简介：电感是电子技术中广泛应用的电子元件。在高频电子线路中,导线电感对电器工作稳定性影响较大。因此了解电感的测量对工科学生来说具有较大的意义。基于交流电桥的原理,研究了输入信号与电桥输出测量端信号的相位差,建立了导线电感与相位差的关系。实验测了线径为0.2mm,长度为0.3m和0.5m圆形导线对输出端波形相位的延时。通过延时值计算了相应的相位差,最后得到0.3m长圆形导线的电感量约为3.99nH,0.5m长度圆形导线的电感量约为8.27nH。

简介：对散布阶段的0部分波浪πK转移的J=的背景贡献的不确定性小心地被学习。我们第一指出圆形的切割在S1/2和S3/2波浪展出不同人物。当前者否定地作出贡献到散布长度参数时，后者断然作出贡献，即，有一个错误的符号。这个事实显示对阶段移动的短范围力量贡献在异国情调的隧道是非可以忽略的。不过，κ杆将在估计左手切了贡献关于理论不确定性仅仅稍微被影响，这被验证。

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.

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简介：《K文件》这本有占奇怪的左图右文的书，是一群有点奇怪的K客玩出来的，K客是一群艺术玩家，他们几乎无所不玩，无所不玩而后快，他们提出的口号是：一、用自己的玩法去玩。二、人人都是艺术家。然后，他们使用PS、鼠标笔、某种奇怪的文字，各种随手物件和一个开窍的大脑，开始去K。

简介：Inthisstudy,weattempttheanalysisofthepassageflowinthecentrifugalimpellerusingFEMwith/withouttheturbulencemodel,andcomparethisresultwiththeexperimentalresult.TheturbulencemodelisthelowReynoldsk-εmodelproposedbyChien.WeusetheGSMACmethodfortheReynoldsaveragedNavier-Stokesequations,theEulerexplicitmethodforthetransportequationsoftheturbulentkineticenergyandthedissipationrate.AllequationsarediscretizedbytheGalerkin'smethod.Atthemidpassageofthecentrifugalimpeller,thepassagewisevelocitycomponenttendstoincreaseinthepressure-to-suctiondirection,andtheothercomponenttowardthepressuresurfacetendstobelargeintheregionofthemiddleblade-to-bladetothehubside.Thetipleakagesappeararoundtheregionofthemiddleblade-to-bladenearthecasingtogetherwiththesecondaryflowtowardthesuctionsurface.Thesephenomenacorrespondwiththeexperimentalresult,qualitatively.

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简介：In2010,theBESCollaboration[1]foundaclearenhancementintheK0K0massdistributionintheJ=ψ!ηK0K0decay.SuchanenhancementisusuallyasignatureofanL=0resonancearoundthreshold,whichinthiscasewouldcorrespondstoanh1statewithquantumnumbersIG(JPC)=0??(1+??).Thish1statewaspredictedbytheChiralUnitarytheoryintheKKinteraction.Becauseoftheconversationlaw,thisstatecanonlydecaytoK0K0channel,andcanbestudiedefficientlyintheJ=ψ!ηK0K0decay.

简介：WehavedepositedW/Simultilayermirrorsusingthemagnetronsputteringunderthelowsputteringpressureandthehighmagneticfieldstrength,andmeasuredtheirreflectivtityinBeijingsynchrotronradiationfaciltiy,W/Simultilayershowthepeakreflectivityofapproximately10%ataphotonenergyof1200eVand10.5%ataphotoenergyof700eVrespectivelyattheincidenceangleof81°。

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简介：TheextendedcanonicalNoetheridentitiesandcanonicalfirstNoethertheoremderivedfromanextendedactioninphasespaceforasystemwithasingularLagrangianareformulated.UsingthesecanonicalNoetheridentities,itcanbeshownthattheconstraintmultipliersconnectedwiththefirst-classconstraintsmaynotbeindependent,soaquerytoaconjectureofDiracispresented.BasedonthesymmetrypropertiesoftheconstrainedHamiltoniansysteminphasespace,acounterexampletoaconjectureofDiracisgiventoshowthatDirac'sconjecturefailsinsuchasystem.WepresenthereadifferentwayratherthanCawley'sexamplesandother'sonesinthatthereisnolinearizationofconstraintsintheproblem.Thisexamplehasafeaturethatneithertheprimaryfirst-classconstraintsnorsecondaryfirst-classconstraintsaregeneratorsofthegaugetransformation.

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简介：研究目的：研究新型磁性回热填料Gd2O2S对液氦温区高频脉管制冷机多级回热器损失特性的影响。创新要点：确定了不同回热填料以及运行参数（频率、平均压力）下液氦温区多级脉管制冷机的制冷温度和各级预冷量，进一步明确了4K高频回热损失机理。研究方法：采用理论研究与实验验证相结合的方法，基于一台两级G-M型低频脉管制冷机预冷的单极斯特林型高频脉管制冷机，研究多级回热器在高频以及4K温区下的损失特性。选取新型回热填料Gd2O2S替代部分回热填料HoCu2，比较回热器采用两种填料时在不吲运行频率及平均压力下的冷端制冷温度（图10）、各级预冷量和预冷温度（图1112）。重要结论：采用孔隙率较小的新型磁性回热填料Gd2O2S可显著改善第一级回热器内压力波与质量流的相位关系，从而减小该级回热损失。减小平均压力可以降低制冷机无负荷制冷温度并减小第二级预冷量，但制冷工质氦的体积比热容会急剧增大，从而使低温级回热器的换热对频率非常敏感。此外，频率对高温级回热器的回热特性影响不明显。该方法可以为三级斯特林型4K多级脉管制冷机提供设计依据。

简介：Mixedalcoholisofgreatpromiseasoctaneimproverinautomotivefuel,andhopefultoreplacetheMTBEtoreducetheenvironmentalpollution,Inthisfield,alkali-promtedmolybdenum-basedcatalystshavebeengivenspecialinterestbecauseoftheirexcellentsulfur-toleranceforsynthesisofmixedalcoholfromCO+H2,Itwasreportedthatthecoblatisafavorablepromoterforenhancingalcoholproduction,especiallyforimprovingtheselectivityforC2+alcohol[1-3],moreover,stronginteractionbetweenConandMoisinfavorofmixedalcoholsynthesis[4].Recently,weprparedakindofK-Co-Moultrafineparticlesbysol-gelmethodanditshowsmuchsmallerparticlesizebuthigheractivtyandselectivitytowardalcoholformationthantheonepreparedbyconventionalmethod[5],TheaimofthepresentworkistoresearchthemicostructuresoftheMoandCospeciesintheK-Co-Mosamplespreparedbydifferentmethod.

简介：我们在超流体3He-B经历Zitterbewegung，，自由相对论的迪拉克的电子。期望价值quasiparticle放，以及旋转被获得并且与迪拉克的电子的相比。特别地，Bogoliubov的quasiparticle的Zitterbewegung有约105比一个电子的降低的频率，显示更有希望的试验性的观察。

简介：平面连接的一种新、一般类型被介绍，它扩大由连接的二循环单人赛的运动学的链组成的Kempe开发的古典连接，由外卷的绞链相连。和一台锁住的设备，这些新连接有仅仅自由(DOF)的一度，它为用作使他们理想为不同目的部署有能力的结构。这里，我们为双环以分析的一个新鲜矩阵方法开始平面连接，用2D转变矩阵；一个新符号的符号。为Kempe的连接的一个盒子的另外的检查被提供。基于检查，借助于某小说代数学；几何技术，一个特别地迷人的答案被发现。物理模型被造证明在这篇论文的推导是有效的；新机制是正确的。

简介：当减肥遇见聚会．模特遭遇PARTY．美女与饕餮相逢……美丽的身材与美味之间将如何选择，心里盘算着永无止境的加减乘除．还是有第二条出路，如果丢掉肚脯上的赘肉．便意味着牺牲生命中的乐趣吗？你将永远拒绝朋友的聚会．或者在宴会上永远用眼睛享用美食？

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简介：Thereisagrowingsupportforthelowlyingscalarmesonsf0(500),f0(980),a0(980),and(800)tobegenerateddynamicallyfromtheinteractionofpseudoscalarmesons,whilethecaseofthenextsetofscalarresonancesathigherenergies,f0(1370),f0(1710),K0(1430)ismoreaquestionofdebate.Soisthecaseofthetensorresonancesf2(1270),f′2(1525),K2(1430).AnewperspectiveonthesestateshasbeenofferedinRef.[1]wherethef0(1370)andf2(1270)resonancesareshowntobegeneratedfromtheinteractionprovidedbythelocalhiddengaugeLagrangiansimplementingunitarization.Itisshownthattheideaofthenatureofthesestatesasvectormeson-vectormesoncompositestateshasbeentestedinmanyreactions.Yet,thepermanentdiscussionoftheissuedemandsextrachecksforotherobservablesand,inthissense,theweakdecaysbringanewsourceofvaluableinformationthatshouldservetotestdifferentmodels.

简介：Ingasturbineengines,laminar-turbulenttransitionoccurs.However,generally,theturbulencemodelstodescribesuchtransitionresultsintooearlyandtooshorttransition.Combiningaturbulencemodelwithadescriptionofintermittency,i.e.thefractionoftimetheflowisturbulentduringthetransitionphase,canimproveit.Bylettinggrowtheintermittencyfromzerotounity,startandevolutionoftransitioncanbeimposed.Inthispaper,amethodwhereadynamicequationofintermittencycombiningwithatwo-equationk-ωturbulencemodelisdescribed.Thisintermittencyfactorisapremultiplicatoroftheturbulentviscositycomputedbytheturbulencemodel.FollowingasuggestionbyMenteretal.[1],thestartoftransitioniscomputedbasedonlocalvariables.