简介：让G是一个有限的组。让Irr1(G)是G和cd1(G)的非线性的无法缩减的人物的集合在Irr1(G)的人物的度的集合。组G被说如果，是D2-group|cd1(G)|=|Irr1(G)|2。这份报纸的主要目的是分类nonsolvableD2-groups。

简介：CO2methanationhasbeenahottopicbecauseofitsimportantapplicationinthespacecraftandpotentialutilizationofcarbondioxide.Nickelcatalystisactiveforthisreaction.However,itsactivitystillneedstobeimproved.Dielectricbarrierdischarge(DBD)plasma,initiatedatambientconditionandoperatedat~150°C,hasbeenemployedinthisworkfordecompositionofnickelprecursortoprepareNi/MgAl2O4.Theplasmadecompositionresultsinhighdispersion,uniquestructure,enhancedreducibilityofNiparticlesandpromotedcatalyst-supportinteraction.AnimprovedactivityofCO2methanationwithahigheryieldofmethanehasbeenachievedovertheplasmadecomposedcatalyst,comparedtothecatalystpreparedthermally.Forexample,themethaneyieldoftheplasmapreparedcatalystis71.8%at300°Cbutitis62.9%overthethermalpreparedcatalyst.ThecatalystcharacterizationconfirmedthatCO2methanationovertheDBDplasmapreparedcatalystfollowspathwayofCOmethanation.

简介：IntheinterlayerexpansionofthelayeredzeoliteprecursorCOK-5,aSn,salt,bis(2,4-pentanedionate)-dichlorotin[Sn(acac)2Cl2],insteadofasilylatingagentwasusedtolinkthelayersat180°C.Theobtainedmaterial,whichisdesignedasSn-COE-5,showsashiftofthefirstXRDreflection,whichisverysimilartothatofCOK-5interlayerexpandedwithdichlorodimethylsilane(DCDMS),indicatinganincreaseininterlayerdistance.X-raydiffraction(XRD),N2sorptionisotherms,inductivelycoupledplasma(ICP),andX-rayphotoelectronspectroscopy(XPS)supporttheincorporationofisolatedSnsitesinthesample.Intheconversionofglucosetolevulinicacid,Sn-COE-5exhibitsmuchhigheractivitythanCOK-5,whichisduetothepresenceofLewisacidicsitesintheSn-COE-5.

简介：TheinfluenceofNa2SO4ontheformationofZnOwhiskerswasinvestigatedinthispaper.ZnOwhiskerswithaspectratiosofupto50weresynthesizedbydissolvingε-Zn（OH）2precursorinNaOH/Na2SO4solutionatroomtemperature,followedbyagingoftheresultingsolutionat140℃for6h.Fouriertransforminfraredspectroscopy,Ramanspectroscopy,andX-rayphotoelectronspectroscopyanalysesrevealedthatSO42-ionswereprimarilyadsorbedonthe（100）planeoftheZnOwhiskersviaanouter-spherecomplexconfiguration（O-H…O）,therebypromotingtheone-dimensionalgrowthofZnOwhiskersalongthec-axis.

简介：Lifetimemeasurementsoflow-lyingexcitedstatesin87Zrand87Nbhavebeenperformedviaandcoincidences.The124MeV32SbeamwasdeliveredfromtheSector-FocusingCyclotron(SFC)oftheHeavyIonR-esearchFacilityinLanzhou(HIRFL).Theparentnuclei87Nband87Mowereproducedbytherespectivereactions58Ni(32S,3p)and58Ni(32S,2p1n),atabeamenergy100MeVthroughthe8mAldegrader.

简介：《大学物理学》与高中阶段物理学教材的一个显著区别在于高等数学这一工具的引入,正是基于这一重要的数学工具,学生对有关物理概念的理解以及对具体物理问题的解决都提高到了一个全新的高度。但将本身就具有一定的抽象性和复杂性的数学工具直接用来处理物理问题,大部分学生会感觉难以把握。通过总结教学工作中发现的问题以及积累的经验,分析了如何通过建立一种化抽象为形象的有效机制,将高等数学工具与物理知识恰当结合,从而达到提高教学质量的目标。

简介：本文主要研究调和Bergman空间L_h~2（D）上以拟齐次函数为符号的两个小Hankel算子的有限秩换位问题.

简介：针对近圆轨道编队卫星,提出了一种仅需要地平仪两轴姿态测量的卫星自主相对导航滤波方法,利用星间相对测量与偏航姿态运动的弱相关性,解决了欠偏航量测下的相对位置估计以及三轴姿态确定问题。可观性分析证明了该方法的可行性及对编队构型参数的适应性。大量仿真表明,对于绕飞和伴飞构型,该方法均收敛,性能特性与理论分析一致。针对当前典型的地平仪与星间测量能力,相对位置滤波精度均优于2m（3σ）,绕飞构型偏航姿态精度优于1.0°（3σ）,伴飞构型偏航姿态精度优于0.5°（3σ）,是对中等精度编队卫星配置简化的有益探索。

简介：本文通过磁耦合共振的无线输电技术实现了对旋转LED主板的供电，并研制出一套旋转式LED点阵显示演示仪；通过STC12C5A32S2单片机实现对LED的控制和显示；通过红外通信实现对显示字符的红外操作；通过电机驱动实现LED的旋转显示。通过对旋转主板和底座主板的设计，实现了LED旋转显示的功能。该演示仪在实验和教学中起到了良好的演示效果。

简介：Theshapeofnanostructurehasimportanteffectsontheirproperties,thereforeinthisstudy,wehavepreparedandcharacterizedthreedifferentmorphologiesofWO3nanostructuresi.e.nanorod,nanosphereandnanoplateforsurveyingshapeeffectontheirphotocatalyticpropertiestowarddegradationofRhodamineB(RhB)dye.ObtainedresultsshowthatnanoplateWO3incomparisonwithothershasthebestphotocatalyticactivity.AccordingtoSEM,andphotocatalyticdegradationresults,thereasonforthisbehavioristhesharpedgesandcornersofWO3nanoplates.Becauseoftheirlowcoordinationnumber,atomslocatedintheedgesandcornersoftheWO3nanoplateshavemoreactivity,adsorbmoreRhBandthereforegivemorephotocatalyticactivitytotheWO3nanoplates.UsingofdifferentscavengersshowedthathydroxylradicalsaremainlyresponsibleforphotocatalyticactivityofWO3nanoplatesandnanospheresbutforWO3nanorods,superoxideradicalsarethemainphotocatalyticdegradationagents.

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简介：Amolybdenumdisulfide（MoS2）saturableabsorberwasfabricatedbythermallydecomposingtheammoniumthiomolybdate.ByusingtheMoS2absorber,acompactdiode-pumpedpassivelyQ-switchedTm:GdVO4laserhasbeendemonstrated.AstableQ-switchedlaserwithrepetitionratesfrom25.58to48.09kHzwasachieved.Maximumaverageoutputpowerwas100mWwiththeshortestpulsedurationof0.8μs.Maximumpulseenergyis2.08μJatcenterof1902nm.

简介：Theroleofpulseparametersonnanoparticlepropertyisinvestigatedself-consistentlybasedonacoupleoffluidmodelandaerosoldynamicsmodelinacapacitivelycoupledparallel-plateacetylene(C2H2)discharge.Inthismodel,themasscontinuityequation,momentumbalanceequation,andenergybalanceequationforneutralgasaretakenintoaccount.Thus,thethermophoreticforceariseswhenagastemperaturegradientexists.Thetypicalresultsofthismodelarepositiveandnegativeiondensities,electronimpactcollisionsrates,nanoparticledensity,andchargedistributions.Thesimulationisperformedfordutyratio0.4/0.7/1.0,aswellaspulsemodulationfrequencyfrom40kHzto2.7MHzforpureC2H2dischargesatapressureof500mTorr.Wefindthatthepulseparameters,especiallythedutyratio,haveagreataffectonthedissociativeattachmentcoefficientandthenegativedensity.Moreimportantly,bydecreasingthedutyratio,nanoparticlesstarttodiffusetothewall.Undertheactionofgasflow,nanoparticledensitypeakiscreatedinfrontofthepulseelectrode,wherethegastemperatureissmaller.

简介：以新疆大学为例，探究民族地区本科院校提高数学教育教学质量的途径及意义，同时，针对存在的一些问题，看清困难，力求在数学教学中突出特色，注重实际，不断提高教育水平，走出一条有特色的教育之路是少数民族地区本科院校大学数学教育教学改革的当务之急．

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