简介:目的:分析3种流感病毒(H1N1、H3N2、乙型)的流行病学特点及其感染患者的血常规结果,为类流感患者的临床预防、诊断和治疗提供新的思路和依据。方法:统计2010年1月至2012年12月在本院发热门诊就诊,且经病毒核酸检测证实的421例H1N1、H3N2及乙型流感患者,同时采集其手指末梢血进行血常规检查,用SPSS19.0统计软件对其流感病毒流行趋势进行分析。结果:H1N1、H3N2、乙型流感病毒的暴发没有特定规律,但有阶段性。421例类流感患者的血常规分析中,白细胞总数正常者311例(73.87%)、增高者86例(20.43%);中性粒细胞百分比增高者313例(74.35%);淋巴细胞百分比降低者274例(20.43%)。3种流感患者的血常规结果经t检验后提示,H1N1与H3N2流感患者的白细胞总数、中性粒细胞百分比及淋巴细胞百分比间均无统计学差异(P〉0.05),而H1N1及H3N2与乙型流感患者间的白细胞总数、中性粒细胞百分比及淋巴细胞百分比都存在统计学差异(P〈0.01)。结论:H1N1、H3N2、乙型流感病毒的爆发无规律.但可在一定阶段流行.因此对类流感患者的监测要坚持全年并严密防范。流感病毒阳性患者主要以白细胞总数正常、中性粒细胞百分比增高及淋巴细胞百分比降低为主,但H1N1、H3N2流感患者比乙型流感患者的白细胞总数、中性粒细胞百分比要高.而其淋巴细胞百分比则相对乙型流感患者要低。故对于血常规检测结果与流感病毒感染的通常血象变化不符.但临床高度怀疑为流感病毒感染者.在抗菌治疗效果不明显时,应考虑作咽、鼻拭子病毒核酸检测.以进一步确诊。
简介:Thetetranuclearalkyltin(Ⅳ)compounds{[R2Sn(C9H8N3O3)O]SnR3}2[R=n-Bu(1),4-CNC6H4CH2(2),C6H5CH2(3),4-ClC6H4CH2(4)]werepreparedbythereactionofSchiffbaseligandpyruvicacidisonicotinylhydrazonewith(R3Sn)2Ointhecorrespondingmolarratioof1:1.Allcompoundshavebeencharacterizedbyelementalanalysis,IRand^1HNMRspectra.Thecrystalstructureofcompound1wasdeterminedbyX-raysinglecrystaldiffractionalanalysis.Thiscompoundexhibitsadimericstructurecontainingdistannoxaneunitswithtwotypesofthetinatoms.Forthefirsttinatom,itappearstobeseven-coordinatedwithadistortedpentagonalbipyramidgeometry,andtheotherisfive-coordinatedwithadistortedtrigonalbipyramidalgeometry.Themoleculesarepackedintheunitcellintwo-dimensionalnetworkstructurethroughaninteractionbetweentheNatomsofthepyridineandthetinatomsofanadjacentmolecule.
简介:4个欧洲国家将获得第一批366架战术运输和海军护卫舰直升机,这是欧洲缔结的最大防御交易之一。来自意大利、德国、法国和荷兰的国防与武器负责人签署了一项政府间的协议,向NH工业公司购买295架NH—90,价植63亿美元,加上购买选择权,这次交易价值85.9亿美元。仍然要签订的合同是制造工具和所有设备,还有打算为德国制造的搜索与救援型的15套全套部件。
简介:FieldlysimetermethodwasemployedtoinvestigatethedownwardmovementandleachingofNappliedtosummercorn(ZeamayL.)ondrylandsoilinBeijing,AN-fertilizer(120kgNhm^-2)andacontroltreatmentwerarrangedforthestudy.Soilsolutionwascollectedatdepthsof20,40,60,120and170cm,whileleachtewasollectedatthebottom(220cm)ofthelysimeter,TheresultsshowedthatthedownwardmovementofNO3^-Ninsoilprofilewasgreatlyaffectedbyrainfallpattern.ThepeakofleachedNO3^-Nfrombothtreatmentscoincidedwiththepeakoftherainfall.Inaddition,leachedNO3^-Nfrombothtreatmentsandrainfallweresignificantlycorrelated(P<0.05).TheamountofleachedNO3^-NwasnotgreatintheN-fertilizertreatment,TheresultsalsosuggestedthatNfertilizationcouldcauseNO3^--Ncontaminationofgroundeaterduringtherainyseason.
简介:DenseSi3N4BNcompositeceramicswerefabricatedbysparkplasmasinteringat1500,1600and1650℃under50MPafor5minusingSi3N4andBNpowdersasstartingmaterialsand2mass%Al2O3and6mass%Y2O3assinteringadditives.ThevolumefractionofBNinSi3N4BNcompositepowderswaschosenas10%,20%,and30%,respectively.TheresultsofXRDandSEMshowthatα-Si3N4completelyturnsintoβ-Si3N4whenthecompositeceramicsaresinteredat1650℃;theadditionofBNhindersthegrowthofSi3N4grains,refiningthestructure;VickershardnessandfracturetoughnessofthecompositeceramicsdecreasewiththeincreaseofBNcontent.
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简介:RemanspectroscopyisusedasatooltomonitorthereactionbetweenN,N’-di(pmethyl)monothioxamidesand1,3-diaminetrimethyleneandtodetectthereactionintermediate.Byobservingchangesof1024cm-1C=Sbandandappearanceofanewbendataround1720cm-1,thereactionmechanismisdiscussed.
简介:ThepolycrystallinephaseWO3/g-C3N4wassynthesizedunderstirringusingtungstenicacid(H2WO4)andgraphiticcarbonnitride(g-C3N4)asrawmaterials.ThecatalystwascharacterizedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM),energydispersivespectroscopy(EDS),theFouriertransforminfraredspectroscopy(FT-IR),andtheBrunauer-Emmett-Telleranalysis(BET).ThepolycrystallinephaseWO3/g-C3N4wasdeterminedbyXRDtechnique.TheoxidativedesulfurizationprocesswasinvestigatedusingWO3/g-C3N4asthecatalyst,30%hydrogenperoxide(H202)astheoxidant,and1-butyl-3-methylimidazoliumtetrafluoroborate([bmim]BF4)ionicliquids(ILs)astheextractant.Theoperatingconditions,includingH2WO4amount,ILdose,H2O2volume,temperature,catalystdosage,andtypesofsulfurcompounds,weresystematicallyresearched.Thedesulfurizationratecouldreach98.46%forremovingdibenzothiophene(DBT)fromthemodeloilunderoptimalreactionconditions.Inaddition,thecatalyticactivitywasslightlydecreasedafterfiverecyclesofcatalysts.Thereactionkineticsanalysisshowsthattheoxidativedesulfurizationsystemwasinaccordwiththefirst-orderreactionkineticsequation.Themechanismofoxidativedesulfurizationwasproposed.
简介:采用密度泛函理论的第一性原理方法对氨(NH3)在Ru(1120)表面的吸附和脱氢反应进行了研究。通过清洁表面模型的计算,找到NH3及其脱氢中间产物NH2、NH和N在表面的稳定吸附位,进而研究了NH3逐步脱氢的反应过程。结果表明:第二步的脱氢反应为整个过程的速控步,NH3脱氢的中间产物主要是NH2和NH,从理论上阐明了NH3在Ru(1120)表面脱氢的微观过程。
简介:采用一步法合成了氨基化四氧化三铁(NH2-Fe3O4)磁性纳米材料,并以XRD,IR等手段对其进行了表征.将NH2-Fe3O4组装到磁性玻碳电极表面,得了NH2-Fe3O4修饰的磁玻碳电极,并以该修饰电极为工作电极,研究了其电化学性能.利用差分脉冲溶出伏安法研究了铅(Ⅱ)离子和铜(Ⅱ)离子在该修饰电极上的电化学行为.结果表明:NH2-Fe3O4纳米粒子可显著提高Pb2+和Cu2+在电极表面的富集量,提高溶出峰电流.由于差分脉冲溶出伏安曲线中Pb2+和Cu2+的溶出峰电位差较大,且没有相互干扰,所以该电极可用于Pb2+和Cu2+的同时测定.
简介:Dynamicsinpartialtransientliquidphasebonding(PTLPbonding)ofSi3N4ceramicwithTi/Cu/Timulti-interlayerwassystematicallystudiedthroughmicro-analysisofjointinterfaces.Theresultsshowthatgrowthofreactionlayerandisothermalsolidificationprocessiondoatthesametime.GrowthofreactionlayerandmovingofisothermalsolidificationinterfaceobeytheparaboliclawgovernedbythediffusionofparticipatingelementsduringthePTLPbonding.Coordinationoftheabovetwodynamicsprocessisdonethroughtimeandtemperature.Whenreactionlayerthicknessissuitableandisothermalsolidificationprocessisfinished,thehighbondingstrengthatroomtemperatureandhightemperatureareobtained.