双环戊二烯-马来酸酐共聚物的合成、表征及其与聚氨酯反应性共混研究

合成了双环戊二烯-马来酸酐交替共聚物(DCPD-co-MA),产率约25%。采用红外、核磁共振氢谱和碳谱对共聚物进行了表征,差热分析和热重分析表明该共聚物具有较好的热性能,其T_g为210℃,起始热失重温度为310℃。采用反应性共混方法合成了DCPD-co-MA与聚氨酯(PU)的共混物(PU/DCPD-co MA),反应温度为80℃。该共混物具有较好的综合性能,其起始热失重温度较纯PU提高了约41℃,共混后,其耐热性能有较大改善。     

Low cost surface passivation for p-type mc-Si based on pseudobinary alloys (Al2O3)x(TiO2)1−x

The conventional process for back side passivation with full face Al screen printing layer is not suitable for very thin multicrystalline (mc-Si) solar cells and approaches to new technological processes are searched for. More investigations have been concentrated on local aluminum contacts and passivation coatings with different layers on mc-Si wafers. The aim of this work is to prove that (Al₂O₃)_x(TiO₂)_1−x is one promising candidate to be applied as passivation layer on multicrystalline Si. Investigations were performed on dielectric films of pseudobinary alloy (PBA) (Al₂O₃)_x(TiO₂)_1−x, prepared by chemical solution deposition known initially as sol–gel method. It was determined that their optical, dielectric and electrophysical properties are suitable for applications of these layers as back side surface passivation for thin multicrystalline silicon cells.     

晶粒超细化方法在降低材料表面能过程中的作用

利用分子动力学的原理计算了几种超细金属晶粒的表面能。研究表明:在超细化的晶粒尺寸范围内,材料表面能随晶粒尺寸的进一步减小急剧降低,而当晶粒长大到约20 nm后,材料的表面能则很快升至一个稳定的极限值——宏观尺寸材料的表面能值。对材料表面进行晶粒的超细化处理可使材料具有极低的表面能特性,这一特性可以应用于高黏度流体的减阻输送等领域。     

Shape optimization of inclined ribs as heat transfer augmentation device

This work presents numerical optimization techniques for the design of a rectangular channel with inclined ribs toenhance turbulent heat transfer.The response surface method with Reynolds-averaged Navier-Stokes analysis isused for optimization.Shear stress transport turbulence model is used as a turbulence closure.Computational re-sults for local heat transfer rate show a reasonable agreement with the experimental data.Width-to-rib height ratioand attack angle of the rib are chosen as design variables.The objective function is defined as a linear combina-tion of heat-transfer and friction-loss related terms with the weighting factor.Full-factorial experimental designmethod is used to determine the data points.Optimum shapes of the channel have been obtained in a range of theweighting factor.     

0801 Ni 催化剂上 CO 甲烷化反应机理研究

本文使用 TPD 和 TPR 方法对 CO 在载体镍催化剂上的吸附和脱附性质,以及进行甲烷化反应进行了研究.指出了在0801Ni 催化剂上 CO 甲烷化反应可能遵循的机理,并用数学优化方法求出了反应进行的活化能,进一步验证了所提机理的合理性.     

一种新型组环式热水锅炉

设计了一种新型组环式热水锅炉独特的烟道结构，分析其基本技术特性，表明热水锅炉的换热面积小，换热效率高。为降低成本和缩小炉体体积提供了技术条件。     

轴类高硬度表面磨削烧伤与检查方法

高硬度轴类在磨削过程中,常有磨削表面烧伤甚者磨削裂纹的出现,使轴表面层的应力呈现复杂状态。磨削缺陷的产生,与磨削工艺参数控制不当、材料表层组织缺陷、以及轴类弯曲畸变等因素密切相关,仅就磨削表面烧伤的产生与检查方法进行探讨。     

酞菁铜衍生物LB膜／N－Si光伏电池的反常二极管整流效应

从表面态和材料电阻率的角度分析了酞菁铜衍生物ＬＢ膜光伏电池的反常整流效应，讨论了该效应与光生电流的关系，并介绍了消除反常现象提高光生电流的实验方法。     

SOI亚微米波导光栅的设计与制作

报道了SOI基亚微米小尺寸波导光栅器件的设计、制作与测试结果。提出了波导与光栅同步制作的方案,避免了套刻,节约了成本。实验中采用电子束光刻(EBL)、感应耦合等离子体(ICP)刻蚀等先进半导体工艺技术,结合图形补偿等技术手段,完成了亚微米波导光栅的制作。光栅周期为350nm,占空比16∶19。采用该光栅做反射镜,制作了法布里-珀罗(F-P)谐振腔,经测试得到了与模拟相吻合的结果,峰谷比达到11dB。     

微流控拉曼检测芯片的制备与应用

微流控芯片系统具有高效率、低损耗、高安全系数、高灵敏度等优势,表面增强拉曼散射(SERS)光谱具有灵敏度高以及指纹效应强等优点。从两方面对微流控拉曼检测芯片进行综述:微流控芯片通道和SERS基底的制备以及微流控拉曼检测芯片的集成与应用。最后讨论了SERS微流控芯片在便携化应用方面的挑战和机遇,并对整个领域的未来发展方向与前景进行了展望。