简介：Silicaaggregateswerepreparedbybase-catalyzedhydrolysisandcondensationofalkoxidesinalcohol.Polyethyleneglycol(PEG)wasusedasorganicmodifier.ThesolswerecharacterizedusingSmallAngleX-rayScattering(SAXS)withsynchrotronradiationasX-raysource.Thestructureevolutionduringthesol-gelprocesswasdeterminedanddescribedintermsofthefractalgeometry.As-producedsilicaaggregateswerefoundtobemassfractals.Thefractldimensionsspannedtheregime2.1-2.6correspondingtomorebranchedandcompactstructures.BothRLCAandEdenmodelsdominatedthekineticgrowthunderbase-catalyzedcondition.

简介：1ScopeThisstandardspecifiestheglossaryanddefinition,marking,shapeanddimension,technicalrequirements,testmethod,qualityappraisalprocedure,packing,label,transportation,storageandqualitycertificationofsilicabrickforhotblaststove.

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简介：ThispaperreviewsthehistoryofdevelopmentandproductionofsilicabricksatLuoyangRefrac-tories(Group)Co.,Ltd,(FormerLuoyangRefrac-toriesFactory).Throughtheimprovementandin-troducingtechnologyfromabroadthecompany'smanagementandqualitystandardonsilicabricksproductionhasreachedahigherlevel.Thephysicalandchemicalspecifications,aswellastheappear-anceofsilicabricksforcokeovens,hotblaststovesandglasskilnshavereachedtheadvancedinterna-tionallevel.NowthecompanyhasbecomeproducingbaseandmainexportingbasevariouskindsofsilicabricksinChina.

简介：TheannualoutputofChina'ssilicabrickamountsuptoover300thousandtons,whichaccountsformorethan70%ofthetotaloutputofsilicabricksintheworld.Besidessatisfyingdomesticmarkets,China'ssilicabrickshavebeenexportedtomanycountriesandregionssuchasJapan,USAetc.Inthispaper,thesituationofsilicabricksproduction,technology,salesandexportinghavebeendescribed.Alsosuggestionsonimprovementofsilicabricksqualityandexporting,corporationwithforeignpartnershavebeenputforwardinordertowinlargermarketsharebothathomeandabroad.

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简介：SmallX-rayScattering(SAXS)experimentusingSynchrotronRadiationasX-raysourcewasusedtodeterminetheaveragewallthicknessofmesoporoussilicaprepardbycondensationoftetraethylorthosilicate(TEOS)usingnon-ionicalkylpolyethyleneoxide(AEO9)surfactantastemplates.Theresultsagreedwiththatofhigh-resolutionTEM(HRTEM)measurement.

简介：Dreippingelectrolytesintosilicasol,gellingreactionwilloccur,Theresearchindicates:thisisacomplicatedphysicemistrycourse,whichconsistsofapre-reactionandapolymerizaion,Theformercontrolsthewholecourse,andinwhichelectroniclayersofthesol'sparticlesbe-comemoreandmorethiner,butwithincresingofthesolconcentration,itscontrolforcewillbediminished,tillthefast-coagulation,thegellingcousebecomeso-controlled,Thelatterisanin-finitepolymericchani-reaction.Theresultofgelatinationistoproduceaverybigplymericmolecule-gel,whichinvolvesinallspace,includesallwater,anditsmolecularweightisin-definitebig.Theresearhalsoindicates:thedy-namiccourseofthegellingcouldbedescribedquantitaivelybyanexperienceformula:lgt=-nlgc+B,Allofthecharacteristicvalueshavedefinitephysicalmeaning,Electronicvalueofthecontrary-inosisthebiggestinfluentialfactor,thenaturesofthecontrary-ionsandthenaturesofthesame-electronic-inoshaveafewinfluentialforcesonthecharacteristicvalues,Thetemperatureincreasingmakesthegellingreactionfast.

简介：Whenasilicaopticalfiberisusedfortransmittingultraviolet(UV)light,theproblemsassociatedwiththedamageandtransmissiondeteriorationofsilicafiberintheUVregionneedtobesolvedinthefabricationprocess.Inthispaper,animprovedsilicafiberfabricationprocesswaspresentedtoenhanceUVtransmission,whichcombinedtheUVpre-irradiationonhigh-OHconcentrationpreformwithheattreatmentwhiledrawingfiber.Theimpactofthestructuraldefectsandcolorcenterswasdiminishedgreatlybythenewmethodoffabrication.Theexperimentalresultsaccordedwiththetheoreticalanalysis,andtransmissionwasimprovedabout0.4-0.7dB/mforwavelengthfrom350to400nm.

简介：适当大小被需要控制钙离子内容并且在好矿物质粒子之中减少相互作用。在这份报纸，闪锌矿/硅石相互作用被希腊语的第六个字母潜在的大小和新奇希腊语的第六个字母潜在的分布(ZPD)学习在钙离子答案的不同集中的测量方法。到分子的学习矿物质表面和原子吸收状态，精力散光谱学(版本)和扫描电子显微镜(SEM)被使用。在矿物质表面上吸附的筹款试剂被相互作用地位分析。结果证明当钙离子集中在溶液高时，筹款试剂的那吸附不是导致的。减少钙离子集中是有效方法在肉减少粒子相互作用。特定的方法是钠碳酸盐的适当数量被增加进使过饱和石膏的答案。矿物质相互作用能被测量ZPD解释。

简介：Asmall-anglex-rayscattering(SAXS)techniqueusingsynchrotronradiationasthex-raysourcehasbeenemployedtocharacterizethemicrostructureofmesoporoussilicapreparedbyone-pottemplate-directedsynthesismethodology.ThescatteringofpuresilicaagreedwithPorod’slaw.thescatteringoforganomodifiedmesoporoussilicashowedanegativedeviationfromPorod’slaw,suggestingthataninterfaciallayerexistsbetweentheporesandsilicamatrix.Itwastheorganicgroupscomprisingtheinterface,asshownby^29Sicross-polarizationmagic-anglespinningnuclearmagneticresonanceimaging(^29SicpMAS/NMR)andFouriertransforminfraredspectroscopy(FTIR),thatcausedthisnegativedeviationofSAXSintensityfromPorod’slaw,andtheaveragethichnessoftheinterfaciallayercouldbededucedfromthisnegativedeviation.Copyright2001johnWileyandSons,Ltd.

简介：Thevariationsinnutrients（molarratios）andchlorophyllaintheJiaozhouBaywereexaminedbeforeandafteradiatombloominaperiodthatlastedfromNovember2003toMarch2004.Negativerelationshipsbetweennutrientconcentrations,Si/P,Si/Nratiosandchlorophyllacontentwerefoundduringthebloom,whichreflectedtherelationshipbetweennutrientconcentrations,phytoplanktonbiomassandgrowth.Largeincreaseinnutrientconcentrations,particularlySiO3-Siafterthelateautumn,isoneofmajorreasonsinducingthediatombloominwinter,andthebloomwasfinallycontrolledduetoSiO3-Sidepletionbyphytoplankton.ThebloomwasmainlycontrolledbySiO3-Si.Before1998,relativelylowlevelofSiO3-SikeptecologicalbalanceofeutrophicationwatersintheJiaozhouBay.Inrecentyears,however,humanactivitieshaveincreasedSiO3-Siconcentration,whichislikelyoneoftheprimarycausefortheincreaseddiatombloomsintheJiaozhouBay.Therefore,itisnecessarytocontrolSiO3-SiconcentrationintheJiaozhouBay.

简介：JC/T616-20031ScopeThisstandardspecifiestheclassification,technicalrequirements,testmethod,inspectionrules,marking,packing,transportation,storageandqualitycertificationofhighqualitysilicabricksforglassmeltingfurnace.Thisstandardisapplicabletothepressedhighqualitysilicabrickswithunitweight≥40kgforglassmeltingfurnace.

简介：Poly(bis(phenoxy)phosphazene)(SPBPP)/phosphotungsticacid(PWA)/silicacompositemembranesforfuelcellswereprepared.ThecompositemembraneswerecharacterizedbyusingFTIR,TGAandSEMtechniquies.IncorporationofPWAparticlesandsilicaparticlesintotheSPBPPpolymermatrixandaspecificinteractionbetweenthemwereconfirmedbyFTIRspectra.TGAresultsshowedthatthecompositemembraneshadhighthermalstability.HomogeneousdistributionofPWAandsilicaparticleswithintheSPBPPmatrixwasverifiedbySEMmicrographs.Thedopedmembranesshowedincreasedwateruptakeandprotonconductivity.

简介：分散硅石的NiMohydrodesulfurization催化剂被免职降水方法综合。为比较目的，体积NiMo催化剂被一起沉淀获得。分散硅石的NiMo催化剂有高度活跃的金属内容。硅石被采用为活跃部件的完整的利用驱散活跃金属。赌注分析证明分散硅石的NiMo催化剂有一个高表面区域(147.0m2/g)和毛孔体积(0.27mL/g)，而体积NiMo催化剂展出了一个很低的表面区域(87.5m2/g)。传播电子显微镜学结果证明活跃部件在SiO2底层上被驱散。分散硅石的NiMo催化剂和体积NiMo催化剂的X光检查衍射模式被索引到NiMoO4。分散硅石的NiMo催化剂的hydrodesulfurization活动比引用催化剂的高得多并且能直到比那些两次大商业NiMo支持氧化铝的系统每催化剂的克。测试结果的活动也证明分散硅石的NiMo催化剂是有效hydrodesulfurization催化剂。

简介：Waveguidingpropertiesofsilicananowiresinvariousenvironmentsarestudiedbysolvingtheeigenvalueequationsofacircularcross-sectionwaveguidenumericallyincylindricalcoordinates.Thesingle-modecondition,propagationconstants,poyntingvectorandpowerdistributioninsideandoutsidesilicananowirearecalculated.Theresultsshowthatsilicananowiresinwater,comparedwithsilicananowiresinair,havehigherfractionoftheevanescentfields.Duetothesensitivitytosurroundingenvironment,silicananowiresareverysuitableforsensingelements,whichcanbeusedtoimplementasingle-modefiberopticevanescentwavesensingelementofhighlysensitiveandaccuratemeasurement.

简介：Ascokeovenbecominglarger,silicabrickforcokeovenisrequiredtobeofhighuqality,LuoyangRefractories(Grop)Co.Ltd.(LRCO)hasre-searchedthemineralizerwhichcontainsCa^2+,R^+,Al^3+,F^-,emphaticallyandproposedtheprincipleofcompositemineralizerbasdonthepropertiesofrawmaterialsused.Highperformancesiliabrickwhichischaracterizedbylowthermalexpansionrate,goodhightemperatureproperties,residualquartz<0.5%,truedensity2.31,andhighbulkdensitysilicabrickforcarbonizationroomwithapparentporosity13%,bulkdensityl.96g/cm^3havebeendevelopedandproducedsuccessfullybyLR-CO.Thequalityofthebrickshasreachedtheinter-nationaladvencedlevel.

简介：Acolloidalsilicasolbondedproductrangeisintroducedbyanexampletargetinghightemperatureapplicationsinsteelmaking.Placementandsettingcharacteristicsareshown.Thethermalmechanicalpropertiesandresultingadvantagesarepresentedaswellastheperformanceenhancementincorrosionresistance.PropertiesarecomparedtoacommonULCCproduct.Resultsoftheindustrialtrialphasearediscussed.