全文获取类型
收费全文 | 641篇 |
免费 | 19篇 |
国内免费 | 20篇 |
专业分类
化学 | 345篇 |
晶体学 | 5篇 |
力学 | 23篇 |
数学 | 38篇 |
物理学 | 269篇 |
出版年
2018年 | 8篇 |
2017年 | 7篇 |
2016年 | 13篇 |
2013年 | 14篇 |
2012年 | 9篇 |
2011年 | 12篇 |
2010年 | 17篇 |
2009年 | 13篇 |
2008年 | 16篇 |
2007年 | 27篇 |
2006年 | 16篇 |
2005年 | 12篇 |
2004年 | 17篇 |
2003年 | 25篇 |
2002年 | 38篇 |
2001年 | 20篇 |
2000年 | 19篇 |
1999年 | 10篇 |
1998年 | 16篇 |
1997年 | 7篇 |
1996年 | 8篇 |
1994年 | 6篇 |
1993年 | 14篇 |
1991年 | 11篇 |
1990年 | 9篇 |
1989年 | 14篇 |
1988年 | 8篇 |
1987年 | 11篇 |
1986年 | 17篇 |
1985年 | 16篇 |
1984年 | 8篇 |
1983年 | 10篇 |
1982年 | 12篇 |
1981年 | 13篇 |
1980年 | 11篇 |
1979年 | 7篇 |
1978年 | 11篇 |
1977年 | 6篇 |
1976年 | 13篇 |
1975年 | 9篇 |
1974年 | 12篇 |
1973年 | 11篇 |
1972年 | 9篇 |
1971年 | 8篇 |
1970年 | 11篇 |
1969年 | 9篇 |
1967年 | 10篇 |
1966年 | 8篇 |
1965年 | 7篇 |
1959年 | 7篇 |
排序方式: 共有680条查询结果,搜索用时 15 毫秒
1.
2.
N. U. Aldiyarov K. K. Kadyrzhanov E. M. Yakushev V. S. Zhdanov 《Hyperfine Interactions》2005,164(1-4):67-72
The conditions for achievement of high resolving power of depth selective conversion electron Mössbauer spectroscopy method at a combined installation ‘electron spectrometer–nuclear gamma-resonance spectrometer’ have been obtained. There has been made a considerable step in development of the method at its realization at a magnetic sector electron spectrometer with double focusing, equipped with electron source (a sample under investigation) of large-area and position-sensitive detector. The paper presents a prospective symmetrical version of a magnetic sector electron spectrometer that allows realizing more completely possibilities of the method. It is noted that the proposed method is particularly valuable for investigations of nanosystems, nanostrutures that contain Mössbauer nuclei. 相似文献
3.
Mass distributions of fragments in the low-energy fission of nuclei from 187Ir to 213At have been analysed. This analysis has shown that shell effects in symmetric-mode fragment mass yields from the fission of pre-actinide nuclei could be described if one assumes the existence of two strongly deformed neutron shells in the arising fragments with neutron numbers N1 ≈ 52 and N2 ≈ 68. A new method has been proposed for quantitatively describing the mass distributions of the symmetric fission mode for pre-actinides with A ≈ 180–220. 相似文献
4.
A. G. Zhdanov A. K. Zvezdin A. P. Pyatakov T. B. Kosykh D. Viehland 《Physics of the Solid State》2006,48(1):88-95
The specific features of the “incommensurate-commensurate” phase transitions induced by a magnetic field in multiferroics
(materials with coexisting magnetic and electric ordering) are considered. These materials are ferroelectromagnets, for example,
bismuth ferrite BiFeO3 and BiFeO3-based compounds, which have spatially modulated spin structures. It is shown that the interaction between the electric and
magnetic subsystems of the multiferroic material can lead to an electric-field-induced shift of the critical magnetic field
corresponding to the transition from a spatially modulated state to a homogeneous antiferromagnetic state. According to the
theoretical estimates obtained for material parameters characteristic of the bismuth ferrite, this shift is of the order of
0.5 T in an electric field of 50 kV/cm. The phase diagrams are constructed in the “electric field-magnetic field” coordinates.
The results of calculations performed in the harmonic incommensurate structure approximation are compared with the exact soliton
solution. 相似文献
5.
6.
7.
Yu. A. Zhdanov é. A. Zvezdina S. M. Statsenko A. N. Maksimova 《Chemistry of Heterocyclic Compounds》1987,23(2):149-154
The direct interaction of 2,6-diphenylpyrylium perchlorate with pyrazoles and pyrazolones led to the synthesis of 4-azolylpyrylium salts, which readily cleave a molecule of perchloric acid in the case of the N-unsubstituted pyrazolones, being converted to pyranylidene derivatives.For Communication 15, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 182–187, February, 1987. 相似文献
8.
9.
10.