全文获取类型
收费全文 | 2629篇 |
免费 | 60篇 |
专业分类
各国政治 | 164篇 |
工人农民 | 123篇 |
世界政治 | 271篇 |
外交国际关系 | 159篇 |
法律 | 1208篇 |
中国政治 | 15篇 |
政治理论 | 729篇 |
综合类 | 20篇 |
出版年
2023年 | 16篇 |
2022年 | 6篇 |
2021年 | 22篇 |
2020年 | 51篇 |
2019年 | 72篇 |
2018年 | 78篇 |
2017年 | 101篇 |
2016年 | 90篇 |
2015年 | 78篇 |
2014年 | 92篇 |
2013年 | 379篇 |
2012年 | 85篇 |
2011年 | 114篇 |
2010年 | 69篇 |
2009年 | 83篇 |
2008年 | 72篇 |
2007年 | 97篇 |
2006年 | 99篇 |
2005年 | 93篇 |
2004年 | 85篇 |
2003年 | 98篇 |
2002年 | 90篇 |
2001年 | 57篇 |
2000年 | 64篇 |
1999年 | 53篇 |
1998年 | 52篇 |
1997年 | 47篇 |
1996年 | 34篇 |
1995年 | 41篇 |
1994年 | 37篇 |
1993年 | 23篇 |
1992年 | 29篇 |
1991年 | 21篇 |
1990年 | 24篇 |
1989年 | 21篇 |
1988年 | 28篇 |
1987年 | 18篇 |
1986年 | 17篇 |
1985年 | 26篇 |
1984年 | 17篇 |
1983年 | 14篇 |
1982年 | 14篇 |
1981年 | 12篇 |
1980年 | 12篇 |
1979年 | 9篇 |
1978年 | 8篇 |
1977年 | 6篇 |
1976年 | 10篇 |
1974年 | 5篇 |
1973年 | 5篇 |
排序方式: 共有2689条查询结果,搜索用时 15 毫秒
931.
932.
933.
Many researchers point to gender inequities in party recruitment practices to explain women’s underrepresentation on the ballot. However, there has been little systematic research about how men and women respond to recruitment, so we do not know whether gender-balanced recruitment would actually lead to gender-balanced outcomes. We conduct two studies to address this question. First, in cooperation with a county Republican Party, we identically recruited 5510 male and 5506 female highly active party members to attend a free candidate training seminar. Republican women were half as likely to respond to the invitation as men. Second, we conducted a survey experiment of 3960 voters on the Utah Colleges Exit Poll. Republican men’s level of self-reported political ambition was increased by the prospect of elite recruitment significantly more than Republican women’s, thereby increasing the gender gap vis-à-vis the control. The gender gap in the effect of recruitment on political ambition among Democrats was much smaller. Together, these findings suggest that to fully understand the role recruitment plays in women’s underrepresentation, researchers must understand the ways in which men and women respond to recruitment, not just whether political elites engage in gendered recruitment practices. 相似文献
934.
Mark Garnett 《The Political quarterly》2020,91(2):489-492
935.
The 2015–17 Parliament was the first time in history that the Conservatives were in government with no easily assembled majority in the House of Lords. This has fundamentally altered the role that Labour is able to play in the Lords and, conversely, that peers are able to play in the Labour party. Yet the political significance of this situation has not yet been fully appreciated by a party which remains culturally antagonistic and constitutionally wary of the Lords. In this paper, we draw on interviews with Labour peers, particularly the late Baroness Hollis of Heigham, who have been able to use the essentially conservative powers of the Lords for social democratic ends. We suggest that the Labour party needs to incorporate the second chamber into both its practical and symbolic politics, and to find ways to use this new source of constitutional power without accommodating to it. 相似文献
936.
937.
Impact of the Indiana Choice Scholarship Program: Achievement Effects for Students in Upper Elementary and Middle School
下载免费PDF全文

This paper examines the impact of the Indiana Choice Scholarship Program on student achievement for low‐income students in upper elementary and middle school who used a voucher to transfer from public to private schools during the first four years of the program. We analyzed student‐level longitudinal data from public and private schools taking the same statewide standardized assessment. Overall, voucher students experienced an average achievement loss of 0.15 SDs in mathematics during their first year of attending a private school compared with matched students who remained in a public school. This loss persisted regardless of the length of time spent in a private school. In English/Language Arts, we did not observe statistically meaningful effects. Although school vouchers aim to provide greater educational opportunities for students, the goal of improving the academic performance of low‐income students who use a voucher to move to a private school has not yet been realized in Indiana. 相似文献
938.
Transparency guarantees in Mexico presented a serious challenge to its 2007–2012 war on drugs. We use an original database of access to information requests, including both petitions for information and appeals to IFAI. We conduct statistical tests on the databases, finding that transparency is lower on security issues, as expected, but that there are unexpected variations between security agencies, and over time. We then conduct a content analysis of freedom of information requests to determine what drives agency responses, finding that security agencies developed various techniques to deflect petitions for information, such as falsely claiming that information has been provided when it has not, claiming that the information is outside the competence of the agency, that it does not exist, or that it is already in the public domain. Also there are significant differences in transparency between security agencies, possibly explained by their operational roles. 相似文献
939.
Our understanding of causality and effect size in randomized field experiments is challenged by variations in levels of baseline treatment dosage in control groups across experiments testing similar treatments. The clearest design is to compare treated cases with no-treatment controls in a sample that lacks any prior treatment at baseline. We applied that strategy in a randomized test of hot-spots police patrols on the previously never-patrolled, track-level platforms of the London Underground (LU). In a pretest–posttest, control-group design, we randomly assigned 57 of the LU's 115 highest crime platforms to receive foot patrol by officers in 15-minute doses, 4 times per day, during 8-hour shifts on 4 days a week for 6 months. The effect of 23,272 police arrivals at the treatment hot spots over 26 weeks was to reduce public calls for service by 21 percent on treated platforms relative to controls, primarily when police were absent (97 percent of the measured effect). This effect was six times larger than the mean standardized effect size found in the leading systematic review. This finding provides a benchmark against the baseline counterfactual of no patrol in hot spots, with strong evidence of residual deterrence and no evidence of local displacement. 相似文献
940.
David W. Bauer Ph.D. Nasir Butt Ph.D. Jennifer M. Hornyak M.S. Mark W. Perlin Ph.D. M.D. 《Journal of forensic sciences》2020,65(2):380-398
Most DNA evidence is a mixture of two or more people. Cybergenetics TrueAllele® system uses Bayesian computing to separate genotypes from mixture data and compare genotypes to calculate likelihood ratio (LR) match statistics. This validation study examined the reliability of TrueAllele computing on laboratory-generated DNA mixtures containing up to ten unknown contributors. Using log(LR) match information, the study measured sensitivity, specificity, and reproducibility. These reliability metrics were assessed under different conditions, including varying the number of assumed contributors, statistical sampling duration, and setting known genotypes. The main determiner of match information and variability was how much DNA a person contributed to a mixture. Observed contributor number based on data peaks gave better results than the number known from experimental design. The study found that TrueAllele is a reliable method for analyzing DNA mixtures containing up to ten unknown contributors. 相似文献