Effects of the Specific Area and the Thermal Stability of a Polymer on the Catalytic Activities of Polymer Immobilized Co-Pd Catalysts by SAMI

Co-Pd bimetallic catalysts immobilized with four kinds of resins with different specific areas were prepared by means of the solvated metal atom impregnation (SMAI) method. The results of the XRD and the magnetic measurement showed that as the specific area of the resin increased, the particle sizes of Co and Pd on the catalysts with the same metal content decreased, so the catalytic activity of the catalysts for the hydrogenation of diacetone alcohol as well as the reduction of oxygen on the fuel cell electrode increased. Below 140 , the conversion of diacetone alcohol increased as the reaction temperature increased, and above 140 , the conversion decreased because of the rupture of the resin.     

A Fluorescence Optical Fiber Sensor for Amrinon Using a New Oxazole Compound

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In掺杂对水热法合成ZnO晶体形貌的影响

本文采用水热法,在ZnO中添加In2O3为前驱物,3mol/L KOH作矿化剂,温度430℃,填充度35;,反应24h,制备了掺In的ZnO晶体.未掺杂In2O3合成的纯ZnO晶体呈六棱锥状,显露负极面-c{0001}、六棱锥面+p{1011}和-p{1011},一般不显露{0001}面.前驱物中掺杂In2O3所合成的ZnO晶体呈六角片状,直径约为5～20 μm,大面积显露{0001}面,另外还显露正锥面+p{1011}、负锥面-p{1011}和负极面-c{0001}.由此可见In掺杂可以明显的改变晶体的形态,使c轴极性快速生长趋向得到明显改善,有利于降低晶体生长缺陷.当采用ZnO晶片为籽晶时,通过水热反应在晶片上生长了一层掺In的ZnO薄膜,通过Hall参数测量得到晶体膜层的电子迁移率约为22cm2/(V·s),载流子浓度约为2×1020 cm-3,具有良好的导电性,同时也说明In可以微量掺入氧化锌晶体.     

水热合成奇异形态的ZnO晶体

本文采用水热法,以3mol/L KOH为矿化剂,填充度35;,温度430℃,在Zn(OH)2中添加SnCl2·2H2O,添加量为Sn2+:Zn2+=2;条件下,合成出ZnO晶体.产物中除了大量短六棱柱形晶体外,还出现了部分冰激凌形晶体.六棱柱形晶体具有典型的ZnO特征,显露正极面c{0001}、负极面-c{000-1}、柱面m{10-10}、正锥面p{10-11}和负锥面-p{10-1-1}.而冰激凌形晶体有明显的六棱锥晶体外壳,X光能谱(EDS)检测证实晶体各部位的组分均为ZnO.     

The Elastic Continuum Limit of the Tight Binding Model

The authors consider the simplest quantum mechanics model of solids,the tight binding model,and prove that in the continuum limit,the energy of tight binding model converges to that of the continuum elasticity model obtained using Cauchy-Born rule.The technique in this paper is based mainly on spectral perturbation theory for large matrices.     

理论力学研究导向型教学方法探索与实践

基于“创新性、高阶性和挑战度”的教学理念，提出了理论力学课程的研究导向型教学方法。通过引入工程实际的例题、科技前沿及大国工程等案例，培养学生力学建模、分析实际问题的能力以及家国情怀和崇高的价值理念；通过翻转课堂，调动学生的学习积极性；通过课程小论文的研究，培养学生的批判性思维及查阅文献、力学建模、创新性设计和研究复杂工程问题的能力。实践结果表明，学生的学习积极性、翻转课堂参与度及课程的教学效果得到了有效提高。