Poly（styrene-co-divinylbenzene）-PAMAM-IDA chelating resin： Synthesis,characterization and application for Ni（II） removal in aqueous

PS-PAMAM-IDA chelating resins were prepared by low-generations of polyamidoamine（PAMAM） and then chloroacetic acid functionalizing commercially available ammoniated polystyrene matrix, to preconcentrate Ni2＋ from synthetic aqueous samples. Different generations of PAMAM were used to obtain different chelating resins, PS-IDA, PS-1.0G PAMAM-IDA and PS-2.0G PAMAM-IDA. The synthesized resins were characterized by FTIR and elemental analysis. The effect of solution pH, kinetic studies, resin loading capacity, matrix effects etc., on metal ion adsorption to adsorbent phase, were studied by batch method. The PS-1.0G PAMAM-IDA resin was the most excellent adsorbents, with a maximum adsorption capacity of（24.09±1.79） mg/g for Ni2＋ ion at pH=7. The interpretation of the equilibrium data was given by Langmuir isotherms model, and the correlation coefficient values for PS-IDA, PS-1.0G PAMAM-IDA and PS-2.0G PAMAM-IDA resins were 0.992, 0.994 and 0.987, respectively.     

水平轴风机叶片截面与二维翼型的数值模拟

基于叶素理论和Wilson设计方法,参考设定的风力机性能参数,来设计水平轴风机叶片。利用CFD计算流体软件Fluent,对风轮流场实施三维数值模拟;同时,取叶片中3个展向截面,对相应的翼型开展二维数值模拟与研究。通过对比叶片截面和对应翼型附近的流场,发现其间的气动性能存在着一些差异。这一结果可以为三维叶片的设计及优化,提供一定的理论判据。      

从高硅质钒矿浸出液中萃取钒的工艺研究

研究了磷酸二异辛基酯(P204)从高硅质钒矿浸出液中萃取钒的工艺过程,考察了加入还原铁的量、有机相组成和萃取级数对钒的萃取率的影响,设计了正交实验考察p H值、相比、接触时间、静置时间对钒的萃取率的影响;并考察了反萃酸度对反萃率的影响。研究表明:用磷酸二异辛基酯(P204)萃取钒时,经六级萃取萃取率可达91.39%以上;用1.5 mol/L H2SO4经三级反萃,反萃率为89.16%。P204萃取提钒,可以使钒得到纯化与富集,简化后续工艺。     

基于A1840新型数字无线对讲机的设计

对讲机作为短距离通信和移动调度指挥的重要工具,在社会各个行业都有广泛的应用.尤其是随着数字电路技术的发展,新型的对讲机无论在外型还是性能上相对传统的模拟对讲机都有了长足的进步.