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Search Results: 1 - 10 of 77276 matches for " 吕兴梅 "
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A NEW METHOD FOR SOLVING THE EIGENVALUE PROBLEM OF A HAMILTONIAN MATRIX
求解Hamilton矩阵特征值问题的一种新方法

,
计算数学 , 1989,
Abstract: In this paper, a new algorithm for computing all the eigenvalues and eigenvectors of aHamiltonian matrix is given. A symplectic similarity transformation is used to convert theeigenvalue problem of a 2n×2n matrix to that of a nxn tridiagonal matrix. The method isespecially applicable to the full Hamiltonian matrix. Some numerical examples are given.
微型气液固三相等温微分浆态床反应器的优化
胡文华,陈斌,高红帅,
化工学报 , 2013, DOI: 10.3969/j.issn.0438-1157.2013.z1.004
Abstract: 针对气液固三相浆态床催化反应中,传递、反应、催化剂的原位表征均比较复杂的问题,为了有利于气、固相均匀分散于液相和反应温度在反应器中实现等温,通过对气液固三相反应工艺特性和反应器性能要求的分析,对微型气液固三相浆态床反应器进行了优化。根据微型浆态床对气液固三相反应分析的要求,采用图像法研究了分布器为G1、G2、G3,砂板直径为2、2.5、3cm反应器中的流体力学性能特征,考察了气体流速、温度、反应器直径及气体分布器对气含率、气泡尺寸、气泡上升速率以及气泡分布的影响,并进行流体动力学模拟计算,确定了微型浆态床反应器的直径为2cm,气体分布器为G3砂板的反应器结构,该反应器可以应用于反应过程中间态及液体产物生成过程的测试。
CTLA-4Ig对大鼠实验性自身免疫性脑脊髓炎的BAEP、SEP的影响
,剑锋,黄河清,陈康宁
第三军医大学学报 , 2006,
Abstract:
盐酸在硫酸镁水溶液中的harned规则
,王琴萍,赵桂贞,陈树森,殿祯
物理化学学报 , 2005,
Abstract:
离子液体中羟丙基纤维素的合成
,贾彩,李坤兰,,张锁江
化工学报 , 2013, DOI: 10.3969/j.issn.0438-1157.2013.z1.011
Abstract: 使用离子液体1,3-二乙基咪唑磷酸二乙酯盐([EEIM][DEP])为反应溶剂主组分来溶解微晶纤维素进行羟丙基化衍生,微晶纤维素和醚化剂在离子液体中均可形成均相,通过碱化、醚化、酸化及洗涤等步骤制备得到不同取代度的羟丙基纤维素。考察了碱化反应温度、反应原料摩尔比、醚化反应时间及酸化剂的种类对羟丙基纤维素产品的收率和摩尔取代度的影响,并采用红外、核磁、TGA等手段对产品结构进行了表征。
盐酸在硫酸镍水溶液中的活度系数
王琴萍,,陈洪涛,周丽华,陈树森,殿祯
物理化学学报 , 2004,
Abstract:
离子液体添加剂对无氰电镀黄铜性能的影响
王倩,杜文朝,李腊梅,,张锁江
科学通报 , 2015, DOI: 10.1360/N972015-00317
Abstract: 钢帘线电镀黄铜常采用先镀铜再镀锌后加热的热扩散法和氰化法.热扩散法能耗较大,而氰化法使用剧毒的氰化物,污染严重.针对此类问题,本文在优化后的一步无氰电镀黄铜镀液中加入离子液体添加剂来进一步改善镀层的性能.采用扫描电子显微镜(SEM)、能谱仪(EDS)和X射线衍射(XRD)分析了镀层的厚度、成分、形貌和组织结构.采用循环伏安法研究了离子液添加剂在电镀黄铜过程中的作用机理.结果表明,在组分为K4P2O7·3H2O200~270g/L,CuSO4·5H2O1~2g/L,ZnSO4·7H2O35~45g/L,H2O2(30%)0.1~0.6mL/L的镀液中加入10~15mg/L离子液体(1-己基-3-甲基咪唑硫酸氢盐([OMIM]HSO4))可以制备出与基体结合力牢固,延展性好,均匀、连续、致密的黄铜镀层,所得镀层质量得到了显著提高.
离子液体BMIBF4性质的研究
杨家振,桂劲松,<>,,张庆国,李华为
化学学报 , 2005,
Abstract: 用最大气泡法和韦氏天平法,在278.15~343.15K范围内测定了离子液体BMIBF4的表面张力和密度;讨论了这个离子液体的体积性质和表面性质;根据离子个头大又极不对称的特点,提出了离子液体的空隙模型.根据空隙模型计算的离子液体恒压热膨胀系数与实验值相比,偏差在10%左右.
ConductivitiesofAlCl3/IonicLiquidSystemsandTheirApplicationinElectrodepositionofAluminium
岳贵宽,,朱艳丽,王慧,张香平,张锁江
过程工程学报 , 2008,
Abstract: SolubilitiesandconductivitiesofanhydrousAlCl3insixkindsofionicliquids(ILs)weremeasured.AmongthesixkindsofILs[bmim]Cl,[bmim]Br,[bmim]BF4,[bmim]PF6,[emim][EtSO4]and[bmim][HSO4],anhydrousAlCl3couldbedissolvedinthefirstfivekindsbutwashardlydissolvedin[bmim][HSO4].TheresultsshowedthatthenominalsolubilitiesofAlCl3inILsincreasedintheorderof[bmim][HSO4]<[bmim]PF6<[emim][EtSO4]<[bmim]BF4<[bmim]Cl<[bmim]Br.ConductivitiesoftheAlCl3/ILssystemsdependedapparentlyonthenominalmolarratioofAlCl3toILs.TheconductivitiesofAlCl3/[bmim]Cl,AlCl3/[bmim]BrandAlCl3/[bmim]PF6systemshadasimilartendencyasafunctionofthenominalmolarratio,thatis,asthemolarratiowasincreased,conductivitiesincreasedfirstandthendecreased,withthemaximumconductivityobtainedatapproximately0.91,1.01and0.51,respectively.ConductivitiesoftheAlCl3/[bmim]BF4exhibitedadentatechangeanddecreasedwiththemolarratioofAlCl3to[bmim]BF4increasingingeneral.WiththeincreasingoftheanhydrousAlCl3amountin[emim][EtSO4],conductivityofAlCl3/[emim][EtSO4]monotonicallydecreased.AlCl3/[bmim]ClsystemwaschosenastheelectrolytefortheelectrodepositionofAl.Preliminaryexperimentalresultsshowedthatdense,adherentandhomogeneousAlcoatingscouldbeelectrodepositedonstainlesssteelbymeansofconstantpotentialtechniqueandthesurfacecoveragewasquitesatisfactory.
ApplicationofFilm-formingAdditivesforIonicLiquidBasedElectrolyte
孙敏倩,胡志强,蔡迎军,董陶,
过程工程学报 , 2012,
Abstract: N-methyl-N-propylpiperidiniumbis(trifluoromethanesulfonyl)imidewassynthesizedfortheapplicationinionicliquidbasedelectrolytesinlithiumionbattery,10%vinylenecarbonate(VC)and10%1,3-propanesultone(PS)wereaddedtotheelectrolytesystemrespectivelyasadditivestoimprovethepropertyofsolidelectrolyteinterfaceandcyclicperformance.Theresultsofcyclicvoltammetryshowedthathomogenousandcompactsolidelectrolyteinterfacefilmformedongraphiteelectrodewhichwasdetectedbyobservingthemorphologyofcycledgraphiteanode.CharginganddischargingperformanceofLiFePO4/Lihalfcellwastestedintheelectrolytewithorwithoutadditives.Theinitialspecificdischargingcapacitieswereincreasedto129.4and123.0mA×h/gbytheadditionofVCandPS,respectively,comparedwiththatofadditive-freeelectrolyte.Thedischargingretentionswere88.9%and84.6%inelectrolytecontainingVCandPSafter10cycles.
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