简介:1958年2月18日,山东海阳县的老百姓正沉浸在欢度春节的喜庆气氛中,突然从天空传来一阵炮响,大家抬头一看,一架银色小飞机正在打一架大一点的飞机,只见大飞机歪愣一下,但仍在向海上方向飞,那架小飞机却离开了。“观战”的人们以为这架没被打掉的敌机要逃走了,正在着急时,只见又上来一架小飞机,对着敌机又是一通炮击,再看敌机就已歪歪扭扭地向下坠落了。这就是航四师飞行员胡春生和舒积成驾驶米格-15击落的美军配给国民党空军的RB-57A高空侦察机。大家一阵欢呼,这欢呼声中有能亲眼看到空战、特别是干净利索地击落敌机的激动心情。说实在的,世界上没有多少人能有机会见到这种场面。随后,具有强烈国防意识和光荣革命传统的海阳人民,没有忘记自己的责任,立即抄“家伙”准备捉拿跳伞的飞行员。谁知他命短,与飞机同坠大海了。
简介:Energylevels,radiativerates,oscillatorstrengthsandlinestrengthsarereportedfortransitionsamongthelowest97levelsofthe(1s22s22p6)3s23p2,3s23p3d,3s3p3,3p4,3s3p23d,and3s23d2configurationsofRbXXIV.AmulticonfigurationDirac–Fock(MCDF)methodisadoptedforthecalculations.Radiativerates,oscillatorstrengths,andlinestrengthsareprovidedforallelectricdipole(E1),magneticdipole(M1),electricquadrupole(E2),andmagneticquadrupole(M2)transitionsfromthegroundleveltoall97levels,althoughcalculationsareperformedforamuchlargernumberoflevels.Toachievetheaccuracyofthedata,comparisonsareprovidedwithsimilardataobtainedfromtheFlexibleAtomicCode(FAC)andalsowiththeavailabletheoreticalandexperimentalresults.Ourenergylevelsarefoundtobeaccuratetobetterthan1.2%.WavelengthscalculatedarefoundtolieinEUV(extremeultraviolet)andx-rayregions.Additionally,lifetimesforall97levelsareobtainedforthefirsttime.
简介:Objective:ToinvestigatetheeffectsofGinsenosideRb1ontheproliferationofSchwanncellsinculture.Methods:ApplyingMTTassayandThymidineincorporationassay,theeffectsofGinsenosideRb1ontheproliferationofSchwanncellsisolatedfromthesciaticnerveofadultratwerestudied.Results:GinsenosideRb1(10μg/ml)significantlyinducedSchwanncellproliferation,theeffectwassimilartoNGF(50μg/ml).AthighconcentrationsofGinsenosideRb1(1mg/ml),theproliferationofSchwanncellswassignificantlyinhibited.Conclusions:GinsenosideRb1attheoptimalconcentratiosisfoundtobeeffectiveininducingtheproliferationofSchwanncells,butathigherconcentrationsthedrugiscytotoxicforSchwanncells.
简介:【文章摘要】:目前,运营商语音业务以VOLTE业主为主。虽然各运营商4G站点已基本满足用户覆盖需求,但仍存在墙体遮挡、上下行干扰等场景,导致信号信噪比低、路损严重,从而出现丢包现象,而丢包是影响语音业务质量最直接的因素之一。为改善语音用户感知,本文研究了FDD-LTE PUSCH RB资源预留功能。首先对FDD-LTE PUSCH RB资源预留功能进行了分析,确定该功能的能力范畴,主要分为PUSCH RB预留基础功能、PUSCH RB预留增强功能和覆盖增强RB预留功能。然后进一步分析了PUSCH RB资源预留应用场景,主要为高干扰场景和上行弱覆盖两种场景进行应用。最后通过修改基站侧配置,进一步验证对用户感知的改善效果。通过选取现网10个小区进行参数验证,修改PUSCH RB预留参数后,VOLTE下行丢包率实施后改善21.1%,VOLTE上行丢包率改善22.6%,丢包得到很好的改善。
简介:ThispaperdiscussestheRb-Srgeochemicalbehaviourofillitesinthesedimentaryprocess,andpointsoutthatillitesofthelmdandlmtypescouldreachSr-isotopicequilibriumwithitsenvironmentalmediumduringthesedimentaryprocessandinitialstageofdiagenesis,andillitegrainsofdifferentsizeshavevariousRbcontents.Anewdatingmethodforsedimentaryrocks----adatingmodelofillitegrainRb-Srisochron----isestablished,inconsiderationofthegeochemicalprocessofSr-isotopichomogenizationanddifferentiationinthecourseoftheirformationandevolution.Inaddition,thepaperconcernstheapplicationofthedatingmodeltothePrecambrianunmetamorphosedsedimentaryrocksinwesternHenanProvince,whichgivessatisfactoryresultscoincidentwiththegeologicalfacts.