全文获取类型
收费全文 | 10094篇 |
免费 | 547篇 |
国内免费 | 114篇 |
学科分类
医药卫生 | 10755篇 |
出版年
2024年 | 10篇 |
2023年 | 68篇 |
2022年 | 144篇 |
2021年 | 285篇 |
2020年 | 184篇 |
2019年 | 215篇 |
2018年 | 286篇 |
2017年 | 196篇 |
2016年 | 263篇 |
2015年 | 332篇 |
2014年 | 422篇 |
2013年 | 554篇 |
2012年 | 847篇 |
2011年 | 806篇 |
2010年 | 538篇 |
2009年 | 436篇 |
2008年 | 711篇 |
2007年 | 713篇 |
2006年 | 645篇 |
2005年 | 630篇 |
2004年 | 596篇 |
2003年 | 479篇 |
2002年 | 458篇 |
2001年 | 57篇 |
2000年 | 49篇 |
1999年 | 54篇 |
1998年 | 93篇 |
1997年 | 57篇 |
1996年 | 62篇 |
1995年 | 56篇 |
1994年 | 61篇 |
1993年 | 44篇 |
1992年 | 41篇 |
1991年 | 45篇 |
1990年 | 42篇 |
1989年 | 19篇 |
1988年 | 23篇 |
1987年 | 17篇 |
1986年 | 18篇 |
1985年 | 13篇 |
1984年 | 23篇 |
1983年 | 27篇 |
1982年 | 12篇 |
1981年 | 12篇 |
1980年 | 13篇 |
1979年 | 8篇 |
1978年 | 10篇 |
1977年 | 9篇 |
1969年 | 5篇 |
1965年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Sabina Luisa Campanelli Giuseppe Casalino Caterina Casavola Vincenzo Moramarco 《Materials》2013,6(12):5923-5941
Friction Stir Welding (FSW) is a solid-state joining process; i.e., no melting occurs. The welding process is promoted by the rotation and translation of an axis-symmetric non-consumable tool along the weld centerline. Thus, the FSW process is performed at much lower temperatures than conventional fusion welding, nevertheless it has some disadvantages. Laser Assisted Friction Stir Welding (LAFSW) is a combination in which the FSW is the dominant welding process and the laser pre-heats the weld. In this work FSW and LAFSW tests were conducted on 6 mm thick 5754H111 aluminum alloy plates in butt joint configuration. LAFSW is studied firstly to demonstrate the weldability of aluminum alloy using that technique. Secondly, process parameters, such as laser power and temperature gradient are investigated in order to evaluate changes in microstructure, micro-hardness, residual stress, and tensile properties. Once the possibility to achieve sound weld using LAFSW is demonstrated, it will be possible to explore the benefits for tool wear, higher welding speeds, and lower clamping force. 相似文献
102.
Ennio Polilli Giustino Parruti Francesca D'Arcangelo Elisa Tracanna Luigi Clerico Vincenzo Savini Francesco D'Antonio Maurizio Rosati Lamberto Manzoli Domenico D'Antonio Giovanni Nigro 《Clinical and Vaccine Immunology : CVI》2012,19(12):1991-1993
Hyperimmune globulins were reported to prevent and treat fetal cytomegalovirus (CMV) infection during pregnancy. Here, we report that infusions of standard human intravenous immunoglobulin significantly increase CMV IgG titers and avidity indexes in pregnant women, paving the way to their use for passive transfer of maternal CMV humoral immunity to fetuses. Preliminary data on perinatal outcomes of the first 67 newborns are encouraging. 相似文献
103.
104.
Vincenzo Villanacci Silvia Cristina Maurizio Muscarà Silvia Saettone Laura Broglia Elisabetta Antonelli Marianna Salemme Pietro Occhipinti Gabrio Bassotti 《Pathology, research and practice》2013
Pseudomembranous collagenous colitis is a rare pathological condition, not related to infectious agents, and characterized by thickening of the subepithelial collagen and formation of pseudomembranes. We report one such case, which responded to budesonide treatment after failures of previous approaches given, being unaware of the correct diagnosis. 相似文献
105.
106.
Histopathological evaluation of duodenal biopsy in the PreventCD project. An observational interobserver agreement study
下载免费PDF全文
![点击此处可从《APMIS : acta pathologica, microbiologica, et immunologica Scandinavica》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Vincenzo Villanacci Luisa Lorenzi Francesco Donato Renata Auricchio Piotr Dziechciarz Judit Gyimesi Sibylle Koletzko Zrinjka Mišak Vanesa Morente Laguna Isabel Polanco David Ramos Raanan Shamir Riccardo Troncone Sabine L. Vriezinga M. Luisa Mearin 《APMIS : acta pathologica, microbiologica, et immunologica Scandinavica》2018,126(3):208-214
Aim of the current study was to evaluate the inter‐observer agreement between pathologists in the diagnosis of celiac disease (CD), in the qualified context of a multicenter study. Biopsies from the “PreventCD” study, a multinational‐ prospective‐ randomized study in children with at least one‐first‐degree relative with CD and positive for HLA‐DQ2/HLA‐DQ8. Ninety‐eight biopsies were evaluated. Considering diagnostic samples with villous atrophy (VA), the agreement was satisfactory (κ = 0.84), but much less when assessing the severity of these lesions. The use of the recently proposed Corazza‐Villanacci classification showed a moderately higher level of agreement (κ = 0.39) than using the Marsh‐Oberhuber system (κ = 0.31). 57.1% of cases were considered correctly oriented. A number of >4 samples per patient was statistically associated to a better agreement; orientation did not impact on κ values. Agreement results in this study appear more satisfactory than in previous papers and this is justified by the involvement of centers with experience in CD diagnosis and by the well‐controlled setting. Despite this, the reproducibility was far from optimal with a poor agreement in grading the severity of VA. Our results stress the need of a minimum of four samples to be assessed by the pathologist. 相似文献
107.
Sergio Chieffi Alessandro Iavarone Leonardo Iaccarino Marco La Marra Giovanni Messina Vincenzo De Luca Marcellino Monda 《Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale》2014,232(11):3659-3664
Using a bisection paradigm, we investigated age-related differences in susceptibility to distractor interference. Older and younger participants were asked to bisect a horizontal line flanked by a pair of distractors, placed in either left or right hemispace. The results showed that (1) in both groups the distractors interfered with line bisection so that the localization of subjective midpoint was selectively shifted away from their position; (2) the shifting of subjective midpoint was greater in the older than in the younger group when the distractors were placed in the left hemispace. We suggest that the increase of the bisection bias in the older group depends on changes in attentional mechanisms involved in inhibiting irrelevant information. 相似文献
108.
109.
110.
Sara Bulgheroni Stefano D'Arrigo Sabrina Signorini Marilena Briguglio Maria Lucia Di Sabato Manuela Casarano Francesca Mancini Marta Romani Paolo Alfieri Roberta Battini Marina Zoppello Gaetano Tortorella Enrico Bertini Vincenzo Leuzzi Enza Maria Valente Daria Riva 《American journal of medical genetics. Part A》2016,170(12):3115-3124