高层建筑TMD风振控制分析的复模态法

本文对带TMD的高层建筑风振响应问题进行了系统研究。首先建立了运动方程，然后用第一振型将主体结构展开，针对所得方程为非经典阻尼和非对称结构以及脉动风谱为非有理分式风谱的情况，用线性滤波过程生成脉动风谱，用复模态理论和扩阶法进行解耦，获得了等效风谱对应的以第一振型表示的结构风振响应的解析解。本文方法可用于带TMD结构的风振与抗风可靠度分析以及基于可靠度约束的抗风优化设计。     

不同纯度微细氧化铝粉联合生产的绿色新工艺

研究了用碳酸氢铵和铝盐联合生产微细氧化铝绿色生产的新工艺,提出了原则生产流程,对如何将原料进行内循环利用和回收作了描述,用等离子质谱和中子活化分析了氧化铝的纯度,用扫描电子显微镜对粒度进行了分析．     

In vitro metabolic N- and C-oxidation of phenanthridine

In order to compare an acceleromyograph (TOF-Guard) with a mechanomyograph (Grass FT03), the dose-response relationship of rocuronium was simultaneously determined in both arms of 15 children aged 3-11 years during anaesthesia with thiopentone, alfentanil and nitrous oxide. Three subgroups of five children received rocuronium 120, 180 or 240 micrograms.kg-1 randomly. The effective doses to produce 50% and 95% depression of the first twitch of the train-of-four determined by acceleromyography were 206 and 337 micrograms.kg-1, respectively, while these values determined by mechanomyography were 151 and 331 micrograms.kg-1, respectively. The dose-response curve obtained by acceleromyography was steeper and shifted to the right compared with that obtained by mechanomyography (p < 0.0001). The difference between the effective dose producing 50% twitch depression determined by the two devices was highly significant (p < 0.0001). In 13 out of 15 children, the acceleromyograph control train-of-four ratio was significantly greater than unity. Although there was a good correlation (r = 0.85) between simultaneous pairs of measurements of neuromuscular block, the acceleromyograph exhibited a bias of -25% relative to the mechanomyograph with wide limits of agreement (-62 to +12%). We conclude that acceleromyographic and mechanomyographic measurements should not be used interchangeably when determining the potency of muscle relaxants.     

CAN通信机理剖析及MCF52235FlexCAN底层驱动构件的开发

基于CAN(Control Area Network)硬件原理模型,深入剖析了CAN总线的仲裁、应答及报文过滤机制等通信机理,提出了CAN总线简化硬件电路设计。以此为基础,对Freescale MCF52235的FlexCAN模块底层驱动的封装方法进行了分析研究,根据嵌入式软件工程原则,给出了满足移植与复用要求的FlexCAN构件设计,为同类应用提高开发效率、增强系统稳定性提供了技术支持。通过应用实例给出了使用FlexCAN构件建立CAN通信网络的实现方法。     

Asymmetric polyurethane membrane with in situ‐generated nano‐TiO2 as wound dressing

For potential application as an ideal wound dressing, a novel asymmetric polyurethane membrane with in situ‐generated nano‐TiO₂ (PUNT) was successfully prepared via a combination of solvent evaporation, wet phase inversion, and organic–inorganic hybridization. According to this combination method, the PUNT membrane consisted of an integral and dense skin layer supported by a porous sublayer, with nano‐TiO₂ particles dispersed evenly throughout the sample. The skin layer was found to be impermeable to bacteria penetration, and the porous sublayer was designed for absorbing high amounts of exudates. Nitrogen adsorption/desorption experiment proved that extra mesopores were created in the PUNT membrane after organic–inorganic hybridization, which resulted in promoted gas permeability, water vapor transmission rate, and exudate absorption capability. The PUNT membrane, as a consequence, could accelerate gas exchange and also provide an optimal level of moisture over the wound beds without risking dehydration or exudate accumulation. Shake flask testing and cell culture (L929) assay indicated that the PUNT membrane exhibited antibacterial activity against Pseudomonas aeruginosa, Escherichia coli, and Staphylococcus aureus, whereas showed no cytotoxicity. From in vivo animal studies, the curative effect of PUNT membrane was found to be better than gauze and a commercial polyurethane membrane dressing. These results indicated that the PUNT membrane with multifunctions prepared in this study has potential for application as an ideal wound dressing. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

Fabrication of textured cerium-doped lutetium oxyorthosilicate ceramics by slip casting in a strong magnetic field

Cerium-doped lutetium oxyorthosilicate (Lu₂SiO₅:Ce, LSO:Ce) slurry with 35 vol.% solid content and viscosity of 70 mPa $·$s (at a shear rate of 4 s^–1) was prepared via a 24-h ball milling for the powder calcined at 1200°C and adding ammonium polyacrylate of 0.2 wt.%. Textured LSO:Ce ceramics were fabricated via slip casting in a vertical magnetic field and subsequently pressureless sintering of 1650°C and hot isostatic pressing. The maximum Lotgering factor f and relative density of the textured ceramics were 0.48% and 98.8%, respectively. Effects of grain size, dispersant, viscosity of slurry, and magnetic flux density on the grain orientation of LSO:Ce ceramics were systematically investigated. Based on the spatial state of grains, we proposed the rotation rule that LSO:Ce grains with or without space constraints in the slurry align along a and c-axis under the induction of a strong magnetic field.     

季铵盐对钴(Ⅱ)和锰(Ⅱ)的萃取分离

研究了用季铵盐从含氯化钠接近饱和的溶液中萃取分离二价金属离子钴、铁、锰的方法。实验结果表明 ,以含少量异辛醇改性剂的季铵氯化物的煤油溶液为萃取剂 ,萃取时尽管有 15 %～ 2 0 %的二价锰和钴一起被萃取 ,但通过两级洗涤可将负荷有机相中的锰降低到 0 .0 2 g/L以下 ,经三级洗涤除锰即可达到钴、锰分离。钴的回收率可达 98% ,负荷有机相中钴锰含量比大于 30 0。     

江苏广电城中央空调冷源系统方案分析

通过对江苏广电城中央空调系统的三套冷源方案进行分析和比较,表明在南京地区现行的能源政策下,采用蓄冰的空调系统在经济性方而具有很大优势,而采用吸收式空调系统的经济性较差.     

Dissolution of colemanite in (NH<Subscript>4</Subscript>)2SO<Subscript>4</Subscript> solutions

Turkey is the country having the richest boron ores in the world, and colemanite, tincal and ulexite are the ores being mined mostly in Turkey. These ores are used in the production of various boron compounds of which the production methods are generally patented. Colemanite ore also is reacted with sulfuric acid to product boric acid. Produced by this method, boric acid contains various impurities which reduce the market value and are difficult to remove. This study investigated the reaction between colemanite and ammonium sulfate as an alternative method to produce boric acid. Particle size, ammonium sulfate concentration, solid to liquid ratio and reaction temperature were chosen as parameters. In results, the conversion rate was increased by decreasing particle size and solid to liquid ratio, by increasing ammonium sulfate concentration and temperature. A semi-empirical model with 40.46 kJmol⁻¹ activation energy representing this process was found as follows: 1−(1−X)^1/3=2.12×10²·C^1.38·R^−0.75·(S/L)^−0.44·e^−4866/T·t^0.61.