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   365篇
  免费   16篇
各国政治   32篇
工人农民   2篇
世界政治   41篇
外交国际关系   21篇
法律   186篇
中国政治   2篇
政治理论   93篇
综合类   4篇
  2023年   4篇
  2022年   6篇
  2021年   6篇
  2020年   9篇
  2019年   8篇
  2018年   16篇
  2017年   20篇
  2016年   17篇
  2015年   19篇
  2014年   20篇
  2013年   59篇
  2012年   17篇
  2011年   15篇
  2010年   14篇
  2009年   13篇
  2008年   20篇
  2007年   16篇
  2006年   16篇
  2005年   13篇
  2004年   13篇
  2003年   16篇
  2002年   10篇
  2001年   10篇
  2000年   7篇
  1999年   1篇
  1998年   2篇
  1997年   2篇
  1996年   1篇
  1995年   3篇
  1993年   1篇
  1989年   1篇
  1986年   1篇
  1982年   1篇
  1981年   1篇
  1980年   1篇
  1970年   2篇
排序方式: 共有381条查询结果,搜索用时 15 毫秒
351.
Gunshot injuries in the back may suggest the unjustified use of firearms. A wound in the back inflicted by a firearm should not automatically imply that the shooter aimed at the back. A previous study demonstrated that it is possible for men to turn their trunk faster than it takes for a shooter to fire or throw a hand-operated weapon. With a high speed motion camera the authors were able to demonstrate that it is also possible for women to turn their trunk fast enough, so that a shot in the back could have been aimed at the front of the body. This conclusion is also likely to apply to hand-operated or thrown weapons, since the velocity of their projectiles is considerably lower than that of firearms.  相似文献   
352.
Rapid prototyping (RP) comprises a variety of automated manufacturing techniques such as selective laser sintering (SLS), stereolithography, and three-dimensional printing (3DP), which use virtual 3D data sets to fabricate solid forms in a layer-by-layer technique. Despite a growing demand for (virtual) reconstruction models in daily forensic casework, maceration of the skull is frequently assigned to ensure haptic evidence presentation in the courtroom. Owing to the progress in the field of forensic radiology, 3D data sets of relevant cases are usually available to the forensic expert. Here, we present a first application of RP in forensic medicine using computed tomography scans for the fabrication of an SLS skull model in a case of fatal hammer impacts to the head. The report is intended to show that this method fully respects the dignity of the deceased and is consistent with medical ethics but nevertheless provides an excellent 3D impression of anatomical structures and injuries.  相似文献   
353.
A common argument in the trust literature is that high-trust cultures allow efficient commercial contracts to be shorter, covering fewer contingencies. We take this idea to the topic of social contracts. Specifically, we ask whether social trust affects the length and detail of constitutions. Cross-country estimates suggest that national trust levels are indeed robustly and negatively associated with the length of countries’ constitutions.  相似文献   
354.
The 'herbal highs' market continues to boom. The added synthetic cannabinoids are often exchanged for another one with a high frequency to stay at least one step ahead of legal restrictions. While most of these substances were synthesized for pharmaceutical purposes and have been described in the scientific literature before, others originate from clandestine laboratories supplying this lucrative market. In this paper, the identification and structure elucidation of two synthetic cannabinoids is reported. The first compound, 1-[(5-fluoropentyl)-1H-indol-3yl]-(4-methylnaphthalen-1-yl)methanone, was found along with AM-2201 in a 'herbal mixture' obtained via the Internet. For isolation of the substance from the mixture, a newly developed flash chromatography method was used providing an inexpensive and fast way to gain pure reference substances from 'Spice' products for the timely development or enhancement of analytical methods in the forensic field. The second substance, 4-fluoronaphthalen-1-yl-(1-pentylindol-3-yl)methanone (JWH-412) was seized by German authorities as microcrystalline powder, making it very likely that it will be found in 'herbal mixtures' soon.  相似文献   
355.
We examine whether scientists employed in foreign countries and foreign-educated native researchers are more “entrepreneurial” than their “domestic” counterparts. We conjecture that foreign-born and foreign-educated scientists possess broader scientific skills and social capital, which increases their likelihood that they will start their own companies. To test this hypothesis we analyze comprehensive data from researchers at the Max Planck Society in Germany. Our findings provide strong support for the conjecture that academic entrepreneurship can be stimulated by facilitating the mobility of scientists across countries.  相似文献   
356.
Reaching a high conformity of reported data for different offence groups with the standard definitions provided for these offences is a crucial issue in order to improve comparability of crime and criminal justice data from official sources between countries. Based on data and metadata collected for the European Sourcebook of Crime and Criminal Justice Statistics (ESB), this article takes a close look at the offence definitions used in the 4th edition Sourcebook. After an overview on ESB methodology, namely on questionnaire design and data validation procedures, the general structure of offence definitions in the ESB context is shown and changes compared to earlier editions are explained. Afterwards, ESB data and definition metadata are used to check the quality of the definitions used. Overall and item conformity rates for each offence definition are calculated and assessed. Missing data rates as another indicator for quality problems of definitions are also evaluated. Then, variation coefficients for the different offence groups are compared and critically assessed. The final part of the article contains a view on the distribution of conformity with definitions across Europe. Altogether, offence definitions in the ESB turn out to work very well. Conformity rates tend to be high and variation coefficients are mostly quite uniform for the different offence categories. However, some problematic offence definitions can be identified. As a result of regional analysis it can be shown that conformity rates across Europe do not vary randomly, but follow a certain pattern.  相似文献   
357.
358.
This paper offers an explanation why most democracies arecharacterized by moderate taxation of wealth although thewealth distribution is persistently skewed to the right. Wemodel an economy in which agents have to acquire highereducation to qualify for skilled work and in which capitalmarket imperfections prevent poor individuals from making sucha profitable human capital investment. If these borrowingconstraints do not bind for members of the middle class, theymay rationally reject redistribution although both the currentand the future median of the wealth distribution are below themean.  相似文献   
359.
360.
In den Vereinigten Staaten wie auch in einer Reihe anderer westlicher Industrienationen ist seit einiger Zeit eine radikale Privatisierung und Befestigung von urbanen Lebensr?umen zu verzeichnen. In sogenannten „gated communities“ wird kollektiver und traditionell ?ffentlich genutzter Raum zum interdiktorischen Raum redefiniert. Der breiten ?ffentlichkeit wird der Zutritt zu diesen Territorien mit Hilfe von Z?unen, Mauern und überwachung der Zug?nge durch moderne Sicherheitssysteme bzw. durch Angeh?rige privater Sicherheitsdienste verwehrt. Hauptziel dieser Einrichtungen ist die soziale Exklusion unerwünschter Personen zur Sicherstellung physischer, sozialer und kultureller Integrit?t der Bewohner. Inzwischen existieren in den USA sch?tzungsweise mehr als 20.000 dieser Anlagen, in denen etwa acht Millionen Menschen Zuflucht vor den insbesondere in den Gro?st?dten virulenten sozialen Problemen suchen. Die radikale r?umliche Abschottung hat jedoch gravierende soziale, kulturelle, politische und psychische Konsequenzen. In diesem Beitrag werden Ursachen, Typen und Formen der als „Zitadellen der Sicherheit“ bezeichneten Lebensr?ume sowie Konsequenzen ihrer Proliferation kritisch diskutiert.  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