Séminaire du projet de recherche

MERE

. 23 Mars 2010 à 16h

Benjamin Ivorra (University Complutense of Madrid, Spain)

Title : On The Modelling And Simulation Of High Pressure Processes And Inactivation Of Enzymes In Food Engineering

Abstract : High pressure processing has turned out to be very effective in order to prolong the shelf life of some foods. This work deals with the modelling and simulation of the effect of the combination of high pressure with thermal treatments on food, considering the enzymatic inactivation that may take place on certain enzymes. The behaviour and stability of this model are checked by various numerical examples. Furthermore, various simplified versions of the model are presented and compared between each other in terms of accuracy and computational time. The models developed provide a useful tool to design suitable industrial equipments and optimize the processes.

Conférences à venir

. 30 Mars 2010 à 16h

Pierre Comon (I3S, CNRS, Nice, France)

Title : Tensor decomposition can help in separating variables

Abstract : Matrices of rank R can be decomposed into a sum of R rank-1 terms in infinitely many ways. Tensors of order 3 are represented by arrays with 3 indices. One of the main striking differences between tensors and matrices is that the decomposition of a rank-R tensor can often be done in a unique way into a sum of R rank-1 terms. It is pointed out that this property can be utilized to decompose a function of 3 variables into a sum of elementary functions whose variables separate. Some applications are shown, including the identification of elementary spectra from the fluorescence spectrum of a mixture. A similar approach might apply for electrophoresis measurements. Other surprising properties of tensors are also emphasized.

. 6 Avril 2010 à 16h

Chloé Deygout (EPI INRA/INRIA MERE, UMR MISTEA, Montpellier)

Title : Studying social interactions and food management in an individual-based model of foraging behaviour

Abstract : Vultures, the only terrestrial vertebrate obligate scavengers alive today, are currently facing a dramatic worldwide decline. The availability of safe food is one of the main issues behind this decline and the use of feeding stations has been widely advocated in recovery programs. However, providing food that is more predictable in time and space than natural food sources could disrupt the ecological scavenging service provided by vultures. We built an individual-based model (IBM) of the daily foraging of Gyps vultures in order to investigate how food management affect scavenging service and foraging efficiency. We studied the possibility that vultures could take into account feeding station location or conspecific direction in addition of using local enhancement which is the main mechanism usually taken into account. Some results and comparisons with information from the main French Gyps fulvus colony will be discussed.

. 13 Avril 2010 à 16h

Sabine Peres (SysDiag, UMR3145, CNRS-BIORAD, Montpellier, France)

Title : BioPsi: a formal description of biological processes based on elementary bricks of actions

Abstract : In the available databases, biological processes are described from molecular and cellular points of view, but these descriptions are represented with text annotations that make difficult to handle them for computation. Consequently, there is an obvious need for formal descriptions of biological processes. A formalism that uses the BioPsi concepts to model biological processes from molecular details to networks will be presented. This computational approach, based on elementary bricks of actions, allows us to calculate on biological functions (e.g. process comparison, mapping structure-function relationships, etc.). Its application will be illustrated with the functional description of the central carbon metabolism network. This computational approach is compatible with detailed biological knowledge and can be applied to different kinds of systems of simulation.

. 20 Avril 2010 à 16h

Patrick Tailliez (EMIP, INRA-UM2, Montpellier, France)

Titre :

Résumé :

. 27 Avril 2010 à 16h

Jean-Pierre Barbot (Laboratoire ECS, ENSEA, et EPI ALIEN, INRIA, Cergy-Pontoise, France)

Titre : Une brève épistémologie de la théorie de l'observation et ses conséquences sur l'observation des systèmes sous Zénon.

Résumé : La première partie de l'exposé fera un historique, forcément partial, de la théorie de l'observation en partant des systèmes linéaires en allant vers les systèmes non linéaires. Le premier parti pris sera, ici, de ne pas parler des systèmes de dimension infinie. A la suite de cet historique, nous en tirerons quelques idées directrices pour observer les systèmes dynamiques hybrides soumis à des phénomènes de Zénon. La synthèse d'un observateur sur l'exemple académique des deux bacs illustrera notre propos. L'exposé ce terminera par une discussion sur les problèmes ouverts en observation et inversion à gauche des systèmes hybrides.

. 4 Mai 2010 à 16h

Robert Lortie (Institut de recherche en biotechnologie du CNRC, Montréal, Canada)

Titre :

Résumé :

. 25 Mai 2010 à 16h

Joshua Weitz (Theoretical Ecology and Quantitative Biology School of Biology, Georgia Tech, USA)

Title :

Abstract :

Conférences précédentes

Année : 2010

Année : 2009