简介:Inthispaper,wedemonstratetheacetylehe(C2H2)sensorwithhighsensitivityusingahollow-corephotonicbandgapfiber(HC-PCF).ExperimentsformeasuringC2H2concentrationsingasmixtureareperformed.Usinga2m-longHC-PCFasgascell,thespectrumofacetyleneatn1+n3bandhasbeenmeasured,andtheP11-branchhasbeenselectedforthepurposeofsensing.Aminimumdetectivityof143partspermillionbyvolume(ppmv)forthesystemconfigurationisestimated.
简介:Duetolowactivationcharacteristics,desirablehigh-temperaturestrength,goodresistancetoradiationdamageandusablefabricationproperties,vanadium(V)alloysareattractivecandidatestructuralmaterialsforfusionreactors[1].Irradiationinducedhardening/embrittlementatlowtemperatureisamajorproblemforthematerialsapplicationinfusionreactor[2].Inthisstudy,H/Heionswithvariousenergieswereusedtoirradiateapurevanadium(V)andaValloy(V-4Ti)toobtainadamageplateaufromsamplesurfacetothedepthof1.5m,asshowninFig.1[3].Thedetailsofirradiationparameters(energies,fluences)forHandHeionsareshowninTable1.NanoindentationwasperformedtoinvestigatethehardeningbehaviorofV-4TialloyandpureVunderirradiation.
简介:ThecomplexK3H4GeW9V3O40·8H2OcrystallizedinamonocliiniesystemwithspacegroupP2,Mr=2784.67,a=11.099(3),b=16.452(4),c=13.534(4),β=108.14°,Z=2,V=2348.493,F(000):2456,μ=239.7cm-1,De=3.932g/cm3.ThefinalR=0.083for4528non-zeroreflexions.ThestructureofanionsGeW9V3O40andGeW9O34belongstoA--type.
简介:Theattenuationfactororqualityfactor(Q-factororQ)hasbeenusedtomeasuretheenergyattenuationofseismicwavespropagatinginundergroundmedia.ManymethodsareusedtoestimatetheQ-factor.WeproposeamethodtocalculatetheQ-factorbasedontheprestackQ-factorinversionandthegeneralizedS-transform.TheproposedmethodspecifiesastandardprimarywaveletandcalculatesthecumulativeQ-factors;then,itfindstheinterlaminarQ-factorsusingtherelationbetweenQandoffset(QVO)andtheDixformula.TheproposedmethodisalternativetomethodsthatcalculateinterlaminarQ-factorsafterhorizonpicking.Becausethefrequencyspectrumofeachhorizoncanbeextractedcontinuouslyona2Dtime–frequencyspectrum,themethodiscalledthecontinuousspectralratioslope(CSRS)method.ComparedwiththeotherQ-inversionmethods,themethodoffersnearlyeffortlesscomputationsandstability,andhasmathematicalandphysicalsignificance.WeusenumericalmodelingtoverifythefeasibilityofthemethodandapplyittorealdatafromanoilfieldinAhdeb,Iraq.TheresultssuggestthattheresolutionandspatialstabilityoftheQ-profileareoptimalandcontainabundantinterlaminarinformationthatisextremelyhelpfulinmakinglithologyandfluidpredictions.
简介:H老师:你好!今天我一直为你也为那个孩子担心着。当孩子的爷爷领着他走到我面前的时候,我看到了孩子眼里的委屈甚至还有些许的恐惧——他是真的怕来上学了,被爷爷抓着不得已。孩子的心里一定很无助。整个事情中,我知道这个孩子已经对学习有了厌倦的情绪,学习习惯也没有养成,在班里,他是令老师头疼的学生。而最近的这次不来上学,是因为你在课上的时候让他“罚站”,孩子感觉到尊严受到伤害。我在询问孩子情况的时候,你来到我的办公室,一脸的无奈。,你给我讲述了自己为改变这个孩子所做的事l睛。孩子的父亲正在狱中服刑,母亲常年在外打工,孩子自小由爷爷奶奶看大,生性孤僻,不善言谈。你说,自己在接班时了解到他的情况后,心里格外难过,特别同情这个可怜的孩子。
简介:SpecialReportsandReviewONCOGENESANDCELLIMMUNOGENITY:v-H-rasSUPPRESSINGMHCCLASSIEXPRESSIONINMOUSEFIBROBLASTLuYouyong;吕有勇;Shrag...