全文获取类型
收费全文 | 9166篇 |
免费 | 275篇 |
专业分类
各国政治 | 472篇 |
工人农民 | 434篇 |
世界政治 | 530篇 |
外交国际关系 | 283篇 |
法律 | 5742篇 |
中国共产党 | 3篇 |
中国政治 | 63篇 |
政治理论 | 1837篇 |
综合类 | 77篇 |
出版年
2020年 | 115篇 |
2019年 | 155篇 |
2018年 | 221篇 |
2017年 | 240篇 |
2016年 | 224篇 |
2015年 | 157篇 |
2014年 | 167篇 |
2013年 | 1012篇 |
2012年 | 243篇 |
2011年 | 239篇 |
2010年 | 194篇 |
2009年 | 220篇 |
2008年 | 272篇 |
2007年 | 231篇 |
2006年 | 262篇 |
2005年 | 238篇 |
2004年 | 246篇 |
2003年 | 215篇 |
2002年 | 223篇 |
2001年 | 276篇 |
2000年 | 281篇 |
1999年 | 201篇 |
1998年 | 125篇 |
1997年 | 125篇 |
1996年 | 113篇 |
1995年 | 103篇 |
1994年 | 102篇 |
1993年 | 116篇 |
1992年 | 188篇 |
1991年 | 203篇 |
1990年 | 182篇 |
1989年 | 182篇 |
1988年 | 164篇 |
1987年 | 183篇 |
1986年 | 178篇 |
1985年 | 166篇 |
1984年 | 162篇 |
1983年 | 170篇 |
1982年 | 100篇 |
1981年 | 92篇 |
1980年 | 79篇 |
1979年 | 108篇 |
1978年 | 78篇 |
1977年 | 76篇 |
1976年 | 61篇 |
1975年 | 61篇 |
1974年 | 63篇 |
1973年 | 73篇 |
1972年 | 63篇 |
1968年 | 53篇 |
排序方式: 共有9441条查询结果,搜索用时 15 毫秒
291.
Lindsay Rice Joan M. Barth Rosanna E. Guadagno Gabrielle P. A. Smith Debra M. McCallum 《Journal of youth and adolescence》2013,42(7):1028-1040
Social cognitive models examining academic and career outcomes emphasize constructs such as attitude, interest, and self-efficacy as key factors affecting students’ pursuit of STEM (science, technology, engineering and math) courses and careers. The current research examines another under-researched component of social cognitive models: social support, and the relationship between this component and attitude and self-efficacy in math and science. A large cross-sectional design was used gathering data from 1,552 participants in four adolescent school settings from 5th grade to early college (41 % female, 80 % white). Students completed measures of perceived social support from parents, teachers and friends as well as their perceived ability and attitudes toward math and science. Fifth grade and college students reported higher levels of support from teachers and friends when compared to students at other grade levels. In addition, students who perceived greater social support for math and science from parents, teachers, and friends reported better attitudes and had higher perceptions of their abilities in math and science. Lastly, structural equation modeling revealed that social support had both a direct effect on math and science perceived abilities and an indirect effect mediated through math and science attitudes. Findings suggest that students who perceive greater social support for math and science from parents, teachers, and friends have more positive attitudes toward math and science and a higher sense of their own competence in these subjects. 相似文献
292.
Vangie A. Foshee Thad S. Benefield Heath Luz McNaughton Reyes Susan T. Ennett Robert Faris Ling-Yin Chang Andrea Hussong Chirayath M. Suchindran 《Journal of youth and adolescence》2013,42(4):471-486
The peer context is a central focus in research on adolescent risk behaviors but few studies have investigated the role of the peer context in the perpetration of adolescent dating violence. This longitudinal study examined between-subjects and within-person contemporaneous and lagged effects of peer attributes, measured with social network analyses, on trajectories of dating violence perpetration and determined if effects varied by grade and/or sex of the adolescent. Data are from adolescents who participated in a five-wave panel study beginning when they were in 7 through 9th grade and ending when they were in 10 through 12th grade (n = 3,412); half were male, 40.5 % were white, 49.9 % were black and 10.4 % were of another race/ethnicity. Significant between-subjects effects indicate that adolescents who typically have friends who use dating violence, and girls who are typically high in social status, are at increased risk for using dating violence throughout adolescence. Adolescents who typically have high quality friendships and girls who typically have friends with pro-social beliefs are at decreased risk for using dating violence throughout adolescence. Significant within-person contemporaneous effects indicate that both boys and girls reported lower levels of dating violence than usual at times when they had more friends with pro-social beliefs, and reported higher levels of dating violence than usual at times when they had higher social status. None of the lagged effects were significant and none of the effects varied across grade. These findings suggest that the peer context plays an important role in the development of the perpetration of adolescent dating violence. 相似文献
293.
Joseph P. Ryan Abigail B. Williams Mark E. Courtney 《Journal of youth and adolescence》2013,42(3):454-465
Victims of child abuse and neglect are at an increased risk of involvement with the juvenile justice and adult correctional systems. Yet, little is known about the continuation and trajectories of offending beyond initial contact with law enforcement. Neglect likely plays a critical role in continued offending as parental monitoring, parental rejection and family relationships are instrumental in explaining juvenile conduct problems. This study sought to determine whether neglect is associated with recidivism for moderate and high risk juvenile offenders in Washington State. Statewide risk assessments and administrative records for child welfare, juvenile justice, and adult corrections were analyzed. The sample was diverse (24 % female, 13 % African American, 8 % Hispanic, 5 % Native American) and included all moderate and high risk juvenile offenders screened by juvenile probation between 2004 and 2007 (n = 19,833). Official records from child protection were used to identify juvenile offenders with a history of child neglect and to identify juvenile offenders with an ongoing case of neglect. Event history models were developed to estimate the risk of subsequent offending. Adolescents with an ongoing case neglect were significantly more likely to continue offending as compared with youth with no official history of neglect. These findings remain even after controlling for a wide range of family, peer, academic, mental health, and substance abuse covariates. Interrupting trajectories of offending is a primary focus of juvenile justice. The findings of the current study indicate that ongoing dependency issues play a critical role in explaining the outcomes achieved for adolescents in juvenile justice settings. The implications for improved collaboration between child welfare and juvenile justice are discussed. 相似文献
294.
Lindsay E. Shannon 《Women's history review》2013,22(2):295-309
Eve Drewelowe (1899–1988) was an American artist who attended the University of Iowa, where she received a BA in Graphic and Plastic Arts in 1923. During these early years when university art programs were being established, Drewelowe became the first person to receive an MA in art from the University of Iowa; one of the first people to receive such a degree in the United States. Drewelowe reinvented herself throughout her life and her artwork reflects a current knowledge of modern styles that emerged in the twentieth century. Drewelowe exhibited under the name Eve Drewelowe Van Ek shortly after her marriage in 1924 until the early 1950s, when she chose to resume using only her own surname. During the three intervening decades, her signature varies from one artwork to the next. In some instances, the artist later rubbed out or painted over the ‘Van Ek’ with little attempt to conceal the change, leaving a visual indicator of the artist's identity struggles. Her personal papers also reflect the challenges she faced reconciling public expectations of her role as the wife of a university dean with her profession as an artist. This essay considers the ways Drewelowe performed her identity as an artist in order to maintain her personal autonomy against the backdrop of the male dominated social and artistic world. 相似文献
295.
Dr. Laura E. Donaldson 《Women's Studies: An inter-disciplinary journal》2013,42(3-4):373-387
Wanton Eyes &; Chaste Desires: Female Sexuality in The Faerie Queene. By Sheila T. Cavanagh. Bloomington: Indiana University Press, 1994. Colonial American Travel Narratives. Edited by Wendy Martin. London and New York: Penguin, 1994. The Invention of Pornography: Obscenity and the Origins of Modernity, 1500–1800. Edited by Lynn Hunt. New York: Zone Books, 1993. 相似文献
296.
297.
298.
299.
300.
David Córdova Seth J. Schwartz Jennifer B. Unger Lourdes Baezconde-Garbanati Juan A. Villamar Daniel W. Soto Sabrina E. Des Rosiers Tae Kyoung Lee Alan Meca Miguel Ángel Cano Elma I. Lorenzo-Blanco Assaf Oshri Christopher P. Salas-Wright Brandy Piña-Watson Andrea J. Romero 《Journal of youth and adolescence》2016,45(10):2164-2177