全文获取类型
收费全文 | 241篇 |
免费 | 13篇 |
专业分类
各国政治 | 23篇 |
工人农民 | 1篇 |
世界政治 | 19篇 |
外交国际关系 | 6篇 |
法律 | 165篇 |
中国共产党 | 1篇 |
中国政治 | 2篇 |
政治理论 | 35篇 |
综合类 | 2篇 |
出版年
2023年 | 6篇 |
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 10篇 |
2019年 | 14篇 |
2018年 | 13篇 |
2017年 | 11篇 |
2016年 | 15篇 |
2015年 | 6篇 |
2014年 | 7篇 |
2013年 | 23篇 |
2012年 | 8篇 |
2011年 | 17篇 |
2010年 | 4篇 |
2009年 | 14篇 |
2008年 | 10篇 |
2007年 | 6篇 |
2006年 | 5篇 |
2005年 | 7篇 |
2004年 | 9篇 |
2003年 | 12篇 |
2002年 | 12篇 |
2001年 | 6篇 |
2000年 | 9篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1994年 | 3篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 4篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1986年 | 1篇 |
1984年 | 1篇 |
1980年 | 1篇 |
1969年 | 2篇 |
1968年 | 1篇 |
1964年 | 1篇 |
排序方式: 共有254条查询结果,搜索用时 15 毫秒
161.
De Leon Petta Gomes da Costa 《Astropolitics》2016,14(1):90-98
With the Obama Administration’s foreign policy pivot to Asia, the Chinese government is concerned about the possibility of new challenges in their foreign policy sphere of influence. Since the 1990s, many political and military analysts have explored the eventual rivalry between these two states. However, events in the Middle East preoccupy U.S. attention, leaving China moderately free in Southeast Asia, though it is uncertain for how long this will persist and if the United States will reallocate its attention to contain China. In this case, the Chinese government will need to develop countermeasures to sustain its geopolitical interests. There are two focuses in this analysis: (1) the Chinese geopolitical naval situation, exploring the problems in the geosphere surrounding China and the eventual competition with other regional powers and the United States in East Asia; and (2) the potential for space program cooperation with Russia and Brazil, which, in turn, dramatically changes the balance of power in outer space through positive aspects of Russian technical capabilities and strategic Brazilian geographic (Alcântara launch site). 相似文献
162.
163.
164.
165.
Norberto Ribeiro Carla Malafaia Maria Fernandes-Jesus Tiago Neves 《Journal of Civil Society》2014,10(1):51-68
AbstractThis article aims to compare discourses about national and European policies on active citizenship and democratic participation, with a particular focus on youth and migrants. For this purpose we analysed official documents of public institutions and nongovernmental organizations (NGOs) in order to assess how the process of Europeanization has influenced national policies with regard to increasing political participation and citizens' civic awareness. Additionally, we conducted interviews with policy makers and NGO leaders in order to integrate and compare different levels of discourse and thus identify potential dissonances. Analysis of the documents shows that there is a strong concern to match national policy priorities with those established by international organizations. Notwithstanding positive perceptions, NGO leaders and policy makers criticize the ways policies have been implemented, stressing the need to adopt a strategy that bridges the gap between the prescribed and the real, as well as the importance of overcoming the hegemony of economic factors in policy decisions. In this regard, NGO leaders criticize the cynicism of political leaders and policies motivated by demographic and economic concerns. In relation to European identity and integration, NGO leaders argue that Europe must be collectively constructed; yet, policy makers stress that the failure of the Constitutional Treaty in 2005 resulted from a deficit in the negotiation process. In sum, this article suggests that it is necessary to promote greater involvement of civil society in the design and implementation of policies which, in turn, may contribute to the strengthening of shared democratic principles. 相似文献
166.
167.
168.
Near Infrared Spectroscopy Detection and Quantification of Herbal Medicines Adulterated with Sibutramine
下载免费PDF全文
![点击此处可从《Journal of forensic sciences》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Neirivaldo Cavalcante da Silva M.Sc. Ricardo Saldanha Honorato Ph.D. Maria Fernanda Pimentel Ph.D. Salvador Garrigues Ph.D. Maria Luisa Cervera Ph.D. Miguel de la Guardia Ph.D. 《Journal of forensic sciences》2015,60(5):1199-1205
There is an increasing demand for herbal medicines in weight loss treatment. Some synthetic chemicals, such as sibutramine (SB), have been detected as adulterants in herbal formulations. In this study, two strategies using near infrared (NIR) spectroscopy have been developed to evaluate potential adulteration of herbal medicines with SB: a qualitative screening approach and a quantitative methodology based on multivariate calibration. Samples were composed by products commercialized as herbal medicines, as well as by laboratory adulterated samples. Spectra were obtained in the range of 14,000–4000 per cm. Using PLS‐DA, a correct classification of 100% was achieved for the external validation set. In the quantitative approach, the root mean squares error of prediction (RMSEP), for both PLS and MLR models, was 0.2%w/w. The results prove the potential of NIR spectroscopy and multivariate calibration in quantifying sibutramine in adulterated herbal medicines samples. 相似文献
169.
Jorge Borrani Martha Frías Xóchitl Ortiz Aída García 《The journal of forensic psychiatry & psychology》2015,26(1):60-77
Executive functions are still developing during adolescence. It is important to analyse if juvenile delinquency is related to a delay in the development of these functions. The objective of this study was to analyse cognitive inhibition and flexibility, two components of executive functions, in juvenile delinquents. Participants were 81 males, 17.46 ± 1.60 years old. Three groups were compared: a juvenile delinquent inmate group (IG), an age-paired group (APG), and an age- and education-paired group (AEPG). A modified Stroop task was used to assess cognitive inhibition and flexibility. The IG and the AEPG (low-education adolescents) had significantly more difficulties than the APG on inhibition; the IG and the AEPG had no significant differences. No group differences were found on flexibility. Since all low-education adolescents have difficulties on inhibition, these difficulties are not an exclusive characteristic of juvenile delinquents. Analysis of cognitive processes in juvenile delinquents must control for education to determine how specific are the difficulties found in these adolescents. 相似文献
170.
This research note revisits the theme of “the cost of not being white in Brazil.” Based on 1996 National Household Survey
(PNAD) data, the results point out to still sizeable and significant monetary disadvantages suffered by nonwhites in the Brazilian
labor market. It is estimated that about 18 percent of the white-nonwhite income gap can be attributed to differential rates
of return to human capital investments and to other individual characteristics between the race/color groups.
Nelson do Valle Silva is Researcher at Laboratorio Nacional de Computacao Cientifica and Professor at Instituto Universitario
de Pesquisas do Rio de Janeiro. His most recent books areMobilidade Social no Brasil, Sao Paulo: Makron Books, 1999 (with J. Pastore) andCor e Estratificacao Social no Brasil Rio: Contracapa, 1999 (with C. Hasenbalg and M. Lima). He received his Ph.D. in Sociology from the University of Michigan. 相似文献