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   1384篇
  免费   76篇
各国政治   80篇
工人农民   63篇
世界政治   99篇
外交国际关系   112篇
法律   757篇
中国政治   10篇
政治理论   328篇
综合类   11篇
  2023年   18篇
  2022年   19篇
  2021年   16篇
  2020年   40篇
  2019年   49篇
  2018年   52篇
  2017年   65篇
  2016年   67篇
  2015年   39篇
  2014年   57篇
  2013年   190篇
  2012年   60篇
  2011年   45篇
  2010年   45篇
  2009年   44篇
  2008年   51篇
  2007年   66篇
  2006年   49篇
  2005年   58篇
  2004年   42篇
  2003年   38篇
  2002年   48篇
  2001年   19篇
  2000年   20篇
  1999年   25篇
  1998年   13篇
  1997年   9篇
  1996年   8篇
  1995年   16篇
  1994年   13篇
  1993年   4篇
  1992年   23篇
  1991年   8篇
  1990年   6篇
  1989年   13篇
  1988年   13篇
  1987年   8篇
  1986年   8篇
  1985年   10篇
  1983年   11篇
  1982年   10篇
  1981年   4篇
  1980年   7篇
  1977年   7篇
  1975年   4篇
  1974年   4篇
  1973年   6篇
  1969年   5篇
  1968年   3篇
  1966年   4篇
排序方式: 共有1460条查询结果,搜索用时 15 毫秒
211.
Increasing politicization in EU member states about European issues can be expected to strengthen the impact of attitudes towards Europe on vote choice in European Parliament (EP) elections. At the same time this impact is likely to vary between voters and contexts as a function of political information. This study explores the role of political information in explaining individual and contextual heterogeneity in the degree of EU issue voting. Using a two-step hierarchical estimation procedure to explore both individual and contextual variation, we show that while EU issue voting in the 2009 EP elections is only slightly more pronounced among the politically sophisticated, it is clearly more extensive in contexts that provide higher levels of political information on European matters.  相似文献   
212.
213.
Forensic laboratories do not have the infrastructure to process or store contaminated DNA samples that have been recovered from a crime scene contaminated with chemical or biological warfare agents. Previous research has shown that DNA profiles can be recovered from blood exposed to several chemical warfare agents after the agent has been removed. The fate of four toxic agents, sulfur mustard, sodium 2-fluoroacetate, sarin, and diazinon, in a lysis buffer used in Promega DNA IQ extraction protocol was studied to determine if extraction would render the samples safe. Two independent analytical methods were used per agent, selected from GC-MS, 1H NMR, 19F NMR, (31)P NMR, or LC-ES MS. The methods were validated before use. Determinations were carried out in a semi-quantitative way, by direct comparison to standards. Agent levels in the elution buffer were found to be below the detectable limits for mustard, sarin, sodium 2-fluoroacetate or low (<0.02 mg/mL) for diazinon. Therefore, once extracted these DNA samples could be safely processed in a forensic laboratory.  相似文献   
214.
Reparations for victims of gross human rights violations arebecoming an increasingly acknowledged feature in post-authoritarianand post-conflict societies coping with the legacy of a violentpast. Despite some recent progress much more work needs to bedone for massive reparations programs to respond better to theneeds of women. This article, resting as it does on a comprehensiveconception of reparations, outlines both the procedural andsubstantive components of reparations programs necessary forthe programs to fulfill the goal of providing (partial) justiceto women.  相似文献   
215.
We investigated ventilatory and metabolic demands in healthy adults when placed in the prone maximal restraint position (PMRP), i.e., hogtie restraint. Maximal voluntary ventilation (MVV) was measured in seated subjects (n=30), in the PMRP, and when prone with up to 90.1 or 102.3 kg of weight on the back. MVV with the heaviest weight was 70% of the seated MVV (122+/-28 and 156+/-38 L/min, respectively; p<0.001). Also, subjects (n=27) were placed in the PMRP and struggled vigorously for 60 sec. During the restrained struggle, ventilatory function (V(E)/ MVV) was 44% of MVV in the resting PMRP. While prone with up to 90.1 or 102.3 kg on the back, the decrease in MVV was of no clinical importance in these subjects. Also, while maximally struggling in the PMRP, V(E) was still adequate to supply the ventilatory needs.  相似文献   
216.
The objective was to investigate color change and surface damage in dental resin composites exposed to high temperatures over different time intervals for comparative purposes. Samples were prepared using two resins - Z100(R) (R1) and Charisma (R2), heated at the following temperatures: 200 degrees C, 400 degrees C, 600 degrees C, 1000 degrees C, for 15, 30 and 45 min (n = 104 for each resin sample). Color (DeltaE) and brightness (DeltaL) changes were analyzed by spectrophotometry using the CIE Lab system and surface changes by Scanning Electron Microscopy (SEM). R1 showed more intense color changes after heat exposure than R2. DeltaL values were found to be the best parameter for evaluation of light and color change. A biphasic pattern after thermal exposure was detected, from dark brown to light white. SEM showed more intense alterations in R2 than in R1. These results indicate that the parameters observed in both resins are useful as a guide in forensic analyses.  相似文献   
217.
Abstract: A procedure for automated bullet signature identification is described based on topography measurements using confocal microscopy and correlation calculation. Automated search and retrieval systems are widely used for comparison of firearms evidence. In this study, 48 bullets fired from six different barrel manufacturers are classified into different groups based on the width class characteristic for each land engraved area of the bullets. Then the cross‐correlation function is applied both for automatic selection of the effective correlation area, and for the extraction of a 2D bullet profile signature. Based on the cross‐correlation maximum values, a list of top ranking candidates against a ballistics signature database of bullets fired from the same model firearm is developed. The correlation results show a 9.3% higher accuracy rate compared with a currently used commercial system based on optical reflection. This suggests that correlation results can be improved using the sequence of methods described here.  相似文献   
218.
Archaeological remains can provide concrete cases, making it possible to develop, refine or validate medico-legal techniques.In the case of the so-called ‘Joan of Arc's relics’ (a group of bone and archaeological remains known as the ‘Bottle of Chinon’), 14 specialists analysed the samples such as a cadaver X of carbonised aspect: forensic anthropologist, medical examiners, pathologists, geneticists, radiologist, biochemists, palynologists, zoologist and archaeologist. Materials, methods and results of this study are presented here.This study aims to offer an exploitable methodology for the modern medico-legal cases of small quantities of human bones of carbonised aspect.  相似文献   
219.
Criminal behavior of parents substantially affects the criminal behavior of children. Little is known, however, about how crime is transmitted from one generation to the next. In order to test two possible explanations against each other, we pose the question whether the timing of the criminal acts of fathers is important for children’s chances of committing crime. Static theories predict that it is the number of delinquent acts performed by fathers that is important, and that the particular timing does not affect the child’s chance of committing crime. Dynamic theories state that the timing is important, and children have a greater chance of committing crime in the period after fathers have committed delinquent acts. Results show that the total number of convictions of a father is indeed very important, but also the exact timing is key to understanding intergenerational transmission of crime. In the year a father is convicted the chance his child is also convicted increases substantially and it decays in subsequent years. This decay takes longer the more crimes father has committed. Our results show that some of the assumptions of the static theories at least need to be adjusted.  相似文献   
220.
The anti-corruption activity of the 1990s is characterized by the rise of new players, such as specialized anti-corruption bodies. Anti-corruption agencies (ACAs) are public bodies of a durable nature, with a specific mission to fight corruption and reducing the opportunity structures propitious for its occurrence in society through preventive and/or repressive measures. Independently of their format and powers, ACAs encounter various constraints to their mandate, which explains the meagre results obtained by some of them. This introductory paper tries to understand the rise, future, and implications of this new kind of “integrity warrior” and to locate them in the evolving doctrine of corruption control. The objective of this edited volume is to re-launch the debate on ACAs as the most innovative feature of the anti-corruption movement of the last two decades.  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