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：Theaimofthispaperistogiveasimpleproofoftherestrictiontheoremforthemaximaloperatorsonthed-dimensionalEuclideanspaceRd,whosetheoremwasprovedbyCarro-Rodriguezin2012.Moreover,weshallgivesomeremarksoftherestrictiontheoremforthelinearandthemultilinearoperatorsbyCarro-RodriguezandRodriguez,too.

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简介：Commerciallyavailablelatticescontainvariouskindsofmorphologicalimperfectionswhichresultingreatdegradationinlattices’mechanicalproperties,therefore,toobtainimperfectioninsensitivelatticestructureisobviouslyapracticalresearchsubject.Hierarchicalstructurematerialswerefoundtobeaclassofpromisinganti-defectmaterials.Thispaperbuildshierarchicallatticebyaddingsoftadhesiontolattice’scelledgesandnumericalresultsshowthatitsimperfectionsensitivitytomissingbarsisminorcomparedwiththeclassiclattice.Softadhesionwithappropriatepropertiesreinforcecelledge’sbendingstiffnessandthusreducethebendingdeformationinlatticecausedbymissingbarsdefect,whichisconfirmedbystatisticalanalysisofnormalizednodedisplacementsofimperfectlatticesunderhydrostaticcompressionandshearloads.

简介：Open-loopflowcontrolmethodwasusedtoaffectthedevelopmentofaturbulentwakebehindaD-shapedbluffbody.Loudspeakerswereembeddedinsidethebluffbodytoproducetwozero-net-massfluxjetsthrough2mm-widespan-wiseslotslocatedalongtheupperandloweredgesontherearwall.Thedragforcesfordifferentactuationamplitudes(C_μtheratiobetweenthemomentumoftheactuatingjetsandthemomentdeficitcausedbythebluffbody)andfrequencies(Sr_A)wereexamined.Theeffectsofthephasedifferenceinthetwojets(0andπ)werealsostudied.ItwasfoundthatwhenC_μwas0.1%,adragreductionupto5%wasachievedwhenthevelocitiesofthetwojetsvariedinphaseatafrequencyofSt_A=0.16.Whenthevelocitiesofthetwojetsvariedrroutofphase,significantdragincreasewasobserved.

简介：研究算子本身的性质是研究算子不动点问题的一个重要方法.很多学者在二维的空间中,通过构造不同的压缩映射或者膨胀映射的条件,研究算子的不动点问题.在这篇文章中,我们将引入D-度量空间和D-Ⅲ型膨胀映射的概念,在D-度量空间（三维的空间）中研究D-Ⅲ型膨胀映射的不动点及公共不动点定理.

简介：TheexistenceandorbitalinstabilityofstandingwavesforthegeneralizedthreedimensionalnonlocalnonlinearSchr¨odingerequationsisstudied.Bydefiningsomesuitablefunctionalsandaconstrainedvariationalproblem,wefirstestablishtheexistenceofstandingwaves,whichrelysontheinnerstructureoftheequationsunderconsiderationtoovercomethedrawbackthatnonlocaltermsviolatethespace-scaleinvariance.Wethenshowtheorbitalinstabilityofstandingwaves.Theargumentsdependupontheconservationlawsofthemassandoftheenergy.

简介：Wakestructuresandvortexinducedvibration(VIV)ofaspring-supportedwide-D-sectioncylinderwereexperimentallyinvestigatedusinganX-wire,anovelphase-lockedparticleimagevelocimetry(PIV),andanaccelerationsensoratalowspeedwindtunnel.Comparedwiththefixedcase,the2P(twopair)vortexmodeasdefinedbyGovardhanandWilliamson(2000)ratherthanS(singlevortex)modeexistsinthewake.Thevelocitydeficitbehindthecylinderismuchlargerthanthatoffixedcase.Themeandragcoefficientincreasesfrom1.42forthefixedcaseto1.64forthevibratingcase.TheReynoldsstresspresentsevendistributionandsmallwithincreaseddistanceofX/D=-2toX/D=-10.Thepowerspectradensitybasedonacceleratorandhotwiredatapresentsahighlightidentical.Itshowsthatafterastronginteractionthecylindervibrationandthevortexsheddingcometoastablestate.Thevortexsheddingistotallylockedonandcontrolledbythecylindervibration.

简介：设{X_i,i≥1}是一列服从控制变化尾分布族（D族）的非负的、END的但不必是同分布的随机变量序列,{N_t,t≥0}是一列取非负正整数值的随机变量序列.在给定一些假设条件下,得到了随机和的S（t）=∑_（i=1）~（N（t））X_i（t≥0）的精确大偏差的结论,推广了独立情形下的相应结论.

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简介：Foraccuracyandrapidityofaudioeventdetectioninthemass-dataaudioprocessingtasks,agenericmethodofrapidlyrecognizingaudioeventbasedon2D-HaaracousticsuperfeaturevectorandAdaBoostisproposed.Firstly,itcombinescertainnumberofcontinuousaudioframestobean'acousticfeatureimage',secondly,usesAdaBoost.MHorfastRandomAdaBoostfeatureselectionalgorithmtoselecthighrepresentative2D-Haarpatterncombinationstoconstructsuperfeaturevectors;thirdly,analyzesthecommonalityanddifferencesbetweensubcategories,thenextractscommonfeaturesandreducesdifferentfeaturestoobtainagenericaudioeventtemplate,whichcansupporttheaccurateidentificationofmultiplesub-classesanddetectandlocatethespecificaudioeventfromtheaudiostreamaccurately.Experimentalresultsshowthattheuseof2D-Haaracousticfeaturesupervectorcanmakerecognitionaccuracy5%higherthanonesthatMFCC,PLP,LPCCandothertraditionalacousticfeaturesyielded,andcanmakethetrainingprocessing7-20timesfasterandtherecognitionprocessing5-10timesfaster,itcanevenachieveanaverageprecisionof93.38%,anaveragerecallof95.03%undertheoptimalparameterconfigurationfoundbygridmethod.Aboveall,itcanprovideanaccurateandfastmass-dataprocessingmethodforaudioeventdetection.

简介：Thepresentworkisconcernedwithapenny-shapedDugdalecrackembeddedinaninfinitespaceofone-dimensional(1D)hexagonalquasicrystalsandsubjectedtotwoidenticalaxisymmetrictemperatureloadingsontheupperandlowercracksurfaces.ApplyingDugdalehypothesistothermo-elasticresults,theextentoftheplasticzoneatthecracktipisdetermined.Thenormalstressoutsidetheplasticzoneandcracksurfacedisplacementarederivedintermsofspecialfunctions.Forauniformloadingcase,thecorrespondingresultsarepresentedbysimplifyingtheprecedingresults.Numericalcalculationsarecarriedouttoshowtheinfluenceofsomeparameters.

简介：针对同时包含可线性补偿和不可线性补偿两种属性且属性值为确实数、区间数、语言信息的风险型多属性决策问题，提出一种基于消错理论的决策方法。首先，在消错理论的基础上将属性分为关键型、重要型和冗余型三类，结合属性值的类型分别给出对应的错误函数和极限损失值；接着，对关键型属性赋予极小权重，在保留关键型属性“一票否决”功能的同时又突出重要属性的作用；最后，根据对待错误损失的不同态度，建立计算错误损失值的三种方法，通过计算期望错误损失值对备选方案进行排序。通过新市民信息服务项目的例子，说明该方法的有效性和可行性。

简介：基于斯特林制冷式4×288元光伏型碲镉汞二维探测器,根据红外扫描成像系统原理,设计了一个扫描型长波红外连续变焦光学系统。根据系统指标要求对光学指标进行分解计算及光学优化设计得到系统的光学参数和外形结构图,并对扫描光学系统的冷反射进行分析优化。该光学系统采用三次成像的结构,由变焦望远镜组、扫描摆镜、中继镜组、成像镜组4部分组成,包含9片透镜和2片反射镜。为了降低校正色差成本,系统使用了硫系玻璃镜片。光学仿真结果表明：系统在耐奎斯特频率处的全视场光学传递函数大于0.35,全视场畸变小于2%。最后,对系统进行了成像实验验证,结果表明：该系统可以实现30.8-154mm范围内连续变焦,变焦过程中目标景物清晰,细节分辨率高,无冷反射现象出现,该系统具有分辨率高、热灵敏度高、像质清晰等特点。

简介：Inthispaper,asurfacepotentialbasedthresholdvoltagemodeloffully-depleted(FD)recessed-source/drain(Re-S/D)silicon-on-insulator(SOI)metal-oxidesemiconductorfield-effecttransistor(MOSFET)ispresentedwhileconsideringtheeffectsofhigh-kgate-dielectricmaterialinducedfringing-field.Thetwo-dimensional(2D)Poisson’sequationissolvedinachannelregioninordertoobtainthesurfacepotentialundertheassumptionoftheparabolicpotentialprofileinthetransversedirectionofthechannelwithappropriateboundaryconditions.Theaccuracyofthemodelisverifiedbycomparingthemodel’sresultswiththe2DsimulationresultsfromATLASoverawiderangeofchannellengthsandotherparameters,includingthedielectricconstantofgate-dielectricmaterial.

简介：通过权函数方法和算子理论,定义了一个Hilbert型积分算子,并给出了它的范数.作为应用,建立了一个Hilbert型积分算子不等式和它的等价形式,并考虑了一些特殊结果.

简介：为解决常规药型罩破片群成型中存在的径向发散不足的问题，对传统的成型弹体结构进行了改进，并对药型罩破片群的成型过程进行了数值仿真，最后通过靶板效应实验进行了验证。研究结果表明，药型罩破片群的径向发散能力得到了有效增强，形成的破片群径向散布角达到18°。

简介：物理实验作为物理教学的重要内容,对学生能力的培养具有非常重要的作用。针对华北电力大学物理实验教学的具体情况,提出了以下改革措施。开创了分层次教学的＂四阶段＂教学模式,相应地开设四门课程;完善物理演示实验室和开设物理演示实验课。

简介：本文引入契贝晓夫多项式作为基函数,利用Galerkin方法研究了一类Fredholm-Volterra积分方程的数值解,并进行了数值模拟.结果表明,该方法可行且有效.