H-Zr-MCM-48的合成及其正庚烷异构性能

通过水热法成功合成了锆掺杂的MCM 48（Zr MCM 48）介孔材料,并用离子交换制得H Zr MCM 48催化剂。采用X射线衍射（XRD）、透射电镜（TEM）、氮气吸附 脱附等测试手段对样品进行表征。结果表明,所合成的Zr MCM 48及H Zr MCM 48仍保持立方有序介孔结构,H Zr MCM 48催化剂的酸性及催化稳定性均有所提高。在正庚烷异构化探针反应中,同等反应条件(锆/硅摩尔比为002、反应温度为260℃、反应时间为130 min)下,与Zr MCM 48相比,H Zr MCM 48对正庚烷异构化反应的催化性能更好,转化率和选择性分别达到446%和945%。相对较高的多支链异庚烷产物比例表明,所合成的H Zr MCM 48催化剂对于烷烃异构化有良好的应用潜力。     

Design of structural optimal robust controller

The traditional robust controller is designed to meet the requirement considering both the disturbance and the plant uncertainty while the controller uncertainty is always neglected.The structural optimal robustness of the closed-loop system is proposed based on the analysis of the robust radii of both the plant and the controller.The subspace angle is introduced to measure the "distance" of two subspaces,and its metric is equivalent to the gap metric.The optimal robust controller based on gap metric is designed to control the rate of the line of sight for an electromechancial target tracking system.It is shown from simulations that the optimal robust controller with the biggest robust radius is superior on the ability of disturbance rejection,and high tracking performance when additive uncertainty exists compared with the robust controller with smaller robust radius.     

两级内循环浮选处理三元复合驱污水

利用两级内循环浮选技术处理三元复合驱污水,考察了PAM质量浓度、SDBS质量浓度、污水温度、供气量、pH值和水力停留时间对油-水分离的影响。利用显微镜成像技术分析油粒数量随时间的变化规律。结果表明,PAM的存在能够减小SDBS对油-水分离性能的影响,提高油去除率。三元复合驱污水温度和初始油浓度对油去除率影响较小,而污水pH值、供气量和水力停留时间的影响较大。当pH＞9.5、供气量为1.5~2.0 m3/h和水力停留时间2.0 h时,三元复合驱污水油去除率较高,达到85％以上。显微镜成像显示,油粒直径在3.0~15.0 μm范围,水力停留时间前1.0 h中污水中油粒数量减少较多,而后1.0 h中减少缓慢。