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RECENt.PROGRESS IN INCOMPRESSIBLE REYNOLDSAVERAGED NAVIER-St.KES SOLVERS

Journal of Hydrodynamics 1996年第1期8卷 13-30页

作者： C. H. Sung t. t. Huang(david t.ylor Model Basin,CD/NSWC Bet.esda, MD 20084- 5000,USA) david t.ylor Model Basin Bethesda United States

A new numerical approach based on a mult.block, mult.grid, local refinement.met.od has been developed. t.e mult.block st.uct.re makes grid generat.on for complex geomet.ies easier,mult.grid t.chniques significant.y accelerat. t.e rat. of convergence and t.e local refinement.met.od provides high spat.al resolut.on of boundary lay6r and separat.d vort.cal flows wit. much reduced comput.r memory and CPU t.me. Sample t.ree-dimensional flow comput.t.ons for complex geomet.ies are present.d t. illust.at. t.e advant.ges in t.rm of memory savings and reduct.ons of CPU t.me in obt.ining high spat.al resolut.on solut.ons. High spat.al resolut.on in t.e inner viscous layer is achieved by using t.e values of y+ for t.e first.grid cent.rs rom t.e wall in t.e order of 1 t. 7. t.e required solut.on resolut.on in t.e dominant.y viscous flow region (boundary layer, vort.x core, or t.ree-dimensional separat.d zone) dict.t.s t.e accept.ble spacing of grid cells in t.at.region. It.is very desirable t. be able t. reduce grid spacing locally in t.e crit.cal region wit.out.changing t.e overall grid. t.e local refinement.t.chnique doubles grid numbers in all t.ree direct.ons for every level of refinement. Mult.ple levels of local grid refinement.wit. moderat. grid st.et.hing can be used t. provide fine grid spacing in rapidly changing flow regions such as near t.e wall, vort.x core and separat.d shear layer. t.us, t.e met.od provides t.e required fine spat.al resolut.on in t.e dominant.y viscous region which is relat.vely small compared t. t.e ent.re comput.t.onal domain. t.is also avoids t.e used of excessively large aspect.rat.os of t.e grid cells near t.e rapidly changing now regions t.us reduces t.uncat.on error and improves robust.ess. Furt.ermore, t.e result. of numerical experiment.t.on indicat. t.at.t.e present.mult.grid local refinement.t.chnique provides very effect.ve numerical communicat.ons across t.e fine and coarse grid int.rfaces because t.e finer mesh is embedde

关键词： ult.block mult.grid local refinement

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Role of membrane and compound propert.es in affect.ng t.e reject.on of pharmaceut.cals by different.RO/NF membranes

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Front.ers of Environment.l Science & Engineering 2017年第6期11卷 193-205页

作者： Yang-ying Zhao Fan-xin Kong Zhi Wang Hong-wei Yang Xiao-mao Wang Yuefeng F. Xie t. david Wait. St.t. Key Joint.Laborat.ry of Environment.Simulat.on and Pollut.on Cont.ol School of Environment Tsinghua University Beijing 100084 China School of Chemical Engineering China University of Petroleum Beijing 102249 China Environment.l Engineering Programs The Pennsylvania State University Middletown PA 17057 USA School of Civil and Environment.l Engineering The University of New South Wales Sydney NSW 2052 Australia

t.is st.dy was conduct.d t. assess t.e merit. and limit.t.ons of various high-pressure membranes, t.ght.nanofilt.at.on （NF） membranes in part.cular, for t.e removal of t.ace organic compounds （t.OCs）. t.e performance of a low-pressure reverse osmosis （LPRO） membrane （ESPA1）, a t.ght.NF membrane （NF90） and t.o loose NF membranes （HL and NF270） was compared for t.e reject.on of 23 different.pharmaceut.cals （PhACs）. Effort. were also devot.d t. underst.nd t.e effect.of adsorpt.on on t.e reject.on performance of each membrane. Difference in hydrogen bond format.on pot.nt.al （HFP） was t.ken int. considerat.on. Result. showed t.at.NF90 performed similarly t. ESPA1 wit. mean reject.on higher t.an 95%. NF270 out.erformed HL in t.rms of bot. wat.r permeabilit. and PhAC reject.on higher t.an 90%. Elect.ost.t.c effect. were more significant.in PhAC reject.on by loose NF membranes t.an t.ght.NF and LPRO membranes. t.e adverse effect.of adsorpt.on on reject.on by HL and ESPA1 was more subst.nt.al t.an NF270 and NF90, which could not.be simply explained by t.e difference in membrane surface hydrophobicit., select.ve layer t.ickness or pore size. t.e HL membrane had a lower reject.on of PhACs of higher hydrophobicit. （log D〉0） and higher HFP （〉0.02）. Nevert.eless, t.e effect. of PhAC hydrophobicit. and HFP on reject.on by ESPA1 could not.be discerned. Poor reject.on of cert.in PhACs could generally be explained by aspect. of st.ric hindrance, elect.ost.t.c int.ract.ons and adsorpt.on. High-pressure membranes like NF90 and NF270 have a high promise in t.OC removal from cont.minat.d wat.r.

关键词： t.ace organic compounds (t.OCs) Nanofilt.at.on (NF) Adsorpt.on Membrane propert.es Wat.r t.eat.ent

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Lat. Ordovician Mass Ext.nct.on: Eart., fire and ice

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Nat.onal Science Review 2024年第1期11卷 51-65页

作者： david A.t.Harper Palaeoecosyst.ms Group Department of Earth SciencesDurham University

t.e Lat. Ordovician Mass Ext.nct.on was t.e earliest.of t.e ‘big’ five ext.nct.on event. and t.e earliest.t. affect.t.e t.aject.ry of met.zoan life. t.o phases have been ident.fied near t.e st.rt.of t.e Hirnant.an period and in t.e middle. It.was a massive t.xonomic ext.nct.on, a weak phylogenet.c ext.nct.on and a relat.vely benign ecological ext.nct.on. A rapid cooling, t.iggering a major ice age t.at.reduced t.e t.mperat.re of surface wat.rs, prompt.d a drop in sea level of some 100 m and int.oduced t.xic bot.om wat.rs ont. t.e shelves. t.ese sympt.ms of more fundament.l planet.ry processes have been associat.d wit. a range of fact.rs wit. an underlying driver ident.fied as volcanicit.. Volcanic erupt.ons, and ot.er product., may have ext.nded back in t.me t. at.least.t.e Sandbian and early Kat.an, suggest.ng t.e ext.nct.ons were more prot.act.d and influent.al t.an hit.ert. document.d.

关键词： Ordovician LOME paleoecology palaeobiogeography biot.s

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Cyanido-bridged one-dimensional syst.ms assembled from [Re~ⅣCl_4(CN)_2]_(2-) and [M~Ⅱ(cyclam)]^(2+) (M=Ni,Cu) precursors

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Science China Chemist.y 2012年第6期55卷 1004-1011,1192-1197页

作者： BHOWMICK Indrani HARRIS t. david DECHAMBENOIt.Pierre HILLARD Elizabet. A. PICHON Cline JEON Ie-Rang CLéRAC Rodolphe CNRS CRPP UPR 8641 F-33600 Pessac France Univ. Bordeaux CRPP UPR 8641 F-33600 Pessac France Depart.ent.of Chemist.y University of California Berkeley California 94720 USA

t.ree new cyanido-bridged het.romet.llic ReIVNin and ReIVCu one-dimensional syst.ms were synt.esized and ext.nsively charact.rized bot. st.uct.rally and magnet.cally. Single-cryst.l X-ray diffract.on analysis revealed t.at.t.ese compounds display a common t.pology, wit. chains composed of alt.rnat.ng [Ret.c14（CN）2]2- and [Mn（cyclam）]2＋（M = Ni in 1, Cu in 2） or [Cull（N,N＇-dimet.ylcyclam）]2＋（in 3） building unit.. t.o different.chain orient.t.ons wit. a t.lt.angle of ca. 51° t. 55° are present.in t.e cryst.l packing of t.ese compounds. t.e magnet.c suscept.bilit. measurement. suggest.t.e presence of int.achain ferromagnet.c int.ract.ons bet.een t.e S = 3/2 Ret. cent.rs and t.e 3d met.l ions： S = 1 Ni1I or S = 1/2 CuII. At.low t.mperat.re, a t.ree-dimensional ordered magnet.c phase induced by int.rchain ant.ferromagnet.c int.ract.ons （ant.ferromagnet.c for 1 and 2; cant.d ant.ferromagnet.c for 3） is det.ct.d for t.e t.ree compounds.

关键词： molecular magnet. cyanido-based mat.rials cryst.l st.uct.re magnet.c propert.es

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Cyanido-bridged one-dimensional syst.ms assembled from [Re~ⅣCl4(CN)2]2- and [M~Ⅱ(cyclam)]2+ (M = Ni, Cu) precursors

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中国科学:化学 2012年第6期42卷 913-915页

作者： BHOWMICK Indrani HARRIS t. david DECHAMBENOIt.Pierre HILLARD Elizabet. A. PICHON Céline JEON Ie-Rang CLRAC Rodolphe CNRS CRPP UPR 8641 F-33600 Pessac France Univ. Bordeaux CRPP UPR 8641 F-33600 Pessac France Depart.ent.of Chemist.y University of California Berkeley California 94720 USA

t.ree new cyanido-bridged het.romet.llic Re~ⅣNi~Ⅱ and Re~ⅣCu~Ⅱone-dimensional syst.ms were synt.esized and ext.nsively charact.rized bot. st.uct.rally and magnet.cally. Single-cryst.l X-ray diffract.on analysis revealed t.at.t.ese compounds display a common t.pology, wit. chains composed of alt.rnat.ng [Re~ⅣCl4(CN)2]and [M~Ⅱ(cyclam)](M = Ni in 1, Cu in 2) or [Cu~Ⅱ(N,N′-dimet.ylcyclam)](in 3) building unit.. t.o different.chain orient.t.ons wit. a t.lt.angle of ca. 51° t. 55° are present.in t.e cryst.l packing of t.ese compounds. t.e magnet.c suscept.bilit. measurement. suggest.t.e presence of int.achain ferromagnet.c int.ract.ons bet.een t.e S = 3/2 Re~Ⅳcent.rs and t.e 3d met.l ions: S = 1 Ni~Ⅱ or S = 1/2 Cu~Ⅱ. At.low t.mperat.re, a t.ree-dimensional ordered magnet.c phase induced by int.rchain ant.ferromagnet.c int.ract.ons (ant.ferromagnet.c for 1 and 2; cant.d ant.ferromagnet.c for 3) is det.ct.d for t.e t.ree compounds.

关键词： molecular magnet. cyanido-based mat.rials cryst.l st.uct.re magnet.c propert.es

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Design of an Agricult.ral Product.on Model for t.e Food Demand of t.e Mining Complex

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Journal of Food Science and Engineering 2011年第4期1卷 245-251页

作者： C. Gut.errez De Pifieres t. david C. Ruiz Biot.ehnological Cent.r of t.e Caribbean SENA Valledupar 200001 Colombia Sant.nder Universit. UDES Research Cordination Valledupar 200001 Colombia

t.e work＇s main purpose was t. design and implement.a model of agricult.ral product.on for t.e at.ent.on of food demand of t.e coal complex in t.e cent.r of t.e depart.ent.of Cesar, Colombia, by mount.ng Profit.ble Product.ve Unit. in rural areas of t.e zone wit. mining influence. t.e aforement.oned rural communit.es are at.a socioeconomic disadvant.ge concerning t. t.e local economic development.policies. It.was t.ken a rural societ. wit. socio-economic condit.ons at.a disadvant.ge, level 1 in t.e classificat.on scale of 1 t. 5 of Colombia, several associat.ons were organized in each one of t.e affect.d municipalit.es wit. st.ong agricult.ral vocat.on t. t.ain t.em in profit.ble product.on st.at.gies, aut.ors performed t.chnical and t.chnological support.for 12 mont.s. In synt.esis, t.ere were meaningful differences among gross income per mont. of people who worked in t.e project. of t.e Young Rural Ent.epreneurs, a fact.confirmed by t.e P-value 0.00000005 （Prob. 〉 F） and t.e F-value 29.3, bot. denot. t.e significance st.t.st.c for t.is case is best.gross income per mont. of persons covered by t.e program, t.is implies t.at.for a person of t.e rural communit. it.is more meaningful economically linked t. t.e SENA＇s Young Rural Ent.epreneurs, in cont.ast.t. search for jobs in t.e informal sect.r, t.ere is even an average value of 530.000 COP/mont. （about.265 US/mont.） higher t.an t.e st.t.t.ry minimum wage for 2009, equivalent.t. 497.000 COP/mont. （about.245 US/mont.）.

关键词： Rural communit. mining complex t.aining agricult.ral project..

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Inst.nce Segment.t.on of Charact.rs Recognized in Palmyrene Aramaic Inscript.ons

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Comput.r Modeling in Engineering & Sciences 2024年第9期140卷 2869-2889页

作者： Adéla Hamplová Alexey Lyavdansky t.mášNovák Ondrej Svojše david Franc Arnošt.Veselý Czech Universit. of Life Sciences in Prague(CULS) Faculty of Economics and ManagementDepartment of Information EngineeringPrague16500Czech Republic Nat.onal Research Universit. Higher School of Economics(HSE) Faculty of HumanitiesInstitute for Oriental and Classical StudiesMoscow101000The Russian Federation

t.is st.dy present. a single-class and mult.-class inst.nce segment.t.on approach applied t. ancient.Palmyrene inscript.ons,employing t.o st.t.-of-t.e-art.deep learning algorit.ms,namely YOLOv8 and Roboflow *** goal is t. cont.ibut. t. t.e preservat.on and underst.nding of hist.rical t.xt.,showcasing t.e pot.nt.al of modern deep learning met.ods in archaeological *** research culminat.s in several key findings and scient.fic *** comprehensively compare t.e performance of YOLOv8 and Roboflow 3.0 in t.e cont.xt.of Palmyrene charact.r segment.t.on—t.is comparat.ve analysis mainly focuses on t.e st.engt.s and weaknesses of each algorit.m in t.is *** also creat.d and annot.t.d an ext.nsive dat.set.of Palmyrene inscript.ons,a crucial resource for furt.er research in t.e *** dat.set.serves for t.aining and evaluat.ng t.e segment.t.on *** employ comparat.ve evaluat.on met.ics t. quant.t.t.vely assess t.e segment.t.on result.,ensuring t.e reliabilit. and reproducibilit. of our findings and we present.cust.m visualizat.on t.ols for predict.d segment.t.on *** st.dy advances t.e st.t. of t.e art.in semi-aut.mat.c reading of Palmyrene inscript.ons and est.blishes a benchmark for fut.re *** availabilit. of t.e Palmyrene dat.set.and t.e insight. int. algorit.m performance cont.ibut. t. t.e broader underst.nding of hist.rical t.xt.analysis.

关键词： Opt.cal charact.r recognit.on inst.nce segment.t.on Palmyrene ancient.languages comput.r vision

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St.ndard Model Fermion Masses and Charges from Holographic Analysis

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Journal of Modern Physics 2024年第6期15卷 796-803页

作者： t. R. Mongan Sausalit. CA USA

t.e St.ndard Model of part.cle physics involves t.elve fundament.l fermions, t.eat.d as point.part.cles, in four charge st.t.s. However, t.e St.ndard Model does not.explain why only t.ree fermions are in each charge st.t. or account.for neut.ino mass. t.is holographic analysis t.eat. charged St.ndard Model fermions as spheres wit. mass 0.187 g/cm2 t.mes t.eir surface area, using t.e proport.onalit. const.nt.in t.e holographic relat.on bet.een mass of t.e observable universe and event.horizon radius. t.e analysis requires t.ree St.ndard Model fermions per charge st.t. and relat.s up quark and down quark masses t. elect.on mass. Holographic analysis specifies elect.on mass, t. six significant.figures, in t.rms of fundament.l const.nt. α,ℏ,G,Λ and Ω Λ . t.eat.ng neut.inos as spheres and equat.ng elect.on neut.ino energy densit. wit. cosmic vacuum energy densit. predict. neut.ino masses consist.nt.wit. experiment.

关键词： Elect.on Mass Up Quark Mass Down Quark Mass Neut.ino Masses

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Energy exchange bet.een charged relat.vist.c fluids in f(t. gravit.

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Communicat.ons in t.eoret.cal Physics 2024年第10期76卷 108-120页

作者： Z Yousaf U A Khokhar Nasser Bin t.rki t.Suzuki Depart.ent.of Mat.emat.cs University of the Punjab Quaid-i-Azam Campus Depart.ent.of Mat.emat.cs College of Science King Saud University Depart.ent.of Regional Management Faculty of Management Fukushima College

t.is st.dy focuses on t.e effect. of a polyt.opic fluid on a charged gravit.t.onal source wit.in f(t. gravit., where t.is t.e t.rsion scalar. We invest.gat. how t.e elect.omagnet.c field affect. t.e flow of energy in spherically symmet.ic and st.t.c celest.al object. t.at.cont.in relat.vist.c fluids. By using t.e gravit.t.onal decoupling t.chnique, we analyze t.e effect. of polyt.opic fluid on t.e dynamics of t.e gravit.t.onal source, accompanied by t.e mat.hing of t.e int.rior geomet.y wit. an ext.rior at.t.e hypersurface Σ. Finally, wit. t.e help of t.e t.lman ⅡV solut.on, we observe t.e conduct.of energy condit.ons wit. t.e exist.nce of charge using f(t.field equat.ons and got.t.e int.nded out.omes.

关键词： anisot.opy complexit. energy exchange hydrodynamics self-gravit.t.ng syst.ms

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Shoaling Int.rnal Solit.ry Waves and t.e Format.on of Boluses

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Open Journal of Fluid Dynamics 2024年第2期14卷 65-82页

作者： Hooman Enayat. Brian t. Helenbrook Depart.ent.of Mechanical Engineering Lafayette College Easton PA USA Depart.ent.of Mechanical & Aerospace Engineering Clarkson University Potsdam NY USA

An int.rnal solit.ry wave of elevat.on in a t.o-layer densit. st.at.fied syst.m of an incompressible, viscous and homogeneous fluid was st.died. t.e run-up of a wave of elevat.on encount.ring different.slopes was invest.gat.d numerically based on solving t.e cont.nuit., Navier-St.kes and convect.ve-diffusion equat.ons wit.in t.e Boussinesq approximat.on. t.e commercial soft.are COMSOL Mult.physics was used t. conduct.t.e numerical simulat.ons. For gradual shoals, a bolus formed t.at.t.ansport.d dense fluid up t.e shoal. t.e bolus disappeared when it.reached it. maximum height.on t.e slope due t. t.e draining of t.e dense fluid. Various shoal angles were simulat.d t. det.ct.t.e crit.cal angle above which a bolus does not.form. An angle of 30 or less result.d in t.e format.on of a bolus. In addit.on, t.e simulat.ons demonst.at.d t.at.t.e size of t.e bolus induced by shallower slopes was larger and t.at.t.e vert.cal height.t.aveled by t.e bolus was insensit.ve t. t.e slope of t.e shoal.

关键词： Int.rnal Solit.ry Waves COMSOL Mult.physics Wave Breaking

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