全文获取类型
收费全文 | 335篇 |
免费 | 36篇 |
国内免费 | 22篇 |
学科分类
数理化 | 393篇 |
出版年
2024年 | 3篇 |
2023年 | 11篇 |
2022年 | 6篇 |
2021年 | 13篇 |
2020年 | 27篇 |
2019年 | 12篇 |
2018年 | 22篇 |
2017年 | 23篇 |
2016年 | 15篇 |
2015年 | 14篇 |
2014年 | 18篇 |
2013年 | 57篇 |
2012年 | 16篇 |
2011年 | 24篇 |
2010年 | 16篇 |
2009年 | 14篇 |
2008年 | 15篇 |
2007年 | 15篇 |
2006年 | 9篇 |
2005年 | 17篇 |
2004年 | 7篇 |
2003年 | 3篇 |
2002年 | 6篇 |
2001年 | 6篇 |
2000年 | 2篇 |
1999年 | 5篇 |
1998年 | 3篇 |
1997年 | 6篇 |
1996年 | 4篇 |
1995年 | 1篇 |
1993年 | 1篇 |
1987年 | 1篇 |
1985年 | 1篇 |
排序方式: 共有393条查询结果,搜索用时 125 毫秒
1.
This paper undertakes a systematic treatment of the low regularity local wellposedness and ill-posedness theory in Hs andHs for semilinear wave equations with polynomial nonlinearity in u and (e)u. This ill-posed result concerns the focusing type equations with nonlinearity on u and (e)tu. 相似文献
2.
Recently, molecular imaging has been rapidly developed to studyphysiological and pathological processes in vivo at the cellularand molecular levels. Among molecular imaging modalities, opticalimaging has attracted a major attention for its unique advantages.In this paper, we establish a mathematical framework for multispectralbioluminescence tomography (BLT) that allows simultaneous studiesof multiple optical reporters. We show solution existence, uniquenessand continuous dependence on data as well as the limiting behaviourswhen the regularization parameter approaches zero or when thepenalty parameter approaches infinity. Then, we propose twonumerical schemes for multispectral BLT and derive error estimatesfor the corresponding solutions. 相似文献
3.
Instability of Solitary Waves in Nonlinear Composite Media 总被引:1,自引:0,他引:1
Ye Zhao 《应用数学学报(英文版)》2007,23(2):311-318
In this paper,we investigate a class of Hamiltonian systems arising in nonlinear composite media.By detailed analysis and computation we obtain a decaying estimates on the semigroup and prove the orbitalinstability of two families of explicit solitary wave solutions (slow family in anisotropic case and solitary wavesin isotropic case),which theoretically verify the related guess and numerical results. 相似文献
4.
We study elliptic systems of strongly nonlinear first-order differential equations in complex form on the plane. For such systems we develop the theory of Hilbert boundary value problems which is very much similar to the well-known theory for a holomorphic vector. Systems of nonlinear elliptic equations describe problems of interaction of several nonlinear stationary processes in the diffusive and convective mass and heat transport by hydrodynamic fluid flows. 相似文献
5.
杜毅 《新疆大学学报(理工版)》2004,21(3):258-266
本文将讨论非终生免疫性传染病模型解的适定性及正则性;同时证明了整体解的存在,以及解对初值的连续依赖。 相似文献
6.
In the present paper,we investigate the well-posedness of the global solution for the Cauchy problem of generalized long-short wave equations.Applying Kato's method for abstract quasi-linear evolution equations and a priori estimates of solution,we get the existence of globally smooth solution. 相似文献
7.
《Optimization》2012,61(2)
We consider robustness properties of second-order methods for the sliding mode control of nonlinear ordinary differential equations. A new approach is presented based on the theory of well-posed optimization problems. It is shown that the convergence of the real states of the control system to the ideal one is intimately related to Tykhonov well-posedness of suitably defined dynamic optimization problems. 相似文献
8.
In this paper we survey some results on existence, and when possible also uniqueness, of solutions to certain evolution equations obtained by injecting randomness either on the set of initial data or as a perturbative term. 相似文献
9.
10.