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   15151篇
  免费   214篇
各国政治   550篇
工人农民   1244篇
世界政治   712篇
外交国际关系   534篇
法律   8731篇
中国政治   39篇
政治理论   3488篇
综合类   67篇
  2020年   79篇
  2019年   109篇
  2018年   1394篇
  2017年   1323篇
  2016年   1153篇
  2015年   170篇
  2014年   131篇
  2013年   783篇
  2012年   331篇
  2011年   1060篇
  2010年   1146篇
  2009年   727篇
  2008年   890篇
  2007年   841篇
  2006年   185篇
  2005年   218篇
  2004年   324篇
  2003年   314篇
  2002年   181篇
  2001年   229篇
  2000年   199篇
  1999年   172篇
  1998年   110篇
  1997年   105篇
  1996年   94篇
  1995年   108篇
  1994年   99篇
  1993年   88篇
  1992年   123篇
  1991年   162篇
  1990年   135篇
  1989年   156篇
  1988年   133篇
  1987年   163篇
  1986年   146篇
  1985年   151篇
  1984年   143篇
  1983年   149篇
  1982年   110篇
  1981年   101篇
  1980年   92篇
  1979年   103篇
  1978年   87篇
  1977年   71篇
  1976年   73篇
  1975年   62篇
  1974年   70篇
  1973年   68篇
  1972年   57篇
  1969年   57篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
931.
932.
The practice of criminal psychological profiling is frequently cited as being applicable to serial arson crimes. Despite this claim, there does not appear to be any empirical research that examines serial arson offence behaviors in the context of profiling. This study seeks to develop an empirical model of serial arsonist behaviors that can be systematically associated with probable offender characteristics. Analysis has produced a model of offence behaviors that identify four discrete behavior patterns, all of which share a constellation of common nondiscriminatory behaviors. The inherent behavioral themes of each of these patterns are explored with discussion of their broader implications for our understanding of serial arson and directions for future research.  相似文献   
933.
934.
Time-of-flight mass spectrometry (TOF-MS) offers new perspectives for forensic toxicology. Qualitative and quantitative analyses of a mixture of three selected benzodiazepines (diazepam, nordazepam and bromazepam) were used to compare gas chromatography (GC-TOF-MS, quadrupole GC-MS, GC-ECD) and liquid chromatography (HPLC-DAD) data. Method validation parameters like LOD, LOQ, S/N-ratios reflect the capabilities of GC-TOF-MS. Five-point calibrations for bromazepam in human peripheral blood (50, 100, 160, 200, 300 ng/ml) using medazepam as internal standard (1000 ng/ml) were performed. The calibrations using GC-TOF-MS (using the fragments of m/z 236 and 288), GC-ECD (dual system) and HPLC-DAD (at 235 nm) all showed correlation coefficients close or superior to 0.99. Quadrupole GC-MS data was not used in the comparison of extracted samples due to the low sensitivity in the full scan mode. Two analyses of real cases concerning bromazepam are presented. In the first case, the presence or absence of bromazepam could not be established with both HPLC-DAD and GC-ECD due to background signals. The extracted ion chromatograms and spectrum traces after the analysis with the GC-TOF-MS could clearly excluded the presence of bromazepam. The second case illustrates the quantitation of bromazepam, where both HPLC-DAD and GC-ECD were unable to give satisfactory results, again due to interfering background signals. The analyses performed on the GC-TOF-MS-system demonstrated high sensitivity and also high selectivity due to the high quality of mass spectra obtained. The advantages of GC-TOF-MS make it a promising analytical technique for forensic toxicology.  相似文献   
935.
936.
The international order is becoming increasingly precarious as a result of the pressures of globalisation and inadequate policy responses by many states, most importantly the United States, which still holds a pivotal role in building and sustaining international order. The present state of affairs in global governance is characterised by 1) an overwhelming concentration of power at the level of interstate relations but 2) a diffusion of power if we look at the totality of international relations, 3) the erosion of state authority and political legitimacy, 4) the growing importance of markets and of 5) fundamentalist ideologies, 6) the declining utility and the paradoxical impact of force on political order, and 7) by the still indispensable but increasingly fragile base of international order in functioning statehood at the national level. Overall, this situation reflects a mismatch between political demands on and the actual supply of international order whose present state leaves much to be desired. By way of conclusion, the article offers some policy recommendations about how to change the present precarious situation.  相似文献   
937.
938.
This paper summarizes empirical findings and results from the author's most recent research publication in Chinese: China's Unbalanced Economic Growth. It studies China's economic growth with a special emphasis on its regional disparities. It provides an analysis of China's overall economic landscape as well as an empirical study of China's unbalanced regional development. Based on its quantitative findings and results, the author predicts the emergence of ten Chinese metropolitan economies in the early twenty-first century and recommends a regional development strategy as well as implementation policies for China's future development. The major empirical findings, results and conclusions of this research are outlined in three sections: the first describes China's economic future—the emergence of ten regional metropolitan economies, the second reports the empirical findings of China's national and regional economic disparities and discusses policy implications, and the third investigates China's future economic growth and discusses its growth limitations.  相似文献   
939.
China's rapidly growing motor vehicle fleet is changing the makeup of its urban atmosphere. While the two major problem pollutants historically have been particulates and sulfur dioxide, the growth in the number of automobiles has generated substantially increased levels of nitrogen dioxide (NO2). This paper examines and values the mortality health effects (reduced premature deaths) from cleaning up these three pollutants. Findings indicate that valued gains from reduced air pollution mortality can average 3% of a city's GDP. Moreover, the growing auto fleet may generate a ten-fold increase in NO2-based mortality costs and offset other, ongoing cleanup efforts in many Chinese cities. Specifically, the paper explores how the increasing number of automobiles might diminish or offset environmental cleanup activities focused upon particulate and sulfur dioxide pollution.  相似文献   
940.
Many tout the benefits of collaborative environmental management as an alternative to centralized planning and command and control regulation, but the excitement over collaborative processes has not been matched by evidence that these processes actually improve the environment. The most crucial question in collaborative environmental management remains unanswered and often unasked: To what extent does collaboration lead to improved environmental outcomes? We know much about why collaboration is occurring and how collaborative processes and outputs vary. The primary goal of future research on collaborative environmental management should be to demonstrate whether collaboration improves environmental conditions more than traditional processes and newer market-based processes. Collaboration is not a panacea; it is a choice that policy makers and public managers should make based on evidence about expected outcomes.  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