全文获取类型
收费全文 | 4605篇 |
免费 | 175篇 |
国内免费 | 32篇 |
专业分类
化学 | 3232篇 |
晶体学 | 37篇 |
力学 | 76篇 |
数学 | 622篇 |
物理学 | 845篇 |
出版年
2023年 | 25篇 |
2022年 | 65篇 |
2021年 | 107篇 |
2020年 | 107篇 |
2019年 | 98篇 |
2018年 | 94篇 |
2017年 | 60篇 |
2016年 | 159篇 |
2015年 | 129篇 |
2014年 | 152篇 |
2013年 | 250篇 |
2012年 | 316篇 |
2011年 | 398篇 |
2010年 | 190篇 |
2009年 | 163篇 |
2008年 | 279篇 |
2007年 | 261篇 |
2006年 | 262篇 |
2005年 | 227篇 |
2004年 | 180篇 |
2003年 | 162篇 |
2002年 | 143篇 |
2001年 | 56篇 |
2000年 | 67篇 |
1999年 | 41篇 |
1998年 | 30篇 |
1997年 | 41篇 |
1996年 | 66篇 |
1995年 | 52篇 |
1994年 | 25篇 |
1993年 | 36篇 |
1992年 | 37篇 |
1991年 | 33篇 |
1990年 | 24篇 |
1989年 | 21篇 |
1988年 | 26篇 |
1987年 | 16篇 |
1986年 | 20篇 |
1985年 | 31篇 |
1984年 | 23篇 |
1983年 | 21篇 |
1982年 | 34篇 |
1981年 | 29篇 |
1980年 | 29篇 |
1979年 | 24篇 |
1978年 | 26篇 |
1977年 | 14篇 |
1975年 | 17篇 |
1974年 | 13篇 |
1973年 | 17篇 |
排序方式: 共有4812条查询结果,搜索用时 31 毫秒
191.
Adam W. Strzebongraveski 《代数通讯》2013,41(1):41-50
In this paper we eliminate the complex analytic part from original Lojasiewicz's proof and show a constructive method of producing a saucissonnage for a set of polynomials. 相似文献
192.
193.
The paper is concerned with the extension of the classical study of probability measures on a compact group which are square roots of the Haar measure, due to Diaconis and Shahshahani, to the context of compact quantum groups. We provide a simple characterisation for compact quantum groups which admit no non-trivial square roots of the Haar state in terms of their corepresentation theory. In particular it is shown that such compact quantum groups are necessarily of Kac type and their subalgebras generated by the coefficients of a fixed two-dimensional irreducible corepresentation are isomorphic (as finite quantum groups) to the algebra of functions on the group of unit quaternions. An example of a quantum group whose Haar state admits no nontrivial square root and which is neither commutative nor cocommutative is given. 相似文献
194.
195.
196.
197.
Jakob Woisetschl?ger Adam D. Wexler Gert Holler Mathias Eisenhut Karl Gatterer Elmar C. Fuchs 《Experiments in fluids》2012,52(1):193-205
When a high-voltage direct-current is applied to two beakers filled with polar liquid dielectrica like water or methanol,
a horizontal bridge forms between the two beakers. By repeating a version of Pellat’s experiment, it is shown that a horizontal
bridge is stable by the action of electrohydrodynamic pressure. Thus, the static and dynamic properties of the phenomenon
called a ‘floating water bridge’ can be explained by the gradient of Maxwell pressure, replenishing the liquid within the
bridge against any drainage mechanism. It is also shown that a number of liquids can form stable and long horizontal bridges.
The stability of such a connection, and the asymmetry in mass flow through such bridges caused by the formation of ion clouds
in the vicinity of the electrodes, is also discussed by two further experiments. 相似文献
198.
199.
200.
Maëva-Charlotte Kervarec Prof. Dr. Erhard Kemnitz Priv.-Doz. Dr. Gudrun Scholz Dr. Svemir Rudić Prof. Dr. Thomas Braun Prof. Dr. Christian Jäger Dr. Adam A. L. Michalchuk Priv.-Doz. Dr. Franziska Emmerling 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(32):7314-7322
The very strong Lewis acid aluminium chlorofluoride (ACF) was loaded with anhydrous HF. The interaction between the surface of the catalyst and HF was investigated using a variety of characterization methods, which revealed the formation of polyfluorides. Moreover, the reactivity of the HF-loaded ACF towards the hydrofluorination of alkynes was studied. 相似文献