简介：ThesimultaneousdiagonalizationbycongruenceofpairsofHermitianquatemionmatricesisdiscussed.Theproblemisreducedtoaparalleloneoncomplexmatricesbyusingthecomplexadjointmatrixrelatedtoeachquatemionmatrix.Itisprovedthatanytwosemi-positivedefiniteHermitianquatemionmatricescanbesimultaneouslydiagonalizedbycongruence.

简介：差距统计数值是聚类有效性的一个著名索引，但是它的实现是困难的被理解并且精确地决定了。一个直接方法被介绍改进差距统计数值的表演，它使用在内簇分散的二顺序的差别在差距统计数值代替构造空参考分发。因此，差距统计数值的实现变得容易并且在应用是reformulated，和它的不确定性被减少。另外，差距统计数值的限制被二个典型例子分析，也就是说，差距统计数值是困难的被用于包含强壮重叠或不平密度的簇的数据集。实验验证建议方法的实用性。

简介：ＭＣＣＤＭＡ如同ＤＳＣＤＭＡ一样，也存在多用户干扰．ＭＬ准则是最佳的多用户检测准则，但其计算复杂度随用户数目增多而呈指数增长．神经网络利用其大规模并行的特点，可应用于此问题．本文论述了均场退火和混沌神经网络在此问题中的解决方案，并作了比较．

简介：Atwo-stagedelectronicballastwithwidedimmingrange,highpowerfactor(PF)andlowelectromagneticinterference(EMI)ispresented.Itchangestheinputvoltageofthestageofpowerinverterfordimmingcontrol,soitovercomessomelimitationsoftraditionalelectronicballaststhatusefrequencyvariation.Atthesametime,thestageofpowerinverterrunsunderthesoft-switchingatthefixedswitchingfrequencyandreducesEMIgreatly.Itsprincipleandcharacteristicareanalyzedindetail,andexperimentalandsimulatedresultsareobtainedona40Wfluorescentlamp.

简介：Inthispaper,theauthorspointoutanddemonstratethedifferenceoftheconceptsconcerningco-satisfiableandco-validbetweenonefirst-orderlanguageandtwofirst-orderlanguages,andputforwardtheconceptsaboutuniformco-identicaltruthanduniformco-satisfiability.Thussometheoremsinthebook“ACourseinMathematicalLogic”,writtenbyJ.L.BellandM.Machover,arecorrected.

简介：作为在bioethanol生产的设备的一关键片，煮坦克通常被用来保证液化的一致性。在这份报纸，我们建议煮坦克保证在一个大规模过程作为伪塞子流动知道的淀粉泥浆流动的一种类型的一种新奇类型。在流动地的分析，我们使用了计算液体动力学(CFD)。模仿液体固体二阶段的流动，我们基于粒子动力学选择了一个Euler-Euler模型。我们在流动地上调查了几个关键结构的参数的效果。结果与12,800为一辆坦克显示出那?在高度的公里并且1000?在从0潰楳楴湯?瑳畲瑣牵?湡??晲捡?潭灲潨潬祧戠?的直径，优化入口试管角度和入口试管直径范围的公里?慲?楤晦慲瑣潩?攠敮杲?楤灳牥楳敶堠爭祡猠数瑣潲敭牴??卄?堠爭祡瀠潨潴汥'虪箿e数瑣潲捳灯?猠慣湮湩?汥'虪箿珱＾驿麙盏?匨??琠慲獮業獳潩?汥'虪箿珱＾驿麙盏??卄攠敬敭瑮污洠灡楰杮吗？？

简介：AhomogeneoustheoreticalmodelisdevelopedtopredicttheperformanceofR22andR290inadiabaticcapillarytubes.Themodelisbasedonconservationequationsofmass,momentumandenergy.Metastablebothliquidandtwo-phaseflowregionsareconsideredinthemodel.Inmetastabletwo-phaseregion,superheatedliquidisintroducedintothemetastablemixtureviscosityandtwomethodsarepresentedtoevaluateit.Themodelisvalidatedbycomparingthepredictedpressureandtemperatureprofileandmassflowratewithseveralinvestigators′experimentaldataofR22andoneofitsalternativesR290reportedinliterature.Allofthepredictedmassflowratesarewithin±8%ofmeasuredvalues.Comparisonsarealsomadebetweenthepresentmodelandotherinvestigators′modelsorsizingcorrelation.Themodelcanbeusedfordesignorsimulationcalculationofadiabaticcapillarytubes.

简介：CharacteristicsofR22anditsnewalternativerefrigerantR290flowingthroughadiabaticcapillarytubesareinvestigatedbasedonthehomogeneousmodel.Extensiveflowvariablesalongtubelengthsuchaspressure,temperature,viscosity,velocity,Reynoldsnumber,frictionfactorandvaporqualityetcarecomparedbetweenthetwofluidsunderthesameoperatingcondition.Twocasesareconsidered,namely,eitherthesametubelengthorthesamemassflowrateasinletcondition.TheresultsshowthatthemassflowrateinthecapillarytubeofR290is40%lowerthanthatofR22duetothedifferencesofphysicalpropertiesbetweenthetwofluids.Further,aparametricanalysisisperformedanditappearsthateffectsofgeometricandthermodynamicparametersonmassflowrateofR290areweakerthanthatofR22.Whenthecondensingtemperatureisincreasedfrom40℃to50℃,themassflowrateforR22isincreasedby16%,whiletheincreasingrateforR290is13%.