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   789篇
  免费   63篇
各国政治   16篇
工人农民   25篇
世界政治   30篇
外交国际关系   53篇
法律   451篇
中国共产党   5篇
中国政治   66篇
政治理论   95篇
综合类   111篇
  2024年   2篇
  2023年   23篇
  2022年   28篇
  2021年   46篇
  2020年   51篇
  2019年   28篇
  2018年   60篇
  2017年   37篇
  2016年   31篇
  2015年   29篇
  2014年   69篇
  2013年   80篇
  2012年   63篇
  2011年   27篇
  2010年   29篇
  2009年   27篇
  2008年   47篇
  2007年   35篇
  2006年   23篇
  2005年   26篇
  2004年   15篇
  2003年   18篇
  2002年   15篇
  2001年   11篇
  2000年   7篇
  1999年   5篇
  1998年   2篇
  1997年   2篇
  1996年   1篇
  1995年   1篇
  1994年   2篇
  1993年   1篇
  1992年   1篇
  1991年   1篇
  1990年   1篇
  1987年   2篇
  1986年   1篇
  1985年   2篇
  1983年   3篇
排序方式: 共有852条查询结果,搜索用时 15 毫秒
131.
Genotype and allele frequencies for STR loci D3S1358, vWA, FGA, D8S1179, D21S11, D18S51, D5S818, D13S317, D7S820 were investigated in 289 unrelated Italian Caucasian individuals from the North and South regions. After co-amplification by polymerase chain reaction, automatic DNA profiling of these nine STR loci was performed by ABI PRISM((R)) 310 DNA Genetic Analyzer. For each locus, statistical parameters for forensic and paternity purposes were then calculated; the combined power of discrimination and the combined power of exclusion of all nine loci were 0.9999999999917 and 0.99992 for the Northern population and 0.9999999999921 and 0.99991 for the Southern population.  相似文献   
132.
Allele frequencies for the 15 tetranucleotide short tandem repeat loci contained in the AmpFlSTR Identifiler kit were obtained from a population sample of 219 unrelated individuals born in the western part of Romania.  相似文献   
133.
Abstract: Likelihood ratios (LRs) provide a natural way of computing the value of evidence under competing propositions. We propose LR models for classification and comparison that extend the ideas of Aitken, Zadora, and Lucy and Aitken and Lucy to include consideration of zeros. Instead of substituting zeros by a small value, we view the presence of zeros as informative and model it using Bernoulli distributions. The proposed models are used for evaluation of forensic glass (comparison and classification problem) and paint data (comparison problem). Two hundred and sixty‐four glass samples were analyzed by scanning electron microscopy, coupled with an energy dispersive X‐ray spectrometer method and 36 acrylic topcoat paint samples by pyrolysis gas chromatography hyphened with mass spectrometer method. The proposed LR model gave very satisfactory results for the glass comparison problem and for most of the classification tasks for glass. Results of comparison of paints were also highly satisfactory, with only 3.0% false positive answers and 2.8% false negative answers.  相似文献   
134.
Mobile customers are increasingly being tracked and profiled by behavioural advertisers to enhance delivery of personalized advertising. This type of profiling relies on automated processes that mine databases containing personally-identifying or anonymous consumer data, and it raises a host of significant concerns about privacy and data protection. This second article in a two part series on “Profiling the Mobile Customer” explores how to best protect consumers’ privacy and personal data through available mechanisms that include industry self-regulation, privacy-enhancing technologies and legislative reform.1 It discusses how well privacy and personal data concerns related to consumer profiling are addressed by two leading industry self-regulatory codes from the UK and the U.S. that aim to establish fair information practices for behavioural advertising by their member companies. It also discusses the current limitations of using technology to protect consumers from privacy abuses related to profiling. Concluding that industry self-regulation and available privacy-enhancing technologies will not be adequate to close important privacy gaps related to consumer profiling without legislative reform, it offers suggestions for EU and U.S. regulators about how to do this.2  相似文献   
135.
Angola is located in the African continent, in the area of southern Africa and has a population of approximately 14 million inhabitants. The Angola population has origin from Occidental and Southern Bantu people that came from the great lakes region, creating the most ever known African migration of our days.Allele frequencies for the 15 STRs loci in the AmpFlSTR Identifiler kit (D8S1179, D21S11, D7S820, CSF1PO, D3S1358, HUMTH01, D13S317, D16S539, D2S1338, D19S433, HUMVWA, TPOX, D18S51, D5S818, HUMFIBRA/FGA and including the segment of the X-Y homologous gene amelogenin) were studied for Angola population.The genotype frequency of the 15 STR loci showed no significant deviations from Hardy–Weinberg equilibrium expectations and great values for the combined power of discrimination and combined power of a priori exclusion validate the application of these markers in forensic genetics. Comparative analyses between Angola population data and other relevant population database from Africa, Europe and American are presented.  相似文献   
136.
137.
本文基于2004年到2008年上市公司样本数据,研究股权分置改革的政策有效性。考虑到股权分置改革的分批逐步推进特性,本文运用双重差分方法进行分析。研究结果发现,股权分置改革显著改善了公司绩效,总资产收益率提高了2.19%,并且股改具有一定的持续效应,股改当年总资产收益率提高了1.14%,股改后第一年进一步提高1.69%,但第二年开始股改政策效应减弱,在第三年甚至变为显著为负的影响。本文的研究对于认识股权分置改革的有效性及其长期影响有重要意义。  相似文献   
138.
139.
《国际相互影响》2012,38(3):227-247

In 1986 developers and users of quantitative data in international and comparative politics organized to maintain, extend, and develop major datasets and to provide a stronger basis for coordinating data‐related activities. National Science Foundation funding established for a three‐year period Data Development for International Research. Its first phase (DDIR‐I) focused on improving datasets on both national capabilities and international conflict; and generating renewed efforts to better the data collections on internation events and international political economy. DDIR‐I's work, now virtually complete, augmented the quantity and quality of this national data resource and set the stage for another NSF‐funded project on internation event data (DDIR‐II). A final report on DDIR‐II is forthcoming in summer 1994.  相似文献   
140.
《国际相互影响》2012,38(4):462-481
Disaggregated approaches to conflict research have led to new insights into the patterns and processes of political violence in developing countries. This article uses the most comprehensive subnational political violence data (ACLED) to observe where and when violence against civilians occurs within civil wars. Several new conclusions are evident from an event-based analysis of civilian violence: retribution or collateral damage are poor explanations for attacks on the unarmed. Instead, civilians are targeted because they are accessible; rebel groups kill more civilians, often in an attempt to create new frontlines for conflict. However, governments are also responsible for high rates of civilian death, yet they often “contract” this violence out to militias. This analysis confirms that there are multiple violent groups within civil war spaces, and small opposition groups commit higher levels of violence against civilians in local spaces. The strength of a violent group compared to its competition shapes how much civilian violence it commits. The results suggest that theories that emphasize civilian support and retribution as a basis for violence against civilians have overlooked the importance of how multiple violent opposition groups compete within civil wars, and how civilians suffer as a result.  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