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Geospa.ia. Ma.ping of Soil Nitra.e-Nitrogen d.stribution Und.r a.Mixed.La.d.Use System

Ped.sphere 2009年第4期19卷 434-445页

作者： S. La.Sa. C. M. BLISS d. a. graetz School of Forest Resources a.d.Conserva.ion University of Florida USd. Forest Service Southern Research Station Soil a.d.Wa.er Science d.pa.tment University of Florida

Ma.ping the spa.ia. d.stribution of soil nitra.e-nitrogen （NO3=N） is importa.t to guid. nitrogen a.plica.ion a. well a. to a.sess environmenta. risk of NO3-N lea.hing into the ground.a.er. We employed.univa.ia.e a.d.hybrid.geosta.istica. method. to ma. the spa.ia. d.stribution of soil NO3-N a.ross a.la.d.ca.e in northea.t Florid.. Soil sa.ples were collected.from four d.pth increments （0-30, 30-60, 60-120 a.d.120-180 cm） from 147 sa.pling loca.ions id.ntified.using a.stra.ified.ra.d.m a.d.nested.sa.pling d.sign ba.ed.on soil, la.d.use a.d.eleva.ion stra.a. Soil NO3-N d.stributions in the top two la.ers were spa.ia.ly a.tocorrela.ed.a.d.ma.ped.using lognorma. kriging. Environmenta. correla.ion mod.ls for NO3-N pred.ction were d.rived.using linea. a.d.non-linea. regression method., a.d.employed.to d.velop NO3-N trend.ma.s. La.d.use a.d.its rela.ed.va.ia.les d.rived.from sa.ellite ima.ery were id.ntified.a. importa.t va.ia.les to pred.ct NO3-N using environmenta. correla.ion mod.ls. While lognorma. kriging prod.ced.smoothly va.ying ma.s, trend.ma.s d.rived.from environmenta. correla.ion mod.ls genera.ed.spa.ia.ly heterogeneous ma.s. Trend.ma.s were combined.with ord.na.y kriging pred.ctions of trend.mod.l resid.a.s to d.velop regression kriging pred.ction ma.s, which ga.e the best NO3-N pred.ctions. a. la.d.use a.d.remotely sensed.d.ta.a.e rea.0}ly a.a.la.le a.d.ha.e much finer spa.ia. resolution compa.ed.to field.sa.pled.soils, our find.ngs suggested.the effica.y of environmenta. correla.ion mod.ls ba.ed.on la.d.use a.d.remotely sensed.d.ta.for la.d.ca.e sca.e ma.ping of soil NO3-N. The method.logies implemented.a.e tra.sfera.le for ma.ping of soil NO3-N in other la.d.ca.es.

关键词： environmenta. correla.ion genera. linea. mod.l kriging la.d.use regression

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Solutions to the Mod.fied.Poschl-Teller Potentia. in d.d.mensions

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Chinese Physics Letters 2010年第4期27卷 9-12页

作者： d. a.boola d.pa.tment of Pure a.d.a.plied.Ma.hema.ics Ladoke Atdntola University of Technology Oyo State P.M.B. 4000 Nigeria

a. a.proxima.e solution of the d.d.mensiona. Schrod.nger equa.ion with the mod.fied.Posehl-Teller potentia. is obta.ned.with a. a.proxima.ion of the centrifuga. term. Solution to the correspond.ng hyper-ra.0}a. equa.ion is given using the conventiona. Nikiforov-Uva.ov method. The norma.iza.ion consta.ts for the Poschl-Teller potentia. a.e a.so computed. The expecta.ion va.ues of 〈r^-2 a.d.〈V（r）〉 a.e a.so obta.ned.using the Feynma.- Hellma.n theorem.

关键词： Solutions Solutes Uses Centrifuging

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a.NUMERICa. METHOd.FOR THE SIMULa.ION OF FREE SURFa.E FLOWS OF VISCOPLa.TIC FLUId.IN 3d

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Journa. of Computa.iona. Ma.hema.ics 2011年第6期29卷 605-622页

作者： Kirill d. Nikitin Ma.im a. Olsha.skii Kirill M. Terekhov Yuri V. Va.silevski Institute of Numerica. Ma.hema.ics Russian Academy of Sciences Moscow Russia d.pa.tment of Mecha.ics a.d.Ma.hema.ics Moscow State University Moscow Russia

In this pa.er we stud. a.numerica. method.for the simula.ion of free surfa.e flows of viscopla.tic （Herschel-Bulkley） fluid.. The a.proa.h is ba.ed.on the level set method.for ca.turing the free surfa.e evolution a.d.on loca.ly refined.a.d.d.na.ica.ly a.0}pted.octree ca.tesia. sta.gered.grid. for the d.scretiza.ion of fluid.a.d.level set equa.ions. a.regu- la.ized.mod.l is a.plied.to ha.d.e the non-d.fferentia.ility of the constitutive rela.ions. We consid.r a. extension of the sta.le a.proxima.ion of the Newtonia. flow equa.ions on sta.gered.grid.to a.proxima.e the viscopla.tic mod.l a.d.level-set equa.ions if the free bound.ry evolves a.d.the mesh is d.na.ica.ly refined.or coa.sened. The numerica. method.is first va.id.ted.for a.Newtonia. ca.e. In this ca.e, the convergence of numerica. solutions is observed.towa.d. experimenta. d.ta.when the mesh is refined. Further we compute severa. 3d.viscopla.tic Herschel-Bulkley fluid.flows over incline pla.es for the d.m-brea. problem. The qua.ita.ive compa.ison of numerica. solutions is d.ne versus experimenta. investiga.ions. a.other numerica. exa.ple is given by computing the freely oscilla.ing viscopla.tic d.oplet, where the motion of fluid.is d.iven by the surfa.e tension forces. a.together the consid.red.techniques a.d.a.gorithms （the level-set method. compa.t d.scretiza.ions on d.na.ica.ly a.0}pted.octree ca.tesia. grid., regula.iza.ion, a.d.the surfa.e tension forces a.proxima.ion） result in efficient a.proa.h to mod.ling viscopla.tic free-surfa.e flows in possibly complex 3d.geometries.

关键词： Free surfa.e flows Viscopla.tic fluid a.0}ptive mesh refinement Oetree meshes.

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a. inva.ia.t d.scriptor for conjuga.e forced.convection-cond.ction cooling of 3d.protrud.ng hea.ers in cha.nel flow

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Frontiers of Mecha.ica. Engineering 2015年第3期10卷 263-276页

作者： Thia.o a.TONINI a.VES Pa.lo H. d. Sa.TOS Murilo a. Ba.BUR d.pa.tment of Mecha.ica. Engineering Federal University ofTechnology Parana Brazil

In this resea.ch, the tempera.ures of three- d.mensiona. （3d. protrud.ng hea.ers mounted.on a.cond.ctive substra.e in a.horizonta. recta.gula. cha.nel with la.ina. a.rflow a.e rela.ed.to the ind.pend.nt power d.ssipa.ion in ea.h hea.er by using a.ma.rix G＋ with inva.ia.t coefficients, which a.e d.mensionless. These coefficients a.e d.fined.in this stud. a. the conjuga.e influence coefficients （g＋） ca.sed.by the forced.convec- tion-cond.ction na.ure of the hea.ers＇ cooling process. The tempera.ure increa.e of ea.h hea.er in the cha.nel is qua.tified.to clea.ly id.ntify the contributions a.tributed.to the self-hea.ing a.d.power d.ssipa.ion in the other hea.ers （both upstrea. a.d.d.wnstrea.）. The conjuga.e coefficients a.e inva.ia.t with the hea. genera.ion ra.e in the a.ra. of hea.ers when a.suming a.d.fined.geometry, inva.ia.le fluid.a.d.flow ra.e, a.d.consta.t substra.e a.d.hea.er cond.ctivities. The results a.e numerica.ly obta.ned.by consid.ring three 3d.protrud.ng hea.ers on a.twod.mensiona. （2d. a.ra. by a.SYS/FluentTM 15.0 softwa.e. The conserva.ion equa.ions a.e solved.by a.coupled.proced.re within a.single ca.cula.ion d.ma.n comprising of solid.a.d.fluid.regions a.d.by consid.ring a.stea.0} sta.e la.ina. a.rflow with consta.t properties. Some exa.ples a.e shown, ind.ca.ing the effects of substra.e therma. cond.ctivity a.d.Reynold. number on conjuga.e influence coefficients.

关键词： cha.nel flow conjuga.e forced.convection-cond.ction cooling conjuga.e influence coefficients d.s-crete hea.ing inva.ia.t d.scriptor therma. ma.a.ement

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Tribologica. Properties of a.56.2/RHa.Composites

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Journa. of Ma.eria.s Science & Technology 2012年第4期28卷 367-372页

作者： d. Siva.Pra.a.0}a. Ra.a.Krishna d.pa.tment of Mecha.ica. Engineering GITAM University Visakhapatnam Andhra Pradesh India d.pa.tment of Mecha.ica. Engineering ANDHRA University Visakhapatnam Andhra Pradesh India

Rice husk a.h （RHa. is one of the ind.stria. wa.te byprod.ct a.a.la.le a.und.ntly in the world. In the present work, a. a.tempt is ma.0} to incorpora.e the RHa.pa.ticles in the molten a.uminum a.56,2 a.loy. The RHa.pa.ticles were a.0}ed.into the ma.rix melt by crea.ing a.vortex with the help of a.mecha.ica. stirrer a.d.the melt tempera.ure wa. ma.nta.ned.between 800 a.d.850 ℃. d.y slid.ng wea. experiments were performed.in a.pin on d.sc wea. equipment a.a.nst a.chromium steel d.sc a. 30 ℃. Sca.ning electron microscopy is used.to stud. the wea. cha.a.teristics of the unreinforced.a. a.loy a.d.the a.56.2/RHa.composites. From the experiments it is observed.tha. the composites exhibit higher ha.d.ess a.d.resista.ce to wea. a. compa.ed.to unreinforced.a. a.loy,

关键词： Rice husk a.h a.56.2 a.uminum a.loy Wea.

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ESTIMa.ING CROSS-TRa.NING Ca.L CENTER Ca.a.ITY THROUGH SIMULa.ION

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Journa. of Systems Science a.d.Systems Engineering 2016年第4期25卷 448-468页

作者： d.vid.a. Munoz Na.ha.iel d. Ba.tia. d.pa.tment of Ind.stria. a.d.Ma.ufa.turing Engineering The Pennsylvania State University

Ca.l centers ha.e grown world.wid. d.ring the pa.t d.ca.0}. One of the most importa.t a.pects consid.red.by ca.l center ma.a.ers is the optimiza.ion of its opera.ors, which implies covering the highly va.ia.le d.ma.d.a.d.f＇md.ng a. efficient wa. to a.sign people to certa.n shifts in ord.r to a.hieve a.d.sira.le service level a.d.a.a.d.nment ra.e. a.other cha.lenge is d.termining which system setup is a.propria.e for the specific ca.l center. Should.we ha.e a.single-skill ca.l center or multi-skill ca.l center？ If we d. ha.e the la.ter, how ma.y multi-skill a.ents should.we ha.e on sta.f？. In this ca.e stud., we genera.e a.d.a.a.yze d.screte-event systems simula.ion-optimiza.ion mod.ls to test the beha.ior of a.rea.-world.ca.l center und.r the a.tua. configura.ion a.d.und.r d.fferent levels of cross-tra.ning. The mod.l results help ca.l center ma.a.ers by： 1） d.termining the optima. number of opera.ors need.d.for d.fferent sta.f configtma.ions in ord.r to a.hieve the ta.gets for service level a.d.a.a.d.nment; 2） provid.ng informa.ion a.out the tra.0}-off between the key mea.urements in the ca.l center; a.d.3） provid.ng useful informa.ion a.out the number of opera.ors need.d.a.d.used.for ea.h hour of opera.ion to estima.e the number of four-hour shifts required.to a.hieve the performa.ce ta.gets. Our experimenta. f＇md.ngs from this ca.e stud. suggest tha. a.bi-skill ca.l center is economica.ly better in the long-rtm compa.ed.to a.full-skill or single-skill ca.l center. This ca.e stud. a.gments the ca.l center bod. of knowled.e by provid.ng a.0}itiona. ma.a.eria. insights for the opera.ions ma.a.ement community.

关键词： Ca.l centers cross-tra.ning d.screte-event systems simula.ion simula.ion optimiza.ion service opera.ions service systems

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d.rect-forcing immersed.bound.ry la.tice Boltzma.n simula.ion of pa.ticle/fluid.intera.tions for spherica. a.d.non-spherica. pa.ticles

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Pa.ticuology 2016年第2期14卷 93-103页

作者： a. Eshghineja.0}a.d.a. a.d.lsa.ie G. Ja.iga.d. Thevenin La.ora.ory of Fluid.d.na.ics a.d.Technica. Flows University of Magdeburg "Otto yon Guericke" Universitatsplatz 2 39106 Magdeburg Germany

The la.tice Boltzma.n method.（LBM） is a.useful technique for simula.ing multipha.e flows a.d.mod.ling complex physics. Specifica.ly, we use LBM combined.with a.d.rect-forcing （d.） immersed.bound.ry （IB） method.to simula.e fluid.pa.ticle intera.tions in two-pha.e pa.ticula.e flows. Two grid. a.e used.in the simula.ion： a.fixed.uniform Euleria. grid.for the fluid.pha.e a.d.a.La.ra.gia. grid.tha. is a.ta.hed.to a.d.moves with the immersed.pa.ticles. Forces a.e ca.cula.ed.a. ea.h La.ra.gia. point. To excha.ge numerica. informa.ion between the two grid., d.screte d.lta.functions a.e used. The resulting d. IB-LBM a.proa.h is then successfully a.plied.to a.va.iety of reference flows, na.ely the sed.menta.ion of one a.d.two circula. pa.ticles in a.vertica. cha.nel, the sed.menta.ion of one or two spheres in a. enclosure, a.d.a.neutra.ly buoya.t prola.e spheroid.in a.Couette flow. This la.t a.plica.ion proves tha. the d.veloped.a.proa.h ca. be used.a.so for non-spherica. pa.ticles. The three forcing schemes a.d.the d.fferent fa.tors a.fecting the simula.ion （a.0}ed.ma.s effect, corrected.ra.0}us） a.e a.so d.scussed.

关键词： Immersed.bound.ry method.La.tice Boltzma.n Pa.ticula.e flow Forcing method

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Ga. d.na.ic control of properties of weld.d.joints from high strength a.loyed.steels

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China.Weld.ng 2014年第3期23卷 26-30页

作者： d. a. China.hov Yurga.Institute of Technology Tomsk Polytechnic University 652055 Russia Kemerovo region

Ga. d.na.ic control in weld.ng with consuma.le electrod. in cond.tions of two-jet ga. shield.ng a.d.its impa.t on the processes in the weld.ng a.ea.a.d.properties of the weld.d.joints from high strength a.loyed.steel 30HGSa.is consid.red.in the pa.er. The results of a.compa.a.ive experimenta. stud. of controlling the properties of weld.d.joints by cha.ging the ga. d.na.ics of the a.tive shield.ng ga. a.e given. The impa.t force of a.shield.ng ga. jet on the d.op of the electrod. meta. is 12 times higher in cond.tions of two-jet ga. shield.ng tha. in those of single jet shield.ng. It is found.tha. ga. d.na.ics of the a.tive shield.ng ga. jet d.termines the forma.ion of the weld.d.joints, their chemica. properties a.d.the properties of the weld.d.joints from high strength a.loyed.steels. The consuma.le electrod. weld.ng method.with two-jet ga. shield.ng provid.s controlled.d.na.ics in the weld.ng a.ea.a.d.a.lows controlling the tra.sfer of the electrod. meta., chemica. composition of the weld. sta.ilizing the weld.ng process, it ensures higher mecha.ica. properties of the weld.d.joints.

关键词： weld.ng ga. d.na.ic control shield.ng ga. properties weld.d.joint a.loyed.steel

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La.er Pola.iza.ion Orienta.ions in(e,2e)Rea.tions in a.oms

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Chinese Physics Letters 2015年第8期32卷 62-65页

作者： a.a.a.I. Ma.houte a. Kha.il d. UFR d. Physique d. Ra.onnement et d.s Intera.tions La.er-Ma.ière Faculté des SciencesUniversité Moulay Ismail

Second.ord.r Born ca.cula.ions a.e performed.to investiga.e the triple d.fferentia. cross sections of copla.a. a.ymmetric la.er-a.sisted.（e, 2e） collisions for hyd.ogen a.d.helium ta.gets. The incid.nt electron is consid.red.to be d.essed.by the la.er field.in a.nonperturba.ive ma.ner by choosing the Volkov solutions in both the initia. a.d.fina. cha.nels. d.ta.led.ca.cula.ions of the sca.tering a.plitud.s a.e performed.using the Sturmia. ba.is expa.sion. The sta.e of the ejected.electron is d.scribed.by a.Coulomb-Volkov wa.e function. Two geometries a.e investiga.ed.in which the la.er pola.iza.ion vector is either pa.a.lel to the incid.nt momentum of the projectile or pa.a.lel to the momentum tra.sfer. Our numerica. results show tha., in the low energy ra.ge, these two la.er pola.iza.ion orienta.ions give the sa.e sha.e a.d.the sa.e ord.r of ma.nitud. of la.er-a.sisted.ioniza.ion cross sections of helium a.d.hyd.ogen ta.gets.

关键词： La.er Pola.iza.ion Orienta.ions in e,2e)Rea.tions in a.oms

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Compa.a.ive a.a.ysis of Photo-Crysta.liza.ion in a.Se95Te5 a.d.a.Se95In5 a.loys

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Chinese Physics Letters 2006年第11期23卷 3061-3064页

作者： N. Mehta.d. Kuma. a. Kuma. d.pa.tment of Physics Pranveer Singh Institute of Technology Kanpur India d.pa.tment of Physics JSS Academy of Technical Education Noida India d.pa.tment of Physics Harcourt Butler Technological Institute Kanpur India

We report a.compa.a.ive stud. on photo-crysta.liza.ion in a.Se95 Te5 a.d.a.Se95In5 a.loys. The photo-crysta.liza.ion is a.hieved.by a.shining white line on the thin films of these a.loys in va.uum for d.fferent exposure times. The results ind.ca.e tha. photo-crysta.liza.ion is fa.t in a.Se95In5 a.loy a. compa.ed.to a.Se95 Te5 a.loy. This is expla.ned.in terms of lower therma. sta.ility of a.Se95In5 a.loy a. compa.ed.to a.Se95 Te5 a.loy.

关键词： a.ORPHOUS THIN-FILMS CHa.COGENId. GLa.SES TRa.SIENT PHOTOCONd.CTIVITY STEa.0}-STa.E SELENIUM KINETICS PHOTOCRYSTa.LIZa.ION TRa.SITION SEMICONd.CTORS SE100-XINX

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