全文获取类型
收费全文 | 356420篇 |
免费 | 2394篇 |
国内免费 | 640篇 |
专业分类
化学 | 170609篇 |
晶体学 | 5428篇 |
力学 | 18532篇 |
综合类 | 9篇 |
数学 | 52570篇 |
物理学 | 112306篇 |
出版年
2019年 | 2292篇 |
2018年 | 11089篇 |
2017年 | 11872篇 |
2016年 | 8212篇 |
2015年 | 3412篇 |
2014年 | 4392篇 |
2013年 | 10791篇 |
2012年 | 12051篇 |
2011年 | 21178篇 |
2010年 | 13579篇 |
2009年 | 13470篇 |
2008年 | 18868篇 |
2007年 | 22231篇 |
2006年 | 9065篇 |
2005年 | 13940篇 |
2004年 | 10453篇 |
2003年 | 9881篇 |
2002年 | 7955篇 |
2001年 | 7482篇 |
2000年 | 5976篇 |
1999年 | 4401篇 |
1998年 | 3903篇 |
1997年 | 3871篇 |
1996年 | 3765篇 |
1995年 | 3438篇 |
1994年 | 3585篇 |
1993年 | 3280篇 |
1992年 | 3736篇 |
1991年 | 3746篇 |
1990年 | 3677篇 |
1989年 | 3552篇 |
1988年 | 3660篇 |
1987年 | 3549篇 |
1986年 | 3364篇 |
1985年 | 4449篇 |
1984年 | 4746篇 |
1983年 | 3963篇 |
1982年 | 4096篇 |
1981年 | 4018篇 |
1980年 | 3993篇 |
1979年 | 3981篇 |
1978年 | 4299篇 |
1977年 | 4147篇 |
1976年 | 4232篇 |
1975年 | 3903篇 |
1974年 | 3943篇 |
1973年 | 4134篇 |
1972年 | 2887篇 |
1971年 | 2405篇 |
1970年 | 2206篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Yu. K. Dem’yanovich 《Journal of Mathematical Sciences》2007,144(6):4548-4567
On a sequence of embedded nonuniform grids, chains of embedded spaces of minimal splines (not necessarily polynomial) are
constructed. The wavelet decomposition is given. The basis wavelets are compactly supported and admit simple analytic representation.
The corresponding decomposition and reconstruction formulas are derived. The variety of spaces under consideration is identified
with the variety of complete sequences of points of the direct product of an interval and a projective plane. Bibliography:
20 titles.
__________
Translated from Problemy Matematicheskogo Analiza, No. 35, 2007, pp. 15–31 相似文献
992.
993.
In this paper we consider a class of nonlinear delay partial difference equations and a class of linear delay partial difference equations with variable coefficients, which may change sign. We obtain oscillation criteria for these equations. There are no results for the oscillation of these equations up to now. 相似文献
994.
A base of the universal multiplicative envelope of the free Malcev superalgebra ℳ on one odd generator is constructed. Some
corollaries for skew-symmetric functions and central elements in free Malcev and free alternative algebras are obtained. Moreover,
a base of the Poisson-Malcev superalgebra of ℳ is constructed. As a corollary, a set of elements that spans the free alternative
superalgebra on one odd generator is obtained.
__________
Translated from Fundamentalnaya i Prikladnaya Matematika, Vol. 10, No. 4, pp. 97–106, 2004. 相似文献
995.
996.
It is demonstrated theoretically that the initial (both elastic and viscous) magnetic susceptibility components for nanocrystalline
magnets caused by the processes of rotations (in the region of linear response) have resonant rather than relaxation character
typical already for the susceptibility component caused by displacements of domain boundaries.
__________
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 88–92, June, 2007. 相似文献
997.
998.
A. S. Parshin G. A. Aleksandrova S. N. Varnakov S. A. Kushchenkov S. G. Ovchinnikov 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2007,1(4):462-465
The results of studying Fe/Si and Si/Fe layered structures with different thicknesses of the top layer by reflected electron energy loss spectroscopy are presented. A new method is proposed for the estimation of volume fractions of components in binary systems within the framework of the effective dielectric medium model. 相似文献
999.
P. V. Ivannikov N. S. Chekalin P. A. Miroshnikov G. V. Saparin A. A. Altukhov A. V. Shustrov 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2007,1(4):386-393
Surfaces of natural type-IIa diamond plates used in ionizing-radiation detectors are studied in a scanning electron microscope using techniques of electron-beam-induced conductivity at different bias voltages and real-color cathodoluminescence. 相似文献
1000.
V. M. Arzhavitin 《Technical Physics》2003,48(6):797-799
The stressed state of in metallic composite systems is analyzed. It is analytically shown that the temperature dependences of the internal friction in the composites may have extrema that are caused by internal stresses. The analytical results are supported by the experimental temperature dependences of the internal friction in (Cu-13% Sn)-30% Nb and Cu-1.3% Cr composites. 相似文献