全文获取类型
收费全文 | 357篇 |
免费 | 0篇 |
专业分类
化学 | 147篇 |
晶体学 | 7篇 |
力学 | 62篇 |
数学 | 3篇 |
物理学 | 138篇 |
出版年
2020年 | 5篇 |
2019年 | 5篇 |
2018年 | 4篇 |
2017年 | 6篇 |
2016年 | 7篇 |
2015年 | 5篇 |
2014年 | 5篇 |
2013年 | 9篇 |
2012年 | 10篇 |
2011年 | 6篇 |
2010年 | 9篇 |
2009年 | 10篇 |
2008年 | 10篇 |
2007年 | 12篇 |
2006年 | 10篇 |
2005年 | 12篇 |
2004年 | 18篇 |
2003年 | 10篇 |
2002年 | 9篇 |
2000年 | 9篇 |
1999年 | 7篇 |
1997年 | 5篇 |
1996年 | 6篇 |
1995年 | 5篇 |
1994年 | 3篇 |
1993年 | 4篇 |
1991年 | 9篇 |
1990年 | 5篇 |
1988年 | 3篇 |
1987年 | 6篇 |
1986年 | 4篇 |
1985年 | 7篇 |
1984年 | 9篇 |
1983年 | 5篇 |
1982年 | 6篇 |
1981年 | 6篇 |
1980年 | 3篇 |
1979年 | 4篇 |
1978年 | 5篇 |
1977年 | 12篇 |
1975年 | 4篇 |
1973年 | 4篇 |
1971年 | 5篇 |
1970年 | 8篇 |
1969年 | 4篇 |
1968年 | 3篇 |
1964年 | 4篇 |
1963年 | 5篇 |
1962年 | 4篇 |
1960年 | 3篇 |
排序方式: 共有357条查询结果,搜索用时 15 毫秒
271.
272.
N. A. Gavrilenko G. M. Mokrousov O. V. Dzhiganskaya 《Journal of Analytical Chemistry》2004,59(9):871-874
It is shown that an optically transparent polymethacrylate matrix modified with 2,2-dipyridyl and iron(III) can be used as a sensor for ascorbic acid. A procedure for the solid-phase spectrophotometric and visual determination of ascorbic acid in model solutions and juices using this sensor has been developed and validated. 相似文献
273.
Alimov V. A. Gavrilenko V. G. Lipatov B. N. Nechaeva M. B. 《Radiophysics and Quantum Electronics》2004,47(3):149-160
We study theoretically the profile of a spectral line of radiation which is received by an interferometer after propagation through a medium with developed turbulent structure. We derive a formula describing the resulting frequency spectrum of an initially monochromatic radiation after its propagation through a multi-scale medium with strong large-scale and weak small-scale irregularities. It is shown that the frequency spectrum observed in this case should comprise the main spectral line with Gaussian profile and wings decreasing according to a power law with index dependent on the orientation of the interferometer baseline with respect to the direction of regular drift of frozen-in irregularities of the medium. We analyze distortions of the spectral response of a very-long-baseline interferometer due to the effect of large-scale irregularities of a medium with developed turbulent structure on wideband radiation from extraterrestrial discrete radio sources. It is shown that if the amplitude fluctuations of the received radiation are weak, then the measured frequency spectrum contains information on the drift velocity and the index of the spatial spectrum of interplanetary plasma irregularities with scales from hundreds to thousands of kilometers. 相似文献
274.
The M?ssbauer and X-rays analysis of as-received Fe-powder and Fe-powder mechanically alloyed with C using high power ultrasonics were carried out. The powder blend of Fe-powder and graphite was processed in He environment during 5 to 50 h. The dissolution of carbon in iron particles and inhomogeneous distribution of C atoms in crystallites was revealed. The ultrasonic milling of the f.c.c. Fe-Ni-powder with graphite was carried out. As established, the saturation of iron particles with carbon under ultrasonic milling occurs for much shorter time as compared to the high-energy ball milling. 相似文献
275.
V. Ya. Aleshkin D. B. Veksler V. I. Gavrilenko I. V. Erofeeva A. V. Ikonnikov D. V. Kozlov O. A. Kuznetsov 《Physics of the Solid State》2004,46(1):125-129
The submillimeter (f=130–1250 GHz) magnetoabsorption spectra of strained Ge/GeSi(111) multilayer heterostructures with quantum wells are investigated at T=4.2 K upon band-gap optical excitation. It is found that the magnetoabsorption spectra contain lines associated with the excitation of residual shallow acceptors. The resonance absorption observed can be initiated by optical transitions between the impurity states belonging to two pairs of Landau levels of holes in germanium quantum-well layers. 相似文献
276.
V.?P.?Gavrilenko E.?OksEmail author 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2004,28(2):253-257
We present detailed results of calculating the modifications in X-ray lasing lines of a H-like ion under a strong elliptically-polarized electric field of an optical laser. We show that using an elliptically-polarized electric field of an optical laser, it is possible to control the amplification and polarization of the X-ray radiation, and to vary the frequency of the X-ray lasing line. 相似文献
277.
278.
V. Ya. Aleshkin A. V. Antonov L. V. Gavrilenko V. I. Gavrilenko 《Journal of Experimental and Theoretical Physics》2005,101(4):708-716
A theory describing the photoexcited current peaks in the spectral region corresponding to the energies of longitudinal optical phonons in semiconductors doped with shallow donors is developed. The experimental data available for n-GaAs are in good agreement with the results obtained using the proposed theory. 相似文献
279.
V. Ya. Aleshkin A. V. Antonov D. B. Veksler V. I. Gavrilenko I. V. Erofeeva A. V. Ikonnikov D. V. Kozlov O. A. Kuznetsov K. E. Spirin 《Physics of the Solid State》2005,47(1):76-81
Shallow acceptors in Ge/GeSi heterostructures with quantum wells are studied theoretically and experimentally in the presence of a magnetic field. It is shown that, in addition to the cyclotron resonance lines, magnetoabsorption spectra reveal transitions from the acceptor ground state to excited states related to Landau levels from the first and second confinement subbands, as well as the resonances caused by ionization of A+ centers. 相似文献
280.