元素中药防治甲型HIN1流感香囊（袋）的研究和应用

综述了将银、硒、锗、锌、蜂产品、中药方剂、电气石、麦饭石等用纳米技术制成香囊（袋）的研究及其在防治甲型H1N1流感中的应用。     

一类具有时变时滞的中立型系统的稳定性分析

本文研究一类具有状态时滞和输入时滞的时变时滞线性中立型系统.首先,通过选取合适的Lya-punov-Krasovskii泛函,应用LMI方法和Lyapunov-Krasovskii稳定性定理对时滞相关的系统进行稳定性分析,并设计了相应的控制器.改进了时不变时滞线性系统方面的一些结果.最后用实例验证所得到结果.     

一类时滞系统的稳定性分析及控制器设计

研究一类具有状态时滞和输入时滞的时变时滞线性系统.首先,通过选取合适的Lyapunov-Krasovskii泛函,应用LMI方法和Lyapunov-Krasovskill稳定性定理对时滞相关的系统进行稳定性分析,并设计了相应的控制器.改进了时变时滞线性系统方面的一些结果.最后用实例验证所得到结果.     

扩压器入口面积比对自由旋涡气动窗口性能的影响

 针对采用主动式扩压器的自由旋涡气动窗口,实验考察了扩压器入口面积比对扩压器压力恢复性能及自由旋涡气动窗口密封性能的影响。结果表明：入口面积比是影响扩压器压力恢复性能的重要因素;通过优化扩压器入口面积比,可以提高气动窗口密封压比和稳定性。主动式扩压器比传统扩压器具有更小的最佳入口面积比,使气动窗口射流更接近于理想自由旋涡射流;主动式扩压器最佳入口面积比约为2.03。在最佳入口面积比情况下,扩压器内端壁吹气临界驻室压力最低,外端壁吹气压力对密封压力基本没有影响。     

Ultrasonic-induced synthesis of high surface area colloids CeO2–ZrO2

The nanostructures of high surface area ceria–zirconia colloids have been successfully synthesized via a sonochemical method in the presence of polyethylene glycol 600. Their structural characteristics have been investigated using powder XRD, FESEM, BET surface area, TG, and other techniques. The average size of CeO₂–ZrO₂ nanoparticles is estimated to be 3.7 nm using Debye–Scherrer’s equation. The BET analysis indicates that colloids CeO₂–ZrO₂ have a remarkably high surface area of 226 m² g⁻¹.     

岩土的一种强度准则及其变换应力法

基于岩土摩擦性,假设岩土破坏是由其物理空间内特征面上的应力比决定,提出了等效应力比的概念,即物理空间特征面上的剪应力合力与正应力合力的比值.在二维条件下,等效应力比可表示为σ-τ坐标系下与摩尔圆相切的直线扣除截距正切值;在三维条件下,假设在XYZ空间内存在一三维物理空间平面,此三维空间特征平面的等效应力比为影响材料强度特性的决定性因素,基于上述三维空间特征面建立了强度准则并称之为a准则.SMP准则以及广义Mises准则都是a准则的特例,当二维坐标中的截距为零时,则强度准则退化为SMP(spatially mobilized plane)强度准则,而当正切角为零时,则强度准则退化为广义Mises准则.而当截距与外切角均不为零时,则强度准则为介于上述两者之间的一种强度准则,在偏平面上为介于SMP曲边三角形与广义Mises圆形之间的曲边三角形.在子午面上,采用考虑岩土压剪耦合的屈服准则,破坏准则采用幂函数表达式.在偏平面上提出了基于a准则的形状函数,并采用真三维应力状态表示的破坏强度准则表示在三轴压缩路径下以p,q二维应力变量表达的准则公式,推导得到了基于a准则的变换应力公式,可简单地将一般以p,q为基本变量的二维模型转变为三维应力模型.通过强度以及多种应力路径的测试对比,验证了a准则及基于该准则的变换应力公式的合理性.     

负离子远红外纳米银、锌、硒元素中药外治烧烫伤药剂的应用研究进展

烧烫伤为热源造成体表组织的损伤,大面积的深度烧烫伤可并发休克、败毒症等。介绍了用纳米粉碎技术,将中药超微粒化,添加纳米锌、硒等微量元素,加广谱强效纳米银系(AT)抗菌剂、麦饭石纳米粉、远红外二氧化钛、电气石在传统中药配方基础上制成的纳米中药,用于烧烫伤的治疗,提高了药物疗效。     

Selective synthesis of 2-(5-oxo-1-arylhex-1-yn-3-yl)phenyl benzoates via FeCl3-mediated cascade reactions of propargylamines with β-enamino ketones

A mild and efficient FeCl₃-mediated cascade reaction of ortho-hydroxyl propargylamines with β-enamino ketones has been developed. This protocol provided a practical and selective method to synthesize 2-(5-oxo-1-arylhex-1-yn-3-yl)phenyl benzoates via in situ generated alkynyl o-quinone methides following a cascade intermolecular 1,4-conjugate addition/intramolecular nucleophilic addition/reverse Claisen condensation/hydrolysis pathway. Furthermore, a series of 2-(3-oxo-1-arylbutyl)phenyl benzoates with good functional group tolerance were prepared in good to high yields under these reaction conditions.     

2,3,7-三羟基荧光酮-溴代十六烷基三甲铵荧光熄灭法测定微量钛的研究

本文研究在两种表面活性剂(CTMAB,Triton X-100)存在下,六种2,3,7-三羟基荧光酮-9-取代物的胶束增敏荧光反应及钛对它们的熄灭现象。其中以水杨基荧光酮(SAF)-溴代十六烷基三甲铵(CTMAB)的荧光熄灭法测定钛,灵敏度、选择性最好,并优于该显色体系的分光光度法。检出限为5ppb,钛的浓度线性范围是0～0.6μg/10mL Ti(Ⅳ)和0.5～1.5μg/10mLTi(Ⅳ)。测定合金钢和人发中微量钛,取得了满意的结果。     

Effect of three boron flame retardants on thermal curing behavior of urea formaldehyde resin

The purpose of the study was to investigate the effects of three kinds of flame retardant (FR), boric acid, zinc borate, and borax on the thermal curing behavior of urea–formaldehyde (UF) resin. Both pH value and gel time were measured to study the curing characters of the UF resin with different loading levels of FR. In addition, differential thermal analysis was also used to obtain kinetic analyses parameter. The results showed that boric acid decreased pH value of UF resin, and reduced gel time of the UF resin. There are no significant changes of the UF resin curing characters with different loading levels of FR. The activation energies for curing reaction of UF resins in the presence of boric acid, zinc borate, and borax, were 84.37, 84.41, and 118.4 kJ/mol, respectively, higher than that of the control one (75.38 kJ/mol). All FRs showed adverse effect on the curing behavior of the UF resin.