全文获取类型
收费全文 | 360篇 |
免费 | 9篇 |
国内免费 | 8篇 |
专业分类
化学 | 245篇 |
晶体学 | 1篇 |
力学 | 22篇 |
数学 | 41篇 |
物理学 | 68篇 |
出版年
2022年 | 7篇 |
2021年 | 12篇 |
2020年 | 15篇 |
2019年 | 12篇 |
2018年 | 16篇 |
2017年 | 17篇 |
2016年 | 20篇 |
2015年 | 11篇 |
2014年 | 25篇 |
2013年 | 79篇 |
2012年 | 22篇 |
2011年 | 21篇 |
2010年 | 18篇 |
2009年 | 12篇 |
2008年 | 25篇 |
2007年 | 10篇 |
2006年 | 5篇 |
2005年 | 10篇 |
2004年 | 5篇 |
2003年 | 10篇 |
2002年 | 7篇 |
2001年 | 3篇 |
2000年 | 3篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1992年 | 2篇 |
1989年 | 1篇 |
1986年 | 2篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有377条查询结果,搜索用时 15 毫秒
371.
F. Shirini M. Mashhadi-Nejad 《Phosphorus, sulfur, and silicon and the related elements》2013,188(3):376-381
Abstract Cu(NO3)2 · 3 H2O can be used as an efficient reagent for the chemoselective trimethylsilylation of primary benzylic and aliphatic alcohols with hexamethyldisilazane (HMDS). This reagent is also able to oxidize the obtained trimethylsilyl ethers to the corresponding carbonyl compounds in the presence of wet SiO2 and KBr. In this study, all reactions are performed in the absence of a solvent and good-to-high yields are obtained. 相似文献
372.
V(HSO_4)_3 has been found to be an efficient reagent for the promotion of the oxidation of alcohols and trimethylsilyl, tetrahydropyranyl and methoxymethyl ethers to their corresponding carbonyl compounds with Cu(NO_3)_2·3H_2O in the absence of solvent. 相似文献
373.
Farhad Khoeini A. A. Shokri Farzad Khoeini 《The European Physical Journal B - Condensed Matter and Complex Systems》2010,75(4):505-509
In this work, we study quantum transport properties of
superlattice-graphene nanoribbons (SGNRs) attached to two
semi-infinite metallic armchair graphene nanoribbon (AGNR) leads.
The calculations are based on the tight-binding model and Green’s
function method, in which localization length, density of states
(DOS) and conductance of the system are calculated, numerically.
By controlling the layered boron concentration, this kind of
system can separate the extended states from the localized states.
Our results may have important applications for building blocks in
the nano-electronic devices based on GNRs. 相似文献
374.
375.
376.
377.
Mathematical optimisation of technological forming processes requires expensive simulations to evaluate objective function and constraint values as well as their derivative and Hessian informations. Therefore numerical linearisation methods like the finite difference method or the BFGS-update are necessary. In this work the effects of these approximation techniques are studied. (© 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献