简介：Thestructuralcouplingisacommongeologicalphenomenon.ThestructuraldifferencesbetweeneasternandwesternactivecontinentalmarginsofmodernPacificandbetweenpaleo-Pacificandmodern-Pacificcontinentalmarginsarerelatedtothecharacteristicsandstatusofthesubductingoceanicplate,namely,1.subductingangle;2.changeinsubductingangle;3.subductingvelocity;4.changeinsubductingvelocity;5.subductiondepth;6.horizontaldistancebetweentheleadingedgeofthesubductingplateandthetrench;7.thestructuralformofthesubductingplateatthe670kmboundarybetweentheupperandlowermantle;8.thedisplacementandthedirectionofdisplacementofsubductingplate.Thecontrolandinfluencetowardtheshallow-levelstructuresbythedeep-levelstructuralactivitiesisadetailedrepresentationofthestructuralcouplingonactivecontinentalmargin.Thebasin-maintaincouplingphenomenonisanintracontinentalstructuralcoupling.ThefarfieldeffectofcollisionbetweenIndianplateandEurasianplateresultsintheoccurrenceofintracontinentalA-typesubductionincentralAsia,andtheA-typesubductionisthekeyfactorthatresultsintheatrophyofbasinsandtheformationofmountainsystems.

简介：ThefollowingfourconjecturesaboutstructuralofSATarestudiedinthispaper.(1)SAT∈P^SPARSE∩NP;(2)SAT∈SRTDtt;(3)SAT∈Ptt^bAPP;(4)FPtt^SAT=FTlog^SAT.ItisprovedthatsomepairsoftheseconjecturesimplyP=NP,forexample,ifSAT∈P^SPARSE∩NPandSAT∈Ptt^bAPP,orifSAT∈SRTDttandSAT∩PttbAPP,thenP=NP.Thisimprovespreviousresultsinliterature.

简介：Evolutionarycomputationbasedontheideaofbiologicevolutionisonetypeofglobaloptimizationalgorithmthatusesself-adaptation,self-organizationandrandomsearchingtosolveoptimizationproblems.Theevolutionary-simplexalgorithmisintroducedinthispaper.Itcontainsfloatingencodingwhichcombinestheevolutionarycomputationandthesimplexalgorithmtoovcrcomctheproblemsencounteredinthegeneticalgorithmandevolutionarystrategymethods.Numericalcxpcrimcntsarcperformedusingseventypicalfunctionstoverifythealgorithm.Aninverseanalysismethodtoidentifystructuralphysicalparametersbasedonincompletedynamicresponsesobtainedfromtheanalysisinthetimedomainisprcscntcdbyusingtheevolutionary-simplexalgorithm.Themodalevolutionary-simplexalgorithmconvertedfromthetimedomaintothemodaldomainisproposedtoimprovetheinverseefficiency.Numericalcalculationsfora50-DOFsystemshowthatwhcncomparedwithothermethods,theevolutionary-simplexalgorithmoffersadvantagesofhighprecision,cfficientsearchingability,strongabilitytoresistnoise,independenceofinitialvalue,andgoodadaptationtoincompleteinformationconditions.

简介：Localizednatureofdamageinstructuresrequireslocalmeasurementsforstructuralhealthmonitoring.Thelocalmeasurementmeanstomeasurethelocal,usuallyhighermodesofthevibrationinastructure.Threefundamentalissuesaboutthelocalmeasurementforstructuralhealthmonitoringincluding(1)thenecessityofmakinglocalmeasurement,(2)thedifficultyofmakinglocalmeasurementand(3)howtomakelocalmeasurementareaddressedinthispaper.Theresultsfromboththeanalysisandthetestsshowthatthelocalmeasurementcansuccessfullymonitorthestructuralhealthstatusaslongasthelocalmodesareexcited.Unfortunately,theresultsalsoillustratethatitisdifficulttoexcitelocalmodesinastructure.Therefore,inordertocarrystructuralhealthmonitoringintoeffect,wemust(1)ensurethatthelocalmodesareexcited,and(2)deployenoughsensorsinastructuresothatthelocalmodescanbemonitored.

简介：

简介：Sincetheseventies,worldeconomyhasbeenengagedinadjustmentprinci-pallyinthefollowingthreefields.First,theshiftofeconomicdevelopmentmodefromthatofaggregatequantitativegrowthtothatofquality-effective-ness.Second,thereformofeconomicsystemwithmoreandmorecountriesrealiz-ingmarketeconomy.Third,theeconomygettingmoreopenedaseconomicglobal-izationfurtheravdances.

简介：WithtechnicalassistancefromINBARandtheResearchInstituteofWoodIndustryoftheChineseAcademyofForestry,theconstructionofthePingbianPrimarySchoolwascompletedin2004,wherebambooplywoodpanelsandlaminatedbeamswereusedfortherooftrusses,sheathingboardsandwallpanels.Thisisthefirsttimethatbamboo-basedpanelsareusedforstructuralapplications.

简介：Anewmethodisputforwardforstructuraldamageidentificationbasedonthehomotopycontinuationalgorithm.Anumericalexampleispresentedtoverifythemethod.Thebeamswithdifferentdamagelocationsanddifferentdamageextentsareidentifiedbythismethod.Thenumericalexampleshaveprovedthatthisnewmethodiscapableofeasyconvergence,whichisnotsensitivetotheinitialiterativevalues.Itiseffectiveforaccuratelyidentifyingmultipledamages.Byincorporatingthefiniteelementmethodintothehomotopycontinuationalgorithm,thedamageidentifyingabilityofthenewmethodcanbegreatlyenhanced.

简介：

简介：

简介：Asystemreliabilityestimationmethodforspatialjacketplatformsisdevelopedinthispaper,Thejacketplatformismodeledintothree-dimensionalassemblyofspatialbeamandplateelementsinFi-niteElementMethod(FEM).Thelimitfailurestatescorrespondtocollapseofaseriesofstructuralmem-berswhichareidentifiedbyengineeringdesigncriteria.Inthispaperthefollowingaspectsaretakenintoaccount:thepunchingshearandbuckiingfailuresinmemberfailuremodesforthetubularjointsandtubu-larcolumnsrespectively;incrementalloadingapproachforestablishmentofthesafetymarginequationsofsystemfailure;thealgorithmofenumeratingsignificantfailuremodesforthestructuralsystemsandotherconcepts,suchasthefalsefailuremodeandthevirtuallimitstate.Thefinalworkisdevotedtothereliabili-tyanalysisforapracticaljacketplatformpresentlyputintooperationontheBohaiSea.Thecomputedre-sultsshowsthatmethodsuggestedinthispaperisfeasibleandeffectivefor

简介：

简介：Thestructuralpropertiesofwateratdifferenttemperatureshavebeeninestigatedusingaflexiblewatermodelintheisothermal-isobaricensemble.Withdecreasingtemperature,thetetrahedralityofthedistributionofthewatermoleculesaroundthecentralwatermoleculeisenhanced,andthehydrogenbondsbecomemorelinear.Bymeansofaconjugategradientenergyminimization,dynamicalconfigurationsatvarioustemperatureshavebeenmappedontonearbypotential-energyminima,the50°-60°peak(P1)inthedistributionfunctionoftheO-O-Oangleofatrimerbecomesfarsmaller.HoweverthereappearstobeasmallbutobservabletemperaturedependenceofP1,i.e.thehigherthetemperature,thehighertheP1intensity.

简介：Astructuralgene(750bp),whichcodesforatypeIribosomeinactivatingprotein,trichosanthin,hasbeendesignedaccordingtothecodonusageofhighlyexpressedgeneinE.coliandchemicallysynthesized.Inthesynthesizedgene,twenty-sevenuniquerestrictionsiteswereevenlydispersedwithanaveragedistancebetweentwoadjacentsiteslessthan50bptofacilitateasystematicinvestigationonstructure-functionalrelationshipofthisproteinbysite-directedmuta-genesis.Tosynthesizeit,thewholegenewasdividedintothreelargefragments(EP,PNandNH)whichwereassembledfromseveralchemicalsyntheticoligonucleotidesbyenzymaticmethod.TheassemblyofboththefragmentEPfromsixoligonucleotides(A-F)andthefragmentPNfromfouroligomers(G-J)wascatalyzedbyT4DNAligaseinusingthesinglestrandedDNAmethod[Chen,H.-B.etal,Nucl.AcidsRes.,18,871(1990)].AndfragmentNHwasformedfromthreeduplexesK,LandMbytheclassicaldoublestrandedDNAmethod.Finally,

简介：Thispaperdiscussessomemechanicalconceptsthathavebeenlargelyappliedtostructuralgeologyandtectonics,andaddressestheproblemsandmisunderstandingsinuseofthesemechanicalterms.Thepurposeistostimulatetheinterestsforstructuralgeologistsinusingthemechanicalprinciplesandmethodscorrectlytosolvethegeodynamicproblems.

简介：Purpose:Tostudythecorrelationbetweenfunctionalandstructurallossinchronicglaucoma,asdetectedbyFrequencyDoublingTechnology(FDT)andHeilderbergRetinaTomograph(HRT).MaterialandMethods:60eyesof60patientswitheitherocularhypertensionorchronicopen-angleglaucomaunderwentvisualfieldtestingwithbothstandardautomated

简介：Inthispaper,themainproblemsconcerningreliabilitydesignofoffshoreplatformstructurearedescribedandthegeneralstepsfortheuseofSafetyCoefficientMethodarepresented.

简介：Thispaperwillchseussthegeneralizedvariationalprinetples.whichtheestablishedbythemethedofundeterminedmultipliersinstructures.andanalysthestatiedllyindeterminatetruss.inwhichtheseprincipleswillbeused.Atthesametimewebringasymmetricalmatrixandgivespeeitiesohution.thusalltheinternalforeesofstructuresmaybefound.

简介：

简介：