临床麻醉教学形式与实践探讨

21世纪的今天，特别是中国即将加入WTO，它将对我国的社会和经济产生巨大影响，医学也随之与其它科学交互渗透更加紧密。随之带来的卫生改革更加深入，医疗行业竞争日趋激烈，这也给麻醉医学带来新的机遇和挑战。新时期的人才培养已成为高校教育的主题。医学教学形式也将发生变化，适应新时期的要求，改变传统的教学模式，培养创造性人才及创新素质。     

铝厂赤泥中提钪技术的研究

根据赤泥的基本性质和综合处理的现状,研究提高赤泥中稀有金属钪回收率。采用逆流循环浸出赤泥,通过调节浸出过程中各影响因素,最佳工艺条件为：硫酸浓度900～1000g／L,浸出温度90℃以上,液固比5：1,浸出时间4h,钪的综合回收率达到85％以上。     

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.     

锌-铕抗菌材料的制备

通过溶胶-凝胶法制备出Zn-Eu抗菌白炭黑,该产品是一种含有稀土Eu3+的新型无机抗菌材料,与只单载Zn2+的抗菌白炭黑相比,该新型无机抗菌材料的抗菌性能更加显著.通过单因素实验探究Zn2+浓度、Eu3+浓度和反应时间对产品杀菌率的影响,得到最佳制备方案:Zn2+浓度为0.8 mol·L-1、Eu3+浓度0.005 mol·L-1、反应时间1 h.最佳条件下制备得到抗菌性能优良的Zn-Eu抗菌白炭黑,并对其进行FTIR、SEM和ICP-OES表征.FTIR结果显示,Zn2+和Eu3+加入后没有明显改变载体白炭黑的基本结构.SEM和ICP-OES分析表明,Zn-Eu抗菌白炭黑粒径较小,分散性较好并且Zn2+和Eu3+均担载在了载体白炭黑上.     

炭黑生产工艺的进展

介绍了较为成熟的炭黑生产工艺,讨论了其各自在工业应用方面的前景,并对近年来涌现出的一些具有可应用前景的工艺方法进行了简要评述,同时也归纳了近几年炭黑生产工艺的进展表现。     

Internet大潮涌动谁为中国企业导航：由WebChina‘97计划说起

加入WebChina’97计划, 轻轻松松建网点 日前,国内的两家从事计算机互联网络、信息服务和系统集成的股份制企业——中网信息技术公司和韦博利达计算机系统公司联合向大众发布了一项计划,名为“WebChina’97”,译成中文意思应该是“WWW网点资源97年中     

Optimized preparation of zinc-inorganic antibacterial material containing samarium using response surface methodology

A Box-Behnken design(BBD) of response surface methodology(RSM) was used to optimize the preparation of the Zn-Sm antibacterial white carbon black by the sol-gel method. The statistical analysis of the results showed that the particle size of the Zn-Sm antibacterial white carbon black was significantly affected by the reaction time, reaction temperature and the stirring speed. According to analysis of variance(ANOVA), the values of the determination coefficient(R2=0.9821) and the "Pred R-Squared" of 0.8227 were in reasonable agreement with the "Adj R-Squared" of 0.9591. It was indicated that this model could be used to navigate the design space. The optimized reaction time, temperature and the stirring speed were 0.88 h, 87.83 oC, and 473.45 r/min, respectively. In addition, the bacteriostasis rate of the product was about 97.92%.     

赤泥还原焙烧脱铁试验研究

研究了采用还原焙烧法从赤泥中除铁。试验结果表明:铁去除率达80.68%,钪损失率为2%;在400～500℃条件下,Fe2O3转变为Fe3O4阶段的还原反应动力学与界面化学反应控制模型符合较好;550℃以上,反应由界面化学反应和气体内扩散混合控制。     

响应曲面法对银型无机抗菌材料干燥条件的优化

采用溶胶-凝胶法制备银型无机抗菌材料,并通过响应曲面法对干燥过程进行优化,研究表明:当干燥温度为126.62℃,干燥时间为143.72min时,样品的相对失重率可达88.6004%。经实验检测在优化条件下,样品相对失重率平均值为87.8332%,接近预测值,表明所得模型可以反映参数之间的真实关系,可以用此模型对样品的相对失重率进行分析和预测。抗菌实验表明产品对大肠杆菌杀菌效果很好,杀菌率为96.2%。