全文获取类型
收费全文 | 10205篇 |
免费 | 477篇 |
国内免费 | 9篇 |
专业分类
化学 | 7288篇 |
晶体学 | 75篇 |
力学 | 316篇 |
数学 | 1375篇 |
物理学 | 1637篇 |
出版年
2023年 | 74篇 |
2022年 | 123篇 |
2021年 | 238篇 |
2020年 | 229篇 |
2019年 | 227篇 |
2018年 | 276篇 |
2017年 | 230篇 |
2016年 | 406篇 |
2015年 | 326篇 |
2014年 | 336篇 |
2013年 | 705篇 |
2012年 | 696篇 |
2011年 | 800篇 |
2010年 | 396篇 |
2009年 | 345篇 |
2008年 | 654篇 |
2007年 | 716篇 |
2006年 | 624篇 |
2005年 | 575篇 |
2004年 | 423篇 |
2003年 | 381篇 |
2002年 | 331篇 |
2001年 | 131篇 |
2000年 | 108篇 |
1999年 | 90篇 |
1998年 | 74篇 |
1997年 | 66篇 |
1996年 | 94篇 |
1995年 | 63篇 |
1994年 | 57篇 |
1993年 | 60篇 |
1992年 | 47篇 |
1991年 | 37篇 |
1990年 | 25篇 |
1989年 | 29篇 |
1988年 | 18篇 |
1987年 | 28篇 |
1985年 | 63篇 |
1984年 | 40篇 |
1983年 | 18篇 |
1982年 | 50篇 |
1981年 | 46篇 |
1980年 | 57篇 |
1979年 | 45篇 |
1978年 | 32篇 |
1977年 | 33篇 |
1976年 | 44篇 |
1975年 | 38篇 |
1974年 | 28篇 |
1973年 | 25篇 |
排序方式: 共有10000条查询结果,搜索用时 390 毫秒
21.
We introduce here some Itô calculus for non-continuous Dirichlet processes. Such calculus extends what was known for continuous Dirichlet processes or for semimartingales. In particular we prove that non-continuous Dirichlet processes are stable under C
1 transformation. 相似文献
22.
Olga V. Man’ko 《Acta Physica Hungarica A》2004,19(3-4):313-316
A short review of the general principles of constructing tomograms of spin and quark states is presented. 相似文献
23.
François Ledrappier Mark Pollicott 《Bulletin of the Brazilian Mathematical Society》2005,36(2):143-176
In this paper we study the ergodic properties of the linear action of lattices Γ of SL(2,ℚp) on ℚp × ℚp and distribution results for orbits of Γ. Following Serre, one can define a “geodesic flow” for an associated tree (actually
associated to GL(2,ℚp)). The approach we use is based on an extension of this approach to “frame flows” which are a natural compact group extension
of the geodesic flow. 相似文献
24.
Andrei Finkelstein Olga Kosheleva Vladik Kreinovich 《International Journal of Theoretical Physics》1997,36(4):1009-1020
Inimage processing (e.g., inastronomy), the desired black-and-white image is, from the mathematical viewpoint, aset. Hence, to process images, we need to process sets. To define a generic set, we need infinitely many parameters; therefore,
if we want to represent and process sets in the computer, we must restrict ourselves to finite-parameter families of sets
that will be used to approximate the desired sets. The wrong choice of a family can lead to longer computations and worse
approximation. Hence, it is desirable to find the family that it isthe best in some reasonable sense. In this paper, we show how the problems of choosing the optimal family of sets can be formalized
and solved. As a result of the described general methodology, forastronomical images, we get exactly the geometric shapes that have been empirically used by astronomers and astrophysicists; thus, we have atheoretical explanation for these shapes. 相似文献
25.
26.
Regina S. Burachik Rafail N. Gasimov Nergiz A. Ismayilova C. Yalçin. Kaya 《Journal of Global Optimization》2006,34(1):55-78
We study convergence properties of a modified subgradient algorithm, applied to the dual problem defined by the sharp augmented
Lagrangian. The primal problem we consider is nonconvex and nondifferentiable, with equality constraints. We obtain primal
and dual convergence results, as well as a condition for existence of a dual solution. Using a practical selection of the
step-size parameters, we demonstrate the algorithm and its advantages on test problems, including an integer programming and
an optimal control problem.
*Partially Supported by 2003 UniSA ITEE Small Research Grant Ero2.
Supported by CAPES, Brazil, Grant No. 0664-02/2, during her visit to the School of Mathematics and Statistics, UniSA. 相似文献
27.
Vladik Kreinovich Alejandro Vazquez Olga Kosheleva 《International Journal of Theoretical Physics》1991,30(2):113-122
It is proved that both the prediction problem and the problem of reconstructing the state from the observations in quantum mechanics are NP-hard. 相似文献
28.
Jean-François Burnol 《Annales Henri Poincare》2006,7(6):1013-1034
We study Hilbert space aspects of the Klein-Gordon equation in two-dimensional spacetime. We associate to its restriction
to a spacelike wedge a scattering from the past light cone to the future light cone, which is then shown to be (essentially)
the Hankel transform of order zero. We apply this to give a novel proof, solely based on the causality of this spatio-temporal
wave propagation, of the theorem of de Branges and V. Rovnyak concerning Hankel pairs with a support property. We recover
their isometric expansion as an application of Riemann’s general method for solving Cauchy-Goursat problems of hyperbolic
type.
Communicated by Vincent Rivasseau
Submitted: October 28, 2005; Accepted: February 17, 2006 相似文献
29.
Francois NICOLEAU 《数学学报(英文版)》2006,22(5):1485-1492
We consider a pair of Hamiltonians (H, H0) on L2(R^n), where H0=p^2 -x^2 is a SchrSdinger operator with a repulsive potential, and H = H0+V(x). We show that, under suitable assumptions on the decay of the electric potential, V is uniquely determined by the high energy limit of the scattering operator. 相似文献
30.
Some curvature conditions about the geodesics emanating from a submanifold are obtained. These conditions are used to to study the topological and geometric properties of the ambient spaces which admit some minimal submanifolds. 相似文献