全文获取类型
收费全文 | 24247篇 |
免费 | 1383篇 |
专业分类
各国政治 | 1071篇 |
工人农民 | 1027篇 |
世界政治 | 1630篇 |
外交国际关系 | 799篇 |
法律 | 16586篇 |
中国共产党 | 9篇 |
中国政治 | 153篇 |
政治理论 | 4221篇 |
综合类 | 134篇 |
出版年
2021年 | 134篇 |
2020年 | 507篇 |
2019年 | 550篇 |
2018年 | 734篇 |
2017年 | 757篇 |
2016年 | 857篇 |
2015年 | 627篇 |
2014年 | 682篇 |
2013年 | 2464篇 |
2012年 | 658篇 |
2011年 | 697篇 |
2010年 | 695篇 |
2009年 | 733篇 |
2008年 | 727篇 |
2007年 | 770篇 |
2006年 | 759篇 |
2005年 | 609篇 |
2004年 | 617篇 |
2003年 | 559篇 |
2002年 | 577篇 |
2001年 | 919篇 |
2000年 | 830篇 |
1999年 | 659篇 |
1998年 | 320篇 |
1997年 | 240篇 |
1996年 | 268篇 |
1995年 | 250篇 |
1994年 | 239篇 |
1993年 | 231篇 |
1992年 | 432篇 |
1991年 | 438篇 |
1990年 | 407篇 |
1989年 | 409篇 |
1988年 | 420篇 |
1987年 | 384篇 |
1986年 | 434篇 |
1985年 | 437篇 |
1984年 | 342篇 |
1983年 | 342篇 |
1982年 | 260篇 |
1981年 | 242篇 |
1980年 | 201篇 |
1979年 | 294篇 |
1978年 | 179篇 |
1977年 | 148篇 |
1976年 | 125篇 |
1975年 | 130篇 |
1974年 | 177篇 |
1973年 | 137篇 |
1971年 | 112篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
871.
AbstractThis article explores the heterogeneous effects of the migration–remittance process on the educational attainment of Nepalese children. The results suggest that when controlling for remittances, the children of more educated or informed parents suffer from parental absence, while the children of less informed parents gain from migration, implying that the migration experience helps less educated parents estimate the value of and returns to education more precisely. The results also suggest that remittances help severely credit-constrained households enrol their children in school and prevent dropouts. These remittances help households that face less severe liquidity constraints increase their investment in quality education. 相似文献
872.
873.
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
874.
875.
876.
877.
878.
Tanya M. Kerssen 《The Journal of peasant studies》2013,40(5):1047-1050
ABSTRACTExtensive research, mainly undertaken by nutrition scientists and economists, indicates that the presence of a home garden is positively associated with improved household nutrition in rural households of the global South. However, this literature is relatively silent on the contexts that influence home garden uptake. This is problematic given rapidly changing social and economic landscapes, which reshape the place and scope for home gardens within households’ livelihood and food provisioning arrangements. Original research from Myanmar reported here reveals that emergent socio-economic contexts for rural households are posing heightened challenges for home gardens to contribute to food and nutrition security. 相似文献
879.
880.
Caroline W. Kabiru Donatien Beguy Robert P. Ndugwa Eliya M. Zulu Richard Jessor 《Child & Youth Services》2013,34(1):12-32
Many adolescents living in contexts characterized by adversity achieve positive outcomes. We adopt a protection–risk conceptual framework to examine resilience (academic achievement, civic participation, and avoidance of risk behaviors) among 1,722 never-married 12–19 year olds living in two Kenyan urban slums. We find stronger associations between explanatory factors and resilience among older (15–19 years) than younger (12–14 years) adolescents. Models for prosocial behavior and models for antisocial behavior emerge as key predictors of resilience. Further accumulation of evidence on risk and protective factors is needed to inform interventions to promote positive outcomes among youth situated in an ecology of adversity. 相似文献