全文获取类型
收费全文 | 580832篇 |
免费 | 6322篇 |
国内免费 | 2361篇 |
专业分类
化学 | 281250篇 |
晶体学 | 9232篇 |
力学 | 29472篇 |
综合类 | 59篇 |
数学 | 81546篇 |
物理学 | 187956篇 |
出版年
2021年 | 4440篇 |
2020年 | 4847篇 |
2019年 | 5477篇 |
2018年 | 12986篇 |
2017年 | 13559篇 |
2016年 | 13063篇 |
2015年 | 6813篇 |
2014年 | 10256篇 |
2013年 | 24141篇 |
2012年 | 21397篇 |
2011年 | 30987篇 |
2010年 | 21287篇 |
2009年 | 21226篇 |
2008年 | 27453篇 |
2007年 | 29757篇 |
2006年 | 18763篇 |
2005年 | 20971篇 |
2004年 | 17576篇 |
2003年 | 15928篇 |
2002年 | 14482篇 |
2001年 | 15713篇 |
2000年 | 12044篇 |
1999年 | 9297篇 |
1998年 | 7780篇 |
1997年 | 7511篇 |
1996年 | 7309篇 |
1995年 | 6426篇 |
1994年 | 6341篇 |
1993年 | 6270篇 |
1992年 | 6722篇 |
1991年 | 6996篇 |
1990年 | 6668篇 |
1989年 | 6503篇 |
1988年 | 6347篇 |
1987年 | 6333篇 |
1986年 | 5939篇 |
1985年 | 7822篇 |
1984年 | 8039篇 |
1983年 | 6564篇 |
1982年 | 6783篇 |
1981年 | 6504篇 |
1980年 | 6317篇 |
1979年 | 6681篇 |
1978年 | 6733篇 |
1977年 | 6638篇 |
1976年 | 6746篇 |
1975年 | 6257篇 |
1974年 | 6238篇 |
1973年 | 6354篇 |
1972年 | 4466篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
141.
Herrasti P. Mazarío E. Recio Francisco J. 《Journal of Solid State Electrochemistry》2021,25(1):231-236
Journal of Solid State Electrochemistry - In this work, the use of neodymium electrodes as a basis for the immobilization of magnetite nanoparticles has been carried out. The sensitivity and... 相似文献
142.
Yin Pengpeng Liu Chang Wang Ying Guan Lei Chen Xian Xiong Xuejia Jin Hongzhe 《Russian Journal of General Chemistry》2021,91(5):897-903
Russian Journal of General Chemistry - A dinuclear Tb complex, Tb2(H2L)3(phen)2 (1), and two similar N-donor coordination complexes, Fe(phen)3·HL (2), Fe(bipy)3·HL·5H2O (3) (Na2H2L =... 相似文献
143.
Da Hyeon Choi Jiwon Park Ju Kwang Choi Kyeong Eun Lee Won Hee Lee Jinho Yang Ju Yeon Lee Yoon Jeong Park Chan Oh Ho-Ryun Won Bon Seok Koo Jae Won Chang Yoon Shin Park 《Experimental & molecular medicine》2020,52(9):1564
Oral microbes have the capacity to spread throughout the gastrointestinal system and are strongly associated with multiple diseases. Given that tonsils are located between the oral cavity and the laryngopharynx at the gateway of the alimentary and respiratory tracts, tonsillar tissue may also be affected by microbiota from both the oral cavity (saliva) and the alimentary tract. Here, we analyzed the distribution and association of the microbial communities in the saliva and tonsils of Korean children subjected to tonsillectomy because of tonsil hyperplasia (n = 29). The microbiome profiles of saliva and tonsils were established via 16S rRNA gene sequencing. Based on the alpha diversity indices, the microbial communities of the two groups showed high similarities. According to Spearman’s ranking correlation analysis, the distribution of Treponema, the causative bacterium of periodontitis, in saliva and tonsils was found to have a significant positive correlation. Two representative microbes, Prevotella in saliva and Alloprevotella in tonsils, were negatively correlated, while Treponema 2 showed a strong positive correlation between saliva and tonsils. Taken together, strong similarities in the microbial communities of the tonsils and saliva are evident in terms of diversity and composition. The saliva microbiome is expected to significantly affect the tonsil microbiome. Furthermore, we suggest that our study creates an opportunity for tonsillar microbiome research to facilitate the development of novel microbiome-based therapeutic strategies.Subject terms: Comparative genomics, Metagenomics 相似文献
144.
145.
146.
I. F. Golovnev E. I. Golovneva L. A. Merzhievsky V. M. Fomin V. E. Panin 《Physical Mesomechanics》2015,18(3):179-186
Molecular dynamics simulation was performed to study the formation of cluster structure, interfaces, and surfaces with different curvature radii in a perfect nanocrystal passed through by a nonlinear wave. It is shown that this process is a type of nanostructure self-organization in response to an external energy flux with subsequent development of a strong rotational field. 相似文献
147.
Echabaane M. Hfaiedh S. Smiri B. Saidi F. Dridi C. 《Journal of Solid State Electrochemistry》2021,25(6):1797-1806
Journal of Solid State Electrochemistry - The fast and sensitive detection of copper ions would be essential for water monitoring. Herein, we report a novel development of an impedimetric sensor... 相似文献
148.
JETP Letters - An Erratum to this paper has been published: https://doi.org/10.1134/S0021364022400028 相似文献
149.
Journal of Experimental and Theoretical Physics - The nature of the training effect in exchange-biased compounds is studied. This effect consists in a decrease in the exchange bias field (HEB)... 相似文献
150.
Algebras and Representation Theory - We introduce and study the category of twisted modules over a triangular differential graded bocs. We show that in this category idempotents split, that it... 相似文献