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简介：Onepredatortwopreysystemisaresearchtopicwhichhasboththetheoreticalandpracticalvalues.Thispaperprovidesanaturalconditionoftheexistenceofstablepcsitivesteady-statesolutionsfortheonepredatortwopreysystem.Underthisconditonwestudytheexistenceofthepositivesteady-statesolutionsatvicinityofthetripleeigenvaluebyimplicitfunctiontheorem,discussthepositivestablesolutionproblembifureatedfromthesemi-trivialsolutionscontainingtwopositivecomponentswiththehelpofbifurcationandperturbationmethods.

简介：OrderedmesoporouscopperincorporatedAl2O3（Cu/Al2O3）withhighCudispersionwerepreparedbyafacilesolutioncombustionsynthesismethodusingaluminumnitrateandcoppernitrateasoxidantsandureaasfuel.Itisafacileandgreenroutetosynthesizecatalystsfordimethyletherdirectlyfromsyngas.Cu/Al2O3catalystswerecharacterizedbyXRD,N2adsorption–desorption,SEM-EDS,andH2-TPR.Theresultsindicatethatthecatalystsobtainanorderedmesoporousstructureandcopperishomogenouslydispersed.ThemesoporousCu/Al2O3catalystswereutilizedasbifunctionalcatalystsinsyngastodimethyletherreaction（STD）.ThecoppercontentaffectsthecatalyticperformanceinSTDreaction.TheCOconversionandDMEselectivityofCu/Al2O3with15%coppermolarratioachieve52.9%and66.1%,respectively.Moreover,themesoporousCu/Al2O3catalystsshowexcellentstabilityinSTDreaction.

简介：一张图的一个顶点被说统治它的邻居的本身和所有。图G的一个双统治集合是G的顶点的集合D，以便G的每个顶点被D的至少二个顶点统治。图G的双支配数字是G的一个双统治集合的最小的集的势。为图G=(V，E)，如果V(G)\D的每个顶点在D有至少二位邻居，子集DV(G)是一个2-dominating集合，当如果，统治G的集合是2-outer-independent的时另外集合V(G)\D是独立的。G的2-outer-independent支配数字是统治G的集合的2-outer-independent的最小的集的势。这份报纸加一个与双支配数字平等者描绘所有树到2-outer-independent支配数字。

简介：Oneofthemainrequirementsofcognitiveradiosystemsistheabilitytodetectthepresenceoftheprimaryuserwithfastspeedandpreciseaccuracy.Toachievethat,apossibletwo-stagespectrumsensingschemeissuggestedinthispaper.Morespecifically,afastspectrumsensingalgorithmbasedontheenergydetectionisintroducedfocusingonthecoarsedetection.Acomplementaryfinespectrumsensingalgorithmadoptsone-ordercyclostationarypropertiesofprimaryuser'ssignalsintimedomain.Sincetheone-orderfeaturedetectionisperformedintimedomain,thereal-timeoperationandlow-computationalcomplexitycanbeachieved.Also,itdrasticallyreduceshardwareburdensandpowerconsumptionasopposedtotwo-orderfeaturedetection.Thesensingperformanceoftheproposedmethodisstudiedandtheanalyticalperformanceresultsaregiven.Theresultsindicatethatbetterperformancecanbeachievedinproposedtwo-stagesensingdetectioncomparedtotheconventionalenergydetector.

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简介：由密度功能的计算，我们调查在一个维的泛音陷井限制的Bose费密混合的地面状态性质。有接触相互作用的波色子和极化的费米子的同类的混合能被Bethe-ansatz方法确切解决。在给地面状态精力密度的准确公式以后，我们采用本地密度的近似决定每个部件的密度分发。相互作用什么时候足够强壮却有限，被显示出随相互作用的增加，全部的密度分发演变到在二个部件之间的像费密的分发和系统展览阶段分离。当在无限的相互作用限制波色子和费米子显示完全一样的像费密的分布并且分阶段执行时，分离消失。

简介：Weintroduceanewmodelofone-dimensional(1D)photoniccrystalcomposedofalternatelyarrangedRHMandLHMlayerswithpositiveandnegativerefractiveindicesrespectively,forwhichthetransmissionspectraofthemodelarecalculatednumericallywiththetransfermatrixmethod,andtheband-gapstructureandthepolarizationpropertiesareanalyzed.Wefoundthattheintroductionofnegativerefractiveindexlayers(i.e.LHMmediumlayers)givesrisetosomepeculiarband-gapstructureandpolarizationpropertiesasfollows.Firstly,theforbiddenbandsareextremelywideandthetransmissionbandsareverysharpwithoutoscillation;andsecondly,thechangeofincidentanglehasdifferentinfluencesontheforbiddenbandsofTEandTMmodes.FortheTMmode,theforbiddenbandwidthdecreasessubstantiallyandfinallyvanishes,andfortheTEmodewithcentralwavelength,thetotalreflectionhappensatanyincidentangle.

简介：在英国PLASA2006展览会上，著名音箱制造商Funktion-One发布了可以运输的F221双单元21＂超重低音系统（图）。之前已在扩声领域大量采用、应用在18＂单元的F218以及Infra—bass／Infrahorn系统上的低音系统，可将低频增强下潜至30Hz。

简介：TheYangziPetrochemicalCompanyisthefirstoneamongdomesticaromaticsmanufacturerstoadopttheUOP’slatestnoveladsorbentduringqualityupgradingofitsNo.2xyleneunit.OnOctober23,2013thisunithasbeencontinuouslydeliveringxyleneproductwithapurityof

简介：Objective:Toinvestigatesurgicalindications,operativetechniques,complicationsandauditoryandspeechrehabilitationforcochlearimplant(CI)inchildrenwithotitismediawitheffusion(OME).Materia!andmethods:Thisisaretrospectivereviewofrecordsof24childrenwithbilateralprofoundsensorineuralhearinglossandOMEwhowereimplantedduringJanuary2011toNovember2014intheDepartmentofOtorhinolaryngologyandHeadandNeckSurgeryatthePLAHospital,usingone-stageimplantationviathefacialrecessapproachandroundwindowinsertion.Theincuswasremovedin8casesduringtheimplantationprocedure.Localinfiltrationofdexamethasoneandadrenalineinthemiddleearwasalsoperformed.Postoperativecomplicationswereexamined.PreoperativeandpostoperativequestionnairesincludingCategoriesofAuditoryPerformance(CAP).SpeechIntelligibilityRating(SIR),andtheMeaningfulAuditoryIntegrationScale(MAIS)werecollected.Results:Allelectrodeswereimplantedsuccessfullywithoutanyimmediateordelayedcomplications.Inllammatorychangesofmiddleearmucosawitheffusionwerenotedinallimplantedears.Thescoresofpost-implantCAPandSIRincreasedsignilicantlyinall24cases(t=-25.95and-14.09.respectivelyforCAPandSIR.p<0.05).Conclusions:One-stageCIviathefacialrecessapproachwithroundwindowinsertionissafeandeffectiveincochlearimplantcandidateswithOME,asseeninthe24childreninourstudywhoachievedimprovedauditoryperformanceandspeechintelligibilityafterCI.

简介：因为他们能容易与二维、三维的数字模型相比被规划并且花去更少的时间，一个维的数字模型流行地在沉积运输研究被使用。特别地，他们拥有更大的能力与许多支流在大河盆被使用。这篇论文论述能够精明的全部负担的沉积运输的一个一个维的数字模型。cross-section-averaged沉积运输能力和恢复系数在推迟的负担模型被探讨。因此，这个一个维的模型能在黄河被用于好推迟的负担并且到hyperconcentrated流动。而且，为不稳定的不一致的推迟的沉积运输的方程的一个新discretization计划被建议。模型用在黄河上在Hongshui河和Sanmenxia水库里从Yantan水库测量的数据被校准。有地大小的计算的水水平和河床变丑的比较证明改进数字模型能够预言处于各种各样的状况排序的流动，沉积运输，床变化，和床材料，与合理精确性和可靠性。

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简介：在这份报纸，我们为本地不连续的Galerkin(LDG)学习错误的superconvergence为一个维的线性寓言的方程的有限元素方法当轮流出现的流动被使用时。我们证明如果我们使用piecewisek-th度多项式，在LDG答案和准确答案之间的错误是(k+2)在Radau的-th顺序superconvergent与合适的起始的discretization指。而且，我们也证明LDG答案是(k+2)为到准确答案的特别设计的错误的-th顺序superconvergent。尽管我们仅仅考虑周期的边界状况，这个边界条件不是必要的，自从我们不使用Fourier分析。我们的分析为任意的常规网孔并且为有任意的k的Pk多项式是有效的1。我们执行数字实验证明superconvergence率在这证明纸是锋利的。[从作者抽象]

简介：由雇用绝缘的连续统模特儿和Loudon“s单轴的水晶模型，接口光(IO)在独立quasi-one-dimensional(Q1D)的声子模式wurtzite矩形的量电线被导出并且分析。freestandingwurtzite上的数字计算轧了量电线被执行。结果表明IOmodes的分散频率易感知地取决于Q1Dwurtzite的几何结构矩形的量电线，在z方向的免费波浪数字k_z和非极的矩阵经常的电介质。在矩形的量电线清楚地是的Q1Dwurtzite的IO模式的Thedegenerating行为在小波浪数字k_z和长度的大比率的情况中观察了到矩形的十字路口侧面的宽度。IO模式的有限频率行为深深地被分析了，并且在平面量井和圆柱的量电线也被做的wurtzite与那些详细说明了比较。现在的理论能在各向同性的矩形的量电线中被看作那的归纳，并且一旦wurtzite材料的anisotropy被忽略，它能自然地归结为Q1D各向同性的量电线的盒子。

简介：TwoseriesofterritremBanalogues(10a-10cand18)havebeendesignedandsynthesizedfromjujubogenin5awhichwaspreparedfromjujubogeninglycosides5bobtainedfromtheleavesofZizyphusjujuba.Thestructuresofthenewcompoundswereconfirmedby1H-,13C-NMRandMSdata.Compounds10cand18showedweakinhibitoryeffectonAChEat10^-4mol/E.

简介：Asimpleone-potnon-isocyanaterouteforsynthesizingthermoplasticpolyureasispresented.Insituurethanizationwasconductedfromthering-openingreactionofethylenecarbonatewithpoly(propyleneglycol)bis(2-aminopropylether)andhexanediamine,m-xylylenediamine,ordiethyleneglycolbis(3-aminopropyl)etherat100℃for6hundernormalpressure.Melttransurethanepolycondensationwassuccessivelyconductedat170℃underareducedpressureof399Pafordifferenttimeperiods.Aseriesofnonisocyanatethermoplasticpolyureas(NI-TPUreas)wereprepared.TheNI-TPUreaswerecharacterizedbygelpermeationchromatography,FTIR,1H-NMR,differentialscanningcalorimetry,thermogravimetricanalysis,wide-angleX-raydiffraction,atomicforcemicroscopy,andtensiletest.NI-TPUreasexhibitedMnofupto1.67×10^4g/mol,initialdecompositiontemperatureover290℃,andtensilestrengthofupto32MPa.SeveralcrystallizableNI-TPUreasexhibitedTmexceeding98℃.NI-TPUreaswithgoodthermalandmechanicalpropertieswerepreparedthroughagreenandsimpleone-potnon-isocyanateroute.

简介：Thispaperisconcernedwithasingularlimitfortheone-dimensionalcompressibleradiationhydrodynamicsmodel.ThesingularlimitweconsidercorrespondstothephysicalproblemoflettingtheBouguernumberinfinitewhilekeepingtheBoltzmannnumberconstant.InthecasewhenthecorrespondingEulersystemadmitsacontactdiscontinuitywave,WangandXie（2011）[12]recentlyverifiedthissingularlimitandprovedthatthesolutionofthecompressibleradiationhydrodynamicsmodelconvergestothestrongcontactdiscontinuitywaveintheL∞-normawayfromthediscontinuitylineatarateofε14,asthereciprocaloftheBouguernumbertendstozero.Inthispaper,WangandXie’sconvergencerateisimprovedtoε7/8byintroducinganewaprioriassumptionandsomerefinedenergyestimates.Moreover,itisshownthattheradiationfluxqtendstozerointheL∞-normawayfromthediscontinuityline,ataconvergencerateasthereciprocaloftheBouguernumbertendstozero.

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