Bistable Periodic Traveling Wave Solutions to Lattice Competitive Systems北大核心CSCD

该文研究了一类格竞争系统的双稳周期行波解的存在性.首先,将两种群竞争系统转化为合作系统;其次,构造合作系统的上下解,并建立比较原理,得到当初始函数满足一定条件时,解在无穷远处是收敛的;最后,利用黏性消去法证明系统连接两个稳定周期平衡点的行波解的存在性.     

COPOLYMERIZATION OF 1-OCTENE WITH STYRENE BY RARE EARTH COORDINATION CATALYSTS

The copolymerization of l-octene with styrene catalyzed by rare earth coordination catalysts has been studied for the first time. Some features and kinetic behavior are described. The overall activation energy of the copolymerization was 22.2 KJ/mol and the copolymerization rate could be expressed as R_p=K_p [Nd] [M]~2. (=1.68×10~(-3) L~2/mol~2. S, 50℃, [Oct]/[St]=1). The catalytic activity of various rare earth elements in Ln (naph)_3 for the copolymerization was compared and shows the following sequence: Dy, Y, Yb>Ho>Sm, Gd, Nd>Pr>Ce>La>Tm. Both monomers of l-octene and styrene in the copolymerization by Nd (naph)_3-AlEt_3 have the tendency of constant proportion copolymerization. The structure of the copolymers was studied by ~1H-NMR.     

钠分子1Πg里德堡态光谱研究

通过光学-光学双共振(OODR)光谱方法,研究了钠分子六个高激发1Πg态,对它们进行了振动和转动归属,获得了分子常数和势能曲线.根据里德堡轨道的nlλ特性,将1～101Πg态划分为实贯穿里德堡态和实非贯穿里z德堡态.     

将《新课标》的精神引入高中习题课教学之中——高一"动能定理"习题课改革尝试

《普通高中物理课程标准（实验）》（下称《新课标》）对课程目标提出知识与技能、过程与方法、情感态度与价值观的三维要求．《新课标》在课程实施上提出：“应促进学生自主学习，让学生积极参与，乐于探究，勇于实验，勤于思考．通过多样化的教学方式，帮助学生学习物理知识与技能，培养其科学探究能力，使其逐步形成科学态度与科学精神．”《新课标》突出了培养学生的创新能力．