全文获取类型
收费全文 | 1702篇 |
免费 | 106篇 |
国内免费 | 4篇 |
专业分类
化学 | 1093篇 |
晶体学 | 11篇 |
力学 | 70篇 |
数学 | 242篇 |
物理学 | 396篇 |
出版年
2024年 | 2篇 |
2023年 | 11篇 |
2022年 | 31篇 |
2021年 | 43篇 |
2020年 | 57篇 |
2019年 | 33篇 |
2018年 | 36篇 |
2017年 | 40篇 |
2016年 | 76篇 |
2015年 | 84篇 |
2014年 | 83篇 |
2013年 | 101篇 |
2012年 | 158篇 |
2011年 | 191篇 |
2010年 | 109篇 |
2009年 | 63篇 |
2008年 | 146篇 |
2007年 | 120篇 |
2006年 | 106篇 |
2005年 | 78篇 |
2004年 | 55篇 |
2003年 | 36篇 |
2002年 | 24篇 |
2001年 | 10篇 |
2000年 | 12篇 |
1999年 | 11篇 |
1998年 | 13篇 |
1997年 | 5篇 |
1996年 | 12篇 |
1995年 | 4篇 |
1994年 | 7篇 |
1993年 | 7篇 |
1992年 | 7篇 |
1991年 | 5篇 |
1990年 | 3篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1986年 | 2篇 |
1985年 | 5篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1975年 | 1篇 |
1974年 | 2篇 |
1973年 | 1篇 |
1964年 | 1篇 |
排序方式: 共有1812条查询结果,搜索用时 78 毫秒
51.
52.
53.
54.
Rupert L. Frank Elliott H. Lieb Julien Sabin 《Geometric And Functional Analysis》2016,26(4):1095-1134
We give a necessary and sufficient condition for the precompactness of all optimizing sequences for the Stein–Tomas inequality. In particular, if a well-known conjecture about the optimal constant in the Strichartz inequality is true, we obtain the existence of an optimizer in the Stein–Tomas inequality. Our result is valid in any dimension. 相似文献
55.
Triangle centers such as the center of gravity, the circumcenter, the orthocenter are well studied by geometers. Recently, under the guidance of Clark Kimberling, an electronic encyclopedia of triangle centers (ETC) has been developed, it contains more than 7000 centers and many properties of these points. In this paper, we describe how we created a certified version of ETC such that some of the properties described come along with a computer checked proof of its validity. 相似文献
56.
Detrimental Ni(0) transfer in Kumada catalyst transfer polycondensation of benzo[2,1‐b:3,4‐b']dithiophene
下载免费PDF全文
![点击此处可从《Journal of polymer science. Part A, Polymer chemistry》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Anjan Bedi Julien De Winter Pascal Gerbaux Guy Koeckelberghs 《Journal of polymer science. Part A, Polymer chemistry》2016,54(12):1706-1712
This article deals with the Kumada Catalyst Transfer Polycondensation (KCTP) of 4,7‐dioctylbenzo[2,1‐b:3,4‐b']dithiophene ( BDP‐Oct ) using Ni(II) catalyst or In/cat combination. A combination of MALDI MS, GPC, and 31P NMR spectroscopy is used to reveal the failure of the KCTP of this particular monomer. Intermolecular transfer reactions to monomer appeared to prevent the formation of polymer. This result is remarkable, since isomeric benzo[1,2‐b:4,5‐b']dithiophene polymerizes in a controlled way. The presence of a “non‐aromatic double bond” in annulated monomers is discussed. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016 , 54, 1706–1712 相似文献
57.
Corrigendum: An NMR‐Driven Crystallography Strategy to Overcome the Computability Limit of Powder Structure Determination: A Layered Aluminophosphate Case
下载免费PDF全文
![点击此处可从《Chemistry (Weinheim an der Bergstrasse, Germany)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
58.
We study the properties of the ergosurface of the Pomeransky–Senkov black rings, and show that it splits into an “inner” and
an “outer” region. As for the singular set, the topology of the “outer ergosurface” depends upon the value of parameters. 相似文献
59.
Momodu Damilola Madito Moshawe Barzegar Farshad Bello Abdulhakeem Khaleed Abubakar Olaniyan Okikiola Dangbegnon Julien Manyala Ncholu 《Journal of Solid State Electrochemistry》2017,21(3):859-872
Journal of Solid State Electrochemistry - Activated carbon from tree bark (ACB) has been synthesized by a facile and environmentally friendly activation and carbonization process at different... 相似文献
60.
A. Jibawy C. Julien B. Desmorat A. Vincenti F. Léné 《International Journal of Solids and Structures》2011,48(18):2576-2584
A novel methodology for the design of optimal uncoupled laminated plates under membrane only or bending only loading is introduced. This approach is supported by the polar representation of anisotropy. First, topology optimization, aimed at maximizing global stiffness of the structure, allows to find an optimal distribution of polar components. Then, based on the latter structural results, a matching feasible lamination sequence is determined. 相似文献