UASB-SBR工艺处理啤酒废水

阐述了UASB-SBR组合工艺处理啤酒废水的工艺流程,实践表明,UASB-SBR系统具有运行稳定、费用低、抗冲击负荷强等优点。     

A high propylene productivity over B2O3/SiO2@honeycomb cordierite catalyst for oxidative dehydrogenation of propane

Boron-based metal-free catalysts for oxidative dehydrogenation of propane (ODHP) have drawn great attention in both academia and industry due to their impressive activity and olefin selectivity. Herein, the SiO₂ and B₂O₃ sequentially coated honeycomb cordierite catalyst is designed by a two-step wash-coat method with different B₂O₃ loadings (0.1%-10%) and calcination temperatures (600, 700, 800 ℃). SiO₂ obtained by TEOS hydrolysis acts as a media layer to bridge the cordierite substrate and boron oxide via abundant Si-OH groups. The welldeveloped straight channels of honeycomb cordierite make it possible to carry out the reactor under high gas hourly space velocity (GHSV) and the thin wash-coated B₂O₃ layer can effectively facilitate the pore diffusion on the catalyst. The prepared B₂O₃/SiO₂@HC monolithic catalyst exhibits good catalytic performance at low boron oxide loading and achieves excellent propylene selectivity (86.0%), olefin selectivity (97.6%, propylene and ethylene) and negligible CO₂ (0.1%) at 16.9% propane conversion under high GHSV of 345,600 ml·(g B₂O₃)^-1·h^-1, leading to a high propylene space time yield of 15.7 g C₃H₆·(g B₂O₃)^-1·h^-1 by suppressing the overoxidation. The obtained results strongly indicate that the boron-based monolithic catalyst can be properly fabricated to warrant the high activity and high throughput with its high gas/surface ratio and straight channels.     

The First Study of SCR of NO x by Acetylene in Excess Oxygen

Acetylene as a reducing agent for the selective catalytic reduction (C₂H₂-SCR) of NO in the presence of excess oxygen on various Ce-exchanged zeolites was investigated for the first time. Under the conditions of 1600 ppm NO, 800 ppm C₂H₂, and 9.95 % O₂ in He, the Ce-H-ZSM-5 (Si/Al=25) catalyst shows about 83% NO conversion to N₂ at the temperatures ranged from 300 to 350 °C. It is followed by the other zeolites in the activity order of Ce-H-Y (Si/Al=2.5), Ce-H-_ (Si/A1=20∼30), and Ce-H-SAPO (Si/Al=34), Ce-H-5A (Si/Al=12). Almost no NO conversion was obtained over Ce-Na-ZSM-5 (Si/Al=25) and Na-ZSM-5 (Si/Al=25) catalyst samples. The Conversion of NO to N₂ increased with O₂ concentration in the range of 0.1 ∼ 9.95% over the CeH-ZSM-5 (Si/Al=25) catalyst. It is suggested that O₂ plays an important role in the C₂H₂-SCR of NO reaction, by oxidizing NO to NO₂ on acid sites in assistant with cerium species of the catalyst. A large amount of CO, which seems to be in proportion with the NO conversion to N₂, was produced. Long-term experiments up to 56 h combined with a excursion of the reaction temperature up to 650 °C over the Ce-H-ZSM-5 (Si/A1=25) confirmed the catalyst’s durable performance under the reaction conditions. It is found that the de-NO_x activity of Ce-H-ZSM-5 catalyst can be enhanced by the presence of 50 ppm of sulfur dioxide in the dry-feed reaction conditions.     

硅烷／聚硅氧烷化学改性双酚A型环氧树脂研究

提出了一种有机硅改性电子封装用双酚A型环氧树脂新方法——用二氯二甲基硅烷(DMS)或其与。α，ω-二氯聚二甲基硅氧烷(DPS)的混合物来改性双酚A型环氧树脂；测定了固化物的冲击强度、拉伸强度、断裂伸长率、玻璃化转变温度等；用扫描电子显微镜观察了改性材料的断面形态。结果表明，环氧树脂经5．7份DMS或0．7份DMS、10份DPS改性后，均达到了很好的增韧和提高耐热性等效果，符合电子封装材料改性要求；后者的增韧效果更为显著，其断面SEM照片呈现特殊的褶皱状微团结构。     

Characterization of end‐functionalized styrene–butadiene–styrene copolymers and their application in modified asphalt

End amino, carboxylic acid, and hydroxyl functionalized styrene–butadiene–styrene (SBS) triblock copolymers were prepared with 1,5‐diazabicyclo[3.1.0]hexane, carbon dioxide, and epoxy ethane as capping agents, respectively. The effects of the end polar groups on the morphology and dynamic mechanical properties were investigated. Transmission electron microscopy images suggested that the group at the end of the polystyrene (PS) segment made the morphology of the PS domains disordered and incompact. Dynamic mechanical results showed that the storage and loss modulus increased after SBS was end‐functionalized. End amino and carboxylic acid groups improved the compatibility and storage stability of SBS‐modified asphalt. However, the effect of the end‐hydroxyl group on the improvement of the storage stability of SBS‐modified asphalt was not obvious. The differential scanning calorimetry analysis of SBS‐modified asphalt further showed that the compatibility and storage stability of SBS‐modified asphalt were improved by the attachment of amino or carboxylic acid groups through the anionic polymerization method. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 8–16, 2007     

Memory E?cient Two-Pass 3D FFT Algorithm for Intelr Xeon PhiTM Coprocessor

Equipped with 512-bit wide SIMD instructions and large numbers of computing cores, the emerging x86-based Intelr Many Integrated Core (MIC) Architecture provides not only high floating-point performanc...     

CaCO3/natural rubber latex nanometer composite and its properties

Calcium carbonate/natural rubber (NR) latex nanometer composites were prepared by adding nanometer CaCO₃ whose surface had been treated to natural rubber latex (NRL) before sulfuration. The physical, thermooxidative aging, and thermal degradation properties and the ultra‐microstructure were analyzed with a multipurpose material testing meter, a thermal analysis meter and a Philips XL‐30 SEM, respectively. The results showed that the structures and properties of nanometer composites could be clearly improved by NRL mixed with surface‐treated nanometer CaCO₃. The physical properties of the nanometer composites were best when the content of surface treatment agent was 2.5% (to nanometer CaCO₃), the nanometer CaCO₃/NRL content was 3:100, and the stirring time for treating the surface of the nanometer CaCO₃ was 20 min. Simultaneously, the thermooxidative aging resistance of the nanometer composites also was significantly improved. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 3442–3447, 2006     

鲁棒性项目调度中缓冲设置方法

研究应对不确定因素的鲁棒性项目调度, 针对其所用时间缓冲区技术中的两种重要方法——集中缓冲和STC (starting time criticality) 分散缓冲, 采用仿真模拟实验, 以项目管理库中的帕特森例1 为对象, 进行详细的比较研究. 研究结果表明, 分散缓冲法具有更好的解鲁棒性; 当活动时间的不确定性程度较大时, 集中缓冲法的质量鲁棒性较好; 当项目工期较紧时, 分散缓冲法具有更好的鲁棒性. 这些研究结论为管理者在特定的项目环境下选择合适的缓冲方法提供了决策依据.     

冷却器盘管失效分析及防范措施

本文介绍了冷却器盘管破裂泄漏的情况，分析了失效破坏的原因，并提出防止冷却器盘管破裂泄漏的措施。     

生物复合杀虫剂——亲态保对几种重要鳞翅目害虫杀虫活性的研究

通过室内浸叶法和田间药效实验,分别测定了亲态保混剂1号和2号对斜纹夜蛾、二化螟、小菜蛾、三化螟、稻纵卷叶螟等重要鳞翅目害虫的杀虫活性。室内测定共毒系数的结果表明,亲态保1号比单一制剂对斜纹夜蛾、二化螟、小菜蛾有明显的增效作用;田间药效试验结果表明,亲态保防效均高于单一制剂,其中亲态保2号和1号每亩160g剂量对3代三化螟和稻纵卷叶螟的防治效果分别为88.1%和87.1%,防效均在85%以上,高于单一制剂的药效,有较好的推广应用价值。