简介：Thegenerationofplasmawhichcanabsorbmicrowavesiscurrentlyaresearchtopicofinterest.Thiskindofplasmaisoftenproducedbythedischargeorelectron-beamimpactofnoblegases.Inthispaperanalternaticeapproach,combustionplasma,isstudied.Theplasmaisproducedbycombustingsolidgrainspreparedspecially.Sixgroupsofpowdersweremadeandusedtogeneratetheplasma.Thetransmissivityofthewaveinplasmawasmeasuredbyemployingamicrowavescalarnetworkanalysersystem.Inaddition,theelectrondensityandthecollisionfrequencyoftheplasmawereexaminedbymicrowavedouble-frequencydiagnosis.Themeasurementresultsshowedthattheplasmacouldabsorbmicrowavesremarkablywithanaveragetransmissionattenuationbeingmorethan18dBinafrequencyrangeof2GHzto15GHz.Thediagnosisindicatedthattheelectrondensityoftheplasmavariedfrom10~(17)m~(-3)to10~(19)m~(-3)andthecollisionfrequencywasabout5×10~(10)s~(-1).

简介：Theplasmageneratedinthelow-altitudeatmosphereisofhighcollisionfrequencies.Inthispaper,thetransmissioncoefficientsofmillimeter(MM)wavesnormallyincidentupontheplasmawithhighcollisionfrequenciesarecalculatedandanalyzed.Theexperimentalresultsofreflectionandattenuationarepresentedfortheeight-millimeterwavespropagatingthroughtheplasma.BoththecalculatedexperimentalresultsindicatethattheMM-wavesconcernedareattenuatedsignificantlyandreflectedweakly,whenpropagatingthroughtheplasmaofhighcollisionfrequencies.

简介：Anumericaltwo-fluidsimulationofthenon-ionizedradiofrequency(rf)sheathmodel,hasbeencarriedout.Thismodelis'global'andthusapplicabletothesheath,pre-sheathandplasmaregions,Inthemodelallvariablesintheionforcebalanceequation,includingtheelectricalforce,ionpressureandneutralparticlefriction,areconsidered.Themodelissolvedthroughafinitedifferenceschemeandsheathcharacteristicsareobtained.Theeffectsoftheiontemperatureonboththecollisionlessandcollisionalsheathcharacteristicsarediscussed.Thenitisconcludedthat1)themodelisinagoodagreementwithBohmTheorem;2)theiontemperaturehassignificanteffectsontherfsheathcharacteristics.Theeffectsarefarmoresignificantonacollisionalrfsheaththanonacollisionlesssheath.

简介：Ahybridmodelisusedtosimulatethecharacteristicsofacollisionalsheathinacapacitivelycoupledplasma(CCP)drivenbyadualfrequencysourceincludingaRFandapulsedcurrentsourceappliedtothesameelectrode.Thehybridmodelincludesafluidmodelusedtosimulatethecharacteristicsofthecollisionalsheath,andaMonte-Carlo(MC)methodtoobtainbothionenergyandionangulardistributions(IEDsandIADs)impingingonthesubstrate.Theeffectsofthelowfrequencyofthepulsedsourceandthegaspressureonthecharacteristicsofthesheath,aswellastheIEDsandIADs,arestudied.Theresultsshowthattheratioofpulse/RFfrequencyandthegaspressurearecrucialforthecharacteristicsofthesheathandtheIEDs.TheIADsaresignificantlymoresensitivetothegaspressure.

简介：Thepetrologicalresearchontheultra-highpressuremetamorphism(UHP)ofcollisionalorogenindicatesthattheupper-crustalrocksissubductedtodepthsexceeding100km,andreturnedtothesurfacerapidly.Inthisstudy,weinvestigatethethermalstructureofcollisionalorogenasaslabofcontinentallithospherebeingsubductedbeneathanoverridingwedgeofcontinentallithospherebythe2-Dfiniteelementmethod.Theadvectionheattransferduetotheaccretionoforogenicwedgeisconsidered.

简介：Thispaperpresentsaninvestigationontheself-focusing/defocusingofchirpedGaussianlaserbeamincollisionalplasmawithlinearabsorption.WehavederivedthedifferentialequationforthebeamwidthparameterbyusingWKBandparaxialapproximationsandsolveditnumerically.Theeffectofchirpandotherlaserplasmaparametersisseenonthebehaviorofbeamwidthparameterwithdimensionlessdistanceofpropagation.Theresultsarediscussedandpresentedgraphically.Oursimulationresultsshowthattheamplitudeofoscillationsdecreaseswiththedistanceofpropagation.Duetocollisionalfrequency,thelaserbeamshowsfastdivergencewhichcanbeminimizedbytheintroductionofchirpparameter.Thechirpdecreasestheeffectofdefocusingandincreasestheabilityofself-focusingoflaserbeamincollisionalplasma.

简介：Tungstenisregardedasanimportantcandidateofplasmafacingmaterialininternationalthermonuclearexperimentalreactor(ITER),sothedeterminationandmodelingofspectraoftungstenplasma,especiallythespectraathightemperaturewereintenselyfocusedonrecently.Inthiswork,usingtheatomicstructurecodeofCowan,acollisionalradiativemodel(CRM)basedonthespin-orbit-split-arraysisdeveloped.Basedonthismodel,thechargestatedistributionoftungstenionsisdeterminedandthesoftX-rayspectrafromhighchargedionsoftungstenatdifferenttemperaturesarecalculated.Theresultsshowthatboththeaverageionizationchargeandlinepositionsarewellagreedwithotherscalculationsandmeasurementswithdiscrepanciesoflessthan0.63%and1.26%,respectively.Thespectraathighertemperaturesarealsoreportedandtherelationshipbetweenionabundanceandtemperatureispredictedinthiswork.

简介：TheJunggarorogen,Xinjiang,China,isanimportantpartoftheUral-Mongolianorogen.ThecollisionalorogenesisinthisregionoccurredprimarilyintheCarboniferousandPermianwithanevolutionalprocessofearlycompressionandlateextension.MineralizationofgoldandothermetalsintheJunggarorogenoccurredmainlyinthePermianandinafewcasesintheLateCarboniferous.Thedepositsarelargelydistributedinareaswherecollisionalorogenesiswasintensiveandformedinatransitionalstagefromcompressiontoextension.Therefore,goldmineralizationintheJunggarorogenisfullyconsistentwiththecollisionalorogenesisintime,spaceandgeodynamicsetting.ThisindicatesthatthemineraldepositmodelofcollisionalorogenesisisapplicabletoprospectingandstudyoforedepositsintheJunggarorogen.Furthermore,thefactualdistributionofgoldandotherdepositsinthisregionisjustthesameasthecollisionalorogenicmodelpresents.

简介：ThisstudyreportszirconU-PbandHfisotopesandwhole-rockelementaldataforgranodioritesfromtheEastKunlunorogen.ThezirconU-Pbdatingdefinestheircrystallizationageof235Ma.Therocksarecharacterizedbyhigh-Kcalc-alkaline,magnesianandmetaluminouswith（K2O+Na2O）=6.38wt.%–7.01wt.%,Mg#=42–50[Mg#=100×molarMg/（Mg+FeOT）],A/CNK=0.92–0.98,coupledwithhighεHf（t）valuesfrom-0.65to-1.80.Therockswerederivedfrompartialmeltingofajuvenilemaficcrustalsourcewithinnormalcrustthickness.Thejuvenilelowercrustwasgeneratedbymixinglithosphericmantle-derivedmelt（55%–60%）andsupracrustalmelt（40%–45%）duringtheseafloorsubduction.TogetherwithavailabledatafromtheEastKunlun,itisproposedthatthestudiedMiddleTriassicgranodioriteswereformedinpost-collisionalextensionsetting,inwhichmeltingofthejuvenilelowercrustinresponsetothebasalticmagmaunderplatingresultedintheproductionofhigh-Kgranodioriticmelts.

简介：Quasiclassicaltrajectorycalculation(QCT)isusedfrequentlyforstudyingcollisionalenergytransferbetweenhighlyvibrationallyexcitedmoleculesandbathgases.Inthispaper,theQCToftheenergytransferbetweenhighlyvibrationallyexcitedC6F6andN2,O2andgroundstateC6F6wereperformed.TheresultsindicatethathighlyvibrationallyexcitedC6F6transferredvibrationalenergytovibrationaldistributionofN2,O2andgroundstateC6F6,sotheyareV-Venergytransfer.EspeciallyitismainlyV-VresonanceenergytransferbetweenexcitedC6F6andgroundstateC6F6,excitedC6F6transfersmorevibrationalenergytogroundstateC6F6thantoN2andO2.ThevaluesofQCT,-〈△Evib〉ofexcitedC6F6aresmallerthanthoseofexperiments.