全文获取类型
收费全文 | 261篇 |
免费 | 1篇 |
专业分类
化学 | 123篇 |
晶体学 | 4篇 |
力学 | 19篇 |
数学 | 14篇 |
物理学 | 102篇 |
出版年
2022年 | 3篇 |
2021年 | 6篇 |
2020年 | 7篇 |
2019年 | 4篇 |
2018年 | 4篇 |
2017年 | 14篇 |
2016年 | 11篇 |
2015年 | 2篇 |
2014年 | 10篇 |
2013年 | 10篇 |
2012年 | 8篇 |
2011年 | 13篇 |
2010年 | 11篇 |
2009年 | 7篇 |
2008年 | 5篇 |
2007年 | 10篇 |
2006年 | 13篇 |
2005年 | 13篇 |
2004年 | 6篇 |
2003年 | 7篇 |
2002年 | 6篇 |
2001年 | 7篇 |
2000年 | 4篇 |
1999年 | 3篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1993年 | 2篇 |
1990年 | 3篇 |
1988年 | 2篇 |
1987年 | 3篇 |
1982年 | 3篇 |
1980年 | 5篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1976年 | 3篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1973年 | 7篇 |
1971年 | 1篇 |
1970年 | 2篇 |
1969年 | 2篇 |
1968年 | 5篇 |
1967年 | 4篇 |
1966年 | 1篇 |
1965年 | 2篇 |
1963年 | 1篇 |
1962年 | 2篇 |
1959年 | 1篇 |
1957年 | 5篇 |
1956年 | 1篇 |
排序方式: 共有262条查询结果,搜索用时 15 毫秒
1.
2.
S.N. Vdovichev B.A. Gribkov S.A. Gusev E. Il’ichev Yu.N. Nozdrin G.L. Pakhomov A.V. Samokhvalov R. Stolz A.A. Fraerman 《Journal of magnetism and magnetic materials》2006
The effect of an array of ferromagnetic nanoparticles on the field-dependent critical current of the short overlap Josephson junction is experimentally studied. Large reversible variations of the maximum critical current are observed depending on the magnetic state of the particles. The pronounced commensurability effects are detected which are proved by the additional peaks of magnetic field induced diffraction pattern. 相似文献
3.
4.
5.
6.
V. G. Granik A. G. Sukhoruchkin N. S. Kuryatov V. P. Pakhomov O. S. Anisimova R. G. Glushkov 《Chemistry of Heterocyclic Compounds》1973,9(7):880-883
The diethyl acetal of N-methylpiperidin-2-one has been synthesized and its reactions with compounds having active CH2 and CH3 groups have been studied. In the reaction of diethyl acetal of N-methylpiperidin-2-one with malonic ester, in addition to the condensation product, ethylmalonic ester is formed. The reaction of the acetal with benzoic acid leads to O-alkylation and the formation of ethyl benzoate.For communication IV, see [2].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 954–957, July, 1973. 相似文献
7.
R. M. Arkhipov M. V. Arkhipov A. V. Pakhomov D. O. Zhiguleva N. N. Rosanov 《Optics and Spectroscopy》2018,124(4):541-548
By numerically solving the system of Maxwell–Bloch equations, we have examined theoretically collisions of extremely short single-cycle and unipolar subcycle pulses in a nonlinear resonant medium under conditions that the light interacts coherently with the medium. The dynamics of the electric field of structures of light-induced polarization and inversion difference has been considered in the situation in which pulses are overlapped in the medium. We show that the states of the medium (to the right and to the left of the overlap region of the pulses) may differ. In particular, we show that polarization waves with different characteristics can exist in the regions of the medium that are located on opposite sides of the overlap region of the pulses. These waves travel in different directions and have different spatial frequencies. 相似文献
8.
R. M. Arkhipov D. O. Zhiguleva A. V. Pakhomov M. V. Arkhipov I. Babushkin N. N. Rosanov 《Optics and Spectroscopy》2018,124(4):536-540
The possibility of generation of quasi-unipolar extremely short pulses (with a duration of several periods of field oscillations) is theoretically analyzed for the excitation of a circular, nonlinear, and resonant medium with a light spot. The light spot rotates along a circle with a velocity that exceeds the speed of light in vacuum, while particles of the medium are distributed uniformly along the circle. It is shown that, by introducing a delay in the form of a phase plate into the system, one can control the shape, the duration, and the amplitude of generated pulses. 相似文献
9.
Arkhipov R. M. Arkhipov M. V. Babushkin I. Pakhomov A. V. Rosanov N. N. 《Optics and Spectroscopy》2020,128(4):529-535
Optics and Spectroscopy - Conventionally, attosecond pulses are obtained using generation of high-order optical harmonics upon excitation of various media by femtosecond laser pulses with the... 相似文献
10.
The opportunities given by the low-frequency Raman spectroscopy for studying the ordered structures in polymers are presented
and illustrated by examples of application of two techniques. The longitudinal acoustic modes (LAM) excited in straight chain
segments of macromolecules are characteristic in linear semicrystalline polymers, while the Boson peak (BP) manifests itself
in amorphous (glassy) polymers. Both these features are due to the laser light scattering from the acoustic vibrations localized
either in the ordered one-dimension structures (LAM) or in the mid-range order correlation sphere (BP). 相似文献