全文获取类型
收费全文 | 472篇 |
免费 | 16篇 |
国内免费 | 24篇 |
专业分类
化学 | 23篇 |
晶体学 | 6篇 |
力学 | 103篇 |
综合类 | 4篇 |
数学 | 316篇 |
物理学 | 60篇 |
出版年
2024年 | 1篇 |
2023年 | 3篇 |
2022年 | 3篇 |
2021年 | 6篇 |
2020年 | 3篇 |
2019年 | 5篇 |
2018年 | 8篇 |
2017年 | 8篇 |
2016年 | 19篇 |
2015年 | 7篇 |
2014年 | 9篇 |
2013年 | 56篇 |
2012年 | 14篇 |
2011年 | 16篇 |
2010年 | 20篇 |
2009年 | 39篇 |
2008年 | 28篇 |
2007年 | 39篇 |
2006年 | 21篇 |
2005年 | 25篇 |
2004年 | 24篇 |
2003年 | 26篇 |
2002年 | 23篇 |
2001年 | 12篇 |
2000年 | 8篇 |
1999年 | 19篇 |
1998年 | 11篇 |
1997年 | 15篇 |
1996年 | 6篇 |
1995年 | 6篇 |
1994年 | 7篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1990年 | 5篇 |
1989年 | 4篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1982年 | 1篇 |
1981年 | 2篇 |
排序方式: 共有512条查询结果,搜索用时 15 毫秒
441.
Xanthippi Markenscoff 《Journal of Elasticity》1997,49(2):163-166
It is shown, based on properties of analytic functions, that for inclusions of constant eigenstrain and eigenstress that the
shape of the inclusion is restricted and any part of a plane (i.e. polyhedral inclusion) is prohibited.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
442.
The bifurcation instability problem for shells of revolution made of particulate composites with nonlinear elastic inclusions
and damageable matrix is formulated and solved
__________
Translated from Prikladnaya Mekhanika, Vol. 43, No. 11, pp. 55–65, November 2007. 相似文献
443.
在Banach空间中研究了一类广义集值变分包含解的存在性及其逼近问题.所得结果没有假设空间是一致光滑的,因此改进和推广了[1]的结果. 相似文献
444.
Pedro Ponte Castañeda 《Journal of the mechanics and physics of solids》2002,50(4):737-757
This paper is concerned with the development of an improved second-order homogenization method incorporating field fluctuations for nonlinear composite materials. The idea is to combine the desirable features of two different, earlier methods making use of “linear comparison composites”, the properties of which are chosen optimally from suitably designed variational principles. The first method (Ponte Castañeda, J. Mech. Phys. Solids 39 (1991) 45) makes use of the “secant” moduli of the phases, evaluated at the second moments of the strain field over the phases, and delivers bounds, but these bounds are only exact to first-order in the heterogeneity contrast. The second method (Ponte Castañeda, J. Mech. Phys. Solids 44 (1996) 827) makes use of the “tangent” moduli, evaluated at the phase averages (or first moments) of the strain field, and yields estimates that are exact to second-order in the contrast, but that can violate the bounds in some special cases. These special cases turn out to correspond to situations, such as percolation phenomena, where field fluctuations, which are captured less accurately by the second-order method than by the bounds, become important. The new method delivers estimates that are exact to second-order in the contrast, making use of generalized secant moduli incorporating both first- and second-moment information, in such a way that the bounds are never violated. Some simple applications of the new theory are given in Part II of this work. 相似文献
445.
Gonzalo Alduncin 《Numerical Functional Analysis & Optimization》2013,34(3):305-328
Optimal control of nonlinear transport-flow mixed variational problems are studied qualitatively, and the solvability analysis of the transport and flow mixed state systems is performed on the basis of primal and dual evolution duality principles. Corresponding primal and dual mixed optimality conditions are established by the application of some fundamental perturbation conjugate duality results recently proposed [8]. Further, for computational purposes, two- and three-field proximation penalty-duality algorithms in the resolution of the mixed optimality conditions are finally presented and discussed. 相似文献
446.
The paper deals with a finite element approximation of elliptic and parabolic variational inequalities. Elliptic hemivariational inequalities are equivalently expressed as a system consisting of one equation and one inclusion for a couple of unknowns, namely a primal variable u and an element belonging to a multivalued mapping at u. Both components of the solution are approximated independently each other by a finite element method. Parabolic inequalities are transformed into a system of elliptic ones by using an appropriate time discretization. A numerical experiment is realized by using non-smooth optimization methods. 相似文献
447.
《Communications in Nonlinear Science & Numerical Simulation》2014,19(5):1279-1300
In this paper, we formulate and investigate a class of memristor-based BAM neural networks with time-varying delays. Under the framework of Filippov solutions, the viability and dissipativity of solutions for functional differential inclusions and memristive BAM neural networks can be guaranteed by the matrix measure approach and generalized Halanay inequalities. Then, a new method involving the application of set-valued version of Krasnoselskii’ fixed point theorem in a cone is successfully employed to derive the existence of the positive periodic solution. The dynamic analysis in this paper utilizes the theory of set-valued maps and functional differential equations with discontinuous right-hand sides of Filippov type. The obtained results extend and improve some previous works on conventional BAM neural networks. Finally, numerical examples are given to demonstrate the theoretical results via computer simulations. 相似文献
448.
Lai-Jiu Lin 《Journal of Global Optimization》2007,39(4):509-527
In this paper, we prove the existence theorems of two types of systems of variational inclusions problem. From these existence
results, we establish Ekeland’s variational principle on topological vector space, existence theorems of common fixed point,
existence theorems for the semi-infinite problems, mathematical programs with fixed points and equilibrium constraints, and
vector mathematical programs with variational inclusions constraints. 相似文献
449.
本文在可分Banach空间中研究带线性分离边值条件的二阶微分包含,在较弱的条件下证明了解的存在性,由此可以得到二阶微分方程的边值问题若干解的存在性定理的推广形式. 相似文献
450.
This paper discusses a simple model of electromagnetically stirred molten metal within a long cylinder, neglecting end effects. The radially‐dependent velocity profiles of the molten metal are calculated using the Prandtl mixing length model for turbulence. The paths of non‐conducting particles within the fluid are also computed numerically, under the influence of Stokes’ drag and a random force due to turbulence. The paths are calculated for a range of particle diameters and the general motion is observed. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献