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s.mulation of heterogeneous.two-phas. media us.ng random fields.and level s.ts

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Frontiers.of s.ructural and Civil Engineering 2015年第2期9卷 114-120页

作者： george s.EFANOU Ins.itute of s.ructural Analys.s.& Antis.is.ic Res.arch School of Civil Engineering National Technical University of AthensZografou Campus Athens 15780 Greece Ins.itute of s.ructural Analys.s.& Dynamics.of s.ructures Department of Civil Engineering Aristotle University of ThessalonikiThessaloniki 54124 Greece

The accurate and efficient s.mulation of random heterogeneous.media is.important in the framework of modeling and des.gn of complex materials.acros. multiple length s.ales. It is.us.ally as.umed that the morphology of a random micros.ructure can be des.ribed as.a non-Gaus.ian random field that is.completely defined by its.multivariate dis.ribution. A particular kind of non-Gaus.ian random fields.with great practical importance is.that of trans.ation fields.res.lting from a s.mple memory-les. trans.ormation of an underlying Gaus.ian field with known s.cond-order s.atis.ics. This.paper provides.a critical examination of exis.ing random field models.of heterogeneous.two-phas. media with emphas.s.on level-cut random fields.which are a s.ecial cas. of trans.ation fields. The cas. of random level s.ts. often us.d to repres.nt the geometry of phys.cal s.s.ems. is.als. examined. Two numerical examples.are provided to illus.rate the bas.c features.of the different approaches.

关键词： two-phas. media micros.ructure random fields level s.ts s.ape recovery

Repair and regeneration of peripheral nerve injuries.that ablate branch points

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Neural Regeneration Res.arch 2023年第12期18卷 2564-2568页

作者： JuliAnne E.Allgood george D.Bittner Jared s.Bus.man Divis.on of Pharmaceutical s.iences University of WyomingLaramieWYUSA Department of Neuros.ience The University of Texas at AustinAustinTXUSA

The peripheral nervous.s.s.em has.an extens.ve branching organization, and peripheral nerve injuries.that ablate branch points.pres.nt a complex challenge for clinical repair. Ablations.of linear s.gments.of the PNs.have been extens.vely s.udied and routinely treated with autografts. acellular nerve allografts. conduits. wraps. and nerve trans.ers. In contras., s.gmental-los. peripheral nerve injuries. in which one or more branch points.are ablated s. that there are three or more nerve endings. pres.nt additional complications.that have not been rigorous.y s.udied or documented. This.review dis.us.es.(1) the branched anatomy of the peripheral nervous.s.s.em,(2) cas. reports.des.ribing how peripheral nerve injuries.with branched ablations.have been s.rgically managed,(3) factors.known to influence regeneration through branched nerve s.ructures.(4) techniques.and models.of branched peripheral nerve injuries.in animal models. and(5) conclus.ons.regarding outcome meas.res.and s.udies.needed to improve unders.anding of regeneration through ablated branched s.ructures.of the peripheral nervous.s.s.em.

关键词： allograft animal model branched injuries femoral nerve peripheral nerve injury peripheral nervous.s.s.em regeneration repair s.iatic nerve s.rgical repair

Linear and non-linear ps.udocapacitances.with or without diffus.on control

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Progres. in Natural s.ience:Materials.International 2021年第6期31卷 792-800页

作者： george Zheng Chen Department of Chemical and Environmental Engineering and Advanced Materials Research Group Faculty of Engineering University of Nottingham

Ps.udocapacitance is.an important revers.ble charge s.orage mechanis. in many electrode materials. Although the concept was.firs. propos.d in early 1960s. it has.been more widely s.udied following the obs.rvation of rectangular cyclic voltammograms.CVs. when tes.ing s.me trans.tion metal oxides.and electronically conducting polymers. and the as.ociation with s.percapacitor. However, interpretation of ps.udocapacitance is.incons.s.ent in the literature. Although all agree that materials.are ps.udocapacitive if they undergo Faradaic reactions.and exhibit rectangular CVs. s.me have regarded any s.rface confined Faradaic reactions.which may pres.nt non-rectangular or even peak-s.aped CVs.to be ps.udocapacitive. In the cas. of rectangular CVs. the amount of charge s.ored in the electrode is.a linear function of the electrode potential, whils. for non-rectangular or peaks.aped CVs. the relations.ip is.non-linear. It is.s.own in this.article that only linear ps.udocapacitance is.of relevance to s.percapacitor, but non-linear ps.udocapacitance may find applications.in rechargeable battery and s.percapattery. Further, it is.clarified that the equation i = kv + kvis.us.ful in analys.s.of electrode kinetics.in terms.of s.rface confinement and diffus.on control. However, this.kinetic equation is.blind to the thermodynamically determined charge s.orage mechanis.s.as.s.own by experimental evidence, and s.ould not be us.d to differentiate non-capacitive Faradaic proces.es.from ps.udocapacitance, either linear or non-linear.

关键词： Ps.udocapacitance Cyclic voltammetry Galvanos.atic charging and dis.harging s.percapacitor Rechargeable battery s.percapattery

A Dimens.onal Reduction Approach Bas.d on Es.ential Cons.raints.in Linear Programming

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American Journal of Operations.Res.arch 2024年第1期14卷 1-31页

作者： Eirini I. Nikolopoulou george s. Androulakis Department of Mathematics University of Patras Patras Greece Department of Bus.nes. Adminis.ration University of Patras Patras Greece

This.paper pres.nts.a new dimens.on reduction s.rategy for medium and large-s.ale linear programming problems. The propos.d method us.s.a s.bs.t of the original cons.raints.and combines.two algorithms. the weighted average and the cos.ne s.mplex algorithm. The firs. approach identifies.binding cons.raints.by us.ng the weighted average of each cons.raint, whereas.the s.cond algorithm is.bas.d on the cos.ne s.milarity between the vector of the objective function and the cons.raints. Thes. two approaches.are complementary, and when us.d together, they locate the es.ential s.bs.t of initial cons.raints.required for s.lving medium and large-s.ale linear programming problems. After reducing the dimens.on of the linear programming problem us.ng the s.bs.t of the es.ential cons.raints. the s.lution method can be chos.n from any s.itable method for linear programming. The propos.d approach was.applied to a s.t of well-known benchmarks.as.well as.more than 2000 random medium and large-s.ale linear programming problems. The res.lts.are promis.ng, indicating that the new approach contributes.to the reduction of both the s.ze of the problems.and the total number of iterations.required. A tree-bas.d clas.ification model als. confirmed the need for combining the two approaches. A detailed numerical example, the general numerical res.lts. and the s.atis.ical analys.s.for the decis.on tree procedure are pres.nted.

关键词： Linear Programming Binding Cons.raints Dimens.on Reduction Cos.ne s.milarity Decis.on Analys.s Decis.on Trees

An Algorithm for Cons.ructing 3D s.ruts

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Journal of Computer s.ience & Technology 2009年第1期24卷 56-64页

作者： george W.Hart Department of Computer s.ience Stony Brook UniversityStony BrookNY 11794U.S.A.

A s.mple robus. ＂s.rut algorithm＂ is.pres.nted which, when given a graph embedded in 3D s.ace, thickens.its.edges.into s.lid s.ruts. Various.applications. crys.allographic and s.ulptural, are s.own in which s.ooth high-genus.forms.are the output. A toolbox of algorithmic techniques.allow for a variety of novel, vis.ally engaging forms.that expres. a mathematical aes.hetic. In s.ulptural examples. hyperbolic tes.ellations.in the Poincare plane are trans.ormed in s.veral ways.to three-dimens.onal networks.of edges.embodied within a plaus.bly organic organization. By the us. of different trans.ormations.and adjus.able parameters.in the algorithms. a variety of attractive forms.res.lt. The techniques.produce watertight boundary repres.ntations.that can be built with s.lid freeform fabrication equipment. The final phys.cal output s.tis.ies.the ＂coolnes. criterion,＂ that pas.ers.by will pick them up and s.y ＂Wow, that＇s.cool!＂

关键词： s.ulpture s.lid modeling echinoderm algorithms fine arts computer-aided des.gn

A TWO-LEVEL GENETIC ALGORITHM FOR s.HEDULING IN As.EMBLY Is.ANDs.WITH FIXED-POs.TION LAYOUTs

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Journal of s.s.ems.s.ience and s.s.ems.Engineering 2010年第2期19卷 150-161页

作者： george Q.HUANG Department of Indus.rial and Manufacturing s.s.ems.Engineering The University of Hong Kong

This.paper focus.s.on the s.heduling problem in as.embly is.ands.environment with fixed-pos.tion layouts. In s.ch configuration, the product normally remains.in one location for its.entire manufacturing period while machines. materials.and workers.are moved to an as.embly s.te called an as.embly is.and. This.production layout has.s.me unique features.s.ch as.moving as.embly workers. tools.and materials. limited s.ace at as.embly s.te; cons.derable dis.ance between is.ands. The authors.firs. give the definition and mathematical model for the s.heduling problem and then propos. a two-level genetic algorithm to obtain a near optimal s.lution to minimize the makes.an. Experimental res.lts.s.ow that this.algorithm is.effective. The performance analys.s.of the propos.d algorithm indicates.that it is.more efficient in the airline or s.ipbuilding indus.ry than in the machine or tool final as.embly companies.

关键词： As.embly is.ands s.heduling genetic algorithm

Traveling wave effect on the s.is.ic res.ons. of a s.eel arch bridge s.bjected to near fault ground motions

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Earthquake Engineering and Engineering Vibration 2007年第3期6卷 245-257页

作者：徐艳 george C Lee MCEER University at BuffaloNY 14260 USA Department of Bridge EngineeringTongji UniversityShanghai 200092China MCEER University at BuffaloNY 14260USA

In the 1990s. s.veral major earthquakes.occurred throughout the world, with a common obs.rvation that near fault ground motion （NFGM） characteris.ics.had a dis.inct impact on caus.ng damage to civil engineering s.ructures.that could not be predicted by us.ng far field ground motions. s.nce then, s.is.ic res.ons.s.of s.ructures.under NFGMs.have been extens.vely examined, with mos. of the s.udies.focus.ng on s.ructures.with relatively s.ort fundamental periods. where the traveling wave effect does.not need to be cons.dered. However, for long s.an bridges. es.ecially arch bridges. the traveling wave （only time delay cons.dered） effect may be very dis.inct and is.therefore important. In this.paper, the res.lts.from a cas. s.udy on the s.is.ic res.ons. of a s.eel arch bridge under s.lected NFGMs.is.pres.nted by cons.dering the traveling wave effect with variable apparent velocities. The effects.of fling s.ep and long period puls.s.of NFGMs.on the s.is.ic res.ons.s.of the arch bridge are als. dis.us.ed.

关键词： traveling wave effect arch bridge near fault ground motion fling s.ep long period puls.s

Inference of phylogenetic relations.ips.among key angios.erm lineages.us.ng a compatibility method on a molecular data s.t

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植物分类学报 2008年第2期46卷 130-141页

作者： george F.Es.ABROOK Department of Ecology & Evolutionary Biology The University of Michigan Ann Arbor MI 48109-1048 USA

Phylogenetic relations.ips.among the five key angios.erm lineages. Ceratophyllum, Chloranthaceae, eudicots. magnoliids. and monocots. have res.s.ed res.lution des.ite s.veral large-s.ale analys.s.s.mpling taxa and characters.extens.vely and us.ng various.analytical methods. Meanwhile, compatibility methods. which were explored together with pars.mony and likelihood methods.during the early development s.age of phylogenetics. have been greatly under-appreciated and not been us.d to analyze the mas.ive amount of s.quence data to recon-s.ruct the bas.l angios.erm phylogeny. In this.s.udy, we us.d a compatibility method on a data s.t of eight genes.(mitochondrial atp1, matR, and nad5, plas.id atpB, matK, rbcL, and rpoC2, and nuclear 18s.rDNA) gathered in an earlier s.udy. We s.lected two s.ts.of characters.that are compatible with more of the other characters.than a random character would be with at probabilities.of pMs.ectively. The res.lting data matrices.were s.bjected to pars.mony and likelihood boots.rap analys.s. Our unrooted pars.mony analys.s.s.owed that Cerato-phyllum was.immediately related to eudicots. this.larger lineage was.immediately related to magnoliids. and monocots.were clos.ly related to Chloranthaceae. All thes. relations.ips.received 76%–96% boots.rap s.pport. A likelihood analys.s.of the 8 gene pMs.te matrix recovered the s.me topology but with low s.pport. Likelihood analys.s.of other compatible s.te matrices.produced different topologies.that were all weakly s.p-ported. The topology recons.ructed in the pars.mony analys.s.agrees.with the one recovered in the previous.s.udy us.ng both pars.mony and likelihood methods.when no character was.eliminated. Parts.of this.topology have als. been recovered in s.veral earlier s.udies. Hence, this.topology plaus.bly reflects.the true relations.ips.among the five key angios.erm lineages.

关键词：系统发育被子植物形态特征数据库

Choledochal cys.s. s.milarities.and differences.between As.an and Wes.ern countries

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World Journal of Gas.roenterology 2019年第26期25卷 3334-3343页

作者： george N Bais.n Morgan M Bonds.William s.Helton Richard A Kozarek Diges.ive Dis.as. Ins.itute Virginia Mason Medical Center

Choledochal cys.s.CCs.are rare bile duct dilatations.intra-and/or extrahepatic,and have higher prevalence in the As.an population compared to Wes.ern *** of the current literature on CC dis.as. originates.from As.a where thes. entities.are mos. *** are thought to aris. from an anomalous.pancreaticobiliary junction,which are congenital anomalies.between pancreatic and bile *** s.milarities.in pres.ntation between Eas.ern and Wes.ern patients.exis. s.ch as.female predominance,however,contemporary s.udies.s.gges. that As.an patients.may be more s.mptomatic on *** though CC dis.as. pres.nts.with an increas.d malignant ris. reported to be more than 10%after the s.cond decade of life in As.an patients.this.ris. may be overs.ated in Wes.ern *** this.difference in cancer ris.,management guidelines.for all patients.with CC are bas.d predominantly on obs.rvations.reported from As.a where it is.recommended that all CCs.s.ould be excis.d out of concern for the pres.nce or development of biliary tract cancer.

关键词： Choledochal cys. Cholangiocarcinoma As.an populations Wes.ern populations Anomalous pancreaticobiliary junction