简介：N酰--hydroxy-4-phenyl-oxazolidinethiones能被处理很快在高收益变换成他们的乙醇thiol酉旨与在0è的EtSH

简介：Ｋ１，ｋ┐ＦＡＣＴＯＲＩＺＡＴＩＯＮＯＦＢＩＰＡＲＴＩＴＥＧＲＡＰＨＳＤＵＢＥＩＬＩＡＮＧＡｂｓｔｒａｃｔ．Ｉｎｔｈｉｓｐａｐｅｒ，ａｎｅｃｅｓｓａｒｙｃｏｎｄｉｔｉｏｎｆｏｒａｂｉｐａｒｔｉｔｅｇｒａｐｈλＫｍ，ｎｔｏｂｅＫ１，ｋ－ｆａｃｔｏｒｉｚ...

简介：SupposethatCisthecomplexplaneandkisanon-negativeinteger.DefinefunctionsNk-(x)=|x|kifkisevenandNk(x)=x|x|k-1ifkisodd.SomeapproximationpropertiesofNk-(x)’sisdiscussedandanewexampleofaTchebycheffsystemisgivenout.

简介：Let'stakeHasaninfinite–dimensionalHilbertspaceandK(H)bethesetofallcompactoperatorsonH.UsingSpectraltheoremforcompactself–adjointoperators,weprovetheHyers–UlamstabilityofJensen*-derivationsfromK(H)intoK(H).

简介：Wehavefoundthattheexcitedenergyfromthegroundstatewith1f7=2configurationtothefirstexcitedstatewith2p3=2configurationin37SisobviouslylowercomparedwiththatinnearbyN=21isotones35Si,39Arand41Ca(seeFig.1,Theinsertindicatestherelevantsingle-particleorbitsofprotonandneutron).ThisinterestingphenomenonmayresultfromthecollapseofN=28closure,whichgivesthesufficientvalencespaceforcollectivedeformationwhichcanbeenrevealedfromtheB(E2)value.Therefore,toobtaintheB(E2),weperformtheexperimentsformeasuringthelifetimeofthefirstexcitedstatein37S.

简介：

简介：Asimplemethodisappliedtocalculatingtheisotopeshifts(ISs)on5S1/2→4D3/2,5/2transitionsof87,88Sr+.FirstwehavecalculatedtheISsoflowertransitionsonaseriesofalkali-likesystemssuchasB2+,Ca+andBa+,whichareinagreementwithotherworks.ThentheISson5S1/2→4D3/2,5/2transitionsof87,88Sr+,whichareusefultostudytheSr+opticalfrequencystandard,areevaluated.

简介：Theredistributionoftheenergyflowoftightlyfocusedellipticity-variantvectoropticalfieldsispresented.Wetheoreticallydesignandexperimentallygeneratethiskindofellipticity-variantvectoropticalfield,andfurtherexploretheredistributionoftheenergyflowinthefocalplanebydesigningdifferentphasemasksincludingfanlikephasemasksandvortexphasemasksonthem.Theflexiblycontrolledtransverseenergyflowringsofthetightlyfocusedellipticity-variantvectoropticalfieldswithandwithoutphasemaskscanbeusedtotransportmultipleabsorptiveparticlesalongcertainpaths,whichmaybewidelyappliedinopticaltrappingandmanipulation.

简介：TheIncompleteOrthogonalizationMethod(IOM(q)),atruncatedversionoftheFullOrthogonalizationMethod(FOM)proposedbySaad,hasbeenusedforsolvinglargeunsymmetriclinearsystmes.However,theIOM(q)exhibitesirregularconvergencebehaviorwithwildoscillationintheresidualnormsthoughittendstodecreaseinaveryslowmanner,whichisowingtothelackofminimizationpropertyovertheKrylovsubspace.QMRmethodproposedbyFreund,GutknechtandNachtigal,owingtoitsabilitytoavoidbreakdownsandsmoothconvergencebehavior,isarobustiterativesolverforgeneralnonsingularunsymmetriclinearsystems.Inthispaper,weproposeanovelquasi-minimalresidual(QMR)variantoftheIncompleteOrthogonalizationMethod(IOM(q)).Numericalexpermentsshowthatithassmoothconvergencebehaviorandismoreeffective,especiallywhenusingitsrestartedversion.

简介：本文研究了旗传递点数不大于20的2-（v，k，λ）设计的分类，证明了当（r，λ）=1时，在同构意义下只存在18个这样的设计．

简介：MakinguseoftheZ2×Z2symmetry,wecouldstudythestructurenearmultipleS-treakingturningpoints.Inparticular,weshowthatthereexisttwokindsofsingularpointpaththroughdoubleSbreakingturningpointsandtripleSbieakingturningpoints,onetsquadraticturningporntpathandoneisquadraticpitchforkbifurcationpointpath.SomesimpleregularextendedsystemstocornputedoubleandtripleS-breakingturningpointsareproposed.Numericalexamplesarealsogreen

简介：过量臼齿的卷VmEand运动学的粘性为丙烯乙二醇monomethyl醚(1-methoxy-2-propanol)的二进制混合物作为作文的一个函数被测量了，MeOCH2CH(哦)我，丙烯乙二醇monoethyl醚(1-ethoxy-2-propanol)，EtOCH2CH(哦)我，丙烯乙二醇monopropyl醚(1-propoxy-2-propanol)，PrOCH2CH(哦)我，丙烯乙二醇monobutyl醚(1-butoxy-2-propanol)，BuOCH2CH(哦)我，和丙烯乙二醇tert丁基醚(1-tert-butoxy-2-propanol)，t-BuOCH2CH(哦)我与1-butanol臼齿的体积是的过量为系统2-butanol+1-methoxy-2-propanol，和+1-propoxy-2-propanol越过为有1-butanol的所有系统的全部范围ofcomposition否定、积极，为为系统2-butanol+1-ethoxy-2-propanol，和+1-tert-butoxy-2-propanol的系统2-butanol+1-butoxy-2-propanol，和变化符号否定。从试验性的数据，在从xii的动态粘性的偏差被计算了。两过量臼齿的卷和粘性偏差被方法用一个Redlich-Kister类型多项式方程相关为二进制系数和标准错误的评价最少平方。

简介：

简介：我们构造N=从歧管的概括Calabi-Yau的2superconformal顶点代数学(SCVA)并且计算它的联系拓扑的顶点代数学的BRSTcohomology。我们证明BRSTcohomology与概括Dobeaultcohomology与一致。我们证明二拓扑的顶点代数学由A和B扭曲从N=构造了2SCVA分别地是镜子对。

简介：Thenovelcomplex[K(18-C-6)]2[Cd(mnt)2][18-C-6-18-crown-6,nmt=1,2-dicyanoethene-1,2-dithiolate,C2S2-(CN)2^2-]wassynthesizedandcharacterizedbyelementalanalysis,IRspectrumandX-raydiffractionanalysis.Thecomplexdisplaystwo-dimensionalnetworkstructureof[K(18-C-6)]complexsegmentsand[Cd(nmt)2]complexsegmentbridgedbyS-K-S,S-K-NandN-K-Ninteractionsbetweenadjacent[K(18-C-6)]and[Cd(mnt)2]units.

简介：Thecopolymerizationofp-diethynylbenzene（PDEB）withphenylacetylene（PhA）,4,4’-diethynylbiphenyl（DEBP）orm-diethynylbenzene（MDEB）arestudiedbyvaryingmoleratiosofmonomers.WhenthemoleratiosofPDEB/PhAarelessorequalto1/5,thecopolymersaresolubleandfusible,buttheothercopolymersareinsolubleandinfusible.Theresultsshowthatthegoodsolventofcross-linkedcopolymersisbenzeneandtheirsolubilityparameteris9.15cal0.5.cm（-1.5）.Andtheirswellability（θp）,Hugginsparameter（χ）,density(d425)andtheaveragemolecularweightsbetweencrosslinks（c）aremeasured.Itisfoundthatθpandcofcopolymersaregreaterbutd425islessthanthatofrespectivehomopolymers.IRspectrashowthatthecopolymershavetransoidconfigurationandsmallnumberofunreactedethynylgroupsexistinthecopolymers.Themechanismaboutthepolymerizationoracetylenicderivativesinitiatedby（Ph3P）2PdCl2isdiscussed.

简介：Theα-decayofneutron-deficientheavynucleifarfromstabilityisanindispensablespectroscopictooltostudytheirlow-energystructure.220Pa,atrans-leadisotopeneartheshellclosureN=126,itsdecaypropertiesarestillnotwellestablished,thoughitwasstudiedintwoα-decayexperiments30yearsago[1,2].Recently,weappliedsuccessfullythemoderndigitalpulseprocessing(DPP)technique[3,4]tothedecayspectroscopyintheZ≥91andN=128~131region[5]andthedecaychainof220Pawasestablishedatthefirsttime.

简介：高考题（2012年江苏卷第20（2）题）已知各项均为正数的两个数列{an}和{bn}满足an＋1=an＋bn/√an^2＋bn^2,n∈N^＊.

简介：Multi-nucleontransferreactionplaysanimportantroleinthesynthesisofnewnuclides[1].Inthereactionsof20Ne+209Bi,someshort-livednucleiproducedbytransferring26nucleonswerediscovered.Theexperimentof20Ne+209Biwasperformedatgas-filledrecoilseparatorinLanzhou[2].A400g/cm2thick209Bitargetwasbombardedwith20NebeamdeliveredbyacceleratorHIRFL.

简介：Wemeasurethecurrent–voltage(I–V)characteristicsforthesinglecrystalofTl0.4K0.41Fe1.71Se2withthesuperconductingtransitiontemperature(TC)around30.5K,undera10Tmagneticfieldappliedperpendicularandparalleltotheabplane.WefindthattheshapesoftheI–Visothermsareverydifferentfromthedescriptionbythevortex-glass(VG)model.CombiningtheoreticalcalculationsandanalysisoftheρH⊥ab–TandρHab–Tdata,wegiveanexplicitdiscussionoverthesuitabilityoftheVGmodelfortheA0.8Fe2Se2superconductors,andpointoutthepossibilityofthematerialactingasaconvenientplatformforre-examinationandfurtherstudyofthecomplexvortexbehaviorsinthelayeredsuperconductors.