全文获取类型
收费全文 | 123155篇 |
免费 | 6865篇 |
国内免费 | 7624篇 |
专业分类
化学 | 73933篇 |
晶体学 | 1489篇 |
力学 | 6423篇 |
综合类 | 382篇 |
数学 | 15489篇 |
物理学 | 39928篇 |
出版年
2023年 | 832篇 |
2022年 | 1736篇 |
2021年 | 2424篇 |
2020年 | 2606篇 |
2019年 | 2827篇 |
2018年 | 3149篇 |
2017年 | 3068篇 |
2016年 | 4103篇 |
2015年 | 2916篇 |
2014年 | 4081篇 |
2013年 | 6262篇 |
2012年 | 6492篇 |
2011年 | 8056篇 |
2010年 | 5735篇 |
2009年 | 5797篇 |
2008年 | 5668篇 |
2007年 | 5361篇 |
2006年 | 4880篇 |
2005年 | 4701篇 |
2004年 | 5342篇 |
2003年 | 4237篇 |
2002年 | 4147篇 |
2001年 | 3405篇 |
2000年 | 2500篇 |
1999年 | 2045篇 |
1998年 | 1977篇 |
1997年 | 1690篇 |
1996年 | 1603篇 |
1995年 | 1362篇 |
1994年 | 1369篇 |
1993年 | 1647篇 |
1992年 | 1634篇 |
1991年 | 1480篇 |
1990年 | 1484篇 |
1989年 | 1395篇 |
1988年 | 1052篇 |
1987年 | 985篇 |
1986年 | 976篇 |
1985年 | 1032篇 |
1984年 | 1028篇 |
1983年 | 904篇 |
1982年 | 870篇 |
1979年 | 842篇 |
1978年 | 848篇 |
1977年 | 845篇 |
1976年 | 947篇 |
1975年 | 838篇 |
1974年 | 875篇 |
1973年 | 866篇 |
1972年 | 770篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
921.
Yu. F. Popov A. M. Kadomtseva G. P. Vorob’ev S. S. Krotov K. I. Kamilov M. M. Lukina 《Physics of the Solid State》2003,45(11):2155-2159
Complex studies of the magnetic, magnetoelectric, and magnetoelastic properties of GdMn2O5 single crystals in strong pulsed magnetic fields are carried out in order to obtain additional indirect information on the character of the rare-earth and manganese spin ordering. It is shown that magnetic ordering of Gd3+ spins affects the manganese sublattice spin orientation and initiates new magnetic phase transitions. The observed magnetoelectric properties of the GdMn2O5 system are interpreted in terms of the theory of phase transitions. 相似文献
922.
The nonstationary Reynolds equation of the theory of gas lubrication is considered. The existence and uniqueness of a solution to the initial-boundary value problem for this equation are established in the case of sufficiently smooth data. Estimates for the solution are obtained for large bearing numbers. Bibliography: 8 titles. 相似文献
923.
S. K. Gorbatsevich I. A. Kaputskaya S. A. Maskevich S. Yu. Mikhnevich N. D. Strekal’ 《Optics and Spectroscopy》2004,97(2):238-243
The fluorescence of solid solutions of CdSe/ZnS quantum dots and the organic dye DODCI is investigated. It is shown that nonradiative transfer of electronic excitation energy to dye molecules, which with some probability lose their acceptor properties as a result of photoisomerization or photodegradation, is responsible for a significant increase in the fluorescence intensity of a donor. The degree of polarization of the donor fluorescence attains values exceeding 0.5, which is due to the difference in the fluorescence quantum yields of donors with different orientations of the oscillator with respect to the electric vector of an excitation light wave. A numerical simulation of the experimentally observed dependences is performed. 相似文献
924.
925.
Yu. I. Ryabukhin A. Yu. Eliseeva K. F. Suzdalev 《Chemistry of Heterocyclic Compounds》1992,28(2):236-237
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 280–281, February, 1992. 相似文献
926.
Ya. Yu. Nikitin 《Journal of Mathematical Sciences》1992,61(1):1891-1896
The local Chernoff efficiency of the sign and Wilcoxon statistics are derived for the testing of symmetry on the basis of the analysis of the probabilities of large deviations of these statistics under the hypothesis and the alternative.Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova Akademii Nauk SSSR, Vol. 177, pp. 101–107, 1989. 相似文献
927.
Yu. N. Gordeev 《Fluid Dynamics》1995,30(6):870-876
The initial stage of propagation of a vertical hydraulic fracture in an impermeable or low-permeability stratum is considered within the framework of the pseudo-three-dimensional Perkins-Kern model.Moscow. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 6, pp. 79–86, November–December, 1995. 相似文献
928.
S. P. Timoshenko Institute of Mechanics, National Academy of Sciences of the Ukraine. Translated from Prikladnaya Mekhanika, Vol. 31, No. 9, pp. 15–23, September, 1995. 相似文献
929.
E.P. Yelsukov Yu.N. Vorobyov T.I. Arbusova I.B. Smolyak 《Journal of magnetism and magnetic materials》1994,130(1-3):44-50
We have measured the concentration dependence of the average magnetic moment per Fe atom
Fe(x) in microcrystalline and amorphous Fe-P alloys obtained over a wide concentration range using electrochemical deposition. The model of local magnetic moments has been used to described
Fe(x). On the basis of this model the effects of phosphorus on the value
Fe are explained in terms of the parameters of the local environment of the Fe atom. 相似文献
930.
Yu. N. Obukhov 《General Relativity and Gravitation》1992,24(2):121-128
Cosmological models for a universe with expansion and rotation are considered. In particular, we analyse some effects of the universal rotation on the observational cosmology. It is shown that pure cosmic rotation does not produce neither causality voilations, nor parallax effects, nor anisotropy of the microwave background radiation. It can be detected by studying angular dependence of standard cosmological tests, and is directly measurable via polarization observations. The latter are used to obtain experimental estimates for the direction and value of the rotation of the universeThis essay received the third award from the Gravity Research Foundation, 1991 — Ed. 相似文献