简介:Inpursuingexcellentsupercapacitorelectrodes,wedesignedaseriesofM0S2/C0S2compositesconsistingofflower-likedMoS2andoctahedron-shapedCoS2throughafacileone-stephydrothermalmethodandinvestigatedtheelectrochemicalperformanceofthesampleswithvarioushydrothermaltime.Duetothecouplingoftwometalspeciesandabigamountofwell-developedCoS2andMoS2,theresultsindicatedthattheMoS2/CoS2compositeselectrodesexhibitedthebestelectrochemicalperfor-mancewithalargespecificcapacitanceof490F/gat2mV/sor400F/gat10A/gamongallsamplesasthehydrothermaltimereached48h(MCS48).Furthermore,theretentionofMCS48is93.1%after10000cyclesat10A/g,whichmanifeststheexcellentcyclingstability.TheoutstandingelectrochemicalperformanceofMCS48indicatesthatitcouldbeaverypromisingandnovelenergystoragematerialforsupercapacitorsinthefuture.
简介:摘要目的调查分析0~3岁流动儿童保健现状,为有关部门制定相关政策提供理论依据,推动流动家庭对子女保健情况的关注。方法采用随机对照分组实验的方法与问卷调查的方法调查分析,在我市个大广场随机对有家长带领的儿童(主要是流动儿童)进行问卷调查总计300例,从中挑选出0~3儿童230例,再从230例中随机挑选出本地儿童80例设为对照组,流动儿童80例设为实验组,对其保健状况进行分析。结果实验组儿童保健现况不如对照组,实验组患病率、意外伤害率、营养不良率、蛀牙率等儿童保健情况均高于对照组。结论流动儿童保健现状不容乐观,亟待相关部门呼吁社会对其进行关注,关爱流动儿童身体健康。
简介:摘要目的调查分析柳州市区及周边0~6岁儿童中医体质类型分布情况,从而为本地区儿童体质的调理和保健提供理论依据。方法运用横断面调查的方法,采集调查的数据指标,并结合舌像、面像及问诊来分析判定儿童中医体质类型并观察分析其分布情况。结果①518例受调查儿童,单一体质中健康体最多,且以0~1岁年龄为主;偏颇体质依次是肝火体、气虚体最常见。②兼夹体质中以肝火体为主的兼夹体质居多,其次是气虚体和怯弱体。③以气虚体为主的兼夹体质中男性多于女性。④单一体质和兼夹体质中男女性别比差异无统计学意义(P>0.05)。结论柳州市区及周边儿童中偏颇体质类型以肝火体、气虚体为主;兼夹体质中也以肝火体和气虚体两种类型最为常见,在疾病防治工作中应重点关注及加强对肝火体质和气虚体质的辨识干预。
简介:AlthoughGaussianrandommatricesplayanimportantroleofmeasurementmatricesincompressedsensing,onehopesthatthereexistotherrandommatriceswhichcanalsobeusedtoserveasthemeasurementmatrices.Hence,Weibullrandommatricesinduceextensiveinterest.Inthispaper,wefirstproposethel2,qrobustnullspacepropertythatcanweakentheD-RIP,andshowthatWeibullrandommatricessatisfythel2,qrobustnullspacepropertywithhighprobability.Besides,weprovethatWeibullrandommatricesalsopossessthelqquotientpropertywithhighprobability.Finally,withthecombinationoftheabovementionedproperties,wegivetwoimportantapproximationcharacteristicsofthesolutionstothelq-minimizationwithWeibullrandommatrices,oneisonthestabilityestimatewhenthemeasurementnoisee∈Rnneedsapriori‖e‖2≤,theotherisontherobustnessestimatewithoutneedingtoestimatetheboundof‖e‖2.TheresultsindicatethattheperformanceofWeibullrandommatricesissimilartothatofGaussianrandommatricesinsparserecovery.