纳米氧化铝粉体的相变研究

本文采用溶胶-凝胶法制备清澈、透明、稳定的勃姆石溶胶,研究结果表明在制备勃姆石溶胶过程中,pH值、摩尔比(异丙醇铝/水)、水解温度、回流温度等对氧化铝的晶型相变有一定的影响;其次烧结温度对氧化铝晶型相变也有影响。     

Electorchemical Studies of Cytochrome c on Electodes Modified by Single—Wall Carbon Naotubes

Single-wall carbon nanotubes(SWNTs) modified gold electrodes were prepared by using two different methods.The electrochemical behavior of cytochrome c on the modified gold electrodes was investigated.The first kind of SWNT-modified electrode (noted as SWNT/Au electrode)was prepared by the adsorption of carboxylterminated SWNTs from DMF dispersion on the gold electrode.The oxidatively processed SWNT tips were covalently modified by coupling with amines (AET) to form amide linkage.Via Au-S chemical bonding,the self-assembled monolayer of thiol-unctionalized nanotubes on gold surface was fabricated so as to prepare the others SWNT-modified electrode (noted as SWNT/AET/Au electrode).It was shown from cyclic voltammetry cxperiments that cytochrome c exhibited direct electrochemical responses on the both electrodes, but only the current of controlled diffusion existed on the SWNT/Au electrode while both the currents of controlled diffusion and adsorption of cytochrome c occurred on the SWNT/AET/Au electrode.Photoelastic Modulation Infared Reflection Absorpthion Spectroscopy (PEM-IRRAS) and Quartz Crystal Microbalance (QCM) were employed to verify the adsorption of SWNTs on the gold electrodes.The results proved that SWNTs could enhance the direct electron transfer proecss between the electrodes and redox proteins.     

我国商业银行风险管理机制探讨

现代银行体系的建立是市场经济取得成功的关键,我国商业银行的经营环境正在发生着重大的变化,尤其在中国加入了WTO后,外资银行进入中国金融市场的速度和力度不断加速,在放松管制、全球化和金融创新的背景下形成的银行业发展趋势下,风险管理机制不仅是银行治理机制的重要支撑,而且是银行提升竞争力的基础和保证,银行改革与发展必须重视风险管理机制建设,因此加快构建我国商业银行的核心竞争力,建立有效的风险管理机制已经成为我国商业银行面临的重大、紧迫的现实课题。     

原子力显微镜相位象的理论和应用

文章讨论了原子力显微镜在轻敲模式下相位象的两类主要理论,简谐近似理论和能量理论;介绍了相位象在软材料如聚合物等表面分析研究上的应用,以及目前相位象研究的新问题。     

方程SL(n)=φe(n)的正整数解

设n,e>1均为正整数，利用初等的方法和技巧，以及Smarandache LCM函数和广义Euler函数的基本性质，讨论e∈{2,3,4,6}或e|φ(n)时，数论函数方程SL(n)=φ_e(n)的可解性，并给出该方程全部的正整数解．     

烟草中游离烟碱水萃取体系定量分析方法

采用烟草本底中加烟碱标样的方法测定游离烟碱回收率,测定结果偏低.从标样加入方式、烟草本身pH值等方面考察对游离烟碱回收率的影响,分析了回收率偏低的原因.结果表明,由于烟草水萃取液是弱酸性的缓冲体系,烟碱标样由游离态转变成结合态,导致回收率偏低.     

牛顿环干涉实验研究

分析了牛顿干涉实验中存在的几个问题，提出了实验过程和数据处理中减少误差的一些方法。     

Electrochemical Studies of Cytochrome c on Electrodes Modified by Single-Wall Carbon Nanotubes

Single wallcarbonnanotubes (SWNTs)modifiedgoldelectrodeswerepreparedbyusingtwodifferentmethods .Theelectrochemicalbehaviorofcytochromeconthemodifiedgoldelectrodeswasinves tigated .ThefirstkindofSWNT modifiedelectrode (notedasSWNT/Auelectrode)waspreparedbytheadsorptionofcarboxyl terminatedSWNTsfromDMFdispersiononthegoldelectrode .TheoxidativelyprocessedSWNTtipswerecovalentlymodifiedbycouplingwithamines (AET)toformamidelinkage .ViaAu—Schemicalbonding ,theself assembledmonolayerofthi…     

GPRS无线通讯模块在热力管道流量计数据上传中的应用

介绍GPRS无线通讯模块在数据传送中的应用方法.介绍流量计算机采用GPRS技术实现数据上传的设计方法.     

GPRS无线通讯模块在热力管道流量计数据上传中的应用

介绍GPRS无线通讯模块在数据传送中的应用方法.介绍流量计算机采用GPRS技术实现数据上传的设计方法.