强旋湍流气-固两相流动和煤粉燃烧数学模型及其在涡旋燃烧炉的应用(Ⅰ)——模型

结合新型燃煤涡旋燃烧炉的研制和冷、热态实验,建立并发展了二维强旋湍流气固两相流动和煤粉燃烧的数学模型,以此作为对涡旋燃烧炉内多相流动。传热和燃烧过程进行数值模拟和分析的基础。     

亚像素级模糊图像配准算法

针对目前的特征点匹配算法不能有效配准边缘模糊的图像,提出一种灰度偏移极值特征。将局部像素灰度偏移均值最明显的点作为特征点,利用最小二乘拟合曲线,通过曲线导函数将偏移极值点精确定位于亚像素级,最后采用分块的NMI为特征点分配32维特征向量,再对比向量间距离以实现配准。该特征易于提取、运算简单,而且能在阶跃边缘不清晰的图像中稳定存在。经实验验证,算法应用于模糊图像配准具有较高的匹配精度。     

Novel method for preparation of quaternary ammonium ionomer from epoxidized styrene–butadiene–styrene triblock copolymer and its use as compatibilizer for blending of styrene–butadiene–styrene and chlorosulfonated polyethylene

A novel method for the preparation of a quaternary ammonium ionomer of styrene–butadiene–styrene triblock copolymer (SBS) was developed by a ring‐opening reaction of epoxidized SBS with triethylamine hydrochloride in the presence of a phase transfer catalyst. The optimum conditions were studied. The ionomer was characterized by quantitative analysis, IR spectroscopy, and ¹H‐NMR spectroscopy. Its water absorbency, oil absorbency, dilute solution viscosity, and use as a compatibilizer for the blending of SBS and chlorosulfonated polyethylene (CSPE) were investigated. The results showed that, under optimum conditions, the epoxy groups can be completely converted to the quaternary ammonium groups. The IR spectrum did not exhibit the absorption peak for quaternary ammonium groups, whereas the ¹H‐NMR spectrum and titration method demonstrated it. With increasing ionic group content, the water absorbency of the ionomer increased whereas its oil absorbency decreased. These indicated the amphiphilic character of the SBS ionomer. The dilute solution viscosity of the ionomer in toluene/methanol (9/1) solvent increased with increasing quaternary ammonium group content. The ionomer was used as a compatibilizer for the blends of SBS and CSPE. The addition of a small amount of the ionomer to the blend enhanced the mechanical properties of the blends: 2 wt % ionomer based on the blend increased the tensile strength and ultimate elongation of the blend nearly 2 times. The blends of equal parts SBS and CSPE behaved as oil‐resistant thermoplastic elastomers. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 1975–1980, 2006     

基于身份密码体制的电子病历系统安全方案

针对目前电子病历系统存在病历信息泄露、数据被窜改、身份验证不严格等问题, 分析了该系统采用公钥基础设施（public key infrastructure, PKI）存在的不足, 提出了一种基于身份密码体制的改进方案。利用基于身份的加密、签名、认证等技术解决了电子病历系统中所遇到的一系列安全问题, 与已有PKI方案相比, 具有成本低、实现简单、效率高等优点。理论分析和实验结果表明, 该方案是保证电子病历系统安全运行的一种有效解决方案。     

发酵液的组成对纳滤分离谷氨酰胺的影响

研究了谷氨酰胺发酵液中盐离子对纳滤分离提取谷氨酰铵的作用，系统地考察了操作温度和发酵液组成对纳滤分离透过特性的影响，确定了纳滤分离时发酵液最佳稀释倍数和操作温度. 结果表明，二价阳离子通过改变膜面电荷密度对谷氨酸的透过特性产生很大影响，使其截留率降低了8%. 发酵液中较高浓度的(NH4)2SO4使谷氨酸和谷氨酰胺的截留率和透过通量明显降低，但较高浓度的NH4Cl影响较小，这体现了纳滤膜对不同离子排斥力的差异. 当发酵液稀释至谷氨酰胺浓度为1%，pH调至7时，发酵液中的其它盐离子和残糖因浓度较低而对纳滤分离影响不显著.     

掺和改性聚醋酸乙烯溶剂型建筑粘合剂的研究

通过在均聚醋酸乙烯树脂中加入胺类、聚醚类、聚氨醚类和环氧树脂等各种掺和剂进行改性,使其使用时间有不同程度地提高,而粘合强度不下降。     

液晶中间体环己酮衍生物合成及应用进展

环己酮衍生物在液晶显示材料中占有非常重要的地位。综述了近年来广泛应用的6种环己酮衍生物液晶中间体,即4-烷基环己酮,4-(反式-4-烷基环己基)环己酮,4-(4-烷基苯基)环己酮,4-[2-(反式-4-烷基环己基)乙基]环己酮,单乙二醇缩-1,4-环己二酮及单乙二醇缩-4,4’-双环己二酮,反式-6-烷基-2-十氢萘酮的合成方法及其在液晶合成中的应用进展。     

石英陶瓷注凝成型影响因素的研究

介绍了熔融石英陶瓷的注凝成型机理及其工艺过程,分析讨论了影响熔融石英陶瓷注凝成型的主要因素,通过研究确定了合理的制备工艺参数.     

浅议Excel电子表格应用中的常见问题

Excel2000电子表格作为日常的办公软件被广泛使用，对使用者来说，一学即会，但是在具体使用时，常常会遇一到些无法处理的问题，这就要求使用者加强对Excel2000电子表格全面系统的学习，才能极大地提高工作效率。     

烧碱蒸发装置的改进

通过改进工艺流程，科学确定加热面积的配比，合理选择采盐泵等技术改进措施，提高了生产强度，满足了高气压的生产条件，延长了洗效周期，减少了设备的腐蚀，提高了成品碱的质量，满足了生产联二脲的要求并降低了汽耗和电耗，年可节约ll0万元。