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.
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 = {online},
tppubtype = {article}
}
Driss Yakoubi; Christine Bernardi; Sarra Maarouf
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, no. XXXX, p. Paper No. 114843, 2022.
@article{yakoubi_1803,
title = {Characteristics/finite element analysis for two incompressible fluid flows with surface tension using level set method},
author = {Driss Yakoubi and Christine Bernardi and Sarra Maarouf},
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},
number = {XXXX},
pages = {Paper No. 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}
}
Driss Yakoubi; Jean Deteix; Gerard Lionel Ndetchoua Kouamoa
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, no. XXXX, p. Paper No. 114759, 25, 2022.
@article{yakoubi_1802,
title = {A new energy stable fractional time stepping scheme for the Navier-Stokes/Allen-Cahn diffuse interface model},
author = {Driss Yakoubi and Jean Deteix and Gerard Lionel Ndetchoua Kouamoa},
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},
number = {XXXX},
pages = {Paper No. 114759, 25},
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}
}
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{yakoubi_1795,
title = {A projection scheme for phase change problems with convection},
author = {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}
}
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 = {2022-01-01},
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}
}
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}
}
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},
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 = {accepted},
tppubtype = {conference}
}
Perla Nohra; Helmi Ben Rejeb; Swaminath Venkateswaran
Impact of automation during innovative remanufacturing processes in circular economy Inproceedings
Dans: 28th IEEE ICE/ITMC & 31st IAMOT Conference IEEE, Nancy, France, 2022, ISBN: TBC.
@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 = {TBC},
issn = {TBC},
year = {2022},
date = {2022-06-01},
booktitle = {28th IEEE ICE/ITMC & 31st IAMOT Conference 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 = {accepted},
tppubtype = {inproceedings}
}
Guillaume Guérard; Ihab Taleb; Nga Nguyen; Frédéric Fauberteau
Modélisation Multi-Agent pour les Réseaux Energétique Insulaires Inproceedings
Dans: Journées Francophones sur les Systèmes Multi-Agents, Saint-Etienne, France, 2022.
@inproceedings{guerard_1831,
title = {Modélisation Multi-Agent pour les Réseaux Energétique Insulaires},
author = {Guillaume Guérard and Ihab Taleb and Nga Nguyen and Frédéric Fauberteau},
year = {2022},
date = {2022-06-01},
booktitle = {Journées Francophones sur les Systèmes Multi-Agents},
address = {Saint-Etienne, France},
keywords = {},
pubstate = {accepted},
tppubtype = {inproceedings}
}
Nada Chami; Pascal Clain; Véronique Osswald; Anthony Delahaye; Laurence Fournaison; Didier Dalmazzone; Yasmine Salehy
Rheological and thermal study of mixed CP + CO2 hydrates for refrigeration applications Inproceedings
Dans: 1th European Conference on Gas Hydrates, Lyon, France, 2022.
@inproceedings{chami_1849,
title = {Rheological and thermal study of mixed CP + CO2 hydrates for refrigeration applications},
author = {Nada Chami and Pascal Clain and Véronique Osswald and Anthony Delahaye and Laurence Fournaison and Didier Dalmazzone and Yasmine Salehy},
url = {https://ecgh2022.sciencesconf.org/},
year = {2022},
date = {2022-06-01},
booktitle = {1th European Conference on Gas Hydrates},
address = {Lyon, France},
abstract = {The use of gas hydrates in secondary refrigeration can reduce cooling environmental impact by greenhouse gas reduction because of there high energy density. CO2 hydrates was selected at previous work as a candidate material for secondary refrigeration. In this study, cyclopentane, a thermodynamic promoter that has been identified for its promotive qualities to lower the formation pressure of CO2 hydrates was used to form mixed CP + CO2 hydrate slurries. This work deploys a temperature-controlled flowloop to characterize the rheological properties of hydrate slurries generated in situ from oil-in-water emulsions. Systems of 3 - 15wt% cyclopentane fraction to form pure CP hydrate and mixed CP + CO2 hydrate slurries were tested. The results showed that the viscosity of CP and mixed CP + CO2 hydrate slurries increase with the decrease of the shear rate, exhibiting a shear-thinning behavior. With a similar protocol, a rheological characterization involving a long period of hydrate slurries circulation was conducted. The results illustrated that the hydrate slurries behavior change with time. A thermal study was performed using heating tube method applied and heat transfer coefficients were determined for different cyclopentane fraction.},
keywords = {},
pubstate = {accepted},
tppubtype = {inproceedings}
}
Véronique Osswald; Pascal Clain; Didier Dalmazzone; Anthony Delahaye; Laurence Fournaison
Experimental heat transfer measurement applied to CO2 hydrate formation kinetic study Inproceedings
Dans: 1th European Conference on Gas Hydrates, Lyon, France, 2022.
@inproceedings{osswald_1850,
title = {Experimental heat transfer measurement applied to CO2 hydrate formation kinetic study},
author = {Véronique Osswald and Pascal Clain and Didier Dalmazzone and Anthony Delahaye and Laurence Fournaison},
url = {https://ecgh2022.sciencesconf.org/},
year = {2022},
date = {2022-06-01},
booktitle = {1th European Conference on Gas Hydrates},
address = {Lyon, France},
abstract = {CO
2 hydrate slurry is a promising phase change material for secondary refrigeration cold distribution
issues, due to its high latent heat (about 500 kJ.kg 1 of water, higher than that of ice 333 kJ.kg 1) and
wide melting temperature range suitable for air c onditioning application. While the thermodynamic
properties of CO 2 hydrates are now well established, knowledge of crystallization kinetics phenomena
is still a challenge. Trying to understand and control the formation of gas hydrates is a key factor since
their discovery in pipeline plugs by Hammerschmidt, but unlike that case, the goal here is to promote
the rate of CO 2 hydrate formation. Most laboratory scale hydrate reactors are equipped with pressure
and temperature loggers, and mass balance on CO 2 all ows formation kinetic studies, but with
assumptions on CO 2 concentration in liquid phase in the liquid phase and the hydration number.
The
present work investigates the kinetics of CO 2 hydrate crystallization for different types of stirrers
and stirring sp eed conditions in a jacketed stirred batch reactor. Heat balance obtain experimentally
using a specially developed sensor installed on the cooling jacket. The mass fraction of crystallized
hydrate determine directly from the heat balance on the cooling jac ket. First, tests on water heating and
cooling steps and ice crystallization allowed the method validation before to apply it to CO 2 hydrate
crystallization. Experimental results described with an empirical model and compared to other mass
balance based ki netic determinations. Finally, the development of a simplified thermal model improved
this kinetic determination by estimating heat fl ows inside the reactor and with the environment.},
keywords = {},
pubstate = {accepted},
tppubtype = {inproceedings}
}
Véronique Osswald; Pascal Clain; Didier Dalmazzone; Laurence Fournaison; Anthony Delahaye
Suivi cinétique de la cristallisation des hydrates de CO2 par mesure thermique - Effet de l'agitation Inproceedings
Dans: CRISTAL 10, Lyon, France, 2022.
@inproceedings{osswald_1851,
title = {Suivi cinétique de la cristallisation des hydrates de CO2 par mesure thermique - Effet de l'agitation},
author = {Véronique Osswald and Pascal Clain and Didier Dalmazzone and Laurence Fournaison and Anthony Delahaye},
url = {http://cristal10.univ-lyon1.fr/fr},
year = {2022},
date = {2022-06-01},
booktitle = {CRISTAL 10},
address = {Lyon, France},
abstract = {Les coulis d'hydrates de CO2 constituent un matériau à changement de phase prometteur pour la distribution du froid en réfrigération secondaire [1], en raison de leur chaleur latente élevée (environ 500 kJ.kg-1 d'eau, supérieure à celle de la glace: 333 kJ.kg-1) et de leur large plage de température de fusion adaptée aux applications de climatisation. Ce sont des structures cristallines proche de la glace, au sein desquelles sont enclathrées des molécules de dioxyde de carbone. Si les propriétés thermodynamiques des hydrates de CO2 sont désormais bien établies, la connaissance des phénomènes cinétiques de cristallisation reste parcellaire [2]. Comprendre et contrôler la formation des hydrates de gaz est un défi depuis leur découverte dans les bouchons de pipeline par Hammerschmidt [3]. Mais contrairement à ce cas, où l'on cherche à retarder l'apparition des hydrates, l'objectif ici est de favoriser leur cristallisation. La plupart des réacteurs dans lesquels est étudiée la cristallisation des hydrates à l'échelle du laboratoire sont équipés d'enregistreurs de pression et de température, et c'est à partir d'un bilan matière sur le CO2, en faisant des hypothèses sur la concentration de CO2 en phase liquide et le nombre d'hydratation, que le suivi de la cinétique est réalisé [4].
L'objet des travaux présentés ici est l'étude de la cinétique de cristallisation des hydrates de CO2 pour différents types d'agitateurs et différentes conditions de vitesse d'agitation dans un réacteur batch agité à double enveloppe. Le bilan thermique est obtenu expérimentalement en utilisant un capteur spécialement développé et installé sur la double enveloppe du réacteur. La fraction massique cristallisée est déterminée directement à partir du bilan thermique sur la double-enveloppe. Des essais sur les étapes de chauffage et de refroidissement de l'eau et la cristallisation de la glace ont permis de valider la méthode avant de l'appliquer à la cristallisation des hydrates de CO2. Les résultats expérimentaux sont décrits à partir d'un modèle empirique et comparés à d'autres déterminations cinétiques basées sur le bilan de matière. Enfin, le développement d'un modèle thermique simplifié du réacteur a permis d'améliorer cette détermination cinétique en estimant les flux de chaleur au sein du réacteur et avec l'environnement.},
keywords = {},
pubstate = {accepted},
tppubtype = {inproceedings}
}
Pascal Clain; Laurence Fournaison; François Rioual; Anthony Delahaye
Dans: 30ème congrès annuel de la Société Française de Thermique, Valenciennes, France, 2022.
@inproceedings{clain_1852,
title = {Étude du comportement de mouillage d'une goutte d'eau sur une surface superhydrophobe en fonction de la température et de l'humidité},
author = {Pascal Clain and Laurence Fournaison and François Rioual and Anthony Delahaye},
url = {http://www.congres-sft.fr/2022/},
year = {2022},
date = {2022-05-01},
booktitle = {30ème congrès annuel de la Société Française de Thermique},
address = {Valenciennes, France},
abstract = {Cet article présente une étude sur le comportement de mouillage d'une gouttes sur une
surface recouverte d'un revêtement superhydrophobe à différentes températures de surface et humidités
relatives. Les résultats montrent que l'évolution des angles de contact pendant le refroidissement des
surfaces est influencée par deux phénomènes : le premier est l'évaporation des gouttes et le second est
la condensation de la vapeur d'eau sur ces surfaces à basse température. Un modèle semi-empirique
de l'évaporation d'une goutte sur une surface superhydrophobe est présenté et comparé aux résultats
expérimentaux.},
keywords = {},
pubstate = {accepted},
tppubtype = {inproceedings}
}
Nada Chami; Sabrina Bendjenni; Pascal Clain; Véronique Osswald; Anthony Delahaye; Laurence Fournaison; Didier Dalmazzone
Thermodynamic characterization of mixed gas hydrates in the presence of cyclopentane as guest molecule for an application in secondary refrigeration Article de journal
Dans: Chemical Engineering Journal, vol. 244, no. -, p. 116790, 2021.
@article{chami_1564,
title = {Thermodynamic characterization of mixed gas hydrates in the presence of cyclopentane as guest molecule for an application in secondary refrigeration},
author = {Nada Chami and Sabrina Bendjenni and Pascal Clain and Véronique Osswald and Anthony Delahaye and Laurence Fournaison and Didier Dalmazzone},
url = {https://www.sciencedirect.com/science/article/pii/S0009250921003559},
year = {2021},
date = {2021-11-01},
journal = {Chemical Engineering Journal},
volume = {244},
number = {-},
pages = {116790},
abstract = {Gas hydrates have drawn the attention of many scientists because of their potential role in energy applications. By using some thermodynamic promoters, it is possible to form hydrates at reduced pressure and near ambient temperature, which are suitable formation conditions for most industries. In this study, a high pressure micro differential scanning calorimeter was used to measure the dissociation conditions of mixed cyclopentane (c-C5H10) + CO2 hydrates in the system composed of liquid water + liquid hydrocarbon + hydrate + vapour, in a pressure range of 0 to 4.3 MPa in a temperature range of 280 to 292 K. The analysis of the heat flow curve allowed the direct determination of the dissociation enthalpy of c-C5H10 + CO2 hydrates (e.g., ?H=462.5±1.5 kJ. kg-1 water at equilibrium pressure 0.25 MPa) and the average mass heat capacity of c-C5H10 + CO2 hydrates in a temperature range o 277.9-281.2 K (CpH = 1479.09 ± 137.43 J. K-1. kg-1 hydrate at 0.25 MPa).},
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. 2021, no. 2021, p. 1-8, 2021.
@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 = {2021},
date = {2021-11-01},
journal = {Journal Of Applied Polymer Science},
volume = {2021},
number = {2021},
pages = {1-8},
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}
}
Guillaume Guérard; Hugo Pousseur; Ihab Taleb
Isolated Areas Consumption Short-Term Forecasting Method Article de journal
Dans: Energies, vol. 14, no. 23, p. 7914, 2021.
@article{guerard_1732,
title = {Isolated Areas Consumption Short-Term Forecasting Method},
author = {Guillaume Guérard and Hugo Pousseur and Ihab Taleb},
url = {https://www.mdpi.com/1996-1073/14/23/7914},
year = {2021},
date = {2021-11-01},
journal = {Energies},
volume = {14},
number = {23},
pages = {7914},
abstract = {Forecasting consumption in isolated areas represents a challenging problem typically resolved using deep learning or huge mathematical models with various dimensions. Those models require expertise in metering and algorithms and the equipment needs to be frequently maintained. In the context of the MAESHA H2020 project, most of the consumers and producers are isolated. Forecasting becomes more difficult due to the lack of external data and the significant impact of human behaviors on those small systems. The proposed approach is based on data sequencing, sequential mining, and pattern mining to infer the results into a Hidden Markov Model. It only needs the consumption and production curve as a time series and adapts itself to provide the forecast. Our method gives a better forecast than other prediction machines and deep-learning methods used in literature review.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Guillaume Guérard; Sofiane Ben Amor; Philippe Charlier; Anais Augias
USoM platform. Proposal for an international and transdisciplinary interactive tool for centralization and anthropological exchange around human remains Article de journal
Dans: ETHICS, MEDICINE AND PUBLIC HEALTH, vol. 18, no. September, p. 1-6, 2021.
@article{guerard_1604,
title = {USoM platform. Proposal for an international and transdisciplinary interactive tool for centralization and anthropological exchange around human remains},
author = {Guillaume Guérard and Sofiane Ben Amor and Philippe Charlier and Anais Augias},
url = {https://www.sciencedirect.com/science/article/pii/S2352552521000542},
year = {2021},
date = {2021-09-01},
journal = {ETHICS, MEDICINE AND PUBLIC HEALTH},
volume = {18},
number = {September},
pages = {1-6},
abstract = {Background
In a previous article related to ethical reflection around the study of human remains and their biological products in archaeological, ethnographic and museum contexts, a general scientific isolation - going against the common interest and leading to certain forms of misconduct - had been raised. It appeared a real need to act in the direction of transparency and a transdisciplinary union.
Methodology
This conclusion led to further reflection on the strengths and technical creation of a tool dedicated to the exchange between sciences relating to the study of man.
Results/Discussion
We propose the creation of a platform dedicated to all international scientific actors whose issues are related to research on humans. This involves proposing the development of a participatory/collaborative virtual platform on which scientific organizations would exchange their study materials, their samples, their tools, their knowledge, their reflections and hypotheses and then the resulting data in order to no longer work in isolation.
Conclusion/Perspectives
This multidisciplinary vision to the study of Man, without spatial or chronological boundaries, will be a contribution to each of the disciplines involved and the benefits of this platform are multiple. However, this coalition approach exposes academic, technical and legal difficulties and represents a real challenge because it requires profound changes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Basma Jaffal-Moutarda
Global existence of the 3D rotating second grade fluid system Article de journal
Dans: Asymptotic Analysis, vol. 124, no. 3-4, p. 259-290, 2021.
@article{jaffal-moutarda_1356,
title = {Global existence of the 3D rotating second grade fluid system},
author = {Basma Jaffal-Moutarda},
url = {https://content.iospress.com/articles/asymptotic-analysis/asy201644},
year = {2021},
date = {2021-08-01},
journal = {Asymptotic Analysis},
volume = {124},
number = {3-4},
pages = {259-290},
abstract = {We consider the equations of a rotating incompressible non-Newtonian fluid flow of grade two in a three dimensional torus. We prove two different results of global existence of strong solutions. In the first case, we consider that the elasticity coefficient ? is arbitrary and we suppose that the third components of the vertical average of the initial data and of the forcing term are small compared to the horizontal components. In the second case, we consider a forcing term and initial data of arbitrary size but we restrict the size of ?. In both cases, we show that the limit system is composed of a linear system and a second grade fluid system with two variables and three components.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Achraf Kallel; Abir Ben Abdallah; Fehmi Gamaoun; Abbas Tcharkhtchi; Hachmi BenDaly; Joseph Fitoussi
Driving force for shape memory effect of polymers Article de journal
Dans: Journal Of Polymer Research, vol. 28, no. 10, p. 308, 2021.
@article{kallel_1585,
title = {Driving force for shape memory effect of polymers},
author = {Achraf Kallel and Abir Ben Abdallah and Fehmi Gamaoun and Abbas Tcharkhtchi and Hachmi BenDaly and Joseph Fitoussi},
url = {https://link.springer.com/article/10.1007/s10965-021-02637-4},
year = {2021},
date = {2021-07-01},
journal = {Journal Of Polymer Research},
volume = {28},
number = {10},
pages = {308},
abstract = {In this study, we aim to evaluate the shape memory effect of a Poly (Caprolactone) (PCL) (40%) and a Styrene-Butadiene-Styrene (SBS) (60%) blend. Shape memory cycle tests are performed at different temperatures to detect the best recovery rate. Under appropriate temperature, the blend recovers substantially its original shape. To study the recovery rate evolution, multi cycle tests are realized with controlled temperature. The results indicate that the shape memory effect growths when the number of cycle increases. The stored energy acts as a driving force to bring the polymer to its permanent shape after each loading cycle. Then, an original method is proposed to measure the stress-strain evolution during the recovery. With a variable temperature, no standard test can follow the stress-strain evolution. This test is needed to validate the behavior model.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Kamel Hamdache; Djamila Hamroun
Macroscopic limit of the kinetic Bloch equation Article de journal
Dans: Kinetic And Related Models, vol. 14, no. 3, p. 541-570, 2021.
@article{hamdache_1579,
title = {Macroscopic limit of the kinetic Bloch equation},
author = {Kamel Hamdache and Djamila Hamroun},
url = {https://www.aimsciences.org/article/doi/10.3934/krm.2021015},
year = {2021},
date = {2021-06-01},
journal = {Kinetic And Related Models},
volume = {14},
number = {3},
pages = {541-570},
abstract = {This work concerns the existence of solution of the kinetic spinor Boltzmann equation as well as the asymptotic behavior of such solution when ??0, that is when the time relaxation of the spin-flip collisions is very small in comparison to the time relaxation parameter of the collisions with no spin reversal. Due to the lack of regularity of the weak solution, the switching term H?×M? is not stable under the weak convergences. Hence we establish new estimates of the so},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Swaminath Venkateswaran; Damien Charles Chablat; Pol Hamon
An optimal design of a flexible piping inspection robot Article de journal
Dans: Journal Of Mechanisms And Robotics-Transactions Of The Asme, vol. 13, no. 3, p. 035002, 2021.
@article{venkateswaran_1788,
title = {An optimal design of a flexible piping inspection robot},
author = {Swaminath Venkateswaran and Damien Charles Chablat and Pol Hamon},
url = {https://asmedigitalcollection.asme.org/mechanismsrobotics/article-abstract/13/3/035002/1096922/An-Optimal-Design-of-a-Flexible-Piping-Inspection},
year = {2021},
date = {2021-06-01},
journal = {Journal Of Mechanisms And Robotics-Transactions Of The Asme},
volume = {13},
number = {3},
pages = {035002},
abstract = {This study presents an optimization approach for the design of a piping inspection robot. A rigid bio-inspired piping inspection robot that moves like a caterpillar was designed and developed at LS2N, France. By the addition of tensegrity mechanisms between the motor modules, the mobile robot becomes flexible to pass through the bends. However, the existing motor units prove to be oversized for passing through pipe bends at 90 deg. Thus, three cascading optimization problems are presented in this article to determine the sizing of robot assembly that can overcome such pipe bends. The first problem deals with the identification of design parameters of the tensegrity mechanism based on static stability. Followed by that, in the second problem, the optimum design parameters of the robot modules are determined for the robot assembly without the presence of leg mechanisms. The third problem deals with the determination of the size of the leg mechanism for the results of the two previous optimization problems. A digital model of the optimized robot assembly is then realized using cad software.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Damien Charles Chablat; Guillaume Michel; Philippe Bordure; Swaminath Venkateswaran; Ranjhan Jha
Workspace analysis in the design parameter space of a 2-dof spherical parallel mechanism for a prescribed workspace: Application to the otologic surgery Article de journal
Dans: Mechanism And Machine Theory, vol. 157, no. 3, p. 104224, 2021.
@article{chablat_1789,
title = {Workspace analysis in the design parameter space of a 2-dof spherical parallel mechanism for a prescribed workspace: Application to the otologic surgery},
author = {Damien Charles Chablat and Guillaume Michel and Philippe Bordure and Swaminath Venkateswaran and Ranjhan Jha},
url = {https://www.sciencedirect.com/science/article/pii/S0094114X20304419},
year = {2021},
date = {2021-03-01},
journal = {Mechanism And Machine Theory},
volume = {157},
number = {3},
pages = {104224},
abstract = {During Otologic surgery, and more broadly during microsurgery, the surgeon encounters several difficulties due to the confined spaces and micro-manipulations. The purpose of the paper is to design a robot with a prescribed regular workspace shape to handle an endoscope to assist the Otologic surgery. A spherical parallel mechanism with two degrees of freedom is analysed in its design parameter space. This mechanism is composed of three legs (2USP-U) to connect the base to a moving platform connected to a double parallelogram to create a remote center of motion (RCM). Its kinematic properties, i.e. the singularity locus and the number of direct kinematic solutions, are investigated. For some design parameters, non-singular assembly modes changing trajectories may exist and have to be investigated inside the prescribed regular workspace shape. Two sets of design parameters are presented with their advantages and disadvantages.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Abir Ben Abdallah; Fehmi Gamaoun; Achraf Kallel; Abbas Tcharkhtchi
Molecular weight influence on shape memory effect of shape memory polymer blend ( poly(caprolactone)/styrene-butadiene-styrene ) Article de journal
Dans: Journal Of Applied Polymer Science, vol. 138, no. 5, p. 49761, 2021.
@article{ben_abdallah_1269,
title = {Molecular weight influence on shape memory effect of shape memory polymer blend ( poly(caprolactone)/styrene-butadiene-styrene )},
author = {Abir Ben Abdallah and Fehmi Gamaoun and Achraf Kallel and Abbas Tcharkhtchi},
url = {https://onlinelibrary.wiley.com/doi/10.1002/app.49761},
year = {2021},
date = {2021-02-01},
journal = {Journal Of Applied Polymer Science},
volume = {138},
number = {5},
pages = {49761},
abstract = {The shape memory effect (SME) does not only concern the macroscopic structure. It concerns also the polymer structure at morphological, macromolecular, and molecular scales. This effect may depend on different physicochemical properties like morphology heterogeneity, chain rigidity, steric hindrance, chain polarity, free volume, cross-linking or entanglement density, molecular shape and weight, and so on. Hence, finding the relationship between the SME and these properties is very important. This can help to obtain the knowledge about the phenomenon origin and mechanism. One of the basic polymer properties, which can have direct SME, may be the molecular weight (Mw). The question here is: If the Mw of a shape memory polymer (SMP) changes, for different reasons like degradation, what will be the effect of this change on its SME. In order to answer to this question, the investigation is focused on an SMP blend of 40% poly(?-caprolactone) (PCL) and 60% styrene-butadiene-styrene (SBS). Then, enzymatic hydrolysis is performed on this blend to change its Mw. It is shown that this change is only related to the variation in the Mw of PCL. After that, different samples with a distinct average Mw are prepared and characterized by various experimental methods. Shape memory tests are performed on these blends, and the recovery rate (Rr) for each of them is determined. It is found that when Mw of PCL decreases, its degree of crystallinity, its glass transition, and its melting temperatures, corresponding to the PCL phase, increase. However, the elongation at break of the blend declines with the reduction in Mw. The tests show that the alteration in the blend's Mw influences its SME. Indeed, Rr of the (PCL/SBS) mixture drops with the decrease in Mw of PCL.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Nastassia Pouradier Duteil; Francesco Salvarani
Kinetic approach to the collective dynamics of the rock paper scissors binary game Article de journal
Dans: Applied Mathematics And Computation, vol. 388, p. 125496, 2021.
@article{pouradier_duteil_1268,
title = {Kinetic approach to the collective dynamics of the rock paper scissors binary game},
author = {Nastassia Pouradier Duteil and Francesco Salvarani},
url = {https://www.sciencedirect.com/science/article/pii/S0096300320304549#!},
year = {2021},
date = {2021-01-01},
journal = {Applied Mathematics And Computation},
volume = {388},
pages = {125496},
abstract = {This article studies the kinetic dynamics of the rock-paper-scissors binary game. We first prove existence and uniqueness of the solution of the kinetic equation and subsequently we prove the rigorous derivation of the quasi-invariant limit for two meaningful choices of the domain of definition of the independent variables. We notice that the domain of definition of the problem plays a crucial role and heavily influences the behavior of the solution. The rigorous proof of the relaxation limit does not need the use of entropy estimates for ensuring compactness.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Kai Zhang; Houssem Badreddine; Naila Hfaiedh; Khemais Saanouni; Jianlin Liu
Failure prediction of magnesium alloys based on improved CDM model Article de journal
Dans: International Journal Of Solids And Structures, vol. 217-218, p. 155-177, 2021.
@article{zhang_1406,
title = {Failure prediction of magnesium alloys based on improved CDM model},
author = {Kai Zhang and Houssem Badreddine and Naila Hfaiedh and Khemais Saanouni and Jianlin Liu},
url = {https://www.sciencedirect.com/science/article/abs/pii/S0020768321000214?via%3Dihub},
year = {2021},
date = {2021-01-01},
journal = {International Journal Of Solids And Structures},
volume = {217-218},
pages = {155-177},
abstract = {The aim of this contribution is to improve the behavior and failure prediction accuracy for magnesium alloy sheet forming simulation by using advanced fully coupled Continuum Damage Mechanics (CDM) model. Starting from known fully coupled constitutive equations at large inelastic (plastic or viscoplastic) strains, three aspects are enhanced on the CDM model developed by Saanouni (2012). The first one concerns the accurate description of tension-compression asymmetry in yielding and hardening of magnesium alloys induced by combined slip and twinning deformations. The second concerns introducing the stress state dependence in damage evolution to improve the fracture prediction under various loading paths. The third deals with temperature and strain rate (viscosity) effects for metal forming processes at elevated temperatures. The improved fully coupled constitutive equations were implemented into finite element code ABAQUS/Explicit via user subroutine VUMAT including the specific local integration scheme to compute the state variables at each quadrature point. Various kinds of tensile tests at different temperatures and strain rates are used to determine the material parameters, and the complete identification procedure is given in details. As validation, the improved model is applied to simulate the three-point bending and circular cup deep drawing tests, the predicted results show good agreements with the experimental observations.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Achraf Ouaddi; Olivier Hubert; Jader Furtado; Song He
Passive piezomagnetic monitoring of structures subjected to in-service cyclic loading: Application to the detection of fatigue crack initiation and propagation Article de journal
Dans: Aip Advances, vol. 11, no. 1, p. 015344, 2021.
@article{ouaddi_1582,
title = {Passive piezomagnetic monitoring of structures subjected to in-service cyclic loading: Application to the detection of fatigue crack initiation and propagation},
author = {Achraf Ouaddi and Olivier Hubert and Jader Furtado and Song He},
url = {https://doi.org/10.1063/9.0000195},
year = {2021},
date = {2021-01-01},
journal = {Aip Advances},
volume = {11},
number = {1},
pages = {015344},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Driss Yakoubi; Jean Deteix; G. L. Ndetchoua Kouamo
Analysis of a time--discrete scheme for the Navier-Stokes/Allen-Cahn model Article de journal
Dans: Journal Of Mathematical Analysis And Applications, vol. 496, no. 2, p. 1-26, 2021.
@article{yakoubi_1678,
title = {Analysis of a time--discrete scheme for the Navier-Stokes/Allen-Cahn model},
author = {Driss Yakoubi and Jean Deteix and G. L. Ndetchoua Kouamo},
url = {https://www.sciencedirect.com/science/article/pii/S0022247X20309793?via%3Dihub},
year = {2021},
date = {2021-01-01},
journal = {Journal Of Mathematical Analysis And Applications},
volume = {496},
number = {2},
pages = {1-26},
abstract = {This paper address the existence and uniqueness, in suitable functional spaces, of the solution of a non linear system of equations originating from the implicit time discretization of the coupled unsteady Navier-Stokes and Allen-Cahn equations. This result is based on the convergence analysis of an original stabilized fixed point algorithm, from which we also get a maximum principle. Numerical experiments are performed to illustrate the influence of the implicit formulation in comparison to a simpler approach based on a semi-explicit time scheme.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Benjamin Bobbia; Clément Dombry; Davit Varron
The coupling method in extreme value theory Article de journal
Dans: Bernoulli, vol. 27, no. 3, p. 31, 2021.
@article{bobbia_1682,
title = {The coupling method in extreme value theory},
author = {Benjamin Bobbia and Clément Dombry and Davit Varron},
url = {https://arxiv.org/pdf/1912.03155.pdf},
year = {2021},
date = {2021-01-01},
journal = {Bernoulli},
volume = {27},
number = {3},
pages = {31},
abstract = {A coupling method is developed for univariate extreme value theory, providing an alternative to the use of the tail empirical/quantile processes. We emphasize the Peak-over-Threshold approach that approximates the distribution above high threshold by the Generalized Pareto Distribution (GPD) and compare the empirical distribution of exceedances to the empirical distribution associated with the limit GPD model. Sharp bounds for their Wasserstein distance in the second order Wasserstein space are provided. As an application, we recover standard results on the asymptotic behavior of the Hill estimator, the Weissman extreme quantile estimator or the probability weighted moment estimators, shedding some new light on the theory.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Benjamin Bobbia; Clément Dombry; Davit Varron
Extreme quantile regression in proportional tail framework Article de journal
Dans: Georgian Mathematical Journal, vol. 175, no. 1, p. 27, 2021.
@article{bobbia_1684,
title = {Extreme quantile regression in proportional tail framework},
author = {Benjamin Bobbia and Clément Dombry and Davit Varron},
url = {https://arxiv.org/pdf/2002.01740.pdf},
year = {2021},
date = {2021-01-01},
journal = {Georgian Mathematical Journal},
volume = {175},
number = {1},
pages = {27},
abstract = {We revisit the model of heteroscedastic extremes initially introduced by Einmahl et al. (JRSSB, 2016) to describe the evolution of a non stationary sequence whose extremes evolve over time and adapt it into a general extreme quantile regression framework. We provide estimates for the extreme value index and the integrated skedasis function and prove their asymptotic normality. Our results are quite similar to those developed for heteroscedastic extremes but with a different proof approach emphasizing coupling arguments. We also propose a pointwise estimator of the skedasis function and a Weissman estimator of the conditional extreme quantile and prove the asymptotic normality of both estimators.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Gregorio Vlad; Xin Wang; Francesco Vannini; Sergio Briguglio; Nakia Carlevaro; Matteo Valerio Falessi; Giuliana Fogaccia; Valeria Fusco; Fulvio Zonca; Alessandro Biancalani; Alberto Bottino; Thomas Hayward-Schneider; Philipp Walter Lauber
A linear benchmark between HYMAGYC, MEGA and ORB5 codes using the NLED-AUG test case to study Alfvénic modes driven by energetic particles Article de journal
Dans: Nuclear Fusion, vol. 61, no. 1, p. 116026, 2021.
@article{vlad_1713,
title = {A linear benchmark between HYMAGYC, MEGA and ORB5 codes using the NLED-AUG test case to study Alfvénic modes driven by energetic particles},
author = {Gregorio Vlad and Xin Wang and Francesco Vannini and Sergio Briguglio and Nakia Carlevaro and Matteo Valerio Falessi and Giuliana Fogaccia and Valeria Fusco and Fulvio Zonca and Alessandro Biancalani and Alberto Bottino and Thomas Hayward-Schneider and Philipp Walter Lauber},
url = {https://doi.org/10.1088/1741-4326/ac2522},
year = {2021},
date = {2021-01-01},
journal = {Nuclear Fusion},
volume = {61},
number = {1},
pages = {116026},
abstract = {One of the major challenges in magnetic confinement thermonuclear fusion research concerns
the confinement of the energetic particles (EPs) produced by fusion reactions and/or by
additional heating systems. In such experiments, EPs can resonantly interact with the shear
Alfvén waves. In the frame of the EUROfusion 2019-2020 Enabling Research project
?multi-scale energetic particle transport in fusion devices' (MET), a detailed benchmark
activity has been undertaken among few of the state-of-the-art codes available to study the
self-consistent interaction of an EP population with the shear Alfvén waves. In this paper
linear studies of EP driven modes with toroidal mode number n = 1 will be presented, in real
magnetic equilibria and in regimes of interest for the forthcoming generation devices (e.g.
ITER, JT-60SA, DTT). The codes considered are HYMAGYC, MEGA, and ORB5, the first
two being hybrid MHD-gyrokinetic codes (bulk plasma is represented by MHD equations,
while the EP species is treated using the gyrokinetic formalism), the third being a global
electromagnetic gyrokinetic code. The so-called NLED-AUG reference case has been
considered, both for the peaked on-axis and peaked off-axis EP density profile cases, using its
shaped cross section version. Comparison of the spatial mode structure, growth rate and real
frequency of the modes observed will be considered in detail. The dependence of mode
characteristics when several parameters are varied, as, e.g. the ratio between EP and bulk ion
density and EP temperature, will be presented. A remarkable agreement is observed among the
three codes for the peaked off-axis case, obtaining all of them a TAE localized close to the
magnetic axis. On the other hand, some differences are observed when considering the peaked
on-axis case, where two modes are observed (a TAE localized in the radial external region, and
an RSAE around mid-radius). A careful analysis of the stability of this equilibrium, in
particular by varying self-consistently the EP drive, will allow to reconcile the results of the
three codes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Giulia Braghini; Francesco Salvarani
EFFECTS OF HIDDEN OPINION MANIPULATION IN MICROBLOGGING PLATFORMS Article de journal
Dans: Advances In Complex Systems, vol. 24, no. 5, p. 2150009 (26 pages), 2021.
@article{braghini_1820,
title = {EFFECTS OF HIDDEN OPINION MANIPULATION IN MICROBLOGGING PLATFORMS},
author = {Giulia Braghini and Francesco Salvarani},
url = {https://www.worldscientific.com/doi/abs/10.1142/S0219525921500090},
year = {2021},
date = {2021-01-01},
journal = {Advances In Complex Systems},
volume = {24},
number = {5},
pages = {2150009 (26 pages)},
abstract = {This paper studies a model for describing opinions' evolution in a community linked by microblogging directed network systems. The network can evolve in time by means of the creation and the deletion of some connections. When a connexion is created, the individuals have access to the whole history of posts written by the corresponding author and, when a connexion is destroyed, all the posts written by the corresponding author become invisible. The agents' opinions are described by a set of continuous opinion variables in the closed interval Omega=[-1,1]. They represent the agreement (or disagreement) of the corresponding agent with respect to a binary question (such as a referendum or an election with two candidates). The model takes into account the effects on public opinion caused by the sign and the intensity of the initial opinions of the agents, their activity in microblogging platforms the presence of leaders and the possible manipulations of the visibility of the posts by the microblogging platform owner. The model is written as a system of integro-differential equations and simulated by using a Runge-Kutta method. We show that hidden manipulation can have an important impact on the public opinion formation and that very mild interventions of the network owner may induce major effects on the population. In our simulations, the effect of hidden manipulation is shown to be more efficient in driving the public opinion than the action of a leader, in the case of bounded confidence models and for short-time intervals.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Francesco Salvarani
Recent Advances in Kinetic Equations and Applications Ouvrage
Springer, 2021, ISBN: 978-3-030-82946-9.
@book{salvarani_1821,
title = {Recent Advances in Kinetic Equations and Applications},
author = {Francesco Salvarani},
url = {https://link.springer.com/book/10.1007/978-3-030-82946-9},
issn = {978-3-030-82946-9},
year = {2021},
date = {2021-01-01},
volume = {48},
pages = {XI, 393},
publisher = {Springer},
series = {Springer INdAM Series},
abstract = {The volume covers most of the topics addressed and discussed during the Workshop INdAM "Recent advances in kinetic equations and applications", which took place in Rome (Italy), from November 11th to November 15th, 2019.
The volume contains results on kinetic equations for reactive and non-reactive mixtures and on collisional and non-collisional Vlasov equations for plasmas.
Some contributions are devoted to the study of phase transition phenomena, of kinetic problems with non-trivial boundary conditions and hierarchies of models.
The book, addressed to researchers interested in the mathematical and numerical study of kinetic equations, provides an overview of recent advances in the field and future research directions.},
keywords = {},
pubstate = {published},
tppubtype = {book}
}
Benjamin Bobbia
Donsker's Theorem for local data-driven empirical measures Conférence
Forum Jeunes Mathématiciens, Besançon, france, 2021.
@conference{bobbia_1772,
title = {Donsker's Theorem for local data-driven empirical measures},
author = {Benjamin Bobbia},
year = {2021},
date = {2021-11-01},
booktitle = {Forum Jeunes Mathématiciens},
address = {Besançon, france},
abstract = {Nowadays, empirical processes are well known object. A reason that push forward theirs studies is that, in many modelisations, we can write the estimators as images of empirical measures. In this work we investigate the case of local empirical measures, that is the empirical measure built over a subsample with data conditionned to be in a certain area. There exist numerous results about such result, but what can we say if the previous area is data driven ? We can handle this situation with high technical cost and additional assumptions. The main aim of the present work is to present a general framework which allows to derive asymptotic results for this particular empirical measures with lower cost (in terms of technicality and assumptions). We give a Donsker-type theorem for such measures and present some domains of application as extreme values theory or multivariate regular variations},
keywords = {},
pubstate = {accepted},
tppubtype = {conference}
}
Ayech Benjeddou; Mohamed Guerich
5th Tunisian Congress of Mechanics CoTuMe'2020, Hammaet, Tunisia, 2021.
@conference{benjeddou_1355,
title = {On three-dimensional detailed finite element free-vibration analysis of hexagonal honeycomb sandwich panels},
author = {Ayech Benjeddou and Mohamed Guerich},
url = {http://www.cotume.com/en/},
year = {2021},
date = {2021-03-01},
booktitle = {5th Tunisian Congress of Mechanics CoTuMe'2020},
address = {Hammaet, Tunisia},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Guillaume Guérard; Loup-Noé Levy; Sofiane Ben Amor; Hai Tran; Jérémie Bosom
Modeling and recommendation system for improving the energy performance of buildings Inproceedings
Dans: Inoue, Masataka (Ed.): International Conference on Distributed Computing and Artificial Intelligence, MDPI, virtual, 2021.
@inproceedings{guerard_1603,
title = {Modeling and recommendation system for improving the energy performance of buildings},
author = {Guillaume Guérard and Loup-Noé Levy and Sofiane Ben Amor and Hai Tran and Jérémie Bosom},
editor = {Masataka Inoue},
url = {https://www.dcai-conference.net/programme},
year = {2021},
date = {2021-10-01},
booktitle = {International Conference on Distributed Computing and Artificial Intelligence},
publisher = {MDPI},
address = {virtual},
abstract = {The energy performance of building represents a major issue of the 21st century.
However, buildings are complex sociotechnical systems because of the massification, heterogeneity and multiplicity of related data.
Therefore, evaluating their performance and giving relevant recommendation is a challenging task.
In this article, we propose a contributory algorithmic recommendation system applicable to energy performance diagnostic and prediction.
Doing so requires to overcome many theoretical and technical issues related to big data infrastructure, machine learning factory, and DevOps.
The thesis is done through Energisme's platform.
It presents a collection and deployment of algorithmic solutions for optimized energy management in private and public organizations.},
keywords = {},
pubstate = {accepted},
tppubtype = {inproceedings}
}
Nada Chami; Pascal Clain; Véronique Osswald; Anthony Delahaye; Laurence Fournaison; Didier Dalmazzone
Characterization of mixed CP + CO2 hydrates for refrigeration applications Inproceedings
Dans: 13th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning, Vicenza, Italy, 2021.
@inproceedings{chami_1565,
title = {Characterization of mixed CP + CO2 hydrates for refrigeration applications},
author = {Nada Chami and Pascal Clain and Véronique Osswald and Anthony Delahaye and Laurence Fournaison and Didier Dalmazzone},
url = {http://static.gest.unipd.it/PCM2021/},
year = {2021},
date = {2021-09-01},
booktitle = {13th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning},
address = {Vicenza, Italy},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Somia Haouache; Pascal Clain; Isabelle Capron; Laurence Fournaison
Dans: 13th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning, Vicenza, Italy, 2021.
@inproceedings{haouache_1566,
title = {The influence of droplet size and hexadecane volume fraction on the rheological behavior of hexadecane-in-water emulsion stabilized by cellulose nanocrystals},
author = {Somia Haouache and Pascal Clain and Isabelle Capron and Laurence Fournaison},
url = {http://static.gest.unipd.it/PCM2021/},
year = {2021},
date = {2021-09-01},
booktitle = {13th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning},
address = {Vicenza, Italy},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Véronique Osswald; Pascal Clain; Didier Dalmazzone; Anthony Delahaye; Laurence Fournaison
Kinetic study ofCO2 hydrate formation based on heat transfer measurement Inproceedings
Dans: 13th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning, Vicenza, Italy, 2021.
@inproceedings{osswald_1567,
title = {Kinetic study ofCO2 hydrate formation based on heat transfer measurement},
author = {Véronique Osswald and Pascal Clain and Didier Dalmazzone and Anthony Delahaye and Laurence Fournaison},
url = {http://static.gest.unipd.it/PCM2021/},
year = {2021},
date = {2021-09-01},
booktitle = {13th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning},
address = {Vicenza, Italy},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Guillaume Guérard; Sonia Djebali
Tourists Profiling by Interest Analysis Inproceedings
Dans: International Conference on Advanced Data Mining and Applications, Virtual, 2021.
@inproceedings{guerard_1662,
title = {Tourists Profiling by Interest Analysis},
author = {Guillaume Guérard and Sonia Djebali},
url = {Not yet},
year = {2021},
date = {2021-09-01},
booktitle = {International Conference on Advanced Data Mining and Applications},
address = {Virtual},
abstract = {With the recent digital revolution, analyzing of tourists' behaviors
and research elds associated with it have changed profoundly.
It is now easier to examine behaviors of tourists using digital traces they
leave during their travels. The studies conducted on diverse aspects of
tourism focus on quantitative aspects of digital traces to reach its conclusions.
In this paper, we suggest a study focused on both qualitative and
quantitative aspect of digital traces to understand the dynamics governing
tourist behavior, especially those concerning attractions networks.},
keywords = {},
pubstate = {accepted},
tppubtype = {inproceedings}
}
Thuy Nguyen; Daniel Bonamy
Lattice trapping and fracture toughness selection in britttle crystals Inproceedings
Dans: 25th International Congress of Theoretical and Applied Mechanics, Milano, Italy, 2021.
@inproceedings{nguyen_1272,
title = {Lattice trapping and fracture toughness selection in britttle crystals},
author = {Thuy Nguyen and Daniel Bonamy},
url = {https://www.ictam2020.org/},
year = {2021},
date = {2021-08-01},
booktitle = {25th International Congress of Theoretical and Applied Mechanics},
address = {Milano, Italy},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Antoine Montiel; Thuy Nguyen; M Perchelet; Valérie Geertsen; Cindy Roundtree; Patrick Guenoun; Daniel Bonamy
Mechanical and fracture behaviour of microlattice-based metamaterial with disordered architecture Inproceedings
Dans: 25th International Congress of Theoretical and Applied Mechanics, Milan, Italy, 2021.
@inproceedings{montiel_1498,
title = {Mechanical and fracture behaviour of microlattice-based metamaterial with disordered architecture},
author = {Antoine Montiel and Thuy Nguyen and M Perchelet and Valérie Geertsen and Cindy Roundtree and Patrick Guenoun and Daniel Bonamy},
url = {https://www.ictam2020.org/},
year = {2021},
date = {2021-08-01},
booktitle = {25th International Congress of Theoretical and Applied Mechanics},
address = {Milan, Italy},
abstract = {Microlattice based metamaterials made of periodically arranged hollow microtubes appear as highly promising materials; they
both combine ultra-low density and sufficient stiffness and mechanical strength to envisage their use as structure material, in the aeronautical
industry for instance. Still, until now, most studies have considered periodically ordered architectures. Here, we explored amorphous
architectures and analysed how the disorder amount plays on the mechanical and failure properties. The presented study relies on both
numerical simulations using Timoshenko beam model and experiments performed on 3D-printed samples, the architecture of which mimics
that of the simulated samples},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Guillaume Guérard; Sonia Djebali
Hidden Markov Model to Predict Tourists Visited Places Inproceedings
Dans: Nick Koudas Vana Kalogeraki, Jianliang Xu (Ed.): 22nd IEEE International Conference on Mobile Data Management, p. 209-216, IEEE, virtual, 2021, ISBN: 978-1-6654-2845-3.
@inproceedings{guerard_1601,
title = {Hidden Markov Model to Predict Tourists Visited Places},
author = {Guillaume Guérard and Sonia Djebali},
editor = {Vana Kalogeraki, Nick Koudas, Jianliang Xu},
url = {https://ieeexplore.ieee.org/abstract/document/9474900},
issn = {978-1-6654-2845-3},
year = {2021},
date = {2021-06-01},
booktitle = {22nd IEEE International Conference on Mobile Data Management},
pages = {209-216},
publisher = {IEEE},
address = {virtual},
abstract = {Nowadays, social networks is become a popular means of analyzing tourist behavior, thanks to the digital traces left by travelers during their stays on these networks.
The massive amount of data generated by the propensity of tourists to share comments and photos during their trip makes it possible to model their journeys and analyze their behavior.
Predicting the next movement of tourist plays a key role in tourism marketing to understand demand and improve decision support.
In this paper, we propose a method to understand and to learn tourists' movements based on social network data analysis to predict the future movements. The method relies on a machine learning grammatical inference algorithm.
A major contribution in this paper is to adapt the grammatical inference algorithm to the context of big data.
Our method produces a hidden Markov model representing the movements of a group of tourists. The hidden Markov model is flexible and editable with new data.
The capital city of France, Paris is selected to demonstrate the efficiency of the proposed methodology.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Sonia Djebali; Guillaume Guérard
BIDDING STRATEGY OF A SEASONAL STORAGE HYDROPOWER PLANT IN RESERVE MARKETS Inproceedings
Dans: International Association for Energy Economics, virtual, 2021.
@inproceedings{djebali_1602,
title = {BIDDING STRATEGY OF A SEASONAL STORAGE HYDROPOWER PLANT IN RESERVE MARKETS},
author = {Sonia Djebali and Guillaume Guérard},
url = {http://devel.iaee.org/proceedings/article/17208},
year = {2021},
date = {2021-06-01},
booktitle = {International Association for Energy Economics},
address = {virtual},
abstract = {The increasing share of intermittent sources of energy will increase the need for frequency-control reserves. However, the current supply of reserves might decrease in the following years. The share of gas- and coal-fuel plants in the power mix is expected to decline in order to reduce greenhouse gas emissions. Hydropower technologies are often put forward as mature and low-carbon technologies able to contribute to cover this increasing need for reserves. Their flexibility and storage capability allow them to support the stable operation of the grid. The procurement of reserves being mostly market-based in Europe, the market design should send the correct price signals to encourage the participation in these markets.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Guillaume Guérard; Sonia Djebali
Tourism Management through the Big Data Paradigm Inproceedings
Dans: David Chavalarias, Hocine Cherifi (Ed.): French Regional Conference on Complex Systems FRCCS, Springer - Applied Network Science Journal, virtual, 2021.
@inproceedings{guerard_1600,
title = {Tourism Management through the Big Data Paradigm},
author = {Guillaume Guérard and Sonia Djebali},
editor = {David Chavalarias, Hocine Cherifi},
url = {https://easychair.org/smart-program/FRCCS2021},
year = {2021},
date = {2021-05-01},
booktitle = {French Regional Conference on Complex Systems FRCCS},
publisher = {Springer - Applied Network Science Journal},
address = {virtual},
abstract = {This paper highlights the two-ways relationship between data and entities producing or generating these data in the context of tourism management. Indeed, tourists leave various traces of their planning and trip on social media and networks. Moreover, studying those data to feed tourism marketing also affects the future data left by tourists. Understanding the intrinsic and extrinsic relationship between entities should significantly improve the knowledge in this research field.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Loup-Noé Levy; Jérémie Bosom; Guillaume Guérard; Sofiane Ben Amor; Marc Bui
Application of Pretopological Hierarchical Clustering for Buildings Portfolio Inproceedings
Dans: Cornel Klein, Matthias Jarke; Helfert, Markus (Ed.): Proceedings of the 10th International Conference on Smart Cities and Green ICT Systems - SMARTGREENS, p. 228-235, SciTePress, virtual, 2021, ISBN: 978-989-758-512-8.
@inproceedings{levy_1501,
title = {Application of Pretopological Hierarchical Clustering for Buildings Portfolio},
author = {Loup-Noé Levy and Jérémie Bosom and Guillaume Guérard and Sofiane Ben Amor and Marc Bui},
editor = {Cornel Klein, Matthias Jarke and Markus Helfert},
url = {https://www.scitepress.org/Link.aspx?doi=10.5220/0010485802280235},
issn = {978-989-758-512-8},
year = {2021},
date = {2021-04-01},
booktitle = {Proceedings of the 10th International Conference on Smart Cities and Green ICT Systems - SMARTGREENS},
pages = {228-235},
publisher = {SciTePress},
address = {virtual},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Driss Yakoubi; Sarra Maarouf
Analysis of backward Euler/spectral discretization for an evolutionary mass and heat transfer in porous medium Article de journal
Dans: Journal Of Mathematical Analysis And Applications, vol. 492, no. 1, p. 1-24, 2020.
@article{yakoubi_1679,
title = {Analysis of backward Euler/spectral discretization for an evolutionary mass and heat transfer in porous medium},
author = {Driss Yakoubi and Sarra Maarouf},
url = {https://www-sciencedirect-com.acces.bibl.ulaval.ca/science/article/pii/S0022247X20305898?via%3Dihub},
year = {2020},
date = {2020-12-01},
journal = {Journal Of Mathematical Analysis And Applications},
volume = {492},
number = {1},
pages = {1-24},
abstract = {This paper presents the unsteady Darcy's equations coupled with two nonlinear reaction-diffusion equations, namely this system describes the mass concentration and heat transfer in porous media. The existence and uniqueness of the solution are established for both the variational formulation problem and for its discrete one obtained using spectral discretization. Optimal a priori estimates are given using the Brezzi-Rappaz-Raviart theorem. We conclude by some numerical tests which are in agreement with our theoretical results.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Etienne Bernard; Francesco Salvarani
Optimal Estimate of the Spectral Gap for the Degenerate Goldstein-Taylor Model Article de journal
Dans: Journal Of Statistical Physics, vol. 181, p. 1470-1471, 2020.
@article{bernard_1413,
title = {Optimal Estimate of the Spectral Gap for the Degenerate Goldstein-Taylor Model},
author = {Etienne Bernard and Francesco Salvarani},
url = {https://link.springer.com/article/10.1007/s10955-020-02631-y},
year = {2020},
date = {2020-11-01},
journal = {Journal Of Statistical Physics},
volume = {181},
pages = {1470-1471},
abstract = {x},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Fatima Benmesbah; Livio Ruffine; Pascal Clain; Véronique Osswald; Olivia Fandino; Laurence Fournaison; Anthony Delahaye
Methane Hydrate Formation and Dissociation in Sand Media: Effect of Water Saturation, Gas Flowrate and Particle Size Article de journal
Dans: Energies, vol. 13, no. 19, p. 5200, 2020.
@article{benmesbah_1563,
title = {Methane Hydrate Formation and Dissociation in Sand Media: Effect of Water Saturation, Gas Flowrate and Particle Size},
author = {Fatima Benmesbah and Livio Ruffine and Pascal Clain and Véronique Osswald and Olivia Fandino and Laurence Fournaison and Anthony Delahaye},
url = {https://www.mdpi.com/1996-1073/13/19/5200},
year = {2020},
date = {2020-10-01},
journal = {Energies},
volume = {13},
number = {19},
pages = {5200},
abstract = {Assessing the influence of key parameters governing the formation of hydrates and determining the capacity of the latter to store gaseous molecules is needed to improve our understanding of the role of natural gas hydrates in the oceanic methane cycle. Such knowledge will also support the development of new industrial processes and technologies such as those related to thermal energy storage. In this study, high-pressure laboratory methane hydrate formation and dissociation experiments were carried out in a sandy matrix at a temperature around 276.65 K. Methane was continuously injected at constant flowrate to allow hydrate formation over the course of the injection step. The influence of water saturation, methane injection flowrate and particle size on hydrate formation kinetics and methane storage capacity were investigated. Six water saturations (10.8%, 21.6%, 33%, 43.9%, 55% and 66.3%), three gas flowrates (29, 58 and 78 mLn min?1) and three classes of particle size (80-140, 315-450 and 80-450 µm) were tested, and the resulting data were tabulated. Overall, the measured induction time obtained at 53-57% water saturation has an average value of 58 ± 14 min minutes with clear discrepancies that express the stochastic nature of hydrate nucleation, and/or results from the heterogeneity in the porosity and permeability fields of the sandy core due to heterogeneous particles. Besides, the results emphasize a clear link between the gas injection flowrate and the induction time whatever the particle size and water saturation. An increase in the gas flowrate from 29 to 78 mLn min-1 is accompanied by a decrease in the induction time up to 100 min (i.e., 77% decrease). However, such clear behaviour is less conspicuous when varying either the particle size or the water saturation. Likewise, the volume of hydrate-bound methane increases with increasing water saturation. This study showed that water is not totally converted into hydrates and most of the calculated conversion ratios are around 74-84%, with the lowest value of 49.5% conversion at 54% of water saturation and the highest values of 97.8% for the lowest water saturation (10.8%). Comparison with similar experiments in the literature is also carried out herein.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Kai Zhang; Houssem Badreddine; Naila Hfaiedh; Khemais Saanouni; Jianlin Liu
Enhanced CDM model accounting of stress triaxiality and Lode angle for ductile damage prediction in metal forming Article de journal
Dans: International Journal Of Damage Mechanics, vol. 30, no. 2, p. 260-282, 2020.
@article{zhang_1270,
title = {Enhanced CDM model accounting of stress triaxiality and Lode angle for ductile damage prediction in metal forming},
author = {Kai Zhang and Houssem Badreddine and Naila Hfaiedh and Khemais Saanouni and Jianlin Liu},
url = {https://journals.sagepub.com/doi/full/10.1177/1056789520958045},
year = {2020},
date = {2020-09-01},
journal = {International Journal Of Damage Mechanics},
volume = {30},
number = {2},
pages = {260-282},
abstract = {This paper deals with the prediction of ductile damage based on CDM approach fully coupled with advanced elastoplastic constitutive equations. This fully coupled damage model is developed based on the total energy equivalence assumption under the thermodynamics of irreversible processes framework with state variables. In this model, the damage evolution is enhanced by accounting for both stress triaxiality and Lode angle. The proposed constitutive equations are implemented into Finite Element (FE) code ABAQUS/Explicit through a user material subroutine (VUMAT). The material parameters are determined by the hybrid experimental-numerical method using various tensile and shear tests. Validation of the proposed model has been done using different tests of two aluminum alloys (Al6061-T6 and Al6014-T4). Through comparisons of numerical simulations with experimental results for different loading paths, the predictive capabilities of the proposed model have been shown. The model is found to be able to capture the initiation as well as propagation of macro-crack in sheet and bulk metals during their forming processes},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Djamila Hamroun; Kamel Hamdache
Existence of large solutions to the Landau-Lifshitz-Bloch equation Article de journal
Dans: Communications In Mathematical Sciences, vol. 18, no. 2, p. 487-513, 2020.
@article{hamroun_1169,
title = {Existence of large solutions to the Landau-Lifshitz-Bloch equation},
author = {Djamila Hamroun and Kamel Hamdache},
url = {https://www.intlpress.com/site/pub/pages/journals/items/cms/_home/acceptedpapers/index.php},
year = {2020},
date = {2020-05-14},
journal = {Communications In Mathematical Sciences},
volume = {18},
number = {2},
pages = {487-513},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
N'hésitez pas à contacter le service des admissions pour tout renseignement complémentaire :
