全文获取类型
收费全文 | 1700篇 |
免费 | 113篇 |
专业分类
各国政治 | 165篇 |
工人农民 | 109篇 |
世界政治 | 179篇 |
外交国际关系 | 112篇 |
法律 | 884篇 |
中国共产党 | 2篇 |
中国政治 | 34篇 |
政治理论 | 293篇 |
综合类 | 35篇 |
出版年
2023年 | 23篇 |
2022年 | 18篇 |
2021年 | 39篇 |
2020年 | 54篇 |
2019年 | 65篇 |
2018年 | 99篇 |
2017年 | 137篇 |
2016年 | 104篇 |
2015年 | 76篇 |
2014年 | 89篇 |
2013年 | 242篇 |
2012年 | 75篇 |
2011年 | 68篇 |
2010年 | 39篇 |
2009年 | 39篇 |
2008年 | 69篇 |
2007年 | 68篇 |
2006年 | 62篇 |
2005年 | 62篇 |
2004年 | 62篇 |
2003年 | 65篇 |
2002年 | 57篇 |
2001年 | 41篇 |
2000年 | 28篇 |
1999年 | 18篇 |
1998年 | 12篇 |
1997年 | 17篇 |
1996年 | 5篇 |
1995年 | 8篇 |
1994年 | 4篇 |
1993年 | 5篇 |
1992年 | 8篇 |
1991年 | 6篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 5篇 |
1987年 | 3篇 |
1985年 | 3篇 |
1983年 | 2篇 |
1982年 | 5篇 |
1978年 | 3篇 |
1974年 | 2篇 |
1972年 | 2篇 |
1971年 | 3篇 |
1970年 | 1篇 |
1968年 | 4篇 |
1967年 | 2篇 |
1966年 | 3篇 |
1965年 | 1篇 |
1964年 | 1篇 |
排序方式: 共有1813条查询结果,搜索用时 15 毫秒
991.
Reyes JC Robles RR Colón HM Negrón J Matos TD Calderón J Pérez OM 《Journal of interpersonal violence》2008,23(11):1499-1512
This study investigates the role of neighborhoods in adolescent violence in poor neighborhoods in San Juan, Puerto Rico. The study is part of a larger longitudinal project examining risk and resilience in adolescents' ages 12 to 15 years old and their caregivers. Using a cross-sectional design, a self-completion questionnaire, and an interviewer questionnaire, the authors assessed violent behaviors among participants across demographics, characteristics, and neighborhood social disorganization using the concepts of physical disorders and social disorder. Adolescent violence was positively associated with social disorder. The finding that adults in these neighborhoods walk around with visible firearms and engage in fighting, may have led adolescents to perceive that violence is an accepted behavior. Furthermore, socially disorganized neighborhoods might be less likely to organize on their own behalf because the occurrence of negative experience limits the amount of social support and resources that are available in the neighborhood. 相似文献
992.
Characterization of lesions in hanging deaths 总被引:1,自引:0,他引:1
Suárez-Peñaranda JM Alvarez T Miguéns X Rodríguez-Calvo MS de Abajo BL Cortesão M Cordeiro C Vieira DN Muñoz JI 《Journal of forensic sciences》2008,53(3):720-723
Hanging is a common method of committing suicide and a routine task in medico-legal autopsies. The hanging mark is the most relevant external sign and its characteristics are well known, but, for unknown reasons, there are major differences in reports on internal findings. We retrospectively studied 228 consecutive cases of hanging deaths. A complete standard autopsy was performed for every case. We investigated the association between the characteristics of the hanging mark and the frequency of bone, cartilage, soft tissue, and vascular injuries with the mode of suspension. Most cases (75.3%) presented some kind of bone or cartilage fracture, but these were unrelated to any of the variables studied. Vascular lesions are clearly more infrequent: intimal injuries were found in the carotid artery (9.1%), the jugular vein (2.2%), and ruptures of the carotid adventitial layer (21.7%). These could be partially associated with the use of a hard fixed noose and body weight. 相似文献
993.
González-Andrade F Sánchez D Martínez-Jarreta B Budowle B 《Journal of forensic sciences》2008,53(2):512-514
POPULATIONS: Over 102 unrelated Mestizos, 102 Native Amerindian (Kichwas), and 102 African Americans who represent the three largest communities of the country Ecuador (South America). 相似文献
994.
Juan Dios de Montoro Pons Manuel Cuadrado García 《European Journal of Law and Economics》2008,26(2):153-173
This article aims at identifying differences in copyright protection in prerecorded music markets, and more specifically the
impact of the legal system on the demand for original music CDs. To this end, we use a panel of 28 OECD countries in the period
1999–2005. After testing alternative specifications, our results show that differences in legal origin lead to differences
in intellectual property rights enforcement. Our results also consistent with previous studies that find that common law countries
have more secure property rights.
相似文献
Juan Dios de Montoro PonsEmail: |
995.
Government strategies to attract R&D-intensive FDI 总被引:1,自引:0,他引:1
José Guimón 《The Journal of Technology Transfer》2009,34(4):364-379
Competition among countries to attract the research and development (R&D) activities of multinational enterprises has increased
substantially during the last years, but the strategies used by governments in this competition still remain largely unexplored.
This paper addresses that gap by proposing a taxonomy of the policy instruments available to stimulate inward R&D-intensive
foreign direct investment (FDI) and presenting the results of a comparative case study of two EU countries: Spain and Ireland.
The main conclusion is that an efficient promotion of R&D-intensive FDI calls for a closer connection between innovation policy
and inward investment promotion, which are two policy areas that have traditionally operated rather separately. In addition,
investment promotion agencies targeting R&D-intensive FDI are advised to reconfigure the scope of services they provide by
placing more emphasis on after-care, since R&D-intensive FDI tends to be evolutionary rather than purely greenfield.
相似文献
José GuimónEmail: |
996.
Marina Aliste M.Sc. Sandra Arranz M.Sc. Alicia Sánchez-Ortega Ph.D. M. Carmen Sampedro Ph.D. Nora Unceta Ph.D. Alberto Gómez-Caballero Ph.D. Asier Vallejo Ph.D. Maria Aranzazu Goicolea Ph.D. Ramón J. Barrio Ph.D. 《Journal of forensic sciences》2020,65(4):1094-1101
Currently, aluminum stub with carbon adhesive devices are used to collect inorganic gunshot residues (GSR) from the hands of a shooter. In an ideal shooting case, the gunshot particles do not persist for more than 2 h in the hands of the shooter, provided that the hands have not been washed. However, for forensic analysis and inference, the extended persistence of GSR would be desirable. This study investigates a novel GSR sampling and detection protocol. Sampling was performed in the nostrils using swab devices impregnated in ethylenediaminetetraacetic acid (EDTA). The GSRs persisted for longer periods in nasal mucus than on the hands, and particles were detected 6 h after shooting occurred. The analytical determination was conducted by scanning laser ablation-inductively coupled plasma-mass spectrometry (SLA-ICPMS) which enable the identification of the number of particles and their elemental composition. Seventeen isotope signals corresponding to 13C, 205Tl and 15 analytes that are usually associated with the composition of GSR residues were monitored: 27Al, 29Si, 31P, 33S, 35Cl, 39K, 44Ca, 57Fe, 60Ni, 63Cu, 66Zn, 118Sn, 121Sb, 137Ba, and 208Pb. The SLA technique enabled the reduction of the swab analysis time to 40 min. The effectiveness of this methodology was evaluated with two types of firearms: a pistol and a shotgun. The results indicated that the methodology proposed for the analysis of the nasal GSR was effective and that it can improve or complement the forensic analyses and inferences presented in a court. 相似文献
997.
Azagra-Caro Joaquín M. Fernández-Mesa Anabel Robinson-García Nicolás 《The Journal of Technology Transfer》2020,45(1):56-85
The Journal of Technology Transfer - Some scientists write literary fiction books in their spare time. If these books contain scientific knowledge, literary fiction becomes a mechanism of knowledge... 相似文献
998.
The Journal of Technology Transfer - This paper studies the innovation productivity of academic researchers across their career advancement. Taking patents and invention disclosures as indicators... 相似文献
999.
Policy Sciences - The ‘Social Construction Framework’ which addresses the relationship between policy design and the construction of target groups is one of the central approaches... 相似文献
1000.
ABSTRACT This paper shows that the role of national electoral dynamics on regional elections is highly mediated by institutional and electoral constraints at the regional level. Using data on statewide parties’ electoral competition in regional and national elections in Spain and Italy, results show that the contamination of regional elections is lower in regions where decentralization has travelled further and where strong regionalist parties dominate electoral competition. The paper also shows that these two channels -more regional authority and more regionalist competition- shape the regional manifestos of statewide parties by increasing their pro-regional positions. These findings represent a contribution to a better understanding of the extent to which regional elections are a separate electoral arena from the national one. 相似文献