Max Beckmann. Ecrits ; Max Beckmann ; Max Beckmann : l’exposition
نویسندگان
چکیده
منابع مشابه
Cyclopropenium ion catalysed Beckmann rearrangement.
1-Chloro-2,3-diphenylcyclopropenium ion was found to be a very efficient organocatalyst (3 mol% loading) for liquid phase Beckmann rearrangement of various ketoximes to the corresponding amides/lactams within 2 h in acetonitrile at reflux temperature. This is the first example of the application of the cyclopropenium ion as a catalyst, which opens up a new aspect of the synthetic utility of aro...
متن کاملFresnel Correction of the Beckmann Model
In this paper we suggest a modification to the Beckmann-Kirchhoff model of rough surface reflectance that can be used for surfaces of intermediate roughness. One of the problems with the existing Beckmann model is that it fails for large angles of incidence. This problem was overcome for rough surfaces by Vernold and Harvey who use a Lambertian form factor. Here we take this work one step furth...
متن کاملComparing Variants of the Beckmann Model
Abstract Recent work has shown how the Fresnel coefficient can be used to improve the predictions of the Beckmann-Kirchhoff (BK) model for moderatelyrough surfaces. This paper aims to compare the predictions of a number of alternative models including those of Lafortune et al. (LFTG) and Oren-Nayar (ON) against the BRDF measurements from the CUReT database. Excluding the specular reflectance co...
متن کاملKetoximes to N-substituted thioamides via PSCl3 mediated Beckmann rearrangement.
N-Substituted thioamides were accessed from ketoximes by utilising PSCl3 as a uniquely capable reagent to induce Beckmann rearrangement as well as to capture the intermediate nitrilium ion.
متن کاملAn Improved Visible Normal Sampling Routine for the Beckmann Distribution
Recently, Heitz and D’Eon [2014] proposed a method for importance sampling the distribution of visible normals in the context of microfacet BSDF models. One of their sampling routines internally relies on a discontinuous mapping, which can cause problems in conjunction with Quasi Monte Carlo sampling and Markov Chain Monte Carlo integration. In this report, we develop an alternative method that...
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ژورنال
عنوان ژورنال: Critique d’art
سال: 2003
ISSN: 1246-8258,2265-9404
DOI: 10.4000/critiquedart.1963