全文获取类型
收费全文 | 5990篇 |
免费 | 554篇 |
国内免费 | 463篇 |
专业分类
化学 | 232篇 |
晶体学 | 1篇 |
力学 | 968篇 |
综合类 | 136篇 |
数学 | 4692篇 |
物理学 | 978篇 |
出版年
2024年 | 9篇 |
2023年 | 52篇 |
2022年 | 55篇 |
2021年 | 63篇 |
2020年 | 138篇 |
2019年 | 116篇 |
2018年 | 133篇 |
2017年 | 176篇 |
2016年 | 145篇 |
2015年 | 122篇 |
2014年 | 279篇 |
2013年 | 462篇 |
2012年 | 228篇 |
2011年 | 433篇 |
2010年 | 305篇 |
2009年 | 357篇 |
2008年 | 412篇 |
2007年 | 371篇 |
2006年 | 357篇 |
2005年 | 323篇 |
2004年 | 266篇 |
2003年 | 286篇 |
2002年 | 252篇 |
2001年 | 197篇 |
2000年 | 187篇 |
1999年 | 188篇 |
1998年 | 196篇 |
1997年 | 161篇 |
1996年 | 111篇 |
1995年 | 92篇 |
1994年 | 90篇 |
1993年 | 61篇 |
1992年 | 49篇 |
1991年 | 34篇 |
1990年 | 39篇 |
1989年 | 21篇 |
1988年 | 24篇 |
1987年 | 25篇 |
1986年 | 22篇 |
1985年 | 17篇 |
1984年 | 28篇 |
1983年 | 11篇 |
1982年 | 25篇 |
1981年 | 21篇 |
1980年 | 14篇 |
1979年 | 7篇 |
1978年 | 12篇 |
1977年 | 7篇 |
1976年 | 6篇 |
1973年 | 6篇 |
排序方式: 共有7007条查询结果,搜索用时 15 毫秒
51.
M. I. Gil' 《Proceedings of the American Mathematical Society》2003,131(12):3737-3746
A linear operator in a separable Hilbert space is called a quasinormal one if it is a sum of a normal operator and a compact one. In the paper, bounds for the spectrum of quasinormal operators are established. In addition, the lower estimate for the spectral radius is derived. Under some restrictions, that estimate improves the well-known results. Applications to integral operators and matrices are discussed. Our results are new even in the finite-dimensional case.
52.
53.
We construct a multiplicative group structure in the class of integro-differential operators specific for a polydisk which was introduced by I. I. Bavrin. We indicate two applications of these operators to solution of functional equations. 相似文献
54.
王梦 《浙江大学学报(理学版)》2003,30(4):361-364
用旋转法结合Fourier估计以及Littlewood-Paley理论给出了乘积空间上带粗糙核的极大奇异积分算子的Lp有界性.证明了对于Ω∈Lq(Sn-1×Sm1),其中q>1,∫ sn-1Ω(x',y')dx'=0, y'∈Sm-1,∫ sm-1Ω(x',y')dy'=0, x'∈Sn-1,且b,h∈L∞(R1+),则积域上极大奇异积分算子T*(f)=supε1>0,ε2>0∫∫|u|>ε1|v|>ε2b(|u|)h (|v|)Ω(u',v')/|v|n|v|mf(x-u,y-v)dudv为Lp(Rn×Rm)有界,其中1<p<∞.从而改进了以往的结果. 相似文献
55.
On the basis of the hydrodynamic equations for nonlinear elastic-gravity waves beneath a solid ice cover and their Hamiltonian representation, a three-wave kinetic equation for the time evolution of the wave spectrum is formulated. The properties of the kernel of the kinetic integral describing the nonlinear interactions between wave triplets are investigated. An algorithm for numerically calculating the kinetic integral is developed. The rate of nonlinear energy transfer over the wave spectrum is estimated quantitatively and its most important characteristics are found. 相似文献
56.
B. Satco 《Journal of Mathematical Analysis and Applications》2007,332(2):919-933
Existence theorems and some properties of solutions set of three boundary value second order differential equations and inclusions in Banach spaces are obtained under Henstock, respectively Henstock-Kurzweil-Pettis integrability assumptions. Our results extend those obtained by Azzam, Castaing and Thibault in the Bochner integrability setting and in the Pettis integrability one. The continuity of the (unique) solution with respect to a parameter in the single-valued case is also studied. 相似文献
57.
Asymptotic methods for contact problems are expounded. Some typical integral equations are considered 相似文献
58.
本文得到Ω满足Dini型条件时,Marcinkiewicz积分交换子μΩ,b(f)的端点估计:|{x∈R~n:μΩ,b(f)(x)>λ}|≤c‖b‖BMO∫_(R~n)(|f(x)|)/λ(1+log+(|f(x)|)/λ)dx. 相似文献
59.
Alexander G. Ramm Alexandra B. Smirnova Angelo Favini 《Annali di Matematica Pura ed Applicata》2003,182(1):37-52
A nonlinear operator equation F(x)=0, F:H→H, in a Hilbert space is considered. Continuous Newton’s-type procedures based on a construction of a dynamical system with
the trajectory starting at some initial point x
0 and becoming asymptotically close to a solution of F(x)=0 as t→+∞ are discussed. Well-posed and ill-posed problems are investigated.
Received: June 29, 2001; in final form: February 26, 2002?Published online: February 20, 2003
This paper was finished when AGR was visiting Institute for Theoretical Physics, University of Giessen. The author thanks
DAAD for support 相似文献
60.