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Effects of variable properties on MHD heat and mass transfer flow near a stagnation point towards a stretching sheet in a porous medium with thermal radiation

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Chinese Physics B 2012年第5期21卷 353-363页

作者： A.M.Salem Rania Fathy department of Basic Science Faculty of Computer&InformaticsSuez Canal University department of Mathematics Faculty of ScienceZagazig University

The effect of variable viscosity and thermal conductivity on steady magnetohydrodynamic（MHD） heat and mass transfer flow of viscous and incompressible fluid near a stagnation point towards a permeable stretching sheet embedded in a porous medium are presented,taking into account thermal radiation and internal heat genberation/*** stretching velocity and the ambient fluid velocity are assumed to vary linearly with the distance from the stagnation *** Rosseland approximation is used to describe the radiative heat flux in the energy *** governing fundamental equations are first transformed into a system of ordinary differential equations using a scaling group of transformations and are solved numerically by using the fourth-order Rung-Kutta method with the shooting technique.A comparison with previously published work has been carried out and the results are found to be in good *** results are analyzed for the effect of different physical parameters,such as the variable viscosity and thermal conductivity,the ratio of free stream velocity to stretching velocity,the magnetic field,the porosity,the radiation and suction/injection on the flow,and the heat and mass transfer *** results indicate that the inclusion of variable viscosity and thermal conductivity into the fluids of light and medium molecular weight is able to change the boundary-layer behavior for all values of the velocity ratio parameter λ except for λ = *** addition,the imposition of fluid suction increases both the rate of heat and mass transfer,whereas fluid injection shows the opposite effect.

关键词： variable viscosity variable thermal conductivity stagnation point

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Contribution for a Better Understanding of the Technological Sustainability in Electrical Energy Production through Photovoltaic Cells

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Journal of Energy and Power Engineering 2011年第6期5卷 542-547页

作者： R.P. Mendes L.C. Goncalves P.D. Gaspar Electromechanical Engineering department Engineering Faculty University of Beira Interior Covilha 6201-001 Portugal

The conversion of solar energyinto electricity reveals a huge importance in the production of＂clean＂ energy, mainly when applied to decentralized production systems （micro-generation）. However, there is the need to develop and optimize these processes in order to turn it more sustainable in economic and technological scoops. The main purpose of this work is to study the solar energy conversion into electricity through photovoltaic cells, characterizing the process efficiencies. This study intends to evaluate the energetic and exergetic efficiencies defining them as indicators in the formulation ofa sustainability index. All the procedures are in a theoretical scope with an illustrative example in the end of this work.

关键词： Sustainability index energy exergy photovoltaic indicators.

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Low-cost cloud computing solution for geo-information processing

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Journal of Central South university 2016年第12期23卷 3217-3224页

作者：高培超刘钊谢美慧田琨 department of Land Surveying and Geo-informatics Hong Kong Polytechnic University Institute of Geomatics Department of Civil EngineeringTsinghua University

Cloud computing has emerged as a leading computing paradigm,with an increasing number of geographic information(geo-information) processing tasks now running on *** this reason,geographic information system/remote sensing(GIS/RS) researchers rent more public clouds or establish more private ***,a large proportion of these clouds are found to be underutilized,since users do not deal with big data every *** low usage of cloud resources violates the original intention of cloud computing,which is to save resources by improving *** this work,a low-cost cloud computing solution was proposed for geo-information processing,especially for temporary processing *** proposed solution adopted a hosted architecture and can be realized based on ordinary computers in a common GIS/RS *** usefulness and effectiveness of the proposed solution was demonstrated by using big data simplification as a case *** to commercial public clouds and dedicated private clouds,the proposed solution is more low-cost and resource-saving,and is more suitable for GIS/RS applications.

关键词： cloud computing geo-information processing geo-processing

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A Survey on Multiview Video Synthesis and Editing

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Tsinghua Science and Technology 2016年第6期21卷 678-695页

作者： Shaoping Lu Taijiang Mu Songhai Zhang the department of Electronics and informatics (ETRO) Vrije Universiteit Brussel (VUB) the TNList Tsinghua University

Multiview video can provide more immersive perception than traditional single 2-D video. It enables both interactive free navigation applications as well as high-end autostereoscopic displays on which multiple users can perceive genuine 3-D content without glasses. The multiview format also comprises much more visual information than classical 2-D or stereo 3-D content, which makes it possible to perform various interesting editing operations both on pixel-level and object-level. This survey provides a comprehensive review of existing multiview video synthesis and editing algorithms and applications. For each topic, the related technologies in classical 2-D image and video processing are reviewed. We then continue to the discussion of recent advanced techniques for multiview video virtual view synthesis and various interactive editing applications. Due to the ongoing progress on multiview video synthesis and editing, we can foresee more and more immersive 3-D video applications will appear in the future.

关键词： multiview video view synthesis video editing color correction survey

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Digital twins and multi-access edge computing for IIoT

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Virtual Reality & Intelligent Hardware 2022年第6期4卷 521-534页

作者： Andreas P.PLAGERAS Konstantinos E.PSANNIS department of Applied informatics University of Macedonia54636Greece

Background All recent technological findings can be collectively used to strengthen the industrial Internet of things(IIoT)*** novel technology of multi-access edge computing or mobile edge computing(MEC)and digital twins have advanced rapidly in the *** is the middle layer between mobile devices and the cloud,and it provides scalability,reliability,security,efficient control,and storage of *** twins form a communication model that enhances the entire system by improving latency,overhead,and energy *** The main focus in this study is the biggest challenges that researchers in the field of IIoT have to overcome to obtain a more efficient communication environment in terms of technology integration,efficient energy and data delivery,storage spaces,security,and real-time control and ***,a distributed system is established in a local network,in which several functions *** addition,an MEC-based framework is proposed to reduce traffic and latency by merging the processing of data generated by IIoT devices at the edge of the *** critical parts of the proposed IIoT system are evaluated by using emulation *** The results show that data delivery and offloading are performed more efficiently,energy consumption and processing are improved,and security,complexity,control,and reliability are *** The proposed framework and application provide authentication and integrity to end users and IoT devices.

关键词： Digital twins Energy efficiency IIoT Load balance MCC MEC Protocols

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The influence of different exercise intensities on kicking accuracy and velocity in soccer players

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Journal of Sport and Health Science 2017年第4期6卷 462-467页

作者： Ricardo Ferraz Roland van den Tillar Mario C. Marques department of Sports Sciences University of Beira Interior Convento de St Antonio Covilha 6200-001 Portugal Research Center in Sport Sciences Health Sciences and Human Development CIDESD Vila Real 5000-801 Portugal department of Teacher Education Nord Trondelag University College Levanger 7600 Norway

Purpose: The aim of this study was to investigate the influence of different exercise intensities induced by a soccer specific protocol on kicking performance in soccer ***: Twelve semi-professional male soccer players participated in this study and performed maximal instep kicks before and after the implementation of an exercise protocol to determine the influence of different intensities upon kicking ball velocity and the target-hitting ***: Analysis of variance designs with repeated measures showed that maximal ball velocity was affected only after the most intense circuit(F(6, 66) = 2.3; p = 0.041; η2= 0.18), while accuracy was not affected in the protocol(F(6, 66) = 0.19; p = 0.98; η2= 0.02). Low and moderate intensities did not affect accuracy or kicking ball ***: These findings suggest that kicking ball velocity is influenced by high-exercise intensities. Low and moderate exercise intensities do not affect the performance of the kick, and intensity does not influence accuracy. Otherwise, it is possible that other mechanisms(not only physiological) may influence players during the exercise.

关键词： Exercise intensity Fatigue Kicking soccer Pacing

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Fabrication of bimetallic Ag/Fe immobilized on modified biochar for removal of carbon tetrachloride

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Journal of Environmental Sciences 2017年第4期29卷 346-357页

作者： Hongwei Wu Qiyan Feng School of Environmental Science and Spatial informatics China University of Mining and Technology department of Chemistry Zaozhuang University

As an effective conventional absorbent, biochar exhibited limited adsorption ability toward small hydrophobic molecules. To enhance the adsorption capacity, a novel adsorbent was prepared by immobilizing nanoscale zero-valent iron onto modified biochar（MB） and then the elemental silver was attached to the surface of iron（Ag/Fe/MB）. It＇s noted that spherical Ag/Fe nanoparticles with diameter of 51 nm were highly dispersed on the surface of MB. As the typical hydrophobic contaminant, carbon tetrachloride was selected for examining the removal efficiency of the adsorbent. The removal efficiencies of carbon tetrachloride by original biochar（OB）, Ag/Fe, Ag/Fe/OB and Ag/Fe/MB were fully investigated. It＇s found that Ag/Fe/MB showed higher carbon tetrachloride removal efficiency, which is about 5.5 times higher than that of the OB sample due to utilizing the merits of high adsorption and reduction. Thermodynamic parameters revealed that the removal of carbon tetrachloride by Ag/Fe/MB was a spontaneous and exothermic process, which was affected by solution p H, initial carbon tetrachloride concentration and temperature. The novel Ag/Fe/MB composites provided a promising material for carbon tetrachloride removal from effluent.

关键词： Bimetallic Ag/Fe nanoparticles Modified biochar Carbon tetrachloride

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Observation and modeling of tide- and wind-induced surface currents in Galway Bay

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Water Science and Engineering 2015年第4期8卷 345-352页

作者： Lei Ren Stephen Nash Michael Hartnett department of Civil Engineering College of Engineering and Informatics National University of Ireland

A high-frequency radar system has been deployed in Galway Bay, a semi-enclosed bay on the west coast of Ireland. The system provides surface currents with fine spatial resolution every hour. Prior to its use for model validation, the accuracy of the radar data was verified through comparison with measurements from acoustic Doppler current profilers （ADCPs） and a good correlation between time series of surface current speeds and directions obtained from radar data and ADCP data. Since Galway Bay is located on the coast of the Atlantic Ocean, it is subject to relatively windy conditions, and surface currents are therefore strongly wind-driven. With a view to assimilating the radar data for forecasting purposes, a three-dimensional numerical model of Galway Bay, the Environmental Fluid Dynamics Code （EFDC）, was developed based on a terrain-following vertical （sigma） coordinate system. This study shows that the performance and accuracy of the numerical model, particularly with regard to tide- and wind-induced surface currents, are sensitive to the vertical layer structure. Results of five models with different layer structures are presented and compared with radar measurements. A variable vertical structure with thin layers at the bottom and the surface and thicker layers in the middle of the water column was found to be the optimal layer structure for reproduction of tideand wind-induced surface currents. This structure ensures that wind shear can properly propagate from the surface layer to the sub-surface layers, thereby ensuring that wind forcing is not overdamped by tidal forcing. The vertical layer structure affects not only the velocities at the surface layer but also the velocities further down in the water column.

关键词： Wind-induced surface current Vertical layer structure High-frequency radar Coastal ocean dynamics application radar Environmental fluid dynamicscode Galway Bay

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Optical RAM and integrated optical memories:a survey

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Light(Science & Applications) 2020年第1期9卷 1117-1132页

作者： Theoni Alexoudi George Theodore Kanellos Nikos Pleros department of informatics Aristotle University of ThessalonikiThessalonikiGreece department of Electrical&Electronic Engineering University of BristolBristolUK

The remarkable achievements in the area of integrated optical memories and optical random access memories(RAMs)together with the rapid adoption of optical interconnects in the Datacom and Computercom industries introduce a new perspective for information storage directly in the optical domain,enabling fast access times,increased bandwidth and transparent cooperation with optical interconnect *** article reviews state-of-the-art integrated optical memory technologies and optical RAM cell demonstrations describing the physical mechanisms of several key devices along with their performance metrics in terms of their energy,speed and *** applications are outlined,concluding with the scaling challenges to be addressed toward allowing light to serve as both a datacarrying and data-storage medium.

关键词： RAM transparent scaling

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Tableau Systems for Paraconsistency and Minimal Inconsistency

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Journal of Computer Science & Technology 1998年第2期13卷 174-188页

作者：林作铨 *** department of informatics Peking University Beijing P.R. China

In this paper, the sematics of a paraconsistent logic and its nonmonotonic extension by minimal inconsistency are presented first. And then signed tableaux for paraconsistelit logic and minimal tableaux for logic of minimal inconsistency is proposetl. Finally the reduction of logic of paraconsistency and minimal inconsistency on ordinary semantics which provides new approach to proof procedure and implementation of paraconsistency and minimal inconsistency are provided.

关键词： Tableaux,logic of paradox paraconsistent logic minimal inconsistency nonmonotonic logic circumscription

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