Search results for "Abstract"

Oxidative Dehydrogenation of Ethanol on Gold : Combination of Kinetic Experiments and Computation Approach to Unravel the Reaction Mechanism

2021

Abstract Selective alcohol dehydrogenation on heterogeneous catalysts is a key industrial reaction for production of aldehydes, ketones, and carboxylic compounds. Design of catalysts with improved activity and selectivity requires understanding of the reaction mechanism and kinetics. Herein, experiments, density functional theory (DFT) and kinetic modelling were combined to elucidate the mechanism and kinetics of ethanol oxidative dehydrogenation to acetaldehyde on gold catalysts. Catalytic experiments clearly emphasized the role of oxygen in this reaction. Ethanol conversion was rather independent on the gold cluster size. Formation of minor products, acetic acid and ethyl acetate was stru…

An unexpected ring carboxylation in the electrocarboxylation of aromatic ketones

2006

The electrocarboxylation of various aromatic ketones, carried out in N-methyl-2-pyrrolidone (NMP) in a diaphragmless cell equipped with a carbon cathode and an aluminium sacrificial anode, yielded, among the products, the target hydroxy acids, the corresponding alcohols and pinacols and, quite surprisingly, detectable amounts of substituted benzoic acids and cycloexene carboxylic acids. These compounds arise from a never reported before electrocarboxylation on the aromatic ring, respectively, for substitution of an aromatic hydrogen and from an addition reaction. For example, the electrocarboxylation of acetophenone gave rise to the substituted benzoic acids in ortho, para and meta position…

Cue weighting and task processing in melodic classification

2015

Many studies have considered the role of diverse musical parameters in the perception and cognition of specific musical contexts, yet few attempts have been made to integrate these findings into a general cognitive overview of everyday music listening. This study shifted the focus of research, by considering the importance, the relative weight, of particular parameters of music to individual music listeners, and groups composed of those listeners who had differing levels of formal musical experience. Manipulations in various musical and auditory parameters – melodic contour, metrical accent, instrument timbre, distortion and loudness – in two short melodic phrases, were presented to two gro…

L'audience et l'influence d'une revue mesurée à travers Internet : une application à Finance Contrôle Stratégie

2009

This article aims to show the interest of statistics available on the Internet concerning consultations of abstracts, downloads and citations of articles to assess the attractiveness and influence of a scientific review. This interest is illustrated by the case of the review Finance Contrôle Stratégie on the basis of the statistics provided by Repec and Publish or Perish. Beyond the findings that confirm the good performance of FCS and the usefulness of these statistics for the management of a scientific review, the article also provides insights into the life cycle of an article and the choice of the language of publication.

Proceedings Of The 23Rd Paediatric Rheumatology European Society Congress: Part Two

2017

Proceedings of the 23rd Paediatric Rheumatology European Society Congress: part one

2017

Proceedings of the 24th Paediatric Rheumatology European Society Congress: Part three

2017

Op art et roman virtuel : correspondances entre Escher et Perec

2012

Op art et roman virtuel : correspondances entre Escher et Perec Les structures mathématiques, la notion de réalité comme « humaine illusion », le défi à l’infini et la structure énigmatique qui donne aux œuvres eschériennes la même structure que celle d’un roman policier permettent d’établir des convergences significatives entre le graveur hollandais et Georges Perec. Dans certaines œuvres de Perec, en effet, il est possible de remarquer des références explicites au graveur bien qu’elles constituent la traduction visuelle de l’angoisse du « retour du semblable », du « retour involontaire au même point ». Mais Perec ne se limite pas seulement à citer Escher, puisque certaines de ses œuvres c…

A simple methodology for comparing cost-benefit of traditional, green and cool roofs

2019

Energy policy makers, architects and researchers, when designing new buildings or rehabilitating the existing ones, are engaged in the attempt of limiting the energy needs for climatization (NZEB buildings) and the environmental pressure exerted by buildings (EU Climate Action). The pursuit of this demanding assignment calls for innovative solutions in conceiving the building envelope and its energy systems. Recently, among the most effective tools for improving the energy and environmental performances of buildings, the technical interventions regarding the roofs are gaining a rising attention. Indeed, covers of buildings are responsible of a relevant part of their energy losses and, on th…

Establishing material hygrothermal characteristics via long-term monitoring and best-fit numerical models

2020

Numerical models of heat and moisture transfer for performance forecast of lightweight insulating assemblies require many inputs. These include exterior climate data (i.e. temperature, relative humidity, solar radiation), interior climate data or standard models, transfer coefficients, correct initial conditions, etc. Most importantly, one needs reliable material models. A material model includes porosity, density, heat capacity, but also non-constant properties, such as thermal conductivity, vapor/liquid water diffusivity, sorption curves. These are, in general, difficult to determine, and material database entries often are incomplete, or simply non-existent. However, if one performs long…