The reaction of acenaphthene with nitrobenzene

The reaction of acenaphthene with nitrobenzene was investigated in the presence of AlCl₃. The results showed that the reaction proceeded via carboncation-electrophilic substitution reaction and free radical substitution reaction pathway. The products of acenaphthenyl phenylamine and biacenaphthyl could be synthesized by this reaction. The influence of the amount of AlCl₃ and the temperature on the components of products were also studied in this reaction. Foundation item: Supported by the National Nature Science Foundation of China (No. 29676045) Biography: Wu Lin (1965-), male, Postdictor, research direction: PAHs catalytic conversion and its biologic toxicity.     

转杯纺自由纱段形态对其捻度分布的影响

通过对自由纱段的运动及受力分析，对自由纱段形态以及纺纱工艺参数对自由纱段捻度分布的影响进行了研究。研究表明：因自由纱段在杯内成弯曲形状，从而使得自由纱段捻度自假捻盘入口处向剥离点处不断减少，真至剥离点处纱条捻度甚至降到只有设计捻度的40%-80%。为了保证凝聚槽内一定的捻度传递长度，则须适当提高设计捻度，这就揭示了转杯纱设计捻度高于环锭纱的一个主要原因。高速细支时的剥离点纱条捻度相对于低速粗支而言要高，说明只要一些纺纱工艺参数如转杯直径、转杯速度、假捻盘规格等配合得当，转杯纺也可高速稳定地纺制细支纱。     

一类稳态扩散问题的死核估计

考察了一类在化学反应研究中的具有Robin边界条件的非线性稳态扩散问题，由于扮演重要角色的死核边界是先验未知的，即这是一个自由边界问题，首先借助相应Dirichlet问题的解结合极值原理和比较原理，导出了该问题边值的上界和下界，说明死核是存在的，随后利用解在边界上的上，下界，估计了一般区域上死核所在的位置及其形状，这是对已有结果的完善和推广。     

Free Vibration Analysis of Laminated Composite Beams Using Differential Quadrature Method

IntroductionFiber- reinforced composite materials have foundnumerous applications in many engineering fieldsdue to their outstanding engineering properties,such as high strength- to- weight ratio and highstiffness- to- weight ratio.Specially,compositebeams are widely used in the aerospace industry,automobile industry,robotics and sportingappliances.The dynamic characteristics of thesestructures are of greatimportance in the design andservice process.　 As acknowledged by some researchers[1] ,t…     

12-磷钼酸对苯乙烯自由基阻聚反应动力学影响的研究

用膨胀计法研究了12-磷钼酸的自由基阻聚反应动力学，实验证明，在苯乙烯自由基聚合过程中12-磷钼酸确实抑制了聚合反应速率，动力学数据表明，苯忆烯自由基聚合反应速率的改变值与12-磷钼酸浓度的0.16次幂成正比。     

系数间断的Stefan型自由边界问题

本文讨论一维系数间断的Stefan型自由边界问题(1.1)～(1.11).分别证明其弱解与强解的存在性.     

论自发过程

用熵增原理分析讨论了对自发过程的各种现行叙述法和定义,给出了自发过程的严格定义,分析了自由能判据和自由焓判据的实质.