简介：Anisodinewassynthesizedfrom3α-hydroxy-6β-acetyltropinein11steps.Laevorotaryisomerofanisodinewaspreparedfromtheasymmetricdihydroxylationofcompound10viatheosmiumcatalyzedprocessemployingp-chlorobenzoyldihydroquinidineasthechiralligands.

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简介：Thisarticlesummarizestheachievementsoftheauthors'groupintheareaofbiocatalyst-catalyzedorganicreactionsinrecent10years.AstrainofGeotrichumsp.obtainedbyscreeninuiscapableofstereoselectlvelyreducinganumberofcarbonylcompounds.Inmanycases,thestermghemistryiscomplementarywiththatobtainedbybaker'syeast.Therefore,thismicroorganismprovidesausefulpathwaytothepreparationofalcoholeompoundswithspecificconfigurations.Ontheotherhand,anmmberofplantsoureeshavebeenscreenedforoxynitrilasesandthehydrocyanationreactionsofvariousarylcarboxalde-hydeshavebeeninvestigated.A'micro-aqueousreactionsystem'wasinvented,bywhichaserlesofnovelopticallyactivecyanohydrinswereprepared.Onthishasis,ahighthrough-putcomtimasousreactionsystemhasbeendesigned.Thispaperalsodeseribesexamplesofthesynthesesofbio-activecompoundsbyusingtheoptieallyactivecompoundsobtainedfromtheabovementionedcatalyticreactionsasprecursors.

简介：Thebuyer-supplierrelationshipplaysagreatroleinmosteconomicsystems.Thebuyingfirmusuallytriestofindanewsupplierwhoprovidesproductswithsatisfyingqualityandlowerprice.Abroadbranchofliteraturedealswiththedevelopmentofbuyer-supplierrelationships,butlimitedresearchisonthecircumstancesunderwhichabuyershouldterminatesucharelationshipandswitchtoanewsupplier.Inthispaper,theincentivecompatibilityconstraint(IC)whichinducestheentrantsuppliertoreporthistruecostisconsidered,andtheparticipationconstraint(PC)whichensurestheentrantsuppliertogetatleastreservationprofitistakenintoaccount.Thenthesupplierswitchingmodelissetuptominimizethebuyingfirm’stotalprocurementcostwhichincludesthetransferpaymenttotheincumbentsupplier,thepaymenttotheentrantsupplierandtheswitchingcost,andthebuyingfirm’sswitchingcostisconsideredasafunctionoftheswitchingquantity.WiththetheoreticalanalysisofIC,PCandtheproposedmodel,theoptimalsupplierswitchingstrategycanbeobtained.Finally,anumericalexampleisgiventoillustratetheeffectivenessoftheproposedmodelandtheswitchingstrategy.

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简介：Anewmethodforanalyzingdynamicsofcontinuousneuralnetworksisproposed,andthenecessaryconvergenceconditionsforaclassofassociativenetworksareobtained.Basedonthestabilitycriterionandtheequationsofequilibriumsetofthenetwork,synthesisofaclassofassociativeneuralnetworksisgiven.Thestabilitycontrolmodelofasymmetricunstablenetworksissuggested,whichisalsoavalidwayforoptimizationanddynamiccontrolofstableneuralnetworks.

简介：抗抑郁剂duloxetine(1)经由3-(dimethylamino)的不对称的转移加氢被准备-1-(thiophen-2-yl)propan-1-one(3)。Ru(II)，坚牢酸性蓝RH(III)和红外(III)几chiralligands的建筑群作为催化剂被检验并且(S，S)-N-tosyl-1,2-diphenyl乙烯肼(TsDPEN)Ru(II)建筑群被发现提供好产量和优秀enantioselectivity。

简介：Inviewoftherecognitionoftheimportanceoftheinterdependentbehaviorofstrengthandstiffnessofwalltypestructuralelements,theseismicdemandofplan-asymmetricsystemsisrevisited.Usefulstrengthdistributionstrategies,i.e.,'CenterofStrength-CenterofMass(CV-CM)coinciding'and'BalancedCenterofStrength-CenterofResistance(CVCR)'areadopted.Designchartsfortheseismicdemandofclassicaluni-directionallyandbi-directionallyasymmetricsystemsaredevelopedinasimpleunifiedformat.Aconceptualframeworkisalsooutlinedtoconvenientlyapplythedesigncharts.Illustrationsareincludedtoexplaintheuseofthecurrentrecommendationsinpracticaldesign.Thestudyalsohighlightstherelativeperformanceof'CV-CMcoinciding'and'BalancedCV-CR'criteria.

简介：ThesupportedRh-DIOPcomplexeswerepreparedthroughfunctionalizationofseveralmacroporouspolystyreneresinsndwereevaluatedbythehydrogenationofacetamidocinnamicacidinEtOH.Theporeeffectofthematrixeswasdiscussed.

简介：TheanalysisoftheSPECTRUM(SpecialExperimentConcerningTyphoonRecurvatureandUnusualMovement)dataindicatesthatthestructureofrecurvingtargettyphoons9015(Abe),9019(Flo)and9020(Gene)atdifferentstagesofmovingprocessesshoweddifferentmotionfeatures.Ondifferenttimescales,temporalvariationsoftyphoonstructureandmotionspeeddisplayeddifferentfeatures.

简介：波浪光线理论被采用与不对称的基本流动在台风学习旋涡Rossby波浪的繁殖小径(光线)的特征，在正切的不对称的基本流动被在对称的基本流动上附加wavenumber-1不安流动构造的地方，并且光线的基本流动从非分叉方程被导出。在某个远处，在组速度和旋涡Rossby波浪的光线的斜坡上的基本流动的不对称现象的影响主要是的结果表演在最大的风(RMW)的半径附近专注，而它在RMW外面减少。在不对称的基本流动的旋涡Rossby波浪的光线、正切的组速度的分布是仔细，与这个组上的光线、正切的基本流动的不对称的基本流动，和重要性的最大的速度的方位角地点有关，速度将随着半径变化。另外，在基本流动的更强壮的不对称现象总是对应于旋涡Rossby波浪的更快的外面的精力繁殖。简言之，组速度，并且从而，波浪精力繁殖和旋涡Rossby波浪光线在台风倾斜，将被基本流动的不对称现象改变。

简介：NiOOHnanosheet/graphenehydrogels(HNiOOH/GS),withmesoporousNiOOHnanosheetsuniformlydispersedwithinthehighlyin-terconnected3Dgraphenenetwork,areconstruct-edandstudiedforthefirsttimebyamixedsolvo-thermalandhydrothermalreaction.Theeffectofsol-ventcompositiononthemorphology,phase,anddispersibilityofnanocrystalandhydrogelstrengthis

简介：1IntroductionPollingsystemstriggeredextensiveresearcheffortsthatcontinuedoverthelasttwodecades.Duringthisperiodnumerousresearchersfromallareas,mainlyengineering,findthatpollingsystemsarepowerfultoolsinmodelingawidevarietyofapplications.Therangeofapplicationsinwhichpollingmodelcanbeusedisverybroad.Ontheba-sisofthecyclicpolling,inthispaperanewmodel,theasymmetriccyclicpollingmodelwithlimited(k=1)serviceindiscretetimeinloopLANofATMnetworks,issetup,andithasthefollowingcharacteristics:

简介：在这篇论文，在采购的优秀评估水平决定问题的问题在不同信息背景下面被学习。基于斯坦利的优秀收缩优化模型；其它，担心质量的一个主要代理人模型预防水平；评估水平作为主要关于买主被建立；供应商是代理人。在模型，优秀预防水平是供应商决定的一个变量，优秀评估水平；转移支付是买主决定的变量。我们集中于优秀评估水平的学习；在在不对称的信息下面采购转移支付决定。当供应商质量预防水平信息被隐藏时，最大的原则被用来得到答案到优秀评估水平。最后，模拟计算被执行与拖拉机生产采购使一个农业机器公司的生意担心了。在不同信息背景下面的模拟结果被分析；比较。

简介：试验性的调查被执行在在平静的水里进展的一个pentamaran模型的全部的抵抗上估计干扰性能的关系。为这动机，总数轮船拖为不对称的悬臂梁配置和壳分离的几价值被执行，在范围0.3-0.9改变弗鲁德数字。当波浪干扰可以发生时，我们的结果显示在抵抗的显著变化在横向的距离价值(壳分离)要求著名变化。另外，没有单个配置，一致地越过全部速度范围和最佳干扰因素超过另外的配置0.2与悬臂梁在S/L=0.33出现在0.45的一个弗鲁德数字外部位置：不对称为A3配置舷外。

简介：Asymmetrichydrisilylationcatalyzedbypolymericthiazolidinerhodiumcatalystswasconducted.Almostthesameopticalyieldshavebeenobtainedwhencomb-shapedpolymericligandsandtheircorrespondingmonomercomplexedrhodiumcataltystswereusedtoasymmetrichydrosilylationofacetophenone.Opticalyieldofchiral1-methylbenzylalcoholreachesashighas71.5%.Temperaturedependenceofenantioselectivehydrosilylationofacetophenonewasdiscussed.

简介：Stochasticresonance(SR)phenomenonofthesystemthatissubjecttotheasymmetrictwo-statenoiseisinvestigatedfromthebroadsense.Itisshownthattheamplitudesoftheoutputsignalexhibitthenon-monotonicdependenceontheinputsignalfrequencyω,andtheparametersdescribingtheasymmetrictwo-statenoise,suchasthetransitionrateλ,theorderparameterkdescribingtheasymmetricdegreeofthetwo-statenoise,andthenoisestrengthD.

简介：Thephenomenonofstochasticresonance(SR)inabistablenonlinearsystemisstudiedwhenthesystemisdrivenbytheasymmetricpotentialandadditiveGaussiancolorednoise.Usingtheunifiedcolorednoiseapproximationmethod,theadditiveGaussiancolorednoisecanbesimplifiedtoadditiveGaussianwhitenoise.Thesignal-to-noiseratio(SNR)iscalculatedaccordingtothegeneralizedtwo-statetheory(shownin[H.S.WioandS.Bouzat,BrazilianJ.Phys.29(1999)136]).WefindthattheSNRincreaseswiththeproximityofatozero.Inaddition,thecorrelationtimeτbetweentheadditiveGaussiancolorednoiseisalsoaningredienttoimproveSR.TheshorterthecorrelationtimeτbetweentheGaussianadditivecolorednoiseis,thehigherofthepeakvalueofSNR.