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   16251篇
  免费   199篇
各国政治   722篇
工人农民   1393篇
世界政治   766篇
外交国际关系   611篇
法律   9478篇
中国共产党   7篇
中国政治   67篇
政治理论   3377篇
综合类   29篇
  2022年   37篇
  2021年   58篇
  2020年   120篇
  2019年   161篇
  2018年   1494篇
  2017年   1415篇
  2016年   1228篇
  2015年   233篇
  2014年   222篇
  2013年   890篇
  2012年   415篇
  2011年   1122篇
  2010年   1179篇
  2009年   795篇
  2008年   1008篇
  2007年   975篇
  2006年   319篇
  2005年   288篇
  2004年   416篇
  2003年   338篇
  2002年   226篇
  2001年   358篇
  2000年   332篇
  1999年   224篇
  1998年   109篇
  1997年   108篇
  1996年   86篇
  1995年   93篇
  1994年   91篇
  1993年   50篇
  1992年   137篇
  1991年   153篇
  1990年   142篇
  1989年   138篇
  1988年   125篇
  1987年   138篇
  1986年   110篇
  1985年   111篇
  1984年   112篇
  1983年   100篇
  1982年   68篇
  1981年   84篇
  1980年   40篇
  1979年   85篇
  1978年   55篇
  1977年   39篇
  1975年   41篇
  1974年   53篇
  1973年   57篇
  1972年   40篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
321.
The aim of this five-wave longitudinal study was to investigate the relationship between anxiety and adolescent identity development. Participants were 1,313 adolescents who annually completed measures of anxiety and identity. Growth Mixture Modeling (GMM) analyses demonstrated that the adolescent population was best typified by two latent growth trajectory classes: a low anxiety class (n = 1,199) characterized by a low initial level of anxiety that decreased over time and a high anxiety class (n = 114) characterized by a higher initial level of anxiety that increased over time. To answer our research question, we tested a model in which the anxiety classes predicted initial levels and rates of change of three identity dimensions: commitment, in-depth exploration, and reconsideration of commitment. Findings indicated that the high anxiety adolescents displayed a more troublesome identity development than their low anxiety peers, since their commitments became weaker with age, and they reconsidered them intensively.
Wim MeeusEmail:

Elisabetta Crocetti   is a post-doctoral researcher of the University of Macerata. She received her Ph.D. in Educational Sciences from the University of Macerata. Theo Klimstra   is a doctoral student at the Research Centre Adolescent Development of Utrecht University. Loes Keijsers   is a doctoral student at the Research Centre Adolescent Development of Utrecht University. William W. Hale III   is Assistant Professor at the Research Centre Adolescent Development, Utrecht University. He received his Ph.D. at the Department of Biological Psychiatry, University of Groningen. Wim Meeus   is Professor of Adolescent Development and chair of the Research Centre Adolescent Development of Utrecht University. He received his Ph.D. in Social Psychology from the Utrecht University.  相似文献   
322.
Experiences with racism are a common occurrence for African American youth and may result in negative self perceptions relevant for the experience of depressive symptoms. This study examined the longitudinal association between perceptions of racism and depressive symptoms, and whether perceived academic or social control mediated this association, in a community epidemiologically-defined sample of urban African American adolescents (N = 500; 46.4% female). Structural equation modeling revealed that experiences with racism were associated with low perceived academic control, which in turn was associated with increased depressive symptoms. Findings suggest that experiences with racism can have long lasting effects for African American youth’s depressive symptoms, and highlight the detrimental effects of experiences with racism for perceptions of control in the academic domain. Implications for intervention are discussed.
Sharon F. LambertEmail:
  相似文献   
323.
The present study provides a comparative analysis of sexual-minority and heterosexual emerging adult women’s experiences seeking support for sexual issues from parents and friends. Participants included 229 college women (88 sexual-minority women; 141 heterosexual women), ranging from 18 to 25 years of age, who provided written responses to an inquiry about a time they went to friends and parents for support for a issue related to their sexuality. Responses indicated that the majority of participants had sought support from either a parent or a friend and that mothers and female friends were more likely involved than fathers or male friends, respectively. Sexual issues that participants reported discussing with parents and friends were inductively grouped into five categories: dating and romantic relationships, sexual behavior, sexual health, identity negotiation, and discrimination and violence. Issues that were discussed differed based on sexual orientation identity and the source of support (parent or friend); they did not differ by age. Participants generally perceived parents and friends’ responses as helpful, though sexual-minority participants perceived both parents and friends’ responses as less helpful than did heterosexual participants. Overall, results suggest both similarities and differences between sexual-minority and heterosexual young women’s experiences seeking support for sexual issues from parents and friends.  相似文献   
324.
The current cross-sectional study investigated the links between various dimensions of organized activity involvement and depressive symptoms, loneliness, and peer victimization in an ethnically and economically diverse sample of adolescents (N = 152; 58% female). Results indicate that adolescents who were involved in organized activities for more years also reported lower levels of loneliness. There was evidence of diminishing returns when adolescents were very highly involved in organized activities; those who were either under- or over-involved reported the highest levels of depressive symptoms. Conversely, findings indicate that adolescents who participated in a narrow or wide range of activity contexts reported the lowest levels of depressive symptoms. In addition, results suggested that the relation between organized activity involvement and adjustment differs among adolescents from diverse ethnic and socioeconomic backgrounds. Findings from the current study also underscore the importance of considering multiple indices of activity involvement when assessing its association with adjustment.
Edin T. RandallEmail:
  相似文献   
325.
Growth curve analyses were used to investigate parents’ and peers’ influence on adolescents’ choice to abstain from antisocial behavior in a community-based sample of 416 early adolescents living in the Southeastern United States. Participants were primarily European American (91%) and 51% were girls. Both parents and peers were important influences on the choice to abstain from antisocial behavior. Over the four-year period adolescents relied increasingly on parents as influences and relied less on peers as influences to deter antisocial behavior. Significant gender differences emerged and suggested that female adolescents relied more on social influences than did male adolescents but that as time progressed male adolescents increased the rate at which they relied on peers. Higher family income was associated with choosing peers as a social influence at wave 1, but no other significant income associations were found. Understanding influences on adolescents’ abstinence choices is important for preventing antisocial behavior.
Emily C. CookEmail:

Emily C. Cook   is in her final year of doctoral studies in human development and family studies at the University of North Carolina at Greensboro. Her research interests include peer influences and parental influences on adolescents’ problem behaviors, parental influences on adolescents’ social development, and effective prevention and interventions for adolescents who exhibit problem behaviors. Cheryl Buehler   is a professor of human development and family studies at the University of North Carolina at Greensboro. Her research interests include marital conflict, marital relations, parenting, and adolescent well-being. Robert Henson   is an assistant professor of educational research methodology at the University of North Carolina at Greensboro. Dr. Henson’s research interests include educational measurement, cognitive diagnosis models, hierarchical linear models, and mathematical statistics.  相似文献   
326.
Little attention has been paid to the role of peer social capital in the school context, especially as a predictor of adolescents’ academic outcomes. This study uses a nationally representative (N = 13,738, female = 51%), longitudinal sample and multilevel models to examine how peer networks impact educational achievement and attainment. Results reveal that, in addition to those factors typically associated with academic outcomes (e.g., school composition), two individual-level peer network measures, SES and heterogeneity, had significant effects. Although educational attainment was generally worse in low SES schools, for all ethnic groups higher attainment was associated with attending schools with higher concentrations of minority students. At the individual level, however, membership in integrated peer networks was negatively related to high school graduation for Asians, Latinos, and non-Hispanic whites, and to GPA for Asians and Latinos, as only African-American achievement increased in more racially/ethnically heterogeneous peer networks. Our results suggest that co-ethnic and co-racial peer friendship networks should not be viewed as obstacles to the educational accomplishments of today’s youth. In fact, in many cases the opposite was true, as results generally support the ethnic social capital hypothesis while providing little corroboration for oppositional culture theory. Results also suggest that co-racial and co-ethnic ties may mediate the negative effects of school choice, or more specifically of between-school socioeconomic segregation. Consequently, we conclude that school policies aimed at socioeconomic desegregation are likely to beneficially affect the academic outcomes of all race/ethnic groups.
Igor RyabovEmail:
  相似文献   
327.
Physiologic reactivity to racially rejecting images was assessed in 35 young adults (10 males, 25 female) from African-American backgrounds using the startle probe paradigm. In a laboratory setting, participants viewed 16 images depicting racial rejection, racial acceptance, nonracial negative, and nonracial positive themes. While viewing these images, startling bursts of noise were presented and the magnitude of the eyeblink responses were measured. Results supported an attentional mechanism which suggests that, while viewing both racially rejecting and nonracial positive images, individuals may be so absorbed in processing the images that they appear less distracted by the startling noise. However, these patterns were only found for participants low in racial regard. Young adults who felt positively about their racial background did not exhibit differential processing of startle stimuli as a function of slide themes. Race-rejection sensitivity did not moderate startle reactivity. Developmental implications, particularly in light of coping with racial discrimination, are discussed.
Lisa KiangEmail:
  相似文献   
328.
African indigenous vegetables (AIVs) have potential to sustainably address malnutrition, a growing problem in sub-Saharan Africa. Their consumption is however, limited by poor perceptions and lack of awareness of nutritional benefits. There is limited evidence of the effectiveness of community-focused information dissemination approaches in influencing participants’ perceptions and uptake of innovations in AIVs to address malnutrition. This article aims to fill this knowledge gap, using a case study focusing on pastoral communities in Monduli district in northern Tanzania. Target communities participated in a community-based nutritional outreach facilitated by the Good Seed Initiative (GSI), held at Monduli district hospital in September 2014. The results provide evidence of the achievements of the GSI intervention, and the effectiveness of alternative information dissemination approaches.  相似文献   
329.
The Organisation for Security and Co-operation in Europe (OSCE) has rarely been considered in scholarship on gender and security, even though it was one of the regional security organisations whose gender policy predated the United Nations Security Council’s call for more international attention to issues related to women, peace and security in October 2000. Based on an analysis of official OSCE documents and on semi-structured interviews, we trace the integration of gender issues in the OSCE and explore the rationale behind and the challenges associated with it. We identify two phases of gender policy change in the OSCE and show how the integration of UNSCR 1325 brought about an expansion of OSCE gender policy from an exclusive focus on “soft” security issues towards increased inclusion of gender in the area of “hard” security. Drawing on historical and feminist institutionalism, we argue that reform coalitions were crucial for the policy changes in the OSCE but that they encountered institutional and ideational barriers, which hampered implementation of the gender policy. In light of rising opposition, our analysis warns of a backlash that might jeopardise current achievements.  相似文献   
330.
The Russian challenge to the European security system is internal rather than external, because despite all the political efforts at distancing Russia from Europe, the indivisibility remains undiminished. The underlying assumption for Russia’s course is that the West is in irreversible decline, and the conclusion about the dissolution of the West-controlled world order is established in the key doctrinal documents. Instead of passively waiting for this meltdown to develop, it makes perfect sense for the Russian leadership to accelerate it pro-actively, using various levers, including military force. Moscow acts on the assumption that its “unconventional” methods could yield results only if augmented by military threats, against which the Europeans cannot master convincing counter-argument. The imperative to sustain and update credibility of these threats necessitates allocation of greater share of available resources to military build-up, which clashes with economic rationale of reducing this burden in the situation of protracted stagnation.  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