简介:1.ContactInformationDepartmentofEntomology,NanjingAgriculturalUniversity,Nanjing210095,ChinaPhone:+86-25-84399025/15251852255E-mail:lifei@njau.edu.cn;lifei03@tsinghua.org.cn2.PresentRanksProfessor,NanjingAgriculturalUniversityReviewingEditor,FrontiersinGeneticsEditorMember,JournalofEnvironmentalEntomology
简介:K2Ti2O5andLixK2-xTi2O5sampleswithvaryingKcontents(x=0.125,0.15,0.3),targetedonremovaloftwomainenvironmentalpollutants:PMandNOx,weresynthesizedbythesolidstatemethodusingTiO2,KNO3andLiOH·H2OasstartingmaterialsandwerecharacterizedbyX-raydiffractometry,scanningelectronmicroscopy,andBET.ThecatalyticactivityoftitanatecatalystsonPMoxidationwasevaluatedusingthetemperatureprogrammedoxidation(TPO)method.ThetestresultsshowedthattheperovskitestructureofK2Ti2O5wasstillretainedafterdopingasmallamountofLi,andthecatalyticperformanceofLixK2-xTi2O5hadbeenimprovedsignificantlycomparedwiththatofK2Ti2O5.Li0.15K1.85Ti2O5catalysthadthehighestcatalyticactivitywithanignitiontemperatureof210℃andapeaktemperatureof290℃.ThecatalyticactivityofbothK2Ti2O5andLixK2-xTi2O5underintimatecontactwashigherthanthatunderloosecontact.Whentheexhaustgasflowratewasaround100mL/min,thecatalystsamplesshowedahighestactivity.TheLidopedK2Ti2O5couldbeanexcellentcandidateforPMoxidationduetoitshighoxidationactivity,waterstability,resistancetosulfurpoisoningandeconomicaladvantages.
简介:用溶胶-凝胶法合成了掺钴的尖晶石锰酸锂Li1.05Co0.05Mn1.95O4,由于Co^3+的引入使得材料结构更加稳定,循环稳定性增强。材料在0.1C下首次放电比容量为105.2mAh/g,循环20次后为104.3mAh/g,容量保持率为99.1%;1C下首次放电比容量为92.4mAh/g,循环20次后放电比容量为91.1mAh/g,容量保持率为98.5%。电池在充电前电荷转移电阻Rct很大,锂离子扩散系数较小,1C循环结束后电极的电荷转移电阻Rct最大为225.2Ω,0.5C循环结束后电极的锂离子扩散系数DLi+最大为6.16×10^-5m^2/s。
简介:摘要目的研究肝肠钙粘连蛋白(LI-cadherin)在原发性肝癌组织中的表达及临床病理学的相关性。方法应用免疫组化ABC法分别检测35例肝癌组织、31例相应癌旁组织和10例正常肝脏组织中LI-cadherin的表达情况,并分析其临床病理学特征的相关性。结果LI-cadherin在正常肝组织中不表达,在肝癌组织中的阳性表达率68.6%(24/35)明显高于癌旁组织22.6%(7/31)和正常组织(0/10)(P<0.05);LI-cadherin在肝癌组织中的表达与与肿瘤直径、门静脉癌栓及淋巴结转移呈负相关(P<0.05),而与患者的年龄、性别、病理学分级无相关性(P>0.05)。结论LI-cadherin在原发性肝癌中高表达,其表达与肿瘤的直径、门静脉癌栓及淋巴结转移呈负相关,提示其在原发性肝癌的发生、发展起一定作用。
简介:探讨了锂离子电池三元正极材料LizN1-x-yCoxMnyO2中过渡金属的平均价态分析方法。样品用盐酸溶解后,在pH值为9至10的情况下,以紫脲酸胺为指示剂,EDTA滴定过渡金属总含量,该方法简单、快速、准确高,测定结果的RSD为0.06%~0.20%。采用间接草酸钠还原滴定,测出三元正极材料中三价过渡金属的总量,也即在稀硫酸介质中,试样被定量的草酸钠还原溶解,剩余的草酸钠用高锰酸钾标准溶液滴定,从而测出试样中三价过渡金属的总量,测定结果的RSD为0.17%~0.50%。将这两种方法结合在一起,就可以求出三元正极材料中过渡金属的平均价态,从而为探讨三元正极材料性能提供重要的指导意义。
简介:Theequilibriumgeometries,relativestabilities,andelectronicpropertiesofMnAgm(M=Na,Li;n+m≤7)aswellaspureAgn,Nan,Lin(n≤7)clustersaresystematicallyinvestigatedbymeansofthedensityfunctionaltheory.Theoptimizedgeometriesrevealthatfor2≤n≤7,therearesignificantsimilaritiesingeometryamongpureAgn,Nan,andLinclusters,andthetransitionsfromplanartothree-dimensionalconfigurationsoccuratn=7,7,and6,respectively.Incontrast,thefirstthree-dimensional(3D)structuresareobservedatn+m=5forbothNanAgmandLinAgmclusters.Whenn+m≥5,astrikingfeatureisthatthetrigonalbipyramidbecomesthemainsubunitofLinAgm.Furthermore,dramaticodd-evenalternativebehavioursareobtainedinthefragmentationenergies,secondorderdifferenceenergies,highestoccupiedandlowestunoccupiedmolecularorbitalenergygaps,andchemicalhardnessforbothpureanddopedclusters.Theanalyticresultsexhibitthatclusterswithanevenelectronicconfiguration(2,4,6)possesstheweakestchemicalreactivityandmoreenhancedstability.