全文获取类型
收费全文 | 208篇 |
免费 | 20篇 |
国内免费 | 13篇 |
专业分类
化学 | 7篇 |
晶体学 | 1篇 |
力学 | 12篇 |
综合类 | 14篇 |
数学 | 190篇 |
物理学 | 17篇 |
出版年
2023年 | 1篇 |
2022年 | 4篇 |
2021年 | 9篇 |
2020年 | 4篇 |
2019年 | 8篇 |
2018年 | 1篇 |
2017年 | 6篇 |
2016年 | 4篇 |
2015年 | 3篇 |
2014年 | 16篇 |
2013年 | 15篇 |
2012年 | 6篇 |
2011年 | 19篇 |
2010年 | 12篇 |
2009年 | 15篇 |
2008年 | 11篇 |
2007年 | 9篇 |
2006年 | 8篇 |
2005年 | 6篇 |
2004年 | 5篇 |
2003年 | 12篇 |
2002年 | 6篇 |
2001年 | 7篇 |
2000年 | 10篇 |
1999年 | 5篇 |
1998年 | 7篇 |
1997年 | 9篇 |
1996年 | 4篇 |
1995年 | 3篇 |
1994年 | 4篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1982年 | 2篇 |
1979年 | 2篇 |
1977年 | 1篇 |
排序方式: 共有241条查询结果,搜索用时 0 毫秒
1.
利用严格对角占优M-矩阵的逆矩阵的无穷大范数的范围,给出了B-矩阵线性互补问题误差界新的估计式.相应数值算例表明了结果的有效性. 相似文献
2.
基于加速度响应控制时MTMD的地震特性 总被引:1,自引:0,他引:1
研究了由多个刚度和阻尼保持为常量且频率呈线性分布的TMD形成的MTMD的地震特性。基于虚拟激励法和Kanai Tajimi及Clough Penzien地震谱 ,建立了结构 MTMD系统的加速度传递函数 ,进而导出了设置MTMD时结构的加速度动力放大系数 (ADMF)明确表达式。于是MTMD的优化准则选择为 :结构最大加速度动力放大系数的最小值的最小化 [Min .Min .Max .ADMF]。通过最优搜寻得MTMD的最优频率间隔、平均阻尼比、调谐频率比和相应的控制有效性指标。选择结构受控频率与地震卓越频率比的不同取值 ,研究地震卓越频率对MTMD最优参数及有效性的影响 相似文献
3.
In static and dynamic analysis of a large complex structure, one may merely be interested in the stresses and displacements
at some important locations. A new solution technique for structural analysis with FEM is proposed in this paper by which
those important unknowns are separated from the rest. In static analysis the important unknows can be found directly. In dynamic
analysis all mass and exciting forces can be condensed onto a small number of predetermined points in order to make the dynamic
analysis much simplified. A large scale problem can be solved with a small capacity computer quickly. 相似文献
4.
5.
是以机器人及其安全系统所构成的一个可修复系统作为研究对象,运用泛函分析方法并结合C_0半群理论,证明了严格占优本征值在本系统的存在性并且是系统严格占优本征值,进一步证明了在一定条件下,系统的动态解以指数化形式收敛于系统的稳态解. 相似文献
6.
讨论用块三对角线性方程组的可扩展并行算法,求解带Dirichlet边界条件的一阶二维双曲型方程初边值问题。用本文方法在上海大学超级计算机"自强3000"上进行数值实验,实验结果与理论分析一致。在保证精度的前提下,得到线性加速比,并行效率达到90%以上。 相似文献
7.
It is known that the diagonal-Schur complements of strictly diagonally dominant matrices are strictly diagonally dominant matrices [J.Z. Liu, Y.Q. Huang, Some properties on Schur complements of H-matrices and diagonally dominant matrices, Linear Algebra Appl. 389 (2004) 365-380], and the same is true for nonsingular H-matrices [J.Z. Liu, J.C. Li, Z.T. Huang, X. Kong, Some properties of Schur complements and diagonal-Schur complements of diagonally dominant matrices, Linear Algebra Appl. 428 (2008) 1009-1030]. In this paper, we research the properties on diagonal-Schur complements of block diagonally dominant matrices and prove that the diagonal-Schur complements of block strictly diagonally dominant matrices are block strictly diagonally dominant matrices, and the same holds for generalized block strictly diagonally dominant matrices. 相似文献
8.
Xiangjian Xu 《Applied mathematics and computation》2010,217(5):1944-1948
In this paper, we present a fast algorithm for solving Symmetric penta-diagonal systems. We give the feasibility and Stability analysis of the algorithm. Moreover, parallel computations can be implemented in the algorithm. The numerical examples verify the efficiency of the algorithm. 相似文献
9.
In order to solve the large sparse systems of linear equations arising from numerical solutions of two-dimensional steady incompressible viscous flow problems in primitive variable formulation, we present block SSOR and modified block SSOR iteration methods based on the special structures of the coefficient matrices. In each step of the block SSOR iteration, we employ the block LU factorization to solve the sub-systems of linear equations. We show that the block LU factorization is existent and stable when the coefficient matrices are block diagonally dominant of type-II by columns. Under suitable conditions, we establish convergence theorems for both block SSOR and modified block SSOR iteration methods. In addition, the block SSOR iteration and AF-ADI method are considered as preconditioners for the nonsymmetric systems of linear equations. Numerical experiments show that both block SSOR and modified block SSOR iterations are feasible iterative solvers and they are also effective for preconditioning Krylov subspace methods such as GMRES and BiCGSTAB when used to solve this class of systems of linear equations. 相似文献
10.
Based on the linear viscoelastic differential constitutive law and cable structural model, the coupled longitudinal-transverse
waves that propagate along a viscoelastic cable with small curvature is investigated. A mathematical model is presented that
describes the three-dimensional nonlinear response of a viscoelastic cable. An asymptotic form of this model is obtained for
the linear response of cables having small equilibrium curvature. The spectral relation governing the propagating waves is
derived using transform methods. The spectral relation is employed in deriving a Green's function that is then used to construct
solutions for in-plane response under distributed harmonic excitation. Analysis of forced response reveals the existence of
two types of periodic waves that propagate through the cable, one characterizing extension-comprehensive deformation and the
other characteristic transverse deformation.
Project supported by the National Natural Science Foundation of China (No. 59635140). 相似文献