全文获取类型
收费全文 | 1943篇 |
免费 | 230篇 |
国内免费 | 336篇 |
专业分类
化学 | 1055篇 |
晶体学 | 8篇 |
力学 | 26篇 |
综合类 | 20篇 |
数学 | 669篇 |
物理学 | 731篇 |
出版年
2023年 | 56篇 |
2022年 | 67篇 |
2021年 | 73篇 |
2020年 | 94篇 |
2019年 | 72篇 |
2018年 | 50篇 |
2017年 | 40篇 |
2016年 | 39篇 |
2015年 | 73篇 |
2014年 | 152篇 |
2013年 | 170篇 |
2012年 | 208篇 |
2011年 | 179篇 |
2010年 | 152篇 |
2009年 | 181篇 |
2008年 | 216篇 |
2007年 | 180篇 |
2006年 | 170篇 |
2005年 | 104篇 |
2004年 | 40篇 |
2003年 | 49篇 |
2002年 | 32篇 |
2001年 | 39篇 |
2000年 | 22篇 |
1999年 | 35篇 |
1998年 | 8篇 |
1997年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1986年 | 1篇 |
1985年 | 3篇 |
排序方式: 共有2509条查询结果,搜索用时 31 毫秒
1.
2.
Journal of Algebraic Combinatorics - Highly nonlinear functions (bent functions, perfect nonlinear functions, etc.) on finite fields and finite (abelian or nonabelian) groups have been studied in... 相似文献
3.
Acta Mathematicae Applicatae Sinica, English Series - In this paper, we investigate a delayed HIV infection model that considers the homeostatic proliferation of CD4+ T cells. The existence and... 相似文献
4.
Yu Zhang Lei Jiao Weiqing Xu Yifeng Chen Yu Wu Hongye Yan Wenling Gu Chengzhou Zhu 《中国化学快报》2022,33(3):1317-1320
Although carbon nanozymes have attracted great interest due to their good biocompatibility, low cost,and high stability, designing high-active carbon nanozymes still faces great challenges. Herein, ultrathin nitrogen-doped carbon nanosheets with rich defects(d-NC) were prepared through a high-temperature annealing process, using potassium chloride and ammonium chloride as templates. Owing to the large specific surface area, rich defects and the high exposure of active sites, the proposed d-NC na... 相似文献
5.
Czechoslovak Mathematical Journal - Let G = (VG,EG) be a graph and let NG[υ] denote the closed neighbourhood of a vertex υ in G. A function f: VG ? {?1,0,1} is said to be a... 相似文献
6.
7.
Nonlinear Dynamics - The hybrid neural model provides a computationally effective and biophysics-based neuron behavior model, which maintains its simplicity by incorporating the dynamics... 相似文献
8.
9.
We study ground states of two-component Bose–Einstein condensates (BEC) with trapping potentials in , where the intraspecies interaction and the interspecies interaction ?β are both attractive, , , and β are all positive. The existence and non-existence of ground states are classified completely by investigating equivalently the associated -critical constraint variational problem. The uniqueness and symmetry-breaking of ground states are also analyzed under different types of trapping potentials as , where () is fixed and w is the unique positive solution of in . The semi-trivial limit behavior of ground states is tackled in the companion paper [12]. 相似文献
10.
Science China Mathematics - We consider the following fractional Schrödinger equation: (0.1) $${\left( { - \Delta } \right)^s}u + V\left( y \right)u = {u^p},\,\,\,\,\,\,u >... 相似文献