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   5854篇
  免费   196篇
各国政治   463篇
工人农民   152篇
世界政治   628篇
外交国际关系   365篇
法律   2456篇
中国政治   34篇
政治理论   1878篇
综合类   74篇
  2023年   26篇
  2020年   74篇
  2019年   100篇
  2018年   132篇
  2017年   152篇
  2016年   164篇
  2015年   113篇
  2014年   151篇
  2013年   945篇
  2012年   150篇
  2011年   173篇
  2010年   145篇
  2009年   142篇
  2008年   191篇
  2007年   254篇
  2006年   190篇
  2005年   178篇
  2004年   194篇
  2003年   190篇
  2002年   183篇
  2001年   105篇
  2000年   114篇
  1999年   91篇
  1998年   124篇
  1997年   99篇
  1996年   108篇
  1995年   81篇
  1994年   73篇
  1993年   87篇
  1992年   73篇
  1991年   91篇
  1990年   78篇
  1989年   70篇
  1988年   78篇
  1987年   88篇
  1986年   85篇
  1985年   52篇
  1984年   71篇
  1983年   70篇
  1982年   66篇
  1981年   51篇
  1980年   47篇
  1979年   44篇
  1978年   44篇
  1977年   46篇
  1976年   26篇
  1975年   26篇
  1974年   27篇
  1973年   34篇
  1972年   23篇
排序方式: 共有6050条查询结果,搜索用时 46 毫秒
961.
We explore the dynamics of competitive search in the K–12 public education sector. Using detailed panel data on teacher hiring from Boston Public Schools, we document how teacher labor supply varies substantially across vacancies even within a single district depending on position type, school characteristics, and the timing of job postings. We find that early-posted positions are more likely to be filled and end up securing new hires that are better qualified, more effective, and more likely to remain at a school. In contrast, the number of applicants to a position is largely unassociated with hire quality, suggesting that schools may struggle to identify and select the best candidates even when there is a large pool of qualified applicants. These patterns persist even when we restrict comparisons to only positions within an individual school using school fixed effects. Our findings point to substantial unrealized potential for improving teacher hiring.  相似文献   
962.
This article analyses the emergence of United Russia (Edinaya Rossiya) as a dominant party by examining the behaviour of Russia's governors. Using original data on when governors joined United Russia, the article demonstrates that those governors with access to autonomous political resources were more reluctant to join the dominant party. By showing that Russian elite members made their affiliation decisions on the basis of calculations about their own political resources rather than simply being coerced by the Kremlin, this article provides evidence for a theory of dominant party formation that casts the problem as a two-sided commitment problem between leaders and elites.  相似文献   
963.
Native species of trees and shrubs contribute significantly to farmers' livelihoods by supplying food, medicinal products, fodder, and wood. In the case study reported in this article, this contribution to farmers' annual revenue varied from 26 per cent to 73 per cent, and was as high as US$ 650 a year for households for which agroforestry products were the primary source of revenue. Household consumption was not quantified in the study, but farmers' comments confirmed that native trees also played an important role in assuring food security, especially in the ‘hunger period’ when grain stores are low and farmers are waiting for the next harvest.  相似文献   
964.
965.
A 32‐year‐old woman collapsed following an intravenous injection of material that included crushed pharmaceutical tablets. Resuscitation was attempted but was unsuccessful. She had an extensive past medical history of complications resulting from intravenous drug use. Death was due to mixed drug toxicity. The major findings at autopsy included a 10 mm deep skin sinus over the right femoral vein that was used as an injection site. Polarizable foreign material was present at the injection site and also within the lungs with a granulomatous reaction. Of note, a probe‐patent foramen ovale had permitted paradoxical embolization of this material into the systemic circulation with lodgement within the liver, portal lymph nodes, myocardium, spleen, kidneys, and pancreas. This case highlights the importance of checking for any intracardiac shunts, which may be quite small, and systemic dissemination of foreign material to multiple organs in intravenous drug users who present for medicolegal assessment.  相似文献   
966.
Forensic DNA interpretation is transitioning from manual interpretation based usually on binary decision‐making toward computer‐based systems that model the probability of the profile given different explanations for it, termed probabilistic genotyping (PG). Decision‐making by laboratories to implement probability‐based interpretation should be based on scientific principles for validity and information that supports its utility, such as criteria to support admissibility. The principles behind STRmix? are outlined in this study and include standard mathematics and modeling of peak heights and variability in those heights. All PG methods generate a likelihood ratio (LR) and require the formulation of propositions. Principles underpinning formulations of propositions include the identification of reasonably assumed contributors. Substantial data have been produced that support precision, error rate, and reliability of PG, and in particular, STRmix?. A current issue is access to the code and quality processes used while coding. There are substantial data that describe the performance, strengths, and limitations of STRmix?, one of the available PG software.  相似文献   
967.
Various methodological approaches to constructing external and internal benchmarks have been applied to estimate racial bias in police stop, question, and frisk (SQF) patterns. We apply an external benchmark of the race of the residential population and an internal benchmark of similarly-situated stops to estimate if racial disparities in New York City SQF data were impacted by the Floyd, et al. v. City of New York court settlement. We find that after the settlement, the racial composition of census tracts were no longer significant predictors of the stop rate after controlling for reported crime, socioeconomic factors, and police precincts. We further find that differences in SQF outcomes and hit rates between Blacks and Hispanics and similarly-situated others diminished substantially after the settlement. These findings suggest that court reforms may be an effective method for reducing racial disparities in SQF patterns.  相似文献   
968.
This article charts how security‐cleared counsel have been constructed as a mechanism for managing the tension between security and fairness in secret trials and transferred across national boundaries as an example of ‘best practice', before going on to evaluate recent cross‐cultural and transnational research on this ‘best practice'. Particular attention is paid to the central role played by the European Court of Human Rights (ECtHR) in promoting the role of ‘special advocates’ and a contrast is made between the methodologies deployed by the Court and those used in recent research to identify and problematize ‘best practice’ within the closed world of security‐cleared counsel. The article then goes on to explore the relationship between ‘best practice’ and procedural tradition and argues that normative solutions advancing ‘best practice’ need to pay careful attention to the procedural contexts and cultures in which they are embedded.  相似文献   
969.
970.
The current study builds on prior research examining racial disparities in sentencing. Entropy weighting is introduced as a new method for estimating racial disparities that has several advantages over traditionally used methods. Entropy weighting is compared to regression and propensity score methods in estimating Black-White disparities in incarceration sentences. Although all methods find non-significant racial disparities in incarceration sentences, regression and propensity score methods underestimate disparities in incarceration sentence lengths. Entropy weighting provides comparable estimates to propensity score methods, but assures that the samples are identical on all covariates aside from race. The method offers researchers a useful and flexible approach for estimating racial disparities in criminal justice, and its use may lead to alternative conclusions about the size and presence of racial disparities in sentencing.  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