简介：Thetechnologyofactivationbyaddingfewactivators(<1%)toincreasetheamountofblendsincementwasinvestigated.Theresultsshowthatouteractiva-tionhasaremarkableeffectonimprovingthephysicalpropertiesofslagcement,flyashcementandvolcaniccement.Forexample,thecompressivestrengthwasincreasedby5-10MPa.Morever,theapplicationofactivationisbeneficialtogrind-aiding,earlystrengthandwater-reducingetc.

简介：Byanalogueexperimentofexhaustgas,thesensitivecharacteristicsoftitaniatoair/fuelratiowasinvestigated.Theeffectsofsomeimpuri-tiesontheelectricconductivityofTiO2,thedeviationof（A/F）cfrom（A/F）sinnonequilibriumgassystemandtheself-catalyticoxidationofTiO2wereexplainedrespectively.Theeffectsofca-talyst,porosityandthicknessofsensorelementontheresponsetimewasalsoanalyzed.

简介：LeachingexperimentsonmetakaolinshowthatthefinalAlextractionratioreachedinabatchreactionisstrikinglyinfluencedbytheinferiorporestructuregeometryofthemetakaolinpellets.Bycalciningkaolinparticlesadheredinlowhumiditystate,avarietyofmetakaolinpellet,insidewhichalargeopeningsstructuredeveloped,hasbeenprepared.Thestructureremarkablybenefitsleachantiontransference,so,thevarietyhashighacidleachingreactivity,evencoarseasthepelletsare,itsaluminumextractedratiostillhasalinearrelationshipwithleachingtime,andtheleachingkineticsismaintainedzeroorderuptoasignificantconversiondegree.ArevisedPellet-ParticleModelhasbeendevelopedtointerpretthestructureinfluenceonAlextractionratio.

简介：Inthispaperforsavingenergytwodifferentburningmethodsofcementclinkerformationhavebeenstudied.Oneistherapidburningmethodandtheotherisordinaryburningmethodsimulatingrotarykiln,andtheyarecomparedbythekineticpointofview.Theresultrevealsthattheactivationenergyofrapidburningismuchlowerthanordinaryburning.Forlookingintothecause,themainrawmaterial—limestonewasburntbythesametwomethodsandthestructureofproductCaOhasbeendetected.ItcanbefoundthatthemicrostructureofCaOproducedbyrapidburningislooser;latticesconstantsaregreater;crystaldefectsaremoreandparticlesizeissmallerthanthatproducedbyordinaryburning.Thesecausethechemicalreactionmoreactive.Sotheactivationenergyofclinkerformationofrapidburningismuchlowerthanthatoftheordinaryburning.

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简介：Fibrestressofglassfibrereinforcedpolymericcopmositesonloadisdeterminedbyusingopticalfibreasmodelfiberandbymeansoflaserinterferencemethod.Inaddition,theoriginationoffibrestressduringmouldingprocessofcompositesandtherelationbetweenfiberstressofloadedcompositesandexternalstressareexamined.Theexperimentsshowthatfibrestressisrelatedtomolecularstructureofinterfacialmaterialsandstructureofinterfaciallayers.Whenstressistransferredfrommatrixtofibre,eachinterfaciallayerhasdifferentstressgradientanddeformability.Thispropertycanbecharacterizedbyintroducinganinterfacialstresstransfercoefficientktothetwo-phasemodel.

简介：ThesecondaryhardeningreactionisaccompaniedwithprecipitationoffinecarbidesinhighCoNiultrahighstrengthsteel.Thecrystalstructureoftheprecipitatingcarbidesisunambiguouslydeterminedbymicrobeamdiffractionintransmissionelectronmicroscopy.Itisidentifiedthattheneedle-shapedcarbidesareM2Cwithahexagonalstructure.TheconcentrationofsubstitutionalalloyingelementsinthecarbidesquantifiedbyenergydispersiveX-rayspectroscopy(EDS)alsosupportstheresultabove.ThespatialstructureofM2CisidenticalwithL'3type.Metalatomsareinaclosepackedhexagonalstructure,thecarbonatomspartlydistributewithrandomintheoctahedralintersticesandthefillingprobabilityislessthan1/2.Particularattentionwaspaidtotherelationshipofneedle-shapedcarbides/ferritematrixatsecondaryhardeningpeaktemperedat482℃for5h.Observationbyhighresolutiontransmissionelectronmicroscopy(HRTEM)confirmsthatcarbideswithblack-whitecontrastarefullycoherentwithferriteandhaveindividualcrystalstructure,andthecoarsenedcarbideswithmoirefringearepartiallycoherentwithmatrix.TheorientationrelationshipbetweenM2CandferritematrixisdirectlyobservedandidentifiedwiththewellestablishedP-Srelationship[001]α//[111]c.

简介：Bycalculatingtheelectronstructuresofthephasesthatphosphor,sulfurandalloyingelementsdissolvinginγ-Fe,thereasonwhyalloyingelementscanbringcenterlinesegregationincontinuouscastingslab(CCS)withnA,thenumberofelectronsonthestrongestcovalentbonds,andthestructureformationfactorSwereinvestigated,andanelectronstructuralcriteriontocontrolandtoeliminatethecenterlinesegregationwasadvanced.Basingonthis,theelectronstructuresofapartofrareearthphosphidesandsulfidesarecalculated,thephysicalmechanismthatrareearthelementscancontrolthesegregationofphosphorandsulfurisanalyzed,andthecriterioniswellverified.

简介：用碳纤维在弯曲加强的七根增强的水泥(RC)横梁增强了表使遭到了到不同支撑的聚合物(CFRP)负担被测试。起始的负担的效果；加强的RC横梁的最终的力量上的负担历史被外部地结合的CFRP表检验。主要试验性的参数包括了在加强的时候支撑负担的不同层次，；装载历史。试验性的结果显示出那在加强的时候支撑负担层次在加强的RC横梁的最终的力量上有重要影响。如果起始的负担是一样，与CFRP表加强的RC横梁的最终的力量是几乎一样不管负担历史在加强的时候。

简介：Sheetmetalformingiswidelyappliedtoautomobile,aviation,spaceflight,ship,instrument,andapplianceindustries.Inthispaper,basedonanalyzingtheshortcomingofgeneralfiniteelementanalysis(FEA),theconceptionofparametricfiniteelementanalysis(PFEA)ispresented.Theparametricfiniteelementanalysis,artificialneuralnetworks(ANN)andgeneticalgorithm(GA)arecombinedtoresearchthoroughlyontheproblemsofprocessparametersoptimizationofsheetmetalforming.Theauthorprogramstheoptimizationschemeandappliesitinaresearchofoptimizationproblemofinsidesquareholeflangingtechnologicalparameters.Theoptimizationresultcoincideswellwiththeresultofexperiment.Theresearchshowsthattheoptimizationschemeoffersagoodnewwayindiedesignandsheetmetalformingfield.

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简介：Withtheaidofthelatestfiberopticsensingtechnology,parametersinthecureprocessofthermosettingresin-matrixcomposite,suchastemperature,viscosity,voidandresidualstress,canbemonitoredentirelyandefficiently.Inthispaper,experimentresultsofviscositymeasurementincompositecureprocessinautoclaveusingfiberopticsensorsarepresented.Basedonthesensedinformation,acomputerprogramisutilizedtocontrolthecureprocess.Withthistechnology,thecureprocessbecomesmoreapparentandcontrollable,whichwillgreatlyimprovethecuredproductsandreducethecost.

简介：Theimplantedionrange,thedepthprofileandthefilmsttuctureoftheimplantedlayerwerestudied;thecarrierconcentrationandthemobilityweremeasured;theconductivitymechanismofthefilmimplantedFeintoAl2O3ceramicwasdiscussed.TheconclusionisthattheimplantedFe2+ionsmoveintoAl2O3latticeandreplaceAl3+toformsubs-titutionimpuritiessothattheionimplantedlat-tice,ascomparedwiththeoriginalone,presentsaneffectivenegativechargewhichformsanegativechargecenter.Avacancyisboundarroundit,andanacceptorisintroducedintheforbiddenband.

简介：Tostudytheosteogenicabilityoftissue-engineeredboneconstructedbycompoundingzinc-sin-teredbovinecancellousbonewithrabbitmarrowstromalcells(MSCs)invivo,thezinc-sinteredbovinecancellousboneofbeta-tricalciumphosphate(TCP)typewaspreparedbysinteringthefreshcalfcancellousbonetwiceandthenloadingitwithzinc-ion.TherabbitMSCswerecultured,inducedandseededontothezinc-sinteredbovinecan-cellousbones.Thetissue-engineeredboneswerethenimplantedintotherabbits'bockmuscles.Thenewlyformedbonetissueswereobservedbyhistologicalmethodsandtheareasofnewosseoustissuesweremeasuredattheendofthe4thand8thweek.Thezinc-sinteredbovinecancellousbonesalonewereimplantedontheothersideascontrol.TheosteogenicactivityofMSCswasidentifiedbyalkalinephosphatase(ALP)stainingandcalcificationnodchi-nalizarinstaining.Attheendof4thweek,asmallamountofnewbonetissueswasobserved.Attheendof8thweek,thereweremanynewlyformedbonematuretissues.Moreover,theareaofthelatterwassignificantlylargerthanthatoftheformer(P＜0.01),whileinthecontrolgrouptherewasnonewboneformation.Thetissue-engi-neeredbone,whichwasconstructedbycombiningzinc-sinteredbovinecancellousbonewithMSCs,hassatisfactoryosteogeniccapabilitiesinvivo.

简介：Anovelsolubleπ-conjugatedpolymer,poly[(3-acetylpyrrole-2,5-diyl)p-(N,N-dimethylamino)azobenzylidene](PAPDMAABE),wassynthesizedbycondensationof3-acetylpyrrolewith4-aldehyde-4'-dimethylaminoazobenzene(ADMAA).ThechemicalstructureofPAPDMAABEwascharacterizedbyFouriertransforminfraredspectroscopy(FTIR),1H-NMR,andUV-Vis-NIRspectra.Transmissionelectronmicroscope(TEM)analysisforPAPDMAABEindicatesthatpartofPAPDMAABEisincrystalstate,duetotheshort-rangeorderofthepolymer.Thermogravimetricanalysis(TGA)curveshowsthatthepolymerhasgoodthermalstabilityanditsdecompositiontemperatureis248℃.TheopticalbandgapofPAPDMAABEobtainedfromtheopticalabsorptionspectrumisabout1.73eV.Theresonantthird-ordernonlinearopticalpropertyofPAPDMAABEat532nmwasstudiedusingdegeneratefour-wavemixing(DFWM)technique.Theresonantthird-ordernonlinearopticalsusceptibilityofthepolymerisabout7.48×10-8esu.

简介：Withpositronannihilationradiationonedimensionangular-correlationdevice,itismeasuredthatpositronannihilationradiationonedimensionangular-correlationcurvesofpolycrystalsodiumionconductorNa5Y1-xCrxSi4O12（NYCS）system.Afterelectronmomentumdistributioncurvesarenormalized,linearparametersarecalculated.TheparametersH,WandSshowthechangeofNa+ionvacancyconcentrationinNYCSseriessamples.TheresultsshowthatparametersH,WandSofonedimensionangular-correlationcurvesofthosesamplesvarygreatlywithCr2O3contents.WithCr2O3contentincreasing,HandSparametersincrease,butWdecreases,andreachesextremesatx=0.05;thenwithCr203addingcontinually,parametersHandSdecreasegradually,parameterWincreasesgradually.Thisshowsthat,inaddtiontoCr2O3,theconductivityhascloserelation