简介:Thestudyofstructure,thermodynamicstate,equationofstate(EOS)andtransportpropertiesofwarmdensematter(WDM)hasbecomeoneofthekeyaspectsoflaboratoryastrophysics.Thisfieldhasdemonstrateditsimportancenotonlyconcerningtheinternalstructureofplanets,butalsootherastrophysicalbodiessuchasbrowndwarfs,crustsofoldstarsorwhitedwarfstars.Therehasbeenarapidincreaseininterestandactivityinthisfieldoverthelasttwodecadesowingtomanytechnologicaladvancesincludingnotonlythecommissioningofhighenergyopticallasersystems,zpinchesandX-rayfreeelectronlasers,butalsoshort-pulselaserfacilitiescapableofgenerationofnovelparticleandX-raysources.ManynewdiagnosticmethodshavebeendevelopedrecentlytostudyWDMinitsfullcomplexity.Evenultrafastnonequilibriumdynamicshasbeenaccessedforthefirsttimethankstosubpicosecondlaserpulsesachievedatnewfacilities.RecentyearssawanumberofmajordiscoverieswithdirectimplicationstoastrophysicssuchastheformationofdiamondatpressuresrelevanttointeriorsoffrozengiantplanetslikeNeptune,metallichydrogenunderconditionssuchasthosefoundinsideJupiter’sdynamoorformationoflonsdaleitecrystalsunderextremepressuresduringasteroidimpactsoncelestialbodies.Thispaperprovidesabroadreviewofthemostrecentexperimentalworkcarriedoutinthisfieldwithaspecialfocusonthemethodsused.AlltypicalschemesusedtoproduceWDMarediscussedindetail.MostofthediagnostictechniquesrecentlyestablishedtoprobeWDMarealsodescribed.Thispaperalsoprovidesanoverviewofthemostprominentexamplesofthesemethodsusedinexperiments.Eventhoughthemainemphasisofthepublicationisexperimentalworkfocusedonlaboratoryastrophysicsprimarilyatlaserfacilities,abriefoutlineofothermethodssuchasdynamiccompressionwithz-pinchesandstaticcompressionusingdiamondanvilcells(DAC)isalsoincluded.Somerelevanttheoretic
简介:
简介:扁平的膨胀计测试(DMT)有潜力是在土壤的液化潜力的评估的一个有用工具。在实践,小心地检验是必要的存在为评估液化潜力的基于DMT的方法。我们在高液化潜力区域进行了DMT和锥穿入测试(CPT)检验存在为液化潜力评估的基于DMT的方法。明确地,DMT和CPT在原处在六的各个点一起被进行地点,并且这样利用那些测试结果验证存在是可行的基于DMT的方法。DMT参数,水平压力索引(KD),作为指示物被使用以周期的抵抗比率(CRR)估计土壤的液化抵抗。分析结果表明存在K基于D的液化评估方法将过高估计土壤的CRR,它对液化导致安全的因素的overestimation。另外,由象在以前的研究建议的DMT-KD和CPT-qc之间的关联一样使用CPT-qc的DMT-KD值的评价将比领域大小显著地小。结果反映了存在的那进一步的确认为液化评估的基于DMT的方法是合乎需要的。
简介:Inthiswork,weinvestigatethemethodstoimprovetheperformanceofthesweptsourceat1.0μmbasedonapolygonscanner,includingin-cavityparametersandboosterstructuresoutofthecavity.Thethreein-cavityparametersarethecavitylength,therotatingspeedofthepolygonscanner,andthein-cavityenergy.Withthedecreaseofcavitylength,thespectrumbandwidthbecomeswiderandthedutycyclebecomeshigher.Withtheincreaseoftherotatingspeedofthepolygon,thespectrumbandwidthbecomesnarrower,andthedutycyclebecomeslowerbuttherepetitionratebecomeshigher.Withmoreenergyin-cavity,thespectrumbandwidthbecomeswiderandthedutycyclebecomeshigher.Theboosterstructuresincludethebufferedstructure,secondaryamplifier,anddual-semiconductoropticalamplifierconfiguration,whichareusedtoincreasethesweepfrequencyto86kHz,theoutputpowerto18mW,andthetuningbandwidthto131nm,respectively.
简介:Inthisarticleavariable-domainvariationalapproachtotheentitledproblemispresented.Apairofcomplementaryvariationalprincipleswithavariabledomainintermsoftemperatureandheat-streamfunctionareflrstestablished.Basedonthem,twomethodsofsolution-generalizedRitzmethodandvariable-domainFEM-bothcapableofhandilingproblemswithunknownboundaries,aresuggested.Then,threesamplenumericalexampleshavebeentested.Thecomputationalprocessisquitestable,andtheresultsareencouraging.Thisvariationalapproachcanbeextendedstraightforwardlyto3-Dinverseproblemsaswellastootherproblemsinmathematicalphysics.
简介:Wepropose,inthispaper,touseseveralmultivariateanalysismethodeandanewkindofvariablestoseparatebetweenfourclassesofeventsproducedatLEP2:theeventswith2jets,3jets,4jetsandthosehavingamoreabundantjettopology(njets,n>4)Neuralnetworkhaveproventhemselvestobemoreefficientclassifierthantheothertechniques.Theefficienciesandpuritiesachievedwiththeoptimizedneuralnetworkareinaverage1to7%higherthanthoseobtaindwiththeothermethods.
简介:NanosizedGa-containingZSM-5zeoliteswerepreparedviaisomorphoussubstitutionandimpregnationfollowedbycharacterizedusingvarioustechniques.Thecatalyticperformanceofthezeolitesforthearomatizationof1-hexenewasinvestigated.TheresultsindicatethatisomorphoussubstitutionpromotestheincorporationofGaheteroatomsintotheframeworkalongwiththeformationofextra-frameworkGaO+species([GaO+]a)thathavestrongerinteractionswiththenegativepotentialoftheframework.Inaddition,basedonthePy-IRresultsandcatalyticperformance,the[GaO+]aspecieswithstrongerLewisacidsitesproducedabettersynergismwithmoderateBr?nstedacidsitesandthusimprovedtheselectivitytoaromaticcompounds.However,theimpregnationresultsintheformationofGa2O3phaseandsmallamountsofGaO+speciesthataremainlylocatedontheexternalsurface([GaO+]b),whichcontributetoweakerLewisacidsitesduetoweakerinteractionswiththezeoliteframework.During1-hexenearomatization,thenanosizedGaisomorphouslysubstitutedZSM-5zeolitesamples(Gax-NZ5)exhibitedbettercatalyticperformancecomparedtotheimpregnatedsamples,andthehighestaromaticyield(i.e.,65.4wt%)wasachievedovertheGa4.2-NZ5sample,whichcontainedwiththehighestGacontent.