全文获取类型
收费全文 | 199篇 |
免费 | 11篇 |
国内免费 | 1篇 |
专业分类
化学 | 135篇 |
晶体学 | 10篇 |
力学 | 10篇 |
数学 | 3篇 |
物理学 | 53篇 |
出版年
2022年 | 5篇 |
2021年 | 5篇 |
2020年 | 8篇 |
2019年 | 5篇 |
2018年 | 7篇 |
2017年 | 7篇 |
2016年 | 9篇 |
2015年 | 9篇 |
2014年 | 8篇 |
2013年 | 10篇 |
2012年 | 10篇 |
2011年 | 10篇 |
2010年 | 4篇 |
2009年 | 6篇 |
2008年 | 6篇 |
2007年 | 11篇 |
2006年 | 11篇 |
2005年 | 7篇 |
2004年 | 2篇 |
2003年 | 4篇 |
2001年 | 3篇 |
2000年 | 3篇 |
1998年 | 2篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1993年 | 2篇 |
1991年 | 2篇 |
1989年 | 3篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 6篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 2篇 |
1980年 | 4篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1977年 | 3篇 |
1976年 | 2篇 |
1975年 | 3篇 |
1974年 | 3篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1971年 | 2篇 |
1970年 | 1篇 |
1969年 | 3篇 |
1966年 | 1篇 |
排序方式: 共有211条查询结果,搜索用时 31 毫秒
91.
Jahn–Teller Effect in Circulenes: X‐ray Diffraction Study of Coronene and Corannulene Radical Anions
Dr. Alexander S. Filatov Natalie J. Sumner Sarah N. Spisak Dr. Alexander V. Zabula Andrey Yu. Rogachev Prof. Marina A. Petrukhina 《Chemistry (Weinheim an der Bergstrasse, Germany)》2012,18(49):15753-15760
Single‐crystal X‐ray diffraction studies of two polyaromatic radical anions crystallized as sodium salts, namely [Na(DME)3]+[C20H10?] ( 1 ) and [Na(DME)3]+[C24H12?] ( 2 ) are reported. This allowed the first structural evaluation of Jahn–Teller (JT) effects for monoreduced circulenes and a comparison between bowl‐shaped corannulene and planar coronene. The Cs and D2h symmetrical distortions are found to fit the experimental data for C20H10.? and C24H12.?, respectively. The continuous symmetry measure (CSM) analysis was carried out to provide a quantitative measure of the JT distortions in 1 and 2 . In addition, the X‐ray crystallographic results were fully supported by DFT calculations. 相似文献
92.
A. D. Rogachev N. I. Komarova A. V. Pozdeeva D. V. Korchagina V. G. Vasil’ev N. F. Salakhutdinov G. A. Tolstikov 《Chemistry of Natural Compounds》2012,48(1):1-7
The reactions of pterostilbenoside (trans-3,5-dimethoxystilben-4′-O-β-D-glucoside) and Ar–O–Tr derivatives of resveratroloside (3,5-dihydroxystilben-4′-O-β-D-glucoside) and pinostilbenoside (3-methoxy-5-hydroxystilben-4′-O-β-D-glucoside) with NaOCl and t-BuOCl in the presence of the stable nitroxyl radical TEMPO were studied in various media. It was found that the principal
product of pterostilbenoside transformation was its 2,6-dichloroderivative, a part of which was oxidized to form 2,6-dichloropterostilbene
glucuronide. Trityl ethers of resveratroloside and pinostilbenoside reacted with the hypochlorites to form mixtures of products. 相似文献
93.
N. I. Giricheva G. V. Girichev N. P. Kuzmina Yu. S. Medvedeva A. Yu. Rogachev 《Journal of Structural Chemistry》2009,50(1):52-59
In the framework of synchronous gas-phase electron diffraction and mass spectrometry experiment, the saturated vapor of N,N′-ethylenebis(salicylaldiminate) copper(II) CuO2N2C16H14 is studied at a temperature T 574(5) K. It is found that evaporation is congruent and the saturated vapor consists of monomeric molecules. Electron diffraction data are proved to correspond to the geometric model for the CuO2N2C16H14 molecule of C 2 symmetry with an almost planar structure of the CuN2O2 coordination fragment and internuclear distances \(r_{h_1 } \)(Cu-O) = 1.917(13) Å and \(r_{h_1 } \)(Cu-N) = 1.931(15) Å. The stuctural parameters obtained are compared to those quantum chemically calculated and molecular parameters in crystals. 相似文献
94.
Doklady Physics - The critical cooling rates $${{{v}}_{{\text{c}}}}$$ at which pure metals Mg, Al, Ti, Fe, Co, Ni, Cu, Zr, Mo, Pd, Ag, Ta, W, Pt, Au, and Pb transit to an amorphous state (vitrify),... 相似文献
95.
96.
97.
98.
99.
Morphological features of the first growth stages of polytetrafluoroethylene films from the active gas phase on the silicon surface treated by various methods were studied. The influence of the surface energy of the support on the distribution of polymer microparticles in these stages, on the distribution kinetics was determined. 相似文献