全文获取类型
收费全文 | 24196篇 |
免费 | 685篇 |
国内免费 | 751篇 |
专业分类
化学 | 4364篇 |
晶体学 | 863篇 |
力学 | 561篇 |
综合类 | 74篇 |
数学 | 16915篇 |
物理学 | 2855篇 |
出版年
2023年 | 84篇 |
2022年 | 216篇 |
2021年 | 171篇 |
2020年 | 175篇 |
2019年 | 592篇 |
2018年 | 657篇 |
2017年 | 428篇 |
2016年 | 379篇 |
2015年 | 381篇 |
2014年 | 791篇 |
2013年 | 1315篇 |
2012年 | 783篇 |
2011年 | 1544篇 |
2010年 | 1576篇 |
2009年 | 1824篇 |
2008年 | 1889篇 |
2007年 | 1862篇 |
2006年 | 1492篇 |
2005年 | 1052篇 |
2004年 | 1019篇 |
2003年 | 816篇 |
2002年 | 673篇 |
2001年 | 521篇 |
2000年 | 463篇 |
1999年 | 481篇 |
1998年 | 413篇 |
1997年 | 371篇 |
1996年 | 474篇 |
1995年 | 457篇 |
1994年 | 451篇 |
1993年 | 361篇 |
1992年 | 283篇 |
1991年 | 177篇 |
1990年 | 148篇 |
1989年 | 156篇 |
1988年 | 101篇 |
1987年 | 105篇 |
1986年 | 121篇 |
1985年 | 160篇 |
1984年 | 105篇 |
1983年 | 74篇 |
1982年 | 111篇 |
1981年 | 89篇 |
1980年 | 56篇 |
1979年 | 30篇 |
1978年 | 47篇 |
1977年 | 59篇 |
1976年 | 49篇 |
1975年 | 11篇 |
1974年 | 19篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
Zhaoyang Yin 《Monatshefte für Mathematik》2004,141(4):337-344
We prove under quite general assumptions the existence of a bounded positive solution to the semilinear Schrödinger equation in a two-dimensional exterior domain. 相似文献
32.
We prove the existence of solutions to nonlinear free boundary problem with singularities at given points. 相似文献
33.
C. Sparber J. A. Carrillo J. Dolbeault P. A. Markowich 《Monatshefte für Mathematik》2004,141(3):237-257
We analyze the long-time behavior of transport equations for a class of dissipative quantum systems with Fokker-planck type diffusion operator, subject to confining potentials of harmonic oscillator type. We establish the existence and uniqueness of a non-equilibrium steady state for the corresponding dynamics. Further, using a (classical) convex Sobolev inequality, we prove an optimal exponential rate of decay towards this state and additionally give precise dispersion estimates in those cases, where no stationary state exists. 相似文献
34.
Walter Benz 《Monatshefte für Mathematik》2004,141(1):1-10
The lines of euclidean and hyperbolic geometries are characterized as metric lines in the sense of Blumenthal–Menger, and the lines of spherical and elliptic geometry as periodic ones. In euclidean geometries there do not exist periodic lines. 相似文献
35.
Victor Bondarenko 《Bulletin des Sciences Mathématiques》2003,127(3):191-206
In present paper the parabolic equation solution is built. The construction is reduced to iterative procedure. And convergence of the latter is proven. 相似文献
36.
We investigate several versions of a cardinal characteristic defined by Frankiewicz. Vojtáš showed , and Blass showed . We show that all the versions coincide and that is greater than or equal to the splitting number. We prove the consistency of and of .
Received: 2 October 1996 / Revised version: 22 May 1997 相似文献
37.
Summary. We study a diffusion model of an interacting particles system with general drift and diffusion coefficients, and electrostatic
inter-particles repulsion. More precisely, the finite particle system is shown to be well defined thanks to recent results
on multivalued stochastic differential equations (see [2]), and then we consider the behaviour of this system when the number
of particles goes to infinity (through the empirical measure process). In the particular case of affine drift and constant diffusion coefficient,
we prove that a limiting measure-valued process exists and is the unique solution of a deterministic PDE. Our treatment of
the convergence problem (as ) is partly similar to that of T. Chan [3] and L.C.G. Rogers - Z. Shi [5], except we consider here a more general case allowing
collisions between particles, which leads to a second-order limiting PDE.
Received: 5 August 1996 / In revised form: 17 October 1996 相似文献
38.
J. Schropp 《Numerische Mathematik》1997,78(1):87-101
Summary. We use the qualitative properties of the solution flow of the gradient equation to compute a local minimum of a real-valued function . Under the regularity assumption of all equilibria we show a convergence result for bounded trajectories of a consistent,
strictly stable linear multistep method applied to the gradient equation. Moreover, we compare the asymptotic features of
the numerical and the exact solutions as done by Humphries, Stuart (1994) and Schropp (1995) for one-step methods. In the
case of -stable formulae this leads to an efficient solver for stiff minimization problems.
Received July 10, 1995 / Revised version received June 27, 1996 相似文献
39.
Dorina Mitrea Marius Mitrea Jill Pipher 《Journal of Fourier Analysis and Applications》1997,3(2):131-192
We study boundary value problems for the time-harmonic form of the Maxwell equations, as well as for other related systems
of equations, on arbitrary Lipschitz domains in the three-dimensional Euclidean space. The main goal is to develop the corresponding
theory for Lp-integrable bounday data for optimal values of p's. We also discuss a number of relevant applications in electromagnetic scattering. 相似文献
40.
The purpose of this paper is to give the Reid ``Roundabout Theorem' for quadratic functionals with general boundary conditions.
In particular, we describe the so-called coupled point and regularity condition introduced in [16] in terms of Riccati equation
solutions.
Accepted 27 February 1996 相似文献