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Development and assessment of algorithms for DEM-LES simulations of fluidized bed

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Particuology 2023年第12期83卷 241-257页

作者： fatima Ez-Zahra el Hamra Radouan Boukharfane UM6P College of Computing Mohammed Ⅵ Polytechnic University(UM6P)BenguerirMorocco

The use of high-fidelity Discrete element Method(DEM)coupled with Computational Fluid Dynamics(CFD)for particle-scale simulations demands extensive simulation times and restricts application to small particulate ***-CFD simulations require good performance and satisfactory scalability on high-performance computing platforms.A reliable parallel computing strategy must be developed to calculate the collision forces,since collisions can occur between particles that are not on the same processor,or even across processors whose domains are *** present paper describes a parallelization technique and a numerical verification study based on a number of tests that allow for the assessment of the numerical performance of DEM used in conjunction with Large-Eddy Simulation(LES)to model dense flows in fluidized *** fluid phase is computed through solving the volume-averaged four-way coupling Navier-Stokes equations,in which the Smagorinsky sub-grid scale tensor model is ***,the performance of Sub-Grid Scale(SGS)turbulence models applied to Fluidized Bed Reactor(FBR)configurations has been assessed and *** developed numerical solver represents an interesting combination of techniques that work well for the present purpose of studying particle formation in fluidized beds.

关键词： DEM-LES Fluidized bed Computational efficiency Numerical accuracy

A hydrochemical study of the Hammam Righa geothermal waters in north-central Algeria

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Acta Geochimica 2016年第3期35卷 271-287页

作者： Mohamed Belhai Yasuhiro Fujimitsu fatima zohra Bouchareb-Haouchine Abdelhamid Haouchine Jun Nishijima Department of Earth Resources Engineering GraduateSchool of EngineeringKyushu UniversityFukuoka 819-0395Japan Department of Earth Resources Engineering Faculty ofEngineeringKyushu UniversityFukuoka 819-0395Japan Laboratoire de Geo-Environnement FSTGAT/USTHB BP 32El-Alia16000 AlgiersAlgeria

This study focuses on the hydrochemical characteristics of 47 water samples collected from thermal and cold springs that emerge from the Hammam Righa geothermal field, located in north-central Algeria. The aquifer that feeds these springs is mainly situated in the deeply fractured Jurassic limestone and dolomite of the Zaccar Mount. Measured discharge temperatures of the cold waters range from 16.0 to 26.5 ℃ and the hot waters from 32.1 to 68.2 ℃. All waters exhibited a near-neutral pH of 6.0-7.6. The thermal waters had a high total dis- solved solids （TDS） content of up to 2527 mg/l, while the TDS for cold waters was 659.0-852.0 mg/l. Chemical analyses suggest that two main types of water exist： hot waters in the upflow area of the Ca-Na-SO4 type （Ham- mam Righa） and cold waters in the recharge zone of the Ca-Na-HCO3 type （Zaccar Mount）. Reservoir tempera- tures were estimated using silica geothermometers and fluid/mineral equilibria at 78, 92, and 95℃ for HR4, HR2, and HRI, respectively. Stable isotopic analyses of the δ18O and δD composition of the waters suggest that the thermal waters of Hammam Righa are of meteoric origin. We conclude that meteoric recharge infiltrates through the fractured dolomitic limestones of the Zaccar Mount and is conductively heated at a depth of 2.1-2.2 km. The hotwaters then interact at depth with Triassic evaporites located in the hydrothermal conduit （fault）, giving rise to the Ca-Na-SO4 water type. As they ascend to the surface, the thermal waters mix with shallower Mg-rich ground- water, resulting in waters that plot in the immature water field in the Na-K-Mg diagram. The mixing trend between cold groundwaters from the recharge zone area （Zaccar Mount） and hot waters in the upflow area （Hammam Righa） is apparent via a chloride-enthalpy diagram that shows a mixing ratio of 22.6 〈 R 〈 29.2 %. We summa- rize these results with a geothermal conceptual model of the Hammam Righa geothermal field.

关键词： Thermal waters North-central Algeria Geochemistry Geothermometry Geothermal conceptualmodel Cold groundwaters

Interleukin 7 regulates switch transcription in developing B cells

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Cellular & Molecular Immunology 2021年第3期18卷 776-778页

作者： Audrey Dauba fatima-zohra Braikia Chloe Oudinet Ahmed Amine Kham lichi Mnstitut de Pharmacologie et de Biologie Structurale IPBSUniversite de ToulouseCNRSUniversity Paul Sabatier31077 ToulouseFrance

Class switch recombination(CSR)enables activated mature B cells to change immunoglobulin(Ig)isotype expression from IgM to IgG,IgE,or *** process requires activation-induced cytidine deaminase(AID)expression and transcription of the target sequences at the Ig heavy chain(IgH)constant locus,which is composed of multiple constant(C_(H))genes,each specifying an Ig isotype.

关键词： Interleukin enable IgH

Exponential Stability of Uncertain T-S Fuzzy Switched Systems with Time Delay

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International Journal of Automation and computing 2013年第1期10卷 32-38页

作者： fatima Ahmida el Houssaine Tissir Department of Physics Faculty of Sciences

This paper discusses the delay-dependent exponential stability of a class of uncertain T-S fuzzy switched systems with time delay. The method is based on Lyapunov stability theorem and free weighting matrices approach... 详细信息

关键词： Delay dependent stability exponential stability linear matrix inequalities (LMIs) T-S fuzzy switched systems uncertainty

A Struwe Type Decomposition Result for a Singular elliptic Equation on Compact Riemannian Manifolds

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Analysis in Theory and Applications 2018年第1期34卷 17-35页

作者： Youssef Maliki fatima zohra Terki Department of Mathematics University Aboubekr Belkaid of Tlemcen Higher School in Business and Management TlemcenAlgeria

On a compact Riemannian manifold, we prove a decomposition theorem for arbitrarily bounded energy sequence of solutions of a singular elliptic equation.

关键词： Yamabe equation critical Sobolev exponent Hardy inequality bubbles.

Robust H_∞ Controller Design for Uncertain Neutral Systems via Dynamic Observer Based Output Feedback

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International Journal of Automation and computing 2009年第2期6卷 164-170页

作者： fatima el Haoussi el Houssaine Tissir LESSI Department of Physics Faculty of Sciences

In this paper, the dynamic observer-based controller design for a class of neutral systems with H∞ control is considered. An observer-based output feedback is derived for systems with polytopic parameter uncertainties. This controller assures delay-dependent stabilization and H∞ norm bound attenuation from the disturbance input to the controlled output. Numerical examples are provided for illustration and comparison of the proposed conditions.

关键词： Neutral systems delay-dependent conditions H∞ control design observer linear matrix inequality (LMI) time varyingdelay systems polytopic uncertainties.

Delay and Its Time-derivative Dependent Robust Stability of Uncertain Neutral Systems with Saturating Actuators

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International Journal of Automation and computing 2010年第4期7卷 455-462页

作者： fatima el Haoussi el Houssaine Tissir Presidence of University Sidi Mohammed Ben Abdellah Laboratory of electronics Signals Systems and Data ProcessingDepartment of PhysicsFaculty of SciencesUniversity Sidi Mohammed Ben Abdellah

This note concerns the problem of the robust stability of uncertain neutral systems with time-varying delay and saturating actuators. The system considered is continuous in time with norm bounded parametric uncertainties. By incorporating the free weighing matrix approach developed recently, some new delay-dependent stability conditions in terms of linear matrix inequalities （LMIs） with some tuning parameters are obtained. An estimate of the domain of attraction of the closed-loop system under a priori designed controller is proposed. The approach is based on a polytopic description of the actuator saturation nonlinearities and the Lyapunov- Krasovskii method. Numerical examples are used to demonstrate the effectiveness of the proposed design method.

关键词： Actuator saturation neutral systems unccrtainty delay-dependent condition linear matrix inequality (LMI) time varying delay systems.

Adaptive Backstepping Control Design for Semi-Active Suspension of Half-Vehicle With Magnetorheological Damper

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IEEE/CAA Journal of Automatica Sinica 2021年第3期8卷 582-596页

作者： Khalid el Majdoub Fouad Giri fatima-Zahra Chaoui Department of electrical Engineering University Hassan IIFaculty of Science and TechnologyMohammedia 20030Morocco Department of electrical Engineering University de Caen NormandieCaen 14032France Department of electrical Engineering University Mohamed VRabat 10000Morocco

This paper investigates the problem of controlling half-vehicle semi-active suspension system involving a magnetorheological(MR)*** features a hysteretic behavior that is presently captured through the nonlinear Bouc-Wen *** control objective is to regulate well the heave and the pitch motions of the chassis despite the road *** difficulty of the control problem lies in the nonlinearity of the system model,the uncertainty of some of its parameters,and the inaccessibility to measurements of the hysteresis internal state *** Lyapunov control design tools,we design two observers to get online estimates of the hysteresis internal states and a stabilizing adaptive state-feedback *** whole adaptive controller is formally shown to meet the desired control *** theoretical result is confirmed by several simulations demonstrating the supremacy of the latter compared to the skyhook control and passive suspension.

关键词： Adaptive control backstepping control Bouc-Wen model half vehicle model magnetorheological(MR)damper semiactive suspension skyhook control state observation

Generation of Different Classes of Multipartite Entanglement Using Cavity-QED

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Communications in Theoretical Physics 2018年第2期69卷 131-136页

作者： Mustapha Ziane Rachid el Guerbouz fatima-Zahra Siyouri Morad el Baz Equipe Sciences de la Matière et du Rayonnement Département de Physique Faculté des sciences Université Mohammed V Av.Ibn Battouta

Using a system of cavity quantum electrodynamics （QED） we present two schemes for multipartite entan- glement generation. In the first scheme, a three-level atom is interacting with three cavities successively. In the second one, two three-level atoms are interacted with a coherent optical cavity. These protocols allow us to generate the six c/asses of tripartite entanglement （GHZ, W, A-B-C, AB-C, C-AB, and B-AC class states） by controling the interaction time between atoms and cavities. Moreover, they allow us to generate entanglement between the cavity fields degrees of freedom （from the first scheme）, and a mixed entanglement between the cavity field degrees of freedom and the atomic degrees of freedom.

关键词： entanglement coherent states cavity QE-D GHZ states W states