全文获取类型
收费全文 | 1070篇 |
免费 | 13篇 |
国内免费 | 3篇 |
专业分类
化学 | 467篇 |
晶体学 | 9篇 |
力学 | 27篇 |
数学 | 74篇 |
物理学 | 509篇 |
出版年
2022年 | 13篇 |
2021年 | 19篇 |
2020年 | 25篇 |
2019年 | 25篇 |
2018年 | 38篇 |
2017年 | 32篇 |
2016年 | 32篇 |
2015年 | 15篇 |
2014年 | 29篇 |
2013年 | 33篇 |
2012年 | 38篇 |
2011年 | 46篇 |
2010年 | 42篇 |
2009年 | 43篇 |
2008年 | 49篇 |
2007年 | 57篇 |
2006年 | 50篇 |
2005年 | 29篇 |
2004年 | 39篇 |
2003年 | 27篇 |
2002年 | 28篇 |
2001年 | 27篇 |
2000年 | 23篇 |
1999年 | 16篇 |
1997年 | 10篇 |
1996年 | 16篇 |
1995年 | 10篇 |
1994年 | 11篇 |
1993年 | 12篇 |
1990年 | 10篇 |
1989年 | 10篇 |
1987年 | 7篇 |
1986年 | 9篇 |
1985年 | 6篇 |
1984年 | 9篇 |
1983年 | 12篇 |
1982年 | 9篇 |
1981年 | 8篇 |
1979年 | 14篇 |
1978年 | 13篇 |
1977年 | 6篇 |
1975年 | 9篇 |
1974年 | 16篇 |
1973年 | 10篇 |
1972年 | 12篇 |
1971年 | 23篇 |
1970年 | 10篇 |
1969年 | 11篇 |
1968年 | 9篇 |
1967年 | 6篇 |
排序方式: 共有1086条查询结果,搜索用时 33 毫秒
1.
Breev I. D. Likhachev K. V. Yakovleva V. V. Veishtort I. P. Skomorokhov A. M. Nagalyuk S. S. Mokhov E. N. Astakhov G. V. Baranov P. G. Anisimov A. N. 《JETP Letters》2021,114(5):274-278
JETP Letters - The effect of static mechanical strain on the splitting of spin sublevels of color centers based on spin 3/2 silicon vacancies in silicon carbide at room temperature has been shown.... 相似文献
2.
V. G. Baranov Yu. N. Devyatko A. V. Tenishev O. V. Khomyakov 《Physics of Atomic Nuclei》2015,78(12):1345-1352
It is shown that a change in the linear dimension of compacted UO2 in the sintering process is associated with its plastic yielding under the action of the forces of residual stress and capillary forces. From the curves of sintering of a fuel with doping admixtures in various gaseous media, its rate of creep is reduced. 相似文献
3.
4.
Rumyantsev R. V. Fukin G. K. Baranov E. V. Cherkasov A. V. Kozlova E. A. 《Russian Journal of Coordination Chemistry》2021,47(4):235-243
Russian Journal of Coordination Chemistry - The electron density distributions obtained by the quantum-chemical (density functional theory) calculations and molecular invariom model in the trimeric... 相似文献
5.
Lapteva U. A. Baranov A. Yu. Samsonenko D. G. Artemev A. V. 《Journal of Structural Chemistry》2022,63(4):663-668
Journal of Structural Chemistry - A four-nuclear complex [Ag4(Lut3P)2(MeCN)2](BF4)4 is synthesized by treating tris[(6-methylpyridin-2-yl)methyl]phosphine (Lut3P) with AgBF4 in a MeCN solution. The... 相似文献
6.
Novel Mechanism of Bioluminescence: Oxidative Decarboxylation of a Moiety Adjacent to the Light Emitter of Fridericia Luciferin 下载免费PDF全文
Maxim A. Dubinnyi Zinaida M. Kaskova Natalja S. Rodionova Mikhail S. Baranov Andrey Yu. Gorokhovatsky Alexey Kotlobay Kyril M. Solntsev Aleksandra S. Tsarkova Valentin N. Petushkov Ilia V. Yampolsky 《Angewandte Chemie (International ed. in English)》2015,54(24):7065-7067
A novel luciferin from a bioluminescent Siberian earthworm Fridericia heliota was recently described. In this study, the Fridericia oxyluciferin was isolated and its structure elucidated. The results provide insight into a novel bioluminescence mechanism in nature. Oxidative decarboxylation of a lysine fragment of the luciferin supplies energy for light generation, while a fluorescent CompX moiety remains intact and serves as the light emitter. 相似文献
7.
In a magnetohydrodynamic approximation, an investigation is made of the propagation of waves in a plasma, whose characteristic frequency is much less than the collision frequency of the electrons e
–1. It is assumed that the magnetic field is sufficiently strong so that the equality ee1 will be satisfied, where e is the cyclotron frequency of the rotation of the electrons. With large magnetic Reynolds numbers (Rm1), which are characteristic for many astrophysical problems, this latter condition leads to a need to take account of dispersion effects connected with Hall currents, in the absence of Joule dissipation. The dispersion equation for the propagation of small perturbations is analyzed in the limiting cases of weak dispersion and of a wave propagating along the magnetic field. In the case of weak dispersion, an equation is derived for nonlinear waves. The solutions are found in the form of stationary solitons. The region of such solutions is analyzed. A typical example of a medium with Hall dispersion is an interplanetary plasma, in which the parameter ee is generally great.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 3, pp. 108–113, May–June, 1974. 相似文献
8.
9.
P. A. Baranov V. L. Zhdanov S. A. Isaev V. B. Kharchenko A. E. Usachov 《Fluid Dynamics》2003,38(2):203-213
The unsteady two-dimensional laminar flow past a circular cylinder encased in a perforated sheath is numerically simulated. On the basis of the calculated results a technique for controlling the wake flow by diverting a portion of the flow from the forward stagnation point through internal ducts to orifices in the sheath located in the separation zone, is analyzed. 相似文献
10.
Baranov S. A. Gamirullin M. D. Kiselev A. Ph. Kuryachii A. P. Sboev D. S. Tolkachev S. N. Chernyshev S. L. 《Doklady Physics》2019,64(9):365-369
Doklady Physics - The results of experiments in a low-turbulence subsonic wind tunnel confirming the possibility of a significant attenuation of the cross-flow velocity and the intensity of... 相似文献