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Numerical simulation of MHD natural convection flow in a wavy cavity filled by a hybrid cu-Al2O3-water nanofluid with discrete heating

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Applied Mathematics and Mechanics(English Edition) 2020年第9期41卷 1345-1358页

作者： c.REVNIc t.GROSAN M.SHEREMEt I.POP Faculty of Pharmacy University of Medicine and PharmacyCluj-Napoca 400012Romania Department of Mathematics Babes-Bolyai UniversityCluj-Napoca 400084Romania Department of theoretical Mechanics Tomsk State UniversityTomsk 634050Russia

We consider the combined effect of the magnetic field and heat transfer inside a square cavity containing a hybrid nanofluid(cu-Al2O3-water).the upper and bottom walls of the cavity have a wavy *** temperature of the vertical walls is lower,the third part in the middle of the bottom wall is kept at a constant higher temperature,and the remaining parts of the bottom wall and the upper wall are thermally *** magnetic field is applied under the angleγ,an opposite clockwise *** the numerical simulation,the finite element technique is *** ranges of the characteristics are as follows:the Rayleigh number(10^3≤Ra≤10^5),the Hartmann number(0≤Ha≤100),the nanoparticle hybrid concentration(ϕAl2O3,ϕcu=0,0.025,0.05),the magnetic field orientation(0≤γ≤2π),and the Prandtl number Pr,the amplitude of wavy cavity A,and the number of waviness n are fixed at Pr=7,A=0.1,and n=3,*** comparison with a reported finding in the open literature is done,and the data are observed to be in very good *** effects of the governing parameters on the energy transport and fluid flow parameters are *** results prove that the increment of the magnetic influence determines the decrease of the energy transference because the conduction motion dominates the fluid *** the Rayleigh number is raised,the Nusselt number is increased,*** moderate Rayleigh numbers,the maximum ratio of the heat transfer takes place for the hybrid nanofluid and then the cu-nanofluid,followed by the *** nature of motion and energy transport parameters has been scrutinized.

关键词： magnetohydrodynamics natural convection hybrid nanofluid heat transfer bottom heater wavy top and bottom enclosure

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Oxidation of propane over ammonium-transition metal mixed keggin phosphomolybdate salts

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Journal of Natural Gas chemistry 2010年第1期19卷 54-60页

作者： t. Mazari c. Roch. Marchal S. Hocine N. Salhi c. Rabia Laboratoire de chimie du Gaz Naturel Faculte' de Chimie Universite' des Sciences et de la Technologie Houari Boumedie`ne USTHB BP32 El-Alia Bab-Ezzouar Alger Alge'rie ILV-UMR 8180 cNRS Universite' de Versailles -St Quentin-en-Yvelines Ba?timent Lavoisier 45 avenue des Etats-Unis 78035 Versailles Cedex France

Mixed ammonium-transition metal salts with formula of （NH4）xMyHzPMo12O40 （M = Ni^2＋, co^2＋ or Fe ^3＋） denoted as MPMo12 have been investigated for the oxidation of propane, with molecular oxygen, at temperature range between 380 ℃ and 420 ℃ after in-situ pre-treatment performed at two heating rate of 5 or 9℃/min. they were characterized by BEt method, XRD, UV-Vis and IR techniques. the catalysts were found to be active in the propane oxidation and selective to propene or acrolein, in particular for samples pre-treated with the heating rate of 9℃/min. FePMo12 was found to be a more active catalyst for propene （17.2% yield） with minimal over deep oxidation （0.3% yield in cOx）.

关键词： phosphomolybdate ammonium keggin propane oxidation propene acrolein

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Bilateral scleromalacia perforans and peripheral corneal thinning in Wegener's granulomatosis

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International Journal of Ophthalmology(English edition) 2011年第4期4卷 439-442页

作者： S c Reddy I tajunisah t Rohana Department of Ophthalmology Faculty of Medicine University of Malaya

A rare case of bilateral scleromalacia perforans, bilateral peripheral corneal thinning (contact lens cornea) and unilateral orbital inflammatory disease in a 50 year old female patient with an indolent form Wegener's granulomatosis(WG) involving lungs and sinuses is reported. the patient survived for 12 years after the initial diagnosis of systemic disease. there was perforation of left globe following trauma and no perforation of the right globe till the last follow up of the patient.

关键词： Wegener's granulomatosis scleromalacia perforans peripheral thinning of cornea proptosis

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Real-time per-pixel focusing method for light field rendering

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computational Visual Media 2021年第3期7卷 319-333页

作者： t.chlubna t.Milet P.Zemcík Faculty of Information technology Brno University of Technology61200 BrnoCzech Republic

Light field rendering is an image-based rendering method that does not use 3 D models but only images of the scene as input to render new *** field approximation,represented as a set of images,suffers from so-called refocusing artifacts due to different depth values of the pixels in the *** information about depths in the scene,proper focusing of the light field scene is limited to a single focusing *** correct focusing method is addressed in this work and a real-time solution is proposed for focusing of light field scenes,based on statistical analysis of the pixel values contributing to the final *** existing techniques,this method does not need precomputed or acquired depth *** requirements and streaming bandwidth are reduced and real-time rendering is possible even for high resolution light field data,yielding visually satisfactory *** evaluation of the proposed method,implemented on a GPU,is presented in this paper.

关键词： image-based rendering light field plenoptic function computational photography

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Gaseous Nitrogen Losses from coastal Acid Sulfate Soils:A Short-term Study

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Pedosphere 2011年第2期21卷 197-206页

作者： B.c.t.MAcDONALD O.t.DENMEAD I.WHItE G.BYRANt cSIRO Land and Water CanberraACT 2601 (Australia) the Fenner School of Environment and Society Australian National UniversityCanberraACT 0200 (Australia) University of Wollongong WollongongNSW 2500 (Australia)

NOx and N2O emissions from coastal acid sulfate soils （cASS） cultivated for sugarcane production were investigated on the coastal lowlands of northern New South Wales, Australia. two series of short-term measurements were made using chambers and micrometeorological techniques. Series i occurred during the wet season, the water-filled pore space （WFPS） was between 60%-80% and the site flooded during the measurements. Measurements were made directly after the harvest of soybean crop, which fixed an estimated 100 kg N ha-1, and the emission amounted to 3.2 kg NOx-N ha-1 （12 d） and 1.8 kg N20-N ha-1 （5 d）. Series 2 was made towards the end of the dry season when the WFPS was less than 60%. In Series 2-1 after an application of 50 kg N ha-1, emissions were markedly less, amounting to 0.9 kg N ha 1 over 10 d. During both series when the soil was moist, emissions of NOx were larger than those of N2O. the emission of NOx appeared to be haphazard, with little time dependence, but there was a clear diurnal cycle for N2O, emphasising the need for continuous measurement procedures for both gases. these results suggest that agricultural production on cASS could be important sources of greenhouse gases and nitrogen practices will need to be optimised to reduce the offsite effects of atmospheric warming, acidification or nitrification. Many questions still remain unanswered such as the emissions during the soybean bean filling stage and crop residue decomposition, the longer-term losses following the fertiliser application and emissions from cASS under different land uses.

关键词： denitrification greenhouse gases nitrification nitrogen oxides nitrous oxide

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Multiresidue pesticide analysis in tomato using Gc-MS/MS using modified QuEchERS method with titanium-coated graphite with cNt-ABS nanocomposite as dispersive solid-phase extraction materials

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Food Quality and Safety 2022年第4期6卷 608-618页

作者： Mahadev c.Khetagoudar G.t.Deepa P.t.Goroji Mahadev B.chetti Avvaru Praveen Kumar Dinesh c.Bilehal University of Agricultural Sciences DharwadKarnatakaIndia Department of Applied chemistry School of Applied Natural ScienceAdama Science and Technology UniversityAdamaEthiopia Department of chemistry Karnatak UniversityDharwadKarnatakaIndia

the presence of pesticide residues in food and vegetables is a growing concern for *** monitor these residues reliably,a selective and sensitive multiresidue system has been developed and validated in tomato by gas chromatography–tandem mass spectrometry(Gc-MS/MS).titanium-coated graphite with carbon nanotube(cNt)in acrylonitrile–butadiene–styrene(ABS)used as reversed-dispersive solid-phase extraction materials with modified QuEchERS(Quick,Easy,cheap,Effective,Rugged,and Safe)***-coated graphite with cNt-ABS is synthesized,characterized by X-ray diffraction and scanning electron *** clean-up performance of titanium-coated graphite with cNt-ABS was demonstrated to be better to primary secondary amine and graphitized carbon black *** processing of two multiple reaction monitoring transformations for each analyte is done using Gc-MS/MS in electron impact *** purification and recovery effects(74%–100%)of 35 pesticides were achieved in tomato matrices when using 5 mg of titanium-coated graphite ABS-cNt *** was observed that quinolphos and deltamethrin are present above the maximum residue *** technique proved to be reliable and sensitive in tomato samples for the routine testing of 35 pesticides.

关键词： Gas chromatography-tandem mass spectrometry pesticide residue analysis multiple reaction monitoring QuEchERS titanium-coated graphite with cNt-ABS nanocomposite

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Effect of high anodic polarization on the passive layer properties of superduplex stainless steel friction stir welds at different chloride electrolyte pH values and temperatures

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International Journal of Minerals,Metallurgy and Materials 2019年第6期26卷 710-721页

作者： L.A.Santa-cruz G.Machado A.A.Vicente t.F.c.Hermenegildo t.F.A.Santos Department of Mechanical Engineering Universidade Federal de PernambucoAv.da Arquiteturas/n50740-550RecifePEBrazil center of Nanotechnology Centro de Tecnologias Estratégicas do NordesteCETENERecifePEBrazil Department of chemical Engineering Universidade de Sao PauloSao PauloSPBrazil

the conditions used for friction stir welding of duplex stainless steels determine the resulting mechanical and corrosion performance of the *** study investigates the corrosion resistance of UNS S32750 and S32760 superduplex stainless steels(SDSSs)joined by friction stir welding,employing cyclic polarization,Mott–Schottky,and microscopy techniques for *** microscopy images indicated the presence of a deleterious intermetallic phase after electrolytic etching of S32760,as well as decreased corrosion *** presence of molybdenum in the steels promoted better passive behavior at low *** Mott–Schottky curves revealed p-n heterojunction behavior of the passive *** acquired after the polarization test by scanning electron microscopy showed higher passivation propensity with increases of temperature and pH.

关键词： superduplex stainless steel friction stir welding corrosion resistance cyclic polarization Mott–Schottky

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A High-order coupled compact Integrated RBF Approximation Based Domain Decomposition Algorithm for Second-order Differential Problems

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computer Modeling in Engineering & Sciences 2015年第4期104卷 251-304页

作者： c.M.t.tien N.Pham-Sy N.Mai-Duy c.-D.tran t.tran-cong computational Engineering and Science Research centre Faculty of HealthEngineering and SciencesThe University of Southern QueenslandToowoombaQueensland 4350Australia

this paper presents a high-order coupled compact integrated RBF(cc IRBF)approximation based domain decomposition(DD)algorithm for the discretisation of second-order differential *** Schwarz DD algorithms,including one-level additive/multiplicative and two-level additive/multiplicative/hybrid,are *** ccIRBF based DD algorithms are analysed with different mesh sizes,numbers of subdomains and overlap sizes for Poisson *** convergence analysis shows that the ccIRBF two-level multiplicative version is the most effective algorithm among various schemes employed ***,the present ccIRBF two-level method converges quite rapidly even when the domain is divided into many subdomains,which shows great promise for either serial or parallel *** practical tests,we then incorporate the ccIRBF into serial and parallel two-level multiplicative *** numerical examples,including those governed by Poisson and Navier-Stokes equations are analysed to demonstrate the accuracy and efficiency of the serial and parallel algorithms implemented with the *** results show:(i)the ccIRBF-Serial and-Parallel algorithms have the capability to reach almost the same solution accuracy level of the ccIRBF-Single domain,which is ideal in terms of computational calculations;(ii)the ccIRBF-Serial and-Parallel algorithms are highly accurate in comparison with standard finite difference,compact finite difference and some other schemes;(iii)the proposed ccIRBF-Serial and-Parallel algorithms may be used as alternatives to solve large-size problems which the ccIRBF-Single domain may not be able to deal *** ability of producing stable and highly accurate results of the proposed serial and parallel schemes is believed to be the contribution of the coarse mesh of the two-level domain decomposition and the ccIRBF *** is noted that the focus of this paper is on the derivation of highly accurate serial and parallel algorithms

关键词： coupled compact integrated RBF (ccIRBF) Schwarz domain decomposition one-level two-level coarse meshes additive multiplicative hybrid serial parallel colouring technique Poisson equation Naiver-Stokes equation liddriven cavity

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characteristic Study of the Boundary Layer Parameters over the Arabian Sea and the Bay of Bengal Using the QuikScAt Dataset

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Advances in Atmospheric Sciences 2007年第4期24卷 631-643页

作者： V.HAMZA c.A.BABU t.P.SABIN Department of Atmospheric Sciences Cochin University of Science and TechnologyCochin-682 016India

the marine atmospheric boundary layer （MABL） plays a vital role in the transport of momentum and heat from the surface of the ocean into the atmosphere. A detailed study on the MABL characteristics was carried out using high-resolution surface-wind data as measured by the QuikScAt （Quick scatterometer） satellite. Spatial variations in the surface wind, frictional velocity, roughness parameter and drag coefficient for the different seasons were studied. the surface wind was strong during the southwest monsoon season due to the modulation induced by the Low Level Jetstream. the drag coefficient was larger during this season, due to the strong winds and was lower during the winter months. the spatial variations in the frictional velocity over the seas was small during the post-monsoon season （-0.2 m s^-1）. the maximum spatial variation in the frictional velocity was found over the south Arabian Sea （0.3 to 0.5 m s^-1） during the southwest monsoon period, followed by the pre-monsoon over the Bay of Bengal （0.1 to 0.25 m s^-1）. the mean wind-stress curl during the winter was positive over the equatorial region, with a maximum value of 1.5×10^-7 N m^-3, but on either side of the equatorial belt, a negative wind-stress curl dominated. the area average of the frictional velocity and drag coefficient over the Arabian Sea and Bay of Bengal were also studied. the values of frictional velocity shows a variability that is similar to the intraseasonal oscillation （ISO） and this was confirmed via wavelet analysis. In the case of the drag coefficient, the prominent oscillations were ISO and quasi-biweekly mode （QBM）. the interrelationship between the drag coefficient and the frictional velocity with wind speed in both the Arabian Sea and the Bay of Bengal was also studied.

关键词： boundary layer characteristics drag coefficient frictional velocity roughness length QuikScAt wind

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thermal degradation characteristics and products obtained after pyrolysis of specific polymers found in Waste Electrical and Electronic Equipment

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Frontiers of Environmental Science & Engineering 2017年第5期11卷 97-106页

作者： Evangelia c. Vouvoudi Aristea t. Rousi Dimitris S. Achilias Laboratory of chemistry and technology of Polymers and Dyes Department of Chemistry Aristotle University of Thessaloniki Thessaloniki GR-54 124 Greece

Modem societies strongly support the recycling practices over simple waste accumulation due to environmental harm caused. In the framework of sustainable recycling of plastics from WEEE, pyrolysis is proposed here as a means of obtaining secondary value-added products. the aim of this study was to investigate the thermal degradation and the products obtained after pyrolysis of specific polymers found in the plastic part of WEEE, using thermogravimetric analysis and a pyrolizer equipped with a Gc/MS. Polymers studied include ABS, HIPS, Pc and a blend having a composition similar to that appearing in WEEE. It was found that, Pc shows greater heat endurance compared to the other polymers, whereas ABS depolymerizes in three-steps. the existence of several polymers in the blend results in synergistic effects which decrease the onset and final temperature of degradation. Moreover, the fragmentation occurred in the pyrolyzer, at certain temperatures, resulted in a great variety of compounds, depending on the polymer type, such as monomers, aromatic products, pnenoJlc compounds and hydrocarbons. the main conclusion from this investigation is that pyrolysis could be an effective method for the sustainable recycling of the plastic part of WEEE resulting in a mixture of chemicals with varying composition but being excellent to be used as fuel retrieved from secondary recycling sources.

关键词： Pyrolysis WEEE recycling ABS HIPSPc Py-Gc/MS tGA

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