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   42873篇
  免费   1820篇
  国内免费   27篇
  44720篇
  2020年   467篇
  2019年   584篇
  2018年   827篇
  2017年   812篇
  2016年   896篇
  2015年   616篇
  2014年   756篇
  2013年   3780篇
  2012年   1404篇
  2011年   1445篇
  2010年   871篇
  2009年   936篇
  2008年   1287篇
  2007年   1272篇
  2006年   1143篇
  2005年   1057篇
  2004年   1051篇
  2003年   977篇
  2002年   1031篇
  2001年   1256篇
  2000年   1225篇
  1999年   962篇
  1998年   517篇
  1997年   495篇
  1996年   444篇
  1995年   472篇
  1994年   417篇
  1993年   452篇
  1992年   791篇
  1991年   723篇
  1990年   698篇
  1989年   661篇
  1988年   652篇
  1987年   593篇
  1986年   594篇
  1985年   662篇
  1984年   599篇
  1983年   569篇
  1982年   486篇
  1979年   598篇
  1978年   491篇
  1977年   441篇
  1976年   461篇
  1975年   489篇
  1974年   580篇
  1973年   565篇
  1972年   471篇
  1968年   480篇
  1967年   425篇
  1966年   414篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
971.
972.
People become subject to political and social violence when governments fail to give priority to basic health care or education. Attempts to meet foreign obligations also produce severe economic recessions which further impede efforts to improve the general quality of life of disadvantaged populations. Since multiple factors contribute to violence, a multidisciplinary approach is best suited to address the problem. For example, poverty and its associated risks are linked to violence, but living in poverty does not necessarily engender violence. Living in poverty may, however, fuel high rates of child mortality, illiteracy, malnutrition, excessive population growth, street children, and familial disintegration. An integrated action program was developed in Brazil for at-risk individuals and their families based upon the idea of building and reinforcing family ties and intergenerational togetherness. Undernourished infants, street children, the handicapped, women subjected to violence, and neglected senior citizens received special interventions in the program described in the text.  相似文献   
973.
The present study evaluated the efficacy of a new intervention, Guided Imaginal Coping (GIC), compared to imaginal exposure (IEX), and a waiting-list control (WLC) condition among 24 clinic outpatients meeting DSM-III-R criteria for panic disorder (PD) or PD with agoraphobia. GIC was the more consistently effective intervention, with individuals demonstrating significant improvement in frequency and severity of panic attacks (Pas) as well as significant reductions in physiological and subjective arousal to provocative imagery. Individuals in the IEX intervention demonstrated less consistent improvement on the dependent measures, while individuals in the WLC condition essentially remained unchanged. Both GIC and IEX were effective according to a composite measure of clinically significant improvement. However, only GIC was superior to the WLC condition when clinical improvement was defined as zero PAs at follow-up. These findings, while preliminary, suggest that GIC can be added to the armamentarium of effective approaches to treating PD.  相似文献   
974.
We examined the effects of a self-monitoring program on reducing the frequency of negative statements of a student with mild mental retardation who was enrolled in a self-contained classroom at a middle school. A changing criterion design was used within a multiple baseline design across two classroom periods. Additionally, the frequency of positive statements was reported. The results showed a decrease in the number of negative statements, and an increase in the number of positive statements. Maintenance data collected up to 8 weeks after the program ended indicated that the student continued to emit positive rather than negative statements. The use of this procedure to decelerate undesirable behavior is discussed.  相似文献   
975.
Research in a wide variety of domains provides converging evidence for the psychological unconscious—percepts, memories, and other mental contents that influence experience, thought, and action outside of phenomenal awareness. Studies of preconscious processing indicate that two continua underlie conscious experience—one having to do with the quality of the stimulus event or its mental representation, and the other having to do with the cognitive resources brought to hear on the processing of that representation. However, evidence of subconscious processing violates these conclusions and suggests that something more is involved—perhaps a link between mental representations of events and of the self as the agent or experiencer of them.  相似文献   
976.
We used delayed multiple-baseline and multiple-probe techniques to assess the effects of self-evaluation training on the legibility of cursive handwriting. Five secondary special education students with difficult-to-read handwriting served as participants. All participants improved the legibility of their handwriting during self-evaluation training. A systematic withdrawal of the training package demonstrated maintenance of treatment effects. For the most part, the students' handwriting remained at least 90% legible to judges following the systematic withdrawal of the self-evaluation training.  相似文献   
977.
978.
The notions of objects and attributes are essential to knowledge representation. Rudolf Wille’s concept lattices group objects and attributes into concepts, with concepts organized in a lattice, so that some concepts are subconcepts of others. This paper applies certain aspects of type theory to concept lattices in order better to facilitate the representation of knowledge inRoget’s International Thesaurus. Of particular interest is a formal analysis of functions providing concept lattices with a way of representing procedures and actions that currently are not present in the thesaurus.  相似文献   
979.
A collection of 4,741 word fragments that have a unique completion is described. All word fragments are specified by two letters (e.g.,__Q__U__can only be completed by the word LIQUEURS). The words completing these fragments range in length from five to nine letters. The fragments are unique with respect to a pool of 146,205 words, which helps rule out the possibility that obscure words could be used as a completion to the fragments. The collection of fragments as well as the words that complete them is available in ASCII format on computer disks or in printed form.  相似文献   
980.
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