首页 | 官方网站   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   7828篇
  免费   202篇
社会科学   8030篇
  2021年   52篇
  2020年   90篇
  2019年   129篇
  2018年   167篇
  2017年   244篇
  2016年   199篇
  2015年   149篇
  2014年   175篇
  2013年   1359篇
  2012年   296篇
  2011年   217篇
  2010年   175篇
  2009年   158篇
  2008年   192篇
  2007年   180篇
  2006年   138篇
  2005年   197篇
  2004年   174篇
  2003年   214篇
  2002年   232篇
  2001年   217篇
  2000年   192篇
  1999年   185篇
  1998年   143篇
  1997年   112篇
  1996年   127篇
  1995年   105篇
  1994年   97篇
  1993年   105篇
  1992年   125篇
  1991年   115篇
  1990年   112篇
  1989年   102篇
  1988年   110篇
  1987年   110篇
  1986年   103篇
  1985年   121篇
  1984年   97篇
  1983年   105篇
  1982年   74篇
  1981年   74篇
  1980年   69篇
  1979年   74篇
  1978年   77篇
  1977年   54篇
  1976年   42篇
  1975年   55篇
  1974年   47篇
  1973年   39篇
  1972年   39篇
排序方式: 共有8030条查询结果,搜索用时 31 毫秒
991.
992.
The existing empirical literature on the outcomes of marital and pre-marital enrichment programs is critically reviewed. While the majority of studies have used untreated control groups and appear to offer very striking evidence of meaningful change as a result of these enrichment experiences, several important methodological deficiencies are common to these investigations and, therefore, require a cautious optimism about the efficacy of these programs. Six specific issues are addressed in an effort to improve the quality and utility of further research and practice in this area.  相似文献   
993.
994.
995.
996.
997.
This study provides additional information about casino gambling practices in two adolescent samples. Specifically, 109 adolescents from a religious high school and 84 adolescents from a juvenile detention facility in Las Vegas, Nevada were surveyed. Of these, 71 (36.8%) were found to gamble regularly (58 males, 13 females, mean age 15.9 years). Results indicated many similarities among the two groups. The overall sample appeared to have a strong affinity for casino gambling, were diverse in their practices and reasons for gambling, reported a variety of emotional and physiological behaviors when gambling, occasionally experienced problems from casino gambling, and had parents who generally approved and were aware of their children's gambling behavior. The accessibility and family-oriented nature of many new casinos may be responsible for these effects.The authors thank Nicole Giangregorio and Ned C. Silver for their assistance. Portions of this paper were presented at the meeting of the Rocky Mountain Psychological Association, Boulder, CO.  相似文献   
998.
999.
This article describes a method for reclassifying causes of death in the Netherlands for the period 1875–1992. Two criteria should be met to obtain a useful classification to study the epidemiological transition. First, the categories should be nosologically continuous over the period under study and second, there should be enough detail in causes which are important in the context of the epidemiological transition viz. communicable diseases, non-communicable diseases and external causes of death. A method developed by Vallin and Meslé (1988), which involves ‘dual correspondence tables’ and ‘fundamental associations’, was used to create nosologically continuous categories. These categories were tested for statistical continuity during the transition years of one ICD-revision to the next, using ordinary least squares regression analysis. The reclassification procedure resulted in a nested classification consisting of three levels of refinement of causes of death: 27 causes, 1875–1992; 65 causes, 1901–1992; and 92 causes, 1931–1992. On the basis of this classification, 43% of all deaths in 1875–79 and 98% of all deaths in 1992 could be allocated to either communicable diseases, non-communicable diseases or external causes.  相似文献   
1000.
This article considers the objectives of an industrial policy that would develop national strategies for world markets. It describes the tools used to implement such strategies and how the strategies would be organized. The author also considers some of the advantages and disadvantages of developing national strategies for world markets.  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-23

京公网安备 11010802026262号