简介：Theexceptionalpoint(EP)isoneofthetypicalpropertiesofparity–time-symmetricsystems,arisingfrommodescouplingwithidenticalresonantfrequenciesorpropagationconstantsinoptics.Hereweshowthatinadditiontotwodifferentmodescoupling,anonuniformdistributionofgainandlossleadstoanoffsetfromtheoriginalpropagationconstants,includingbothrealandimaginaryparts,resultingintheabsenceofEP.Thesebehaviorsareexaminedbythegeneralcoupled-modetheoryfromthefirstprincipleoftheMaxwellequations,whichyieldsresultsthataremoreaccuratethanthosefromtheclassicalcoupled-modetheory.Numericalverificationviathefiniteelementmethodisprovided.Intheend,wepresentanapproachtoachievelosslesspropagationinageometricallysymmetricwaveguidearray.

简介：Alinear4-nodequadrilateralquasi-conformingplaneelementwithinternalparametersisproposed.Theelementpreservesadvantagesofthequasi-conformingtechnique,includinganexplicitstiffnessmatrix,whichcanbeappliedtononlinearproblems.Theweakpatchtestguaranteestheconvergenceoftheelement.ThenthelinearelementisextendedtothegeometricallynonlinearanalysisintheframeworkofTotalLagrangian(TL)formulation.Thenumericaltestsindicatethatthepresentelementisaccurateandinsensitivetomeshdistortion.

简介：基于Timoshenko和薄墙的横梁的理论，有一般的开的生气的节的空间薄墙的横梁的一个新有限元素模型在纸，几个因素在被包括例如被介绍侧面砍变丑，不一致的扭转和秒顺序产生的经纱砍应力，弯曲和扭转联合，并且有小紧张的大排水量。与在元素的一个另外的内部节点，元素僵硬矩阵被增长虚拟工作在更新的Lagrangian(UL)明确的表达推出。数字例子证明介绍模型很好描述空间薄墙的横梁的几何上非线性的性质。

简介：AbstractFor the detection of steatosis, quantitative ultrasound imaging techniques have achieved great progress in past years. Magnetic resonance imaging proton density fat fraction is currently the most accurate test to detect hepatic steatosis. Some blood biomarkers correlate with non-alcoholic steatohepatitis, but the accuracy is modest. Regarding liver fibrosis, liver stiffness measurement by transient elastography (TE) has high accuracy and is widely used across the world. Magnetic resonance elastography is marginally better than TE but is limited by its cost and availability. Several blood biomarkers of fibrosis have been used in clinical trials and hold promise for selecting patients for treatment and monitoring treatment response. This article reviews new developments in the non-invasive assessment of non-alcoholic fatty liver disease (NAFLD). Accumulating evidence suggests that various non-invasive tests can be used to diagnose NAFLD, assess its severity, and predict the prognosis. Further studies are needed to determine the role of the tests as monitoring tools. We cannot overemphasize the importance of context in selecting appropriate tests.

简介：Thispaperinvestigatesthemathematicfeaturesofnon-linearmodelsanddiscussestheprocessingwayofnon-linearfactorswhichcontributestothenon-linearityofanonlinearmodel.Onthebasisoftheerrordefinition,thispaperputsforwardanewadjustmentcriterion,SGPE.Last,thispaperinvestigatesthesolutionofanon-linearregressionmodelinthenon-linearmodelspaceandmakesthecomparisonbetweentheestimatedvaluesinnon-linearmodelspaceandthoseinlinearmodelspace.

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简介：China’sCrudeMagnesiumOutputDuringJanuary-FebruaryAccordingtothestatisticsofNonferrousMetalsAssociationofChina,China’soutputofcrudemagne-

简介：Anumericalanalysisofnon-Newtonianfluidflowinnon-planararterywithbifurcationwasperformedbyusingafiniteelementmethodtosolvethethree-dimensionalNavier-Stokesequationscoupledwiththenon-Newtonianconstitutivemodels,includingCarreau,CrossandBinghammodels.Theobjectiveofthisstudyistoinvestigatetheeffectsofthenon-Newtonianpropertiesofbloodaswellascurvatureandout-of-planegeometryinthenon-planardaughtervesselsonthevelocitydistributionandwallshearstress.Theresultsofthisstudysupporttheviewthatthenon-planarityofbloodvesselsandthenon-Newtonianpropertiesofbloodareofimportantinhemodynamicsandplayasignificantroleinvascularbiologyandpathophysiology.

简介：Bacterialflagellarfilamentcanundergoastress-inducedpolymorphicphasetransitioninbothvitroandvivoenvironments.Thefilamenthas12differenthelicalforms(phases)characterizedbydifferentpitchlengthsandhelixradii.Whensubjectedtothefrictionalforceofflowingfluid,thefilamentchangesbetweenaleft-handednormalphaseandaright-handedsemi-coiledphaseviaphasenucleationandgrowth.Thispaperdevelopsnon-localfiniteelementmethod(FEM)tosimulatethephasetransitionunderad...

简介：SeveralextensionsofthelogicprogramminglanguagePrologtononHornclausesusecaseanalysistohandlenon-Hornclauses.Inthispaper,analyticalandempriricalevidencesarepresentedtoshowthat,bymakingasetofclausesless'non-Horn'usingpredicatedrenaming.theperformanceofthesecase-analysisbasedprocedurescanbeimprovedsignificantly.Inaddition,thepaperalsoinvestigatedtheproblemofefficeientlyconstructingapredicaterenamingthatreducesthedegreeof'non-Hornness'ofaclausesetmaximally.Itisshownthatthisproblemoffindingaredicaterenamingtoachieveminimal'non-Hornness'isNP-complete.

简介：Akineticequationofnon-isothermalcrystamzationwasderivedbyextendingAvrami’sequationtothenon-isothermalsituation.Morecrystallizationinformationcanbeobtainedfromthiskineticequation.Thecurvesofnon-isothermalandisothermalcrystallizationswereanalysedandcomparedforpoly(ethyleneterephthalate)(PET),andtheresultswerediscussed.

简介：Non-invasiveventilation(NIV)istheprovisionofventilatorysupportwithoutinstrumentationoftheairway.Itcanbeachievedusinganegative-pressuremachine(e.g.‘ironlung')or,morecommonly,withpositivepressureadministeredthroughawell-fittingmask.Thiscontributionconsiderspositivepressureventilationonly;negativepressureisnowseldomused.

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简介：为光滑的功能的一个家庭，作者显示出那，在某些通用条件下面，所有extremal(最小、最大)点是非退化的。

简介：在这篇论文，非各向同性的Jacobi假光谱方法被建议，它的应用斧子考虑了。一些结果在上；多维的Jacobi高斯类型插值和相关Bernstein杰克森类型不平等斧子建立了，它起一个重要作用在假光谱方法。假光谱方法被用于一二--维的单个问题中间axisymmetric上的一个问题领域。建议计划的集中被建立。数字结果表明建议方法的效率。

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简介：Abriefaccountisprovidedoncrack-tipsolutionsthathaverecentlybeenpublishedintheliteraturebyemployingtheso-calledGRADELAmodelanditsvariants.TheGRADELAmodelisasimplegradientelasticitytheoryinvolvingoneinternallengthinadditiontothetwoLame'constants,inanefforttoeliminateelasticsingularitiesanddiscontinuitiesandtointerpretelasticsizeeffects.Thenon-singularstrainsandnon-singular(butsometimessingularorevenhypersingular)stressesderivedthiswayunderdifferentboundaryconditionsdifferfromeachotherandtheirphysicalmeaninginnotclear.Thisisdiscussedwhichfocusontheformandphysicalmeaningofnon-singularsolutionsforcrack-tipstressesandstrainsthatarepossibletoobtainwithintheGRADELAmodelanditsextensions.

简介：Data ,27.3%,from 

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简介：作者为可能非加倍，但是满足某些生长条件的氡措施给Morrey空格的一个自然定义，并且在泛音分析和他们的珍视向量的扩展在一些古典操作符的这些空格调查围住的海角。