, in turn, should stimulate preventive behavior. Results ofthree tests of this mediation hypothesis showed that past behavior was strongly related to future behavior; people who behaved hazardously in the past indicated that they tend to do so in the future. Generally, the expected relation between past behavior and risk appraisal was supported. More risky behavior in the past was associated with a heightened risk appraisal. Results also indicate a relation between risk appraisal and future behavior, but in the opposite direction as predicted. Heightened risk appraisal was related to increased levels of risk in future behavior. When predicting future behavior by both risk appraisal and past behavior the effect of risk appraisal on future behavior disappeared, while past behavior remained a strong predictor of future behavior. In a few cases risk appraisal still predicted future behavior when past behavior was controlled for. Unfortunately, these cases showed the opposite relation; i.e., heightened risk appraisal was related to more risky future behavior. Implications of these findings for research on the role of risk appraisal will be discussed.  相似文献   
979.
D Mates  K R Allison 《Adolescence》1992,27(106):461-474
A series of focus group interviews was used to identify major sources of stress and coping responses of Grade 10 students. Relationships with parents and family, work, and lack of money were found to be important sources of stress. Major coping responses included substance use and diversionary activities. Differences between academic streams (tracks) in sources of stress and coping responses were examined.  相似文献   
980.
Post SG 《America》1992,167(18):453-455
  相似文献   
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