Adsorption and decomposition of H2S on Pd(1 1 1) surface: a first-principles study

Gradient-corrected density functional theory was used to investigate the adsorption of H₂S on Pd(1 1 1) surface. Molecular adsorption was found to be stable with H₂S binding preferentially at top sites. In addition, the adsorption of other S moieties (SH and S) was investigated. SH and S were found to be preferentially bind at the bridge and fcc sites, respectively. The reaction pathways and energy profiles for H₂S decomposition giving rise to adsorbed S and H were determined. Both H₂S_(ad) → SH_(ad) + H_(ad) and SH_(ad) → S_(ad) + H_(ad) reactions were found to have low barriers and high exothermicities. This reveals that the decomposition of H₂S on Pd(1 1 1) surface is a facile process.     

基于Java EE多层架构的进销存管理系统

针对传统的进销存管理系统的开发方式所带来的一些问题,提出使用基于S2SH框架的N层体系结构来开发系统,介绍Struts2、Hibernate和Spring三个框架,分析系统功能,阐述系统实现所使用的一些关键技术,并使用基于S2SH框架的N层体系结构对系统进行总体架构设计,有效提高了系统的可维护性、可扩展性和可复用性。     

32位和8位单片机的无线传感器网络系统

采用STM32F10X系列的芯片为主芯片、SH79F32为辅芯片,温度传感器DS18B20做采集工具,PTR8000无线模块做通信工具,实现无线传感器网络功能。通过Altium Designer Release 10进行原理图设计及PCB板的绘制,并制作电路板、焊接电路板,之后利用Keil软件设计程序,实现不同单片机之间的无线传感器网络通信,并完成了无线通信平台的设计与制作。     

负载型钼基催化剂的制备及其合成甲硫醇的性能研究

本文采用等体积浸渍法制备了一系列负载型钼基催化剂,系统研究了不同K/Mo摩尔比、第二助剂和不同载体的钼基催化剂对混合气(CO/H2S/H2)制备甲硫醇性能的影响.由催化剂的活性评价可知,当K/Mo摩尔比为2.0时,催化剂具有最大的反应活性;分别添加铁、钴和镍3种过渡金属制备的催化剂对甲硫醇的选择性大小顺序为:CoNiFe;比较SBA-15和Si O2两种载体,发现K-Mo-Co/SBA-15的催化活性明显高于K-Mo-Co/Si O2,甲硫醇的选择性达到46.77%.实验分别采用N2-吸脱附、XRD和H2-TPR等手段对不同K/Mo摩尔比和负载2种不同载体的钼基催化剂进行了表征,并对催化剂的结构和性能进行了探讨.     

直缝焊管焊缝质量电磁超声检测方法研究

为实现直缝焊管焊缝内缺陷检测,采用周向电磁超声SH0导波检测技术,研究了基于磁致伸缩效应激励周向SH0模态导波,确定了周向SH0导波激励频率,设计了一款一发双收差分接收的直缝焊管焊缝缺陷检测探头。结果表明:该系统能够激发单一模态周向SH0导波,实际波速与模型分析结果吻合;针对直径116 mm、壁厚3.5 mm的激光直缝焊管焊缝的Φ0.6 mm盲孔和Φ1.0 mm通孔,通过差分探头的信号处理,能够实现焊缝处Φ1.0 mm通孔和Φ0.6 mm盲孔缺陷的检测。     

基于SH4 7751开发平台的Linux移植

描述了将Linux2.6内核移植到新开发板上的方法与过程,并且通过实际项目实践来验证,重点突出了代码构架及相关编码.     

Effect of heat treatment on foaming properties of ostrich (Struthio camelus) egg white proteins

The effect of heat-treatment on foaming properties of ostrich albumen was investigated. At pH 7.5, coagulation of ovotransferrin (OT) resulted in minimum foaming capacity (FC) and maximum foam density (FD). While both exposure of sulfhydryl groups of ovalbumin (OV) and OT-OV interactions improved FC at lower pH, neither of them had beneficial effect on FC at pH 9. At pH 9, FC and FD were mildly affected by heat-treatment because of less aggregation of OT, then FC decreased due to covalent aggregates composed of ovomucin and OV, but at higher temperatures, higher level of OV unfolding resulted in enhanced FC.     

钢板缺陷的磁致伸缩SH0模态导波扫查传感器

研制了一种具有优化检测线圈和高激发效率的传感器。通过在矩形截面检测线圈内布置导磁性屏蔽层,减小矩形线圈上、下导线形成的动态磁场的相消程度,在降低线圈高度的同时保持线圈的导波检测能力;采用U型永磁磁路对铁钴合金带材进行恒定磁化,提升传感器的导波激发效率,采用有限元仿真优化了永磁磁路的磁极间距和高度;利用研制的扫查传感器在含缺陷钢板中进行了测试。结果表明:相比剩磁状态,永磁磁路磁化时传感器对回波信号的检测能力明显提升,扫查过程中检测信号波形峰峰值的变异系数小于91.%,具有良好的稳定性。