全文获取类型
收费全文 | 1630篇 |
免费 | 57篇 |
国内免费 | 13篇 |
专业分类
化学 | 1172篇 |
晶体学 | 10篇 |
力学 | 43篇 |
数学 | 213篇 |
物理学 | 262篇 |
出版年
2023年 | 6篇 |
2022年 | 15篇 |
2021年 | 15篇 |
2020年 | 21篇 |
2019年 | 17篇 |
2018年 | 24篇 |
2017年 | 11篇 |
2016年 | 65篇 |
2015年 | 50篇 |
2014年 | 76篇 |
2013年 | 87篇 |
2012年 | 94篇 |
2011年 | 183篇 |
2010年 | 91篇 |
2009年 | 71篇 |
2008年 | 103篇 |
2007年 | 100篇 |
2006年 | 91篇 |
2005年 | 101篇 |
2004年 | 78篇 |
2003年 | 78篇 |
2002年 | 26篇 |
2001年 | 25篇 |
2000年 | 18篇 |
1999年 | 31篇 |
1998年 | 13篇 |
1997年 | 12篇 |
1996年 | 20篇 |
1995年 | 9篇 |
1994年 | 14篇 |
1993年 | 11篇 |
1992年 | 9篇 |
1991年 | 11篇 |
1990年 | 5篇 |
1988年 | 5篇 |
1986年 | 5篇 |
1985年 | 6篇 |
1984年 | 7篇 |
1983年 | 6篇 |
1982年 | 7篇 |
1981年 | 6篇 |
1980年 | 5篇 |
1979年 | 9篇 |
1978年 | 5篇 |
1977年 | 9篇 |
1976年 | 5篇 |
1975年 | 4篇 |
1974年 | 8篇 |
1973年 | 7篇 |
1966年 | 3篇 |
排序方式: 共有1700条查询结果,搜索用时 15 毫秒
1.
The extended Airy kernel describes the space-time correlation functions for the Airy process, which is the limiting process for a polynuclear growth model. The Airy functions themselves are given by integrals in which
the exponents have a cubic singularity, arising from the coalescence of two saddle points in an asymptotic analysis. Pearcey
functions are given by integrals in which the exponents have a quartic singularity, arising from the coalescence of three
saddle points. A corresponding Pearcey kernel appears in a random matrix model and a Brownian motion model for a fixed time. This paper derives an extended Pearcey kernel by scaling the Brownian motion model at several times, and a system of partial differential equations whose solution determines
associated distribution functions. We expect there to be a limiting nonstationary process consisting of infinitely many paths,
which we call the Pearcey process, whose space-time correlation functions are expressible in terms of this extended kernel. 相似文献
2.
Addition of aqueous hydrogen peroxide significantly accelerates the substitution reactions of hydroxide salts with haloarenes bearing electron withdrawing substituents. A similar effect is observed in the reactions of hydroxide salts with halogenated heteroarenes. Reactions are carried out in water or water-THF at ambient temperature or at 50-60 °C. 相似文献
3.
4.
5.
6.
7.
Ching Sum Hui Lillian Sze Man Lam Chun Yin Wai Kin Chan Aleksandra B. Djurii 《Journal of polymer science. Part A, Polymer chemistry》2003,41(11):1708-1715
Polyurethanes incorporated with rhenium diimine complexes were synthesized. The polymers exhibited interesting morphologies and solution properties. Results from gel permeation chromatography suggested the formation of polymer aggregates in solutions. The polymers could act as probes for metal ions. The addition of metal ions to polymer solutions led to significant changes in the electronic absorption properties of the polymer solutions. This was attributed to the interactions between the polyether moieties and metal ions. The metal complexes could also act as efficient photosensitizers. After doping with charge‐transport viologens, the photoconductivity of the polymers was greatly enhanced. The experimental quantum efficiency was simulated with Onsager's theory. The thermalization distances and the primary yields were typically 12–14 Å and 10?3, respectively. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 1708–1715, 2003 相似文献
8.
9.
Recent developments in the aerobic oxidation of alcohols 总被引:1,自引:0,他引:1
10.
We shall answer several questions concerning additive or multiplicative commutators in a division ring which are algebraic of bounded degree over its center. 相似文献