全文获取类型
收费全文 | 9360篇 |
免费 | 535篇 |
国内免费 | 1110篇 |
专业分类
化学 | 2335篇 |
晶体学 | 41篇 |
力学 | 675篇 |
综合类 | 88篇 |
数学 | 7014篇 |
物理学 | 852篇 |
出版年
2024年 | 12篇 |
2023年 | 102篇 |
2022年 | 90篇 |
2021年 | 144篇 |
2020年 | 251篇 |
2019年 | 257篇 |
2018年 | 220篇 |
2017年 | 293篇 |
2016年 | 289篇 |
2015年 | 236篇 |
2014年 | 397篇 |
2013年 | 818篇 |
2012年 | 500篇 |
2011年 | 492篇 |
2010年 | 390篇 |
2009年 | 600篇 |
2008年 | 619篇 |
2007年 | 615篇 |
2006年 | 482篇 |
2005年 | 441篇 |
2004年 | 392篇 |
2003年 | 359篇 |
2002年 | 300篇 |
2001年 | 262篇 |
2000年 | 262篇 |
1999年 | 241篇 |
1998年 | 254篇 |
1997年 | 230篇 |
1996年 | 195篇 |
1995年 | 146篇 |
1994年 | 132篇 |
1993年 | 111篇 |
1992年 | 113篇 |
1991年 | 74篇 |
1990年 | 68篇 |
1989年 | 50篇 |
1988年 | 53篇 |
1987年 | 49篇 |
1986年 | 55篇 |
1985年 | 52篇 |
1984年 | 47篇 |
1983年 | 29篇 |
1982年 | 41篇 |
1981年 | 31篇 |
1980年 | 50篇 |
1979年 | 42篇 |
1978年 | 32篇 |
1977年 | 28篇 |
1976年 | 35篇 |
1974年 | 8篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
71.
In the present paper, a new two-parameter inverted equation of state (EOS) is developed which is found to be working very
well in the high-pressure region. To check its success and validity, this EOS has been applied in a number of solids. The
computed volume compression is found to be in very good agreement with the experimental data in the whole range of pressure
in all the solids. The minimum and the maximum pressure range used in the present study is 0–320 kbar and 0–3000 kbar, respectively. 相似文献
72.
A. Truffert 《Annals of Operations Research》1991,30(1):115-156
The conditional expectation of integrands and random sets is the main tool of stochastic optimization. This work wishes to make up for the lack of real synthesis about this subject. We improve the existing hypothesis and simplify the corresponding proofs. In the convex case we especially study the problem of the exchange of conditional expectation and subdifferential operators. 相似文献
73.
Asymptotic methods for contact problems are expounded. Some typical integral equations are considered 相似文献
74.
JIN Lu 《数学年刊B辑(英文版)》2004,25(4):483-492
A unicity theorem concerning the total derivative for entire functions of several complex variables is proved. 相似文献
75.
Silvia Lorenzo-Freire José M. Alonso-Meijide Balbina Casas-Méndez Ruud Hendrickx 《European Journal of Operational Research》2007
Calleja et al. [Calleja, P., Borm, P., Hendrickx, R., 2005. Multi-issue allocation situations. European Journal of Operational Research 164, 730–747] introduced multi-issue allocation situations with awards. In this paper, we extend the classical model of cooperative games with transferable utility to the cooperative games with transferable utility and awards. We define a run-to-the-bank rule for cooperative games with transferable utility and awards and characterise it in terms of a property of balanced contributions. We apply our main result to bankruptcy problems and multi-issue allocation situations with awards. 相似文献
76.
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
77.
关于《一类奇异边值问题的正解》的注记 总被引:3,自引:0,他引:3
文[4]通过构造反例断言文[1]中定理的必要性证明有误,本文首先指出文[4] 的这个断言不正确,然后对文[4]中定理2.1作了本质性的改进. 相似文献
78.
An exponentially fitted special second-order finite difference method is presented for solving singularly perturbed two-point boundary value problems with the boundary layer at one end (left or right) point. A fitting factor is introduced in a tri-diagonal finite difference scheme and is obtained from the theory of singular perturbations. Thomas Algorithm is used to solve the system and its stability is investigated. To demonstrate the applicability of the method, we have solved several linear and non-linear problems. From the results, it is observed that the present method approximates the exact solution very well. 相似文献
79.
Veli B. Shakhmurov 《Journal of Mathematical Analysis and Applications》2007,327(2):1182-1201
The nonlocal boundary value problems for anisotropic partial differential-operator equations with a dependent coefficients are studied. The principal parts of the appropriate generated differential operators are nonself-adjoint. Several conditions for the maximal regularity and the fredholmness in Banach-valued Lp-spaces of these problems are given. These results permit us to establish that the inverse of corresponding differential operators belongs to Schatten q-class. Some spectral properties of the operators are investigated. In applications, the nonlocal BVP's for quasielliptic partial differential equations and for systems of quasielliptic equations on cylindrical domain are studied. 相似文献
80.
Gerhard Starke 《Numerische Mathematik》1997,78(1):103-117
Summary. The convergence rate of Krylov subspace methods for the solution of nonsymmetric systems of linear equations, such as GMRES
or FOM, is studied. Bounds on the convergence rate are presented which are based on the smallest real part of the field of
values of the coefficient matrix and of its inverse. Estimates for these quantities are available during the iteration from
the underlying Arnoldi process. It is shown how these bounds can be used to study the convergence properties, in particular,
the dependence on the mesh-size and on the size of the skew-symmetric part, for preconditioners for finite element discretizations
of nonsymmetric elliptic boundary value problems. This is illustrated for the hierarchical basis and multilevel preconditioners
which constitute popular preconditioning strategies for such problems.
Received May 3, 1996 相似文献