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1.
Polymerscontainingthiolandsulphoxidewhichhaveactive—SHand—SOgroupswereusedinbiological,pharmaceutical,industrialandotherchemicalfields .As—SHand—SOgroupsareeasytoformcomplexeswithmetals ,sotheyhavearouseanincreasinginterestofmanyauthors .Alargenumberoffu… 相似文献
2.
EffectofFluoridesandCeriumDioxideAdditivesonEPandAntiwearPerformanceofGreaseLianYafeng(连亚锋)(GuangzhouMachineToolResearchInsti... 相似文献
3.
Itwasproved[1] thatrareearthelements(REE)promotethegrowthanddevelopmentofplants ,andincreasetheyieldofcrops .How ever ,theirmechanismarestilllittleknown .ItwasknownthatREEincreasestheactivitiesofsomeenzymesandacceleratestheproceedingofphotosynthesisinplants … 相似文献
4.
Effect of Lanthanum on Rice Growth and Physiological Parameters with Split-Root Nutrient Solution Culture 总被引:3,自引:1,他引:2
Alotofworkhasbeendoneontheeffectofrareearthelementsonplantgrowthandphysiologicalactiv ities .ResultshaveshownthatREEsappliedbyfoliarsprays ,seedtreatmentsoradditiontothesoilsandso lutionmediacanincreasegraincrops ,economiccrops ,andvegetablesby 5 0 %~ 12 % ,8 0 %… 相似文献
5.
Rareearthelements (REEs)areabletoincreaseyieldofcropsandimproveproductquality[1] .Inrecentyears ,REEswerewidelyusedasfertilizerinagricultureinChina[2 ] .Chenetal.[3] reportedtheconcentrationofREEsinvarioussoillayersincreasedsignifi cantlyincomparisonwiththatint… 相似文献
6.
since 1 960s ,theresearchoftheZieglercatalystapplyingtothepolymerizationofacry latehasbeenincreasing[1~ 3] ,forexamplethepolymerizationofacrylatewithzirconiumorrareearthcatalystshasbeenpublished[4~ 6 ] .However ,thepolymerizationmechanismoftheacrylatewiththetrans… 相似文献
7.
Inthepastfewyears ,themagneticprop ertiesofcomplexescomprisinglanthanideandtransitionmetalionshaveattractedincreasinginterest[1~ 6 ] .Thesecomplexesareimportantinthestudiesofmagneticexchangeinteractionbetweenlanthanideandd transitionmetalions,andtheycanpro… 相似文献
8.
Rareearthsandtheircompoundshavealotofoutstandingpropertiesandarepaidincreasingattentionto.NumerousinvestigationsfortheternarysystemRENiSnhavebeendone.ThecrystalstructuredeterminationofthecompoundCeNi5Snbyreciprocallatticephotographyhasbeenreportedw… 相似文献
9.
Polyεcaprolactoneisofgreatinterestformedicalapplicationsbecauseoftheirbiodegradability,biocompatibilityandpermeabilitytomanydrugs.Increasingattentionispaidtoexplorelanthanidecomplexassinglecomponentcatalystsforringopeningpolymerizationofεcaprolactone.… 相似文献
10.
CellcultureofTaxusspp .maybeviewedasapotentialalternativetowholeplantextrac tionasasourceoftheantineoplasticagenttax olandrelatedtaxanes ,currentlyinshortsup ply .Therefore ,howtoincreasetheproductivi tyoftaxolintheplantcellculturehasdrawnmuchattention .Eli… 相似文献
11.
Methanationcatalystisanimportantoneinfertilizerandpetroleumindustry .SupportedNi basedcatalystisoneofthesekindsofcata lystsbeingstudiedmostly .Inrecentyears ,peoplehavefoundthattheadditionofrareearthoxidescaneffectivelyincreasetheperfor mancesofmethanati… 相似文献
12.
areearthshaveabeneficialeffectsonpromotingthecropgrowthandincreasingitsyield .Someresearchershavedemonstratedthattherareearthscannotentertheprotoplastandonlystayoutsidetheplasmamembrane[1] .Thereisanoxidation reduction (redox)systemontheplasmamembraneofpl… 相似文献
13.
Study on Electro-Capillary Oscillation in ESR System 总被引:1,自引:0,他引:1
nterfacebetweenmetalpoolandslagpoolstronglyoscillatewhenanalternatecurrentpassingtheinterfaceduringtheprocessofelectroslagremelt ing .Thisphenomenonissocalledelectro capillaryoscillation[1] .ЕсинОАetalthoughtthatelectro capillaryos cillationstrengthensrea… 相似文献
14.
Rareearthelementsareusedwidelybe causeoftheirspecialelectrical,magneticandopticalnatures .Withthehigh speeddevelop mentofmodernscienceandtechnology ,theneedforrareearthswithhighpurityisincreas ing .Soitisveryinterestingtostudythesepa rationandpurificationo… 相似文献
15.
Itwasthoughtthattherareearthswerenotcarbideformingelementsbasedonthefactthattherareearthsreactoncarboninsteelsimilarlytosilicon ,theelementwhichneverformscarbideandisdifferentfromtheele mentssuchaschromium ,manganeseandtung stenwhichformcarbides .Moreove… 相似文献
16.
Itwasprovedbypreviousworks[1] thatrareearthelementspromotethegrowthandde velopmentofplantsandincreasetheyieldofcropsatlowconcentration ,butwhenthecon centrationishigh ,theywillinhibitthegrowthofplants .Itwasalsoproved[2 ,3] thatrareearthelementsexhibitbothpos… 相似文献
17.
Preparation of MachinableY—TZP/LaPO4 Composite Ceramics byLiquid Precursor Infiltration 总被引:1,自引:0,他引:1
Ceramicmaterialshavebeenusedasen gineeringmaterialsbecauseoftheirhighstrengthandhighhardness .Thedisadvantageofsuchceramicsisthedifficultyinmachiningaftersintering ,whichleadstohighmachiningcost.Todecreaseit ,variousceramicswithreasonablemachinability ,ca… 相似文献
18.
Inrecentyears ,thedemandforhighercleanli nesssteelhasbeen greatlyincreased .Alargeamountofhighqualitysteelrequiresthephosphoruscontentlowerthan 0 .0 15 % .Thephosphoruscon tentinsomespecialsteeltypes ,forexample ,steelpipeforlowtemperature ,specialdeep drawingste… 相似文献
19.
Seedsearlydegeneratedoragedbyun suitablecultivationorunstoragetechniquesmayresultindecreasingofseedvigorandofthecropsoutput,especiallyforrice.Rareearthsacceleratethegerminationandgrowthofthecrops ,suchasrice ,wheat,barley ,veg etablesandoilplants[1~ 3] .Thest… 相似文献
20.
Twinrollstripcastingisregardedasaprospec tivetechnologyofnearnetshapecontinuouscastingwhichisusedtoproducestripsof 1 6mm .Present ly ,thistechnologyisbecomingmaturedandcom mercialized .Thekeyproblemishowtoensurebothstrip qualityandsmoothoperation .Areasonabl… 相似文献