HAL Portal Univ Catholille
Not a member yet
19763 research outputs found
Sort by
Dynamic Pricing in Bilateral Relationships: Experimental Evidence
No full textThis paper presents experimental evidence on dynamic pricing in a large number of finite-horizon bilateral relationships, building on Hart and Tirole (1988). We examine four distinct treatments that vary the mode of trade and the seller's commitment ability. We find that theory accurately predicts average prices across relationships but falls short of capturing the diversity of individual price trajectories. We also find that commitment has less bite than theory predicts, with sellers leaving significant rents to buyers and frequently committing to changing or oscillating prices. Our analysis suggests that theory explains behavior under renting better than under selling
How do Monetary Incentives Affect the Measurement of Social Preferences?
No full textInternational audienceIn this registered report, we investigate (i) whether incentives affect subjects' willingness to pay to increase, and to decrease the payoff of others, (ii) whether they affect the distribution of social preference types, and (iii) whether they affect the strength and the precision of individuals' structurally estimated social preference parameters. Using an online experiment with a general population sample, we show that the use of monetary incentives, as well as the size of the stakes, have little impact on subjects' modal choices (descriptive analysis), as well as for the distribution of qualitatively distinct preference types in the population (clustering analysis). However, monetary incentives affect quantitative measures of the strength and the precision of social preferences. Indeed, a structural analysis reveals that the preference elicitation with merely hypothetical stakes leads to an overestimation and a less precise measurement of social preferences. Together, these results highlight that incentivizing the elicitation of social preferences is most useful when interested in quantitative estimates.For researchers interested in identifying merely qualitative preferences types, however, hypothetical stakes might suffice
Development and validation of a 2D Mason model for ultrasonic transducer arrays: A simplified approach simulating crosstalk and dissipation mechanisms
No full textInternational audiencePiezoelectric elements arranged in 1D or 2D configurations are commonly used in ultrasonic transducer arrays for medical imaging and non-destructive testing (NDT) applications. These arrays are usually modeled using complex 2D or 3D numerical methods. Based on the equivalent circuit approach previously developed in our paper One-dimensional equivalent circuit for ultrasonic transducer arrays” (Bybi. et al. Applied Acoustics 2019) [1], this work proposes a novel and accurate two-dimensional equivalent circuit to model and simulate the electromechanical behavior of piezoelectric transducer arrays. The model consists of a lossy 2D Mason circuit taking into account the width and thickness modes and also the modes coupling, the crosstalk phenomenon, and various dissipation mechanisms, including dielectric, piezoelectric, and mechanical losses. The model is tested on a fabricated seven elements transducer array made of PZ27 and its results (electrical impedance, displacement, and crosstalk curves) are validated by comparison with experimental data. A good agreement is obtained between simulation results and measurements, confirming the validity of the model. Key advantages of the proposed model include its simplicity, ease of implementation, and a significant reduction in computation time compared to traditional numerical methods. Furthermore, this approach allows for the analysis of the crosstalk between array elements without the need for expensive experiments, such as laser vibrometer displacement measurements. Finally, the model will be extended to a 64-element piezoelectric array, with individual matching layers, backing, and its associated electronics, to deepen the study of the crosstalk phenomenon and propose solutions to reduce it
Mo-enhanced passivity of stainless steels studied at metal/oxide interfaces by DFT atomistic modeling
No full textInternational audienc
Table ronde : Catégorisations juridiques et organisation judiciaire : le modèle français
No full textInternational audienc
Défaut de notification de changement de domicile et non-représentation d'enfant aggravée (commentaire de l'arrêt Cass. crim. 19 novembre 2025, n° 25-81.397)
No full textInternational audienceLe code pénal offre une protection à l'autorité parentale dans les relations entre parents, essentiellement lorsque laséparation entraîne de la part de l'un d'eux des comportements attentatoires aux droits de l'autre. Si, du point de vue de latitularité des droits, c'est le parent qui est victime de l'infraction, le comportement incriminé porte également préjudice àl'enfant qui se voit séparé d'un de ses parents. Les incriminations de défaut de notification d'un changement de domicile(C. pén., art. 227-6 ) et de non-représentation d'enfant (C. pén., art. 227-9 ) sanctionnent spécifiquement le fait parun parent de ne pas respecter le droit de l'autre de vivre ou d'entretenir des relations avec l'enfant. L'arrêt de la chambrecriminelle de la Cour de cassation du 19 novembre 2025 revient opportunément sur la caractérisation de ces deuxinfractions, qui tendent à préserver les droits parentaux et à protéger le droit de l'enfant de maintenir des relations avecses deux parents (CIDE, art. 9 ; C. civ., art. 373-2 , al. 2)
Dynamics of the harmonic acoustic pneumatic source for active control of time-varying tonal noise
No full textInternational audienceThe Harmonic Acoustic Pneumatic Source (HAPS), a mechanical airflow modulator, is a promising alternative to loudspeakers as secondary sources for the active control of harmonic noise, thanks to its ability to generate high sound pressure levels and to precisely control signal frequency, phase, and amplitude. However, this source requires a specialized control strategy, as it operates through mechanical modulation at a predetermined frequency. Hence, conventional adaptive control techniques are not directly applicable. Furthermore, when dealing with time-varying harmonic noise, the dynamic performance of the control system, which is influenced by the dynamic properties of the HAPS, is challenged. The originality of this study lies in considering this source, not as a tonal source, but as a narrow-band mechanical modulator that generates a narrow-band anti-noise by driving its complex envelope, allowing the active control of time-varying primary noise. A model of the dynamic response of the Harmonic Acoustic Pneumatic Source and of its controller is presented, with an analysis of the theoretical dynamic performances and limitations of this control system. The controller uses either a far-field error microphone or a near-field error microphone with a previously established compensation strategy. The closed-loop model is validated with experimental results. Simulations and experiments of far-field and near-field active noise control on slow time-varying primary noise are conducted to characterize the dynamic performances and limitations of the controller. The simulations are in good agreement with the experimental results
« Whitehead, la pensée du procès et la dépendance de Dieu au monde »
No full textInternational audienc
Décoloniser notre rapport aux animaux: Comment repenser notre relation aux êtres vivants
No full textInternational audienceEt si la véritable question n’était pas : « Faut-il (ou non) manger des animaux ? » mais : « Pourquoi les exploitons-nous ? »Depuis des siècles, la pensée occidentale a hissé l’humain au sommet : maître de la Nature et du vivant, des territoires et des destins animaux. Cette colonisation du vivant a façonné nos lois, nos fermes, nos laboratoires, nos récits, jusqu’à nos gestes les plus ordinaires.Pourtant, d’autres peuples voient le monde autrement. Ils savent que la Terre n’appartient à personne, que l’animal n’est pas seulement une ressource, mais d’abord une présence, une relation, une existence sensible et que nous devons composer avec lui parce que nous vivons avec lui.Dans cet essai, Cédric Sueur explore les racines de cette domination et propose une révolution du regard : décoloniser notre rapport au vivant. Décoloniser les animaux, c’est apprendre à les voir autrement : non plus comme des objets d’usage, mais comme des partenaires de monde. C’est reconnaître la conscience, la mémoire, la joie et la souffrance de celles et ceux avec qui nous partageons la Terre.Un essai engagé et lumineux qui invite à réparer nos imaginaires et à refonder nos pratiques, pour rappeler cette évidence simple : Nous faisons monde ensemble, avec les animaux et avec les autres êtres vivants.Cédric Sueur est professeur en éthologie et en primatologie à l’université de Strasbourg, membre de l’Institut universitaire de France, spécialiste de la socialité chez les animaux et les humains. Il a publié Les Péripéties d’un primatologue
Comment favoriser l’engagement des usagers dans le développement et l’appropriation des préconisations en faveur de l’environnement ? Quelques apports de la psychologie sociale
No full textAudition du 13/01/26 par le groupe de travail « PCAET (plan climat-air-énergie territorial) : Initiatives et appropriation citoyenne » du Conseil de Développement de la Métropole Européenne de Lille. Lille, France.Audition du 13/01/26 par le groupe de travail « PCAET (plan climat-air-énergie territorial) : Initiatives et appropriation citoyenne » du Conseil de Développement de la Métropole Européenne de Lille. Lille, France