Directly assembled quantum dots on one dimension ordered TiO2 nanostructure in aqueous solution for improving photocatalytic activity

One dimension (1D) ordered titanium dioxide (TiO2) nanostructured photocatalysts sensitized by quantum dots (QDs) are fabricated. Their morphologies, crystal structures and photocatalytic properties are characterized by scanning elec-tron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and ultraviolet-visible-near infrared (UV-vis-NIR) absorption spectroscopy, respectively. Compared with the original TiO2 nanostructure, the nanostructured TiO2 sensitized by QDs exhibits a good photocatalytic activity for the degradation of methyl orange (MO). The QDs with core-shell structure can reduce the photocatalytic ability due to the higher potential barrier of carrier transport in ZnS shell layer. The results indicate that the proposed photocatalyst shows promising potential for the application in organic dye degradation.     

单晶型LiNi0.8Co0.1Mn0.1O2正极材料的制备及性能对比

基于高镍三元正极材料容量和成本等方面的优异性,通过熔盐法结合高温固相法进行梯度煅烧,成功制备出了具有大尺寸单晶颗粒状的高镍LiNi_0.8Co_0.1Mn_0.1O₂材料,并与传统固相反应煅烧制备的材料进行比对,通过XRD衍射分析其结构特征,反映阳离子混排程度。依托扫描电子显微镜和透射电子显微镜,表征其表面形貌和晶体特征,研究表明:在经过循环伏安测试后,在高倍率测试条件下,循环稳定性和容量保有量的优势明显,契合锂离子电池近些年在快速发展过程中所面临的安全稳定的条件。这种采用熔盐法制备的NCM-811材料为制备微米级单晶型的正极材料提供了新的思路。      

对象映射关系型数据库技术研究

Object Relationship Mapping(简称ORMapping)是将数据库表映射为面向时象系统中的类,表中的每一条记录对应为该类的一个具体对象的技术.通过这种技术,可以在软件开发过程中采用面向对象的方式来处理与数据库相关的部分,比如记录的增加、修改、删除等.利用这个映射框架的机制,对象与关系数据库之间的转换就可以透明地进行,而不用去关心数据库连接、并发性、事务等问题.文章讨论了实现ORMapping的几个关键性技术要点以及ORMapping的性能问题.     

HPF湿法脱硫系统水平衡的探讨

结合HPF湿法脱硫系统生产实际,对影响该系统水平衡的因素进行分析,找出引起脱硫系统脱硫液总量不断增加的主要影响因素,提出了解决脱硫液总量不断增加的措施。