简介：Inthispaper,akindofWeakCurrentTester(WeCT)isdescribed.Itisdesignedtotesttheweakcurrentwhichrangesfrom0.1nAto100μA.Themodulehasdividedthemeasurementrangeintosixsectionsincludingof1nA,10nA,100nA,1μA,10μAand100μA.Thetestercanreceivenotonlypositivepolaritycurrentbutalsonegativepolaritycurrent.Asfarastheprincipleisconcerned,wefirstlyconverttheweakcurrenttoasmall

简介：ＴｅｎｓｏｒＰｒｏｂａｂｉｌｉｔｙＣｕｒｒｅｎｔａｎｄＣｏｎｔｉｎｕｉｔｙ￥ＷｅｉＺｈｉｙｏｎｇａｎｄＺｈｕＹｏｎｇｔａｉＩｔｉｓｋｎｏｗｎｔｈａｔｉｎｑｕａｎｔｕｍｍｅｃｈａｎｉｃｓｗａｖｅｆｕｎｃｔｉｏｎｓｃｏｎｔａｉｎａｌｌｔｈｅｉｎｆ...

简介：Thediscreteiterativemapmodelofpeakcurrent-modecontrolledbuckconverterwithconstantcurrentload(CCL),containingtheoutputvoltagefeedbackandrampcompensation,isestablishedinthispaper.BasedonthismodelthecomplexdynamicsofthisconverterisinvestigatedbyanalyzingbifurcationdiagramsandtheLyapunovexponentspectrum.Theeffectsoframpcompensationandoutputvoltagefeedbackonthestabilityoftheconverterareinvestigated.Experimentalresultsverifythesimulationandtheoreticalanalysis.Thestabilityboundaryandchaosboundaryareobtainedunderthetheoreticalconditionsofperiod-doublingbifurcationandbordercollision.Itisfoundthattherearefouroperationregionsinthepeakcurrent-modecontrolledbuckconverterwithCCLduetoperiod-doublingbifurcationandborder-collisionbifurcation.Researchresultsindicatethatrampcompensationcanextendthestableoperationrangeandtransfertheoperatingmode,andoutputvoltagefeedbackcaneventuallyeliminatethecoexistingfast-slowscaleinstability.

简介：Fromaneconomicalpointofviewboththequalityoftheionexchangeresinsandthetechnologyusedinthefieldofindustrialwatertreatmentareimportantforasuccessfulperformance.Ingeneral,twodifferenttechnologieshavebeenestablishedonthemarket:ThemaindiffernecesbetweentheCO-andcountercurrenttechnologeswillbediscussedanddataconcerningtherequirementofchemicalsforregenerationandthequalityofthedeionizedwaterwillbeopposed.Inadditionseveraldifferentvarietiesofthemoderncountercurrenttechnologies,developedandpatentedbyBayerAG,willbedescribedandtheadvantages,dependingontheapplicationandthedemandonthequalityofthedeionizedwater,pointedout.Inviewofstrongerregulationsconcerningtheconsumptionofregenerationchemicals,andwastewater,andalsobecauseofthesuperiorqualityoftheproducedwater,themarketshareofcountercurrenttechnologieswillcontinuetoincreaseworld-wide.

简介：ThisreportgivesabriefintroductiontokeyThaiorganizations,includingresearchinstitutionsandacademicdepartments,activeinparticletechnology.ThisisfollowedbyadescriptionofthelatesttrendofpowdertechnologyandnanoparticletechnologyinThailand.

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简介：Theionsaturationcurrentisveryimportantinprobetheory,whichcanbeusedtomeasuretheelectrontem-peratureandthefloatingpotential.Inthiswork,theeffectsofenergeticionsontheionsaturationcurrentarestudiedviaparticle-in-cellsimulations.Itisfoundthattheenergeticionsandbackgroundionscanbetreatedseparatelyasdifferentspecies,andthevsatisfytheirindividualBohmcriterionatthesheathedge.

简介：Airdistributionincommercialairlinercabinsisveryimportantforthecomfortandhealthofpassengersandcrew.Experimentalmeasurements,computationalfluiddynamics(CFD)simulations,andinversemodelingarestate-of-the-artmethodsavailableforstudyingtheairdistribution.Thispapergaveanoverviewofthediferentexperimentalmodels,suchasscalemodels,simplifiedmodels,full-scalemockups,andactualaircabins.Althoughexperimentalmeasurementswereexpensiveandtimeconsuming,thedatawereessentialforvalidatingCFDsimulations.DiferentmodelingstrategiesforCFDsimulationswerealsodiscussedinthispaper,includinglargeeddysimulationsandReynoldsaveragedNavier–Stokesequationmodeling.CFDsimulationsweremainstreamapproachesforstudyingtheairdistributionbuttheycouldnoteasilyleadtooptimaldesign.Inversemodelingofairdistributionhasrecentlyemergedintoaverypowerfulandattractivetoolfordesigningtheairdistributioninairlinercabins,althoughmostofthestudieswerepreliminary.

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简介：TheobjectiveoftheApollonprojectisthegenerationof10PWpeakpowerpulsesof15fsat1shot/minute.InthispapertheApollonfacilitydesign,thetechnologicalchallengesandthecurrentprogressoftheprojectwillbepresented.

简介：AbackflowmodelofPSSprocessdescribingthecontinuouscounter-currentionexchangecolumnisproposedinthispaper.Theresultsofsimulationareinagreementwithexperimentaldataconsiderably.

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简介：Thesystemofturbulentthermalconvectionisintroduced.Progressesinrecentdecadesinthefourmajorareasofresearchinturbulentconvectionarebriefyreviewed.Someoftherecenttrendsofthefeldarethendiscussed,whichalsoservetopointoutthatthefuturedirectionsinthisimportantfeldoffuidmechanicslieintheextensiontothenon-standardornon-classicalRayleigh–Bénardconfguration.

简介：Thefatiguelifeofnumerousaerospace,locomotive,automotiveandbiomedicalstructuresmaygobeyond10~8cycles.Determinationoflonglifefatiguebehaviorbecomesextremelyimportantforbetterunderstandinganddesignofthecomponentsandstructures.Initially,beforetheinventionofultrasonicfatiguetesting,mostoftheengineeringmaterialsweresupposedtoexhibitfatiguelifeupto10~7cyclesorless.Thispaperreviewscurrentunderstandingofsomefundamentalaspectsonthedevelopmentofacceleratedfatiguetestingmethodanditsapplicationinultra-highcyclefatigue,crackinitiationandgrowthmechanismsofinternalfracture,S-Ndiagram,fatiguelimitandlifeprediction,etc.

简介：Wereviewthepresentstatusandfutureprospectsoffastignition(FI)researchofthetheoreticalgroupattheIAPCM(InstituteofAppliedPhysicsandComputationalMathematics,Beijing)asapartoftheinertialconfinementfusionproject.SincetheapprovaloftheFIprojectattheIAPCM,wehavedevotedoureffortstoimprovingtheintegratedcodesforFIanddesigningadvancedtargetstogetherwiththeexperimentalgroup.RecentFIexperiments[K.U.Aklietal.,Phys.Rev.E86,065402(2012)]showedthatthepetawattlaserbeamenergywasnotefficientlyconvertedintothecompressedcorebecauseofthebeamdivergenceofrelativisticelectronbeams.Thecouplingefficiencycanbeimprovedinthreeways:(1)usingacone–wire-in-shelladvancedtargettoenhancethetransportefficiency,(2)usingexternalmagneticfieldstocollimatefastelectrons,and(3)reducingtheprepulselevelofthepetawattlaserbeam.TheintegratedcodesforFI,namedICFI,includingaradiationhydrodynamiccode,aparticle-in-cell(PIC)simulationcode,andahybridfluid–PICcode,havebeendevelopedtodesignthisadvancedtargetattheIAPCM.TheShenguang-IIupgradedlaserfacilityhasbeenconstructedforFIresearch;itconsistsofeightbeams(intotal24kJ/3ω,3ns)forimplosioncompression,andaheatinglaserbeam(0.5–1kJ,3–5ps)forgeneratingtherelativisticelectronbeam.AfullyintegratedFIexperimentisscheduledforthe2014project.

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简介：Thisletterpresentsanewanalyticalapproximationforwave(current)-induceddynamicsoilresponseinmarinesediments.Inthemodel,thethird-orderapproximationforwave-currentinteractionsisemployedfortheflowmodel,whileBiot’sdynamicporo-elasticmodelisusedtosimulatetheporousflowinaseabed.Thenewlyanalyticalsolutionisvalidatedwiththefieldobservations.Basedonthesolution,effectsofcurrentsandwave-nonlinearityonsoilresponseareexaminedandaparametricstudywillbecarriedouttoexaminetheinfluenceofcurrentsontheliquefactionpotential.

简介：我们分析磁电机尾巴水流表的垂直结构为两次间隔在哪个期间簇太空船在一安静时间穿过中立的表。Inthe间隔，慢慢地移动的当前的表，和AE的价值索引是相对小的，关于40-130nT。我们发现当前的表的二个例子，与在磁性的赤道的当前的密度最大值(B-x=0)，以及离开中心的一个例子或区分的电流表。在安静时间，没有任何快血浆流动并且没有重要flapping运动，我们直接也观察了区分的当前的表。区分的当前的表可能在当前的表在稳定性以内被联系。这些可能为研究当前的表分叉的机制是重要的。

简介：Asaresultsofmagnetoelasticinteraction,themechanicalbehaviorofcurrent-carryingcoilstructures,suchasdeformationandinstability,isakeyprobleminthedesignofstrongfieldmagnets.Inthispaper,anonlinearmathematicalmodelispresentedtodescribethedeformationandbucklingofD-typecurrent-carryingcoils,basedontheBiot-Savartlawandthebendingtheoryofcurvedbeams.Thebendingdeformation,thecriticalvalueofcurrentforthemagnetoelasticbucklingofthecurrent-carryingcoil,andtheeffectsofthetypeandnumberofsupportsatmiddlepartofthebendingcoilonthecriticalvaluearequantitativelyinvestigatedbyasemi-analyticalandsemi-numericalmethod.Thenumericalresultsareshowntobeingoodagreementwiththeexperimentaldata.

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