全文获取类型
收费全文 | 1823篇 |
免费 | 130篇 |
国内免费 | 165篇 |
专业分类
化学 | 54篇 |
力学 | 244篇 |
综合类 | 56篇 |
数学 | 1529篇 |
物理学 | 235篇 |
出版年
2024年 | 2篇 |
2023年 | 18篇 |
2022年 | 14篇 |
2021年 | 28篇 |
2020年 | 32篇 |
2019年 | 41篇 |
2018年 | 34篇 |
2017年 | 51篇 |
2016年 | 46篇 |
2015年 | 48篇 |
2014年 | 94篇 |
2013年 | 92篇 |
2012年 | 67篇 |
2011年 | 111篇 |
2010年 | 97篇 |
2009年 | 107篇 |
2008年 | 117篇 |
2007年 | 121篇 |
2006年 | 123篇 |
2005年 | 127篇 |
2004年 | 73篇 |
2003年 | 79篇 |
2002年 | 82篇 |
2001年 | 80篇 |
2000年 | 68篇 |
1999年 | 68篇 |
1998年 | 41篇 |
1997年 | 52篇 |
1996年 | 45篇 |
1995年 | 37篇 |
1994年 | 28篇 |
1993年 | 21篇 |
1992年 | 14篇 |
1991年 | 5篇 |
1990年 | 13篇 |
1989年 | 4篇 |
1988年 | 4篇 |
1987年 | 4篇 |
1986年 | 7篇 |
1985年 | 4篇 |
1984年 | 6篇 |
1983年 | 3篇 |
1981年 | 1篇 |
1980年 | 3篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 2篇 |
1973年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有2118条查询结果,搜索用时 15 毫秒
61.
62.
梁军 《数学的实践与认识》2016,(17):229-235
采用重心Lagrange插值配点法计算了二维Poisson方程.采用重心Lagrange插值法构造近似函数,由配点法离散Poisson方程及其边界条件.数值算例表明方法具有理论简单、计算精度高的特点. 相似文献
63.
Constrained moving least‐squares immersed boundary method for fluid‐structure interaction analysis 下载免费PDF全文
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
64.
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
65.
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
66.
67.
A systematic treatment of multilinear Calderón-Zygmund operators is presented. The theory developed includes strong type and endpoint weak type estimates, interpolation, a multilinear T1 theorem, and a variety of results regarding multilinear multiplier operators. 相似文献
68.
In this paper we present an algorithm for recursively generating orthogonal bivariate polynomials on a discrete set S 2. For this purpose we employ commuting pairs of real symmetric matrices H, K
n×n
to obtain, in a certain sense, a two dimensional Hermitian Lanczos method. The resulting algorithm relies on a recurrence having a slowly growing length. Practical implementation issues an applications are considered. The method can be generalized to compute orthogonal polynomials depending on an arbitrary number of variables. 相似文献
69.
Emil Žagar 《BIT Numerical Mathematics》2002,42(3):670-688
In this paper the problem of G
2 continuous interpolation of curves in
d
by polynomial splines of degree n is studied. The interpolation of the data points and two tangent directions at the boundary is considered. The case n = r + 2 = d, where r is the number of interior points interpolated by each segment of the spline curve, is studied in detail. It is shown that the problem is uniquely solvable asymptotically, e., when the data points are sampled regularly and sufficiently dense, and lie on a regular, convex parametric curve in
d
. In this case the optimal approximation order is also determined. 相似文献
70.