全文获取类型
收费全文 | 4335篇 |
免费 | 139篇 |
专业分类
各国政治 | 198篇 |
工人农民 | 156篇 |
世界政治 | 257篇 |
外交国际关系 | 140篇 |
法律 | 3164篇 |
中国政治 | 20篇 |
政治理论 | 502篇 |
综合类 | 37篇 |
出版年
2023年 | 27篇 |
2021年 | 39篇 |
2020年 | 63篇 |
2019年 | 72篇 |
2018年 | 121篇 |
2017年 | 131篇 |
2016年 | 121篇 |
2015年 | 80篇 |
2014年 | 102篇 |
2013年 | 393篇 |
2012年 | 130篇 |
2011年 | 169篇 |
2010年 | 96篇 |
2009年 | 68篇 |
2008年 | 141篇 |
2007年 | 153篇 |
2006年 | 140篇 |
2005年 | 115篇 |
2004年 | 158篇 |
2003年 | 154篇 |
2002年 | 141篇 |
2001年 | 164篇 |
2000年 | 146篇 |
1999年 | 110篇 |
1998年 | 22篇 |
1993年 | 29篇 |
1992年 | 64篇 |
1991年 | 86篇 |
1990年 | 86篇 |
1989年 | 92篇 |
1988年 | 97篇 |
1987年 | 89篇 |
1986年 | 75篇 |
1985年 | 77篇 |
1984年 | 68篇 |
1983年 | 59篇 |
1982年 | 24篇 |
1981年 | 20篇 |
1979年 | 30篇 |
1978年 | 34篇 |
1977年 | 22篇 |
1976年 | 28篇 |
1975年 | 28篇 |
1974年 | 37篇 |
1973年 | 37篇 |
1972年 | 36篇 |
1971年 | 36篇 |
1970年 | 38篇 |
1969年 | 32篇 |
1968年 | 28篇 |
排序方式: 共有4474条查询结果,搜索用时 62 毫秒
961.
Karen V. Hansen 《Women's history review》2019,28(1):7-22
In this article the author explores the interconnections between the social and the material—as people move to a space on the land, coexisting with one another. By focusing in on one specific place—the Spirit Lake Dakota Indian Reservation (formerly called the Devils Lake Sioux Indian Reservation) in North Dakota—the author analyzes what happened when white immigrants came to homestead and live on land historically reserved for Dakotas. Against the backdrop of Native dispossession, this illustrative case reveals the ways everyday interactions created entanglements through landownership, the gendered division of paid work, neighboring practices, and leasing land. It challenges us to uncover gendered processes, probe denials, and interrogate silences. 相似文献
962.
Chantal Turpin B.Sc. Christopher Kyle Ph.D. David V. Beresford Ph.D. 《Journal of forensic sciences》2014,59(5):1295-1302
Postfeeding dispersal involves migration of larvae away from their food source in order to pupate. Puparia are difficult to find, yet are important for estimating PMI, and missing puparia during collection can result in inaccurate estimations. This study investigates the late season maggot dispersal patterns for blow flies at coyote carcasses in two habitats with an aim to improving puparia collection procedures. Puparia samples collected from various dispersal distances and directions tested the spatial distribution patterns of the various species using the variance/mean ratio (VMR). Lucilia illustris was the most common species to emerge, with a preferred minimum dispersal distance of more than 50.8 cm and an overall VMR value of 14.91, indicating this species had a clumped distribution pattern. These findings highlight that current collection procedures that use random sampling from under carcasses do not adequately account for the spatial distribution of larvae. 相似文献
963.
964.
965.
Hsu Henda Y. Vásquez Bob Edward McDowall David 《Journal of Experimental Criminology》2020,16(4):607-623
Journal of Experimental Criminology - The United States initiated sweeping counterterrorism efforts after the September 11, 2001 terrorist attacks. This study tests a backlash hypothesis as it... 相似文献
966.
Francisco Arnau M.D. Ph.D. Julio García-Guerrero M.D. Ph.D. Ana Benito Ph.D. Enrique J. Vera-Remartínez R.N. M.Sc. Abel Baquero Ph.D. Gonzalo Haro M.D. Ph.D. 《Journal of forensic sciences》2020,65(1):160-165
The characteristics of mental disorders, as well as deficiencies in their treatment, must be properly defined. This was a prospective, longitudinal, observational study, in which all men referred to a penitentiary psychiatric consultation of three penitentiary centers in Spain were invited to participate. Those who consented to participation (1328) were interviewed at the baseline timepoint and at intervals for up to 3 years. The presence of mental disorders was high: 68.2% had a cluster B personality disorder, 14% had an affective and/or anxiety disorders, 13% had schizophrenia, and over 80% had a dual disorder. Polypharmacy was the norm. Moreover, the health care received in prison did not match that provided in the community in terms of quantity and quality. These results should help to facilitate the design of mental healthcare provision for prisoners, focusing on both the most frequent patient profiles and equality of care. 相似文献
967.
968.
Garrett Oetelaar D.V.M. Hock Gan Heng D.A.C.V.R. D.E.C.V.D.I. Chee Kin Lim D.E.C.V.D.I. Abigail Cox D.A.C.V.P. Hsin-Yi Weng Ph.D. 《Journal of forensic sciences》2020,65(5):1524-1529
Intraosseous T1-weighted (T1W) and short-tau inversion recovery (STIR) magnetic resonance imaging (MRI) signal intensity changes—so-called bone marrow edema—may be able to differentiate antemortem and postmortem fractures in human forensic imaging. The primary objective of this study was to investigate this hypothesis using an animal model. Three juvenile Landrace pigs were anesthetized and underwent MRI of both tibiae and both radii using a 1.5 T magnet. T1W, T2-weighted (T2W), STIR, and T2* sequences were included. Antemortem fractures were induced in both tibiae and postmortem fractures in both radii, and MRI was repeated. Two board-certified radiologists blinded to fracture group jointly evaluated the images for intraosseous and soft tissue signal intensity changes. Sensitivity (Se) and specificity (Sp) in identifying antemortem fractures were calculated based on intraosseous, soft tissue, and combined intraosseous and soft tissue signal intensity changes. Intraosseous and soft tissue signal intensity changes, when present, were hyperintense in all sequences. Intraosseous hyperintensity in T1W and T2W sequences yielded Sp of 100% for antemortem fractures. Regardless of sequence, soft tissue hyperintensity was comparatively more sensitive than intraosseous hyperintensity. Sensitivity for each sequence could be maximized by assessment of soft tissue and intraosseous hyperintense signals together; for the T1W sequence, such assessment optimized diagnostic utility yielding a Se of 100% and Sp of 83%. In summary, MRI—particularly the T1W sequence—can differentiate antemortem and postmortem fractures and may be a useful adjunct to the forensic analyses of fractures. 相似文献
969.
970.