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:刻画加权Bergman空间Aα^2(Ω)上的加权复合算子Cφ,Ф的Schatten-p类.
简介:Inthispaper,wepresentanexplicitone-stepmethodforsolvingperiodicinitialvalueproblemsofsecondorderordinarydifferentialequations.ThemethodisP-stable,andoffirstalgebraicorderandhighphase-lagorder.Toimprovethealgebraicorder,wegiveacompositionsecondorderschemewiththeproposedmethodanditsadjoint.Wereportsomenumericalresultstoillustratetheefficiencyofourmethods.
简介:ThepresolarSiCgrains[1]carrytheoriginalstellarnucleosynthesissignature.Theirisotopicanomaliescomparedtothesunarethestrongconstrainsinthesupernovae(SN)modelcalculations.The15N-excessinsomeSiC-ABgrains(12C/13C<10and14N/15N<272)isoneofthechallengesofcore-collapsesupernovae(CCSNe)models[2].Recently,PignataripointedoutthattheentrainmentofH-richmaterialintotheHeshellbeforetheSNexplosionallowsthecoproductionof13C,15Nand26Al,whichprovidesanewproductionscenarioforSiC-ABgrains[2].IntheHeshellnucleosynthesis,the13Cisproducedthrough12C(p,γ)13N(β+γ)13Creaction.The14Nissynthesizedthrough13N(n,γ)and13C(p,γ)reactions.
简介:LetL=L0+VbethehigherorderSchrdigertypeoperatorwhereL0isahomogeneousellipticoperatoroforder2mindivergenceformwithboundedcoefficientsandVisarealmeasurablefunctionasmultiplicationoperator(e.g.,including(-?)m+V(m∈N)asspecialexamples).Inthispaper,assumethatVsatisfiesastronglysubcriticalformconditionassociatedwithL0,theauthorsattempttoestablishatheoryofHardyspaceHpL(Rn)(0<p≤1)associatedwiththehigherorderSchrdingertypeoperatorL.Specifically,wefirstdefinethemolecularHardyspaceHpL(Rn)bytheso-called(p,q,ε,M)moleculeassociatedtoLandthenestablishitscharacterizationsbytheareaintegraldefinedbytheheatsemigroupe-tL.
简介:利用临界点理论研究具有部分周期位势的非自治常p-Laplace系统周期解的存在性.在具有p-线性增长非线性项时,根据广义鞍点定理,得到了系统多重周期解存在的充分条件.
简介:我们学习配对的状态在一大部分在旋转起来和旋转下面费米子分别地被充满到s-和px-orbital乐队的地方,二部件的费密气体在一个各向异性的二维的光格子装载了的imbalanced。我们由于s和pxorbitals的乐队结构的相对倒置显示出那,在一样上在二费米子之间配对的系统帮助Brillouin地区站在一起,与有限center-of-mass动量为状态导致大稳定的政体,即,Fulde-Ferrell-Larkin-Ovchinnikov(FFLO)状态。特别地,二费密什么时候出现,在动量空间是靠近的,嵌套的效果与空间调整稳定-FFLO阶段的一种特殊类型沿着容易掘的x方向。我们在二维的飞机以内为各种各样的方面比率在吝啬地的途径以内畴划零温度的阶段图并且计算Berezinskii-Kosterlitz-Thouless(BKT)转变温度T为不同阶段的BKT。
简介:Accordingtothegoodchargetransportingpropertyofperovskite,wedesignandsimulateap–i–n-typeall-perovskitesolarcellbyusingone-dimensionaldevicesimulator.Theperovskitechargetransportinglayersandtheperovskiteabsorberconstitutetheall-perovskitecell.Bymodulatingthecellparameters,suchaslayerthicknessvalues,dopingconcentrationsandenergybandsofn-,i-,andp-typeperovskitelayers,theall-perovskitesolarcellobtainsahighpowerconversionefficiencyof25.84%.Thebandmatchedcellshowsappreciablyimprovedperformancewithwidenabsorptionspectrumandloweredrecombinationrate,soweobtainahighJ_(sc)of32.47mA/cm~2.Thesmallseriesresistanceoftheall-perovskitesolarcellalsobenefitsthehighJ_(sc).Thesimulationprovidesanovelthoughtofdesigningperovskitesolarcellswithsimpleproducingprocess,lowproductioncostandhighefficientstructuretosolvetheenergyproblem.
简介:Klapper(1994)showedthatthereexistsaclassofgeometricsequenceswiththemaximalpossiblelinearcomplexitywhenconsideredassequencesoverGF(2),butthesesequenceshaveverylowlinearcomplexitieswhenconsideredassequencesoverGF(p)(pisanoddprime).ThislinearcomplexityofabinarysequencewhenconsideredasasequenceoverGF(p)iscalledGF(p)complexity.ThisindicatesthatthebinarysequenceswithhighGF(2)linearcomplexitiesareinadequateforsecurityinthepracticalapplication,while,theirGF(p)linearcomplexitiesarealsoequallyimportant,evenwhentheonlyconcerniswithattacksusingtheBerlekamp-Masseyalgorithm[Massey,J.L.,Shift-registersynthesisandbchdecoding,IEEETransactionsonInformationTheory,15(1),1969,122–127].Fromthisperspective,inthispapertheauthorsstudytheGF(p)linearcomplexityofHall’ssexticresiduesequencesandsomeknowncyclotomic-set-basedsequences.
简介:利用methoxysilyl一半的水解作用和冷凝作用,器官无机的混血儿(N-isopropylacrylamide-co-acrylamide-co-3-(trimethoxysilyl)propylmethacrylate)poly,P(NIPAM-co-AM-co-TMSPMA)microgels经由二个不同方法被准备。第一个方法是microgels是从crosslinkable的fabricated以后线性P(NIPAM-co-AM-co-TMSPMA)terpolymer在terpolymer的更低的批评答案温度(LCST)上面的水的答案。为第二个方法,microgels被常规表面活化剂直接综合NIPAM,AM,和TMSPMA的免费乳剂copolymerization。结果的P(NIPAM-co-AM-co-TMSPMA)microgels的水动力学直径和稳定性强烈取决于microgel的pH和温度水的答案。microgels的水动力学直径与增加测量温度减少了。microgels的阶段转变温度被发现在34附近吗??
简介:Dispersionofmulti-walledcarbonnanotubesinpoly(p-phenylene)compositeexposedtotoluenewasexperimentallyinvestigated.3mgofmulti-walledcarbonnanotubeswithnominalsizeof20nmwascompoundedwith30mgofpoly(p-phenylene)withthepresenceofterpineolasbindinginitiator.Toinvestigateanoptimalconditionforhomogenizingallconstituents,ultrasonicationwithanoutputpowerof750Wwasemployedwithcompoundingtimeof3,10,20and30min.WithFTIRanalyses,itcouldbeconfirmedthathomogeneouscompositeofmulti-walledcarbonnanotubesandpoly(p-phenylene)couldbeprepared.SEManalyseswerealsoconductedtoexaminethedispersionofmulti-walledcarbonnanotubesinthepolymermatrix.Thenintrinsicelectricalresistanceofthecompositesafterbeingexposedtotoluenewasalsoinvestigated.Itwasfoundthatthecompositefilmpreparedwithultrasonicationfor20mincouldprovidesufficientlysensitiveresponsewithrespecttovariedconcentrationoftoluene.
简介:利用概率度量空间中A—proper映射拓扑度的基本性质,在投影完备的Z—P—S空间中研究了非线性映射的不动点问题,得到了一些新的结果.