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   92篇
  免费   4篇
各国政治   9篇
工人农民   12篇
世界政治   10篇
外交国际关系   9篇
法律   46篇
中国政治   2篇
政治理论   8篇
  2021年   1篇
  2020年   2篇
  2019年   7篇
  2018年   4篇
  2017年   4篇
  2016年   5篇
  2015年   3篇
  2014年   5篇
  2013年   11篇
  2012年   7篇
  2011年   2篇
  2010年   3篇
  2009年   6篇
  2008年   7篇
  2007年   5篇
  2005年   4篇
  2003年   3篇
  2002年   2篇
  2001年   2篇
  1998年   2篇
  1997年   2篇
  1993年   2篇
  1990年   1篇
  1989年   1篇
  1987年   1篇
  1986年   1篇
  1979年   1篇
  1976年   1篇
  1971年   1篇
排序方式: 共有96条查询结果,搜索用时 15 毫秒
31.
This article argues that accounts of the Russian media system that tend to view the time from Vladimir Putin’s rise to power in 2000 as a single homogenous period do not capture major qualitative shifts in state-controlled media coverage. By analyzing the output of Russia’s two main television channels during Putin’s third presidential term, we identify a range of distinctly new features that amount to a new media strategy. This involves a significant increase in the coverage of political issues through the replacement of infotainment with what we term agitainment—an ideologically inflected content that, through adapting global media formats to local needs, attempts to appeal to less engaged and even sceptical viewers. Despite the tightening of political control over the media following the annexation of Crimea, the new strategy paradoxically has strengthened the constitutive role played by the state-controlled broadcasters in the articulation of official discourse.  相似文献   
32.
In 1917, the United States was far from a cohesive entity. Using the events surrounding World War One as a natural laboratory to trace the construction of a unified American identity, this article adds to the debate on the political sociology of identity frames and nationalism. Using an event-frame - model to analyze the discourse reflected in pamphlets disseminated by the Wilson administration, I demonstrate how identity frames evolved and increasingly relied on enemy images to strengthen the in-group coherence of American citizens. Thus, paying attention to the political dynamics of frame evolution is crucial in understanding the emergence of salient identities.  相似文献   
33.
Transnational adoption and child migration are often regarded as recent phenomena, yet there is a long history of children travelling without their families, settling and integrating in a foreign culture and environment. In the 1920s, thousands of Hungarian children went to Belgium for a six-month holiday within the framework of a humanitarian project. Although they were supposed to return to Hungary after their vacation, some of them stayed indefinitely with their Belgian families. By analyzing oral testimonies of the now elderly ‘children’ about their migration and childhood experiences in Belgium, we explore how they construct and reconstruct concepts such as childhood, vulnerability, and loyalty commitments, and show the crucial importance of maintaining birth family ties for the future development of transnationally adopted children.  相似文献   
34.
The determination of the age of an ink entry from a questioned document is often an essential problem and a controversial issue in forensic sciences. Therefore, it is important to understand the aging process of the different components found in ink. The aim of this work was to study the drying process of ballpoint ink, characterised by the disappearance of volatile solvents from the ink entry. Phenoxyethanol is of particularly high interest as it is found in more than 80% of the blue ballpoint pens at different concentrations. Liquid extraction followed by splitless gas chromatography/mass spectrometry in the selected ion mode was used to measure the quantitative decrease of solvents from ink entries made with a blue Parker ballpoint pen. Quantities of ethoxyethoxyethanol, dipropylene glycol, phenoxyethanol and phenoxyethoxyethanol were studied in ink entries up to 1.5 years old, thus allowing to calculate aging curves for this particular pen. The low quantities of solvents (in the microgram range for a 1 cm ballpoint entry) were found to decrease quickly after deposition of the ink on paper through the competitive processes of evaporation and diffusion. Losses of up to 75% of solvents were observed after a few seconds. The amount of ethoxyethanol stopped decreasing after about 10 days (quantities reached the nanogram range for a 1 cm ballpoint entry), while the aging curves of dipropylene glycol, phenoxyethanol and phenoxyethoxyethanol level off considerably after 2 weeks. It was observed that ethoxyethanol, dipropylene glycol and phenoxyethanol can also migrate from one sheet of paper to another if placed close enough (e.g. in a book or a stack of papers), therefore contamination from fresh ink strokes from other paper sheets has to be taken into account for those solvents. In this paper we demonstrate that differentiation between fresh ink (<2 weeks) and older inks is possible under laboratory storage conditions. For real cases samples, more parameters have to be studied and other possible pathways have to be considered.  相似文献   
35.
Fentanyl is a potent synthetic narcotic analgesic administered in the form of a transdermal patch for the management of chronic pain. A 78-year-old woman with a history of cancer was found dead in bed. She was lying on her back. The external examination revealed 10 Durogesic transdermal therapeutic systems (100 microg/h fentanyl) on the body. Liquid-liquid extraction and liquid chromatography tandem mass spectrometry with electrospray source in positive ionization mode was applied for the quantitation of fentanyl and its major metabolite norfentanyl in the post-mortem samples. Fentanyl-d5 and norfentanyl-d5 were used as internal standards. Multiple reaction monitoring was used for specific detection. Calibration was performed by addition of standard solutions to drug-free matrix (blood, urine and liver) prior to extraction. The method showed good linearity for fentanyl and norfentanyl over a concentration range of 5-150 microg/L in reconstituted extracts with coefficients of determination equal or greater than 0.998. Percent mean within-day precision and accuracy of 0.9-1.0% and 99.4-101.1% for fentanyl and 2.0-4.5% and 93.1-101.0% for norfentanyl were obtained. Mean extraction recoveries varied between 95.5% and 100.3% for fentanyl and 39.2-57.4% for norfentanyl. The following fentanyl (norfentanyl) concentration in the post-mortem samples were measured; 28.6 microg/L (3.0 microg/L) in right and 28.2 microg/L (3.5 microg/L) in left subclavian blood, 21.3 microg/L (<2 microg/L) in right and 20.9 microg/L (<2 microg/L) in left femoral blood, 37.6 microg/L (4.2 microg/L) in right and 33.9 microg/L (4.4 microg/L) in left ventricular blood, 282.9 microg/L (121.2 microg/L) in urine, 688.2 microg/L in stomach contents, 122.5 microg/L (25.4 microg/L) in bile, 19.5 microg/L (< 2 microg/L) in vitreous humour, 203.0 microg/kg (26.6 microg/kg) in liver and 78.6 microg/kg (46.3 microg/kg) in kidney. We concluded that the woman's death was caused by acute intoxication with fentanyl. The manner of death was presumed to be suicide due to excessive administered Durogesic transdermal therapeutic systems.  相似文献   
36.
e-mail: tpluem{at}essex.ac.uk (corresponding author) This paper suggests a three-stage procedure for the estimationof time-invariant and rarely changing variables in panel datamodels with unit effects. The first stage of the proposed estimatorruns a fixed-effects model to obtain the unit effects, the secondstage breaks down the unit effects into a part explained bythe time-invariant and/or rarely changing variables and an errorterm, and the third stage reestimates the first stage by pooledOLS (with or without autocorrelation correction and with orwithout panel-corrected SEs) including the time-invariant variablesplus the error term of stage 2, which then accounts for theunexplained part of the unit effects. We use Monte Carlo simulationsto compare the finite sample properties of our estimator tothe finite sample properties of competing estimators. In doingso, we demonstrate that our proposed technique provides themost reliable estimates under a wide variety of specificationscommon to real world data. Authors' note: Earlier versions of this paper have been presentedat the 21st Polmeth Conference at Stanford University, PaloAlto, July 29–31, 2004, the 2005 MPSA Conference in Chicago,April 7–10, and the APSA Annual Conference 2005 in Washington,September 1–4 2005. We thank the referees of PoliticalAnalysis and Neal Beck, Greg Wawro, Donald Green, Jay Goodliffe,Rodrigo Alfaro, Rob Franzese, Jörg Breitung, and PatrickBrandt for helpful comments on previous drafts. Any remainingdeficiencies are our responsibility.  相似文献   
37.
The introduction of the Euro has considerably affected the de facto monetary policy autonomy—defined as independence from monetary policy in the key currency areas—in countries outside the European Currency Union (ECU). Using a standard open economy framework, we argue that de facto monetary policy autonomy has significantly declined for countries that dominantly trade with the ECU and slightly increased for countries that dominantly trade with the Dollar zone. The predictions of our model find support in the data. We estimate the influence of the Bundesbank's/ECB's and the Fed's monetary policies on various country groups. The de facto monetary policy autonomy of both non-Euro EU members and EFTA countries declined with the introduction of the Euro. This effect was slightly stronger for the EU member countries than for EFTA countries as our theory predicts. At the same time, the de facto monetary policy autonomy of Australia and New Zealand vis-à-vis the US Dollar has (moderately) increased.  相似文献   
38.
39.
This article presents an experimental analysis of the combination of different regions of the human face on various forensic scenarios to generate scientific knowledge useful for the forensic experts. Three scenarios of interest at different distances are considered comparing mugshot and CCTV face images using MORPH and SC face databases. One of the main findings is that inner facial regions combine better in mugshot and close CCTV scenarios and outer facial regions combine better in far CCTV scenarios. This means, that depending of the acquisition distance, the discriminative power of the facial regions change, having in some cases better performance than the full face. This effect can be exploited by considering the fusion of facial regions which results in a very significant improvement of the discriminative performance compared to just using the full face.  相似文献   
40.
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