Les principaux domaines d’activité du Modelisation Group sont :
L’équipe de recherche s’intéresse à modéliser toute la chaîne de l’énergie, de la production à la consommation, en passant par la distribution et la supervision. Comprendre le fonctionnement physique précis des machines de production permet de rationaliser leur utilisation et les utiliser pour réaliser du stockage. Une partie numérique essentielle vient compléter le travail en proposant des modélisations des réseaux de distribution d’énergie et des systèmes de communication nécessaires à l’optimisation de l’ensemble.
S’appuyant sur tous les domaines de l’ingénierie, les matériaux et les structures innovants connaissent une croissance considérable. Cela implique le développement de nouvelles technologies, notamment celles de fabrication additive, et des matériaux intelligents. L’équipe de recherche participe à ce champ de recherche en mettant l’accent sur trois sujets : la modélisation multi-échelle des matériaux ; l’amélioration des procédés de fabrication additive et la caractérisation des performances des nouveaux matériaux.
La modélisation des fluides complexes concerne tous les fluides qui ne peuvent pas être décrits par les équations de Navier-Stokes. La plupart des problèmes étudiés sont en lien avec la dynamique des fluides complexes et des écoulements polyphasiques notamment les interactions fluide-particule. La recherche développée implique une collaboration interdisciplinaire entre plusieurs domaines scientifiques. Nous proposons une analyse mathématique et numérique de ces fluides ayant des applications industrielles.
L’équipe d’enseignants-chercheurs Modelisation Group
L’ensemble des travaux des enseignants-chercheurs Modelisation Group.
Youcef Amirat; Kamel Hamdache
Homogenization of ferrofluid flow models in porous media with Langevin magnetization law Article de journal
Dans: Journal Of Mathematical Analysis And Applications, vol. 525, no. 1, p. 127129, 2023.
@article{amirat_2247,
title = {Homogenization of ferrofluid flow models in porous media with Langevin magnetization law},
author = {Youcef Amirat and Kamel Hamdache},
url = {https://www.sciencedirect.com/science/article/pii/S0022247X23001324?via%3Dihub},
year = {2023},
date = {2023-09-01},
journal = {Journal Of Mathematical Analysis And Applications},
volume = {525},
number = {1},
pages = {127129},
abstract = {The paper is concerned with the homogenization of the equations describing the flow of a ferrofluid through a heterogeneous porous medium ? in the presence of an applied magnetic field. We discuss two models where the magnetization M is parallel to the magnetic field H. In the first one M and H satisfy the relation M=?01?fH in ?, where ?0 is a positive constant and 1?f is the characteristic function of ?f (the pore space). In the second model, M and H satisfy the Langevin magnetization law M=MsL(b1|H|)|H|1?fH, where L is the Langevin function given by L(x)=1tanh?x?1x, Ms is the saturation magnetization and b1 is a positive physical constant. The velocity and the pressure satisfy the Stokes equation with a Kelvin magnetic force. We perform the homogenization of the equations of each of the two models. Using the two-scale convergence method, we rigorously derive the homogenized equation for the magnetic potential and determine the asymptotic limit of the magnetization. Then we rigorously derive a Darcy law.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
André Fortin; Driss Yakoubi
A very high order discontinuous Galerkin method for the numerical solution of stiff DDEs Article de journal
Dans: Applied Mathematics And Computation, vol. 443, p. 127767, 2023.
@article{fortin_2076,
title = {A very high order discontinuous Galerkin method for the numerical solution of stiff DDEs},
author = {André Fortin and Driss Yakoubi},
url = {https://www.sciencedirect.com/science/article/pii/S0096300322008359},
year = {2023},
date = {2023-04-01},
journal = {Applied Mathematics And Computation},
volume = {443},
pages = {127767},
abstract = {We present a high order discontinuous Galerkin (DG) method for the numerical solution of systems of delay differential equations (DDEs). The method is based on Legendre orthogonal polynomials of high degree k (typically k=10) in each subinterval and is a generalisation to DDEs of a similar method which proved to be very efficient for ordinary differential equations (ODEs). We show how the error can be estimated allowing to control the size of the time step. We also propose a particularly efficient quasi Newton method for the solution of the resulting non linear systems based on a very accurate approximation of the Jacobian matrix that is very easy to implement and with excellent convergence properties. The method is then applied to very stiff systems of DDEs.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Walid Samah; Pascal Clain; François Rioual; Laurence Fournaison; Anthony Delahaye
Review on ice crystallization and adhesion to optimize ice slurry generators without moving components Article de journal
Dans: Applied Thermal Engineering, vol. 223, p. 119974, 2023.
@article{samah_2080,
title = {Review on ice crystallization and adhesion to optimize ice slurry generators without moving components},
author = {Walid Samah and Pascal Clain and François Rioual and Laurence Fournaison and Anthony Delahaye},
url = {https://www-sciencedirect-com.devinci.idm.oclc.org/science/article/pii/S1359431123000030},
year = {2023},
date = {2023-03-01},
journal = {Applied Thermal Engineering},
volume = {223},
pages = {119974},
abstract = {The current climate crisis requires a radical reduction in energy consumption and greenhouse gas emissions. For the refrigeration industry, secondary refrigeration is one of the most accessible solutions to reduce the use of refrigerants with high greenhouse gas content. In addition, the use of low environmental impact two-phase secondary fluids, namely PCM (phase change material) slurries, such as ice slurries and gas hydrate slurries, can limit the electrical energy consumption involved in the process. Currently, the industry's most commonly used ice slurry production systems are scraped surface and supercooling generators. These have some disadvantages, such as maintenance costs and energy consumption. An ice slurry generator is considered efficient if it meets three criteria: continuous production, low energy consumption and reliable operation. Optimizing ice slurry production with generators without moving components (scraped surface) could be a solution to meet these criteria. The objective of this review is to present a critical analysis of ice slurry production optimization methods proposed in the literature. These methods aim either to prevent ice nucleation to produce supercooled water with a high supercooling degree, or to reduce the adhesion of the ice to the generator walls to facilitate its removal by flow or by external forces (gravity and buoyancy).},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Kamel Hamdache; Djamila Hamroun
The Bloch-Torrey limit of a kinetic transport system Article de journal
Dans: Mediterranean Journal Of Mathematics, 2023.
@article{hamdache_2246,
title = {The Bloch-Torrey limit of a kinetic transport system},
author = {Kamel Hamdache and Djamila Hamroun},
url = {https://link.springer.com/article/10.1007/s00009-023-02328-y#citeas},
year = {2023},
date = {2023-02-01},
journal = {Mediterranean Journal Of Mathematics},
abstract = {This work is devoted to highlighting the diffusion of some models of Kinetic-Bloch system by an asymptotic analysis. The limit of the kinetic equation when using the classical diffusion scaling shows that the magnetization field becomes parallel to the magnetic field. For the limit of the magnetization when we use a second scaling of the kinetic equation, we show that the dynamics of the magnetization is driven by the Bloch-Torrey diffusion equation.},
keywords = {},
pubstate = {online},
tppubtype = {article}
}
Thomas Borsoni; Laurent Boudin; Francesco Salvarani
Compactness property of the linearized Boltzmann operator for a polyatomic gas undergoing resonant collisions Article de journal
Dans: Journal Of Mathematical Analysis And Applications, vol. 517, no. 1, p. 126579, 2023.
@article{borsoni_1875,
title = {Compactness property of the linearized Boltzmann operator for a polyatomic gas undergoing resonant collisions},
author = {Thomas Borsoni and Laurent Boudin and Francesco Salvarani},
url = {https://www.sciencedirect.com/science/article/pii/S0022247X22005935?via%3Dihub},
year = {2023},
date = {2023-01-01},
journal = {Journal Of Mathematical Analysis And Applications},
volume = {517},
number = {1},
pages = {126579},
abstract = {In this paper, we investigate a compactness property of the linearized Boltzmann operator in the context of a polyatomic gas whose molecules undergo resonant collisions. The peculiar structure of resonant collision rules allows to tensorize the problem into a velocity-related one, neighbouring the monatomic case, and an internal energy-related one. Our analysis is based on a specific treatment of the internal energy contributions. We also propose a geometric variant of Grad's proof of the same compactness property in the monatomic case.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Nada Chami; Yasmine Salehy; Dennis Burgner; Pascal Clain; Didier Dalmazzone; Anthony Delahaye; Laurence Fournaison
Rheological study of mixed cyclopentane + CO2 hydrate slurry in a dynamic loop for refrigeration systems Article de journal
Dans: Energy, vol. 263, p. 125661, 2023.
@article{chami_1961,
title = {Rheological study of mixed cyclopentane + CO2 hydrate slurry in a dynamic loop for refrigeration systems},
author = {Nada Chami and Yasmine Salehy and Dennis Burgner and Pascal Clain and Didier Dalmazzone and Anthony Delahaye and Laurence Fournaison},
url = {https://www.sciencedirect.com/science/article/pii/S0360544222025476},
year = {2023},
date = {2023-01-01},
journal = {Energy},
volume = {263},
pages = {125661},
abstract = {The use of CO2 hydrates as phase change materials is promising for secondary loop refrigeration, as these compounds present adjustable dissociation temperature that can be higher than 273.15 K and have high enthalpy of dissociation. In the present work, by using various promoters, cyclopentane (CP) in this study, the formation pressure of hydrates may be significantly lowered than CO2 hydrates. For their application as a secondary refrigerant, the rheological properties of mixed CP + CO2 hydrate slurry need to be controlled. The flow properties of CP and mixed CP + CO2 hydrate slurries were studied in a dynamic flow loop at different cyclopentane contents ranging from 3 wt% to 15 wt%, using a capillary viscometer based on Rabinowitch and Mooney equation. Rheological parameters (viscosity, flow behavior...) related to these two slurries were compared. The experimental results demonstrate that CP and mixed CP + CO2 hydrates slurries exhibit a shear thinning behavior and the viscosity values vary between 3 and 12 mPa.s-1 at [100-1000 s?1] for CP hydrates slurries and between 2 and 10 mPa s?1 at [100-1200 s?1] for CP + CO2 hydrates slurries. CP hydrate and CP + CO2 hydrate slurry viscosity is close to that of TBPB hydrate and lower than that of CO2 hydrate. Moreover, mixed CP + CO2 have shown a time-evolution of the rheological behavior.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Walid Samah; Pascal Clain; François Rioual; Laurence Fournaison; Anthony Delahaye
Experimental investigation on the wetting behavior of a superhydrophobic surface under controlled temperature and humidity Article de journal
Dans: vol. 656, p. 130451, 2023.
@article{samah_2025,
title = {Experimental investigation on the wetting behavior of a superhydrophobic surface under controlled temperature and humidity},
author = {Walid Samah and Pascal Clain and François Rioual and Laurence Fournaison and Anthony Delahaye},
url = {https://www.sciencedirect.com/science/article/pii/S0927775722022063},
year = {2023},
date = {2023-01-01},
volume = {656},
pages = {130451},
abstract = {Superhydrophobic surfaces (SHS) are of great interest in various industrial fields. However, the application of these surfaces in cold, humid and submerged environments (as in the case of ice slurry production) sometimes presents problems related to the loss of their superhydrophobic properties. This paper presents an experimental study in order to characterize the wetting behavior of a surface coated with a commercial superhydrophobic "Ultra Ever Dry" (UED) coating at different surface temperatures (from 22 °C to ? 13 °C) and relative humidity (13%, 20%, 30%, 40% and 50%). Three methods are developed to characterize the wetting behavior. The first method consists in depositing a water drop on the cooled superhydrophobic UED surface. The objective is to characterize the static wetting behavior (evolution of contact angles) during the cooling of the surface for different relative humidity. The second method consists in dropping a water drop on the cooled UED superhydrophobic surface with an impact velocity of 1 m s?1. This method allows the dynamic behavior of the wetting (impact and rebound of the drop) to be characterized at different temperatures. The third method, consists in studying the effect of the immersion of the SHS in a volume of water cooled until supercooling then freezing. The aim is to analyze the wetting behavior in immersion at low temperature. The results of the static wetting study show that the superhydrophobic coating loses its non-wetting properties at temperatures below 13 °C for a relative humidity between 13% and 50% due to condensation on the surface. The results of the dynamic wetting study show that the superhydrophobic coating has poor resistance to water drop impact at surface temperatures below 4 °C. The wetting transition from Cassie to Wenzel state in low temperature immersion is caused by ice formation. The wettability state influences the morphology of the ice produced after freezing.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Guillaume Guérard; Soufian Ben Amor; Maxence Choufa; Sonia Djebali; Clement Cornet; Loup-Noé Levy; Hai Tran
Pretopology-based Clustering for Mixed Data Conférence
ROADEF 2023, Rennes , France, 2023.
@conference{guerard_2244,
title = {Pretopology-based Clustering for Mixed Data},
author = {Guillaume Guérard and Soufian Ben Amor and Maxence Choufa and Sonia Djebali and Clement Cornet and Loup-Noé Levy and Hai Tran},
url = {https://roadef2023.sciencesconf.org/436878/document},
year = {2023},
date = {2023-02-01},
booktitle = {ROADEF 2023},
address = {Rennes , France},
abstract = {The energy performance of buildings represents a major issue of the 21st century. Many
solutions have been discussed to improve buildings' energy performance [1, 4], but the actions
to take differ from one building to another. In other words, current solutions are built on
a case-by-case basis and cannot be extrapolated easily. Indeed, it is difficult to find generic
solutions due to their complexity and heterogeneity.
By placing buildings in groups and subgroups, one can define relevant energy optimization
recommendations without auditing each building individually. Because initial labels are not
always defined, clustering is relevant in our case. Since we seek for intrinsic similarities between
groups and subgroups, hierarchical clustering is needed. Buildings are described with mixed
data. They include numerical data such as surface or number of floors, and categorical data like
types of heating or insulation materials. Few clustering algorithms exist for mixed data, and
even fewer are hierarchical. In this article, we present a method for the hierarchical clustering
of mixed data based on pretopology.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Thuy Nguyen
Mechanical behaviour of bio-inspired beam lattice metamaterials Conférence
Colloque national annuel MecaMat, Aussois, France, 2023.
@conference{nguyen_2184,
title = {Mechanical behaviour of bio-inspired beam lattice metamaterials},
author = {Thuy Nguyen},
editor = {MecaMat},
url = {https://aussois2023.sciencesconf.org/},
year = {2023},
date = {2023-01-01},
booktitle = {Colloque national annuel MecaMat},
address = {Aussois, France},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Achraf Kallel; Joseph Fitoussi; Mohammadali Shirinbayani; Abbas Tcharkhtchi
Dans: American Institute of Physics, Fukuoka, Japon, 2023.
@inproceedings{kallel_2221,
title = {Effect of cryogenic conditions on mechanical properties of polypropylene composite (GF50-PP) produced by thermocompression process},
author = {Achraf Kallel and Joseph Fitoussi and Mohammadali Shirinbayani and Abbas Tcharkhtchi},
url = {https://www.pps-37.org/},
year = {2023},
date = {2023-03-01},
booktitle = {American Institute of Physics},
address = {Fukuoka, Japon},
abstract = {The thermocompression molding process allows composites to be made with longer fibers compared to injection molding and extrusion. However, during thermo-compression molding fiber-reinforced composites are exposed to complex effects, which can lead to specific fiber orientation/distribution and therefore affect the mechanical properties. The aim of this work is to study the effect of fiber orientation on the mechanical properties of the long-glass-fiber-reinforced polypropylene (GF50-PP) composite produced by the thermocompression process. Moreover, due to the application of this composite in cold liquid gas storage, it is interesting to study this effect under cryogenic conditions. In this study, composite plates of GF50-PP were cut to analyze the effect of fiber orientations: 0°, 45°, and 90° with respect to the Mold Flow Direction (MFD). After microstructural observations by SEM microscopy and physico-chemical analysis, the mechanical behavior of GF50-PP samples was examined at monotonic tensile loading and tension-tension fatigue at two loading temperatures of 20°C and -70 °C. The results of the tensile tests revealed that the values of stress at break were almost similar at 20°C and -70°C for different fiber orientations of 0°, 45° and 90° and that the temperature effect for the two test conditions is almost insignificant. The tensile-tension fatigue tests at 20°C show the significant effect of the orientation of the fibers when the amplitude of deformation is important. On the other hand, when the amplitude is small, this effect is negligible. In this case, all samples exhibit almost the same behavior. However, during fatigue tests at -70 ° C (cryogenic temperature), the material shows almost uniform linear behavior, but still sensitive to the orientation of the fibers.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Perla Nohra; Helmi Ben Rejeb; Swaminath Venkateswaran
Impact of automation during innovative remanufacturing processes in circular economy Inproceedings
Dans: 2022 IEEE 28th International Conference on Engineering, Technology and Innovation (ICE/ITMC) & 31st International Association For Management of Technology (IAMOT) Joint Conference, IEEE, Nancy, France, 2023, ISBN: 978-1-6654-8817-4.
@inproceedings{nohra_1814,
title = {Impact of automation during innovative remanufacturing processes in circular economy},
author = {Perla Nohra and Helmi Ben Rejeb and Swaminath Venkateswaran},
url = {https://ieeexplore.ieee.org/document/10033231},
issn = {978-1-6654-8817-4},
year = {2023},
date = {2023-02-01},
booktitle = {2022 IEEE 28th International Conference on Engineering, Technology and Innovation (ICE/ITMC) & 31st International Association For Management of Technology (IAMOT) Joint Conference},
publisher = {IEEE},
address = {Nancy, France},
abstract = {With the increasing demand of raw materials nowadays, and the decrease in supplies, the industrial sector is suffering, while the environment and the society are also indirectly affected. The goal to reach a sustainable development imposes several studies on the economic, environmental and community level. The aim of this paper is to provide an overview of the existing literature on automating remanufacturing, and its impacts on the three pillars of sustainability. The outcomes of this study will reveal the impacts of remanufacturing on sustainability and will conceptualize the impact of using automation and cobots, which are among the key concepts in industry 4.0. The investigation that covers each part of the remanufacturing process will help in formalizing an approach about the automation of such processes and improve the remanufacturing sector towards a more sustainable industry.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Ihab Taleb; Guillaume Guérard; Frédéric Fauberteau; Nga Nguyen
A holonic multi-agent architecture for smart grids Inproceedings
Dans: International Conference on Agents and Artificial Intelligence, Lisbon, Portugal, 2023, ISBN: 978-989-758-547-0.
@inproceedings{taleb_2073,
title = {A holonic multi-agent architecture for smart grids},
author = {Ihab Taleb and Guillaume Guérard and Frédéric Fauberteau and Nga Nguyen},
url = {https://icaart.scitevents.org/},
issn = {978-989-758-547-0},
year = {2023},
date = {2023-02-01},
booktitle = {International Conference on Agents and Artificial Intelligence},
address = {Lisbon, Portugal},
abstract = {The global warming and the increase of fossil fuel prices make the minimization of energy generation an important objective. Thus, smart grids are becoming more and more relevant in a context where we want to regulate the demand according to the available energy. This regulation can be operated thanks to Demand Side Management (DSM) tools. While different models and architectures have been developed for smart grids, only few papers used holonic architectures. For this, we propose in this paper a holonic architecture for smart grids. This type of architectures is relevant to smart grids as it allow the various actors in the grids to work even in the cases of technical problems. Holons in the proposed model are composed of five interconnecting agents that ensure flexibility on the various aspects. This model has been tested and has proven to work on 3 different scenarios. The first scenario simulates a grid in its healthy state. The second one simulates a grid where a region can be disconnected from a blackout for example. The third one simulates a grid with production mismanagement. Results show how the grid distributes the available energy depending on the available production, priorities (if any) and the assurance of the distribution across the various requesting holons.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Ihab Taleb; Guillaume Guérard; Frédéric Fauberteau; Nga Nguyen
A holonic multi-agent architecture for smart grids Inproceedings
Dans: 15th International Conference on Agents and Artificial Intelligence, Lisbon, Portugal, 2023.
@inproceedings{taleb_2237,
title = {A holonic multi-agent architecture for smart grids},
author = {Ihab Taleb and Guillaume Guérard and Frédéric Fauberteau and Nga Nguyen},
url = {http://www.wikicfp.com/cfp/servlet/event.showcfp?copyownerid=90704&eventid=167079},
year = {2023},
date = {2023-02-01},
booktitle = {15th International Conference on Agents and Artificial Intelligence},
address = {Lisbon, Portugal},
abstract = {The global warming and the increase of fossil fuel prices make the minimization of energy generation animportant objective. Thus, smart grids are becoming more and more relevant in a context where we want toregulate the demand according to the available energy. This regulation can be operated thanks to Demand SideManagement (DSM) tools. While different models and architectures have been developed for smart grids,only few papers used holonic architectures. For this, we propose in this paper a holonic architecture for smartgrids. This type of architectures is relevant to smart grids as it allows the various actors in the grids to workeven in the cases of technical problems. Holons in the proposed model are composed of five interconnectingagents that ensure flexibility on the various aspects. This model has been tested and has proven to work on3 different scenarios. The first scenario simulates a grid in its healthy state. The second one simulates agrid where a region can be disconnected from a blackout for example. The third one simulates a grid withproduction mismanagement. Results show how the grid distributes the available energy depending on theavailable production, priorities (if any) and the assurance of the distribution across the various requestingholons.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Hamidreza Vanaei; Anouar El Magri; Mohammadali Rastak; Saeedeh Vanaei; Sébastien Vaudreuil; Abbas Tcharkhtchi
Numerical-Experimental Analysis toward the Strain Rate Sensitivity of 3D-Printed Nylon Reinforced by Short Carbon Fiber Article de journal
Dans: Materials, vol. 15, no. 24, p. 8722, 2022.
@article{vanaei_2061,
title = {Numerical-Experimental Analysis toward the Strain Rate Sensitivity of 3D-Printed Nylon Reinforced by Short Carbon Fiber},
author = {Hamidreza Vanaei and Anouar El Magri and Mohammadali Rastak and Saeedeh Vanaei and Sébastien Vaudreuil and Abbas Tcharkhtchi},
url = {https://doi.org/10.3390/ma15248722},
year = {2022},
date = {2022-12-01},
journal = {Materials},
volume = {15},
number = {24},
pages = {8722},
abstract = {Despite the application of the Additive Manufacturing process and the ability of parts' construction directly from a 3D model, particular attention should be taken into account to improve their mechanical characteristics. In this paper, we present the effect of individual process variables and the strain-rate sensitivity of Onyx (Nylon mixed with chopped carbon fiber) manufactured by Fused Filament Fabrication (FFF), using both experimental and simulation manners. The main objective of this paper is to present the effect of the selected printing parameters (print speed and platform temperature) and the sensitivity of the 3D-printed specimen to the strain rate during tensile behavior. A strong variation of tensile behavior for each set of conditions has been observed during the quasi-static tensile test. The variation of 40 °C in the platform temperature results in a 10% and 11% increase in Young's modulus and tensile strength, and 8% decrease in the failure strain, respectively. The variation of 20 mm·s?1 in print speed results in a 14% increase in the tensile strength and 11% decrease in the failure strain. The individual effect of process variables is inevitable and affects the mechanical behavior of the 3D-printed composite, as observed from the SEM micrographs (ductile to brittle fracture). The best condition according to their tensile behavior was chosen to investigate the strain rate sensitivity of the printed specimens both experimentally and using Finite Element (FE) simulations. As observed, the strain rate clearly affects the failure mechanism and the predicted behavior using the FE simulation. Increase in the elongation speed from 1 mm·min?1 to 100 mm·min?1, results in a considerable increase in Young's modulus. SEM micrographs demonstrated that although the mechanical behavior of the material varied by increasing the strain rate, the failure mechanism altered from ductile to brittle failure.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Sébastien Vaudreuil; Salah Eddine Bencaid; Hamidreza Vanaei; Anouar El Magri
Effects of Power and Laser Speed on the Mechanical Properties of AlSi7Mg0.6 Manufactured by Laser Powder Bed Fusion Article de journal
Dans: Materials, vol. 15, no. 23, p. 8640, 2022.
@article{vaudreuil_2062,
title = {Effects of Power and Laser Speed on the Mechanical Properties of AlSi7Mg0.6 Manufactured by Laser Powder Bed Fusion},
author = {Sébastien Vaudreuil and Salah Eddine Bencaid and Hamidreza Vanaei and Anouar El Magri},
url = {https://doi.org/10.3390/ma15238640},
year = {2022},
date = {2022-12-01},
journal = {Materials},
volume = {15},
number = {23},
pages = {8640},
abstract = {The AlSi7Mg0.6 alloy, with its good tolerance against strain, is used in laser powder bed fusion (LPBF) to produce parts with complex geometries for aerospace engineering. Production of parts with good mechanical strength requires, however, the optimization of laser parameters. This study thus evaluated the influence of scanning speed, laser power, and strategy on several mechanical properties (tensile/resilience/hardness) to identify an optimal processing region. Results have shown the profound influence of laser power and scanning speed on mechanical properties, with a limited influence from the laser strategy. Tensile strength values ranging from 122 to 394 MPa were obtained, while Young's Modulus varied from 17 to 29 GPa, and the elongation at break ranged from 2.1 to 9.8%. Surface plots of each property against laser power and speed revealed a region of higher mechanical properties. This region is found when using 50 µm thick layers for energy densities between 25 and 35 J/mm3. Operating at higher values of energy density yielded sub-optimal properties, while a lower energy density resulted in poor performances. Results have shown that any optimization strategy must not only account for the volumic energy density value, but also for laser power itself when thick layers are used for fabrication. This was shown through parts exhibiting reduced mechanical performances that were produced within the optimal energy density range, but at low laser power. By combining mid-speed and power within the optimal region, parts with good microstructure and limited defects such as balling, keyhole pores, and hot cracking will be produced. Heat-treating AlSi7Mg0.6 parts to T6 temper negatively affected mechanical performances. Adapted tempering conditions are thus required if improvements are sought through tempering.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Salah-Eddine Ouassil Ouassil; Anouar El Magri; Hamidreza Vanaei; Sébastien Vaudreuil
Investigating the effect of printing conditions and annealing on the porosity and tensile behavior of 3D-printed polyetherimide material in Z-direction Article de journal
Dans: Journal Of Applied Polymer Science, vol. Not assigned yet, no. e53353, p. 53353, 2022.
@article{ouassil_2046,
title = {Investigating the effect of printing conditions and annealing on the porosity and tensile behavior of 3D-printed polyetherimide material in Z-direction},
author = {Salah-Eddine Ouassil Ouassil and Anouar El Magri and Hamidreza Vanaei and Sébastien Vaudreuil},
url = {https://doi.org/10.1002/app.53353},
year = {2022},
date = {2022-11-01},
journal = {Journal Of Applied Polymer Science},
volume = {Not assigned yet},
number = {e53353},
pages = {53353},
abstract = {Fused filament fabrication process presents drawbacks in mechanical properties observed when printing in the build direction (Z-direction). Such anisotropic properties will affect the part's performances and have to be minimized during fabrication. This study aims to evaluate the effects of nozzle temperature, printing speed and specimen state (annealed or as-printed) on porosity percentage and tensile properties for 3D printed polyetherimide (PEI) (ULTEM 1010) parts in Z-direction. The results demonstrated that print speed is the most influential process parameter that should be adjusted in consideration with the other printing parameters. The specimens' state did not reveal a noticeable influence, as the amorphous nature of PEI is considered less receptive to annealing. The optimization method to achieve the best results yielded values of 360 °C and 30 mm/s as printing conditions, followed by heat treatment. This was confirmed by porosity measurements, tensile testing, and scanning electron microscopy observations. The best performances of PEI material were 3425.5 MPa, 102 MPa, and 4.30% for Young's modulus, tensile strength, and elongation at break, respectively.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Fatima Benmesbah; Pascal Clain; Olivia Fandino; Véronique Osswald; Laurence Fournaison; Christophe Dicharry; Anthony Delahaye
Calorimetric study of carbon dioxide (CO2) hydrate formation and dissociation processes in porous media Article de journal
Dans: Chemical Engineering Science, vol. 264, p. 118108, 2022.
@article{benmesbah_1960,
title = {Calorimetric study of carbon dioxide (CO2) hydrate formation and dissociation processes in porous media},
author = {Fatima Benmesbah and Pascal Clain and Olivia Fandino and Véronique Osswald and Laurence Fournaison and Christophe Dicharry and Anthony Delahaye},
url = {https://www.sciencedirect.com/science/article/pii/S0009250922006923},
year = {2022},
date = {2022-10-01},
journal = {Chemical Engineering Science},
volume = {264},
pages = {118108},
abstract = {Understanding the formation and dissociation mechanisms of gas hydrate in porous media is important for the development of new energy-efficient and environmentally friendly technologies related to cold storage as they provide significant latent heat and energy density at suitable phase change temperature. The challenge is to understand the interactions between gas hydrates and the chosen storage media in order to assess the operating conditions likely to optimize time and energy consumption in cold production and storage systems. In this work, CO2 hydrates formation and dissociation are investigated in two morphologically different porous materials: sand and silica gels. A calorimetric approach is applied to study both the CO2 hydrate formation kinetics, particularly the induction time, and the amount of hydrate formed for each of the two porous materials. The experiments are performed using a differential thermal analysis device with two identical measuring cells. The present work is focused on assessing the effect of key factors like water saturation, particle size and the morphology of porous media on CO2 hydrate formation and dissociation processes. Overall, the results do not show a statistically significant correlation between these factors and the induction time. Interestingly, the results obtained with dual porous silica gel showed a higher amount of hydrate formed compared to those with sand for similar initial pressure, temperature and water content conditions. This result may be due to the fact that silica gels provide higher surface area due to their smaller particle size (20-45 µm vs 80-450 µm for sand), and the presence of internal pore volume in silica gel particles.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Hamidreza Vanaei; Sofiane Khelladi; Abbas Tcharkhtchi
Roadmap: Numerical-Experimental Investigation and Optimization of 3D-Printed Parts Using Response Surface Methodology Article de journal
Dans: Materials, vol. 15, no. 20, p. 7193, 2022.
@article{vanaei_1962,
title = {Roadmap: Numerical-Experimental Investigation and Optimization of 3D-Printed Parts Using Response Surface Methodology},
author = {Hamidreza Vanaei and Sofiane Khelladi and Abbas Tcharkhtchi},
url = {https://www.mdpi.com/1996-1944/15/20/7193},
year = {2022},
date = {2022-10-01},
journal = {Materials},
volume = {15},
number = {20},
pages = {7193},
abstract = {Several process variables can be taken into account to optimize the fused filament fabrication (FFF) process, a promising additive manufacturing technique. To take into account the most important variables, a numerical-experimental roadmap toward the optimization of the FFF process, by taking into account some physico-chemical and mechanical characteristics, has been proposed to implement the findings through the thermal behavior of materials. A response surface methodology (RSM) was used to consider the effect of liquefier temperature, platform temperature, and print speed. RSM gave a confidence domain with a high degree of crystallinity, Young's modulus, maximum tensile stress, and elongation at break. Applying the corresponding data from the extracted zone of optimization to the previously developed code showed that the interaction of parameters plays a vital role in the rheological characteristics, such as temperature profile of filaments during deposition. Favorable adhesion could be achieved through the deposited layers in the FFF process. The obtained findings nurture motivations for working on the challenges and bring us one step closer to the optimization objectives in the FFF process to solve the industrial challenges.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Anouar El Magri; Hamidreza Vanaei; Salah Eddine Bencaid; Sébastien Vaudreuil
Effects of Laser Power and Hatch Orientation on Final Properties of PA12 Parts Produced by Selective Laser Sintering Article de journal
Dans: Polymers, vol. 14, no. 17, p. 3674, 2022.
@article{el_magri_1958,
title = {Effects of Laser Power and Hatch Orientation on Final Properties of PA12 Parts Produced by Selective Laser Sintering},
author = {Anouar El Magri and Hamidreza Vanaei and Salah Eddine Bencaid and Sébastien Vaudreuil},
url = {https://doi.org/10.3390/polym14173674},
year = {2022},
date = {2022-09-01},
journal = {Polymers},
volume = {14},
number = {17},
pages = {3674},
abstract = {Poly(dodecano-12-lactam) (commercially known as polyamide ?PA12?) is one of the most resourceful materials used in the selective laser sintering (SLS) process due to its chemical and physical properties. The present work examined the influence of two SLS parameters, namely, laser power and hatch orientation, on the tensile, structural, thermal, and morphological properties of the fabricated PA12 parts. The main objective was to evaluate the suitable laser power and hatching orientation with respect to obtaining better final properties. PA12 powders and SLS-printed parts were assessed through their particle size distributions, X-ray diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), a scanning electron microscope (SEM), and their tensile properties. The results showed that the significant impact of the laser power while hatching is almost unnoticeable when using a high laser power. A more significant condition of the mechanical properties is the uniformity of the powder bed temperature. Optimum factor levels were achieved at 95% laser power and parallel/perpendicular hatching. Parts produced with the optimized SLS parameters were then subjected to an annealing treatment to induce a relaxation of the residual stress and to enhance the crystallinity. The results showed that annealing the SLS parts at 170 °C for 6 h significantly improved the thermal, structural, and tensile properties of 3D-printed PA12 parts.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Anouar El Magri; Salah Eddine Bencaid; Hamidreza Vanaei; Sébastien Vaudreuil
Effects of Laser Power and Hatch Orientation on Final Properties of PA12 Parts Produced by Selective Laser Sintering Article de journal
Dans: Polymers, vol. 14, no. 17, p. 3674, 2022.
@article{el_magri_1892,
title = {Effects of Laser Power and Hatch Orientation on Final Properties of PA12 Parts Produced by Selective Laser Sintering},
author = {Anouar El Magri and Salah Eddine Bencaid and Hamidreza Vanaei and Sébastien Vaudreuil},
url = {https://www.mdpi.com/2073-4360/14/17/3674},
year = {2022},
date = {2022-09-01},
journal = {Polymers},
volume = {14},
number = {17},
pages = {3674},
abstract = {Poly(dodecano-12-lactam) (commercially known as polyamide ?PA12?) is one of the most resourceful materials used in the selective laser sintering (SLS) process due to its chemical and physical properties. The present work examined the influence of two SLS parameters, namely, laser power and hatch orientation, on the tensile, structural, thermal, and morphological properties of the fabricated PA12 parts. The main objective was to evaluate the suitable laser power and hatching orientation with respect to obtaining better final properties. PA12 powders and SLS-printed parts were assessed through their particle size distributions, X-ray diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), a scanning electron microscope (SEM), and their tensile properties. The results showed that the significant impact of the laser power while hatching is almost unnoticeable when using a high laser power. A more significant condition of the mechanical properties is the uniformity of the powder bed temperature. Optimum factor levels were achieved at 95% laser power and parallel/perpendicular hatching. Parts produced with the optimized SLS parameters were then subjected to an annealing treatment to induce a relaxation of the residual stress and to enhance the crystallinity. The results showed that annealing the SLS parts at 170 °C for 6 h significantly improved the thermal, structural, and tensile properties of 3D-printed PA12 parts},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Laurent Boudin; Alex Rossi; Francesco Salvarani
A kinetic model of polyatomic gas with resonant collisions Article de journal
Dans: Ricerche Di Matematica, 2022.
@article{boudin_1894,
title = {A kinetic model of polyatomic gas with resonant collisions},
author = {Laurent Boudin and Alex Rossi and Francesco Salvarani},
url = {https://doi.org/10.1007/s11587-022-00733-1},
year = {2022},
date = {2022-09-01},
journal = {Ricerche Di Matematica},
keywords = {},
pubstate = {online},
tppubtype = {article}
}
Fakhrielddine Bader; Mostafa Bendahmane; Mazen Saad; Raafat Talhouk
Dans: Asymptotic Analysis, 2022.
@article{bader_1995,
title = {Microscopic tridomain model of electrical activity in the heart with dynamical gap junctions. Part 2 - Derivation of the macroscopic tridomain model by unfolding homogenization method},
author = {Fakhrielddine Bader and Mostafa Bendahmane and Mazen Saad and Raafat Talhouk},
url = {https://doi.org/10.3233/ASY-221804},
year = {2022},
date = {2022-09-01},
journal = {Asymptotic Analysis},
abstract = {We study the homogenization of a novel microscopic tridomain system, allowing
for a more detailed analysis of the properties of cardiac conduction than the classical bidomain
and monodomain models. In [5], we detail this model in which gap junctions are considered
as the connections between adjacent cells in cardiac muscle and could serve as alternative
or supporting pathways for cell-to-cell electrical signal propagation. Departing from this mi-
croscopic cellular model, we apply the periodic unfolding method to derive the macroscopic
tridomain model. Several diculties prevent the application of unfolding homogenization
results, including the degenerate temporal structure of the tridomain equations and a nonlin-
ear dynamic boundary condition on the cellular membrane. To prove the convergence of the
nonlinear terms, especially those dened on the microscopic interface, we use the boundary
unfolding operator and a Kolmogorov-Riesz compactness's result.},
keywords = {},
pubstate = {online},
tppubtype = {article}
}
Loubna Salhi; Mohammed Seaid; Driss Yakoubi
Well-posedness and numerical approximation of steady convection-diffusion-reaction problems in porous media Article de journal
Dans: Computers & Mathematics With Applications, vol. 124, p. 129-148, 2022.
@article{salhi_1885,
title = {Well-posedness and numerical approximation of steady convection-diffusion-reaction problems in porous media},
author = {Loubna Salhi and Mohammed Seaid and Driss Yakoubi},
url = {https://www.sciencedirect.com/science/article/abs/pii/S0898122122003443},
year = {2022},
date = {2022-08-01},
journal = {Computers & Mathematics With Applications},
volume = {124},
pages = {129-148},
abstract = {We study a class of steady nonlinear convection-diffusion-reaction problems in porous media. The governing equations consist of coupling the Darcy equations for the pressure and velocity fields to two equations for the heat and mass transfer. The viscosity and diffusion coefficients are assumed to be nonlinear depending on the temperature and concentration of the medium. Well-posedness of the coupled problem is analyzed and existence along with uniqueness of the weak solution is investigatedbased on a fixed-point method. An iterative scheme for solving the associated fixed-point problem is proposed and its convergence is studied. Numerical experiments are presented for two examples of coupled convection-diffusion-reaction problems. Applications to radiative heat transfer and propagation of thermal fronts in porous media are also included in this study. The obtained results show good numerical convergence and validate the established theoretical estimates.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Mofdi El-Amrani; Loubna Salhi; Mohammed Seaid; Driss Yakoubi
An iterative scheme for solving acoupled Darcy-convection-diffusion model Article de journal
Dans: Journal Of Mathematical Analysis And Applications, vol. 517, no. 2, p. 1-24, 2022.
@article{el-amrani_1887,
title = {An iterative scheme for solving acoupled Darcy-convection-diffusion model},
author = {Mofdi El-Amrani and Loubna Salhi and Mohammed Seaid and Driss Yakoubi},
url = {https://www.sciencedirect.com/science/article/pii/S0022247X22006175},
year = {2022},
date = {2022-08-01},
journal = {Journal Of Mathematical Analysis And Applications},
volume = {517},
number = {2},
pages = {1-24},
abstract = {We present an iterative scheme for the numerical analysis of a class of coupled Darcy-convection-diffusion problems modelling flow and heat transfer in porous media. The governing equations consist of the Darcy equations for the flow coupled to a convection-diffusion equation for heat transfer with nonlinear viscosity and diffusion coefficient depending on the temperature. Existence and uniqueness of the weak solution for the considered problem are first analyzed using a fixed-point method and then convergence study of two iterative schemes for the fixed-point algorithm is presented. Two numerical examples are selected to validate the theoretical estimates and to demonstrate the performance of the proposed algorithm. The obtained results support our theoretical expectations for a good numerical convergence with the developed estimates.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Youcef Amirat; Kamel Hamdache; Vladimir V. Shelukhin
Homogenization of MHD flows in porous media Article de journal
Dans: Journal Of Differential Equations, vol. 339, no. 339, p. 90-133, 2022.
@article{amirat_1963,
title = {Homogenization of MHD flows in porous media},
author = {Youcef Amirat and Kamel Hamdache and Vladimir V. Shelukhin},
url = {https://doi.org/10.1016/j.jde.2022.08.014},
year = {2022},
date = {2022-08-01},
journal = {Journal Of Differential Equations},
volume = {339},
number = {339},
pages = {90-133},
abstract = {The paper is concerned with the homogenization of a nonlinear differential system describing the flow of an electrically conducting, incompressible and viscous Newtonian fluid through a periodic porous medium, in the presence of a magnetic field. We introduce a variational formulation of the differential system equipped with boundary conditions. We show the existence of a solution of the variational problem, and derive uniform estimates of the solutions depending on the characteristic parameters of the flow. Using the two-scale convergence method, we rigorously derive a two-scale equation for the two-scale current density, and a two-pressure Stokes system. We derive, in the case of constant magnetic permeability, an explicit relation expressing the macroscopic velocity as a function of the macroscopic Lorentz force, the pressure gradient, the external body force, and the macroscopic current density, via two permeability filtration ten- sors. When the magnetic field is absent, this relation reduces to the Darcy law.
© 2022 Elsevier Inc. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Fitoussi Joseph; Mohammad Hossein Nikooharf; Achraf Kallel; Mohammadali Shirinbayani
Dans: Applied Composite Materials, vol. 29, no. 3, p. 1-21, 2022.
@article{joseph_1864,
title = {Mechanical Properties and Damage Behavior of Polypropylene Composite (GF50-PP) Plate Fabricated by Thermocompression Process Under High Strain Rate Loading at Room and Cryogenic Temperatures},
author = {Fitoussi Joseph and Mohammad Hossein Nikooharf and Achraf Kallel and Mohammadali Shirinbayani},
url = {https://link.springer.com/article/10.1007/s10443-022-10047-y},
year = {2022},
date = {2022-07-01},
journal = {Applied Composite Materials},
volume = {29},
number = {3},
pages = {1-21},
abstract = {This paper concerns the coupling effect of strain rate and temperature on the damage mechanical properties of the long-glass-fiber-reinforced polypropylene (GF50-PP) composite produced by the thermocompression process. Composite plates of GF50-PP have been employed to study the effect of glass fiber distribution on the mechanical properties of the composites. To achieve this objective the tensile tests have been performed at strain rate range from quasi-static to 100 s?1 at two loading temperatures of 20 °C and -70 °C, while measuring the local deformation through a contactless technique using a high-speed camera. High strain rate tensile tests findings showed that GF50-PP behavior is strongly strain-rate dependent. For instance, the stress damage threshold for three fiber orientations of 0°, 45°, and 90° to the Mold Flow Direction (MFD) was increased, when the strain rate varies from quasi-static (0.001 s?1) to 100 s?1 at two loading temperatures of 20 °C and -70 °C. The experimental methodology was coupled to microscopic observations using SEM to study the damage mechanisms of GF50-PP. The analysis confirms that there are three damage mechanisms: fiber-matrix interface debonding, matrix breakage, and pseudo-delamination between neighboring bundles of fibers.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Antoine Montiel; Thuy Nguyen; Cindy Rountree; Valérie Geertsen; Patrick Guenoun; Daniel Bonamy
Effect of architecture disorder on the elastic response of two-dimensional lattice materials Article de journal
Dans: Physical Review E, vol. 106, no. 1, p. 015004, 2022.
@article{montiel_1922,
title = {Effect of architecture disorder on the elastic response of two-dimensional lattice materials},
author = {Antoine Montiel and Thuy Nguyen and Cindy Rountree and Valérie Geertsen and Patrick Guenoun and Daniel Bonamy},
url = {https://journals.aps.org/pre/abstract/10.1103/PhysRevE.106.015004?ft=1},
year = {2022},
date = {2022-07-01},
journal = {Physical Review E},
volume = {106},
number = {1},
pages = {015004},
abstract = {We examine how disordering joint position influences the linear elastic behavior of lattice materials via numerical simulations in two-dimensional beam networks. Three distinct initial crystalline geometries are selected as representative of mechanically isotropic materials with low connectivity, mechanically isotropic materials with high connectivity, and mechanically anisotropic materials with intermediate connectivity. Introducing disorder generates spatial fluctuations in the elasticity tensor at the local (joint) scale. Proper coarse-graining reveals a well-defined continuum-level scale elasticity tensor. Increasing disorder aids in making initially anisotropic materials more isotropic. The disorder impact on the material stiffness depends on the lattice connectivity: Increasing the disorder softens lattices with high connectivity and stiffens those with low connectivity, without modifying the scaling between elastic modulus and density (linear scaling for high connectivity and cubic scaling for low connectivity). Introducing disorder in lattices with intermediate fixed connectivity reveals both scaling: the linear scaling occurs for low density, the cubic one at high density, and the crossover density increases with disorder. Contrary to classical formulations, this work demonstrates that connectivity is not the sole parameter governing elastic modulus scaling. It offers a promising route to access novel mechanical properties in lattice materials via disordering the architectures.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Loup-Noé Levy; Jérémie Bosom; Guillaume Guérard; Sofiane Ben Amor; Marc Bui; Hai Tran
DevOps Model Appproach for Monitoring Smart Energy Systems Article de journal
Dans: Energies, vol. 15, no. 15, p. 5516, 2022.
@article{levy_1924,
title = {DevOps Model Appproach for Monitoring Smart Energy Systems},
author = {Loup-Noé Levy and Jérémie Bosom and Guillaume Guérard and Sofiane Ben Amor and Marc Bui and Hai Tran},
url = {https://www.mdpi.com/1996-1073/15/15/5516},
year = {2022},
date = {2022-07-01},
journal = {Energies},
volume = {15},
number = {15},
pages = {5516},
abstract = {Energy systems are often socio-technical complex systems that are facing new challenges regarding technological and environmental changes. Because of their complex nature, they cannot be approached solely through analytical modeling, hence the inefficiency of most classical modeling approaches. In this article, a Hybrid Approach based on both systemic and analytical modeling is presented and applied to a case study. From this novel approach, a model?the Multi-Institution Building Energy System?is presented. It allowed us to highlight and detail the need for greater governance of energy systems. The socio-technical solutions identified to answer the issues of governance (Accuracy, Reliability and Fairness) were DevOps methodology and the use of Distributed Microservices Architecture. Based on this framework, the design of a Decision Support System assuring and exploiting state-of-the-art scalable tools for data management and machine learning factories is described in this article. Moreover, we wish to set up the conceptual basis necessary for the design of a generic theoretical framework of optimization applicable to complex socio-technical systems in the context of the management of a shared resource.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Rania M. Himeur; Sofiane Khelladi; Mohamed Abdessamed AIT CHIKH; Hamidreza Vanaei; Idir Belaidi; Farid Bakir
Towards an Accurate Aerodynamic Performance Analysis Methodology of Cross-Flow Fans Article de journal
Dans: Energies, vol. 15, no. 14, p. 5134, 2022.
@article{m._himeur_2099,
title = {Towards an Accurate Aerodynamic Performance Analysis Methodology of Cross-Flow Fans},
author = {Rania M. Himeur and Sofiane Khelladi and Mohamed Abdessamed AIT CHIKH and Hamidreza Vanaei and Idir Belaidi and Farid Bakir},
url = {https://doi.org/10.3390/en15145134},
year = {2022},
date = {2022-07-01},
journal = {Energies},
volume = {15},
number = {14},
pages = {5134},
abstract = {Cross-flow fans (CFFs) have become increasingly popular in recent years. This is due to their use in several domains such as air conditioning and aircraft propulsion. They also show their utility in the ventilation system of hybrid electric cars. Their high efficiency and performance significantly rely on the design parameters. Up to now, there is no general approach that predicts the CFFs' performance. This work describes a new methodology that helps deduce the performance of CFFs in turbomachinery, using both analytical modeling and experimental data. Two different loss models are detailed and compared to determine the performance-pressure curves of this type of fan. The efficiency evaluation is achieved by realizing a multidisciplinary study, computational fluid dynamics (CFD) simulations, and an optimization algorithm combined to explore the internal flow field and obtain additional information about the eccentric vortex, to finally obtain the ultimate formulation of the Eck/Laing CFF efficiency, which is validated by the experimental results with good agreement. This approach can be an efficient tool to speed up the cross-flow fans' design cycle and to predict their global performance.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Abir Ben Abdallah; Achraf Kallel; Abbas Tcharkhtchi; Tarek Hassine; Fehmi Gamaoun
Modeling of viscoelastic behavior of a shape memory polymer blend Article de journal
Dans: Journal Of Applied Polymer Science, vol. 139, no. 13, p. 51859, 2022.
@article{ben_abdallah_1721,
title = {Modeling of viscoelastic behavior of a shape memory polymer blend},
author = {Abir Ben Abdallah and Achraf Kallel and Abbas Tcharkhtchi and Tarek Hassine and Fehmi Gamaoun},
url = {https://onlinelibrary.wiley.com/doi/10.1002/app.51859},
year = {2022},
date = {2022-05-01},
journal = {Journal Of Applied Polymer Science},
volume = {139},
number = {13},
pages = {51859},
abstract = {Shape memory effect (SME) of polymers is a property that concerns both,
macroscopic and microscopic changes. The variation of internal polymer
properties such, as molecular weight (Mw), rigidity, and viscoelasticity could
alter its SME. In this study, a bi-parabolic model with six parameters is used to
describe the viscoelastic behavior of a shape memory polymer (SMP) blend
(40% poly(caprolactone), PCL/60% Styrene-Butadiene-Styrene) with different
PCL Mw. These parameters are determined using the Cole-Cole method.
Modeling curves (E00 = f (E0)) will be then compared to experimental data from
dynamical mechanical analysis (DMA) tests. It is shown that the bi-parabolic
model predicts well the behavior of the SMP mixture for different Mw of PCL.
Afterwards, the evolution of the model parameters with the Mw of PCL is
investigated. It is revealed that, when Mw of PCL drops, the relaxation modulus
E0 increases. This result proves that the rigidity of the SMP blend rises with
Mw declines.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Laurent Boudin; Francesco Salvarani; Emmanuel Trélat
Exponential Convergence Towards Consensus for Non-Symmetric Linear First-Order Systems in Finite and Infinite Dimensions Article de journal
Dans: Siam Journal On Mathematical Analysis, vol. 54, no. 3, p. 2727-2752, 2022.
@article{boudin_1819,
title = {Exponential Convergence Towards Consensus for Non-Symmetric Linear First-Order Systems in Finite and Infinite Dimensions},
author = {Laurent Boudin and Francesco Salvarani and Emmanuel Trélat},
url = {https://epubs.siam.org/doi/abs/10.1137/21M1416102},
year = {2022},
date = {2022-05-01},
journal = {Siam Journal On Mathematical Analysis},
volume = {54},
number = {3},
pages = {2727-2752},
abstract = {We consider finite and infinite-dimensional first-order consensus systems with time- constant interaction coefficients. For symmetric coefficients, convergence to consensus is classically established by proving, for instance, that the usual variance is an exponentially decreasing Lyapunov function. We investigate here the convergence to consensus in the non-symmetric case: we identify a positive weight which allows us to define a weighted mean corresponding to the consensus and obtain exponential convergence towards consensus. Moreover, we compute the sharp exponential decay rate.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Ihab Taleb; Guillaume Guérard; Nga Nguyen; Frédéric Fauberteau
A Flexible Deep Learning Method for Energy Forecasting Article de journal
Dans: Energies, vol. 15, no. 11, p. 3926, 2022.
@article{taleb_1836,
title = {A Flexible Deep Learning Method for Energy Forecasting},
author = {Ihab Taleb and Guillaume Guérard and Nga Nguyen and Frédéric Fauberteau},
url = {https://www.mdpi.com/1996-1073/15/11/3926},
year = {2022},
date = {2022-05-01},
journal = {Energies},
volume = {15},
number = {11},
pages = {3926},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Sarra Maarouf; Christine Bernardi; Driss Yakoubi
Characteristics/finite element analysis for two incompressible fluid flows with surface tension using level set method Article de journal
Dans: Computer Methods In Applied Mechanics And Engineering, vol. 394, p. 114843, 2022.
@article{maarouf_1803,
title = {Characteristics/finite element analysis for two incompressible fluid flows with surface tension using level set method},
author = {Sarra Maarouf and Christine Bernardi and Driss Yakoubi},
url = {https://www.sciencedirect.com/science/article/pii/S0045782522001530},
year = {2022},
date = {2022-03-01},
journal = {Computer Methods In Applied Mechanics And Engineering},
volume = {394},
pages = {114843},
abstract = {In this paper, we present and analyze a finite element level set method based on the method of characteristics for two phase
flow. Surface tension effects are taken into account by the CSF approach. We first write the variational formulation of the problem and investigate its well-posedness. Next, for the discretization, a first order method of characteristics approach for the
evolution of the level set function and for the material derivative of the velocity is used. The velocity and pressure unknowns
are discretized by P2? P1 Taylor-Hood finite elements. Then, in each time step, the interface transport is decoupled from the
Navier-Stokes equations. Well-posedness results for subproblems in this decoupled discrete problem are derived. Furthermore,
under high regularity assumptions, we state error estimates for our scheme. Ultimately, three computational examples illustrate
the performance of the proposed method.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Baye Gueye Thiam; Anouar El Magri; Hamidreza Vanaei; Sébastien Vaudreuil
3D Printed and Conventional Membranes?A Review Article de journal
Dans: Polymers, vol. 14, no. 5, p. 1023, 2022.
@article{gueye_thiam_2098,
title = {3D Printed and Conventional Membranes?A Review},
author = {Baye Gueye Thiam and Anouar El Magri and Hamidreza Vanaei and Sébastien Vaudreuil},
url = {https://doi.org/10.3390/polym14051023},
year = {2022},
date = {2022-03-01},
journal = {Polymers},
volume = {14},
number = {5},
pages = {1023},
abstract = {Polymer membranes are central to the proper operation of several processes used in a wide range of applications. The production of these membranes relies on processes such as phase inversion, stretching, track etching, sintering, or electrospinning. A novel and competitive strategy in membrane production is the use of additive manufacturing that enables the easier manufacture of tailored membranes. To achieve the future development of better membranes, it is necessary to compare this novel production process to that of more conventional techniques, and clarify the advantages and disadvantages. This review article compares a conventional method of manufacturing polymer membranes to additive manufacturing. A review of 3D printed membranes is also done to give researchers a reference guide. Membranes from these two approaches were compared in terms of cost, materials, structures, properties, performance. and environmental impact. Results show that very few membrane materials are used as 3D-printed membranes. Such membranes showed acceptable performance, better structures, and less environmental impact compared with those of conventional membranes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Jean Deteix; Gerard Lionel Ndetchoua Kouamoa; Driss Yakoubi
A new energy stable fractional time stepping scheme for the Navier-Stokes/Allen-Cahn diffuse interface model Article de journal
Dans: Computer Methods In Applied Mechanics And Engineering, vol. 393, p. 114759, 2022.
@article{deteix_1802,
title = {A new energy stable fractional time stepping scheme for the Navier-Stokes/Allen-Cahn diffuse interface model},
author = {Jean Deteix and Gerard Lionel Ndetchoua Kouamoa and Driss Yakoubi},
url = {https://www.sciencedirect.com/science/article/pii/S0045782522001104},
year = {2022},
date = {2022-02-01},
journal = {Computer Methods In Applied Mechanics And Engineering},
volume = {393},
pages = {114759},
abstract = {In this work, we present an original time-discrete formulation of the coupled equations relating the velocity and pressure
of an unsteady flow of two immiscible fluids and the Allen-Cahn equation describing the interface between both of them. We
first prove this time-discrete formulation (based on the concept of coupled projection scheme (Deteix et al., 2014)) to be well
posed and energy stable. We then propose a new family of iterative schemes for the actual approximation of solutions. We
complete this work with numerical tests illustrating the order of accuracy and applying the new scheme on the well known
rising bubble benchmark.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Hamidreza Vanaei; Sofiane Khelladi; Deligant Michael; Mohammadali Shirinbayani; Abbas Tcharkhtchi
Numerical Prediction for Temperature Profile of Parts Manufactured using Fused Filament Fabrication Article de journal
Dans: Journal Of Manufacturing Processes, vol. 76, no. 0, p. 548-558, 2022.
@article{vanaei_2095,
title = {Numerical Prediction for Temperature Profile of Parts Manufactured using Fused Filament Fabrication},
author = {Hamidreza Vanaei and Sofiane Khelladi and Deligant Michael and Mohammadali Shirinbayani and Abbas Tcharkhtchi},
url = {https://doi.org/10.1016/j.jmapro.2022.02.042},
year = {2022},
date = {2022-02-01},
journal = {Journal Of Manufacturing Processes},
volume = {76},
number = {0},
pages = {548-558},
abstract = {Bonding of parts produced by fused filament fabrication (FFF) significantly depends on the temperature profile of filaments depositing one top of each other. It is necessary to evaluate the temperature profile during fabrication of structures using both theoretical and experimental approaches. This work describes the overall heat transfer (using finite volume method) that exists in such a process by taking into account the possible phenomena that are developing during the manufacturing sequence: conduction between filaments, conduction between filament and support, and convection with the environment. Although the developed model is general and applicable to both amorphous and semi-crystalline polymers and/or composites, the recordings of temperature variation at the interface of adjacent filaments of a printed vertical wall of PLA illustrated good agreement by implementing very small K-type thermocouples in parallel. It is particularly concerning the occurrence of re-heating peaks during the deposition of new filaments onto previously deposited ones. The sensitivity of the developed code to the operating conditions is shown by variation of several parameters. This makes it easy to apply it for optimization purposes. Theoretical modeling and experimental data presented in this study help better understanding of heat transfer existing in polymer/composite additive manufacturing, and can be valuable to predict more accurately the bond quality and apply the obtained findings for further steps.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Mireille El Haddad; Youssef Belhamadia; Jean Deteix; Driss Yakoubi
A projection scheme for phase change problems with convection Article de journal
Dans: Computers & Mathematics With Applications, vol. 108, no. 1, p. 109-122, 2022.
@article{el_haddad_1795,
title = {A projection scheme for phase change problems with convection},
author = {Mireille El Haddad and Youssef Belhamadia and Jean Deteix and Driss Yakoubi},
url = {https://www-sciencedirect-com.acces.bibl.ulaval.ca/science/article/pii/S0898122122000013?via%3Dihub},
year = {2022},
date = {2022-01-01},
journal = {Computers & Mathematics With Applications},
volume = {108},
number = {1},
pages = {109-122},
abstract = {Numerical modeling of phase change problems with convection is known to be computationally expensive. The main challenge comes from the coupling between Navier-Stokes and heat energy equations. In this paper, we develop a new scheme for phase change problems based on a projection method. The proposed method reduces the size of the system by splitting the temperature, the velocity, and the pressure fields while preserving the accuracy of the simulations. A single-domain approach using a variant of the enthalpy-porosity formulation is employed. Incompressible Navier-Stokes problem with Boussinesq approximation for thermal effects in solid and liquid regions is considered. We regularize the discontinuous variables such as latent heat and material properties by a continuous and differentiable hyperbolic tangent function. The robustness and effectiveness of the proposed scheme are illustrated by comparing the numerical results with numerical and experimental benchmark},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Özgür Gürcan; Johan Anderson; Sara Moradi; Alessandro Biancalani; Pierre Morel
Phase and amplitude evolution in the network of triadic interactions of the Hasegawa-Wakatani system Article de journal
Dans: Physics Of Plasmas, vol. 29, no. 5, p. 052306, 2022.
@article{gurcan_1825,
title = {Phase and amplitude evolution in the network of triadic interactions of the Hasegawa-Wakatani system},
author = {Özgür Gürcan and Johan Anderson and Sara Moradi and Alessandro Biancalani and Pierre Morel},
url = {https://aip.scitation.org/doi/10.1063/5.0089073},
year = {2022},
date = {2022-01-01},
journal = {Physics Of Plasmas},
volume = {29},
number = {5},
pages = {052306},
abstract = {The Hasegawa-Wakatani system, commonly used as a toy model of dissipative drift waves in fusion devices, is revisited with considerations
of phase and amplitude dynamics of its triadic interactions. It is observed that a single resonant triad can saturate via three way phase
locking, where the phase differences between dominant modes converge to constant values as individual phases increase in time. This allows
the system to have approximately constant amplitude solutions. Non-resonant triads show similar behavior only when one of its legs is a
zonal wave number. However, when an additional triad, which is a reflection of the original one with respect to the y axis is included, the
behavior of the resulting triad pair is shown to be more complex. In particular, it is found that triads involving small radial wave numbers
(large scale zonal flows) end up transferring their energy to the subdominant mode which keeps growing exponentially, while those involving
larger radial wave numbers (small scale zonal flows) tend to find steady chaotic or limit cycle states (or decay to zero). In order to study the
dynamics in a connected network of triads, a network formulation is considered, including a pump mode, and a number of zonal and non-
zonal subdominant modes as a dynamical system. It was observed that the zonal modes become clearly dominant only when a large number
of triads are connected. When the zonal flow becomes dominant as a ?collective mean field,? individual interactions between modes become
less important, which is consistent with the inhomogeneous wave-kinetic picture. Finally, the results of direct numerical simulation are dis-
cussed for the same parameters, and various forms of the order parameter are computed. It is observed that nonlinear phase dynamics results
in a flattening of the large scale phase velocity as a function of scale in direct numerical simulations.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Nada Chami; Yasmine Salehy; Pascal Clain; Didier Dalmazzone; Anthony Delahaye; Laurence Fournaison
Thermal and energy evaluation of mixed CP+CO2 hydrate slurries Conférence
5ème Journées annuelles Hydrates, GDR2026, Hydrates de gaz IFPEN, Rueil-Malmaison, France, 2022.
@conference{chami_1910,
title = {Thermal and energy evaluation of mixed CP+CO2 hydrate slurries},
author = {Nada Chami and Yasmine Salehy and Pascal Clain and Didier Dalmazzone and Anthony Delahaye and Laurence Fournaison},
year = {2022},
date = {2022-12-01},
booktitle = {5ème Journées annuelles Hydrates},
address = {IFPEN, Rueil-Malmaison, France},
organization = {GDR2026, Hydrates de gaz},
abstract = {A thermal and energy study of mixed CP + CO2 hydrate slurries is presented to determine the hydrate fraction formed in the loop and to quantify the energy restituted by the mixed hydrate.
The work performed on mixed CP + CO2 hydrate slurries required the establishment of an experimental continuous circulation loop. A heat exchanger is connected to the loop to ensure the hydrates dissociation in order to determine the heat amount involved during the phase change. Thermal studies were also performed to determine the heat exchange coefficients.},
keywords = {},
pubstate = {accepted},
tppubtype = {conference}
}
Véronique Osswald; Pascal Clain; Didier Dalmazzone; Nada Chami; Yasmine Salehy; Anthony Delahaye; Laurence Fournaison
Kinetic study of CO2 hydrates crystallization in stirred tank reactor based on heat balance Conférence
5ème Journées annuelles Hydrates, GDR2026, Hydrates de gaz IFPEN, Rueil-Malmaison, France, 2022.
@conference{osswald_1911,
title = {Kinetic study of CO2 hydrates crystallization in stirred tank reactor based on heat balance},
author = {Véronique Osswald and Pascal Clain and Didier Dalmazzone and Nada Chami and Yasmine Salehy and Anthony Delahaye and Laurence Fournaison},
year = {2022},
date = {2022-12-01},
booktitle = {5ème Journées annuelles Hydrates},
address = {IFPEN, Rueil-Malmaison, France},
organization = {GDR2026, Hydrates de gaz},
abstract = {CO2 hydrate crystallization kinetics monitoring performs traditionally by a reactor mass balance. However, this method requires assumptions on CO2 liquid phase concentration and the number of hydration. This work presents the development of a specific method and device to determine the kinetics through direct measurement of the heat flow through the reactor shell and its evaluation compared with the mass balance method. The kinetic effect of two parameters (stirring speed, stirrer type) is outlined.},
keywords = {},
pubstate = {accepted},
tppubtype = {conference}
}
Yasmine Salehy; Pascal Clain; Nada Chami; Véronique Osswald; Anthony Delahaye; Laurence Fournaison
Rheological analysis of CO2 hydrate slurries in the presence of different additives Conférence
5ème Journées annuelles Hydrates, GDR2026, Hydrates de gaz IFPEN, Rueil-Malmaison, France, 2022.
@conference{salehy_1912,
title = {Rheological analysis of CO2 hydrate slurries in the presence of different additives},
author = {Yasmine Salehy and Pascal Clain and Nada Chami and Véronique Osswald and Anthony Delahaye and Laurence Fournaison},
year = {2022},
date = {2022-12-01},
booktitle = {5ème Journées annuelles Hydrates},
address = {IFPEN, Rueil-Malmaison, France},
organization = {GDR2026, Hydrates de gaz},
abstract = {The rheological properties of OC2 hydrate slurries in the presence of additives are analyzed. The investigations are based on the capillary viscometer method and the experimental studies are conducted in a controled dynamic flow loop allowing to measure the pressure drop and flow rate. Then, the Hershel-Buckley model is used to determine the behavioral properties of the slurries. Finally, a discussion on the assumptions and limitations of this approach is proposed.},
keywords = {},
pubstate = {accepted},
tppubtype = {conference}
}
Swaminath Venkateswaran; Damien Charles Chablat
Stability analysis of tensegrity mechanism coupled with a bio- inspired piping inspection robot Conférence
47ème congrès de la Société de Biomécanique, Monastir, Tunisie, 2022.
@conference{venkateswaran_1843,
title = {Stability analysis of tensegrity mechanism coupled with a bio- inspired piping inspection robot},
author = {Swaminath Venkateswaran and Damien Charles Chablat},
url = {https://arxiv.org/ftp/arxiv/papers/2206/2206.01433.pdf},
year = {2022},
date = {2022-10-01},
booktitle = {47ème congrès de la Société de Biomécanique},
address = {Monastir, Tunisie},
abstract = {Piping inspection robots play an essential role for industries as they can reduce human effort and pose a lesser risk to their lives. Generally, the locomotion techniques of these robots can be classified into mechanical and bioinspired. By using slot-follower leg mechanisms, DC-motors, and control units, a rigid caterpillar type inspection robot was designed and developed at LS2N, France. This rigid prototype helped in identifying the static forces required to
accomplish good contact forces with the pipeline walls. In order to work inside curvatures, a tensegrity mechanism that uses three tension springs and a passive universal joint was introduced between each module of this robot. The optimal parameters of the robot assembly were identified by considering a preload of the cables, which ensured the stability of the entire robot. However, under static conditions, there exist some forces on the robot,
especially on the tensegrity mechanism when one end of the leg mechanism is clamped with the pipeline walls. These forces are dominant when the orientation of the pipeline is horizontal. The objective of this article is to understand the effect of the stiffness of
the spring on the static stability of the tensegrity mechanism under the self-weight of the robot assembly.},
keywords = {},
pubstate = {accepted},
tppubtype = {conference}
}
Ihab Taleb; Guillaume Guérard; Frédéric Fauberteau; Nga Nguyen
A Holonic Smart Grid Model for Isolated Areas Conférence
European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases, PhD Forum, Grenoble, France, 2022.
@conference{taleb_1934,
title = {A Holonic Smart Grid Model for Isolated Areas},
author = {Ihab Taleb and Guillaume Guérard and Frédéric Fauberteau and Nga Nguyen},
url = {https://2022.ecmlpkdd.org/index.php/phd-forum/},
year = {2022},
date = {2022-09-01},
booktitle = {European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases, PhD Forum},
address = {Grenoble, France},
abstract = {Since the beginning of the $21$st century, smart grid models are gaining more and more importance as they play a major role in the demand side management and the flexible integration of renewable energy sources. Indeed, diverse architectures and models have been proposed for smart grids. In this paper, we propose a model composed of two parts, the first part is to optimize, on a weekly scale, thermal generation, and energy storage while prioritizing renewable energy sources to minimize global costs and global warming effects. The second part consists of, having optimized production and storage, the negotiation between neighboring holons on the same level using evolutionary game theory, combined with simulated annealing and Q-learning approaches to ensure a back and forth between the various levels.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Francesco Salvarani
Kinetic description of polyatomig gases undergoing resonant collisions Conférence
Particle Systems and PDEs X, Braga, Portugal, 2022.
@conference{salvarani_1874,
title = {Kinetic description of polyatomig gases undergoing resonant collisions},
author = {Francesco Salvarani},
url = {https://cmat.uminho.pt/events/particle-systems-and-pdes-x},
year = {2022},
date = {2022-07-01},
booktitle = {Particle Systems and PDEs X},
address = {Braga, Portugal},
keywords = {},
pubstate = {accepted},
tppubtype = {conference}
}
Thuy Nguyen; Daniel Bonamy
Effect of atomic-scale solid discreetness in brittle fracture problem Conférence
11th European Solid Mechanics Conference, Galway, Ireland, 2022.
@conference{nguyen_1923,
title = {Effect of atomic-scale solid discreetness in brittle fracture problem},
author = {Thuy Nguyen and Daniel Bonamy},
url = {https://www.esmc2022.org/},
year = {2022},
date = {2022-07-01},
booktitle = {11th European Solid Mechanics Conference},
address = {Galway, Ireland},
abstract = {Material's resistance-to-failure is quantified by two dependent material constants (one is proportional to the square of the other): fracture energy and fracture toughness. Predicting their values from the solid structure at the atomistic scale remains insolved, even in the simplest situation of an ideal brittle fracture. By examining numerically crack growth in electrical analogues of brittle crystals with modulated geometries, we shed a new light on this question. We find that the value of fracture energy cannot be deduced from Griffith's free surface energy, as is generally believed [1]. Rather, it finds its origin in the matching between the continuum-level scale displacement field of solid mechanics and the discrete nature of solids at the atomic scale. By making use of the generic asymptotic form, referred to as Williams's series expansion [2], taken by the displacement field near the crack tip, we find an analytical solution for this matching, and subsequently a way to predict quantitativly fracture toughness from the atomistic parameters [3]. We will discuss how to extend the analysis to genuine elastic (plane stress) crack problems and predict fracture toughness in 2D and 3D materials. This work sheds new perspectives on how resistance-to-faillure is selected; and hence, how it can be improved. As such, it may catalyze novel research toward new architectured materials of superior strcutural performance via microstructure patterning : tougher, more durable, lighter and/or combining other functionalities.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Benjamin Bobbia
Théorème de Donsker pour des mesures empiriques locales sur des régions aléatoires Conférence
53-ème journées de statistique, Lyon, France, 2022.
@conference{bobbia_1855,
title = {Théorème de Donsker pour des mesures empiriques locales sur des régions aléatoires},
author = {Benjamin Bobbia},
year = {2022},
date = {2022-06-01},
booktitle = {53-ème journées de statistique},
address = {Lyon, France},
abstract = {Nowadays, empirical processes are well known objects. A reason that push forward theirs studies is that, in many models, we can write the estimators as images of empirical measures. In this work we investigate the case of local empirical measures built over a sub-sample with data conditioned to be in a certain area. There exists numerous results about such question, but what can we say if the area of interest is data driven ? In the present work we present a general framework which allows to derive asymptotic results for this particular empirical measures (with "low" cost in terms of technicality and assumptions). This approach is mainly presented through the prism of extreme values theory. And we present an example illustrating how this empirical conditional measure assumption work well with optimal transport methods.},
keywords = {},
pubstate = {accepted},
tppubtype = {conference}
}
Achraf Kallel; Joyce Dekran; Abir Ben Abdallah; Sebastien BALLUT
Temperature Evolution of PLA during Filaments FFF process Conférence
3D Printing and Additive Manufacturing 2022, Copenhagen, Denmark, 2022.
@conference{kallel_2222,
title = {Temperature Evolution of PLA during Filaments FFF process},
author = {Achraf Kallel and Joyce Dekran and Abir Ben Abdallah and Sebastien BALLUT},
url = {https://www.thescientistt.com/3dprinting/2022/index.php#important_dates},
year = {2022},
date = {2022-06-01},
booktitle = {3D Printing and Additive Manufacturing 2022},
address = {Copenhagen, Denmark},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Francesco Salvarani
Applied Analysis, Complex Systems & Dynamics Seminar, Graz, Austria, 2022.
@conference{salvarani_1876,
title = {Exponential convergence towards consensus for non-symmetric linear first-order systems in finite and infinite dimensions},
author = {Francesco Salvarani},
url = {x},
year = {2022},
date = {2022-04-01},
booktitle = {Applied Analysis, Complex Systems & Dynamics Seminar},
address = {Graz, Austria},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Benjamin Bobbia
A Dansker's Theorem for data driven local empirical measures Conférence
Séminaire de l'équipe S2A Télécom Paris, Palaiseau, France, 2022.
@conference{bobbia_1856,
title = {A Dansker's Theorem for data driven local empirical measures},
author = {Benjamin Bobbia},
year = {2022},
date = {2022-03-01},
booktitle = {Séminaire de l'équipe S2A Télécom Paris},
address = {Palaiseau, France},
abstract = {Nowadays, empirical processes are well known objects. A reason that push forward theirs studies is that, in many models, we can write the estimators as images of empirical measures. In this work we investigate the case of local empirical measures built over a sub-sample with data conditioned to be in a certain area. There exists numerous results about such question, but what can we say if the area of interest is data driven ? In the present work we present a general framework which allows to derive asymptotic results for this particular empirical measures (with "low" cost in terms of technicality and assumptions). In this talk, this approach is specified for the framework of extreme values theory. In which we presente how tail and quantile estimation can be derived from a such methodology.},
keywords = {},
pubstate = {accepted},
tppubtype = {conference}
}
Benjamin Bobbia
Donsker's Theorem for local Data-Driven Empirical Measure Conférence
Séminaire du laboratoire Modal X, Nanterre, France, 2022.
@conference{bobbia_1773,
title = {Donsker's Theorem for local Data-Driven Empirical Measure},
author = {Benjamin Bobbia},
url = {x},
year = {2022},
date = {2022-02-01},
booktitle = {Séminaire du laboratoire Modal X},
address = {Nanterre, France},
abstract = {Nowadays, empirical processes are well known objects. A reason that push forward theirs studies is that, in many models, we can write the estimators as images of empirical measures. In this work we investigate the case of local empirical measures built over a sub-sample with data conditioned to be in a certain area. There exists numerous results about such question, but what can we say if the area of interest is data driven ? In the present work we present a general framework which allows to derive asymptotic results for this particular empirical measures (with "low" cost in terms of technicality and assumptions). Then, we use this approach in the framework of extreme values theory deriving tail and quantile estimations.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
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