2—（三氯甲基）—2—丙醇的相转移催化法合成研究

用聚乙二醇－４００作为相转移催化剂合成２－（三氯甲基）－２－丙醇，反应在碱性介质中进行，条件温和，反应温度控制在５～１０℃原料的摩尔配比为丙酮：氯仿：氢氧化钠：聚乙二醇－４００＝１０：１０：７：１．产率为３０．４％。     

动态预补偿器实现鲁棒对角优势

给出一种多变量参数不确定系统鲁棒预补偿器设计方法．该方法设计的鲁棒预补偿器可以使摄动系统为鲁棒对角优势的，因而保证了系统的鲁棒稳定，并且具有保守性小，设计的控制器简单等优点．实际系统设计表明，该设计方法有效而实用．     

海洋平台管接点应力分析三种方法讨论

在同一模型上，用有限元、电测、光测三种方法，研究了一个海洋平合Ｔ型铸造管接点．根据理论计算及试验结果，阐述了有限元法、电测法、光测法在研究海洋平台管接点时的优缺点，指出了在同一模型上，综合应用三种方法研究海洋平台管接点的优越性．为今后研究铸造管接点提出了参考性的意见．     

New dragonflies (Insecta: Odonata: Gomphaeschnidae) from the Yixian Formation in Inner Mongolia, China

Two fossil dragonflies from the Upper Jurassic to Lower Cretaceous Yixian Formation in Liutiaogou Village, Ningcheng County,Inner Mongolia, China are described and illustrated. They are assigned to two new genera and species, I.e., Sophoaeschna frigida gen.et sp. Nov. And Falsisophoaeschna generalis gen. Et sp. Nov. Within the family Gomphaeschnidae Tillyard & Fraser, 1940. This is the first report of Odonata from Yixian Formation in Inner Mongolia and the second record of fossil Gomphaeschnidae from China.     

Approximately optimal tracking control for discrete time-delay systems with disturbances

Optimal tracking control （OTC） for discrete time-delay systems affected by persistent disturbances with quadratic performance index is considered. By introducing a sensitivity parameter, the original OTC problem is transformed into a series of two-point boundary value （TPBV） problems without time-advance or time-delay terms. The obtained OTC law consists of analytic feedforward and feedback terms and a compensation term which is the sum of an infinite series of adjoint vectors. The analytic feedforward and feedback terms can be found by solving a Riccati matrix equation and two Stein matrix equations. The compensation term can be obtained by using an iteration formula of the adjoint vectors. Observers are constructed to make the approximate OTC law physically realizable. A simulation example shows that the approximate approach is effective in tracking the reference input and robust with respect to exogenous persistent disturbances.     

改性木质素系外加剂对水泥砂浆性能的影响

研究了改性木质素系外加剂GCL1-M对水泥砂浆物理力学性能和微观结构的影响,结果表明,GCL1－M砂浆减水率达到30%,掺砂浆28天抗压强度比达到了120%。掺GCL1-M砂浆的渗透压力比达到330%,比掺CLS的砂浆提高了1倍多。氮吸附测试和电子扫描显微观测等结果表明,GCL1-M减慢了水泥水化反应放热速度,降低砂浆的总孔容积,阻塞毛细管通道,提高砂浆的抗渗能力。吸附性能、Zeta电位及环境扫描电镜测试结果表明,GCL1－M在水泥颗粒表面形成网状结构吸附,增加了颗粒间的静电斥力位能,增强了对水泥砂浆的分散和保水作用,有利于提高水泥砂浆的抗渗性能和抗压强度。     

磁流变阻尼器结构被动控制的多目标优化与仿真分析

将MR阻尼器作为被动耗能装置使用,对不同位置的阻尼器施加不同的控制电压,控制电压的大小由多目标遗传算法NSGA-Ⅱ确定。对一装有MR阻尼器的3层框架结构分别输入峰值调整为0.25g的ElCentro波、Kobe波,Hachinohe波和Northridge波进行仿真分析。结果表明,优化方案对位移和加速度的控制都明显优于passive-off方案,对位移的控制效果与passive-max接近,对加速度的控制优于passive-max方案。     

汽车远控防盗抢系统的基本原理及设计

对国内外汽车防盗技术进行综合分析,提出一种新型汽车防盗器,重点突破了汽车防盗防抢的功能,特别是为民用汽车的防盗抢提供了有效的设备,大大地保护人民生命财产的安全.     

西藏农牧区金融生态环境评价

文章以西藏农牧区金融生态环境为研究对象,利用1990-2011年20年间数据,运用因子分析法对农牧区金融生态环境进行评价,分析结果得出西藏农牧区整体金融生态环境不断改善,特别是2005年以来发展速度明显提升.并从促进农牧区经济发展、发展金融市场、改善信用法律环境与建立和谐的政府服务环境四个方面,提出进一步改善西藏农牧区金融生态环境的建议.     

Approximately optimal tracking control for discrete time-delay systems with disturbances

Optimal tracking control (OTC) for discrete time-delay systems affected by persistent disturbances with quadratic performance index is considered. By introducing a sensitivity parameter, the original OTC problem is transformed into a series of two-point boundary value (TPBV) problems without time-advance or time-delay terms. The obtained OTC law consists of analytic feedforward and feedback terms and a compensation term which is the sum of a infinite series of adjoint vectors. The analytic feedforward and feedback terms can be found by solving a Riccati matrix equation and two Stein matrix equations. The compensation term can be obtained by using an iteration formula of the adjoint vectors. Observers are constructed to make the approximate OTC law physically realizable. A simulation example shows that the approximate approach is effective in tracking the reference input and robust with respect to exogenous persistent disturbances.