全文获取类型
收费全文 | 4330篇 |
免费 | 216篇 |
国内免费 | 318篇 |
专业分类
化学 | 322篇 |
晶体学 | 2篇 |
力学 | 432篇 |
综合类 | 79篇 |
数学 | 3254篇 |
物理学 | 775篇 |
出版年
2024年 | 7篇 |
2023年 | 46篇 |
2022年 | 44篇 |
2021年 | 70篇 |
2020年 | 84篇 |
2019年 | 106篇 |
2018年 | 88篇 |
2017年 | 107篇 |
2016年 | 91篇 |
2015年 | 98篇 |
2014年 | 222篇 |
2013年 | 400篇 |
2012年 | 181篇 |
2011年 | 257篇 |
2010年 | 236篇 |
2009年 | 297篇 |
2008年 | 314篇 |
2007年 | 279篇 |
2006年 | 228篇 |
2005年 | 259篇 |
2004年 | 170篇 |
2003年 | 170篇 |
2002年 | 151篇 |
2001年 | 132篇 |
2000年 | 125篇 |
1999年 | 107篇 |
1998年 | 82篇 |
1997年 | 87篇 |
1996年 | 83篇 |
1995年 | 66篇 |
1994年 | 58篇 |
1993年 | 49篇 |
1992年 | 25篇 |
1991年 | 14篇 |
1990年 | 21篇 |
1989年 | 10篇 |
1988年 | 10篇 |
1987年 | 16篇 |
1986年 | 17篇 |
1985年 | 8篇 |
1984年 | 13篇 |
1983年 | 7篇 |
1982年 | 5篇 |
1981年 | 5篇 |
1980年 | 6篇 |
1979年 | 2篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1973年 | 2篇 |
1970年 | 2篇 |
排序方式: 共有4864条查询结果,搜索用时 31 毫秒
161.
Constrained moving least‐squares immersed boundary method for fluid‐structure interaction analysis
下载免费PDF全文
![点击此处可从《国际流体数值方法杂志》网站下载免费的PDF全文](/ch/ext_images/free.gif)
A numerical method is presented for the analysis of interactions of inviscid and compressible flows with arbitrarily shaped stationary or moving rigid solids. The fluid equations are solved on a fixed rectangular Cartesian grid by using a higher‐order finite difference method based on the fifth‐order WENO scheme. A constrained moving least‐squares sharp interface method is proposed to enforce the Neumann‐type boundary conditions on the fluid‐solid interface by using a penalty term, while the Dirichlet boundary conditions are directly enforced. The solution of the fluid flow and the solid motion equations is advanced in time by staggerly using, respectively, the third‐order Runge‐Kutta and the implicit Newmark integration schemes. The stability and the robustness of the proposed method have been demonstrated by analyzing 5 challenging problems. For these problems, the numerical results have been found to agree well with their analytical and numerical solutions available in the literature. Effects of the support domain size and values assigned to the penalty parameter on the stability and the accuracy of the present method are also discussed. 相似文献
162.
163.
In this paper we study spectral sets which are unions of finitely many intervals in R. We show that any spectrum associated with such a spectral set Ω is periodic, with the period an integral multiple of the measure of Ω. As a consequence we get a structure theorem for such spectral sets and observe that the generic case is that of the equal interval case. 相似文献
164.
Two soluble isomerized polyimides(PIs)synthesized from 2,2′-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride(6FDA)with either 2,2′-dimethylbenzidine(2,2′-DMB)or 3,3′-DMB were investigated by means... 相似文献
165.
Divergence-free wavelets are successfully applied to numerical solutions of Navier-Stokes equation and to analysis of incompressible
flows. They closely depend on a pair of one-dimensional wavelets with some differential relations. In this paper, we point
out some restrictions of those wavelets and study scaling functions with the differential relation; Wavelets and their duals
are discussed; In addition to the differential relation, we are particularly interested in a class of examples with the interpolatory
property; It turns out there is a connection between our examples and Micchelli’s work. 相似文献
166.
Based on the low-order conforming finite element subspace (Vh, Mh) such as the P1-P0 triangle element or the Q1-P0 quadrilateral element, the locally stabilized finite element method for the Stokes problem with nonlinear slip boundary conditions is investigated in this paper. For this class of nonlinear slip boundary conditions including the subdifferential property, the weak variational formulation associated with the Stokes problem is an variational inequality. Since (Vh, Mh) does not satisfy the discrete inf-sup conditions, a macroelement condition is introduced for constructing the locally stabilized formulation such that the stability of (Vh, Mh) is established. Under these conditions, we obtain the H1 and L2 error estimates for the numerical solutions. 相似文献
167.
In this note, we investigate some properties of local Kneser graphs defined in [János Körner, Concetta Pilotto, Gábor Simonyi, Local chromatic number and sperner capacity, J. Combin. Theory Ser. B 95 (1) (2005) 101-117]. In this regard, as a generalization of the Erdös-Ko-Rado theorem, we characterize the maximum independent sets of local Kneser graphs. Next, we provide an upper bound for their chromatic number. 相似文献
168.
J.S. Lee M. Ortolani J. Kouba A. Firsov Y.J. Chang T.W. Noh U. Schade 《Infrared Physics & Technology》2008,51(5):443-445
We investigated the effect of an electric-pulse on the insulator–metal phase transition of VO2/Al2O3 films using synchrotron-based infrared microspectroscopy. By monitoring the time-resolved optical response, we could demonstrate that local conducting areas are formed under the influence of the electric-pulse, and the Joule heat generated from the local current flow drives a consecutive thermal phase transition in the adjacent sample area. 相似文献
169.
Mihai Mari 《Journal de Mathématiques Pures et Appliquées》2002,81(12):109-1239
We are interested in the existence of travelling-waves for the nonlinear Schrödinger equation in RN with “ψ3−ψ5”-type nonlinearity. First, we prove an abstract result in critical point theory (a local variant of the classical saddle-point theorem). Using this result, we get the existence of travelling-waves moving with sufficiently small velocity in space dimension N4. 相似文献
170.