Aix-Marseille University,A decade of exploring

Job offers Post-doctoral fellows

The institute finances up to four post-doctoral fellows for a period of 12 months starting in October 2022

Call for applications CLOSED - Offers filled

Biofouling in micro-irrigation and reuse of treated wastewater

The research topic concerns the study of the dynamics of biofilm development in micro/milli fluidic labyrinth systems. In a context of increasing water stress and competition on water resources for agriculture, micro irrigation systems are recommended for several years. These systems allow to reach an increased efficiency of water supply at the level of the exploited plot but this efficiency can be questioned rather drastically by the presence of nutrients and ions in the irrigation water and in particular in the case of the reuse of treated wastewater which increases the possibility of development of biofilms in the drippers (...)

Hop, Hop, Hopf: Localization, continuation of periodic branches, linear stability analyses at Hopf bifurcation points and in their neighborhood, for (very) large DAE systems

Nonlinear problems are characterized by a possible variability in the existence of their solution(s) in certain ranges of values of the control parameter. Within the range of existence of solution(s), there may also exist a variability in the number of these solutions. In this last case, it becomes then appropriate to study the stability of these solutions, to be able to predict their temporal persistence in real operating conditions. Indeed, the Hopf bifurcations correspond to the solution points for which there is an intersection of the branches of stationary and periodic solutions (...)

Identification of objects in heterogeneous media via their responses

This project aims at developing a method allowing the identification of an inclusion in a heterogeneous medium, via acoustic measurements. The targeted application is the discrimination of objects buried in the seabed. In the case of the installation of a submarine wind farm, for example, it is necessary to first detect whether inclusions are present in the targeted bottom. Once the detection is done, it is fundamental to be able to distinguish between a rock or a historical explosive device from the first two world wars, which are still very present on the French coasts (...)

Stochastic model for the prediction of the lifetime of adhesives for composite materials: application to offshore wind turbines

This post-doctoral project aims at proposing statistical methods for predicting the lifetime of offshore wind turbines components to help maintenance decision making. Predicting the service life or the level of material degradation of a wind turbine is essential to ensure an acceptable level of energy production. A relevant prediction is essential for the planning of maintenance operations especially when these materials are used in the extreme environmental conditions to which offshore wind turbines are subjected (...)

Modeling stress markers on valve bioprostheses

The human heart can be considered as a complex system which by its functioning allows the circulation of blood from veins to arteries. It relies on the functioning of four valves ensuring that the blood circulates in a unidirectional circuit avoiding the circulation in the opposite direction. The malfunctioning of these valves is at the origin of many pathologies. The aortic valve alone accounts for 200,000 surgical operations per year worldwide. Mechanical valves have been designed to replace these valves, made of durable and strong materials.

Self-regulated flows emerging from active deformations

From vascular systems in animals [1-3] and plants [4] to microfluidics [6] and soft robotics [7, 8], liquid transport in channel networks is one of the most efficient ways to deliver functional liquids and actuate soft membranes over large scales and complex geometries. In all of these examples, a key element of these transports is the ability to rapidly reorient fluid flows in different parts of the networks to enable key functionalities such as locomotion [7], feeding [9], muscle actuation[3], etc.
To this end, the most adaptable living systems [1, 2, 10] are based on distributed feedback loops in which the channels are able to contract under local stimuli and thus self-regulate (i.e. adapt to local constraints) the amplitude and direction of liquid flows in the channel network (...)

Topological Anderson insulators with acoustic waves

Metamaterials is now a rich and mature field of research, with a wide range of potential applications for mechanical waves. One can think of the possibilities in waveguiding, for instance to redirect seismic energy to a target location, or in isolation for soundproofing. These artificial materials usually rely on a given periodic structure, which gives the waves exotic propagation properties. A key question in this context is whether these properties are maintained in the presence of irregularities or defects. In the last decade, the field of topological wave insulators has emerged from analogies with electrons in metals, to realize wave guiding with strong robustness against defects1. Within this class of structures, a very peculiar one has been predicted called the Topological Anderson Insulator (TAI). In this type of structure, the waveguiding properties arise because of disorder, making it inherently robust to fabrication defects and imperfections (...)

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