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Wireless Network requirements and Solutions for the Future Circular Collider:A Hostile Indoor Environment

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China communications 2021年第10期18卷 193-203页

作者： Ahmed Bannour Yichuang Sun University of Carthage InnovCom Laboratory Higher School of Communications of TunisSup’ComCite Technologique des´Communications Route de Raoued Km 352083 El Ghazala Ariana Tunisie TunisTunisia University of Hertfordshire School of Engineering and TechnologyHatfieldHertsAL109ABUK

The European organization for nuclear research(CErN)is planning a high performance particle collider by 2050,which will update the currently used Large Hadron Collider(LHC).The design of the new experiment facility includes the definition of a suitable communication infrastructure to support the future needs of *** huge amount of data collected by the measurement devices call for a data rate of at least 1 Gb/s per node,while the need of timely control of instruments requires a low latency of the order of 0.01μ***,the main tunnel will be 100 km long,and will need appropriate coverage for voice and data traffic,in a special underground environment subject also to strong *** voice,data and video transmission in a tunnel of this length is necessary to ensure timely and localized intervention,reducing access *** addition,using wireless communication for voice,control and data acquisition of accelerator technical systems could lead to a significant reduction in cabling costs,installation times and maintenance *** communication infrastructure of the Future Circular Collider(FCC)tunnel must be able to circumvent the problems of radioactivity,omnipresent in the *** technologies transceivers cannot transmit in such a severely radioactive *** is due to the immediate destruction of any active or passive equipment by *** scope of this paper is to determine the feasibility of robust wireless transmission in an underground radioactive tunnel *** network infrastructure design to meet the demand will be introduced,and the performance of different wireless technologies will be evaluated.

关键词： future circular collider LHC tunnel low latency harsh indoor wireless communications

Cr-Doped TiO_(2)Thin Films Prepared by Means of a Magnetron Co-Sputtering Process:Photocatalytic Application

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American Journal of Analytical Chemistry 2014年第8期5卷 473-482页

作者： Anouar Hajjaji Atef Atyaoui Khaled Trabelsi Mosbah Amlouk Latifa Bousselmi Brahim Bessais My Ali El Khakani Mounir Gaidi Institut National de la recherche Scientifique INRS-EnergieMatériaux et TélécommunicationsVarennesCanada Laboratoire de Photovoltaique Centre de Recherches et des Technologies de l’EnergieTechnopole de Borj-CédriaHammam-LifTunisia Laboratoire de Traitement et de recyclage des Eaux Centre de Recherches et des Technologies des EauxTechnopole de Borj-CedriaHammam-LifTunisia Unitéde Physique des DispositifsàSemi-Conducteurs Facultédes Sciences de TunisCampus UniversitaireTunisTunisia department of Applied Physics University of SharjahSharjahUAE

This paper deals with the effect of Cr content on photocatalytic activity of TiO2 thin films deposited on quartz and intrinsic silicon substrates by using the rF magnetron co-sputtering process. Some physical investigations on such sputtered films were made by means of X-ray Diffraction (XrD), atomic force microscopy (AFM), raman spectroscopy as well as UV-Vis-Ir absorption techniques. The heat treatment under oxygen atmosphere at 550°C reveals that the crystalline structure of TiO2: Cr depends on Cr content. Anatase-to-rutile phase transformation occurs at a Cr content of about 7%. On the other hand, the band gap energy value of annealed TiO2: Cr films varies in terms of Cr doping and a transition around 7% of Cr is accrued. The photocatalytic activity of undoped and doped TiO2 films was evaluated by photo-degrading of the amido black under UV light irradiation. Modification of the chemical structure of titanium dioxide by Cr doping allows moving the photocatalytic activity of titanium dioxide towards visible light. The results indicate that films doped with 2% Cr exhibit the highest UV and visible light photocatalytic activity.

关键词： TiO_(2) Cr-Doped TiO_(2) Photocatalysis Opto-Electronic

Exotic Hadrons and Underlying Z_(2,3) Symmetries

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communications in Theoretical Physics 2015年第12期64卷 697-700页

作者： Adil Belhaj Salah Eddine Ennadifi Moulay Brahim Sedra Département de Physique Faculté PolydisciplinaireUniversité Sultan Moulay Slimane LPHE-MS Faculté des SciencesUniversité Mohammed V Département de Physique SIMO-FSKFaculté des SciencesUniversité Ibn Tofail Kénitra

The recent observation of higher quark combinations, tetraquarks and pentaquarks, is a strong indication of more exotic hadrons. Using Z_2 and Z_3 symmetries and standard model data, a general quark combination producing new hadronic states is proposed in terms of polygon geometries according to the Dynkin diagrams of ?_n affine Lie algebras. It has been shown that Z_(2,3) invariance is crucial in the determination of the mesonic or the baryonic nature of these states. The hexagonal geometry is considered in some details producing both mesonic and baryonic states. A general class of this family is also presented.

关键词： standard model exotic hadrons and Lie symmetries

Analytical Solution for Waves Propagation in Heterogeneous Acoustic/Porous Media. Part I: The 2D Case

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communications in Computational Physics 2010年第3期7卷 171-194页

作者： Julien Diaz Abdelaaziz Ezziani Project-team Magique-3D INRIA Bordeaux Sud-Ouest LMA Pau CNRS UMR 5142I.P.R.A-Universit´e de Pau et des Pays de l’Adouravenue de l’Universit´e BP 1155-64013 PAU CEDEXFrance

Thanks to the Cagniard-de Hoop’s method we derive the solution to theproblem of wave propagation in an infinite bilayered acoustic/poroelastic media, wherethe poroelastic layer is modelled by the biphasic Biot’s model. This first part is dedi-cated to solution to the two-dimensional problem. We illustrate the properties of thesolution, which will be used to validate a numerical code.

关键词： Biot’s model poroelastic waves acoustic waves acoustic/poroelastic coupling ana-lytical solution Cagniard-de Hoop’s technique 2D

FullAperturereconstruction of theAcoustic Far-Field Pattern from Few Measurements

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communications in Computational Physics 2012年第2期11卷 647-659页

作者： Helene Barucq Chokri Bekkey rabia Djellouli INrIA Bordeaux Sud-Ouest research Center Team Project Magique-3D&LMA/CNRS UMR 5142Universite de Pau et des Pays de l’AdourFrance Faculte des Sciences de Monastir Tunisia department of Mathematics California State University Northridge&Interdisciplinary Research Institute for the SciencesIRISUSA

We propose a numerical procedure to extend to full aperture the acoustic farfield pattern(FFP)when measured in only few observation *** reconstruction procedure is a multi-step technique that combines a total variation regularized iterative method with the standard Tikhonov regularized *** proposed approach distinguishes itself from existing solution methodologies by using an exact representation of the total variation which is crucial for the stability and robustness of Newton *** present numerical results in the case of two-dimensional acoustic scattering problems to illustrate the potential of the proposed procedure for reconstructing the full aperture of the FFP from very few noisy data such as backscattering synthetic measurements.

关键词： Acoustic scattering problem limited aperture inverse obstacle problem ill-posed problem total variation Tikhonov regularization Newton method

On Single Distribution Lattice Boltzmann Schemes for the Approximation of Navier Stokes Equations

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communications in Computational Physics 2023年第8期34卷 613-671页

作者： Francois Dubois Pierre Lallemand Laboratoire de Mathematiques d’Orsay Faculte des Sciences d’OrsayUniversite Paris-SaclayFrance Conservatoire National des Arts et Metiers LMSSC laboratoryParisFrance International research Laboratory 3457 Centre National de la Recherche ScientifiqueCentre de Recherches MathematiquesUniversite de MontrealMontrealQCCanada Beijing Computational Science research Center Haidian DistrictBeijing 100094China

In this contribution we study the formal ability of a multi-resolution-times lattice Boltzmann scheme to approximate isothermal and thermal compressible Navier Stokes equations with a single particle *** precisely,we consider a total of 12 classical square lattice Boltzmann schemes with prescribed sets of conserved and nonconserved *** question is to determine the algebraic expressions of the equilibrium functions for the nonconserved moments and the relaxation parameters associated to each *** compare the fluid equations and the result of the Taylor expansion method at second order accuracy for bidimensional examples with a maximum of 17 velocities and three-dimensional schemes with at most 33 *** some cases,it is not possible to fit exactly the physical *** several examples,we adjust the Navier Stokes equations and propose nontrivial expressions for the equilibria.

关键词： Partial differential equations asymptotic analysis

Numerical Study of Solutions of the 3D Generalized Kadomtsev-Petviashvili Equations for Long Times

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communications in Computational Physics 2009年第10期6卷 1022-1062页

作者： F.Hamidouche Y.Mammeri S.M.Mefire Laboratoire de Mathematiques CNRS UMR 8628Universite Paris-Sud 1191405 Orsay CedexFrance Laboratoire de Mathematiques–Paul Painleve CNRS UMR 8524Universite des Sciences et Technologies de Lille59655 Villeneuve d’Ascq CedexFrance Laboratoire Amienois de Mathematique Fondamentale et Appliquee CNRS UMR 6140Universite de Picardie33 r.Saint-Leu80039 Amiens Cedex 1France

From a spectral method combined with a predictor-corrector scheme,we numerically study the behavior in time of solutions of the three-dimensional generalized Kadomtsev-Petviashvili *** a systematic way,the dispersion,... 详细信息

关键词： 3D-KP equations spectral method predictor-corrector method dispersion blow-up soliton transverse instability

Bunching and Antibunching in Cavity QED

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communications in Theoretical Physics 2011年第7期56卷 134-138页

作者： H.Jabri H.Eleuch Dpartement de Physique Facult des Sciences de Tunis Institute for Quantum Studies Texas A & M UniversityCollege Station Texas University of Carthage

We study the statistics of the emitted filed from rydberg atom confined inside a microcavity and interacting with a pump laser in the strong coupling regime. We explore the manifestation of the antibunching in connect... 详细信息

关键词： quantum fluctuations quantum noise photon statistics cavity quantum electrodynamics

Enhanced photocatalytic activities of silicon nanowires/graphene oxide nanocomposite:Effect of etching parameters

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Journal of Environmental Sciences 2021年第3期33卷 123-134页

作者： Mounir Gaidi Kais Daoudi Soumya Columbus Anouar Hajjaji My Ali El Khakani Brahim Bessais department of Applied Physics and Astronomy University of SharjahSharjah 27272United Arab Emirates Sharjah Centre for Advanced Materials research Research Institute of Sciences and EngineeringUniversity of SharjahSharjah 27272United Arab Emirates Sharjah Sharjah research Academy University CitySharjah 60999United Arab Emirates Sharjah Laboratoire de Photovoltaïque Centre de Recherches et des Technologies de l’EnergieTechnopole de Borj-CédriaHammam-Lif 2050Tunisia Institut National de la recherche Scientifique(INrS) INRS-ÉnergieMatériaux et Télécommunications1650Blvd.Lionel-BouletVarennesQC J3X-1S2Canada

Homogeneous and vertically aligned silicon nanowires(SiNWs)were successfully fabricated using silver assisted chemical etching *** prepared samples were characterized using scanning electron microscopy,transmission electron microscopy and atomic force *** degradation properties of graphene oxide(GO)modified SiNWs have been *** found that the SiNWs morphology depends on etching time and etchant *** SiNWs length could be tuned from 1 to 42μm,respectively when varying the etching time from 5 to 30 *** etchant concentration was found to accelerate the etching process;doubling the concentrations increases the length of the SiNWs by a factor of two for fixed etching *** in bundle morphology were also studied as function of etching *** SiNWs diameter was found to be independent of etching time or etchant composition while the size of the SiNWs bundle increases with increasing etching time and etchant *** addition of GO was found to improve significantly the photocatalytic activity of SiNWs.A strong correlation between etching parameters and photocatalysis efficiency has been observed,mainly for SiNWs prepared at optimum etching time and etchant concentrations of 10 min and 4:1:8.A degradation of92%was obtained which further improved to 96%by addition of hydrogen *** degradation efficiency of 16%and 31%has been observed for bare Si and GO/bare Si samples *** obtained results demonstrate that the developed SiNWs/GO composite exhibits excellent photocatalytic performance and could be used as potential platform for the degradation of organic pollutants.

关键词： Photocatalysis Nanomaterials Methylene Blue Silicon nanowire Graphene oxide Water treatment