全文获取类型
收费全文 | 18874篇 |
免费 | 210篇 |
专业分类
各国政治 | 712篇 |
工人农民 | 836篇 |
世界政治 | 1173篇 |
外交国际关系 | 661篇 |
法律 | 12395篇 |
中国共产党 | 2篇 |
中国政治 | 106篇 |
政治理论 | 3108篇 |
综合类 | 91篇 |
出版年
2023年 | 96篇 |
2021年 | 101篇 |
2020年 | 447篇 |
2019年 | 463篇 |
2018年 | 570篇 |
2017年 | 587篇 |
2016年 | 674篇 |
2015年 | 518篇 |
2014年 | 537篇 |
2013年 | 1835篇 |
2012年 | 494篇 |
2011年 | 518篇 |
2010年 | 543篇 |
2009年 | 570篇 |
2008年 | 519篇 |
2007年 | 508篇 |
2006年 | 531篇 |
2005年 | 442篇 |
2004年 | 441篇 |
2003年 | 369篇 |
2002年 | 418篇 |
2001年 | 682篇 |
2000年 | 610篇 |
1999年 | 493篇 |
1998年 | 245篇 |
1997年 | 177篇 |
1996年 | 200篇 |
1995年 | 202篇 |
1994年 | 177篇 |
1993年 | 188篇 |
1992年 | 310篇 |
1991年 | 314篇 |
1990年 | 304篇 |
1989年 | 285篇 |
1988年 | 310篇 |
1987年 | 267篇 |
1986年 | 326篇 |
1985年 | 321篇 |
1984年 | 251篇 |
1983年 | 235篇 |
1982年 | 179篇 |
1981年 | 162篇 |
1980年 | 145篇 |
1979年 | 223篇 |
1978年 | 118篇 |
1977年 | 94篇 |
1975年 | 98篇 |
1974年 | 129篇 |
1973年 | 80篇 |
1972年 | 80篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
911.
Nicole A. Anderson Amy M. Bohnert Amy Governale 《Journal of youth and adolescence》2018,47(8):1697-1711
Research examining factors that predict youth’s involvement in organized activities is very limited, despite associations with positive outcomes. Using data from 1043 youth (49% female; 46.4% Hispanic, 35.4% African American, 14.0% Caucasian, and 4.2% other) from the Project on Human Development in Chicago Neighborhoods, this study examined how characteristics of parents (supervision, warmth) and neighborhoods (perceived neighborhood safety and collective efficacy) predict patterns of adolescents’ involvement in organized activities concurrently (i.e., intensity) and longitudinally (i.e., type and breadth). Parental supervision predicted adolescents’ participation in organized activities across multiple waves. Neighborhood violence was positively associated with concurrent participation in organized activities after controlling for socioeconomic status (SES), whereas higher neighborhood collective efficacy predicted greater breadth in organized activity participation across time. These findings have important implications regarding how to attract and sustain organized activity participation for low-income, urban youth. 相似文献
912.
Nicole M. Schmidt Marvin D. Krohn Theresa L. Osypuk 《Journal of youth and adolescence》2018,47(10):2009-2026
Residential mobility is one documented stressor contributing to higher delinquency and worse educational outcomes. Sensitive period life course models suggest that certain developmental stages make individuals more susceptible to the effects of an exposure, like residential mobility, on outcomes. However, most prior research is observational, and has not examined heterogeneity across age or gender that may inform sensitive periods, even though it may have important implications for the etiology of adolescent development. Moreover, there are important translational implications for identifying the groups most vulnerable to residential mobility to inform how to buffer adverse effects of moving. In this study, low-income families were randomized to residential mobility out of public housing into lower poverty neighborhoods using a rental subsidy voucher (“experimental voucher condition”), and were compared to control families remaining in public housing. The sample was comprised of 2829 youth (51% female; 62% Non-Hispanic Black, 31% Hispanic, 7% other race). At baseline, youth ranged from 5 to 16 years old. This study hypothesized that random assignment to the housing voucher condition would generate harmful effects on delinquency and educational problems, compared to the control group, among boys who were older at baseline. The results confirmed this hypothesis: random assignment to the experimental voucher condition generating residential mobility caused higher delinquency among boys who were 13–16 years old at baseline, compared to same-age, in-place public housing controls. However, residential mobility did not affect delinquency among girls regardless of age, or among boys who were 5–12 years old at baseline. The pattern of results for educational problems was similar but weaker. Families with teenage boys are particularly vulnerable to residential transitions. Incorporating additional supports into housing programs may help low-income, urban families to successfully transition to lower poverty neighborhoods. 相似文献
913.
RNICE Model: Evaluating the Contribution of Replication Studies in Public Administration and Management Research
下载免费PDF全文

Replication studies relate to the scientific principle of replicability and serve the significant purpose of providing supporting (or contradicting) evidence regarding the existence of a phenomenon. However, replication has never been an integral part of public administration and management research. Recently, scholars have called for more replication, but academic reflections on when replication adds substantive value to public administration and management research are needed. This article presents the RNICE conceptual model, for assessing when and how a replication study contributes knowledge about a social phenomenon and advances knowledge in the public administration and management literatures. The RNICE model provides a vehicle for researchers who seek to evaluate or demonstrate the value of a replication study systematically. The practical application of the model is illustrated using two published replication studies. 相似文献
914.
915.
HESTER M. VAN DE BOVENKAMP MARLEEN DE MUL JULIA G.U. QUARTZ ANNE MARIE J.W.M. WEGGELAAR‐JANSEN ROLAND BAL 《Public administration》2014,92(1):208-223
Since the 1980s, regulated markets and New Public Management have been introduced in the public sector across the world. How they have affected existing governance mechanisms such as self‐regulation and state regulation has remained largely unexplored, however. This article examines the origins and consequences of institutional layering in governing healthcare quality. Dutch health care, where a market‐based system has been introduced, is used as a case study. The results show that this market‐based system did not replace but modified existing institutional arrangements. As a result, hospitals have to deal with the fragmentation of quality demands. Using the concept of institutional layering, this study shows how different arrangements interact. As a consequence, the introduction of a certain policy reform will work out differently in different countries and policy sectors. Our ‘archaeological’ study in this layering can be seen as an example of how such incremental change can be studied in detail. 相似文献
916.
Robert J. Constantine Ross Andel John Robst Eugenia M. Givens 《Journal of youth and adolescence》2013,42(8):1286-1298
This article identifies the arrest trajectories of youth from ages 12 through 24 years old and tests hypotheses derived from Moffitt’s developmental taxonomic theory of crime concerning the impact of various emotional disturbances on the specific trajectories of the youth involved. The study uses exclusively administrative data sets and includes a gender and racially diverse sample of 10,360 youth (30.7 % females) who were arrested at least once between ages 12 and 24 in the early 2000s. Latent class growth analysis was employed in order to identify distinct arrest trajectories of youth in the sample. Multinomial logistic regression was used to identify diagnostic and other characteristics associated with membership in the specific trajectories predicted by Moffitt’s theory. Five trajectory classes were identified, 3 of which were consistent with taxonomic theory including high and classic adolescence limited trajectory classes and a “snared adolescence limited class” described more recently by Moffitt. The distribution of youth among the 5 classes was very different for those with and without emotional disturbances. Youth with emotional disturbances in their late adolescent years were more likely to fall into the high arrest trajectory class and much less likely to fall into the low arrest trajectory class. Compared to youth without an emotional disturbance, youth with psychotic disorders were more than twice as likely to fall into the high as into the low arrest trajectory class. Youth with disruptive behavior disorders were more than twice as likely to fall into the high and intermediate classes as into the low trajectory class. Anxiety and depressive disorders were not associated with significantly greater likelihood of falling into any one of the trajectory classes. Youth in the snared adolescence limited class were more likely than those in the classic adolescence limited class to be male, black versus white and in the foster care enrollment category lending some support to Moffitt’s conceptualization of this class as an adolescence limited class composed of youth who are snared by involvement in the criminal justice and or social services systems. Implications of these results for public policy and the study of adolescence are discussed. 相似文献
917.
Having an adult mentor during adolescence has been found to predict academic success. Building on previous work, the present study examined interactions between the type of mentor (i.e., kin, teacher, friend, or community), the time that mentor became important (i.e., before, during, or after high school), and the ethnicity of the protégé in predicting educational attainment in young adulthood. Analyses used Waves III and IV of the National Longitudinal Study of Adolescent Health (N = 2,409). Participants’ ages ranged from 18 to 27 (M = 21.75, SD = 1.79). The sample was 56.7 % female and nationally representative of ethnic diversity. Analyses showed that having a teacher-mentor was more predictive of educational attainment than having other types of mentors and that overall, having a mentor after high school predicts the most educational attainment. Kin- and community-mentors appeared to be more important to educational attainment during and before high school, respectively. Findings were consistent across ethnic groups. Overall, results highlight the value of teacher-mentors throughout childhood, adolescence, and early adulthood and our study further suggests that different types of mentors may be particularly useful at specific points in development. 相似文献
918.
The Perpetration of Intimate Partner Violence among LGBTQ College Youth: The Role of Minority Stress
Preliminary research suggests that partner violence is a problem among lesbian, gay, bisexual, transgender, queer, and questioning (LGBTQ) college youth. However, there is no study to date with college youth on the factors associated with perpetration of same-sex partner violence, which is needed to inform prevention efforts specific to this population. Thus, the purpose of the current study was to assess how facets of minority stress (i.e., sexual-orientation-related victimization, sexual minority stigma, internalized homonegativity, sexual identity concealment) relate to physical, sexual, and psychological partner violence perpetration among LGBTQ college youth (N = 391; 49 % identified as men; 72 % Caucasian; M age: 20.77 years). At the bivariate level, physical perpetration was related to identity concealment and internalized homonegativity; sexual perpetration was related to internalized homonegativity; and psychological perpetration was related to sexual-orientation-related victimization. However, at the multivariate level (after controlling for concurrent victimization), psychological perpetration was unrelated to minority stress variables, whereas physical and sexual perpetration were both related to internalized homonegativity; physical perpetration was also related to identity concealment. These results underscore the utility of understanding partner violence among LGBTQ youth through a minority stress framework. Moreover, the current study highlights the need for a better understanding of factors that mediate and moderate the relationship between minority stress and partner violence perpetration among LGBTQ youth in order to inform prevention and intervention efforts. 相似文献
919.
920.