Section: Partnerships and Cooperations

National Initiatives

ANR Soil$\mu 3D$

The team is partner of the ANR project SoilMicro-3D: Emergent properties of soil microbial functions: Upscaling from 3D modeling and spatial descriptors of pore scale heterogeneity, conducted by the UMR EGC for 4 years (2015-19). The other partners are UMR iEES, UMI UMMISCO, SIMBIOS (Scotland), UMR Géosciences Rennes, UMR JJL and UR Inra Science du Sol Orléans). The main goal of the project are

• develop new descriptors of the pore scale 3D soil heterogeneity that explain the fluxes measured at the core scale,

• improve the performance of 3D pore scale models to simulate processes from pores to cores with a reduction of the computational time,

• develop new simple models describing the soil micro-heterogeneity and integrating these micro-features into field-scale models.

The kick-off meeting is held in Jan 2016.

PGMO “OPTIBIO”

OPTIBIO (New challenges in the optimal control of bioprocesses (http://www.math.univ-montp2.fr/~bayen/articles/posterPGMO.pdf )) is a new project funded by the french Fundation FMJH (Fondation Mathématique Jacques Hadamard) in 2014 for three years, within the program PGMO (Gaspard Monge Program for Optimization and operations research).

The project is coordinated by T. Bayen (ACSIOM, Univ. Montpellier II) and the other partners are: MODEMIC, Univ. Limoges, EPI COMMANDS (Saclay) and EPI BIOCORE (Sophia Antipolis).

The overall objective of this project is to address the optimization of bioprocesses over an infinite horizon. Infinite horizon optimal control is well suited for every problem where the time horizon is uncertain and can be expected to be large: e.g. economics models related to optimal growth and sustainable development, biological models such as the optimal control of interacting species and pest control, stabilization of controlled mechanical systems...The recent expectations of sustainable development raise new optimization problems that take into account auxiliary outputs, such as bio-gas production, that were neglected in the past. It appears that mathematical problems that come from the modeling of these processes are often difficult to solve, and one objective of the proposal is to develop new mathematical methods in order to address these issues. More precisely, the objective of the project is to study the following issues:

• Optimization of bioprocess over an infinite horizon.

• Development of accurate methods in order to deal with uncertainties that affects the chemostat model (uncertainties come from unknown parameters or noise from the measurements).

• Stabilization of the chemostat model including delay in the system.

INRA-MIA methodological networks

The team is involved in two new networks of the MIA (Applied Mathematics and Informatics) Department of INRA:

• MEDIA (http://www.netvibes.com/reseaumiamedia ) (Modèles d'Équations DIfférentielles et Autres systèmes dynamiques pour l'écologie),

• REM (https://sites.google.com/site/reseaurem2/ ) (RÉduction de Modèles),

that have been launched last year.