简介：Apracticalprotocoltoobtain1,1'-binaphthyl-2,2'-diaminewasdevelopedfrom2-naphtholand2-naphthylhydrazineundermildconditions:solvent-free,125-130℃,atmosphericpressure.Theconvenientproceduremakestheprocessamenableforlarge-scalesynthesisoftheversatilecompound.

简介：WeuseamodifiedBecke-JohnsonexchangeplusalocaldensityapproximationcorrelationpotentialwithinthedensityfunctionaltheorytoinvestigatetheelectronicstructuresofHg1-xCdxTeandIn1-xGaxAswithxbeing0,0.25,0.5,0.75,and1.Forbothofthetwoseries,ourcalculatedenergygapsanddielectricfunctions（realpartε1andimaginarypartε2）areinagreementwiththecorrespondingexperimentalresultswithxbeingbetween0and1.Thecalculatedzero-frequencyrefractiveindexvariesgreatlywithxforHg1-xCdxTe,butchangeslittlewithxforIn1-xGaxAs,whichisconsistentwiththerealpartsoftheirdielectricfunctions.Therefore,thisnewapproachissatisfactorytodescribetheelectronicstructuresandtheopticalpropertiesofthesemiconductors.

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简介：New[1+1]and62-membered[2+2]Schiffbasemacrocyclescontaininga2,6-diamidopyridinesubunithavebeensynthesizedbycondensationreactionoftheprecursorspyridine-2,6-dicarboxamideand1,10-bis(20-formylphenyloxy)decaneinthepresenceofphosphoricacidviaaone-potprocess.Thecyclocondensedproductswereeffectivelyisolatedbygelcolumnchromatographyandcharacterizedby~1HNMR,FTIR,massspectrometryandX-rayanalysis.Thetwomacrocycleshaveatwistedstructure,andnotanopen‘circular’conformationinthesolidstate.

简介：The1,1'-binaphtholbasedoligomers3and7with3,3'-acetylene-phenylene-acetylenespacerwerepreparedfromBINOL1.ThehighopticalrotationvalueandCDspectrademonstratedthemainchainchiralityoftheoligomermolecule.TheUV-VISandfluorescentspectraevidencethecharacteristicsofconjugatedstructure.Incomparisonwitholigomer2bearing3,3'-acetylenespacer,theoligomers3and7havelongerefficientconjugationsegment,andtheirfluorescentquantumyields(φ)increased(0.60-0.65versus0.14).Extendingtheeffectiveconjugationsegmentwouldimprovethephotophysicalpropertiesofchiralconjugatedpolymers.``

简介：数列{(1+1/n)~2}的极限是数学上最重要的极限之一,关于它的存在性的证明方法已有多种,参见文[1]、[2]、[3],本文提供这个极限存在性的两种证法,并且给出用常用对数的工具计算e的近似值及进行误差估计的初等方法。

简介：Newmodelcompound1H,1′H-Bis（benz-Δ^4-imidazoline)2,2′-spiro-titaniumdichloridewaspreparedandthestructureofthecompoundwasdeterminedby1R,MSandelementaryanalysis.

简介：ThenumberA（d1,…,dn）ofsolutionsoftheequation0（mod1）,0

简介：WeinvestigateindetailtheeffectsofR-parityleptonnumberviolationonthedecay~↑b1→b~↑x1^0intheR-parityviolatingminimalsupersymmetricstandardmodel(Rp-MSSM)underthepresentexperimentalconstraintsonRpparameters.Inournumericalcalculationsweconsidertwocasesofinputparametersofthesquarkandsleptonsectors,MsquarkMslepton,forcomparison.TheresultsshowthattherelativeR-parityviolatingcorrectionisnotverysensitivetothemassofthelightestneutralino-0↑x1andthedegenerateR-parityviolatingcouplingparameterλ2′,butstronglydependsonMsquark,Mslepton,tanβandthedegenerateR-parityviolatingcouplingparameterλ1′.Therelativecorrectionisabout-4～3%andcanexceed-6%insomeregionofparameterspace.Therefore,preciseexperimentanalysesonthedecay~↑b1→b~↑x1^0mayprovideaprobeoftheR-parityviolation.

简介：运用算子半群理论证明了M/M/1排队模型的l^1动态解的稳定性和正等距性。

简介：ＳＹＮＴＨＥＳＩＳＡＮＤＡＮＴＩ－ＨＵＭＡＮＩＭＭＵＮＯＤＥＦＩＣＩＥＮＣＹＶＩＲＵＳ－１（ＨＩＶ－１）ＡＣＴＩＶＩＴＹＯＦ９－（２－ＰＨＯＳＰＨＯＮＹＬＭＥＴＨＯＸＹＥＴＨＹＬ）ＡＤＥＮＩＮＥ（１）ＡＮＤＩＴＳＲＥＧＩＯＩＳＯＭＥＲ３－（２－ＰＨＯ...

简介：TwopossiblereactionmechanismsofVS~+(~3∑~-,~1Γ)withCOinthegasphasehavebeenstudiedbyusingB3LYP/TZVPandCCSD(T)/6-311+G(3dr,3pd)methods:theO/Sexchangereaction(VS~++CO→VO~++CS)andtheS-transferreaction(VS~++CO→V~++COS).Thetworeactionsproceedviatwo-stepandone-stepmechanism,respectively.ThebarriersofthetripletandsingletPESsare30.6and50.9kcal/mol,respectively,forO/Sexchangereactionand7.3and50.2kcal/mol,respectively,fortheS-transferreaction.Theresultsindicatethatthetripletgroundstatereactionismorefavorable,andtheS-transferreactionismorefavorablethantheO/Sexchangereaction,whichisingoodagreementwiththeexperimentalobservation.

简介：Inthispaperasimulatedannealing(SA)algorithmispresentedforthe0/1mul-tidimensionalknapsackproblem.Problem-specificknowledgeisincorporatedinthealgorithmdescriptionandevaluationofparametersinordertolookintotheperfor-manceoffinite-timeimplementationsofSA.ComputationalresultsshowthatSAper-formsmuchbetterthanageneticalgorithmintermsofsolutiontime,whilsthavingamodestlossofsolutionquality.

简介：ThispapershowsthattheC1-curvedfiniteelementdevelopedbyBernadoningeneralcannotsatisfytheessentialboundaryconditionsonapproximateboundary.Furthermore,amodifiedC1-curvedfiniteelementisgiven,whichiscompatiblewiththeelementofArgyristriangleandcansatisfythehomogeneousDirichletboundaryconditionsonapproximateboundary.

简介：TheCMSregionalcalorimetertriggersystemdetectssignaturesofelectrons/photons,taus,jets,andmissingandtotaltransverseenergyinadeadtinmesspipelinedarchitecture.Thissystemreceives7000calorimetertreggertowerenergieson1.2Gbanddigitalcoppercableseriallinksandprocessestheminalow-latencypipelineddesignusingcustom-builtelectronics.AttheheartofthesystemistheReceiverCardwhichusesthenewgenerationofgigabitethernetreceiverchipsonamezzaninecardtoconvertserialdatatoparalleldatabeforetransmissionona160MHzbackplaneforfurtherprocessingbycardsthatsumenergiesandidentifyelectronsandjets.Wedescribethealgorithmsandhardwareimplementation,andsummarizethesimulationresultsthatshowthatthissystemiscapableofhandlingtheraterequirementswhiletriggeringonphysicssignalswithhighefficiency.

简介：Fourteennew1-acyl-5-arylbiuretsweresynthesizedbythereactionofarylureaswithacylisocynantes.Thelatterwasobtainedfromacylchlorideandleadcyanateindichloromethane,usingpyridineascatalyst.Thestructuresofcompounds3a-nwereconfirmedbyIR,1HNMRandMSspectra.

简介：Itisoftenstatedthatevencleantokamakdischargesdisruptathighdensity.Onepossibilityisthatsuchdisruptionresultfromtheenergylossarisingfromhydrogenrecyclingattheedgeoftheplasma.thisenergylosscouldleadtoacontractionofthecurrentchannelandtheproductionofadisruptivelyunstableconfiguration.

简介：这份报纸基于图1拉普拉斯算符为Cheeger切割论述理论和算法的详细评论。在可行集合的房间结构的优点，我们建议一个房间下降(CD)为完成Cheeger的框架切了。当插松驰在可行集合保证客观价值的减少时，从哪个反的力量(IP)方法和最陡峭的降下(SD)方法能也被恢复，我们能得到二个指定CD方法。所有这些方法的比较在几张典型的图上被进行。[从作者抽象]

简介：Lower-hybridcurrentdrive(LHCD)experimentswerecarriedouttheHL-1Mhydrogenplasmas.TheeffectofLHCDoncentralMHDactivities[sawtooth(m=0),m=1mode]werestudiedwiththefluctuationsobservationofthesoftX-ray(SXR)emission.