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Production of Artificial Fog in the PAVIN Fog and Rain Platform: In Search of Big Droplets Fog

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Atmospheric and Climate Sciences 2024年第1期14卷 42-61页

作者： Pierre Duthon Mickaël Ferreira Fernandes Sébastien Liandrat Cerema Reasearch Team STI 8-10 Rue Bernard Palissy Clermont-Ferrand France

In fog, visibility is reduced. This reduction in visibility is measured by the meteorological optical range (MOR), which is important for studying human perception and various sensors in foggy conditions. The Cerema PAVIN Fog & Rain platform is capable of producing calibrated fog in order to better analyses it and understand its consequences. The problem is that the droplets produced by the platform are not large enough to resemble real fog. This can have a major impact on measurements since the interaction between electromagnetic waves and fog depends on the wavelength and diameter of the droplets. To remedy this, Cerema is building a new platform with new equipment capable of generating fog. This study analyses different nozzles and associated usage parameters such as the type of water used and the pressure used. The aim is to select the best nozzle with the associated parameters for producing large-diameter droplets and therefore more realistic fog.

关键词： Fog Physical Simulation Droplets Size Distribution Meteorological Optical Range

Optimising Energy Consumption in SD-DCN Networks (Software Defined-Data Center Network)

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Open Journal of Applied Sciences 2024年第8期14卷 2223-2235页

作者： Narcisse Tahi Etienne Soro Pacôme Brou Olivier Asseu UMRI sti INPHB INPHouphout Boigny Yamoussoukro Cte dIvoire Ecole Suprieure Africaine des Technologies de lInformation et de la Communication (ESATIC) LASTIC Laboratory of ESATIC Abidjan Cte dIvoire

Over the last decade, the rapid growth in traffic and the number of network devices has implicitly led to an increase in network energy consumption. In this context, a new paradigm has emerged, Software-Defined Networking (SDN), which is an emerging technique that separates the control plane and the data plane of the deployed network, enabling centralized control of the network, while offering flexibility in data center network management. Some research work is moving in the direction of optimizing the energy consumption of SD-DCN, but still does not guarantee good performance and quality of service for SDN networks. To solve this problem, we propose a new mathematical model based on the principle of combinatorial optimization to dynamically solve the problem of activating and deactivating switches and unused links that consume energy in SDN networks while guaranteeing quality of service (QoS) and ensuring load balancing in the network.

关键词： DCN Optimisation Energy Consumption QoS SDN

Adaptation of Federated Explainable Artificial Intelligence for Efficient and Secure E-Healthcare Systems

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Computers, Materials & Continua 2024年第3期78卷 3413-3429页

作者： Rabia Abid Muhammad Rizwan Abdulatif Alabdulatif Abdullah Alnajim Meznah Alamro Mourade Azrour Department of Computer Science Kinnaird College for WomenLahorePakistan College of Science and Engineering University of DerbyDerbyDE221GBUK Department of Computer Science College of ComputerQassim UniversityBuraydah51452Saudi Arabia Department of Information Technology College of ComputerQassim UniversityBuraydah51452Saudi Arabia Department of Information Technology College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityRiyadh84428Saudi Arabia sti Laboratory IDMS TeamFaculty of Sciences and TechniquesMoulay Ismail University of MeknèsMeknesMorocco

Explainable Artificial Intelligence(XAI)has an advanced feature to enhance the decision-making feature and improve the rule-based technique by using more advanced Machine Learning(ML)and Deep Learning(DL)based *** this paper,we chose e-healthcare systems for efficient decision-making and data classification,especially in data security,data handling,diagnostics,laboratories,and *** Machine Learning(FML)is a new and advanced technology that helps to maintain privacy for Personal Health Records(PHR)and handle a large amount of medical data *** this context,XAI,along with FML,increases efficiency and improves the security of e-healthcare *** experiments show efficient system performance by implementing a federated averaging algorithm on an open-source Federated Learning(FL)*** experimental evaluation demonstrates the accuracy rate by taking epochs size 5,batch size 16,and the number of clients 5,which shows a higher accuracy rate(19,104).We conclude the paper by discussing the existing gaps and future work in an e-healthcare system.

关键词： Artificial intelligence data privacy federated machine learning healthcare system security

Quantum-mechanical effects in photoluminescence from thin crystalline gold films

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Light(Science & Applications) 2024年第4期13卷 783-794页

作者： Alan R.Bowman Alvaro Rodríguez Echarri Fatemeh Kiani Fadil Iyikanat Ted V.Tsoulos Joel D.Cox Ravishankar Sundararaman F.Javier García de Abajo Giulia Tagliabue Laboratory of Nanoscience for Energy Technologies(LNET) STIÉcole Polytechnique Fédérale de Lausanne(EPFL)LausanneSwitzerland ICFO–Institut de Ciencies Fotoniques The Barcelona Institute of Science and TechnologyCastelldefels(Barcelona)Spain. MBI–Max-Born-Institut BerlinGermany. POLIMA–Center for Polariton-driven Light–Matter Interactions University of Southern DenmarkOdense MDenmark. Danish Institute for Advanced Study University of Southern DenmarkOdense MDenmark. Department of Materials Science&Engineering Rensselaer Polytechnic InstituteTroyNYUSA. Department of Physics Applied Physicsand AstronomyRensselaer Polytechnic InstituteTroyNYUSA. ICREA–Institucio Catalana de Recerca i Estudis Avancats BarcelonaSpain

Luminescence constitutes a unique source of insight into hot carrier processes in metals,including those in plasmonic nanostructures used for sensing and energy ***,being weak in nature,metal luminescence remains poorly understood,its microscopic origin strongly debated,and its potential for unraveling nanoscale carrier dynamics largely ***,we reveal quantum-mechanical effects in the luminescence emanating from thin monocrystalline gold ***,we present experimental evidence,supported by first-principles simulations,to demonstrate its photoluminescence origin(i.e.,radiative emission from electron/hole recombination)when exciting in the interband *** model allows us to identify changes to the measured gold luminescence due to quantum-mechanical effects as the gold film thickness is ***,such effects are observable in the luminescence signal from flakes up to 40 nm in thickness,associated with the out-of-plane discreteness of the electronic band structure near the Fermi *** qualitatively reproduce the observations with first-principles modeling,thus establishing a unified description of luminescence in gold monocrystalline flakes and enabling its widespread application as a probe of carrier dynamics and light-matter interactions in this *** study paves the way for future explorations of hot carriers and charge-transfer dynamics in a multitude of material systems.

关键词： luminescence quantum crystalline

Microphase separation of a miscible binary liquid mixture under confinement at the nanoscale

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npj Computational Materials 2019年第1期5卷 766-775页

作者： Ilham Essafri Denis Morineau Aziz Ghoufi Institut de Physique de Rennes IPRCNRS-Universitéde Rennes 1UMR CNRS 625135042 RennesFrance

Recent experimental works suggested that the confinement into a cylindrical nanopore induced the microphase separation of a binary liquid,despite the miscible character of its bulk counterpart.A core–shell organization was evidenced such that one of the liquids was strongly anchored to the solid surface whereas the other was confined at the center of the *** the same time,a study based on atomistic simulations suggested a strong heterogeneity and the absence of a *** this work,by refining the solid–liquid interactions to qualitatively reproduce the experimental adsorption isotherms of both single liquids,the microphase separation and the core–shell structure are *** tuning the surface chemistry of the nanopore to mimic hydrophilic and hydrophobic confinement,we show that it is possible to control the structural characteristics of the core–shell *** molecular origin of the microphase separation is then ascribed to the strong hydrogen bonds and a commensurate arrangement between the confining material and both liquids.

关键词： separation liquid binary

A Comparative Study of the Local Heat Transfer Distributions Around Various Surface Mounted Obstacles

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Journal of Thermal Science 2014年第2期23卷 169-176页

作者： Robert Wyssmann Dirk Ullmer Alexandros Terzis Peter Ott Group of Thermal Turbomachinery(GTT) cole Polytechnique Fédérale de Lausanne (EPFL)SCI-STI-POCH-1015LausanneSwitzerland

In many engineering applications,heat transfer enhancement techniques are of vital importance in order to ensure reliable thermal designs of convective heat transfer *** study examines experimentally the heat transfer characteristics on the base plate around various surface mounted *** convection coefficients are evaluated in the vicinity of each individual protruding body with great spatial resolution using the transient liquid crystal *** different obstacles of constant height-to-hydraulic diameter ratio(~1.3) are *** include:a cylinder,a square,a triangle,a diamond and a vortex generator of delta wing shape *** experiments were carried out over a range of freestream Reynolds numbers,based on the hydraulic diameter of each obstacle,varying from 4,000 to 13,*** results indicate a negligible effect of the flow speed on the heat transfer topological structure and a considerable effect of the obstacle geometry on the level and distribution of heat transfer enhancement.

关键词： surface obstacles heat transfer enhancement transient liquid crystal technique

基于CiteSpace的高职财务管理专业人才培养可视化研究

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学园 2024年第24期 59-62页

作者：时仅罗芳云南国土资源职业学院商务信息学院菲律宾sti西内格罗斯大学(stiWest Negros University) 昆明市前沿信息研究中心

基于CiteSpace软件，对中国知网数据库检索到的489篇高职财务管理专业人才培养相关文献进行可视化研究。研究发现，2002年以来，高职财务管理专业人才培养研究相关文献数量总体上呈逐年增加的趋势，并于2015年和2019年分别迎来了2次研... 详细信息

基于CiteSpace软件，对中国知网数据库检索到的489篇高职财务管理专业人才培养相关文献进行可视化研究。研究发现，2002年以来，高职财务管理专业人才培养研究相关文献数量总体上呈逐年增加的趋势，并于2015年和2019年分别迎来了2次研究高峰，发文作者和机构的合作程度不高，独立合作、单次合作较多，仅存在部分小规模的研究合作，研究热点包括人才培养模式、教育教学改革等。结果显示，现有人才培养和人才需求之间仍存在一定的差距，未来需要进一步结合大数据时代的发展对人才培养方案作出相应调整。

关键词： CiteSpace软件高职财务管理专业人才培养可视化分析方法

Design and analysis of a recommendation system based on collaborative filtering techniques for big data

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Intelligent and Converged Networks 2023年第4期4卷 296-304页

作者： Najia Khouibiri Yousef Farhaoui Ahmad El Allaoui sti Laboratory IDMT-IDMSFaculty of Sciences and Techniques ErrachidiaMoulay Ismail UniversityMeknes 5003Morocco

Online search has become very popular,and users can easily search for any movie title;however,to easily search for moving titles,users have to select a title that suits their ***,people will have difficulty choosing the film they want to *** process of choosing or searching for a film in a large film database is currently time-consuming and *** spend extensive time on the internet or on several movie viewing sites without success until they find a film that matches their *** happens especially because humans are confused about choosing things and quickly change their ***,the recommendation system becomes *** study aims to reduce user effort and facilitate the movie research ***,we used the root mean square error scale to evaluate and compare different models adopted in this *** models were employed with the aim of developing a classification model for predicting ***,we tested and evaluated several cooperative filtering *** used four approaches to implement sparse matrix completion algorithms:k-nearest neighbors,matrix factorization,co-clustering,and slope-one.

关键词： recommendation system machine learning collaborative filtering(CF) decision support system big data

Modeling of Radon and Its Short-Lived Decay Products during Showering: Dose to Adult Members of the Public

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World Journal of Nuclear Science and Technology 2021年第2期11卷 84-99页

作者： Rabi Rabi Lhoucine Oufni Khamiss Cheikh El-Houcine Youssoufi Hamza Badry Youssef Errami Department of Physics (lpm) Sultan Moulay Sliman University Beni-Mellal Morocco Department of Physics (lpm) Chouaib Doukkali University El Jadida Morocco

Human exposure to radon inside different parts of the house has become a great concern. In this study, the distribution of radon and its decay inside the shower will be numerically investigated. In fact, the radon concentration in water is measured through the use of AlphaGUARD. They are used as an input for CFD simulation. The numerical results proved that temperature and humidity have significant impacts on both radon content and distribution. Also, the equilibrium factor variations between radon and its progeny with the temperature and relative humidity were carefully looked at. The equivalent doses due to 218Po and 214Po were evaluated in different tissues of the respiratory tract of the members of the public from the inhalation of air inside the shower. The annual effective dose due to radon short lived decay from the inhalation of air inside the shower by the members of the public was also investigated.

关键词： Radon Temperature Shower Computational Fluid Dynamics (CFD) Effective Dose