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1.
ThebacteriostaticpotencyofceriumhumicacidcomplexwasevaluatedbyexperimentalstudyonitscomplexreactionwithE.coli,Bacilluspyocyaneus,Staphylococcusaureus,Leuconostocandstreptococcusfaecalis,andbycomparisonofitsbacteriostaticeffectswiththatofceriumcitrat…  相似文献   

2.
Asoneoftheexternalparameterswhichaffectthematerialproperties ,theeffectofmagneticfieldonatomshasbeenstudiedandappliedinmanyareasandmakesmuchprogressinmanysubjects ,suchassolidphysics ,surfacephysics ,andplasmaphysics .ThematuretechnologyMCZinsemiconductor…  相似文献   

3.
Effect of Rare Earth Elements on Quenching Crack Resistance of Steel 9Cr2Mo   总被引:1,自引:1,他引:0  
Rollerforcoldrollingisakeyforgingpart,whichexperiencescontactstress ,alter natingstressandfrictionalstressduringrolling .Therefore ,higherstrength ,surfacehardness,wearresistanceandenoughtough nessshouldbeconsideredformanufacturingthiscoldroller[1] .Sincethe…  相似文献   

4.
Owingtotheexcellentresistancetohightemperaturecorrosion ,aluminizingcoatingshavebeenwidelyusedinvariousindustries ,suchasenergyresources ,transportation ,chemicalprocesses ,aeronauticsandastronau ticsetc .Thetraditionaltechniquestoobtaina luminizingcoatings…  相似文献   

5.
Thereactionofmetaldropletwithslagshasshownthatthemigrationabilityofoxygeninslagiscontrolledbyelectrochemicalfactors[1 4 ] (suchaspresenceofelectronicconductor ,electronicconduc tionofslagphase) .Thereactionsatinterfacebe tweenslagandmetalmeltsareveryimporta…  相似文献   

6.
Rareearthcomplexisanimportantkindoflumi nescencematerials ,muchattentionhasbeenpaidtotheexcellentluminescencecharacteristicsbasedontheirelectrictransitionbetweenthe 4fenergylevels[1,2 ] .Inrecentyearsmanyrareearthcomplexesthatchelatedwithorganiccompounds ,s…  相似文献   

7.
Thedesirableluminescencecharacteris ticsofsomelanthanideionsbasedontheintra f orbitaltransitionshavereceivedmuchatten tion.Rareearthcomplexes,especiallythosecontainingEu3 andTb3 ,oftenexhibitgoodluminescenceowingtothestrongabsorptionoftheorganicligandsand…  相似文献   

8.
Itwasthoughtthattherareearthswerenotcarbideformingelementsbasedonthefactthattherareearthsreactoncarboninsteelsimilarlytosilicon ,theelementwhichneverformscarbideandisdifferentfromtheele mentssuchaschromium ,manganeseandtung stenwhichformcarbides .Moreove…  相似文献   

9.
Inthetwinrollstripcastingprocess ,themechanicalbehaviorofcastingmaterialcangreatlyinfluencerollingforce,whilerollingforceisrelevanttostripsurfacequali ty .Ifrollingforcesurpassesalimitedvalue ,theheattransferfromstriptocastingrollwillbecomeunevenalongstr…  相似文献   

10.
Therearealwayssomegeometricaldiscon tinuities ,suchasfastenerholes ,filletsandgraves ,inpracticalaircraftconstructioncom ponents .Intheviewofmaterialmechanics ,thesegeometricaldiscontinuitiescanbecon sideredasnotches .Stressconcentrationusual lyoccursatnotch…  相似文献   

11.
Metal plasticmultilayercomposites ,whicharecomposedofasteelbacking ,amiddlelay erofsinteredporousbronzeandasurfacelayerconsistingofamixtureofpolytetrafluo roethylene (PTFE)andfillers ,possessmanygoodpropertiesoftheoriginalmetalsandplas tics,suchashighmechan…  相似文献   

12.
Thejoiningoftwosolid metalscanbesuccess fullymadebyweldinginsuperplasticstate ,inwhichthemetalsareactivatedwithlowdeformationstress,high plasticdeformabilityetcthatissuper plasticsolid statewelding .Asanewtechnology ,ithasabrightandattractivefuture ,forexam…  相似文献   

13.
Lanthanideamidecomplexesareanim portantclassofprecursorsforlanthanidederivatives .Itcanbeeasilytransformedtocor respondinglanthanidecomplexbyreactingwithinvolvingproticreagents[1,2 ] .Thelanthanideamideusedassyntheticprecursorisneutralhomolepticcomplex ,oth…  相似文献   

14.
Theaminoacyl tRNAsynthetases (aaRSs)playpivotalrolesinproteinbiosynthesis,whereeachofthe 2 0aaRSsisspecificforoneaminoacidanditscognateisoacceptorsoftRNA .TheinteractionofRE3 withtRNAwasstudiedbythemethodsofnuclearmagneticresonance[1 ,2 ] ,ultraviolet,fluoresce…  相似文献   

15.
Ceramicmaterialshavebeenusedasen gineeringmaterialsbecauseoftheirhighstrengthandhighhardness .Thedisadvantageofsuchceramicsisthedifficultyinmachiningaftersintering ,whichleadstohighmachiningcost.Todecreaseit ,variousceramicswithreasonablemachinability ,ca…  相似文献   

16.
Asanewclassoffunctionalmaterialswithnanometersize ,graphiteintercalationcom pounds (GIC)consistofalkalimetalsoflowionizationpotentialandsubstancesofhighelectronicaffinity ,suchashalogen ,halide ,inorganicandorganicacidsetc[1] .Inrecentyears ,GICattractmuchatt…  相似文献   

17.
Thelanthanidecomplexesoforganiclig andsasfluorescentmaterialshavereceivedex tensiveattention .Theuseoffluorescentorgano lanthanidecomplexesrequirehighfluo rescenceintensityandlowcostcomplexes .Inrecentyears ,thefluorescenceenhancementofTb(Ⅲ )orEu(Ⅲ )complexe…  相似文献   

18.
Asonepracticalapplicationofsurfacemodificationbasedonlasertechnique ,RE laseralloyinghasbeenwidelyinvestigatedandreported[1] .Althoughthetreatmentofsurfacegas phaseREpermeationhasbeenprovedtobeeffectiveonimprovingsurfacehardness ,abrasiveresistanceandcorr…  相似文献   

19.
Heteropolycompoundisanewcatalystwithmanyfunctionsinchemistryindustry .Itsexcellentcatalyticperformanceisdeterminedbyitscompositionandstructure .Ithassimplecompositionandfixedstructure ,althoughitmayconsistofmanyelements .Itsstructureandpropertycanbechang…  相似文献   

20.
Theintermetalliccompoundswithtransitionalbondingfeaturesoftenhaveverycomplexcrystalstructuresanduniquephysicalandchemicalproperties.Owingtotheirpartialdirectionalandpartialsaturationalfeaturesofthebonds,thevalenceruleandtherulesformetalliccompounds…  相似文献   

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