HAL - Université de Franche-Comté
Not a member yet
51444 research outputs found
Sort by
Recension de Nutrition and Nutritive Soul in Aristotle and Aristotelianism (De Gruyter, 2020)
No full textDépouillement analytique bilingue complet de l’ouvrage (français/anglais)Recension de : Giouli Korobili & Roberto Lo Presti (eds), Nutrition and Nutritive Soul in Aristotle and Aristotelianism, De Gruyter, 2020. XXII-418 p
L’universel scolaire connaît quelques complications: Une enquête en lycée professionnel
No full textInternational audienc
Cooperative vs. non-cooperative marketplace for computing jobs to be run on geo-distributed data centers only supplied by renewable energies
No full textInternational audienceAbstract Since the Paris Agreement, there has been increased focus on decreasing greenhouse gas (GHG) emissions related to power supply. Data centers are a huge energy consumer sector due to their continuous operational demand. A way to reduce their impact on GHG is by using renewable energy in their power supply. However, renewable energy introduces production intermittence since it depends on the climate conditions. Geo-distributed data centers can exploit diverse climate conditions to diminish the problem. This work presents a geo-distributed data center marketplace only supplied by renewable energies. In our marketplace model, the data centers are independent and compete for the users’ jobs. The winner data center is defined using a reverse auction process. We compare different aspects, such as centralized/distributed architectures and cooperative/non-cooperative marketplaces. Our results show that the cooperative and distributed data center model earns more money (5.39% more money), wastes less energy (3.81% less energy), and provides higher QoS (improvement of 4.31% for services and 2.71% for tasks)
Urine flow cytometry in older adults urinary tract infection diagnosis: is it time to reevaluate thresholds for men and women?
No full textInternational audienc
Supercontinuum generation in high-index doped silica photonic integrated circuits under diverse pumping settings
No full textInternational audienceRecent advances in supercontinuum light generation have been remarkable, particularly in the context of highly nonlinear photonic integrated waveguides. In this study, we thoroughly investigate supercontinuum (SC) generation in high-index doped silica glass integrated waveguides, exploring various femtosecond pumping wavelengths and input polarization states. We demonstrate broadband SC generation spanning from 700 nm to 2400 nm when pumping within the anomalous dispersion regime at 1200 nm, 1300 nm, and 1550 nm. In contrast, pumping within the normal dispersion regime at 1000 nm results in narrower SC spectra, primarily due to coherent nonlinear effects such as self-phase modulation and optical wave breaking, and also dispersive wave generation in the anomalous dispersion regime. We further examine the impact of both TE and TM polarization modes on SC generation, shedding light on the polarization-dependent characteristics of the broadening process. Additionally, we report the observation of two new Raman peaks at 48.8 THz and 75.1 THz in high-index glass using a confocal Raman micro-spectrometer. Incorporating these two peaks in the Raman gain modeling, we achieved good agreement between numerical simulations based on the modified nonlinear Schrödinger equation and experimental results. Finally, we present relative intensity noise measurements of the supercontinuum generated at 1550 nm using the real-time dispersive Fourier transform technique
Understanding and Predicting Population Response to Anthropogenic Disturbance: Current Approaches and Novel Opportunities
No full textInternational audienceEffective conservation of biodiversity depends on the successful management of wildlife populations and their habitats. Successful management, in turn, depends on our ability to understand and accurately forecast how populations and communities respond to human‐induced changes in their environments. However, quantifying how these stressors impact population dynamics remains challenging. Another significant hurdle at this interface is determining which quantitative approach(es) are most appropriate given data types, constraints and the intended purpose. Here, we provide a cross‐taxa overview of key methodological approaches (e.g., matrix population models) and model elements (e.g., energetics) that are currently used to model the effects of anthropogenic disturbance on wildlife populations. Specifically, we discuss how these modelling approaches differ in their key assumptions, in their structure and complexity, in the questions they are best poised to address and in their data requirements. Our intention is to help overcome some of the methodological biases that might persist across taxonomic specialisations, identify new opportunities to address existing modelling challenges and improve scientific understanding of the direct and indirect impacts of anthropogenic disturbance. We guide users through the identification of appropriate model configurations for different management purposes, while also suggesting key priorities for model development and integration
Spectral optimization of supercontinuum shaping using metaheuristic algorithms, a comparative study
No full textInternational audienceSupercontinuum generation in optical fiber involves complex nonlinear dynamics, making optimization challenging, and typically relying on trial-and-error or extensive numerical simulations. Machine learning and metaheuristic algorithms offer more efficient optimization approaches. We report here an experimental study of supercontinuum spectral shaping by tuning the phase of the input pulses, different optimization approaches including a genetic algorithm, particle swarm optimizer, and simulated annealing. We find that the genetic algorithm and particle swarm optimizer are more robust and perform better, with the particle swarm optimizer converging faster. Our study provides valuable insights for the systematic optimization of supercontinuum and other optical sources
White Light Spectroscopy Characteristics and Expansion Dynamic Behavior of Primary T-Cells: A Possibility of Online, Real-Time, and Sampling-Less CAR T-Cell Production Monitoring
No full textInternational audienceThe production of advanced therapy medicinal products (ATMP) is a long and highly technical process, resulting in a high cost per dose, which reduces the number of eligible patients. There is a critical need for a closed and sample-free monitoring system to perform the numerous quality controls required. Current monitoring methods are not optimal, mainly because they require the system to be opened up for sampling and result in material losses. White light spectroscopy has emerged as a technique for sample-free control compatible with closed systems. We have recently proposed its use to monitor cultures of CEM-C1 cell lines. In this paper, we apply this method to T-cells isolated from healthy donor blood samples. The main differences between cell lines and human primary T-cells lie in the slightly different shape of their absorption spectra and in the dynamics of cell expansion. T-cells do not multiply exponentially, resulting in a non-constant generation time. Cell expansion is described by a power-law model, which allows for the definition of instantaneous generation times. A correlation between the linear asymptotic behavior of these generation times and the initial cell concentration leads to the hypothesis that this could be an early predictive marker of the final culture concentration. To the best of our knowledge, this is the first time that such concepts have been proposed
Unknown input uncertainty calculation using virtual input shaping and interval analysis
No full textInternational audienceA triaxial accelerometer has been developed to measure and determine the uncertainty associated with unknown vibrations disturbing a small force metrology experiment. However, methodological shortcomings remain regarding the calculation of uncertainty for dynamic measurements. Therefore, this paper proposes an alternative framework to estimate the uncertainty of specific dynamic quantities of interest with a nonlinear and uncertain measuring system. The novelty of the proposed methodology lies in the use of an accurate and equivalent representation of the physical system based on a linear model, combined with an additive virtual input describing all the unknown unmodeled dynamics. Measurement models are defined considering measurement biases, and uncertainty is calculated using interval analysis tools. Such tools allow determining the feasible values of the quantities of interest to be estimated. The innovative aspects of the proposed approach are fully illustrated in simulation on the triaxial accelerometer, comparing linear and nonlinear measurement models in passive mode
Experimental assessment of a programmable Electroacoustic Liner in a representative turbofan facility
No full textInternational audienceThe Flightpath 2050 European Union stringent regulations for aviation noise reduction, along with the new generation of Ultra-High-Bypass-Ratio turbofans to reduce fuel consumption, significantly challenge the scientific community to find unprecedented acoustic liner designs. The SALUTE H2020 project has taken up this challenge, by designing and testing a programmable metasurface made up of electroacoustic resonators. Each electroacoustic resonator is composed by a loudspeaker and four microphones in a compact design, allowing to synthesize tunable local impedance behaviours thanks to a current-driven control strategy. A steel wiremesh mounted onto a perforated plate allows to protect the elctromechanical devices from the aerodynamic disturbances. For the first time, such advanced liner concept has been tested in a scaled turbofan rig: the ECL-B3 PHARE-2 in the Laboratory of Fluid Mechanics and Acoustics of the Ecole Centrale of Lyon. The performances of the electroacoustic liner reported in this paper, correspond to three different regimes: 30%, 40% and 100% of the nominal engine speed. The electroacoustic technology demonstrated robustness faced with a realistic reproduction of actual turbofan conditions, as well as its tunability to target different frequency bandwidth, attaining good radiated noise reduction. The results reported in this experimental campaign open the doors for unprecedented liner designs, by exploiting the huge potentialities of programmable surfaces