Optimal operation of a reaction-absorption process for ammonia production at low pressure

O Andrés-Martínez, Q Zhang… - Industrial & Engineering …, 2023 - ACS Publications
Renewable ammonia from wind and solar power has significant potential for
decarbonization efforts, despite technical and economic challenges. A promising low …

Optimal darwinian selection of microorganisms with internal storage

W Djema, T Bayen, O Bernard - Processes, 2022 - mdpi.com
In this paper, we investigate the problem of species separation in minimal time. Droop model
is considered to describe the evolution of two distinct populations of microorganisms that are …

Turnpike property in optimal microbial metabolite production

JB Caillau, W Djema, JL Gouzé, S Maslovskaya… - Journal of Optimization …, 2022 - Springer
We consider the problem of maximization of metabolite production in bacterial cells
formulated as a dynamical optimal control problem (DOCP). According to Pontryagin's …

[PDF][PDF] Optimal bacterial resource allocation: metabolite production in continuous bioreactors

AG Yabo, JB Caillau, JL Gouzé - Mathematical Biosciences and …, 2020 - inria.hal.science
We show novel results addressing the problem of synthesizing a metabolite of interest in
continuous bioreactors through resource allocation control. Our approach is based on a …

Stabilization of the chemostat system with mutations and application to microbial production

T Bayen, J Coville, F Mairet - Optimal Control Applications and …, 2023 - Wiley Online Library
In this article, we consider the chemostat system with n≥ 1 n ≥ 1 species, one limiting
substrate, and mutations between species. Our objective is to globally stabilize the …

Optimal control of a bioeconomic model applied to the recovery of household waste*

OC Dekkaki, W Djema - 2023 American Control Conference …, 2023 - ieeexplore.ieee.org
An improved mathematical model describing the process of generating energy from
household waste treatment is proposed and analyzed. It is a three-dimensional nonlinear …

Optimal control of microalgae culture accounting for photoinhibition and light attenuation

W Djema, O Bernard - IFAC-PapersOnLine, 2023 - Elsevier
In a photobioreactor, due to the gradient of light, microalgae are successively exposed to
conditions of low and high (inhibiting) light. This phenomenon can be captured by the Han …

A practical cell density stabilization technique through drug infusions: a simple pathfinding approach

W Djema, C Bonnet, H Özbay… - 2023 European Control …, 2023 - ieeexplore.ieee.org
We consider a nonlinear system with distributed delays modeling cell population dynamics,
where the parameters depend on growth-factor concentrations. A change in one of the …

Optimal Control of Waste Recovery Process

O Cherkaoui-Dekkaki, W Djema, N Raissi… - Authorea …, 2024 - advance.sagepub.com
As society transitions away from fossil fuels towards renewable energy sources, finding
alternatives that are reliable becomes imperative. Waste-to-energy bioprocesses are …

Optimal control of microalgae culture accounting for photoinhibition and light attenuation⋆

I Fierro, W Djema, O Bernard - IFAC World Congress 2023 …, 2023 - inria.hal.science
In a photobioreactor, due to the gradient of light, microalgae are successively exposed to
conditions of low and high (inhibiting) light. This phenomenon can be captured by the Han …