全文获取类型
收费全文 | 404篇 |
免费 | 78篇 |
国内免费 | 33篇 |
专业分类
化学 | 126篇 |
晶体学 | 4篇 |
力学 | 58篇 |
综合类 | 7篇 |
数学 | 253篇 |
物理学 | 67篇 |
出版年
2024年 | 2篇 |
2023年 | 5篇 |
2022年 | 3篇 |
2021年 | 6篇 |
2020年 | 13篇 |
2019年 | 23篇 |
2018年 | 16篇 |
2017年 | 20篇 |
2016年 | 28篇 |
2015年 | 26篇 |
2014年 | 20篇 |
2013年 | 31篇 |
2012年 | 17篇 |
2011年 | 23篇 |
2010年 | 12篇 |
2009年 | 20篇 |
2008年 | 17篇 |
2007年 | 22篇 |
2006年 | 23篇 |
2005年 | 15篇 |
2004年 | 23篇 |
2003年 | 22篇 |
2002年 | 14篇 |
2001年 | 17篇 |
2000年 | 22篇 |
1999年 | 15篇 |
1998年 | 16篇 |
1997年 | 9篇 |
1996年 | 10篇 |
1995年 | 2篇 |
1994年 | 7篇 |
1993年 | 1篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 4篇 |
1987年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有515条查询结果,搜索用时 46 毫秒
61.
62.
Chuanyi Zhang 《Czechoslovak Mathematical Journal》1997,47(3):385-394
Vector-valued pseudo almost periodic functions are defined and their properties are investigated. The vector-valued functions contain many known functions as special cases. A unique decomposition theorem is given to show that a vector-valued pseudo almost periodic function is a sum of an almost periodic function and an ergodic perturbation. 相似文献
63.
V K B Kota 《Pramana》1977,9(2):129-140
The single particle SU(3) parentage coefficients are calculated for the case of leading SU(3) representation in the highest
orbital symmetry partition, using the method suggested by Hecht. Tabulations are given for all possible cases of identical
nucleons in η=3 and η=4 shells. 相似文献
64.
65.
66.
Blocking is often used to reduce known variability in designed experiments by collecting together homogeneous experimental units. A common modeling assumption for such experiments is that responses from units within a block are dependent. Accounting for such dependencies in both the design of the experiment and the modeling of the resulting data when the response is not normally distributed can be challenging, particularly in terms of the computation required to find an optimal design. The application of copulas and marginal modeling provides a computationally efficient approach for estimating population‐average treatment effects. Motivated by an experiment from materials testing, we develop and demonstrate designs with blocks of size two using copula models. Such designs are also important in applications ranging from microarray experiments to experiments on human eyes or limbs with naturally occurring blocks of size two. We present a methodology for design selection, make comparisons to existing approaches in the literature, and assess the robustness of the designs to modeling assumptions. 相似文献
67.
In this study, we focus on the solutions of the Li\''enard equation being bounded in the future and characterize the almost automorphic, asymptotically almost automorphic, and weighted pseudo almost automorphic dynamics. An example is presented to illustrate the main findings. 相似文献
68.
Existence of $\mu$-pseudo almost automorphic solutions to abstract partial neutral functional differential equations with infinite delay 下载免费PDF全文
Yong-Kui Chang G. M. N''Gu ''{e}r ''{e}kat Rui Zhang 《Journal of Applied Analysis & Computation》2016,6(3):628-664
In this article, we introduce and investigate the concept of $\mu$-Stepanov-like pseudo almost automorphic functions of class $h$ and class infinity via measure theory. We present new results on completeness and composition theorems for the space of such functions. To illustrate our main results, we provide some applications to an abstract partial neutral functional differential equation with infinite delay. 相似文献
69.
In this paper, applying the theory of semigroups of operators to evolution family and Banach fixed point theorem, we prove the existence and uniqueness of an (a) almost automorphic (weighted pseudo almost automorphic) mild solution of the semilinear evolution equation x′(t)=A(t)x(t)+f(t,x(t)) in Banach space under conditions. 相似文献
70.
In this paper, we give a definition of pseudo almost periodic sequence and study the existence of pseudo almost periodic sequence to difference equation. Based on these, we investigate the existence of pseudo almost periodic solutions to differential equations with piecewise constant arguments which was considered by K. L. Cooke & J. Wiener and found applications in certain biomedical problems. 相似文献