全文获取类型
收费全文 | 1990篇 |
免费 | 84篇 |
专业分类
各国政治 | 172篇 |
工人农民 | 156篇 |
世界政治 | 133篇 |
外交国际关系 | 114篇 |
法律 | 1008篇 |
中国政治 | 12篇 |
政治理论 | 475篇 |
综合类 | 4篇 |
出版年
2023年 | 16篇 |
2022年 | 19篇 |
2021年 | 30篇 |
2020年 | 59篇 |
2019年 | 70篇 |
2018年 | 99篇 |
2017年 | 108篇 |
2016年 | 105篇 |
2015年 | 96篇 |
2014年 | 84篇 |
2013年 | 291篇 |
2012年 | 136篇 |
2011年 | 113篇 |
2010年 | 63篇 |
2009年 | 74篇 |
2008年 | 82篇 |
2007年 | 99篇 |
2006年 | 57篇 |
2005年 | 50篇 |
2004年 | 45篇 |
2003年 | 39篇 |
2002年 | 51篇 |
2001年 | 32篇 |
2000年 | 40篇 |
1999年 | 25篇 |
1998年 | 13篇 |
1997年 | 9篇 |
1996年 | 16篇 |
1995年 | 9篇 |
1994年 | 6篇 |
1993年 | 7篇 |
1992年 | 11篇 |
1991年 | 8篇 |
1990年 | 8篇 |
1989年 | 6篇 |
1986年 | 6篇 |
1984年 | 8篇 |
1983年 | 9篇 |
1982年 | 7篇 |
1979年 | 8篇 |
1978年 | 5篇 |
1974年 | 3篇 |
1973年 | 4篇 |
1972年 | 3篇 |
1970年 | 4篇 |
1967年 | 3篇 |
1966年 | 3篇 |
1965年 | 3篇 |
1958年 | 3篇 |
1957年 | 3篇 |
排序方式: 共有2074条查询结果,搜索用时 15 毫秒
71.
Markus Kröger 《The Journal of peasant studies》2016,43(4):886-909
With the rise of ‘bioeconomy’, trees are receiving increasing attention. This contribution conducts a preliminary analysis of the trajectories and the main drivers of change in the rise of new, flexible and multiple uses of trees. It assesses the political dimensions involved in this transformation, which is simultaneously ongoing, anticipated and imagined. Notes are offered on the issues to be considered when the flex-crop framework is operationalized to include the study of trees, and additional conceptualizations that help in analyzing the political economy of tree uses are provided. Areas needing further empirical study are identified and a preliminary research agenda is suggested. The flexible and multiple use of trees and tree-derived commodities is having a large impact on power relations in the global political economy of forestry and the forest industry, the asymmetry of which is based on who is best able to flex or de-multiply, thereby controlling commodity webs and processing technology. It is argued that while flexing seems to increase diversity, in practice it typically increases this only for the processing industry; the converse occurs in terms of the unification of the productive base into monocultures. However, these two processes go hand in hand, and illustrate how flexing is a deeply capitalist process. 相似文献
72.
73.
74.
Although there is considerable evidence for the hypothesis that an efficient use of management techniques is the key to a good public service delivery, a lot of studies come to the conclusion that there is only partial, reluctant implementation or even a general lack of the use of such techniques by public managers. This paper examines the determinants for the use of quality management techniques in public sector organizations from six EU countries. It turns out that especially more organizational autonomy and result control appear to be of importance while, surprisingly, the combination of these variables leads to negative results. 相似文献
75.
Everyday interactions with same-racial/ethnic others may confer positive benefits for adolescents, but the meaning of these interactions are likely influenced by individual differences and larger structural contexts. This study examined the situation-level association between contact with same-ethnic others and anxiety symptoms among a diverse sample of 306 racial/ethnic minority adolescents (Mage = 14 years; 66 % female), based on (1) individual differences in ethnic identity centrality and (2) developmental histories of transitions in diversity between elementary, middle, and high school. The results indicated that at the level of the situation, when adolescents interacted with more same-ethnic others, they reported fewer anxiety symptoms. Further, for adolescents who had experienced a transition in school diversity, the positive benefits of contact with same-ethnic others was only conferred for those who felt that their ethnicity was very important to them. The importance of examining individual differences within larger developmental histories to understand the everyday experiences of ethnic minority adolescents are discussed. 相似文献
76.
77.
Drew M. Anderson Katharine M. Broton Sara Goldrick-Rab Robert Kelchen 《Journal of policy analysis and management》2020,39(3):720-739
We conduct the first long-term experimental evaluation of a need-based financial aid program, the privately funded Wisconsin Scholars Grant. Over multiple cohorts, the program failed to increase degree completion and graduate school enrollment up to 10 years after matriculation. The program did reduce time-to-degree for some students and modestly increased the number of STEM degrees earned. The lack of robust effects raises important questions about the conditions necessary for financial aid to benefit students. 相似文献
78.
Against a backdrop of increased levels of marketization of welfare services in OECD countries, this article aims to shed light on the separate effects of private ownership and competition for the market on service quality. Using residential elder care homes in Sweden as our case, we leverage unique panel data of ownership and competition against a set of indicators, pertaining to the structure, process, and outcome dimensions of care quality. The main finding of our analyses is that competition for the market does surprisingly little for quality: private entrepreneurs perform neither better nor worse under stiff competition and the quality of care is approximately the same in those nursing homes that are exposed to the market as in those that are not. 相似文献
79.
Cristiane Barbosa D'Oliveira Matielo M.S. Rafael Plá Matielo Lemos Ph.D. Deise Schröder Sarzi M.S. Lilian de Oliveira Machado Ph.D. Dalvan Carlos Beise Bac. Priscila Caroline Thiago Dobbler M.S. Renata Machado Castro Bac. Mauro Sander Fett Ph.D. Luiz Fernando Würdig Roesch Ph.D. Flávio Anastácio de Oliveira Camargo Ph.D. Valdir Marcos Stefenon Ph.D. 《Journal of forensic sciences》2020,65(1):259-265
DNA is one of the fastest growing tools in forensic sciences, increasing reliability in forensic reports and judgments. The use of DNA has increased in different areas of the forensic sciences, such as investigation of plant species, where plastid DNA has been used to elucidate and generate evidence in cases of traceability of genetically modified and controlled plants. Even with several advances and the practice of using DNA in forensic investigations, there are just few studies related to the identification of genetic tools for the characterization of drug and nondrug-types of Cannabis. Herein, the whole plastomes of two drug-type Cannabis are presented and have their structures compared with other Cannabis plastomes deposited in the GenBank, focusing in the forensic use of plastome sequences. The plastomes of Cannabis sativa “Brazuka” and of the hybrid Cannabis AK Royal Automatic presented general structure that does not differs from the reported for other C. sativa cultivars. A phylogenomic analyses grouped C. sativa “Brazuka” with the nondrug C. sativa cultivars, while the hybrid Cannabis AK Royal Automatic placed isolated, basal to this group. This suggests that the analysis of plastomes is useful toward genetic identification of hybrids in relation to C. sativa. 相似文献
80.
Public Choice - Causal inference and American political development (APD) are widely separated and (to some) fundamentally incompatible tendencies within political science. In this paper, we... 相似文献