简介:Agriculturalapplicationofrareearth(RE)hasbeengeneralizedforseveraldecades,anditisinvolvedincrops,vegetablesandstockraisinginChina.However,alltheresearchesonREmainlyfocusonthefieldssuchasplantphysiologicalactivity,physiologicalandbiochemicalmechanism,sanitationtoxicologyandenvironmentalsecurity.PlantprotectionbyusingREandtheinducedresistanceofplantagainstdiseasesweresummarized.Themechanismofrareearthagainstplantdiseaseishighlighted,whichincludesfollowingtwoaspects.First,REelementscancontrolsomephytopathogendirectlyandreduceitsvirulencetohostplant.AnotherpossibilityisthatREelementscanaffecthostplantandinducetheplanttoproducesomeresistancetodisease.
简介:Theneedformoreactiveandhydrothermallystablefluidcatalyticcracking(FCC)catalyststocombattheeffectofmetalcontaminantshasledtoanincreaseindemandforrareearthoxides.RareearthoxidesenhancecatalystactivityandpreventthelossofacidsitesduringtheFCCunitoperation,especiallywhenheavyresiduewithhighmetalcontentisusedasfeed.Inthispaper,areviewwascarriedouttoshowtheeffectsofrareearthelementsonthestructure,activity,andstabilityofFCCcatalysts.Also,theuseofrareearthelementsasvanadiumtrapswasanalyzedinconjunctionwiththemechanismofcatalystdeactivationbyvanadium.TheobjectivewastoelucidatetheinteractionofvanadiumspecieswiththezeolitecomponentoftheFCCcatalystsandtheroleofrareearthelementsincounteringthedeleteriouseffectsofvanadiumontheFCCcatalysts.
简介:Thehistoryofthedevelopmentofthetube&pipedivisionofBaosteelwasreviewedinthearticle,focusingontheprocessoftechnicalinnovationandtheproductcategoryenrichment.Thankstothetechnicalinnovation,theφ140productlinehasbecomethemostefficientoneintheworld.Withtheadvanceofconglomeracyandtheconstructionofthemostadvancedweldpipelineandtheφ460premiumqualityfinishing(PQF)line,thecatalogueofBaosteeltube&pipeproductshascoveredtheextensiverangefromthehotrolltocoldroll,theseamlesstothewelded,andalloftheproductdimensionscopefrom25.4mmto610mm.Tomeettherequirementsofrelevantindustriessuchasenergy,transportation,machinery,ammunitionandotherrelevantindustries,theproductvarietyisdivertingfromcarbonsteeltoalloysteel,stainlesssteelandspecialalloys.AstheBaosteelSteelTubingPlantincreaseditsnumberofproductionunits,expandeditsproductioncapacityanddevelopednewproducts,ithasgrownintoapipeandtubesupplierwithglobalcompetitiveness.
简介:Thereisanincreasingtrendforproducingcopper-containingsteels,withcopperbeingeitheraresidualelementfromscrapsoranintentionaladdition,i.e.,inweatheringsteel.Theissueofsurfacehotshortnessoccursduringthehotworkingofsteelscontainingcopper,andasignificantamountofworkhasbeenperformedonthistopic.Thispaperprovidesareviewofrelatedstudiesonthisphenomenon.Theformationmechanism,asanalyzed,istheliquidmetalembrittlementcausedbytheliquidcopperpenetrationintoaustenitegrainboundariesatthemetalsurface,wherethecopperoriginatesfromtheselectiveoxidationofthesteelathightemperature.Onthebasisofthemechanism,moreimportanceisplacedonanalyzingtheeffectonthephenomenonbyvaryingthecontrollingfactors,includingtheheatingprocess,alloyingadditions,anddeformationconditions.Possiblesolutionstotheproblemarefinalized,andsomefurtherworkmustbeperformedinthefuture.
简介:Baosteel's5mheavyplateplantwassuccessfullytestedonMarch1,2005.Sincethen,theHeavyPlatePlantofBaosteel(hereinafterreferredtoas'theplant')hasbeenencouragingitsemployeestostudyandtracetheadvancedheavyplatetechnologies,tryingtofindouttherulesofheavyplateproductionanditsqualitycontrol.TheplanthasgraduallymasteredthismodernheavyplateplantandensuredthatBaosteel'sproductionofheavyplatesgrewyearbyyear,with1.41Mtproductputinstoragein2007.Theplanthasfocusedondevelopingnewtechnologiesandproducts,meanwhileenhancingitscapacity.Ithasproducedaseriesofplateproducts,whichcanbeusedinmanufacturingshiphulls,pipelines,bridges,buildings,boilersandpressurevessels.