简介:采用2步水热法合成了LaPO4∶Eu3+-Fe3O4复合材料.在LaPO4∶Eu3+-Fe3O4复合材料中,LaPO4∶Eu3+为单斜晶相,呈纳米棒状,纳米棒的直径和长度分别为20-100nm和0.2-1μm;Fe3O4为正交晶相、呈20-30nm的颗粒状,Fe3O4粒子紧紧附着在LaPO4∶Eu3+纳米棒的表面;样品的磁性和发光性质研究表明所合成的LaPO4∶Eu3+—Fe3O4复合材料既具有发光性质又具有磁性.
简介:在考虑材料烧蚀时参数变化及蜂窝夹芯传热能力变化的情况下,给出了激光烧蚀蜂窝夹芯复合材料的计算模型,并实验验证了模型的合理性。以碳纤维/环氧树脂-nomex蜂窝夹芯一玻璃纤维/环氧树脂复合材料为例,编程计算了材料的激光烧蚀过程,并以背表面温度为目标物理量进行了参数敏感性分析。计算结果表明,热导率及材料发射率是高敏感参数,热导率与背表面温度正相关,材料发射率与背表面温度负相关,激光功率密度越高,热导率及材料发射率的温度敏感度越高;纤维的升华可降低材料升温速率;对耐高温的蜂窝材料,激光烧蚀过程计算中,不仅要考虑背表面温度,还需要考虑热辐射功率密度。
简介:从SiCp/Al复合材料性能分析着手,讨论了预置件法、焊接法和粘接法等在空间遥感器研制中常用的联接方法的优缺点,提出了在高体积分数(体分)SiCp/Al复合材料上直接加工螺纹,并加装钢丝螺套的方法来改善螺纹联接性能。对在某高体分SiCp/Al复合材料上加工的M4、M5螺纹进行了拉伸测试,结果表明:加装钢丝螺套前,复合材料螺纹有被拉脱现象;加装钢丝螺套后,M4螺纹、螺杆在3000~4000N被拉断;M5螺纹、螺杆在8000~9000N被拉断,测试后两种规格的螺纹状态良好,可以满足实际应用对该材料拉伸强度的要求,其已应用于工程项目中。
简介:Itiswellknownthateveryprimeidealminimaloveraz-idealisalsoaz-ideal.TheconverseisalsowellknowninC(X).ThuswheneverIisanidealinC(X),thenI~(1/2)isaz-idealifandonlyifIis,inwhichcaseI~(1/2)=I.Weshowthesamefactforz~o-idealsandthenitturnsoutthatthesumofaprimaryidealandaz-ideal(z~o-ideal)inC(X)whicharenotinachainisaprimez-ideal(z~o-ideal).Wealsoshowthateverydecomposablez-ideal(z~o-ideal)inC(X)istheintersectionofafinitenumberofprimez-ideals(z~o-ideal).Somecounter-examplesingeneralringsandsomecharacterizationsforthelargest(smallest)z-idealandz~o-idealcontainedin(containing)anidealaregiven.
简介:Twooxo-vanadium(IV)complexes,[VO(C2O4)(2,2′-bipy)(H2O)]·C2H5OH(1)andVO(C2O4)(phen)(H2O)(2),where2,2′-bipy=2,2′-bipyridyl,phen=1,10-phenanthroline,weresynthesizedaspotentialfunctionalmodelsofvanadiumhaloperoxidases(VHPOs)inmixedsolventofethanolandwateratroomtemperature.Thecomplexeswerecharacterizedbyelementalanalysis,infrared(IR),UV-VisandX-raycrystallography.Structuralanalysesshowedthatvanadiumatomwascoordinatedbyaterminaloxygen,oneoxygenatomfromcoordinatedwater,twooxygenatomsfromthecarboxylategroupofoxalicacid,andtwonitrogenatoms(N1andN2)from2,2′-bipy/phen.Centralvanadiumatomsincomplexes1and2werebothinadistorted-octahedralenvironment,andsomeintermolecularhydrogenbondinglinkageswerealsoobservedineachcomplex.BrominationreactionactivityofthetwocomplexeswasevaluatedwithphenolredasorganicsubstrateinthepresenceofH2O2,Br-andphosphatebuffer,indicatingthattheycanbeconsideredasapotentialfunctionalmodelofVHPO.Inaddition,thermalanalysiswasalsoperformedanddiscussedindetail.
简介:Thecrystalandmolecularstructuresof[(C3H7O)2PS2]2(CCDCNo.217201)weredeterminedbymeansofX-raycrystallography.ItcrystallizedinatriclinicsystemwithspacegroupP1^-andlatticeparametersa=0.82794(3)nm,b=0.84764(2)nm,c=0.85034(3)nm,α=97.78(3)°β=110.77(3)°,γ=94.95(3)°,V=0.54701(9)nm^3,Z=1.Inthismolecule,thetwodiisopropyldithiophosphategroups,[(C3H7O)2PS2]2,whichareparalleltoeachother,arelinkedbyanS--Sbondandthereexistinversioncentersinthemolecule,Inthestructure,theP=Sbondsinthetwodithiophosphateunitsaretrans-orientedtoeachother.
简介:Tomeettherequirementsofelectronicvehicles(EVs)andhybridelectricvehicles(HEVs),thehighenergydensityLiNi0.8Co0.15Al0.05O2(NCA)cathodeandSi–Canodehaveattractedmoreattention.HerewereportthethermalbehaviorsofNCA/Si–Cpouchcellduringthecharge/dischargeprocessesatdifferentcurrentdensities.ThetotalheatgenerationsarederivedfromthesurfacetemperaturechangeduringelectrochemicalLi+insertion/extractioninadiabaticsurrounding.Thereversibleheatisdeterminedbytheentropiccoefficients,whicharerelatedwithopen-circuitvoltageatdifferenttemperatures;whiletheirreversibleheatisdeterminedbytheinternalresistance,whichcanbeobtainedviaV–Icharacteristic,electrochemicalimpedancespectroscopyandhybridpulsepowercharacterization(HPPC).Duringtheelectrochemicalprocess,thereversibleheatcontributeslessthan10%tototalheatgeneration;andtheheatgeneratedinchargeprocessislessthanthatindischargeprocess.Theresultsofthermalbehaviorsanalysesareconducivetounderstandingthesafetymanagementandpavingthewayforbuildingareliablethermalmodelofhighenergydensitylithiumionbattery.
简介:为了明确团聚现象及表面性质对ZnS纳米材料发光性质的影响,采用SiO2对ZnS材料进行了表面修饰,并对ZnS及ZnS/SiO2复合材料的光学性质进行对比研究。采用吸收光谱分析了包覆前后光吸收性质的差异,发现SiO2包覆后ZnS纳米材料的带边由333nm红移至360nm。为了研究ZnS纳米材料与ZnS/SiO2纳米复合材料的光发射性质,分别对含纳米材料的水溶液样品及粉末样品的发光光谱进行了采集。对比研究的结果表明,SiO2包覆后ZnS纳米材料在蓝紫光区的发光得到了明显增强。以氙灯作为激发光源所获得荧光光谱显示ZnS/SiO2粉末样品发光的积分强度增大为原来的17.5倍,但相同条件下针对溶液样品的测试结果显示其发光强度只增大了1.1倍,这种增强可用SiO2的存在抑制了ZnS纳米粒子间的团聚来解释,且这一推断由325nm紫外激光激发下获得的光致发光数据进行了验证。