简介：Anewmethodfordeterminingthepartialmeltingdepthofmantle-derivedmagmaandlithosphericthicknessincontinentalregionsisderivedfromREEgeochemistry.ThiseffectivetechniqueusesvariationsintheCe/YbandSm/YbratiosfoundinmainlyvolcanicrocksincontinentalChina.TheratioschangewiththedepthoforiginconsistentwiththecorrelationbetweenlithosphericthicknessandtheCe/YbandSm/Ybratiosfoundinoceanicbasalt.Theseratiosincreaseexponentiallywiththedepthoforigin,thelithosphericthickness,ofawidevarietyofCenozoicvolcanicbasaltandPaleozoickimberliteintheNorthChinaCraton,northeasternChinacontinentandvicinity.Thisfunctionalrelationshipwithdepthisshowninaplotoftheratiosthatformsaconcordiacurve,whichiscloselyexpressedbyformulasusing8-degreepolynomials.Theseprovideamoreaccurategageinmeasuringthelithosphericthicknessthanthetraditionalgeophysicalmethods.Whenappliedtovolcanicrockofdifferentagesitalsorevealshowthethicknesshaschangedovertimeandthus,greatlyaidstheunderstandingofthetectonichistory.RelationsbetweentheCO2content,mineralreactionsandpressureintheupperasthenospherebeneaththebaseofthelithosphereappearstoaffecttheproportionsofREEinpartialmeltsandbringsaboutaclosecorrelationbetweenlithosphericthicknessandtheCe/YbandSm/Ybratiosinmantle-derivedmagmaticrock.Thisthicknessgauge,forbothcontinentalandoceaniclithosphere,providesanewapproachinanalyzingthelithosphericthicknessindifferenttectonicsettingsandgeologictimes.

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简介：Inthispaper,Er/Ybco-dopedfiberamplifiers(EYDFAs)withanYb-bandfiberBragggrating(FBG)atthepumpendtoimprovetheperformanceoftheamplifierissystematicallystudied.TheinfluenceofthereflectivityandcenterwavelengthoftheFBGalongwiththegain-fiberlengthontheperformanceofanEYDFAarenumericallyanalyzed.TheresultsshowthatthewavelengthoftheFBGhascriticalinfluenceontheefficiencyoftheEYDFA,whereastherequirementtoitsreflectivityisrelaxed.Itisaneffectiveandpromisingwaytoimprovetheefficiencyofahigh-powerpumpedEYDFAbyintroducingasuitableYb-bandFBGatthepumpend.Basedontheanalysisoftheunderlyingprinciples,suggestionsforthepracticaldesignandpossiblefurtherimprovementstrategiesarealsoproposed.

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简介：(ＥＣ＋β＋)Ｄｅｃａｙｏｆ１５３Ｅｒａｎｄ１５７Ｙｂ￥ＸｕＳｈｕｗｅｉ；ＸｉｅＹｕａｎｘｉａｎｇ；ＰａｎＱｉａｎｇｙａｎ；ＺｈａｎｇＪｕｐｉｎｇ；ＺｈａｎｇＸｕｅｑｉａｎ；ＷａｎｇＹｉｈａｏ；ＧｅＹｕａｎｘｉｕ；ＹｉｎＸｉｊｉｎ?..

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简介：TheperformancesofhighpowerEr/Ybcodopedfiberlinearcavitylasersareinvestigatednumerically.ThenumericalanalysisisbasedontheiterativesolutionofrateequationsforpopulationdensityoftheEr/Ybions.Thebehaviorsofco-pumpandcounter-pumpmethodsarecontrasted.Dependenceofoutputpoweroninputpumppower,outputreflectivity,operatingwavelengthandactivefiberlengthissimulated,respectively.HighconversionefficiencyEr/Yblaseroutputisobtainedinsimulationsandexperiments.

简介：AmicrocalorimetricmethodwasusedtoevaluatetheactionofYb^3+ionsonthegrowthmetabolismofStaphylococcusaureus.Thepower-timecurvesofthegrowthmetabolismofStaphylo.coccusaureusandtheactionofYb^3+ionswereobtainedbyus-ingstopped-flowmethodat37℃.Forevaluationoftheaction,thegrowthrateconstants(k1andk2)forthelogphase1,logphase2,andthetotalheateffect(Qtotal)forStaphylococcusaureusweredetermined.TheresultsshowthatYb^3+ionsatlowconcentrationshavethestimnlatoryeffectonStaphylococcusau-reusandthatYb^3+ionsathigherconcentrationcouldinhibititsgrowth.

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简介：TheNaYF4:Yb,Ernanocrystalsweresynthesizedviathethermaldecompositionofmetaloleateprecursors.Thenanocrystalsinhexagonalstructurewerehighlyuniformandinsizeof25nm.Thebrightupconversionluminescencewasobservedundertheexcitationof980nmlaserandtheupconversionemissionspectrawereinvestigatedatdifferentpumppowers.Theemissionintensityratioofredlighttogreenlightlinearlyincreasedwithpumppowerincreasing.ThisresultindicatedthatthereexistedalargethresholdpowerofsaturationpumpforthefirstexcitationstateinNaYF4:Yb,Ernanocrystalscomparingtothatinbulkmaterial.

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简介：摘要地层精细划分对比是油田地质的基础，通过地层精细划分对比，可以解决油田开发过程中的许多地质问题，为了解决YB油区含水率较高、自然递减率较快、后期注水等问题，充分利用各阶段的分析资料，对目的层进行地层划分对比，为下一步油田开发方案调整和综合治理奠定必要的基础。

简介：[摘要]小盒透明纸包装机整形装置是通过凸轮摆杆带动上下两组加热器进行开合运动，对完成透明纸折叠和热封的烟包上下两个面进行美容热封。较长时间停机时通过气缸控制加热器脱开，避免烫坏烟包。在实际生产中气缸支撑轴时有发生断裂现象，造成烟包粘连、烟包表面烫坏等质量问题，为了提高支撑轴的使用寿命，通过改进设计，将气缸由单点悬臂梁支撑改为双点支撑，改进后支撑轴的断裂次数明显降低，减少了烟包质量问题，提高了设备的有效作业率，具有较高的应用价值。

简介：Yb3+complexeswithtwonitrilotriaceticacidmoleculeswerepreparedandtheircompositionsweredeterminedasK3[Yb(nta)2(H2O)]*5H2OandNa3[Yb(nta)2]*6H2Obyelementalanalyses.Theirstructureswerecharacterizedbysingle-crystalX-raydiffractionanalyses.IncomplexK3[Yb(nta)2(H2O)]*5H2O,theYbN2O7partformsanine-coordinatemonocappedsquareantiprismaticstructure.IncomplexNa3[Yb(nta)2]*6H2O,theYbN2O6partformsaneight-coordinatesquareantiprismaticstructure.Itcanbeseenthattheoutercations(K+andNa+)greatlyaffectthecoordinationnumberandcoordinatestructurefromtheseresults.

简介：YB55小盒透明纸包装机烟包剔除装置频繁故障，送包座易断裂，维修耗时长、影响设备运行效率。通过对YB55包装机烟包剔除装置结构、工作原理进行分析。找出了引起该问题的原因。对烟包剔除装置针对性的进行改进。通过设计加装剔除辅助加速装置，对相应的电、气系统进行改进，解决了烟包下落时不能够及时离开生产线，卡坏设备零件的问题。降低了设备故障维修时间及设备维护费用，提升设备运行效率。

简介：Thehighrepetitionrate10J/10nsYb:YAGlasersystemanditskeytechniquesarereported.Theamplifiersinthissystemhaveamulti-passV-shapestructureandtheheatintheamplifiersisremovedbymeansoflaminarwaterflow.Inthemainamplifier,thelaserisfour-pass,andanapproximately8.5J/1Hz/10nsoutputisachievedintheprimarytest.Thefar-fieldoftheoutputbeamisapproximately10timesthediffractionlimit.Becauseofthehigherlevelsofamplifiedspontaneousemission(ASE)inthemainamplifier,theoutputenergyislowerthanexpected.Attheendwediscusssomemeasuresthatcanimprovethepropertiesofthelasersystem.

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简介：AcompositetransparentYAG/Yb:YAG/YAGceramicwaspreparedbyanon-aqueoustape-castingmethod.Anopticaltransmittanceof82%wasobtainedatvisiblewavelengthandaround1100nm.Alow-threshold,broadbandtunablecontinuous-wave(CW)laserat1031nmwasfurtherdemonstratedfromtheceramicsample,whichwaspumpedbya974nmfiber-pigtailedlaserdiode.Thethresholdpumppowerwas0.45Wandthemaximumoutputpowerwas3.2W,correspondingtoaslopeefficiencyof20.4%.ByinsertinganSF57prisminthelasercavity,theoutputwavelengthcouldbetunedcontinuouslyfrom1021to1058nm.