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简介：ＴｈｅＴｈｅｓｅｓｏｆＭａｓｔｅｒｉｎ１９９６￥／／１）ＣａｔＸｉｃｈｅｎ．ＴｈｅＳｔｕｄｙｉｎｇｏｆａＬａｓｅｒｉｏｎＳｏｕｒｃｅＵｓｅｄｉｎｏｎ－－ｌｉｎｅＭａｓｓＳｅｐａｒａｔｏｒｓ．２）ＣｈｅｎＰｅｎ＇ｇｆｅｉ．ＰｈｙｓｉｃａｌＤｅｓｉｇｎＯ...

简介：ＴｈｅＴｈｅｓｅｓｏｆＤｏｃｔｏｒａｔｅｉｎ１９９６￥／／１）ＬｕＪｕｎ．ＥｘｐｅｒｉｍｅｎｔａｌＳｔｕｄｙｏｆＦｌｕｃｔｕａｔｉｏｎｓＥｘｃｉｔａｔｉｏｎＦｕｎｃｔｉｏｎｓｏｆＨｅａｖｙｏｎｉｎｄｕｃｅｄＤｉｓｓｉｐａｔｉｖｅＲｅａｃｔｉｏｎ．２）...

简介：ＩｎｔｅｒｎａｔｉｏｎａｌＳｃｉｅｎｔｉｆｉｃＥｘｃｈａｎｇｅｓｉｎ１９９６￥／／１）Ｔｗｅｎｔｙ－ｓｅｖｅｎＦｏｒｅｉｇｎＳｃｉｅｎｔｉｓｔｓａｎｄＥｎｇｉｎｅｅｒｓＶｉｓｉｔｅｄＯｕｒＩｎｓｔｉｔｕｔｅ：ＭａｒｃｏＤｉＳｃｉｅｎｔｉｆｉｃＣｏｕｎ...

简介：ＭａｉｎＷｏｒｋｆｏｒＲａｄｉａｔｉｏｎＰｒｏｔｅｃｔｉｏｎＧｒｏｕｐｉｎ１９９６￥ＳｏｎｇＷｅｎｊｉｅ；ＷａｎｇＧｕｉｌｉｎｇ；ＬｉＺｏｎｇｑｉａｎｇ；ＺｈｕＨｏｎｇｂｉｎ；ＦｕＭｉｎｇｄｅｎｇ；ＧａｏＸｉｕｙｉｎｇ；ＭａＨｕｉｆａｎｇａｎｄＺｈｅ...

简介：近代科学进入中国之回顾与前瞻──诺贝尔奖获得者杨振宁博士１９９４年８月１８日在南宁的演讲有机会同大家讨论近代科学进入中国之回顾与前瞻，我很高兴。今天我要谈的是，近代科学如何发源于西方，随后又怎样进入中国的经过。了解这个过程以后，我们就能够对今天中华民...

简介：1996年7月30日至8月3日由国际纯粹物理及应用物理联合会(IUPAP)举办的“大学物理教育国际会议(TheInternationalConferenceonUndergraduatePhysicsEducation)”在美国马里兰大学召开，参加代表有250余人。会议主要讨论：有关物理专业、理工科专业、物

简介：大学基础物理规划(IUPP)的宗旨是改革各种含微积分物理课程。本规划是由美国教师协会、美国物理研究所、美国物理学会支持的。IUPP由（美)国家科学基金科学工程和数学办公室提供资金。

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简介：一、填空题（每空1分，共25分）1．实验室里常用__________等仪器测物体的质量．若宇航员将一质量为2kg的矿石样本从月球带到地球上，它的质量是__________kg，物重是_______N．

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简介：ThedevelopmentoftheHalfWaveResonator(HWR010)isbasedontheChinaADSproject.TheHWR010operatesat162.5MHzandcanprovidemorethan0.78MVofacceleratingvoltagepercavityforprotonwithopt=0.10.ThegoaloftheRFpropertiesistogetalowerheatloadandahigheracceleratinggradient,whicharedeterminedbyahigherR/Q0andlowerpeaksurfacefields(Bpk/EaccandEpk/Eacc).InordertooptimizetheHWRgeometryparameters,CST-MWSisusedtoconducttheRFsimulation.TheoptimizedRFparametersareshowinTable1.

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简介：Thispaperreportsthattheetchingmorphologyofdislocationsin8°off-axis4H-SiCepilayerisobservedbyusingascanningelectronicmicroscope.Itisfoundthatdifferenttypesofdislocationscorrespondwithdifferentdensitiesandbasalplanedislcation(BPD)arrayandthreadingedgedislocation(TED)pileupgroupliealongsomecertaincrystaldirectionsintheepilayer.Itisconcludedthattheelasticenergyofthreadingscrewdislocations(TSDs)ishighestandTEDsislowestamongthesedislocations,sothedensityofTSDsislowerthanTEDs.TheBPDscanconverttoTEDsbutTSDscanonlypropagateintotheepilyerinspiteofthehigherelasticenergythanTEDs.ThereasonoftheformofBPDsarrayinepilayeristhatthebigstepalongthebasalplanecausedbyfacedefectsblockedtheupstreamatoms,andTEDspileupgroupisthatthedislocationsslideisblockedbydislocationgroupsinepilayer.

简介：Catalyticcombustionofpropane-airmixturewasinvestigated.Platinumcatalystsoveraflatstainlesssteelwithγ-aluminawashcoatwereemployed.Theemployedburnerhasthreecatalystssetparalleltothemixtureflow,spacedatanintervalof5,10and15mm.Bothexperimentandnumericalsimulationweremadeatinlettemperatureof553K,inletvelocityof3to7m/sandequivalenceratioof0.3to0.5.Inthenumericalsimulation,two-dimensional,steadystatemodelwasdevelopedtocalculatethetemperatureandspeciesconcentrationingas-phase.Inthismodel.chemicalreactiononthecatalystsurfaceandthatinthegasphasewereassumedtooccurinthree-steps.Thenumericalresultsshowgoodagreementwithexperimentalresults.Itwasfoundthatthepropertiesofthecatalyststronglyaffectthecatalystsurfacetemperature.Especially,thethermalconductivityofcatalysthasagreateffect,whiletheemissivityofcatalysthaslesseffect.

简介：ThefluorescenceemissionandX-raydiffractionofmagenesium8-hydroxyquinolinecomplex(Mgq2)havebeenmeasuredathighpressureupto14GPa.Ithasbeenfoundthatpressurecaninfluencetheemissiondramatically.Atrelativelowerpressure(lessthan2.5GPa)thefluorescenceofMgq2changesslightly,buttheemissiondropsquicklywithincreaseofthepressurewhenthepressuregetshigherthan2.5GPa.TheresultsofinsituenergydispersiveX-raydiffractionathighpressurewithsynchrotronradiationindicatethatthereisaphasetransitionatabout2.5-3GPaforMgq2crystal.2001ElsevierScienceB.V.Allrightsreserved.

简介：Thedeuteronisalooselyboundstateoftwonucleons.Itisnaturaltoexpectotherboundstatescomposedoftwohadrons,thatis,hadronicmolecularstates[1].AftertheobservationbytheBelleCollaboration,theX(3872)wasrelatedtoalooselyboundstateofDˉDimmediatelyduetothefactthatitsmassisneartheDˉDthreshold.Recently,theBelleCollaborationannouncedtwochargedbottomonium-likestructuresZb(10610)andZb(10650)neartheBˉBandBˉBthresholds[2].TheanalysisoftheangulardistributionindicatedbothZb(10610)andZb(10650)favorIG(JP)=1+(1+).AstructureZc(3900)closetotheDˉDthresholdwasalsoobservedbytheBESIIIcollaborationinthedecayofY(4260),Y(4260)!+??J=[3].