全文获取类型
收费全文 | 1076篇 |
免费 | 56篇 |
专业分类
各国政治 | 52篇 |
工人农民 | 42篇 |
世界政治 | 174篇 |
外交国际关系 | 101篇 |
法律 | 479篇 |
中国政治 | 7篇 |
政治理论 | 272篇 |
综合类 | 5篇 |
出版年
2023年 | 4篇 |
2021年 | 6篇 |
2020年 | 11篇 |
2019年 | 21篇 |
2018年 | 40篇 |
2017年 | 45篇 |
2016年 | 44篇 |
2015年 | 28篇 |
2014年 | 25篇 |
2013年 | 162篇 |
2012年 | 46篇 |
2011年 | 44篇 |
2010年 | 31篇 |
2009年 | 31篇 |
2008年 | 48篇 |
2007年 | 59篇 |
2006年 | 40篇 |
2005年 | 52篇 |
2004年 | 46篇 |
2003年 | 46篇 |
2002年 | 42篇 |
2001年 | 18篇 |
2000年 | 17篇 |
1999年 | 24篇 |
1998年 | 11篇 |
1997年 | 9篇 |
1996年 | 10篇 |
1995年 | 11篇 |
1994年 | 20篇 |
1993年 | 13篇 |
1992年 | 8篇 |
1991年 | 15篇 |
1990年 | 9篇 |
1989年 | 7篇 |
1988年 | 9篇 |
1987年 | 4篇 |
1986年 | 6篇 |
1985年 | 7篇 |
1984年 | 4篇 |
1983年 | 7篇 |
1982年 | 4篇 |
1981年 | 8篇 |
1980年 | 7篇 |
1979年 | 4篇 |
1977年 | 8篇 |
1976年 | 4篇 |
1975年 | 3篇 |
1974年 | 2篇 |
1968年 | 2篇 |
1966年 | 2篇 |
排序方式: 共有1132条查询结果,搜索用时 15 毫秒
261.
262.
263.
264.
265.
266.
This paper evaluates the two most common methods of measuring voter time-of-decision??the recall method and the panel method??and asks whether the two methods are consistent with each other. Using data from the National Annenberg Election Survey collected during the 2008 U.S. presidential election, the findings suggest that these two methods measure different concepts, and thus cannot be used interchangeably. Furthermore, discrepancies between the two methods suggest that the accepted model of early, campaign, and late decision-making should be adjusted to account for a fourth group of voters that never changes their vote intention, but does not truly commit to that intention until later in the campaign. The concept of uncommitted early deciders is offered to describe this group, created by combining the two methods. 相似文献
267.
Peter Bergman Jeffrey T. Denning Dayanand Manoli 《Journal of policy analysis and management》2019,38(3):706-731
There is increasing evidence that tax benefits for college do not affect college enrollment. This may be because prospective students do not know about tax benefits for college or because the design of tax benefits is not conducive to affecting educational outcomes. We focus on changing awareness of tax benefits by providing information to students or prospective students. We sent e‐mails and letters to students that described tax benefits for college, and we tracked college outcomes. For all three of our samples—rising high school seniors, already enrolled students, and students who had previously applied to college but were not currently enrolled—information about tax benefits for college did not affect enrollment or reenrollment. We test whether effects vary according to information frames and found that no treatment arms changed student outcomes. We conclude that awareness is not the primary reason that tax benefits for college do not affect enrollment. 相似文献
268.
Elizabeth Dhuey David Figlio Krzysztof Karbownik Jeffrey Roth 《Journal of policy analysis and management》2019,38(3):538-578
We present evidence of a positive relationship between school starting age and children's cognitive development from ages 6 to 18 using a fuzzy regression discontinuity design and large‐scale population‐level birth and school data from the state of Florida. We estimate effects of being old for grade (being born in September vs. August) that are remarkably stable—always around 0.2 SD difference in test scores—across a wide range of heterogeneous groups, based on maternal education, poverty at birth, race/ethnicity, birth weight, gestational age, and school quality. While the September‐August difference in kindergarten readiness is dramatically different by subgroup, by the time students take their first exams, the heterogeneity in estimated effects on test scores effectively disappears. We do, however, find significant heterogeneity in other outcome measures such as disability status and middle and high school course selections. We also document substantial variation in compensatory behaviors targeted towards young‐for‐grade children. While the more affluent families tend to redshirt their children, young‐for‐grade children from less affluent families are more likely to be retained in grades prior to testing. School district practices regarding retention and redshirting are correlated with improved outcomes for the groups less likely to use those remediation approaches (i.e., retention in the case of more affluent families and redshirting in the case of less affluent families.) Finally, we find that very few school policies or practices mitigate the test score advantage of September‐born children. 相似文献
269.
Purpose
A number of policy efforts have aimed to reduce drunk driving, including deterrence-based policies and specialized treatment courts. This study examines the impact of expedited court processing on the county-wide rate of DUI offenses. It also examines the links between sanction swiftness, certainty, and severity and changes in DUI rates over time.Methods
This study uses interrupted time series analysis to assess changes in DUI rates in one county over a time period including the introduction of a full-coverage, expedited court docket for DUI. Additionally, the three components of deterrence were examined.Result
Findings reveal that the program implementation corresponded with a lower rate of DUI case filings, but not with a general reduction in alcohol-involved collisions in the county. Additionally, only sanction swiftness improved over time, while certainty remained stable and severity declined.Conclusions
Results indicate that the introduction of the expedited court docket does not appear to have produced a deterrent effect on DUI. It may be that DUI offenders require more than expedited processing to overcome the issues that precipitate their offending. Future research and policy should explore both the impact of swiftness of punishment and the provision of appropriate treatment services in addressing DUI offending. 相似文献270.
The determination of the cause and manner of death for a body recovered from the water can be difficult because of a lack of autopsy findings specific for drowning. This case report describes a 30-year-old man found submerged at the bottom of a hotel pool. An autopsy revealed scleral hemorrhages and fascial hemorrhages of multiple muscles of the anterior and posterior neck bilaterally. No evidence of traumatic injury was on the surface of the body. An investigation by law enforcement found no evidence of foul play. The occurrence of petechial and neck hemorrhage in a body recovered from the water is controversial, and a review of this literature will be given. We suggest that fascial hemorrhages of the muscles of the neck, as well as cephalic hemorrhages, can be explained by drowning-related elevated central venous pressure that is communicated to the head through the valveless veins of the neck. 相似文献