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   310篇
  免费   24篇
各国政治   27篇
工人农民   76篇
世界政治   27篇
外交国际关系   9篇
法律   131篇
中国政治   5篇
政治理论   54篇
综合类   5篇
  2024年   1篇
  2023年   4篇
  2021年   5篇
  2020年   8篇
  2019年   15篇
  2018年   21篇
  2017年   26篇
  2016年   21篇
  2015年   22篇
  2014年   11篇
  2013年   51篇
  2012年   13篇
  2011年   13篇
  2010年   10篇
  2009年   7篇
  2008年   6篇
  2007年   15篇
  2006年   12篇
  2005年   6篇
  2004年   8篇
  2003年   7篇
  2002年   2篇
  2001年   5篇
  2000年   4篇
  1999年   5篇
  1998年   1篇
  1997年   5篇
  1996年   3篇
  1995年   5篇
  1994年   1篇
  1993年   5篇
  1991年   2篇
  1990年   3篇
  1989年   1篇
  1988年   1篇
  1987年   2篇
  1986年   1篇
  1983年   3篇
  1982年   1篇
  1978年   1篇
  1974年   1篇
排序方式: 共有334条查询结果,搜索用时 15 毫秒
11.
Abstract

While the use of active learning exercises and the incorporation of popular culture in the classroom have increased in recent years, the study of potential gendered effects on learning and engagement when it comes to these practices has been limited. In this study, data are collected from international politics courses using a zombie outbreak as the theme for a United Nations simulation to explore whether there are unintentional gendered outcomes from these activities. Contrary to expectations of previous literature, no statistical differences manifest between men and women in enjoyment and learning when using zombie themes in active learning.  相似文献   
12.
13.
14.
15.
Elements of this article first appeared in a paper given at the Hart Conference on Property, 1993.  相似文献   
16.
The present study tested whether theoretically derived risk factors predicted increases in body dissatisfaction and whether gender moderated these relations with data from a longitudinal study of 428 adolescent girls and boys because few prospective studies have examined these aims, despite evidence that body dissatisfaction increases risk for various psychiatric disturbances. Body dissatisfaction showed significant increases for girls and significant decreases for boys during early adolescence. For both genders, parental support deficits, negative affectivity, and self-reported dietary restraint showed significant relations to future increases in body dissatisfaction. Ideal body internalization and body mass index did not demonstrate significant relations to future increases in body dissatisfaction; peer support deficits showed a marginal relation to this outcome. Gender did not moderate these relations, despite adequate power to detect interactive effects.
Sarah Kate BearmanEmail:
  相似文献   
17.
18.
19.
Efficient capillary electrophoretic STR analysis requires rapid, reproducible and robust separation of DNA fragments with reasonable capillary longevity--this is currently accomplished using proprietary commercial polymeric sieving matrices specifically developed for this separation. These matrices, while effective, are costly and do not provide adequate resolution of STR DNA fragments in capillaries with shorter effective separation lengths, increasing the time required to accomplish the separation and minimizing the potential extrapolation to other miniaturized platforms. As the forensic community looks toward next generation microchip technology as a means of processing casework more rapidly, new sieving polymers need to be evaluated for utilization in this platform. The research presented here describes the assessment of commercially-available polymeric sieving matrices for STR analysis, with consideration given to feasibility of incorporation into a microdevice. Polymer composition, molecular weight, and concentration were evaluated, along with an assessment of the effects of buffer composition, separation temperature, and capillary length. These variables were evaluated individually or collectively on the ability to resolve STR DNA fragments and the reproducibility of the separations and the results compared to a proprietary commercial product. A 600,000 Da MW poly(ethylene oxide) (PEO) solution at a 3% (w/v) concentration was determined to be the most suitable matrix for these separations. This polymer, in coated capillaries, provided highly robust and reproducible separations, with near baseline resolution of fragments having single base differences. Reductions in the temperature of the separation, from 60 degrees C to 40 degrees C, and the urea concentration of the buffer, from 7 M to 3.5 M, provided increased longevity of the PEO polymer for repeated separations. Comparison of this polymer with currently specified commercial products used for STR analysis showed that the optimized PEO matrix provided superior separations under all conditions tested. In addition, PEO could be utilized in shorter capillary systems, with a concurrent decrease in analysis time, highlighting its potential for use in shortened capillary or microdevice systems.  相似文献   
20.
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