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   904篇
  免费   62篇
各国政治   57篇
工人农民   77篇
世界政治   193篇
外交国际关系   72篇
法律   407篇
中国政治   13篇
政治理论   142篇
综合类   5篇
  2023年   17篇
  2022年   6篇
  2021年   12篇
  2020年   38篇
  2019年   36篇
  2018年   48篇
  2017年   56篇
  2016年   51篇
  2015年   39篇
  2014年   33篇
  2013年   105篇
  2012年   52篇
  2011年   34篇
  2010年   44篇
  2009年   31篇
  2008年   42篇
  2007年   50篇
  2006年   47篇
  2005年   38篇
  2004年   25篇
  2003年   18篇
  2002年   32篇
  2001年   16篇
  2000年   8篇
  1999年   6篇
  1998年   8篇
  1997年   7篇
  1996年   3篇
  1995年   5篇
  1994年   5篇
  1993年   1篇
  1992年   3篇
  1991年   4篇
  1990年   3篇
  1989年   1篇
  1988年   5篇
  1987年   1篇
  1986年   5篇
  1985年   6篇
  1984年   4篇
  1983年   5篇
  1982年   5篇
  1981年   2篇
  1978年   4篇
  1977年   2篇
  1975年   1篇
  1974年   1篇
  1967年   1篇
排序方式: 共有966条查询结果,搜索用时 15 毫秒
951.
European Journal on Criminal Policy and Research - A main point of contention in the policy areas of prostitution and sex trafficking is whether the purchase of sex should be criminalised, whether...  相似文献   
952.
The Journal of Technology Transfer - This paper studies the collaborations between entrepreneurial ventures and universities by investigating the “first match”, namely, the probability...  相似文献   
953.
The paper provides an overview of the most important results of a project on EU–Korea economic and regulatory relations funded by the European Commission. The paper first outlines the emergence and development of EU–Korea relations. In the second part, the paper presents the main findings clustered in three thematic areas. A first thematic area focuses on a discussion of the EU–Korea Free Trade Agreement. The second cluster analyzes EU–Korea cooperation on regulatory policies with a main focus on cooperation in the policy areas of security (arms trade and control), chemical regulation, environmental regulation, education, development cooperation and industrial policy. The third part focuses on EU–Korea cooperation concerning regional and international issues. In the third part, the paper presents the main recommendations which were formulated on the basis of the project.  相似文献   
954.
Park A 《Time》2011,178(22):54-6, 59-60, 62 passim
  相似文献   
955.
956.
957.
958.
Organic solvent abuse typically involves sniffing organic solvents to experience the mind-altering conditions they induce. In Republic of Korea, organic solvent abuse is a serious social problem, especially among teenagers. Several studies have addressed the effects of organic solvent abuse on mind and body, but there are no simple methods by which such abuse can be positively identified. In this report, we describe a method for analyzing toluene metabolites (toluene is the main ingredient of glue) in glue-sniffers' urine using (1)H NMR spectroscopy. Toluene is a commonly used solvent in the rubber, paint, plastics, leather, printing, and chemical industries. Inhaled toluene is metabolized to hippuric acid in the liver and excreted in the urine. Hippuric acid is known as a good biomarker for biological monitoring of toluene exposure. We have scanned hippuric acid and other toluene metabolites by NMR spectroscopy and performed statistical multivariate analysis of the data. Based on this analysis, we sought to determine parameters by which glue-sniffing (toluene inhalation) behavior may be verified. We also demonstrate the use of a pattern recognition method for accurate and efficient analysis of NMR data. In comparison to conventional methods, such as mass spectroscopy coupled with liquid chromatography or gas chromatography, nuclear magnetic resonance spectroscopy has several advantages, including simple sample preparation, non-destructive sampling, accuracy, short acquisition time, and reproducibility in the determination of urinary hippuric acid.  相似文献   
959.
Although the acculturation gap generally has been associated with poor mental health outcomes among Asian American children, some studies have failed to find a significant relationship between the gap and distress. Using two different methods of operationalizing the gap between mothers and their children, the current study addressed this tension in the literature by testing the following hypotheses in a sample of Korean American families. It was hypothesized that mother–adolescent discrepancies in acculturation and enculturation levels would be associated with youth internalizing and externalizing symptoms and that parent–adolescent communication would moderate the gap–distress relationship. Multi-informant questionnaires were administered to 77 Korean American mother–adolescent dyads from the Midwest. Surprisingly, results indicated that consonance in low levels of mother–adolescent enculturation was associated with the highest levels of externalizing symptoms (interaction term method). Adolescents’ perception of communication with their fathers significantly moderated the relationship between the enculturation gap and internalizing symptoms, such that in dyads with a greater enculturation gap, less perceived open communication with fathers was associated with more internalizing symptoms (difference score method). Clinically, the findings indicate a potential target (i.e., parent–adolescent communication) for treatment programs that aim to improve family relations and youth adjustment in immigrant families.  相似文献   
960.
In this study we explore the patent ownership for the innovations created by Canadian nanotechnology inventors. We find that although there is a great innovative potential and inventive productivity among Canadian researchers, a lot of the intellectual property actually leaves the country: Around 50% of the nanotechnology patents invented by Canadian inventors are owned by foreign assignees. We also note the predominance of private companies among the patent owners. Almost one-third of all the Canadian-invented nanotechnology patents is assigned to a single American firm, Xerox Corporation. Furthermore, we explore the role of Canadian nanotechnology star inventors. The results show that the fruits of their great inventive productivity are collected outside Canada.  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