全文获取类型
收费全文 | 1969篇 |
免费 | 108篇 |
专业分类
各国政治 | 170篇 |
工人农民 | 117篇 |
世界政治 | 235篇 |
外交国际关系 | 145篇 |
法律 | 1035篇 |
中国政治 | 5篇 |
政治理论 | 355篇 |
综合类 | 15篇 |
出版年
2023年 | 25篇 |
2022年 | 18篇 |
2021年 | 36篇 |
2020年 | 65篇 |
2019年 | 93篇 |
2018年 | 116篇 |
2017年 | 136篇 |
2016年 | 125篇 |
2015年 | 86篇 |
2014年 | 119篇 |
2013年 | 346篇 |
2012年 | 106篇 |
2011年 | 85篇 |
2010年 | 54篇 |
2009年 | 43篇 |
2008年 | 75篇 |
2007年 | 87篇 |
2006年 | 64篇 |
2005年 | 43篇 |
2004年 | 63篇 |
2003年 | 42篇 |
2002年 | 30篇 |
2001年 | 30篇 |
2000年 | 31篇 |
1999年 | 17篇 |
1998年 | 17篇 |
1997年 | 10篇 |
1996年 | 7篇 |
1995年 | 13篇 |
1994年 | 8篇 |
1993年 | 11篇 |
1992年 | 6篇 |
1991年 | 7篇 |
1990年 | 6篇 |
1989年 | 3篇 |
1987年 | 6篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1984年 | 6篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1975年 | 2篇 |
1974年 | 4篇 |
1972年 | 4篇 |
1971年 | 2篇 |
1967年 | 3篇 |
1966年 | 2篇 |
1965年 | 2篇 |
排序方式: 共有2077条查询结果,搜索用时 0 毫秒
991.
Alan Bennett Freddy Jiménez Larry Eugene Fields Joshua Oyster 《Journal of Law and the Biosciences》2015,2(2):168-212
The US Food and Drug Administration''s (‘FDA’ or the ‘Agency’) current regulatory framework for drug promotion, by significantly restricting the ability of drug manufacturers to communicate important, accurate, up-to-date scientific information about their products that is truthful and non-misleading, runs afoul of the First Amendment and actually runs counter to the Agency''s public health mission. Our article proposes a New Model that represents an initial proposal for a modern, sustainable regulatory framework that comprehensively addresses drug promotion while protecting the public health, protecting manufacturers’ First Amendment rights, establishing clear and understandable rules, and maintaining the integrity of the FDA approval process. The New Model would create three categories of manufacturer communications—(1) Scientific Exchange and Other Exempt Communications, (2) Non-Core Communications, and (3) Core Communications—that would be regulated consistent with the First Amendment and according to the strength of the government''s interest in regulating the specific communications included within each category. The New Model should address the FDA''s concerns related to off-label speech while protecting drug manufacturers’ freedom to engage in truthful and non-misleading communications about their products. 相似文献
992.
Espérance Zossou Davo Simplice Vodouhe Paul Van Mele Afiavi Rita Agboh-Noameshie Philippe Lebailly 《Development in Practice》2015,25(7):1057-1066
In a context of low literacy rates and a high level of rurality, the use of rural radio in agricultural extension is a method that can bridge the gap that exists between researchers, extension workers, and farmers. This article examines the level of farmers’ access to rural radio in relation to gender and livelihoods. The study was conducted in Benin with 18 rural radio stations and 240 rice processors, using the sustainable livelihoods framework to examine the relationship between access to rural radio and livelihoods. Although the study cannot draw conclusions on causal relationships, rice processors who often listened to agricultural broadcasts had better social, financial, and human capital stocks compared to those who did not. Despite the efforts of 72% of the radio stations to link up with extension services, half of the rice processors rarely or never listened to agricultural broadcasts, because the timing of the broadcasts was inappropriate. Interactive radio sessions with farmers that involve government officials will need to address this if they are to become more effective. 相似文献
993.
Sébastien Rioux 《Global Society》2015,29(4):481-509
The uneven and combined development (U&CD) approach in International Relations (IR) claims to offer a solution to the question of “the international” with a single, coherent theory capable of uniting both sociological and geopolitical factors in the explanation of social change. The approach thus claims to provide what IR theorists have long been searching for: a social theory of the international. While acknowledging the importance of this research programme to the field of IR scholarship, this article argues that the U&CD approach takes for granted what needs to be theorised, failing to provide the theoretical solution to the “domestic analogy” problem it so powerfully identifies. 相似文献
994.
Marie Barbesier M.D. Catherine Boval M.D. Jacques Desfeux M.D. Catherine Lebreton M.D. Georges Léonetti M.D. Ph.D. Marie‐Dominique Piercecchi M.D. Ph.D. 《Journal of forensic sciences》2015,60(1):233-235
Coronary artery injury such as acute coronary dissection is an uncommon and potentially life‐threatening complication after blunt chest trauma. The authors report an unusual autopsy case of a 43‐year‐old healthy man who suddenly collapsed after receiving a punch to the chest during the practice of kung fu. The occurrence of the punch was supported by the presence of one recent contusion on the left lateral chest area at the external examination and by areas of hemorrhage next to the left lateral intercostal spaces at the internal examination. The histological examination revealed the presence of an acute dissection of the proximal segment of the left anterior descending coronary artery. Only few cases of coronary artery dissection have been reported due to trauma during sports activities such as rugby and soccer games, but never during the practice of martial arts, sports usually considered as safe and responsible for only minor trauma. 相似文献
995.
Kristin Norell Ph.D. Klas Brorsson Läthén M.Sc. Peter Bergström Ph.D. Allyson Rice B.S. B.A. Vaidehi Natu Ph.D. Alice O'Toole Ph.D. 《Journal of forensic sciences》2015,60(2):331-340
Images of perpetrators in surveillance video footage are often used as evidence in court. In this study, identification accuracy was compared for forensic experts and untrained persons in facial image comparisons as well as the impact of image quality. Participants viewed thirty image pairs and were asked to rate the level of support garnered from their observations for concluding whether or not the two images showed the same person. Forensic experts reached their conclusions with significantly fewer errors than did untrained participants. They were also better than novices at determining when two high‐quality images depicted the same person. Notably, lower image quality led to more careful conclusions by experts, but not for untrained participants. In summary, the untrained participants had more false negatives and false positives than experts, which in the latter case could lead to a higher risk of an innocent person being convicted for an untrained witness. 相似文献
996.
Ontogeny of Size and Shape Sexual Dimorphism in the Pubis: A Multislice Computed Tomography Study by Geometric Morphometry 下载免费PDF全文
Marie Faruch Bilfeld M.D. Ph.D. Fabrice Dedouit M.D. Ph.D. Nicolas Sans M.D. Ph.D. Hervé Rousseau M.D. Ph.D. Daniel Rougé M.D. Ph.D. Norbert Telmon M.D. Ph.D. 《Journal of forensic sciences》2015,60(5):1121-1128
Few studies have been conducted to determine sex differences in the immature coxal bone and the results were often contradictory. The authors studied sexual dimorphic differences of the pubis using geometric morphometric analysis of five osteometric landmarks recorded by multislice computed tomography (MSCT), based on three‐dimensional reconstructions of 188 children (95 boys, 93 girls) living in the region of Toulouse, southwestern France, ranging in age from 1 to 18 years old. They used geometric morphometric methodology first to test sexual dimorphism in size (centroid size) and shape (Procrustes residuals) and second to examine patterns of shape change with age (development) and size change with age (growth). Based on statistical significance test results, the pubic shape became sexually dimorphic at 13 years old, although visible shape differences were observed as early as 9 years old. This work showed that the trajectories of pubis shape (development) and size (growth) differed throughout ontogeny and between sexes. 相似文献
997.
998.
A Rigorous Quasi‐Experimental Design to Evaluate the Causal Effect of a Mandatory Divorce Education Program 下载免费PDF全文
All couples with minor children who filed for divorce within a specific 6‐week period (N = 191 couples) in one jurisdiction were ordered to attend a divorce education program. The control group included about 20 couples randomly selected from each of six 6‐week intervals before and six 6‐week intervals after the treatment interval (N = 243 couples). Archival records were searched for variables such as legal and residential custody award, visitation percentage, and relitigation. The impact of the program was assessed by evaluating, for each variable, whether the data for program interval departed from the straight (regression) line drawn through all the control group intervals. Only the visitation time award significantly differed: 27.75% for treatment couples and 22.46% for control couples. Analyses show that the father's attendance at the program primarily accounts for the difference.
- Key Points for the Family Court Community
- There are considerable methodological weaknesses in most of the existing evaluations of divorcing parent education programs.
- Stronger, more scientifically rigorous—and thus persuasive—designs are possible in court settings, such as the regression discontinuity quasi‐experimental design we feature here.
- Archival records, such as various court filings, are a rich and relatively untapped source of data.
- Being mandated to attend a single 2‐hour divorcing parent education class caused an increase in the visitation time award in divorce decrees.
- There is a disconnect between being mandated by a judge to attend a program and actual attendance.
999.
1000.