简介:Hydrogelcanswelltomanytimesofitsdryvolume,resultinginlargedeformationwhichisvitalforitsfunction.Theswellingprocessisregulatedbymanyphysicalandchemicalmechanisms,andcan,tosomeextent,befairlydescribedbytheporoelasticitytheory.Implementationoftheporoelasticitytheoryintheframeworkoffniteelementmethodwouldaidthedesignandoptimizationofhydrogel-basedsoftdevices.Choosingchemicalpotentialanddisplacementastwofeldvariables,wepresenttheimplementationofporoelasticitytailoredforhydrogelswellingdynamics,detailthenormalizationofphysicalparametersandthetreatmentofboundaryconditions.Severalexamplesarepresentedtodemonstratethefeasibilityandcorrectnessoftheproposedstrategy.
简介:Thegradingcriterionofblastingclassification,evaluatingindexandthecharacteristicvaluearetakenasmatterelements.First,therelationalfunctionisconstructedaccordingtothegradingcriterion,andthen,thegradeofrockblastingisevaluatedbythecomprehensiverelationaldegree.Theauthorhaspresentedasystemmethodofblastingclassificationofrock.Thepracticalexampleprovesthatitissimpleincalculationandreasonableinevaluation.
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简介:Amajorroleofecologicalriskassessment(ERA)hasbeentoprovidescientificguidanceonwhetherafuturehumanactivitywillcauseecologicalharm,includingsuchactivitiesasreleaseofageneticallymodifiedorganism(GMO),exoticspecies,orchemicalpollutantintotheenvironment.Thisrequiresthedeterminationofthelikelihoodsthattheactivity:wouldcauseaharm,andwouldnotcauseaharm.Inthefirstcase,thefocusisondemonstratingthepresenceofaharmanddevelopingappropriatemanagementtomitigatesuchharm.Thisisusuallyevaluatedusingstandardhypothesisanalysis.Inthesecondcase,thefocusisondemonstratingtheabsenceofaharmandsupportingadecisionofbiosafety.WhilemostERAresearchershavefocusedonfindingpresenceofharm,andsomehavewronglyassociatedthelackofdetectionofharmwithbiosafety,anovelapproachinERAwouldbetofocusondemonstratingdirectlythesafetyoftheactivity.Although,someresearchershavesuggestedthatretrospectivepoweranalysiscanbeusedtoinferabsenceofharm,itactuallyprovidesinaccurateinformationaboutbiosafety.Adecisionofbiosafetycanonlybesupportedinastatisticallysoundmannerbyequivalencetests,describedhere.Usinga20%ecologicalequivalencestandardinGMOexamples,weillustratedtheuseofequivalencetestsfortwo-sampleswithnormalorbinomialdataandmulti-samplenormaldata,andprovidedaspreadsheetcalculatorforeach.Insixoftheeightexamples,theeffectsofCrytoxinsonanon-targetorganismwereequivalenttoacontrol,supportingadecisionofbiosafety.Theseexamplesalsoshowedthatdemonstrationofequivalencedoesnotrequirelargesamplesizes.Althoughmorerelevantecologicalequivalencestandardsshouldbedevelopedtoenableequivalenceteststobecomethemainmethodtosupportbiosafetydecisionmaking,weadvocatetheiruseforevaluatingbiosafetyfornon-targetorganismsbecauseoftheirdirectandaccurateinferenceregardingsafety.
简介:Accordingtothebasicideaofdual-complementarity,inasimpleandunifiedwayproposedbytheauthor,somebasicprinciplesindynamictheoryofelasticmaterialswithvoidscanbeestablishedsys-tematically.Inthispaper,animportantintegralrelationintermsofconvolutionsisgiven,whichcanbecon-sideredasthegeneralizedprincipleofvirtualworkinmechanics.Basedonthisrelation,itispossiblenoton-lytoobtaintheprincipleofvirtualworkandthereciprocaltheoremindynamictheoryofelasticmaterialswithvoids,butalsotoderivesystematicallythecomplementaryfunctionalsfortheeight-field,six-field,four-fieldandtwo-fieldsimplifiedGurtin-typevariationalprinciples.Furthermore,withthisapproach,thein-trinsicrelationshipamongvariousprinciplescanbeexplainedclearly.
简介:Basedonthefundamentalideasconcerningmicrowaveattenuationinplasma,weobtainanewexpressionoftransmissionattenuationofmicrowavesasafunctionoftheincidentwavefrequency.Andwithreasonablehypothesis,analyticalformsoftheelectrondensityandtheelectron-neutralcollisionfrequencyarederivedfromtheequationsofthetransmissionattenuationofmicrowavesattwonearfrequencies.Thismethodgivesaneffectiveandeasyapproachtodiagnosetheunmagnetizedplasma.
简介:Computervisionhascomeintousedinthefieldsofweldingprocesscontrolandautomation.Inordertoimproveprecisionandrapidityofweldingimageprocessing,anovelmethodbasedonfractaltheoryhasbeenputforwardinthispaper.Comparedwithtraditionalmethods,theimageispreliminarilyprocessedinthemacroscopicregionsthenthoroughlyanalyzedinthemicroscopicregionsinthenewmethod.Withwhich,animageisdivideduptosomeregionsaccordingtothedifferentfractalcharactersofimageedge,andthefuzzyregionsincludingimageedgesaredetectedout,thenimageedgesareidentifiedwithSobeloperatorandcurvedbyLSM(LeaseSquareMethod).Sincethedatatobeprocessedhavebeendecreasedandthenoiseofimagehasbeenreduced,ithasbeentestifiedthroughexperimentsthatedgesofweldseamorweldpoolcouldberecognizedcorrectlyandquickly.
简介:碳nanocones有相当迷人的电子、结构的性质,其轴的颤动很少在以前的研究被调查。在这份报纸,基于一个非局部的弹性理论,一个不一致的杆模型被使用在nanocones的轴的颤动上调查小规模的效果和不一致的效果。用修改Wentzel-Brillouin-Kramers(WBK)方法,一个asymptotic答案为一般不一致的nanorods的轴的颤动被获得。用类似的过程,然后,nanocones的轴的颤动为不一致的参数,模式数字和非局部的参数被分析。明确的表情为夹钳夹钳和夹钳免费的边界条件的模式频率被导出。因为对小长度规模的效果的无知,轴的颤动频率被古典杆模型高度过高估计,这被发现。
简介:Inmanydomainsofphysics,methodsfordealingwithnon-perturbativeaspectsarerequired.Here,IwanttoarguethatagoodapproachforthisistoworkontheBoreltransformsofthequantitiesofinterest,thesingularitiesofwhichgivenon-perturbativecontributions.ThesesingularitiesinmanycasescanbelargelydeterminedbyusingthealiencalculusdevelopedbyJeanEcalle.Mymainexamplewillbethetwopointfunctionofamasslesstheorygivenasasolutionofarenormalizationgroupequation.
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简介:AmajorissueinChina'spresentecologicaleconomicconstructionistobuildtheecologicalprovince.InMarchof1999,HainanProvinceofChinaproposedsettingupthefirstecologicalprovinceandwasaccreditedbytheBureauofStateEnvironmentProtectionasthepilotproject.Uptonowforonlyfouryears,Hainan,Jilin,Heilongjiang,Fujian,Zhejiang,Shandong,Anhui,Jiangsu,eightprovincesinthewholecountry,havinglaunchedtheestablishmentoftheecologicalprovince.Meanwhile,theprovincessuchasShaanxi,Hebei,
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简介:TheTwin-LoopAntenna(TLA)hasbeenwidelyusedbecauseofitsbroadbandpropertyandsimplyfeeding,andsomemodifiedstructureshavebeendevel-opedfromitsprototypebyChineseengineers.ButtheexactdesigntheoryforTLAaccord-ingtotheimpedancecalculationhasnotyetbeenpublished.Inthispaper,theimpedanceofloopinaTLAisanalysedandcomputedbyusingthemethodofmoments,andthede-signformulaeandatwo-stepoptimizationprogramforextendingthebandwidthofinputimpedanceofTLAaredetailed.Anexampleofoptimizeddesignshowsthatthebandwidthcanbeincreasedupto36.4%forVSWR≤1.10,whichiswiderthanthebandwidthofra-diationpattern.
简介:ThispaperextendstheTOPSIStofuzzyMCDMbasedonvaguesettheory,wherethecharacteristicsofthealternativesarerepresentedbyvaguesets.Anovelscorefunctionisproposedinordertodeterminethevaguepositive-idealsolution(VPIS)andvaguenegative-idealsolution(VNIS).Wepresentaweighteddifferenceindextocalculatethedistancebetweenvaguevalues,bymeansofwhichthedistanceofalternativestoVPISandVNIScanbecalculated.Finally,therelativeclosenessvaluesofvariousalternativestothepositive-idealsolutionarerankedtodeterminethebestalternative.Anexampleisshowntoillustratetheprocedureoftheproposedmethodattheendofthispaper.
简介:OnSeptember11,2017,theSeminaronChina’sTheoryandPracticeoftheRighttoPeacewasheldatNanjingUniversity.ItwasjointlyorganizedbytheChinaSocietyforHumanRightsStudies(CSHRS)andthePublicityDepartmentoftheCommunistPartyofChinaJiangsuProvincialCommittee,andco-hostedbytheInstituteforInternationalStrategicStudiesattheCentralPartySchoolandtheSchoolofHistoryatNanjingUniversity.Morethan70expertsandscholarsfromuniversitiesandhumanrightsinstitutesinChina,andrepresentativesofrelevantgovernmentalagenciesandsocialorganizationsdiscussedindepthtopicsincluding'ResearchontheBasicTheoryoftheRighttoPeace,''PracticeoftheRighttoPeaceandPeaceinChina,''TraditionalChineseHistoryandcultureandtheRighttoPeace,''PeacefulConstructionofaCommunitywithasharedfutureforMankind,''RighttoPeaceandIrenology,'and'PromotionandDisciplineConstructionofIrenology.'ThisseminarhasnotonlyexpoundedChina’speacefuldevelopmentconceptanditsoutstandingcontributionstoworldpeacefromtheperspectiveofhumanrights,butalsofacilitatedtheconstructionofatheoreticalsystemofhumanrightswithChinesecharacteristics.