全文获取类型
收费全文 | 236篇 |
免费 | 0篇 |
专业分类
化学 | 183篇 |
力学 | 1篇 |
数学 | 2篇 |
物理学 | 50篇 |
出版年
2022年 | 2篇 |
2020年 | 2篇 |
2019年 | 4篇 |
2018年 | 5篇 |
2017年 | 8篇 |
2016年 | 6篇 |
2015年 | 2篇 |
2014年 | 5篇 |
2013年 | 8篇 |
2011年 | 4篇 |
2010年 | 2篇 |
2009年 | 4篇 |
2008年 | 6篇 |
2007年 | 5篇 |
2006年 | 3篇 |
2005年 | 8篇 |
2004年 | 8篇 |
2003年 | 9篇 |
2001年 | 3篇 |
2000年 | 4篇 |
1997年 | 3篇 |
1996年 | 2篇 |
1995年 | 4篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1986年 | 5篇 |
1985年 | 4篇 |
1984年 | 4篇 |
1983年 | 5篇 |
1982年 | 3篇 |
1981年 | 2篇 |
1980年 | 9篇 |
1979年 | 7篇 |
1978年 | 4篇 |
1977年 | 8篇 |
1976年 | 7篇 |
1975年 | 6篇 |
1972年 | 3篇 |
1970年 | 2篇 |
1969年 | 7篇 |
1968年 | 8篇 |
1967年 | 6篇 |
1966年 | 4篇 |
1965年 | 5篇 |
1961年 | 1篇 |
1960年 | 1篇 |
排序方式: 共有236条查询结果,搜索用时 15 毫秒
231.
Yu. V. Gulyaev E. A. Vilkov P. E. Zil’berman G. M. Mikhailov A. V. Chernykh S. G. Chigarev 《JETP Letters》2014,99(9):508-511
The stimulated emission of terahertz radiation in magnetic junctions at room temperature resulting from the current injection of nonequilibrium spins is observed. Contacts between two ferromagnetic layers as well as between a ferromagnetic and an antiferromagnetic layer are investigated. The current produces the population inversion of spin energy levels. As the system is placed in a cavity, positive feedback and stimulated emission appear. The development of a dominant emission peak and onset of electromagnetic turbulence are observed. 相似文献
232.
233.
Michaela Harmošová Mária Vilková Martin Kello Lukáš Smolko Erika Samol'ová Dominika Šebová Ivan Potočňák 《Acta Crystallographica. Section C, Structural Chemistry》2023,79(8):316-323
A new zirconium(IV) complex, diaquabis(8-hydroxyquinoline-2-carboxylato-κ3N,O2,O8)zirconium(IV) dimethylformamide disolvate, [Zr(C10H5NO3)2(H2O)2]·2C3H7NO or [Zr(QCa)2(H2O)2]·2DMF ( 1 ) (HQCaH is 8-hydroxyquinoline-2-carboxylic acid and DMF is dimethylformamide), was prepared and characterized by elemental analysis, IR spectroscopy and single-crystal X-ray structure analysis. Complex 1 is a mononuclear complex in which the ZrIV atoms sit on the twofold axis and they are octacoordinated by two N and six O atoms of two tridentate anionic QCa2− ligands, and two aqua ligands. Outside the coordination sphere are two DMF molecules bound to the complex unit by hydrogen bonds. The structure and stability of complex 1 in dimethyl sulfoxide were verified by NMR spectroscopy. The cytotoxic properties of 1 and HQCaH were studied in vitro against eight cancer cell lines, and their selectivity was tested on the BJ-5ta noncancerous cell line. Both the complex and HQCaH exhibited low activity, with IC50 > 200 µM. DNA and human serum albumin (HSA) binding studies showed that 1 binds to calf thymus (CT) DNA via intercalation and is able to bind to the tryptophan binding site of HSA (Trp-214). 相似文献
234.
Pudikov D. A. Zhizhin E. V. Rybkin A. G. Rybkina A. A. Zhukov Yu. M. Vilkov O. Yu. Shikin A. M. 《Physics of the Solid State》2016,58(12):2550-2554
Physics of the Solid State - A comparative investigation of graphene prepared by cracking of propylene (C3H6) on nickel surfaces with different orientations, Ni(111) and Ni(100), has been carried... 相似文献
235.
Jozef Gonda Michael Široký Miroslava Martinková Samuel Homolya Mária Vilková Martina Bago Pilátová Sergej Šesták 《Tetrahedron》2019,75(3):398-408
A straightforward stereoselective route towards (3aR,5R,6S,7R,7aR)- and (3aR,5R,6S,7R,7aR)-octahydro-1H-indole-5,6,7-triol, analogues of castanospermine, starting from the corresponding shikimic acid derivatives is described. The key transformations of this approach are the Overman rearrangement and ring-closing metathesis to form the diastereoisomeric cis-fused (5R,6S,7R)-octahydro-1H-indole-5,6,7-triols in good overall yields. Evaluation for in vitro cytotoxicity revealed for some prepared compounds significant antiproliferative activity and weak glycosidase inhibition. 相似文献
236.