分子筛修饰电极中内电子传输机理的研究

【中文摘要】用电化学方法聚合分子筛孔道内的苯胺 , 以聚苯胺分子筛修饰电极为模型研究分子筛修饰电极的内电子传输机理 . NaY分子筛的离子交换点位被苯胺修饰后 , 通过电聚合制得聚苯胺分子筛修饰电极 ( Pan+Y-ZM E ),该电极通过聚苯胺链自身的电子跳跃来实现电子传输 , 且只有通过阴极富集后对溶液中Cd 2+才有响应 ,并能用于测定抗坏血酸。【Abstract】This paper is concerned with the mechanism of intrazeolite electron transfer in zeolite-modified electrodes (ZMEs) where the zeolite have been modified with polyaniline, First, data were obtained from ZMEs prepared with zeolite-Y loading aniline and the electropolymerizing of anilines was performed by cyclic voltammery, Polyaniline might not leak out from zeolite due to the bulk size of polyaniline being bigger than the channel of zeolite-Y. At the absence of electron transfer mediators, the Pan(+)Y-ZME showed the expected presence of electron hopping of adjacent polyaniline cations, Second, the data were obtained for the determining Cd2+ and ascorbic acid using Pan+Y-ZME. The Cd2+ might not be preconcentrated at open circuit and could be done at constant potential. At the absence of ion exchange between zeolite and surrounding electrolyte the electron transfer was performed via the electron hopping, i. e. by an intrazeolite mechanism; rather than by an extrazeolite mechanism. In addition, the ascorbic acid molecule and its anion could not cross zeolite film to base electrode therefore, its current was conducted also by the electron hopping between the chains of polyaniline, Experimental results indicate that the electron transfer of Pan(+)Y-ZME was dominated by intrazeolite processes

一种固定化绿藻细胞的生物电极及其使用和测试方法

物理化学带填

基于PINN神经网络的圆柱绕流部分流场的构建

二维圆柱绕流作为基本的物理模型,很多方法用其验证。目前的研究手段大多是实验和数值计算。本文引入了一种基于物理信息的神经网络模型(PINN)建模的方法,首先介绍了其网络构架的基本原理,对雷诺数100的二维圆柱绕流非定常流场进行CFD数值模拟,得到训练数据。通过网络训练部分流场数据得到的速度压力分布云图与商业软件Fluent得到的速度压力分布云图对比,结果表明PINN模型可以为圆柱绕流问题提供有效的建模方法,为接下来的复杂模型提供一定的基础

Stoichiometric Characteristics of Carbon, Nitrogen and Phosphorus in Leaves of Suadea Salsa under Different Supply Conditions of Nitrogen and Phosphorus of Soils

于2015年5~9月,在黄河三角洲滨海湿地生态试验站设置的野外控制实验,分析土壤氮磷供应比例、氮磷供应量及生长阶段下,优势植物盐地碱蓬(Suaeda salsa)叶片碳、氮和磷的化学计量特征。研究结果表明,随着土壤氮磷供应量增大,盐地碱蓬叶片氮、磷含量都显著增加,碳氮比和碳磷比显著减小;在土壤氮磷低供应量条件下,叶片氮磷比显著低于中、高供应量条件下;随着土壤氮磷供应比例增大,叶片全氮含量、碳氮比和氮磷比显著增大,全磷含量减小,叶片碳磷比在土壤氮磷供应比例最大时才显著增大。在9倍土壤氮磷供应比例和供应量条件下,盐地碱蓬生长阶段是影响其叶片碳、氮和磷化学计量特征的重要因子

以CO_2与SOx的零排放为目标的煤气化反应器的数值模拟

<正> 21世纪石油与天然气日趋匮乏,以煤为原料合成液体燃料具有战略意义,而煤气化技术正是实现煤的高效清洁利用,解决能源危机的关键技术之一。目前大部分煤气化技术的研究是在实验方面,有关煤气化过程的机理不甚清楚。数值模拟煤气化反应器可以得到煤气化反应器内流场及相关反应的数据,有助于了解煤气化过程机理,为工业生产中提高煤气化转化率,减少污染物的排放提供理论指导