简介：Tonguesquamouscellcarcinoma(ToSCC)isthemostcommontypeofheadandnecksquamouscellcarcinomaandisthesixthleadingcauseofcancerdeathsworldwide[1].Inclinicaloncology,radiationtherapyisastandardtreatmentusedfortumors.Numerousstudieshaveshownthatconventionalradiotherapyusedincancertreatmentmayincreasetheriskofmetastasisofmalignanttumorcells[2–4].Toimprovepatientsurvival,thepotentialformetastasisoftumorsinresponsetoradiationneedstobeaddressed.

简介：Self-emissionx-rayshadowgraphyprovidesamethodtomeasuretheablation-fronttrajectoryandlow-modenonuniformityofatargetimplodedbydirectlyilluminatingafusioncapsulewithlaserbeams.Thetechniqueusestime-resolvedimagesofsoftx-rays(>1keV)emittedfromthecoronalplasmaofthetargetimagedontoanx-rayframingcameratodeterminethepositionoftheablationfront.Methodsusedtoaccuratelymeasuretheablation-frontradius(δR=±1.15μm),image-to-imagetiming(δ(t)=±2.5ps)andabsolutetiming(δt=±10ps)arepresented.Angularaveragingoftheimagesprovidesanaverageradiusmeasurementofδ(Rav)=±0.15μmandanerrorinvelocityofδV/V=±3%.ThistechniquewasappliedontheOmegaLaserFacility[Boehlyetal.,Opt.Commun.133,495(1997)]andtheNationalIgnitionFacility[CampbellandHogan,PlasmaPhys.Control.Fusion41,B39(1999)].

简介：建立了X射线荧光光谱法测定锌铝铜合金ZnAl6Cu1中铝、铜、铁、硅、镍、铅和镉的分析方法。探讨了各元素的分析条件,比较了不同制样方式及不同放置时间对铝强度的影响。在最佳的仪器分析条件下,测定了微量元素的检出限及主、次元素的精密度和准确度。检出限结果表明：各微量元素的检出限均满足标准要求,Cd和Pb元素的定量限稍高。精密度和准确度结果表明,铝、铜、铁元素的测量相对标准偏差在2.1%~5.9%,分析结果与国家标准方法一致。

简介：Theresultsonadissociationbehaviorofpropanehydratespreparedfrom'drywater'andcontainedunreactedresidualwaterintheformoficeinclusionsorsupercooledliquidwater(watersolutionofgas)werepresentedfortemperaturesbelow273K.Thetemperaturerampingorpressurereleasemethodwasusedforthedissociationofpropanehydratesamples.Itwasfoundthatthemechanismofgashydratedissociationattemperaturesbelow273Kdependedonthephasestateofunreactedwaterinthehydratesample.Gashydratesdissociatedintoiceandgasiftheiceinclusionswereinthehydratesample.Thesamplesofpropanehydrateswithinclusionsofunreactedsupercooledwateronly(withouticeinclusions)dissociatedintosupercooledwaterandgasbelowthepressureofthesupercooledwater-hydrate-gasmetastableequilibrium.

简介：标题化合物C26H26O5以2,3-萘二甲醛和5-甲基-1,3-环己二酮为原料,在醋酸溶剂中,室温下经搅拌多组分一锅法合成得到.其结构通过单晶X-射线衍射法确定,晶体属单斜晶系,空间群P21,相对分子质量Mr=418.47,晶胞参数a=0.99004（8）nm,b=1.09098（9）nm,c=1.04246（11）nm,V=1.08753（17）nm3,Z=2,晶胞密度Dc=1.278g/cm3,吸收系数μ=0.088mm-1,单胞中电子的数目F（000）=444.晶体结构用直接法解出,经全矩阵最小二乘法对原子参数进行修正,最终的偏离因子为R1=0.0533,wR2=0.1293.在晶体结构中新形成的吡喃环为半椅式构象,而茚中五元环则为信封式构象.