树形化合物的产生、发展及应用

介绍了一类树状高度支化、带有很多末端官能团的新的大分子化合物，同时分别介绍了这类化合物的特征、合成方法和潜在应用，并展望了它的发展研究前景。     

应用反应精馏提高草酸二乙酯酯化率

在分析国内生产草酸二乙酯工艺的基础上,探讨了以固体酸和反应精馏耦合技术合成草酸二乙酯的新工艺,分析了挟带剂、塔釜温度、回流进料比及原料醇酸比对反应酯化率的影响．在使用环己烷作为挟带剂时,合成草酸二乙酯的最佳工艺条件为：反应温度115℃,原料醇酸比10：1,回流进料比3：1．此时,草酸二乙酯的酯化率达到90％以上．     

3DV quality model based depth maps for view synthesis in FTV system

Depth maps are used for synthesis virtual view in free-viewpoint television (FTV) systems.When depth maps are derived using existing depth estimation methods,the depth distortions will cause undesirable artifacts in the synthesized views.To solve this problem,a 3D video quality model base depth maps (D-3DV) for virtual view synthesis and depth map coding in the FTV applications is proposed.First,the relationships between distortions in coded depth map and rendered view are derived.Then,a precisely 3DV quali...     

溴硝基丙二醇的合成和防腐活性研究

合成了防腐剂2-溴-2-硝基-1,3-丙二醇,通过IR波谱和元素分析对其进行表征,并对其防腐性能和毒性研究.     

基于模糊变权法的《动车组结构及原理》教学模式改革评价

文章以《动车组结构及原理》课程为例,结合模糊层次分析法和变权综合法提出一种基于模糊变权法的教学模式改革评价方法。该方法有效降低各评价因素权重的主观性,更好地反映改革的整体评价结果,对同类课程的教学模式改革具有一定的借鉴意义。     

Mobile APP for motivation to learning: an engineering case

Synthesis of Materials is regarded as an important core subject in engineering education. However, many concepts and knowledge in the material synthesis can be rather abstract and difficult to understand by the student learners. Experiments are limited in scope due to lack of equipment, control of toxic materials, and risks of chemical reactions, which often restricts student imagination and student involvement in practical training. These reasons often led to poor learning attitude and learning performance among the students. Rapid developments in Cloud technology and mobile devices have provided new opportunities for developing novel learning tools for material synthesis. This study aims to introduce interest factors as a strategy for promoting learning interest and practical skills among the students. Chemical symbols, experimental themes, texts, and interactive elements were utilized to develop a theme-based Mobile Learning APP for teaching the practical techniques of material synthesis. The Mobile Learning APP was then integrated into a problem-based learning activity. A quasi-experimental design was used to investigate the resulting learning effectiveness from using the developed Mobile Learning APP. Results show that the Mobile Learning APP provided a significant positive effect on learning performance and that most students showed favorable attitudes toward the usage of the mobile learning system.     

微波合成半导体HgS纳米粒子

在甲醛溶液中，以Hg(Ac)2和TAA为原材料，通过微波加热合成了HgS半导体纳米粒子，并用XRD、TEM、紫外光谱进行了表征。     

合成草莓酯的新型催化剂

综述了无机盐、无机酸、杂多酸(盐)、固体超强酸等催化剂催化合成草莓酯的实验情况.结果表明,硫酸铝、CuCl2 ·2H2 O、固体超强酸SO2 -4 -TiO2 /Al2 O3、活性炭固载硅钨酸等催化剂催化合成草莓酯的收率较高,具有一定的工业应用价值.     

同方向简谐运动的合成研究

基于数学的三角函数方法和物理的旋转矢量方法从理论上对同方向简谐运动的合成进行研究,采用计算机的仿真模拟和物理实验演示等方法对同方向简谐运动的合成进行验证。     

一种新型光学纯胡椒醛基氮杂环丙基羧酸酯的合成与表征

为发展新型手性配体,降低手性催化剂的合成成本,检验由芳醛与手性氨基酸酯缩合、还原反应的普适性,以L-丝氨酸为手性源,经酯化,缩合,还原氨化,关环等反应,设计合成了一种新的胡椒醛基氮杂环丙基羧酸酯5,其结构通过IR,1H NMR,13C NMR,HRMS进行了表征.发展了一条高效便捷合成这类具有光学活性化合物的方法.