低温超韧聚苯乙烯的配方研究

以高抗冲聚苯乙烯(HIPS)为基体树脂,采用双螺杆挤出机研究了不同抗冲击改性剂类苯乙烯弹性体、丙烯腈-丁二烯-苯乙烯共聚物(ABS)高胶粉、聚烯烃弹性体(POE)、丁苯弹性体、苯乙烯-丁二烯-苯乙烯弹性体(SBS)和苯乙烯-乙烯／丁二烯-苯乙烯共聚物(SEBS)对HIPS的增韧效果。结果表明,SBS和SEBS对HIPS具有最好的增韧效果,当SBS含量达到40.0份时,能使HIPS体系的常温简支梁缺口冲击强度达到42.1kJ／m~2,-40℃低温冲击强度可达25.3kJ／m~2,具有优异的低温韧性和优良的综合性能。     

用除尘灰分离炭粉制备活性炭及其改性研究

以除尘灰分离炭粉为原料，确定了制备颗粒活性炭的最佳工艺，并对制备的颗粒活性炭进行不同的改性处理和对不同有机蒸气的吸附实验。利用X—光电子能谱仪分析了改性处理后的表面化学性质。吸附实验证明，活性炭的比表面积、表面化学性质和有机物的性质对吸附过程产生影响。     

基于CDIO理念的《软件工程》课程建设研究

为实现面向能力的人才培养,在CDIO工程教育理论的指导下,从《软件工程》的工程性特点着手,讨论如何全面实施CDIO人才培养理念,以CDIO能力培养大纲为依据,以CDIO的人才培养模式指导课程建设,建立理论与实践相结合,多维度、立体化的《软件工程》课程内容体系,为培养具有国际竞争力的软件工程师奠定坚实基础。     

Interactions between Cytochrome c and DNA Strands Self-Assembled at Gold Electrode

In this work, we reported the investigation on the interaction between DNA strands self-assembled at gold electrodes and an electron transfer protein, cytochrome c. We observed that cytochrome c exhibited well-defined electrochemistry in both double-stranded and single-stranded DNA films. This suggested that the electron transfer reaction of cytochrome c arose possibly due to the electron hopping along DNA strands rather than wiring along the double helix. We also compared the heterogeneous electron transfer rate of cytochrome c with that of a ruthenium complex, which further confirmed this mechanism.     

合成Co_2O_3—Cr_2O_3—Fe_2O_3—MnO_2系高温黑颜料最佳工艺条件的探讨

本文介绍了Co_2O_3—Cr_2O_3—Fe_2O_3—MnO_2系高温黑颜料的合成工艺,研究分析了四种氧化物的不同配比、混合及合成温度等工艺过程对颜料呈色的影响,从而确定了含钴量较低呈色纯正的Co—Cr—Fe—Mn系高温颜料的最佳工艺条件,并利用过渡金属络合物的吸收光谱理论对Co、Cr、Fe、Mn四种元素的变价离子使含Ba釉着黑色的特性作出了定性的分析.     

高强度聚乙烯纤维绳索的制备研究

研究了纤维的捻度及浸胶处理对超高相对分子质量聚乙烯 (UHMWPE)纤维力学性能及摩擦磨损性能的影响。结果表明 ,UHMWPE纤维的断裂强力随着纤维捻度的增加而减小 ,纤维浸胶处理后的断裂强力增大 ;当UHMWPE纤维中改性氯丁胶粘剂或聚氨酯胶粘剂的含量为 6%时 ,其断裂强力分别增加 17.2 %或 13 .9% ,聚氨酯胶粘剂处理过的UHMWPE纤维的耐摩擦磨损性能最好。     

Interaction of methane with surfaces of silica,aluminas and HZSM-5 zeolite. A comparative FT-IR study

Infrared investigations on the interaction of methane with silica, aluminas (, and ) and HZSM-5 zeolite have been carried out. At low temperature (173 K), methane adsorption was observed over these oxides and HZSM-5 zeolite. Our findings featured that the infrared inactive ₁ band (2917 cm^–1) of a gaseous methane molecule became active and shifted to lower frequencies (2900 and 2890 cm^–1) when it adsorbed on the surfaces of these adsorbents. Our results also demonstrate that hydroxyl groups played a very important role in methane adsorption over the acidic oxides and the HZSM-5 zeolite. When interaction between the hydroxyl groups and methane took place, the band shift of the hydroxyl groups varied with different oxides. The strength of the interaction decreased according to the following sequence, Si-OH-Al>Al-OH>Si-OH, which is in accordance with the order of their acidities. At higher temperatures, methane interacted quite differently with various oxides and HZSM-5 zeolite. It has been observed that the hydroxyl groups of silica, -alumina and HZSM-5 zeolite could exchange with CD₄ at temperatures higher than 773K, while those on -alumina could exchange at a temperature as low as 573 K. Another interesting observation was the formation of formate species over Al₂O₃ (both and ) at temperatures higher than 473 K. The formate species would decompose to CO₂, or produce carbonate at much higher temperatures. Formation of formate species was not observed over silica and HZSM-5 under similar conditions, -Al₂O₃ did not adsorb or react with methane in any case.     

基于Maven的J2EE后台管理系统代码生成器

后台管理系统功能和模式相对固定,为了降低软件开发人员的重复工作量,缩短项目的开发周期,应用基于模板技术的代码生成原理,设计一款基于Maven的后台管理系统代码生成器,完成从业务模型到后台管理系统的代码生成;从业务文件定义、业务文件解析到模板合成阐述本代码生成器的内部结构。     

活性端基聚氨酯橡胶改性不饱和聚酯树脂的研究(Ⅱ)

通过在不饱和聚酯树脂中加入活性端基聚氨酯橡胶来降低树脂的体积收缩.树脂固化前,橡胶与不饱和聚酯树脂相溶性好;树脂固化时橡胶中的不饱和双键反应可参与反应,并呈一定粒径的胶粒析出.本文研究了几种活性端基聚氨酯橡胶对不饱和聚酯树脂收缩控制的影响.