简介：Hi，还记得Reggie（瑞吉）和Jack（杰克）吗？Yes！他们就是本期“呱呱说酷语”里友情客串的小主持！今天，Reggie和Jack来到了“影视俱乐部”，讲述他们穿越历史，过这世上第一个ThanksgivingDay（感恩节）的故事！

简介：Inholographicencryption,doublerandom-phaseencodingintheFresneldomain(DRPEiFD)isaprevalentencryptionmethodbecauseitislenslessandsecure.However,noisesbringadverseeffectsduringdecryption.Inthisletter,weintroducequick-response(QR)codingduringencryptiontoresistnoises.WetransformtheoriginalinformationintoaQRcodeandthenencryptthecodeasahologramthroughDRPEiFD.Toretrievetheinput,wedecryptthehologramintheoppositemannertotheencryptionandsubsequentlyobtainaQRcodewithnoises.Byscanningthiscodewithproperapplicationsinsmartphones,wecanobtainanoise-freeretrieval.Numericalexperimentsandimagesscannedbyasmartphoneareshowntovalidateourproposedmethod.

简介：Toremovethescatteringeffectofthedisturbingsoundonthetargetsourcewhenimplementingnearfieldacousticholographyinanon-freefield,afreefieldrecoverytechniquebasedonthesphericalwavesuperpositionmethodisproposed.Inthemethod,thesoundfieldseparationtechniquebasedonthesphericalwavesuperpositionmethodisfirstusedtoseparatetheincomingandoutgoingfields,andafurtherstepforseparatingtheradiatedandscatteredfieldsisperformedbyutilizingthesurfaceadmittanceofthetargetsourceastheboundaryconc1ition.Thetechniquemakesitpossibletocorrectlyidentifynoisesourcesinanon-freesoundfeld.Thebasicprincipleofthetechniqueisdescribedfirstly,amethodforchoosingtheoptimalnumberofsphericalwaveexpansiontermsisgiven,andtwonumericalsimulationsareusedtodemonstratethevalidityofthistechnique.Itisshownthat,forthelowerfrequency,thescatteringeffectcanbeneglected,andtheradiatedfieldofthetargetsourcecanbeobtainedbythesoundfieldseparationtechnique,however,astheincreasingofthefrequcncy,thescatteringeffcctcannotbeneglected,andthefrecfieldrecoverytechniquehastobeusedtoobtaintheradiatedfieldofthetargetsource.

简介：Thestructuresinengineeringcanbesimplifiedintoelasticbeamswithconcentratedmassesandelasticspringsupports.Studyingthelawofvibrationofthebeamscanbeahelpinguidingitsdesignandavoidingresonance.BasedontheLaplacetransformmethod,themodeshapefunctionsandthefrequencyequationsofthebeamsinthetypicalboundaryconditionsarederived.Acantileverbeamwithalumpedmassandaspringisselectedtoobtainitsnaturalfrequenciesandmodeshapefunctions.AnexperimentwasconductedinordertogetthemodalparametersofthebeambasedontheNExT-ERAmethod.Bycomparingtheanalyticalandexperimentalresults,theeffectsofthelocationsofthemassandspringonthemodalparameterarediscussed.Thevariationofthenaturalfrequencieswasobtainedwiththechangingstiffnesscoefficientandmasscoefficient,respectively.Thefindingsprovideareferenceforthevibrationanalysismethodsandthelumpedparameterslayoutdesignofelasticbeamsusedinengineering.

简介：隔离轴承和dampers经常在墩和上层建筑之间被安装在大地震下面减少桥的地震回答。这份报纸论述为桥更潮湿的新奇的钢。更潮湿作为精力驱散部件采用钢盘子，并且采用垂直免费机制完成一个大变丑能力。用用称为ABAQUS的一个有限元素节目的控制排水量的周期的装载和数字分析的伪静电干扰测试被进行调查行为更潮湿，并且设计方法论基于测试和数字分析被建议。从这研究获得的主要结论如下：(1)新dampers在大排水量下面有稳定的磁滞现象行为；(2)有限元素分析能模仿行为与令人满意的精确性更潮湿；并且(3)简化了设计方法论更潮湿是有效的。

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简介：同时的免费传送对流在上面并且在一个一致地激烈的水平盘子下面广泛地被调查了在等温的表面的情况中，并且一致地激烈的表面，但是总是作为液体(Pr=0.7)假定仅仅空气。不过，有工作，处理其结果证明Pr上的Nu依赖不能被一条幂定律简单地与Gr那的一样的代表表示的水平盘子。在等温的水平长带的情况中学习Prandtl数字影响因此被认为有用。，结果为长带的更低的表面显示出那在Gr的Nu依赖能被一条幂定律与代表结束表示到Gr那，为代表是的上面的表面聪明地不同。与调查状况有关的相关方程被建议。

简介：Ahigher-efficientthree-dimensionalnon-hydrostaticmodelisdevelopedtosimulatesmallamplitudefreesurfaceflowsbasedonastaggeredunstructuredgrid.Inthismodel,afractionalstepalgorithmisadoptedtosolvetheNavier-Stokesequationsintwomajorsteps.Atop-layerpressuremethodisproposedtominimizethenumberofverticallayersandsubsequentlythecomputationalcost.Threeclassicalexamplesofsmallamplitudefreesurfaceflowsareusedtodemonstratethecapabilityandefficiencyofthemodel.Thesatisfactoryresultsdemonstratedthecapabilityandefficiencyofmodellingarangeofsmallamplitudefreesurfaceflowswithonlyasmallnumberofverticallayers.

简介：Ba0.85Ca0.15Ti0.9Zr0.1O3(BCTZ)lead-freepiezoelectricceramicsco-dopedwithCeO2(x=0.1wt.%,0.2wt.%,0.3wt.%,0.4wt.%,0.5wt.%)andLi2CO3(0.6wt.%)werepreparedbyconventionalsolid-statereactionmethod.InfluenceofCeO2dopingamountonthepiezoelectricproperties,dielectricproperties,phasecompositionandmicrostructureofpreparedBCTZlead-freepiezoelectricceramicsdopedwithLi2CO3wereinvestigatedbyX-raydiffraction(XRD)andscanningelectronmicroscopy(SEM)andotheranalyticalmethods.TheresultsshowedthatthesinteredtemperatureofBCTZlead-freepiezoelectricceramicsdopedwithCeO2decreasedgreatlywhenLi2CO3dopingamountwas0.6wt.%;apureperovskitestructureofBCTZlead-freepiezoelectricceramicsco-dopedwithLi2CO3andCeO2andsinteredat1050°Ccouldalsobeobtained.Thepiezoelectricconstant(d33),therelativepermittivity(εr)andtheplanarelectromechanicalcouplingfactor(kp)ofBCTZceramicsdopedwithLi2CO3increasedfirstlyandthendecreased,thedielectricloss(tanδ)decreasedfirstlyandthenincreasedanddecreasedatlastwhenCeO2dopingamountincreased.TheinfluenceofCeO2dopingonthepropertiesofBCTZlead-freepiezoelectricceramicsdopedwithLi2CO3werecausedby'softeffect'and'hardeffect'piezoelectricadditiveandcausinglatticedistortion.WhenCeO2dopingamount(x)was0.2wt.%,theBCTZceramicsdopedwithLi2CO3(0.6wt.%)andsinteredat1050°Cpossessedthebestpiezoelectricpropertyanddielectricpropertywithd33of436pC/N,kpof48.3%,εrof3650,tanδof1.5%.

简介：TheesterificationoflauricacidwithmethanolcouldbeefficientlycatalyzedbyZrOCl2·8H2O,andthisreactionwasstudiedtodevelopagreenmethodforbiodieselproduction.Theinfluencingfactors,suchasamountofcatalyst,reactiontimeandmolarratioofacidtomethanol,wereinvestigated.TheresultsindicatedthattheZrOCl2·8H2Ocatalystshowedhighcatalyticactivity,andgavea97.0%methyllaurateconversionrateunderthefollowingoptimizedconditions,viz.:alauricacid/methanolmolarratioof1:10,acatalystdosageof4%,andareactiondurationof2hatmethanolrefluxingtemperature.Thecatalystcouldbeeasilyrecoveredwhileitsactivitycouldbewellretainedafterthreecycles.TheZrOCl2·8H2Ocatalystalsoexhibitedexcellentcatalyticactivityfortheesterificationofdifferentfreelong-chainfattyacids(includingnonedibleoilswithhighacidvalue)withdifferentshortcarbonchainalcohols.Therefore,theZrOCl2·8H2Ocatalysthasgoodpotentialforthesynthesisofbiodieselfromlow-costfeedstockssuchaswastevegetableoilsandnon-edibleoils.

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简介：Apopulationofricebrownplanthopper(BPH)NilaparvatalugenscollectedfromapaddyfieldinHangzhouwassuccessivelyrearedonsusceptiblericeTaichungNative1(TN1)inalaboratoryfreefrominsecticidesformorethan14generations.Thechangesinsusceptibilitytoinsecticidesandecologicalfitnessondifferentresistantricevarietiesweremonitoredineachgeneration.Theresistanceratiotoimidaclopridsharplydeclinedwiththesuccessionofrearinggenerationswithoutinsecticidesfrom359.94-foldatF1to6.50-foldatF14comparedwiththesusceptiblestrain,andtheresistanceratiotochlorpyrifoswasfrom9.90-foldatF1to5.94-foldatF14.Nymphaldurationandweightsofnewlyhatchedfemaleadultsweresignificantlyaffectedbyricevariety,generationandtheirinteractions,butnymphalsurvivalwassignificantlyaffectedbythegenerationonly.Theratioofbrachypterousadultsinmaleswasaffectedbythegenerationandgeneration×varietyinteraction,whereasnodifferencewasfoundinfemales.Nymphaldurationextendedwithincreasinggenerations,andthefemalenymphaldurationwasshorterinthesusceptiblevarietyTN1thanthoseintheresistantvarietiesIR26andIR36.Inaddition,thefemaleadultweightinTN1washigherthanthoseinIR26andIR36.TheseresultsindicatedthattheresistanceoffieldBPHpopulationtoinsecticideswasreversedafterseveralgenerationsofno-exposuretoinsecticides,andtheecologicalfitnessinTN1washigherthanthoseinIR26andIR36.ThesefindingssuggestedtherationalandreduceduseofinsecticidesincombinationwiththemanipulationofresistantricevarietieswouldbeeffectiveforBPHmanagement.

简介：AgraphissaidtobeK1,4-freeifitdoesnotcontainaninducedsubgraphisomorphictoK1,4.Letkbeanintegerwithk≥2.WeprovethatifGisaK1,4-freegraphoforderatleast11k-10withminimumdegreeatleastfour,thenGcontainskvertex-disjointcopiesofK1+(K1∪K2).