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简介：Threenewditerpenoids,namedesquirolinB(1),C(2),D(3)respectively,andtwoknowncemocundseariocal(4)andtaraxerolwereisolatedfromColeusesquirolii(Levl).Thestructureelucidationwasachievedbyspectroscopicmeans

简介：etRb,c(n)denotethenumberofrepresentationsofnasthesumofonesquare,fourcubes,oneb-thpowerandonec-thpowerofnaturalnumbers.Itisshownthatifb=4,4≤c≤35,orb=5,5≤c≤13,orb=6,6≤e≤9,orb=c=7,thenRb,c(n)>>n^5/6+1/b+1/cforallsufficientlylargen.

简介：不同材质的材质汇集，艳俗色彩，以光影为依托，游离于时空之上，融洽气氛天衣无缝，看似安静的状态下，快乐天使一天也未曾怠慢！

简介：TheColliderDetectoratFermilab(CDF)experimentrecordsandanalysesproton-antiprotioninteractionsatacenter-of-massenergyof2TeV,RunIIoftheFermilabTevatronstartedinAprilofthisyear,Thedurationoftherunisexpectedtobeovertwoyears.OneofthemaindatahandlingstrategiesofCDFforRUnIIistohidealltapeaccessfromtheuserandtofacilitatesharingofdataandthusdiskspace,Adiskinventorymanagerwasdesignedanddevelopedoverthepastyearstokeeptrackofthedataondisk.tocoordinateuseraccesstothedata,andtostagedatabackfromtapetodiskasneeded.TheCDFRunIIdiskinventorymanagerconsistsofaserverprocess,auserandadministratorcommandlineinterfaces.andalibrarywiththeroutinesoftheclientAPI.Dataaremanagedinfilesetswhicharegroupsofoneormorefiles.Thesystemkeepstrackofuseracesstothefilesetsandattemptstokeepfrequentlyaccesseddataondisk.Datathatarenotondiskareautomaticallystagedbackfromtapeasneeded.ForCDFthemainstagingmethodisbasedonthemt-toolspackageastapesarewrittenaccordingtotheANSIstandard.

简介：LetP（z）beapolynomialofdegreenandforanycomplexnumbera,letDaP（z）=nP（z）＋（a-z）P′（z）denotethepolarderivativeofthepolynomialP（z）withrespecttoa.Inthispaper,weobtaininequalitiesforthepolarderivativeofapolynomialhavingallzerosinsideacircle.Ourresultsshallgeneralizeandsharpensomewell-knownresultsofTuran,Govil,Dewanetal.andothers.

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简介：Cobaltandnickelcomplexes(1a-1dand2a-2d,respectively)supportedby2-imidate-pyridineligandsweresynthesizedandusedfor1,3-butadienepolymerization.ThecomplexeswerecharacterizedbyIRandelementanalysis,andcomplex1awasfurthercharacterizedbysingle-crystalX-raydiffraction.Thesolidstatestructureofcomplex1adisplayedadistortedtetrahedralgeometry.Uponactivationwithethylaluminumsesquichloride(EASC),allthecomplexesshowedhighactivitiestoward1,3-butadienepolymerization.Thecobaltcomplexesproducedpolymerswithhighcis-1,4contentsandhighmolecularweights,whilethenickelcomplexesdisplayedlowcis-1,4selectivityandtheresultingpolymershadlowmolecularweights.Thecatalyticactivitiesofthecomplexeshighlydependedontheligandstructure.Withtheincrementofpolymerizationtemperature,thecis-1,4contentandthemolecularweightoftheresultingpolymerdecreased.

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简介：树指标随机过程已成为近年来发展起来的概率论的研究方向之一．强偏差定理一直是国际概率论界研究的中心课题之一．本文通过构造适当的非负鞅，将Doob鞅收敛定理应用于几乎处处收敛的研究，给出了一类非齐次树上m阶非齐次马氏链的一类强偏差定理．

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简介：Koszul的概念微分分级(DG为短)代数学被介绍在[8]。让A是KoszulDG代数学。如果A的Ext代数学是有限维的，即，小模块k是在DGA模块的导出的范畴的一个紧缩的目标，那么，它被显示出在[8]那A有许多好性质。然而，如果Ext代数学是无限维的，很少对A被知道。是出现在[15](也参见提议2.2)，如果H(A)是有限维的，k不是紧缩的。在这篇论文，H(A)什么时候用Foxby两重性是有限维的由，被证明Koszul两重性定理也成立。BGG通讯的一个DG版本从Koszul两重性定理被推出。

简介：Thecrystalstructureofthetitlecomplex{[Co(TCB)2/2-(IMI)2(H2O)2][Co(IMI)4(H2O)2]}(H2O)4(whereTCB=1,2,4,5-benzenetetracarboxylicanion;IMI=imidazole)hasbeendeterminedbyX-raydiffractionmethod.Crystaldatafor{[Co(TCB)2/2(IMI)2(H2O)2][Co(IMI)4(H2O)2]}-(H2O)4:triclinic,spacegroupP1,a=1.0647(2)nm,b=1.1165(1)nm,c=1.00361(1)nm,α=91.56(1)°,β=111.34(1)°,γ=115.642(10)°,V=0.9772(3)nm5,Z=1.Thepolymercobalt(II)complexhasanovelthree-dimensionnetworkstructure.Co(1)atomandCo(2)atombotharecoordinatedinanoctahedralarrangementandlocatedinthecenterofthecoordinationanionandthecenterofthecoordinationcation,respectively.MoreoverfourcarboxylgroupsofTCBaredividedintotwotypes,twopara-carboxylgroupsbridgeCo(1)atominmonodentatefashionandothertwopara-carboxylgroupsareinfree.

简介：在概率论的发展过程中,对强极限定理的研究一直占重要地位,强极限定理也一直是国际概率论界研究的中心课题之一.本文通过构造适当的非负鞅,将鞅收敛定理应用于几乎处处收敛的研究,给出了非齐次树上m重非齐次马氏链的一类强极限定理.

简介：Bystudyingmodularinvariancepropertiesofsomecharacteristicforms,wegetsomegen-eralizedanomalycancellationformulason（4r-1）-dimensionalmanifoldswithnoassumptionthatthe3rdde-Rhamcohomologyofmanifoldsvanishes.Theseanomalycancellationformulasgeneralizeourpreviousanomalycancellationformulason（4r-1）-dimensionalmanifolds.Wealsogeneralizeourpreviousanomalycancellationformulason（4r-1）-dimensionalmanifoldsandtheHauYurigiditytheoremtothe（a,b）case.

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简介：Inthispaper,weconsidertheclassofpolynomialsP(z)=anzn+∑nν=μan-νzn-ν,1≤μ≤n,havingallzerosin|z|≤k,k≤1andtherebypresentanalternativeproof,independentofLaguerre’stheorem,ofaninequalityconcerningthepolarderivativeofapolynomial.