全文获取类型
收费全文 | 2106篇 |
免费 | 59篇 |
国内免费 | 59篇 |
专业分类
化学 | 9篇 |
力学 | 212篇 |
综合类 | 2篇 |
数学 | 1894篇 |
物理学 | 107篇 |
出版年
2023年 | 28篇 |
2022年 | 27篇 |
2021年 | 26篇 |
2020年 | 34篇 |
2019年 | 55篇 |
2018年 | 48篇 |
2017年 | 43篇 |
2016年 | 36篇 |
2015年 | 34篇 |
2014年 | 114篇 |
2013年 | 211篇 |
2012年 | 55篇 |
2011年 | 129篇 |
2010年 | 121篇 |
2009年 | 147篇 |
2008年 | 180篇 |
2007年 | 143篇 |
2006年 | 113篇 |
2005年 | 86篇 |
2004年 | 90篇 |
2003年 | 81篇 |
2002年 | 57篇 |
2001年 | 49篇 |
2000年 | 33篇 |
1999年 | 31篇 |
1998年 | 44篇 |
1997年 | 36篇 |
1996年 | 28篇 |
1995年 | 18篇 |
1994年 | 27篇 |
1993年 | 16篇 |
1992年 | 11篇 |
1991年 | 6篇 |
1990年 | 10篇 |
1989年 | 3篇 |
1988年 | 7篇 |
1987年 | 4篇 |
1986年 | 1篇 |
1985年 | 4篇 |
1984年 | 3篇 |
1983年 | 4篇 |
1982年 | 5篇 |
1981年 | 2篇 |
1979年 | 7篇 |
1978年 | 4篇 |
1977年 | 2篇 |
1976年 | 4篇 |
1975年 | 3篇 |
1974年 | 2篇 |
1973年 | 1篇 |
排序方式: 共有2224条查询结果,搜索用时 31 毫秒
91.
W.A. Kirk 《Journal of Mathematical Analysis and Applications》2003,277(2):645-650
Let be a contractive gauge function in the sense that φ is continuous, φ(s)<s for s>0, and if f:M→M satisfies d(f(x),f(y))?φ(d(x,y)) for all x,y in a complete metric space (M,d), then f always has a unique fixed point. It is proved that if T:M→M satisfies
92.
Tomomitsu Teramoto 《Journal of Mathematical Analysis and Applications》2003,282(2):531-552
We study positive radial entire solutions of second-order quasilinear elliptic systems of the form
(∗) 相似文献
93.
Yang Haitao 《Journal of Differential Equations》2003,189(2):487-512
The following singular elliptic boundary value problem is studied:
94.
95.
H. Herwig 《International Journal of Computational Fluid Dynamics》2013,27(5):423-431
Dissipation effects that are neglected in almost all numerical codes when it comes to turbulent flows are analysed systematically. It is shown how the direct and the indirect dissipation can be implemented into the codes when asymptotic considerations about the flow behaviour close to a wall are taken into account. As an example, adiabatic pipe flow is analysed with special emphasis on the distribution of energy between the mechanical and thermal part of the total energy. 相似文献
96.
Maria Elena Valcher 《Linear algebra and its applications》2010,432(4):980-1006
The aim of this paper is that of investigating the asymptotic exponential cone of a single Metzler matrix, introduced in [23], and of defining and analysing the new concept of asymptotic exponential cone of a family of Metzler matrices (along a certain direction). These results will provide necessary and/or sufficient conditions for the solvability of an interesting algebraic problem that arises in the context of continuous-time positive switched systems and, specifically, in the investigation of the reachability property [21,22,25]. 相似文献
97.
In this work, the asymptotic behavior of all solutions of second-order nonlinear ordinary differential equations with impulses is investigated. By impulsive differential inequality and Riccati transformation, sufficient conditions of asymptotic behavior of all solutions of second-order nonlinear ordinary differential equations with impulses are obtained. An example is also inserted to illustrate the impulsive effect. 相似文献
98.
Alan L.T. Paterson 《Journal of Functional Analysis》2008,255(6):1458-1479
The paper establishes, for a wide class of locally compact groupoids Γ, the E-theoretic descent functor at the C∗-algebra level, in a way parallel to that established for locally compact groups by Guentner, Higson and Trout. Section 2 shows that Γ-actions on a C0(X)-algebra B, where X is the unit space of Γ, can be usefully formulated in terms of an action on the associated bundle B?. Section 3 shows that the functor B→C∗(Γ,B) is continuous and exact, and uses the disintegration theory of J. Renault. Section 4 establishes the existence of the descent functor under a very mild condition on Γ, the main technical difficulty involved being that of finding a Γ-algebra that plays the role of Cbcont(T,B) in the group case. 相似文献
99.
Giovanna Bonfanti Maria Grazia Naso 《Journal of Mathematical Analysis and Applications》2008,345(1):186-202
In this paper we analyze a dynamic unilateral contact problem between two thermoelastic beams. We establish the existence of a weak global-in-time solution, by a penalization method. Moreover, we study the asymptotic behavior of such a solution proving that the energy associated to the system decays exponentially to zero, as time goes to infinity. 相似文献
100.
唐荣荣 《数学物理学报(A辑)》2008,28(6):1128-1132
利用渐近理论和微分不等式的方法,该文研究了一类非线性奇摄动Robin问题. 证明了其解的存在性,并得到了解的任意n 阶一致有效渐近展开式. 相似文献