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   7220篇
  免费   251篇
各国政治   394篇
工人农民   233篇
世界政治   582篇
外交国际关系   284篇
法律   4242篇
中国政治   47篇
政治理论   1616篇
综合类   73篇
  2020年   82篇
  2019年   106篇
  2018年   170篇
  2017年   159篇
  2016年   165篇
  2015年   138篇
  2014年   127篇
  2013年   814篇
  2012年   153篇
  2011年   177篇
  2010年   158篇
  2009年   165篇
  2008年   172篇
  2007年   180篇
  2006年   200篇
  2005年   177篇
  2004年   170篇
  2003年   179篇
  2002年   168篇
  2001年   221篇
  2000年   184篇
  1999年   167篇
  1998年   106篇
  1997年   94篇
  1996年   79篇
  1995年   82篇
  1994年   83篇
  1993年   84篇
  1992年   121篇
  1991年   155篇
  1990年   130篇
  1989年   149篇
  1988年   132篇
  1987年   156篇
  1986年   144篇
  1985年   151篇
  1984年   138篇
  1983年   140篇
  1982年   102篇
  1981年   96篇
  1980年   93篇
  1979年   101篇
  1978年   75篇
  1977年   60篇
  1976年   68篇
  1975年   61篇
  1974年   70篇
  1973年   67篇
  1972年   55篇
  1969年   57篇
排序方式: 共有7471条查询结果,搜索用时 15 毫秒
991.
992.
993.
994.
The Russian military-industrial sector, like the economy generally is undergoing a turbulent transformation. Property rights, institutional arrangements, regulatory mechanisms and procurement demand are in rapid flux. In 1992 weapons production declined drastically, variously estimated between 20 and 67 percent, but arms contracts for 1993 are reported to be double last year's volume. This essay attempts to illuminate key elements of Russia's military-industrial transition by analyzing how property rights, tax and regulatory reforms of the sorts advocated by Alexsandr Isaev and Anatoly Chubais are apt to effect efficiency and military-industrial conversion. It is shown that while collectivist ownership could enhance economic efficiency, despite the usual Ward-Domar effects, Yeltsin's market reforms may not be sufficient to foster large scale military-industrial conversion.  相似文献   
995.
The different statements concerning the slope and intercept of the regression line and the 95% limits of confidence are the reason that potassium in vitreous humor is not used (at least in Germany) as an aid in estimating the time of death. The relationship between the concentration of potassium and the time of death is mainly influenced by antemortem electrolyte imbalances caused by disease and/or duration of terminal episode. The influence of terminal episode is best identified by its duration (Adelson et al., J. Forensic Sci., 8 (1963) 503–514). In order to have a method suitable for every case and to be as precise as possible we looked therefore for parameters in vitreous humor which were stable postmortem and indicating antemortem electrolyte imbalance. Urea is such a parameter, being stable postmortem (Coe, Am. J. Clin. Pathol., 51 (1969) 741–750) and useful as a marker of antemortem electrolyte imbalance. Our investigations on potassium in vitreous humor, including sudden and hospital deaths after chronic lingering disease, revealed 95% limits of confidence of ±34 h up to 120 h postmortem. Reviewing only cases with urea less than 100 mg/dl the 95% limits of confidence could be reduced to ±22 h. Considering the duration of terminal episode (<6 h) the precision was ±20 h. In this way our modified procedure is suitable for every case with the resulting precision of estimation being determined only by the duration of the terminal episode and urea concentration.  相似文献   
996.
997.
This paper compares environmental policymaking in two Brazilian cities, Rio de Janeiro and Cubatão. It examines the formation of state-society synergistic interactions in the public policymaking process and their effect on long term sustainability of social mobilization. It concludes that whereas social capital can be constructed in the context of policymaking, it is critically dependent on a concerted effort from both state and society actors to build trust in their daily interactions. The Cubatão and Carioca River cases show that state-society synergy had little effect on the ability of the policy coalitions formed for pollution clean up to sustain themselves over time. Instead, there are indications that rather than a constraint, the flexible and informal nature of such coalitions may have been a critical factor in their ability to carry out policy successfully.  相似文献   
998.
999.
1000.
The specificity of antisera raised against each of the prostaglandin series 190H E1/E2 and 190H F1 alpha/F2 alpha, produced in males, was evaluated by radioimmunoassay. Further, the ability of these antisera to detect semen specific prostaglandins in mixtures of body fluids was examined. Antisera directed against the 190H E1/E2 series cross-reacted with prostaglandin E1 and marginally with E2. Antisera raised to the 190H F1 alpha/F2 alpha series were, however, highly specific to the semen specific prostaglandins 190H F1 alpha/F2 alpha and 190H E1/E2. It was possible to detect picogramme quantities of contaminating 190H F1 alpha/F2 alpha on vaginal swabs taken up to 72 h after intercourse and on vaginal swabs stored at room temperature for up to 2 years. These prostaglandins were not detected on semen free vaginal swabs, in faecal material, saliva, urine or in a sample of human milk (stain). A limited study of casework material is also described. Detection of the 190H F series, as a group, has considerable potential in the identification of human semen at picogramme levels, eliminating the need for alternative chemical tests and extensive microscopic examination.  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