信息技术在数学教学中的应用研究

以多媒体计算机和网络为核心的信息技术在小学数学教学中的运用,使数学教学活动更加丰富多彩,激发学生的学习兴趣,增强学生的主体意识,培养学生的技能,拓展学生探究的时间和空间,引发学生主动、积极、创新的思维,开发学生的智力,促进学生主动学习,主动发展,从而有效地提高课堂教学效率.     

浸没循环撞击流反应器制备牙膏用磷酸氢钙

采用浸没循环撞击流反应器（SCISR），以焦磷酸钠和磷酸三镁为稳定剂，以磷钙液和石灰乳为原料，通过中和反应法制备出了平均粒度10μm的牙膏用微细磷酸氢钙；探讨了反应温度、熟化时间、反应器装填系数、反应终点pH、磷钙液质量浓度等对产品质量的影响。确定了最优操作条件：磷钙液质量浓度1．17～1．19kg／m^3，反应温度42℃，熟化时间2h，反应终点pH6．3，反应器装填系数0．75。得到产品符合HG3257—2001标准。     

液体连续相撞击流特性及其在超细粉体制备中的应用

20世纪90年代以来撞击流领域研究重点转向以液体为连续相。液体连续相撞击流(US)具有有效促进微观混合和存在压力波动的特性,从而有利于超细粉体的制备。实验结果表明,浸没循环撞击流反应器(SCISR)是反应一沉淀法制取超细粉体的一种优越的反应技术装备。     

Microcellular foaming of PE/PP blends

Three different polyethylene/polypropylene (PE/PP) blends were microcellular foamed and their crystallinities and melt strengths were investigated. The relationship between crystallinity, melt strength, and cellular structure was studied. Experimental results showed that the three blends had similar variation patterns in respect of crystallinity, melt strength, and cellular structure, and these variation patterns were correlative for each blend. For all blends, the melt strength and PP melting point initially heightened and then lowered, the PP crystallinity first decreased, and then increased as the PE content increased. At PE content of 30%, the melt strength and PP melting point were highest and the PP crystallinity was least. The blend with lower PP crystallinity and higher melt strength had better cellular structure and broader microcellular foaming temperature range. So, three blends had best cellular structure at PE content of 30%. Furthermore, when compared with PE/homopolymer (hPP) blend, the PE/copolymer PP (cPP) blend had higher melt strength, better cellular structure, and wider microcellular foaming temperature range, so it was more suited to be microcellular foamed. Whereas LDPE/cPP blend had the broadest microcellular foaming temperature range because of its highest melt strength within three blends. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 4149–4159, 2007     

气相色谱法测定油墨中的六种溶剂

本文报道了用气相色谱法同时测定油墨中的正丁醇、丁酮、甲苯、乙酸丁酯、二甲苯、环己酮，这方法具有良好的精密度、回收率和线性关系，测定了四种油墨所含的溶剂。     

原位聚合沉积透明导电聚苯胺薄膜的研究进展

苯胺在化学氧化聚合过程中,可自发地聚合沉积在不同基体表面,形成透明导电聚苯胺薄膜。重点介绍近年来国内外在玻璃、聚合物、纤维织物和二氧化硅基体表面原位聚合沉积透明导电聚苯胺薄膜的研究进展,并探讨了反应机理。展望了透明导电聚苯胺薄膜在光电器件和微电子器件领域的应用前景。     

延长窑用耐火材料使用周期的措施

Φ5.8 m×97 m回转窑用耐火材料的使用周期太短,吨熟料碱性砖砖耗曾达3.0kg以上。从配置、施工、 使用维护和质量管理等方面采取措施后,2003年吨熟料碱性砖砖耗降到0.6kg左右。     

Synthesis and surface characterization of poly(methyl methacrylate)‐block‐polydimethylsiloxane copolymers from macroazoinitiator

Poly(methyl methyacrylate)‐block‐polydimethylsiloxane (PMMA‐b‐PDMS) copolymers with various compositions were synthesized with PDMS‐containing macroazoinitiator (MAI), which was first prepared by a facile one‐step method in our lab. Results from the characterizations of X‐ray photoelectron spectroscopy (XPS), contact angle measurements, and atomic force microscopy (AFM) showed that the copolymer films took on a gradient of composition and more PDMS segments enriched at the film surfaces, which then resulted in the low surface free energy and little microphase separation at the film surfaces. By contrast, transmission electron microscopy (TEM) analysis demonstrated that distinct microphase separation occurred in bulk. Slight crosslinking of the block copolymers led to much steady morphology and more distinct microphase separation, in particularly for copolymers with low content of PDMS. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

Phase inversion and its effect on the properties of polyester polyurethane cationomers

Polyester polyurethane cationomers are prepared using polyester polyol of molecular weight 2000 as soft segments, N-methyl diethanolamine as chain extender, glycolic acid as quaternization agent, methyl ethyl ketone as solvent, and 4,4'-diphenylenemethylene diisocyanate (MDI) as diisocyanate. Properties of the films cast from solutions and emulsions are studied by infrared spectroscopy, dynamic mechanical analysis, thermogravimetric analysis, differential scanning calorimetry, and tensile-elongation testing. Ionization can cause phase separation and produces increased cohesion in the hard domains. The dispersion process can be divided into three stages involving a separation of hard segment aggregates due to adsorption of water on their surface, water entering into hard segment microionic lattics, and finally a rearrangement of agglomerates to form microspheres. The dispersion can disrupt the order in the hard domains and an increased phase separation.     

高分子助剂处理造纸污水的应用研究

采用动态滤水仪模拟造纸湿部滤水成型过程，对高分子助剂在木浆纸污水处理过程中的影响进行了初步的探讨。结果表明，对于木浆造纸污水，两性淀粉、阳离子聚丙烯酰胺、高分子助留剂SG01均能显著降低污水中的总固形物含量，污水的CODCr值也有一定程度的降低，添加1％的两性淀粉、150～200g／t的阳离子聚丙烯酰胺或0．9％的高分子助留剂SG01时，可使污水中的总固形物含量降低40％～55％；而CODCr的去除率则在40％～58％左右。