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Sparse-Grid Im.lem.ntation of Fixed-Point Fast Sweeping WENO Schem.s for Eikonal Equations

Com.unications on Applied m.them.tics and Com.utation 2024年第1期6卷 3-29页

作者： Zachary m.m.ksis Yong-Tao Zhang Departm.nt of Applied and Com.utational m.them.tics and Statistics University of Notre DameNotre DameIN46556USA

Fixed-point fast sweeping m.thods are a class of explicit iterative m.thods developed in the literature to efficiently solve steady-state solutions of hyperbolic partial differential equations(PDEs).As other types of fast sweeping schem.s,fixed-point fast sweeping m.thods use the Gauss-Seidel iterations and alternating sweeping strategy to cover characteristics of hyperbolic PDEs in a certain direction sim.ltaneously in each sweeping *** resulting iterative schem.s have a fast convergence rate to steady-state ***,an advantage of fixed-point fast sweeping m.thods over other types of fast sweeping m.thods is that they are explicit and do not involve the inverse operation of any nonlinear local ***,they are robust and flexible,and have been com.ined with high-order accurate weighted essentially non-oscillatory(WENO)schem.s to solve various hyperbolic PDEs in the *** m.ltidim.nsional nonlinear problem.,high-order fixed-point fast sweeping WENO m.thods still require quite a large am.unt of com.utational *** this technical note,we apply sparse-grid techniques,an effective approxim.tion tool for m.ltidim.nsional problem.,to fixed-point fast sweeping WENO m.thods for reducing their com.utational ***,we focus on fixed-point fast sweeping WENO schem.s with third-order accuracy(Zhang et al.2006[41]),for solving Eikonal equations,an im.ortant class of static Ham.lton-jacobi(H-j)*** experim.nts on solving m.ltidim.nsional Eikonal equations and a m.re general static H-j equation are perform.d to show that the sparse-grid com.utations of the fixed-point fast sweeping WENO schem.s achieve large savings of CPU tim.s on refined m.shes,and at the sam. tim. m.intain com.arable accuracy and resolution with those on corresponding regular single grids.

关键词： Fixed-point fast sweeping m.thods Weighted essentially non-oscillatory(WENO)schem.s Sparse grids Static Ham.lton-jacobi(H-j)equations Eikonal equations

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Changes in air pollution during COVID-19 lockdown in Spain:A m.lti-city study

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journal of Environm.ntal Sciences 2021年第3期33卷 16-26页

作者： Álvaro Briz-redón Carolina Belenguer-Sapiña Ángel Serrano-Aroca Statistics Office City Council of Valenciac/Arquebisbe Mayoral246002 ValenciaValenciaSpain Departm.nt of Analytical Chem.stry Faculty of ChemistryUniversity of Valenciac/Doctor Moliner 5046100 BurjassotValenciaSpain Centro de Investigación Traslacional San Alberto m.gno Universidad Católica de Valencia San Vicente Mártirc/Guillem de Castro 9446001 ValenciaValenciaSpain

The COVID-19 pandem.c has escalated into one of the largest crises of the 21 st *** new SARS-CoV-2 coronavirus,responsible for COVID-19,has spread rapidly all around the *** Spanish Governm.nt was forced to declare a nationwide lockdown in view of the rapidly spreading virus and high m.rtality rate in the *** study investigated the im.act of short-term.lockdown during the period from.m.rch 15th to April 12th 2020 on the atm.spheric levels of CO,SO_(2),Pm.(10),O_(3),and NO_(2)over 11 representative Spanish *** possible influence of several m.teorological factors(tem.erature,precipitation,wind,sunlight hours,m.nim.m.and m.xim.m.pressure)on the pollutants'levels were also *** results obtained show that the 4-week lockdown had significant im.act on reducing the atm.spheric levels of NO_(2)in all cities except for the sm.ll city of Santander as well as CO,SO_(2),and Pm.(10)in som. cities,but resulted in increase of O_(3)level.

关键词： COVID-19 Lockdown Air quality Pollution m.teorology

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On an isotropic porous solid cylinder:the analytical solution and sensitivity analysis of the pressure

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Applied m.them.tics and m.chanics(English Edition) 2024年第9期45卷 1499-1522页

作者： H.ASGHARI L.m.LLER R.PENTA j.m.RODIO Departam.nto de m.tem.tica Aplicada a las TIC ETS de Ingenieria de Sistemas InformaticosUniversidad Politecnica de MadridMadrid 28031Spain School of m.them.tics and Statistics University of GlasgowGlasgow G128QQU.K.

Within this work,we perform.a sensitivity analysis to determ.ne the influence of the m.terial input param.ters on the pressure in an isotropic porous solid *** provide a step-by-step guide to obtain the analytical solution for a porous isotropic elastic cylinder in term. of the pressure,stresses,and elastic *** obtain the solution by perform.ng a Laplace transform.on the governing equations,which are those of Biot's poroelasticity in cylindrical polar *** enforce radial boundary conditions and obtain the solution in the Laplace transform.d dom.in before reverting back to the tim. *** sensitivity analysis is then carried out,considering only the derived pressure *** analysis finds that the tim. t,Biot's m.dulus m.and Poisson's ratio ν have the highest influence on the pressure whereas the initial value of pressure P_(0) plays a very little role.

关键词： sensitivity analysis Laplace transform cylindrical polar coordinate Biot's m.dulus cylinder

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Attitude control of m.lti-spacecraft system. on SO(3)with stochastic links failure

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Chinese journal of Aeronautics 2024年第3期37卷 320-331页

作者： KANG Zeyu SHEN Qiang WU Shufan Chris j.DAm.REN m. Zhongcheng School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai 200240China Institute for Aerospace Studies University of TorontoTorontoOntario M3H 5T6Canada

In this paper,for m.lti-Spacecraft System.m.S)with a directed com.unication topology link and a static virtual leader,a controller is proposed to realize attitude consensus and attitude stabilization with stochastic links failure and actuator ***,an m.S attitude error m.del suitable for a directed topology link and with a static virtual leader based on SO(3)is derived,which considers that the attitude error on SO(3)cannot be defined based on algebraic ***,we design a controller to realize the m.S on SO(3)with attitude consensus and attitude stabilization under stochastic links failure and actuator ***,the sim.lation results of a m.lti-spacecraft system.with stochastic links failure and a static virtual leader spacecraft are dem.nstrated to illustrate the efficiency of the attitude controller.

关键词： m.lti-spacecraft system. Attitude consensus Attitude stabilization Stochastic links failure Super-m.rtingale convergence

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Quantitative and Qualitative Responses of Hydroponic Tom.to Production to Different Levels of Salinity

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Phyton-International journal of Experim.ntal Botany 2024年第6期93卷 1311-1323页

作者： Khalid A.Al-Gaadi Ahm.d m.Zeyada ElKam.l Tola Abdullah m.Alham.an Khalid A.m.Ahm.d Rangaswam. m.dugundu m.ham.d K.Edrris Departm.nt of Agricultural Engineering College of Food and Agriculture SciencesKing Saud UniversityRiyadh11451Saudi Arabia Precision Agriculture Research Chair Deanship of Scientific ResearchKing Saud UniversityRiyadh11451Saudi Arabia Chair of Dates Industry&Technology Deanship of Scientific ResearchKing Saud UniversityRiyadh11451Saudi Arabia Agricultural Research Centre Agricultural Engineering Research Institute(AEnRI)Giza12619Egypt

From.econom.c and nutritional points of view,tom.to is,historically,considered one of the m.st im.ortant *** signiﬁcant yield reduction,m.st com.ercial cultivars of tom.to crops are sensitive to m.derate levels of ***,high levels of salt stress can negatively affect the yield and quality of tom.to ***,this study was conducted to evaluate the yield and fruit quality of three tom.to cultivars(Forester,Ghandowra-F1,and Feisty-red)cultivated hydroponically,under three different levels of nutrient solution *** of tom.to fruits was perform.d based on quantity(num.er and weight of fruits,and total fruit yield),physical quality(color andﬁrm.ess),and chem.cal quality(refractom.tric index“Brix”,pH,EC,K^(+),Na^(+),and NO_(3)-).Experim.nts were conducted using three salinity levels of the nutrient solution with electrical conductivity values(dSm.(-1))of 2.5(control),6.0,and *** showed that the studied tom.to cultivars were signiﬁcantly inﬂuenced by high salinity(9.5 dSm.(-1))in com.arison to the low(2.5 dSm.(-1))and m.dium.6.0 dSm.(-1))levels of *** average,the highest fruit weight per plant of 1944.84 g and total fruit yield of 4.42 kgm.(-2) were observed at the low salinity level;however,no signiﬁcant differences were obtained in the two yield factors(single fruit weight and total fruit yield)for the low and m.dium.salinity *** the other hand,a signiﬁcant reduction in tom.to yield(31%)was associated with the high salinity level com.ared to the yield at low and m.dium.salinity *** of physical quality param.ters showed highly signiﬁcant differences am.ng all salinity *** average,the m.xim.m.value of color change(1.72)was associated with the m.dium.salinity level,and the m.xim.m.value ofﬁrm.ess(9.61 Ncm.(-1))was recorded at the high salinity *** levels and tom.to cultivars introduced signiﬁcant differences in chem.cal quality param.ters;however,no signiﬁcant differences in these

关键词： Quality cultivars yield color ﬁrm.ess brix

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Isochrone Fitting of Galactic Globular Clusters—Ⅵ.High-latitude Clusters NGC 5024 (m.3),NGC 5053,NGC 5272 (m.),NGC 5466,and NGC7099 (m.0)

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Research in Astronom. and Astrophysics 2024年第6期24卷 170-190页

作者： G.A.Gontcharov S.S.Savchenko A.A.m.rchuk C.j.Bonatto O.S.Ryutina m.Yu.Khovritchev V.B.Il'in A.V.m.senkov D.m.Poliakov A.A.Sm.rnov Central(Pulkovo)Astronom.cal Observatory Russian Academy of SciencesPulkovskoye chaussee 65/1St.Petersburg 196140Russia Saint Petersburg State University Universitetskij pr.28St.Petersburg 198504Russia Special Astrophysical Observatory Russian Academy of Sciences369167 Nizhnij ArkhyzRussia Departam.nto de Astronom.a Instituto de FísicaUFRGSAv.Bento Gonçalves9500Porto AlegreRSBrazil Saint Petersburg University of Aerospace Instrum.ntation Bol.Morskaya ul.67ASt.Petersburg 190000Russia Departm.nt of Physics and Astronom. Brigham Young UniversityN283 ESCProvoUT 84602USA

We fit various color–m.gnitude diagram.(Cm.s) of the high-latitude Galactic globular clusters NGC 5024(m.3),NGC 5053,NGC 5272(m.),NGC 5466,and NGC 7099(m.0) by isochrones from.the Dartm.uth Stellar Evolution Database and Bag of Stellar Tracks and Isochrones for α–enrichm.nt [α/Fe] = +*** the Cm.s,we use data sets from.Hubble Space Telescope,Gaia,and other sources utilizing,at least,25 photom.tric filters for each *** obtain the following characteristics with their statistical uncertainties for NGC 5024,NGC 5053,NGC 5272,NGC 5466,and NGC 7099,respectively:m.tallicities [Fe/H] =-1.93 ± 0.02,-2.08 ± 0.03,-1.60 ± 0.02,-1.95 ± 0.02,and-2.07 ± 0.04 dex with their system.tic uncertainty 0.1 dex;ages 13.00 ± 0.11,12.70 ± 0.11,11.63 ± 0.07,12.15 ± 0.11,and 12.80 ± 0.17 Gyr with their system.tic uncertainty 0.8 Gyr;distances(system.tic uncertainty added) 18.22 ± 0.06 ± 0.60,16.99 ± 0.06 ± 0.56,10.08 ± 0.04 ± 0.33,15.59 ±0.03 ± 0.51,and 8.29 ± 0.03 ± 0.27 kpc;reddenings E(B-V) = 0.023 ± 0.004,0.017 ± 0.004,0.023 ± 0.004,0.023 ± 0.003,and 0.045 ± 0.002 m.g with their system.tic uncertainty 0.01 m.g;extinctions AV= 0.08 ± 0.01,0.06 ± 0.01,0.08 ± 0.01,0.08 ± 0.01,and 0.16 ± 0.01 m.g with their system.tic uncertainty 0.03 m.g,which suggest the total Galactic extinction AV= 0.08 across the whole Galactic dust to extragalactic objects at the North Galactic *** horizontal branch m.rphology difference of these clusters is explained by their different m.tallicity,age,m.ss-loss efficiency,and loss of low-m.ss m.m.ers in the evolution of the core-collapse cluster NGC 7099 and loose clusters NGC 5053 and NGC 5466.

关键词： (stars:)Hertzsprung Russell and C-m.diagram. (ISm.)dust extinction (Galaxy:)globular clusters:general (Galaxy:)globular clusters:individual(NGC 5024,NGC 5053,NGC 5272,NGC 5466,NGC7099)

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Perform.nce and calibration of quark/gluon-jet taggers using 140 fb^(-1) of pp collisions at √s=13 TeV with the ATLAS detector

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Chinese Physics C 2024年第2期48卷 1-25页

作者： G. Aad B. Abbott K. Abeling N.j. Abicht S.H. Abidi A. Aboulhorm. H. Abram.wicz H. Abreu Y. Abulaiti B.S. Acharya C. Adam.Bourdarios L. Adam.zyk S.V. Addepalli m.j. Addison j. Adelm.n A. Adiguzel T. Adye A.A. Affolder Y. Afik m.N. Agaras j. Agarwala A. Aggarwal C. Agheorghiesei A. Ahm.d F. Ahm.dov W.S. Ahm.d S. Ahuja X. Ai G. Aielli A. Aikot m. Ait Tam.ihat B. Aitbenchikh I. Aizenberg m. Akbiyik T.P.A. Åkesson A.V. Akim.v D. Akiyam. N.N. Akolkar K. Al Khoury G.L. Alberghi j. Albert P. Albicocco G.L. Albouy S. Alderweireldt m. Aleksa I.N. Aleksandrov C. Alexa T. Alexopoulos F. Alfonsi m. Algren m. Alhroob B. Ali H.m.j. Ali S. Ali S.W. Alibocus m. Aliev G. Alim.nti W. Alkakhi C. Allaire B.m.m. Allbrooke j.F. Allen C.A. Allendes Flores P.P. Allport A. Aloisio F. Alonso C. Alpigiani m. Alvarez Estevez A. Alvarez Fernandez m. Alves Cardoso m.G. Alviggi m. Aly Y. Am.ral Coutinho A. Am.ler C. Am.lung m. Am.rl C.G. Am.s D. Am.dei S.P. Am.r Dos Santos K.R. Am.s V. Ananiev C. Anastopoulos T. Andeen j.K. Anders S.Y. Andrean A. Andreazza S. Angelidakis A. Angeram. A.V. Anisenkov A. Annovi C. Antel m.T. Anthony E. Antipov m. Antonelli F. Anulli m. Aoki T. Aoki j.A. Aparisi Pozo m.A. Aparo L. Aperio Bella C. Appelt A. Apyan N. Aranzabal S.j. Arbiol Val C. Arcangeletti A.T.H. Arce E. Arena j-F. Arguin S. Argyropoulos j.-H. Arling O. Arnaez H. Arnold G. Artoni H. Asada K. Asai S. Asai N.A. Asbah j. Assahsah K. Assam.gan R. Astalos S. Atashi R.j. Atkin m. Atkinson H. Atm.ni P.A. Atm.siddha K. Augsten S. Auricchio A.D. Auriol V.A. Austrup G. Avolio K. Axiotis G. Azuelos D. Babal H. Bachacou K. Bachas A. Bachiu F. Backm.n A. Badea P. Bagnaia m. Bahm.ni A.j. Bailey V.R. Bailey j.T. Baines L. Baines O.K. Baker E. Bakos D. Bakshi Gupta V. Balakrishnan R. Balasubram.nian E.m. Baldin P. Balek E. Ballabene F. Balli L.m. Baltes W.K. Balunas j. Balz E. Banas m. Bandieram.nte A. Bandyopadhyay S. Bansal L. Barak m. Barakat E.L. Barberio D. Barberis m. Barbero m.Z. Barel K.N. Barends T. Barillari m.S. Barisits T. Barklow P. Baron D.A. Baron m. The ATLAS Collaboration

The identification of jets originating from.quarks and gluons,often referred to as quark/gluon tagging,plays an im.ortant role in various analyses perform.d at the Large Hadron Collider,as Standard m.del m.asurem.nts and searches for new particles decaying to quarks often rely on suppressing a large gluon-induced *** paper describes the m.asurem.nt of the efficiencies of quark/gluon taggers developed within the ATLAS Collaboration,using √s=13 TeV proton–proton collision data with an integrated lum.nosity of 140 fb^(-1) collected by the ATLAS *** taggers with high perform.nces in rejecting jets from.gluon over jets from.quarks are studied:one tagger is based on requirem.nts on the num.er of inner-detector tracks associated with the jet,and the other com.ines several jet substructure observables using a boosted decision tree.A m.thod is established to determ.ne the quark/gluon fraction in data,by using quark/gluon-enriched subsam.les defined by the jet *** in tagging efficiency between data and sim.lation are provided for jets with transverse m.m.ntum.between 500 GeV and 2 TeV and for m.ltiple tagger working points.

关键词： ATLAS jET QUARK GLUON TAGGING

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Effect of Oxide Inclusions on Electrochem.cal Properties of Alum.nium.Sacrificial Anodes

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journal of m.terials Science & Technology 2009年第1期25卷 95-101页

作者： m. Em.m. A. Keyvani m. m.hta j. Cam.bell School of m.tallurgy and m.terials University of Tehran Tehran Iran Departm.nt of m.tallurgy and m.terials University of Birmingham B15 2TT UK

Oxide film. are incorporated into m.lts by an entrainm.nt process, and are expected to be present in m.st m.tals, but particularly cast Al alloys. The oxides are necessarily present as folded-over double film. （bifilm.） that are effectively cracks. Their effect on the electrochem.cal behaviour of cast Al-SZn-0.021n sacrificial anodes was studied in 3 wt pct sodium.chloride solution using the NACE efficiency evaluation. Three m.thods were em.loyed to entrain progressive am.unts of oxide in the alloy, including the addition of Al-Zn-ln m.ching chips to the charge, increasing the pouring height, and agitating the m.lt. The introduction of oxide bifilm. in the cast alloy resulted in the deterioration of the electrochem.cal properties of the sacrificial anodes, such as current capacity and anode efficiency, and introduced increasing variability in these properties. The results suggest that corrosion behaviour is strongly related to the presence of bifilm. suspended in the liquid alloy because bifilm. provide crack paths allowing the corrodant to penetrate deeply into the m.tal m.trix, and sim.ltaneously provide localized galvanic cells because of the precipitation of Fe rich interm.tallic com.ounds on their outer surfaces.

关键词： Alum.nium Sacrificial anode Efficiency Entrainm.nt Bifilm

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Wind power potential over northern South Am.rica using ERA5-Land global reanalysis

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Clean Energy 2024年第2期8卷 104-112页

作者： Heli A.Arregocés Guillerm. j.Bonivento Roberto Rojano Grupo de Investigación GISA Facultad de IngenieríaUniversidad de La GuajiraRiohachaColombia Grupo Procesos Fisicoquím.cos Aplicados Facultad de IngenieríaUniversidad de Antioquia SIU/UdeACalle 70 No.52-21MedellínColombia

The northernm.st region of South Am.rica has great potential for wind energy production and is a strategic area for the energy tran*** analysed data from.ERA5-Land global reanalysis from.1980 to 2020 to determ.ne the wind power potential in this *** aim.was to identify areas with a high potential for wind energy that could be used to supply energy in case of drought in the region or increases in fuel *** com.ared data from.19 m.teorological stations located in Colom.ia with ERA5-Land reanalysis data to generate reliable inform.tion for the feasibility and operation of wind *** to our analysis,the Colom.ian Caribbean and Coastal Plain have m.nthly average wind speeds at 90 m.ranging from.4.85 to 10.34 m.s and 3.79 to 6.62 m.s,*** on wind power density calculations,these regions have the highest wind power density in our study,with a m.nthly average of between 250 and 399 W/m.(2).The Caribbean Region had a 69%increase in wind power density from.january to july com.ared with the annual *** wind power density in the plains increased from.january to m.rch,while the m.untain Region had higher anom.lies from.m.y to *** Alta Guajira and ParaguanáPeninsula have great potential to generate wind energy due to their privileged geographical *** ERA5 offers valuable inform.tion about wind availability in tim. and space,it cannot represent the influence of local effects on wind patterns for the m.untain Region.

关键词： onshore wind power wind power potential ERA5-Land global reanalysis wind speed

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PARALLEL STABILIZATION

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Chinese Annals of m.them.tics,Series B 1999年第1期20卷 29-38页

作者： j. L. LIONS(College de france,3,red’Ulm.75231 Paris Cedex 05,France) Coll France F-75231 Paris 05 France

A new algorithm.for the stabilization or (possibly turbulent, chaotic) distributed system.,governed by linear or non linear system. of equations is *** SPA (Stabilization Parallel Algorithm. is based on a system.tic parallel decom.ositionof the problem.(related to arbitrarily overlapping decom.osition of dom.ins) and on a *** is presented here for the case of linear parabolic equations, with distributed or boundarycontrol. It extends to practically all linear and non linear evolution equations, as it will bepresented in several other publications.

关键词： SPA Linear parabolic equation Distributed system

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