全文获取类型
收费全文 | 99070篇 |
免费 | 5417篇 |
国内免费 | 4628篇 |
专业分类
化学 | 56249篇 |
晶体学 | 1331篇 |
力学 | 5582篇 |
综合类 | 322篇 |
数学 | 11832篇 |
物理学 | 33799篇 |
出版年
2023年 | 749篇 |
2022年 | 1709篇 |
2021年 | 2109篇 |
2020年 | 2310篇 |
2019年 | 2506篇 |
2018年 | 2892篇 |
2017年 | 2823篇 |
2016年 | 3486篇 |
2015年 | 2409篇 |
2014年 | 3477篇 |
2013年 | 4919篇 |
2012年 | 5055篇 |
2011年 | 5354篇 |
2010年 | 4249篇 |
2009年 | 4255篇 |
2008年 | 4453篇 |
2007年 | 4173篇 |
2006年 | 3804篇 |
2005年 | 3375篇 |
2004年 | 3036篇 |
2003年 | 2711篇 |
2002年 | 2827篇 |
2001年 | 2547篇 |
2000年 | 1987篇 |
1999年 | 1601篇 |
1998年 | 1534篇 |
1997年 | 1329篇 |
1996年 | 1293篇 |
1995年 | 1077篇 |
1994年 | 1156篇 |
1993年 | 1095篇 |
1992年 | 1062篇 |
1991年 | 1124篇 |
1990年 | 1118篇 |
1989年 | 1039篇 |
1988年 | 917篇 |
1987年 | 914篇 |
1986年 | 881篇 |
1985年 | 921篇 |
1984年 | 915篇 |
1983年 | 822篇 |
1982年 | 800篇 |
1979年 | 801篇 |
1978年 | 812篇 |
1977年 | 806篇 |
1976年 | 919篇 |
1975年 | 812篇 |
1974年 | 844篇 |
1973年 | 847篇 |
1972年 | 752篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
V. Yu. Ponomarev P. F. Bortignon R. A. Broglia V. V. Voronov 《Zeitschrift für Physik A Hadrons and Nuclei》1987,356(3):251-254
Damping width of the double giant dipole resonance of 136Xe excited in relativistic heavy ion collisions is calculated by diagonalizing a microscopic Hamiltonian in a basis containing one-, two- and three-phonon states. The coupling between these states is determined making use of the fermion structure of the phonons. The resulting width of the double giant dipole resonance is close to \(\left( {3_1^ + } \right)\) times the width of the single giant dipole resonance. 相似文献
992.
993.
A generalization of the Heisenberg XXZ model to the case of arbitrary spin with anisotropy of light-plane type is investigated. The base state of the system, the spectrum of excitations over it, and their scattering matrix are found. The magnetic susceptibility of the model for small magnetic fields and the low-temperature heat capacity are computed.Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova AN SSSR, Vol. 145, pp. 109–133, 1985. 相似文献
994.
995.
We have successfully developed a new one-pot solution-phase route, namely microwave-assisted hydrothermal reduction/carbonization (MAHRC), for a rapid synthesis of coaxial Ag/C nanocables. The nanocables can self-assemble in situ in an end-to-end fashion into interconnected chains. 相似文献
996.
997.
998.
The problem of the temporal and spatial dependences of the parameters of the action of a modulated fast-electron beam on a dense gas is posed on the basis of the transport equation. The problem is simplified by making it nondimensional and by transforming to the Fokker-Planck approximation. A Green's function formalism is developed for this problem and is used to express the solution of the general nonstationary problem in the form of a convolution of a nonstationary boundary flow with a stationary Green's function. The use of the derived equation is illustrated using as an example the solution of a problem with the simplest stationary Green's function corresponding to the straight-ahead approximation. This approximation is used to consider a general relativistic case with model scattering cross sections. The methods and results of a numerical computer solution of the nonstationary problem of electron retardation in the upper layer of the atmosphere are surveyed.Translated from Trudy Ordena Lenina Fizicheskogo Instituta im. P. N. Lebedeva AN SSSR, Vol. 145, pp. 172–188, 1984. 相似文献
999.
1000.
V. Yu. Filinovskii 《Russian Journal of Electrochemistry》2006,42(12):1319-1324
Identity of mathematical problems concerning calculation of the distribution of reactants’ concentrations and the current near the surface of a nonuniform (strip) electrode and distribution of displacements and forces in the case of an elastic layer “antiplane” deformation caused by the punch action. Formulas for calculating the current at a strip electrode are derived for various ratios between the electrode width and the diffusion layer thickness by means of asymptotic methods designed for calculating problems of mechanical contact interactions. It is noted that calculations of the diffusion current for involved activity distributions at the electrode surface may benefit from asymptotic methods of mechanics of contact interactions. 相似文献