全文获取类型
收费全文 | 16922篇 |
免费 | 1567篇 |
国内免费 | 1799篇 |
专业分类
化学 | 357篇 |
晶体学 | 3篇 |
力学 | 1689篇 |
综合类 | 353篇 |
数学 | 15237篇 |
物理学 | 2649篇 |
出版年
2024年 | 27篇 |
2023年 | 164篇 |
2022年 | 164篇 |
2021年 | 218篇 |
2020年 | 368篇 |
2019年 | 411篇 |
2018年 | 428篇 |
2017年 | 510篇 |
2016年 | 498篇 |
2015年 | 359篇 |
2014年 | 765篇 |
2013年 | 1292篇 |
2012年 | 682篇 |
2011年 | 1003篇 |
2010年 | 883篇 |
2009年 | 1127篇 |
2008年 | 1178篇 |
2007年 | 1213篇 |
2006年 | 1082篇 |
2005年 | 951篇 |
2004年 | 800篇 |
2003年 | 872篇 |
2002年 | 817篇 |
2001年 | 579篇 |
2000年 | 599篇 |
1999年 | 565篇 |
1998年 | 536篇 |
1997年 | 484篇 |
1996年 | 327篇 |
1995年 | 208篇 |
1994年 | 182篇 |
1993年 | 132篇 |
1992年 | 120篇 |
1991年 | 90篇 |
1990年 | 79篇 |
1989年 | 51篇 |
1988年 | 53篇 |
1987年 | 49篇 |
1986年 | 37篇 |
1985年 | 46篇 |
1984年 | 64篇 |
1983年 | 28篇 |
1982年 | 59篇 |
1981年 | 40篇 |
1980年 | 39篇 |
1979年 | 23篇 |
1978年 | 23篇 |
1977年 | 15篇 |
1976年 | 16篇 |
1973年 | 8篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
We study problems of interpolation of positive linear operators in couples of ordered Banach spaces. From this viewpoint, we study couples of noncommutative spaces L 1, L ∞ associated with weights and traces on von Neumann algebras. 相似文献
42.
43.
Yang Zuosheng 《国际流体数值方法杂志》2005,47(12):1423-1430
A complete boundary integral formulation for compressible Navier–Stokes equations with time discretization by operator splitting is developed using the fundamental solutions of the Helmholtz operator equation with different order. The numerical results for wall pressure and wall skin friction of two‐dimensional compressible laminar viscous flow around airfoils are in good agreement with field numerical methods. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
44.
K. V. Storozhuk 《Proceedings of the American Mathematical Society》2007,135(6):1861-1863
We give a short proof of a generalization of the Rolewicz theorem based on the uniform boundedness principle.
45.
J. MALINEN O. NEVANLINNA V. TURUNEN Z. YUAN 《数学学报(英文版)》2007,23(4):745-748
Let T be a bounded linear operator in a Banach space, with σ(T)={1}. In 1983, Esterle-Berkani' s conjecture was proposed for the decay of differences (I - T) T^n as follows: Eitheror lim inf (n→∞(n+1)||(I-T)T^n||≥1/e or T = I. We prove this claim and discuss some of its consequences. 相似文献
46.
47.
In this paper, we consider questions related to the structure of inverse matrices of linear bounded operators acting in infinite-dimensional complex Banach spaces. We obtain specific estimates of elements of inverse matrices for bounded operators whose matrices have a special structure. Matrices are introduced as special operator-valued functions on an index set. The matrix structure is described by the behavior of the given function on elements of a special partition of the index set. The method used for deriving the estimates is based on an analysis of Fourier series of strongly continuous periodic functions. 相似文献
48.
关于多线性振荡奇异积分在加权Hardy-型空间上的一致估计 总被引:1,自引:0,他引:1
本文对一类具有光滑位相函数的多线性振荡奇异积分算子建立了一致的加权(H^1(R^n),L^1(R^n))估计及一致的加权(HKp(R^n),Kp(R^n)估计。 相似文献
49.
Daniel Maerten 《Annals of Global Analysis and Geometry》2007,32(4):391-414
We prove a Penrose-like inequality for the mass of a large class of constant mean curvature (CMC) asymptotically flat n-dimensional spin manifolds which satisfy the dominant energy condition and have a future converging, or past converging compact
and connected boundary of non-positive mean curvature and of positive Yamabe invariant. We prove that for every n ≥ 3 the mass is bounded from below by an expression involving the norm of the linear momentum, the volume of the boundary,
dimensionless geometric constants and some normalized Sobolev ratio. 相似文献
50.
In an earlier paper on a malignant cell invasion model (Marchantet al., SIAM J. Appl. Math, 60, 2000) we introduced a novelform of discontinuous travelling wave solution. These solutionscould be studied easily by combining behaviour within a phaseplane with the RankineHugoniot shock conditions, whichdescribe properties (such as the ratio of the jump discontinuitiesto the speed of propagation) that solutions may possess. Theseresults were new for several reasons. The shock conditions relateto hyperbolic equations (which the model is) but were appliedin a travelling wave ordinary differential equation phase planeusing techniques that usually apply to parabolic reactiondiffusionsystems. In addition the solutions possess singular behaviournear several points in the phase plane but in spite of thisthere exists a robust and stable family of physically interestingsolutions. In this paper we discuss two previously studied models, oneof detonation theory and one of angiogenesis. We show that eachof these models also possesses a family of discontinuous travellingwave solutions which was not previously discovered. Of particularinterest is the solution which has a blunt interface at thefront of the invading profile. In all three models it is thissolution that is seen to stably evolve from physically relevantinitial data, and for physically relevant parameter values. This work confirms the robustness of these novel travellingwave solutions and their applicability to a wider range of mathematicalmodelling situations. 相似文献