银型抗菌白炭黑的改性研究

通过添加表面活性剂和有机溶剂对银型抗菌白炭黑进行改性研究。运用ICP、粒度分布仪对改性后银型抗菌白炭黑中抗菌离子含量、粒度分布进行表征;利用菌落计数法对改性后材料的抗菌性能进行研究;并与未改性的银型抗菌白炭黑进行比较。结果表明,改性后的银型抗菌白炭黑中抗菌离子含量高于未改性前;结构较改性前松散,且分散性好;粒径主要分布在3~6μm且均一;具有较好的热稳定性和光稳定性。     

Mechanism of antibacterial activity of silver and praseodymium-loaded white carbon black

This paper investigated the antibacterial mechanism of the Ag-Pr-antibacterial white carbon black.The sol-gel method was used to prepare the carrier:white carbon black.Silver ion was selected to be the antibacterial ion,and praseodymium nitrate was selected to be the additive.The structure and antibacterial mechanism of this new inorganic antibacterial material were characterized by laser particle size analyzer,scanning electron microscope(SEM) techniques,energy dispersive spectrum(EDS) analysis,and antibacterial activity test(Escherichia coli as experimental bacterium).Results showed that the particle size of Ag-Pr-antibacterial White carbon black was less than 30 μm with a narrow size distribution.Ag+ is combined into the white carbon black by both the mode of ion exchange and the mode of adsorption process.The bacteriostasis rate of the Ag-Pr-antibacterial white carbon black was higher than that of the general Ag-antibacterial white carbon black.The antibacterial activity of Ag-Pr-antibacterial white carbon black was caused by the combination of contact and stripping antibacterial mechanism.The result also indicated that this new inorganic antibacterial material had good thermal and light stability.     

基于粗糙集的概念格约简构造算法

主要通过对概念格和粗糙集进行了讨论,给出了他们之间的联系,将二者有机结合,并利用粗糙集的属性约简方法给出了一个约简并构造出约简后的概念格的方法.本文的方法不仅使用了粗糙集约简的方法,而且还同时构造出了约简后的概念格,对于数据较大的形式背景下的概念格,该算法可以使对自己有用的感兴趣的信息更加突出,输出的概念格也更简洁,空间和时间复杂度都有所降低.