全文获取类型
收费全文 | 277篇 |
免费 | 2篇 |
专业分类
化学 | 129篇 |
晶体学 | 3篇 |
力学 | 8篇 |
数学 | 24篇 |
物理学 | 115篇 |
出版年
2022年 | 10篇 |
2021年 | 8篇 |
2020年 | 4篇 |
2019年 | 16篇 |
2018年 | 11篇 |
2017年 | 14篇 |
2016年 | 15篇 |
2015年 | 4篇 |
2014年 | 9篇 |
2013年 | 15篇 |
2012年 | 17篇 |
2011年 | 6篇 |
2010年 | 16篇 |
2009年 | 9篇 |
2008年 | 7篇 |
2007年 | 6篇 |
2006年 | 9篇 |
2005年 | 4篇 |
2004年 | 11篇 |
2003年 | 4篇 |
2002年 | 12篇 |
2000年 | 4篇 |
1999年 | 4篇 |
1998年 | 2篇 |
1997年 | 4篇 |
1996年 | 2篇 |
1993年 | 2篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 3篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1976年 | 1篇 |
1975年 | 4篇 |
1974年 | 4篇 |
1973年 | 3篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1970年 | 2篇 |
1969年 | 2篇 |
1968年 | 1篇 |
排序方式: 共有279条查询结果,搜索用时 0 毫秒
51.
V.V. Rumyantsev E.V. Orlenko B.N. Libenson 《Zeitschrift für Physik B Condensed Matter》1997,103(1):53-60
The mechanism of weak localization of relatively fast electrons scattered with a fixed energy loss from disordered media is examined. The main focus of this paper is to put forward an explanation for why coherent enhancement of electron scattering in the inelastic-scattering channel takes place at angles which differ from π. A simplified kinematic model is proposed to determine the basic properties of the weak localization of electrons in the inelastic scattering channel. The model easily reproduces the range of scattering angles typical for the weak localization of electrons with fixed energy loss. The procedure does not require calculation of the contribution from the crossed diagrams. The results agree with those based on the dynamical theory associated with the calculation of the crossed and ladder diagrams. It is possible to follow the transition from the weak localization of the new type to the ordinary weak localization with decreasing energy loss. The weak localization of the new type is in accord with the weak localization of regular type if the energy loss is about the energy of an optical phonon. 相似文献
52.
V. A. Vazhenin E. L. Rumyantsev M. Yu. Artemov K. M. Starichenko 《Physics of the Solid State》1998,40(2):293-298
The polar angular dependence of the anomalous linewidth of three EPR transitions in the Gd3+ trigonal center has been used to determine the broadening mechanism. It is shown that the dominant mechanism of Gd3+ EPR signal broadening in the vicinity of the ferroelectric transition is the critically growing spread of the b
21 and c
21 parameters accounting for the odd-order fields of remote charge-compensating defects.
Fiz. Tverd. Tela (St. Petersburg) 40, 321–326 (February 1998) 相似文献
53.
Physics of Atomic Nuclei - A general analysis of the amplitude for an n-vertex one-loop process in a strong magnetic field is performed by using the asymptotic form of the electron propagator in a... 相似文献
54.
Makarevich I. P. Rakhel A. D. Rumyantsev B. V. Fridman B. É. 《Physics of the Solid State》2004,46(4):675-677
The graphite-diamond phase transition under shock-wave-induced electrodynamic compression has been studied. A sample of a
carbon-containing material was loaded by axisymmetric collapse of a copper liner. The liner was acted upon by ponderomotive
forces generated by pulsed electric currents with amplitudes of 2–4 MA. The collapse of the cylindrical copper liner with
a velocity of ∼1 km/s produced stepped loading of the carbon material in an ampoule from 5 to 40 GPa over 4 μs. Purification
of the preserved material yielded agglomerates containing polycrystalline diamond. The average size of diamond polycrystals
in the agglomerates is 1–2 μm, and the agglomerate yield is ∼3%.
__________
Translated from Fizika Tverdogo Tela, Vol. 46, No. 4, 2004, pp. 659–661.
Original Russian Text Copyright ? 2004 by Makarevich, Rakhel, Rumyantsev, Fridman. 相似文献
55.
Guseva G. B. Rumyantsev E. V. Antina E. V. Berezin M. B. Vyugin A. I. 《Russian Journal of Coordination Chemistry》2004,30(5):371-374
The kinetics of deprotonation of 1,3,7,13,17,19-hexamethyl-2,8,12,18-tetrabutylbiladiene-a,c dyhydrobromide on treatment with nucleophilic reagents (pyridine, dimethylformamide, dimethyl sulfoxide) in carbon tetrachloride was measured by electron absorption spectroscopy in the temperature range of 293.15–303.15 K. The effects of the reactant concentrations, the temperature, and the electron-donor properties of the nucleophilic reagent on the kinetics of deprotonation of biladiene-a,c as the salt with HBr are discussed. 相似文献
56.
V. V. Rumyantsev E. V. Orlenko B. N. Libenson 《Journal of Experimental and Theoretical Physics》1997,84(3):552-559
The mechanism of weak localization of relatively fast electrons scattered with a fixed energy loss from disordered media is
examined. The main focus of this paper is to put forward an explanation why coherent enhancement of electron scattering in
the inelastic-scattering channel takes place at angles which differ from π. A simplified kinematic model is proposed to determine the basic properties of the weak localization of electrons in the
inelastic scattering channel. The model reproduces easily the range of scattering angles typical of the weak localization
of electrons with a fixed energy loss. The procedure does not require calculation of the contribution from the crossed diagrams.
The results agree with those based on the dynamical theory associated with the calculation of the crossed and ladder diagrams.
It is possible to follow the transition from the new type of weak localization to the ordinary weak localization with decreasing
energy loss. The new-type weak localization is in agreement with the regular weak localization if the energy loss is approximately
equal to the energy of an optical phonon.
Zh. éksp. Teor. Fiz. 111, 1001–1015 (March 1997)
Published in English in the original Russian journal. Reproduced here with stylistic changes by the Translation Editor. 相似文献
57.
58.
59.
A. V. Ivashchenko V. T. Lazareva V. G. Rumyantsev 《Chemistry of Heterocyclic Compounds》1982,18(2):190-192
The reaction of 1,2-diamino-4-arylimidazoles with isatin and N-methylisatin, as a result of which the corresponding imidazo[1,2:2,3]-1,2,4-triazino[6,5-b]indoles were obtained, was studied. The corresponding Schiff base was also isolated in the case of the reaction of 1,2-diamino-4-(p-tert-butylphenylene)imidazole with N-methylisatin. The electronic and IR spectra of the synthesized compounds were studied. The possibility of the use of the degree of orderliness of the synthesized compounds in a liquid-crystal matrix as an additional spectral method in proving the structures of the compounds is demonstrated.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 242–245, February, 1982. 相似文献
60.
Optics and Spectroscopy - The propagation of an electromagnetic excitation localized in a nonideal quasi-two-dimensional Si/SiO2 system that constitutes a topologically ordered set of strips with a... 相似文献