Search results for "Etude"
showing 10 items of 68 documents
Soil erosion processes in European vineyards: A qualitative comparison of rainfall simulation measurements in Germany, Spain and France
2016
Small portable rainfall simulators are considered a useful tool to analyze soil erosion processes in cultivated lands. European research groups in Spain (Valencia, Málaga, Lleida, Madrid and La Rioja), France (Reims) and Germany (Trier) have used different rainfall simulators (varying in drop size distribution and fall velocities, kinetic energy, plot forms and sizes, and field of application) to study soil loss, surface flow, runoff and infiltration coefficients in different experimental plots (Valencia, Montes de Málaga, Penedès, Campo Real and La Rioja in Spain, Champagne in France and Mosel-Ruwer valley in Germany). The measurements and experiments developed by these research teams give…
Le déploiement d'un pilotage stratégique des coûts dans les services informatiques de deux groupes internationaux : perspective instrumentale et anal…
2011
This article analyses the strategic cost management stream with an instrumental point of view and two case studies. We try to show in what extend the Activity-based Costing developments could be included in a strategic approach of the management accounting and to test if the ABC is a relevant tool to drive the strategy. The first part synthesizes the strategic cost management developments which try to improve the Activity-based Costing method. In the first part, we describe them using the Strategic Management Accounting stream, with a link with cost management and ABC. The second part exposes a taxonomy of the reasons why using the ABC method. In a third part, we confront our developments t…
« After buying ...before consuming »: a study of accumulation behaviour through the example of red win e consumers
2017
The main objective of this research is to help better understand a transitory behaviour –halfway between wine buying and consuming –namely accumulation. Data is gathered among a sample of 415 consumers, living in the cities of Lyon and Dijon and quantitative analysis is conducted. Respondents were invited to provide informations about Red wine bottles and appellations ’number they own . Socio-demographic variables’ influence on accumulation behaviour is measured and accumulators typology is analyzed : three main profiles have emerged. They are characterized by red wine bottles’ number and appellations owned, age and city of residence.
Collision de similaritons optiques dans un amplificateur optique fibré Raman
2005
National audience; Nous abordons les aspects théoriques et expérimentaux de la génération et propagation de deux similaritons optiques de fréquences centrales différentes dans un amplificateur optique fibré Raman à dispersion normale. Nous observons les effets intervenant durant la collision des deux similaritons: un battement sinusoïdal apparaît dans la zone de recouvrement temporel des impulsions et des effets de la modulation de phase croisée modifient le spectre des similaritons. Les similaritons retrouvent néanmoins, après collision, leurs caractéristiques paraboliques.
Biofonctionnements des sols tropicaux et mode de gestion des terres
2000
L'effet de deux peuplements de nématodes phytoparasites a été étudié en conditions contrôlées sur la croissance du mil (#Pennisetum glaucum$). Les plants de mil (cv. IKMV 8201) ont été cultivés en pots sur du col collecté au Sud du Sénégal dans un champ cultivé (sol cultivé) et dans une jachère de 17 ans (sol de jachère). La moitié du sol de chacun des prélèvements à été stérilisée. Pour compenser l'effet de la stérilisation, six cycles de cultures de mil de deux mois ont été faits avant l'expérimentation. A l'issu de cette période, trois espèces ont été observées sur le sol cultivé non stérilisé : #Scutellonema cavanessi$, #Tylenchorhynchus gladiolatus$ et #Ditylenchus myceliophagus$, dans…
Pleurotus ostreatus volatile aroma compounds identified from fruit-body and from mycelium grown in submerged and solid-state cultures
2003
Comparative analyses of volatile aroma compounds of the Pleurotus ostreatus JMO.95 fruit-body and its corresponding mycelium grown in liquid, on agar surface, or on solid support cultures have been carried out by dynamic headspace concentration using GC/MS and GC/sniffing. The aroma of the fruit-body was due essentially to the presence of octan-3-one and, in a lesser extent, to the presence of octan-3-ol. Other compounds, such as oct-l-en-3-ol, oct-l-en, 2-methylbutanol and a-pinene were also present in low concentrations. The comparison of the aromatic spectra of the fruit-body with the aromatic spectra of mycelia obtained under different culture conditions indicated that the main aromatic…
Porphyrines et tétraazamacrocycles dérivés du DOTA : association de deux ligands pour la chélation de métaux d'intérêt en imagerie médicale multimoda…
2012
The goal of my PhD thesis was to synthesize new molecules, which give access to heterobimetallic complexes with interesting properties for multimodal imaging. In this manuscript, several main points have been studied. The first part of this work concerns the synthesis and characterization of ligands. We describe here the synthesis of five new ligands based on the association of one porphyrin and one or several cyclen derivatives. Those ligands are water-soluble. During the synthesis, we have targeted improvements to our work and developed a new synthetic pathway, which allowed us to obtain one ligand incorporating a porphyrin, a cyclen derivative and a free amine function. This function cou…
Elections ordinaires et aménagements constitutionnels
2001
It is widely held that voting in the course of ordinary elections has no significant influence on the constitutional regime or order of a country. At least three powerful arguments are provided in support of that view. First, to claim that, at the same time as they play, players can change the rules is, to say the least, logically puzzling. A second argument refers to the motivations and possibilities of voters : voters, this argument says, are not really interested in constitutional issues and, even if they were, are particularly ill-equiped to understand their implications. The third argument rests on the observation of what obtains in practice : as a matter of fact, constitutional issues…
Sensory analysis with consumers using Free-Comment : analyses, performances and extensions
2021
Free-Comment (FC) consists in panelists describing the products using their own terms. Despite its benefits, notably the circumvention of limitations inherent to pre-established lists of sensory descriptors, FC remains rarely used because its performances are not well documented and its analyses and range of application remain limited. This thesis aims to overpass these limitations, highlighting the benefits and the potency of FC and thus put it in the spotlight for sensory analysis with consumers.For the pretreatment of FC data, a semi-automatized procedure is proposed. It enables the practitioners to extract an a posteriori list of sensory descriptors with a compromise between minimizing …
Les évolutions de la comptabilité de gestion - Essai de positionnement par rapport à la méthode ABC et étude de cas
2009
This paper aims to analyse the instrumentation developments in cost management and to position them upon the general principles of the ABC method and upon a case study. In a first part, we study the different uses of cost management according to a literature review about the evolution of the practices. We show that the cost management systems tend to emancipate in several directions. Our purpose in a second part is to analyse these developments comparing them to the general principles of the ABC method. Our general issue is to wonder if these evolutions show that the ABC method is a common reference which explains the evolutions observed. We finally illustrate our paper with a case study.