全文获取类型
收费全文 | 1523篇 |
免费 | 76篇 |
国内免费 | 72篇 |
专业分类
化学 | 132篇 |
力学 | 33篇 |
综合类 | 3篇 |
数学 | 1382篇 |
物理学 | 121篇 |
出版年
2024年 | 4篇 |
2023年 | 22篇 |
2022年 | 23篇 |
2021年 | 23篇 |
2020年 | 34篇 |
2019年 | 41篇 |
2018年 | 41篇 |
2017年 | 38篇 |
2016年 | 27篇 |
2015年 | 45篇 |
2014年 | 69篇 |
2013年 | 139篇 |
2012年 | 49篇 |
2011年 | 93篇 |
2010年 | 69篇 |
2009年 | 110篇 |
2008年 | 118篇 |
2007年 | 118篇 |
2006年 | 85篇 |
2005年 | 63篇 |
2004年 | 63篇 |
2003年 | 50篇 |
2002年 | 36篇 |
2001年 | 37篇 |
2000年 | 33篇 |
1999年 | 23篇 |
1998年 | 37篇 |
1997年 | 32篇 |
1996年 | 16篇 |
1995年 | 15篇 |
1994年 | 19篇 |
1993年 | 13篇 |
1992年 | 5篇 |
1991年 | 5篇 |
1990年 | 8篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1985年 | 6篇 |
1984年 | 8篇 |
1983年 | 5篇 |
1982年 | 8篇 |
1981年 | 8篇 |
1980年 | 4篇 |
1979年 | 6篇 |
1978年 | 1篇 |
1977年 | 4篇 |
1976年 | 4篇 |
1975年 | 1篇 |
排序方式: 共有1671条查询结果,搜索用时 15 毫秒
71.
In this note, we point out that the conclusion of Theorem 2.1 of Ref. 1 applies to any decomposable linear subspace of L
p
(T, E). 相似文献
72.
马米佳 《新疆大学学报(理工版)》2000,17(1):16-19
利用一类紧abelian群G上的函数空间L2(G)上以及D(R)上平移不变线性泛函的自动连续性并结合闭图象定理证明这些空间上的平移不变线性算子连续。 相似文献
73.
Convergence of the Magnus Series 总被引:1,自引:0,他引:1
The Magnus series is an infinite series which arises in the study of linear ordinary differential equations. If the series converges, then the matrix exponential of the sum equals the fundamental solution of the differential equation. The question considered in this paper is: When does the series converge? The main result establishes a sufficient condition for convergence, which improves on several earlier results. 相似文献
74.
Arcadii Z. Grinshpan 《Journal of Mathematical Analysis and Applications》2008,338(2):1418-1430
We present several integral and exponential inequalities for formal power series and for both arbitrary entire functions of exponential type and generalized Borel transforms. They are obtained through certain limit procedures which involve the multiparameter binomial inequalities, integral inequalities for continuous functions, and weighted norm inequalities for analytic functions. Some applications to the confluent hypergeometric functions, Bessel functions, Laguerre polynomials, and trigonometric functions are discussed. Also some generalizations are given. 相似文献
75.
Yanir A. Rubinstein 《Journal of Functional Analysis》2008,255(9):2641-2660
We prove that the existence of a Kähler-Einstein metric on a Fano manifold is equivalent to the properness of the energy functionals defined by Bando, Chen, Ding, Mabuchi and Tian on the set of Kähler metrics with positive Ricci curvature. We also prove that these energy functionals are bounded from below on this set if and only if one of them is. This answers two questions raised by X.-X. Chen. As an application, we obtain a new proof of the classical Moser-Trudinger-Onofri inequality on the two-sphere, as well as describe a canonical enlargement of the space of Kähler potentials on which this inequality holds on higher-dimensional Fano Kähler-Einstein manifolds. 相似文献
76.
Jiaowan Luo 《Journal of Mathematical Analysis and Applications》2008,342(2):753-760
The fixed-point theory is first used to consider the stability for stochastic partial differential equations with delays. Some conditions for the exponential stability in pth mean as well as in sample path of mild solutions are given. These conditions do not require the monotone decreasing behavior of the delays, which is necessary in [T. Caraballo, K. Liu, Exponential stability of mild solutions of stochastic partial differential equations with delays, Stoch. Anal. Appl. 17 (1999) 743-763; Ruhollan Jahanipur, Stability of stochastic delay evolution equations with monotone nonlinearity, Stoch. Anal. Appl. 21 (2003) 161-181]. Even in this special case, our results also improve the results in [T. Caraballo, K. Liu, Exponential stability of mild solutions of stochastic partial differential equations with delays, Stoch. Anal. Appl. 17 (1999) 743-763]. 相似文献
77.
Using the Riesz basis approach, we study a sandwich beam that is composed of an outer stiff layer and a compliant middle layer.
The dynamic behavior and analyticity of the system are obtained based on a detailed spectral analysis and Riesz basis generation.
As a consequence, the analyticity of the solution and the exponential stability of the system are concluded.
This work was supported by the National Natural Science Foundation of China, Program for New Century Excellent Talents in
the Universities of China and by the National Research Foundation of South Africa. 相似文献
78.
就一类高阶时滞Cohen-Grossberg社昆网络进行研究,假设反应函数满足Lipschitz连续且有界,用非线性测度的方法得到了关于平衡点的存在性和惟一性的一种新的充分性的判别条件,同时,通过构造一个合适的Lyapunov函数,得到这个条件也保证了时滞神经网络的全局指数稳定性. 相似文献
79.
A. L. Kuz’mina 《Russian Mathematics (Iz VUZ)》2008,52(7):8-14
We study Besicovitch-type spaces of generalized almost periodic functions. The main result is a theorem on representation of linear continuous functionals that is similar to the classical result of F. Riesz. 相似文献
80.
Kosuke Homma 《Journal of Number Theory》2008,128(3):500-508
In this paper we consider the distribution of fractional parts {ν/p}, where p is a prime less than or equal to x and ν is the root in Z/pZ of a quadratic polynomial with negative discriminant. This set is known to be uniformly distributed as x→∞. Here we apply the Erd?s-Turán inequality to obtain an estimate for the discrepancy. 相似文献