全文获取类型
收费全文 | 8385篇 |
免费 | 370篇 |
国内免费 | 733篇 |
专业分类
化学 | 767篇 |
晶体学 | 7篇 |
力学 | 390篇 |
综合类 | 65篇 |
数学 | 7083篇 |
物理学 | 1176篇 |
出版年
2023年 | 84篇 |
2022年 | 77篇 |
2021年 | 90篇 |
2020年 | 157篇 |
2019年 | 162篇 |
2018年 | 198篇 |
2017年 | 203篇 |
2016年 | 242篇 |
2015年 | 164篇 |
2014年 | 327篇 |
2013年 | 578篇 |
2012年 | 327篇 |
2011年 | 353篇 |
2010年 | 333篇 |
2009年 | 517篇 |
2008年 | 600篇 |
2007年 | 545篇 |
2006年 | 503篇 |
2005年 | 445篇 |
2004年 | 313篇 |
2003年 | 389篇 |
2002年 | 357篇 |
2001年 | 270篇 |
2000年 | 273篇 |
1999年 | 283篇 |
1998年 | 222篇 |
1997年 | 239篇 |
1996年 | 141篇 |
1995年 | 117篇 |
1994年 | 107篇 |
1993年 | 71篇 |
1992年 | 58篇 |
1991年 | 62篇 |
1990年 | 72篇 |
1989年 | 53篇 |
1988年 | 54篇 |
1987年 | 40篇 |
1986年 | 39篇 |
1985年 | 50篇 |
1984年 | 57篇 |
1983年 | 20篇 |
1982年 | 36篇 |
1981年 | 32篇 |
1980年 | 34篇 |
1979年 | 26篇 |
1978年 | 30篇 |
1977年 | 41篇 |
1976年 | 25篇 |
1974年 | 16篇 |
1973年 | 16篇 |
排序方式: 共有9488条查询结果,搜索用时 0 毫秒
41.
Yan Xu 《Journal of Mathematical Analysis and Applications》2007,329(2):1343-1354
In this paper, we obtain some normality criteria for families of meromorphic functions that concern the exceptional functions of derivatives. 相似文献
42.
Won-Sang Chung 《International Journal of Theoretical Physics》2003,42(12):2941-2946
In this paper we use the bosonic realization of ospq(1/2) algebra to obtain its metaplectic representation. The group element for this algebra is shown to be described in terms of the basic hypergeometric function. 相似文献
43.
The excess molar enthalpy of ternary mixture for 3-diethylaminopropylamine+heptane+cyclohexane were measured using a Calvet
microcalorimeter at 303.15 K.
Empirical equations, Redlich-Kister, Tsao-Smith, and Kohler and group contribution models, UNIFAC (modified version) and DISQUAC
have been applied. A reasonable representation of ternary data is obtained.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
44.
A uniqueness theorem for two distinct non-constant meromorphic functions that share three values of finite weights is proved, which generalizes two previous results by H.X. Yi, and X.M. Li and H.X. Yi. As applications of it, many known results by H.X. Yi and P. Li, etc. could be improved. Furthermore, with the concept of finite-weight sharing, extensions on Osgood-Yang's conjecture and Mues' conjecture, and a generalization of some prevenient results by M. Ozawa and H. Ueda, ect. could be obtained. 相似文献
45.
Takashi Nakamura 《Journal of Number Theory》2007,123(1):1-9
In this paper, we define λ-joint, a′-joint, (λ,λ)-joint, (λ,a′)-joint and (a′,a′)-joint t-universality of Lerch zeta functions and consider the relations among those. Next we show the existence of (λ,λ)-joint t-universality. Finally, we also show the existence of λ-joint, a′-joint, (λ,a′)-joint and (a′,a′)-joint t-universality by using inversion formulas. 相似文献
46.
Salvador Hernández 《Topology and its Applications》2007,154(10):2089-2098
Let C(X,G) be the group of continuous functions from a topological space X into a topological group G with pointwise multiplication as the composition law, endowed with the uniform convergence topology. To what extent does the group structure of C(X,G) determine the topology of X? More generally, when does the existence of a group homomorphism H between the groups C(X,G) and C(Y,G) implies that there is a continuous map h of Y into X such that H is canonically represented by h? We prove that, for any topological group G and compact spaces X and Y, every non-vanishing C-isomorphism (defined below) H of C(X,G) into C(Y,G) is automatically continuous and can be canonically represented by a continuous map h of Y into X. Some applications to specific groups and examples are given in the paper. 相似文献
47.
I. P. Rochev 《Mathematical Notes》2007,81(1-2):247-259
We consider generalizations of Pólya’s theorem to the case of entire functions taking algebraic values at natural or integer points. 相似文献
48.
小球与均质自由杆的碰撞 总被引:2,自引:2,他引:0
讨论了小球与自由杆碰撞过程中所遵从的物理规律,明确了完全非弹性碰撞过程的能量特征,指出完全非弹性碰撞后两物体不一定粘在一起共同运动的事实. 相似文献
49.
Nash Equilibria,Variational Inequalities,and Dynamical Systems 总被引:2,自引:0,他引:2
Cavazzuti E. Pappalardo M. Passacantando M. 《Journal of Optimization Theory and Applications》2002,114(3):491-506
In this paper, we introduce some relationships between Nash equilibria, variational equilibria, and dynamical equilibria for noncooperative games. 相似文献
50.
Morgan A. Hanson 《Journal of Global Optimization》1991,1(3):287-293
The van der Waerden permanent problem was solved using mainly algebraic methods. A much simpler analytic proof is given using a new concept in optimization theory which may be of importance in the general theory of mathematical programming. 相似文献