简介:Wepresentthesolidmodeleditdistance(SMED),apowerfulandflexibleparadigmforexploitingshapesimilaritiesamongstCADmodels.ItisdesignedtomeasurethemagnitudeofdistortionsbetweentwoCADmodelsinboundaryrepresentation(B-rep).Wegivetheformaldefinitionbyanalogywithgrapheditdistance,oneofthemostpopulargraphmatchingmethods.Toavoidtheexpensivecomputationalcostpotentiallycausedbyexactcomputation,anapproximateprocedurebasedonthealignmentoflocalstructuresetsisprovidedinaddition.Inordertoverifytheflexibility,wemakeintensiveinvestigationsonthreetypicalapplicationsinmanufacturingindustry,anddescribehowourmethodcanbeadaptedtomeetthevariousrequirements.Furthermore,amultilevelmethodisproposedtomakefurtherimprovementsofthepresentedalgorithmonbotheffectivenessandefficiency,inwhichthemodelsarehierarchicallysegmentedintotheconfigurationsoffeatures.ExperimentresultsshowthatSMEDservesasareasonablemeasurementofshapesimilarityforCADmodels,andtheproposedapproachprovidesremarkableperformanceonareal-worldCADmodeldatabase.
简介:Thedevelopmentofcancernanotherapeuticshasattractedgreatinterestintherecentdecade.Cancernanotherapeuticshaveovercomeseverallimitationsofconventionaltherapies,suchasnonspecificbiodistribution,poorwatersolubility,andlimitedbioavailability.Nanoparticleswithtunedsizeandsurfacecharacteristicsarethekeycomponentsofnanotherapeutics,andaredesignedtopassivelyoractivelydeliveranti-cancerdrugstotumorcells.Weprovideanoverviewofnanoparticle-baseddrugdeliverymethodsandcancertherapiesbasedontumor-targetingdeliverystrategiesthathavebeendevelopedinrecentyears.
简介:Inthiswork,thefactorsandparametersofatestmethodonabrasionresistanceatelevatedtemperatureswerediscussedandresearched.Firstofall,theprecisiontestsofthetestmethodonabrasionresistanceatelevatedtemperatureswereconductedin8laboratories.Theresultssuchasthestandarddeviationandreproducibilityshowgoodrepeatabilityandreliability.Therelationshipbetweenthestabilityofrefractoryperformanceandthestandarddeviationoftheirwearvaluewasanalyzed.ThentheimpactoftheheattreatmentconditionofunshapedrefractoriesandoxidationofSiCsandasabrasiveonthelostvolumeofthetestedspecimenswasresearched.
简介:PyriculariaoryzaeanamorphofMagnaportheoryzaeisoneofthemostnotoriousfungalpathogenscausingsevereeconomiclossinriceproductionworldwide.Variousmethods,viz.cultural,biologicalandmolecularapproaches,areutilizedtocounteractthispathogen.Moreover,sometolerantorresistantricevarietieshavebeendevelopedwiththehelpofbreedingprogrammes.Isolationandmolecularcharacterizationofdifferentblastresistancegenesnowopenthegatefornewpossibilitiestoelucidatetheactualallelicvariantsofthesegenesviavariousmolecularbreedingandtransgenicapproaches.However,thebehavioralpatternofthisfungusbreakupstheresistancebarriersintheresistantortolerantricevarieties.Thishost-pathogenbarrierwillbepossiblycounteredinfutureresearchbycomparativegenomicsdatafromavailablegenomesequencedataofriceandM.oryzaefordurableresistance.Presentreviewemphasizedfascinatingrecentupdates,newmolecularbreedingapproaches,transgenicandgenomicsapproaches(i.e.miRNAandgenomeediting)forthemanagementofblastdiseaseinrice.Theupdatedinformationwillbehelpfulforthedurable,resistancebreedingprogrammeinriceagainstblastpathogen.
简介:ResistanceanalysisisanimportantanalyticalmethodusedtoevaluatethehydrodynamicperformanceofHighSpeedCraft(HSC).AnalysisofmultihullresistanceinshallowwaterisessentialtotheperformanceevaluationofanytypeofHSC.Shipsoperatinginshallowwaterexperienceincreasesinresistancebecauseofchangesinpressuredistributionandwavepattern.Inthispaper,theshallowwaterperformanceofanHSCdesignconcept,thesemi-SmallWaterplaneAreaTwinHull(semi-SWATH)form,isstudied.Thehullisinstalledwithfinstabilizerstoreducedynamicmotioneffects,andtheresistancecomponentsofthehull,hulltrimcondition,andmaximumwaveamplitudearoundthehullaredeterminedviacalmwaterresistancetestsinshallowwater.Thesecriteriaareimportantinanalyzingsemi-SWATHresistanceinshallowwateranditsrelationtoflowaroundhull.Theforefinangleisfixedtozerodegrees,whiletheaftfinangleisvariedto0o,5o,10o,and15o.Foreachconfiguration,investigationsareconductedwithdepthFroudenumbers(FrH)rangingfrom0.65to1.2,andtheresistancetestsareperformedinshallowwateratthetowingtankofUTM.Analysisresultsindicatethattheresistance,wavepattern,andtrimofthesemi-SWATHhullformareaffectedbythefinangle.Theresistanceisamplifiedwhereasthetrimandsinkagearereducedasthefinangleincreases.IncreasesinfinanglecontributetoseakeepingandstabilitybutaffectthehullresistanceofHSCs.
简介:多孔的媒介在生产和生活,以及在科技有大量应用。在多孔的媒介的流动抵抗的学习在工业、农业的生产上有大效果。通过一张20公里玻璃范围床的液体流动的流动抵抗试验性地被学习。在Ergun方程和试验性的数据之间有重要偏差,这被发现。一个蹒跚的毛孔喉咙模型被建立在随机包装的多孔的媒介调查流动抵抗。一个假设被做粒子在常规三角安排被蹒跚。在随机的多孔的媒介的流动抵抗的分析明确的表达被导出。在明确的表达没有实验常数,每个参数有一个特定的物理意思。明确的表达预言在对试验性的数据的好同意。偏差在25%的范围以内。这证明蹒跚的毛孔喉咙模型是讲理的并且被期望被更多的实验验证并且延长了到另外的多孔的媒介。
简介:Anewtypeofhybridweldingmethodcalledresistanceplugwelding(RPW)wasfirstlyadoptedtoachievetheconnectingofdissimilarsteel,mainlyasforthepoorweldingcharacteristicsofhighstrengthsteelproducedbyincreasingcarbon,manganese,silicon,etc.MicrostructuresandmechanicalpropertiesofRPWjointwereanalyzedbyopticalmicroscope,micro-hardnesstestandsheartensilemeasurement.ExperimentalresultsindicatethattheRPWjointhasaroundedrectanglenugget,andthesizeislargerthanellipticalnuggetofresistancespotwelding(RSW)joint;thehardnessvalueofRPWjointisevenlydistributed,accordinglythereisnohardbrittlephases;thesheartensilestrengthofRPWjointincreasesby20%incomparisonwithRSWjointunderthesameweldingconditions.
简介:Inearthquakeproneareas,understandingoftheseismicpassiveearthresistanceisveryimportantforthedesignofdifferentgeotechnicalearthretainingstructures.Inthisstudy,thelimitequilibriummethodisusedforestimationofcriticalseismicpassiveearthresistanceforaninclinedwallsupportinghorizontalcohesionlessbackfill.Acompositefailuresurfaceisconsideredinthepresentanalysis.Seismicforcesarecomputedassumingthebackfillsoilasaviscoelasticmaterialoverlyingarigidstratumandtherigidstratumissubjectedtoaharmonicshaking.Thepresentmethodsatisfiestheboundaryconditions.Theamplificationofaccelerationdependsonthepropertiesofthebackfillsoilandonthecharacteristicsoftheinputmotion.Theaccelerationdistributionalongthedepthofthebackfillisfoundtobenonlinearinnature.Thepresentstudyshowsthatthehorizontalandverticalaccelerationdistributioninthebackfillsoilisnotalwaysin-phaseforthecriticalvalueoftheseismicpassiveearthpressurecoefficient.Theeffectofdifferentparametersontheseismicpassiveearthpressureisstudiedindetail.Acomparisonofthepresentmethodwithothertheoriesisalsopresented,whichshowsthemeritsofthepresentstudy.
简介:
简介:Thispaperstudiesconsensusofaclassofheterogeneousmulti-agentsystemscomposedoffirst-orderandsecond-orderagentswithintermittentcommunication.Forleaderlessmulti-agentsystems,weproposeadistributedconsensusalgorithmbasedontheintermittentinformationofneighboringagents.Somesufficientconditionsareobtainedtoguaranteetheconsensusofheterogeneousmulti-agentsystemsintermsofbilinearmatrixinequalities(BMIs).Meanwhile,therelationshipbetweencommunicationdurationandeachcontrolperiodissoughtout.Moreover,thedesignedalgorithmisextendedtoleader-followingmulti-agentsystemswithoutvelocitymeasurements.Finally,theeffectivenessofthemainresultsisillustratedbynumericalsimulations.
简介:Thedispersioncharacteristicsandexcitationmechanismsoftheguidedwavesinmultilayeredplatesarestudiedinthispaper.Firstly,thedispersionequationisobtainedbythepropagatormatrixmethod.Then,thebisectiontechniqueisemployedtofindalltherootsofthedispersionequation.Thedispersioncharacteristicsoftheguidedwavesareinvestigatedandanalyzed.ForthemultilayeredplatesinwhichtheS-wavevelocityincreasesordecreasesfromtoptobottom,itisfoundthatthevelocitylimitsinhighfrequencyofthefirstandhighmodesareequaltotheRayleighwaveandS-wavevelocitiesofthelow-velocitylayer,respectively.ItisalsofoundthatthevelocitylimitsinthehighfrequencyofallmodesareequaltotheS-wavevelocityofthelow-velocitylayerfortheplatewithalow-velocitymiddlelayer.Thenormaldisplacementspectrumofallthemodesexcitedbythenormalforcesourcewithadefinitewidthonthesurfaceoftheplateisalsoinvestigated.ItisprovedthatthedominantmodeisthefirstmodewhentheS-wavevelocityincreasesfromtoptobottomlayerandthedominantmodeisdifferentindifferentfrequencyrangefortheplatewithalow-velocitymiddlelayer.
简介:Brownplanthopper(BPH)isaninsectspeciesthatfeedsonthevascularsystemofriceplants.ToexaminethedefencemechanismofriceplantsagainstBPH,thepathogenesis-relatedgenes(PR1a,PR2,PR3,PR4,PR6,PR9,PR10a,PR13,PR15andPRpha),signalingmoleculesynthesisgenes(AOS,AXR,ACOandLOX),antioxidant-relatedgenes(CAT,TRX,GSTandSOD)andligninbiosynthesis-relatedgenes(CHS,CHIandC4H)wereinvestigatedinaresistantricevariety.AOS,PR6,PR9andPR15genesshowedsignificantlyincreasedrelativeexpressionlevelsat24.38-,19.17-,14.71-,and12.74-foldcomparedtothecontrol.Moderateincreasedrelativeexpressionlevelsofligninbiosynthesis-relatedgene(C4H),pathogenesis-relatedgenes(PR4,PR10aandPRpha),andantioxidant-relatedgene(GST)werefound,whileCHI,LOX,SOD,TRX1andAXRshoweddecreasedrelativeexpressionlevels.Itwasthusclearlyshownthatwound-inducedresponsegeneswereactivatedinriceplantsafterBPHattacksthroughAOSactivation.JasmonicacidsignalingmoleculemayactivatePR6,PR15,GSTandCATsubsequentlyincreasingtheirexpressionforH2O2detoxification.PR6wereexpressedatthehighestrelativelevelamongthePRgenes.ThesegenesthereforehavealsoaconsiderablesynergisticrolewiththeothergenesagainstBPHbyinterferedtheirdigestiontractsystem.