全文获取类型
收费全文 | 59篇 |
免费 | 0篇 |
国内免费 | 2篇 |
专业分类
化学 | 29篇 |
晶体学 | 1篇 |
力学 | 10篇 |
数学 | 15篇 |
物理学 | 6篇 |
出版年
2021年 | 1篇 |
2019年 | 2篇 |
2018年 | 1篇 |
2016年 | 1篇 |
2015年 | 1篇 |
2014年 | 3篇 |
2013年 | 4篇 |
2012年 | 3篇 |
2011年 | 3篇 |
2010年 | 3篇 |
2009年 | 5篇 |
2008年 | 5篇 |
2007年 | 3篇 |
2006年 | 6篇 |
2005年 | 3篇 |
2004年 | 2篇 |
2002年 | 2篇 |
2000年 | 2篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1992年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有61条查询结果,搜索用时 15 毫秒
1.
Alvisi D Blart E Bonini BF Mazzanti G Ricci A Zani P 《The Journal of organic chemistry》1996,61(20):7139-7146
The palladium-catalyzed desilylation-arylation of substituted vinylsilanes by p-iodoanisole in the presence of bidentate phosphine ligands is described. Apart from enhancing the rate of the reaction considerably, heteroatom-based functional groups in the vinylsilane moiety have a profound influence on the regiochemistry. A catalytic cycle for the chelation-controlled desilylation-arylation reaction involving five- and six-membered chelate rings is proposed. 相似文献
2.
A Partial Statistically Incorporation of Ca2+ into the Ba6Nd2Al4O15-Type: Ba5CaLa2Fe4O15 Using high temperature reactions we succeeded in incorporating Ca2+ into the Ba6Nd2Al4O15 type. Single crystal X-ray methods reveal a partly ordered alkaline earth distribution. Ba2+ and Ca2+ occupy face connected MO6-octahedra as well as a further point position together with La3+ ions (space group C−P63mc; a = 11.770; c = 7.039 Å; Z = 2). 相似文献
3.
Juan Bisceglia María B. García Rosana Massa María L. Magri Mariana Zani Gabriel O. Gutkind Liliana R. Orelli 《Journal of heterocyclic chemistry》2004,41(1):85-90
A method is described for the synthesis of bis(3‐aryl‐1‐hexahydropyrimidinyl)methanes 1, by condensation of N‐aryl‐1,3‐propanediarnines 2 with formaldehyde. The reaction mechanism involves N‐arylhexahydropyrimidines 3 as intermediates. Such compounds can also be prepared efficiently by a methylene exchange reaction between bis‐hexahydropyrimidines 1 and the corresponding diamines 2. The antimicrobial activity of compounds 1 was evaluated by the disk diffusion method and some of them showed moderate to good growth inhibition activity. 相似文献
4.
Four C-2 unsubstituted naphtho[2,3-b]furan-4,9-quinones were prepared via the corresponding phthalides obtained by directed ortho-metalation-based route. 相似文献
5.
We show a large deviations principle for the family of random variables
when t+, where B=(B
u
,u0) is a standard linear Brownian motion. 相似文献
6.
Background
There is fMRI evidence that women are neurally predisposed to process infant laughter and crying. Other findings show that women might be more empathic and sensitive than men to emotional facial expressions. However, no gender difference in the brain responses to persons and unanimated scenes has hitherto been demonstrated. 相似文献7.
The naturally-occuring furanonaphthoquinone 1e have been synthesized in good overall yield by a route involving directed ortho metalation (Scheme 1, 1 → 2). 相似文献
8.
Xheila Yzeiri Massimo Calamante Alessio Dessì Daniele Franchi Andrea Pucci Francesco Ventura Gianna Reginato Lorenzo Zani Alessandro Mordini 《Molecules (Basel, Switzerland)》2021,26(18)
Organic fluorophores have found broad application as emitters in luminescent solar concentrators (LSCs) for silicon photovoltaics. In particular, the preparation of organic conjugated systems with intense light-harvesting ability, emissions in the deep-red and NIR regions, and large Stokes shift values represent a very challenging undertaking. Here, we report a simple and easy way to prepare three symmetrical donor–acceptor–donor (DAD) organic-emitting materials based on a thienopyrazine core. The central core in the three dyes was modified with the introduction of aromatic substituents, aiming to affect their optical properties. The fluorophores were characterized by spectroscopic studies. In all cases, visible-NIR emissions with large Stokes shifts were found, highlighting these molecules as promising materials for the application in LSCs. 相似文献
9.
The main purpose of this paper is to show, in the two-dimensional torus, a necessary and sufficient condition in order to certain perturbations of zero order of a system of constant real vector fields to be globally s-solvable. We are also interested in studying its global s-hypoellipticity. We present connections between these global concepts and a priori estimates. We also present two applications of our results for systems of operators with variable coefficients. 相似文献
10.
We prove a functional large deviations principle for the family of random functions
, where { Zt, t ∈, [0, 1]} is a real-valued centered Gaussian process. Bibliography: 19 titles.
Published in Zapiski Nauchnykh Seminarov POMI, Vol. 328, 2005, pp. 169–181. 相似文献