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   1055篇
  免费   49篇
各国政治   55篇
工人农民   28篇
世界政治   91篇
外交国际关系   78篇
法律   609篇
中国共产党   2篇
中国政治   11篇
政治理论   192篇
综合类   38篇
  2023年   11篇
  2022年   11篇
  2021年   11篇
  2020年   34篇
  2019年   32篇
  2018年   35篇
  2017年   42篇
  2016年   48篇
  2015年   32篇
  2014年   45篇
  2013年   150篇
  2012年   51篇
  2011年   41篇
  2010年   43篇
  2009年   39篇
  2008年   49篇
  2007年   34篇
  2006年   36篇
  2005年   49篇
  2004年   45篇
  2003年   39篇
  2002年   28篇
  2001年   32篇
  2000年   29篇
  1999年   13篇
  1998年   21篇
  1997年   6篇
  1996年   7篇
  1995年   11篇
  1994年   10篇
  1993年   4篇
  1992年   2篇
  1991年   3篇
  1990年   5篇
  1989年   7篇
  1988年   7篇
  1987年   2篇
  1986年   9篇
  1983年   6篇
  1982年   3篇
  1979年   1篇
  1978年   2篇
  1977年   1篇
  1976年   2篇
  1974年   4篇
  1973年   1篇
  1972年   2篇
  1969年   1篇
  1967年   4篇
  1963年   1篇
排序方式: 共有1104条查询结果,搜索用时 15 毫秒
191.
美国在形成一个中亚安全战略规划,在地理上以阿富汗为中心,涵盖中亚南亚,在主题上以区域一体为目标,这被称为"新丝绸之路愿景规划"。它以经济为重点,在贸易领域,推动实施美国—中亚《贸易投资框架协定》,重点发展大中亚区域贸易,帮助中亚国家相互降低贸易壁垒,推动中亚国家、阿富汗相邻区域整合;在能源领域,与中亚国家、拉脱维亚、俄罗斯等国建立北部运输网络,形成由公路、铁路、天然气管道以及电力传输线路构成的大中亚交通网络,繁荣区域贸易与经济;在反恐领域,加强与中亚国家安全领域的合作关系,确保驻阿富汗美军的交通线;同时,推动多边安全体制,在中亚实施巴尔干方案,加强对中亚国家的经济援助,促进中亚各国内部间的合作,实现该地区的持久和平。  相似文献   
192.
The concepts of "density" and "urban morphology" are today at the centre of debates on architecture and urban planning. The concept of"density" provides a solution to the issue of urban sprawl and, consequently, offers a way of rethinking sustainable urban and rural development. The densification of urban centres makes it possible to reduce a vulnerability related to the excessive use of suburban areas. However, densification is not a "turnkey" solution. Numerous criteria relating to its use are poorly understood. As numerous contemporary experiences have demonstrated, urban densification exposes space systems to new, unknown forms of vulnerability. First, the concept of "vulnerability" will be defined, specifically that of urban vulnerability, as well as related concepts, such as those of risk, hazard, and challenges. Secondly, forms of vulnerability inherent in the over-densification paradigm are pinpointed: This will involve determining the specific hazards, challenges, and risks of this space system. Thirdly, the authors will demonstrate how the concept of "compactness" makes it possible to review at the different urban levels the densification processes of territories and urban areas. Finally, a tool for the optimisation of compact urban morphologies for use in countering the related hazards and risks will be proposed.  相似文献   
193.
The regulation of intellectual property rights takes place in a range of international venues. This proliferation of international venues greatly enhances the potential for venue shopping. We argue that different levels of domestic regulation and differing degrees of judicialization account for actors' preferences over institutional venues. We take into consideration two scenarios. Conceiving of judicialization as the delegation of adjudication to an independent third party and the enforcement through multilaterally authorized sanctions, we show that: (i) upward regulatory harmonization leads actors preferring weak regulatory intellectual property rights standards to strive for venues with low degrees of judicialization, whereas those favoring stringent intellectual property rights protection prefer highly judicialized venues; and (ii) downward harmonization leads to the opposite constellation of institutional preferences. We show how these expectations hold by way of in‐depth case studies of two instances of global intellectual property rights regulation: the regulation of plant genetic resources and intellectual property rights for medicines.  相似文献   
194.
The possibility of detection of lead-antimony-barium aggregates from non-firearm sources is confirmed according to the tests performed on brake pads, and firework and automobile workers. Moreover, information on particles taken from cartridge cases shows the relative feeble importance of the morphology in distinguishing gunshot residues (GSRs). Furthermore, also the presence in the spectrum of other elements (e.g., iron) is not so conclusive. In this panorama, the possibility of discriminating gunshot residue particles from other non-firearm lead-antimony-barium aggregates is investigated: the proposed method is based on X-ray mapping technique--currently applied used in Reparto Carabinieri Investigazioni Scientifiche in Rome, the forensic service of Italian Carabinieri--according to which the spatial distribution of the emission energy of each element of the sample is pictured. Gunshot residues present the same lead-antimony-barium distribution (or at least the same antimony-barium distribution with lead nodules), as some other environmental occupational aggregates do not (different plaques of lead, antimony, and barium). So, X-ray mapping technique can offer a new fundamental evaluation parameter in analysis of gunshot residues with scanning electron microscopy/energy-dispersive (SEM/EDS) spectrometry, and new standards could be considered.  相似文献   
195.
196.
197.
We present an uncommon case of sudden cardiac death in a 34-year-old white woman. She was found lifeless at home by her parents. Three months before death she was recovered at the Emergency Room for chest pain, palpitation and loss of consciousness. Subsequent cardiological evaluation with ECG showed sinusal rhythm, QRS deviation to the left, QS aspect, asymmetric and rounded T waves and slight length of QT. During hospitalization she presented some episodes of supraventricular paroxysmal tachycardia and non-sustained ventricular tachycardia. No echocardiography alterations were found. An anti-arrhythmic treatment was prescribed. Autopsy revealed some fibrotic scarring in the myocardium of left ventricle. The histological examination of the heart revealed diffuse and extensive fibrosis with non-caseating sarcoid granulomas. The lungs, kidneys and lymph node also showed the same non-caseating granulomas. The diagnosis of sarcoidosis with massive and extensive cardiac involvement was established as cause of death.  相似文献   
198.
We examine the Laffer effects of the policy of social security tax reduction cum partial deregulation of labour market undertaken in Italy in the period 1997–2001. Laffer effects of tax cut are generally delayed and governments responsible of the reform cannot benefit from the resulting increased revenues when in office. Our empirical findings show that tax cuts combined with policies of liberalization determine almost immediate Laffer effects. In terms of coherent supply-side political programs, the effects of the two measures are not separable. Reflection on our results may broaden the scope of the supply-side policies of deregulation and detaxation.
Francesco ForteEmail:
  相似文献   
199.
In most Western European countries, including Belgium, judicial alternative sanctions are increasingly being used for drug users. Because no study into the effectiveness of Belgian judicial alternatives for drug users has yet been carried out, this became the objective of the current research. The design of this study comprises a pre and post measurement of the criminal activity, drug use and situation in different spheres of life of 565 drug-dependent offenders. Two conclusions can be drawn. First, after an alternative sanction or measure is imposed, there is a reduction in the criminal activity of the offender. Second, this crime reduction goes hand in hand with a progress in several relevant life spheres.  相似文献   
200.
We report three cases of tri-allelic patterns observed during routine forensic casework on 5964 Belgian residents. These individuals had been typed for the following 15 autosomal STRs: CSF1PO, D3S1358, D5S818, D7S820, D8S1179, D13S317, D16S539, D18S51, D21S11, vWA, FGA, TH01, TPOX, D2S1338 and D19S433.The first example of a tri-allelic pattern had the genotype 13;15;16 for the D8S1179 locus. In the second observation there was 16;21;22 pattern for the D18S51 locus. The third case had the alleles 10;11;13 also for D18S51.All cases belonged to the Type I tri-allelic pattern, with three uneven peaks, the sum of the heights of both smaller peaks equalling the height of the tallest peak.Three cases in 5964 typed individuals is a frequency for tri-allelic patterns in autosomal STRs of 0.05%.  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