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   1090篇
  免费   59篇
各国政治   52篇
工人农民   45篇
世界政治   176篇
外交国际关系   103篇
法律   485篇
中国政治   7篇
政治理论   276篇
综合类   5篇
  2023年   4篇
  2021年   6篇
  2020年   11篇
  2019年   23篇
  2018年   41篇
  2017年   46篇
  2016年   45篇
  2015年   29篇
  2014年   25篇
  2013年   166篇
  2012年   46篇
  2011年   44篇
  2010年   32篇
  2009年   32篇
  2008年   49篇
  2007年   61篇
  2006年   41篇
  2005年   52篇
  2004年   46篇
  2003年   47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1149条查询结果,搜索用时 15 毫秒
261.
262.
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   
263.
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   
264.

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   
265.
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   
266.
267.
268.
In the context of US urban jails, incarceration is often seen as an opportune intervention point for prevention interventions in public health. For the detained individual, it is an opportunity to reflect on individual choices and the potential for changes in one's life course. For population focused public health professionals, jail detention facilities represent a concentration of health risks, and an opportunity to have an impact on a significant portion of those at risk for HIV and other health concerns. This paper presents an innovative education and empowerment model that bridges across jail walls, beginning on the inside, and continuing on the outside of jail where individuals continue to be challenged and supported toward positive health and social choices. The intervention also seeks to foment community activism in the communities to which jail detainees return, thus aiming to have a structural impact. This paper examines both the intervention model and the challenges of examining the effectiveness claims for the intervention at multiple levels.  相似文献   
269.
270.
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