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   515篇
  免费   33篇
各国政治   13篇
工人农民   79篇
世界政治   20篇
外交国际关系   15篇
法律   315篇
中国共产党   1篇
中国政治   9篇
政治理论   94篇
综合类   2篇
  2023年   5篇
  2022年   6篇
  2021年   6篇
  2020年   24篇
  2019年   18篇
  2018年   24篇
  2017年   22篇
  2016年   34篇
  2015年   19篇
  2014年   20篇
  2013年   64篇
  2012年   20篇
  2011年   24篇
  2010年   18篇
  2009年   30篇
  2008年   33篇
  2007年   26篇
  2006年   19篇
  2005年   20篇
  2004年   23篇
  2003年   22篇
  2002年   18篇
  2001年   6篇
  2000年   3篇
  1999年   6篇
  1998年   8篇
  1997年   2篇
  1996年   5篇
  1994年   3篇
  1993年   3篇
  1992年   1篇
  1991年   3篇
  1990年   1篇
  1989年   1篇
  1987年   2篇
  1986年   1篇
  1985年   1篇
  1984年   1篇
  1983年   1篇
  1982年   1篇
  1980年   2篇
  1978年   1篇
  1976年   1篇
排序方式: 共有548条查询结果,搜索用时 31 毫秒
141.
142.
143.
Like oysters on the half shell, some things are better when they're raw. In evaluating the performance of organizations and providing guidance for improving performance, however, raw performance measures, such as test scores or success rates, are often inferior to performance measures adjusted for client and environmental characteristics, or adjusted performance measures (APMs). Using examples from a variety of public services and data on public schools in Georgia, we compare the performance data generated by raw scores and by APMs. We conclude with guidance for constructing and using adjusted performance measures.  相似文献   
144.
Recent changes in welfare policy have produced changes in parental work and welfare receipt. These factors are assessed in relation to investigated reports of child abuse and neglect using survey data on 1998 welfare recipients in nine Illinois counties, in conjunction with longitudinal administrative data on cash welfare benefits, employment, and child abuse and neglect reports. Trend analyses show that rates of child maltreatment reports among welfare recipients have risen since the passage of PRWORA in 1996. Findings from multivariate analyses indicate that parental employment has a protective effect on reports to child protection systems (CPS), that this effect is greatest when combined with welfare receipt, and that this effect becomes stronger over time. Those who receive welfare in the absence of employment face a significantly greater risk of CPS involvement, even compared with those who neither work nor receive welfare. © 2003 by the Association for Public Policy Analysis and Management  相似文献   
145.
Journal of Youth and Adolescence - Research has indicated that lesbian, gay, bisexual, and queer/questioning (LGBQ) adolescents have disproportionately high rates of substance use compared to...  相似文献   
146.
Three commercially available integrated rapid DNA instruments were tested as a part of a rapid DNA maturity assessment in July of 2018. The assessment was conducted with sets of blinded single-source reference samples provided to participants for testing on the individual rapid platforms within their laboratories. The data were returned to the National Institute of Standards and Technology (NIST) for review and analysis. Both FBI-defined automated review (Rapid DNA Analysis) and manual review (Modified Rapid DNA Analysis) of the datasets were conducted to assess the success of genotyping the 20 Combined DNA Index System (CODIS) core STR loci and full profiles generated by the instruments. Genotype results from the multiple platforms, participating laboratories, and STR typing chemistries were combined into a single analysis. The Rapid DNA Analysis resulted in a success rate of 80% for full profiles (85% for the 20 CODIS core loci) with automated analysis. Modified Rapid DNA Analysis resulted in a success rate of 90% for both the CODIS 20 core loci and full profiles (all attempted loci per chemistry). An analysis of the peak height ratios demonstrated that 95% of all heterozygous alleles were above 59% heterozygote balance. For base-pair sizing precision, the precision was below the standard 0.5 bp deviation for both the ANDE 6C System and the RapidHIT 200.  相似文献   
147.
This paper investigates the impact of extending free school lunch to all students, regardless of income, on academic performance in New York City middle schools. Using a difference-in-differences design and unique longitudinal, student-level data, we derive credibly causal estimates of the impacts of “Universal Free Meals” (UFM) on test scores in English Language Arts (ELA) and mathematics, and participation in school lunch. We find UFM increases academic performance by as much as 0.083 standard deviations in math and 0.059 in ELA for non-poor students, with smaller, statistically significant effects of 0.032 and 0.027 standard deviations in math and ELA for poor students. Further, UFM increases participation in school lunch by roughly 11.0 percentage points for non-poor students and 5.4 percentage points for poor students. We then investigate the academic effects of school lunch participation per se, using UFM as an instrumental variable. Results indicate that increases in school lunch participation improve academic performance for both poor and non-poor students; an additional lunch every two weeks increases test scores by roughly 0.08 standard deviations in math and 0.07 standard deviations in ELA. Finally, we explore potential unintended consequences for student weight outcomes, finding no evidence that UFM increases the probability that students are obese or overweight. We also find no evidence of increases in average body mass index (BMI). Instead, we find some evidence that participation in school lunch improves weight outcomes for non-poor students. Results are robust to an array of alternative specifications and assumptions about the sample.  相似文献   
148.
Psychological Injury and Law - Survival following traumatic brain injury (TBI) has increased following advances in medical care. However, TBI survivors often experience significant deficits in...  相似文献   
149.
Alexander  Amy C.  Bågenholm  Andreas  Charron  Nicholas 《Public Choice》2020,184(3-4):235-261
Public Choice - This study focuses on gender differences in voter reactions to a corruption scandal in one’s preferred party. We analyze, in a framework of ‘exit, voice and...  相似文献   
150.
A purposively recruited, ethnically diverse sample (N = 27) of young adolescents and their mothers in domestic violence shelters described adolescents' coping responses during adult intimate partner violence as part of a qualitative study using Life Story methods. Findings revealed competing demands and several responses, including: leaving home, collaborating with family members for safety, calling police, verbally or physically intervening, seeking help outside the family, and palliative responses. Participants provided context-rich accounts of coping and coping goals during violence, including information on help-seeking and police involvement. Implications are discussed for future research and developing interventions to improve safety and psychological outcomes.  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