CFD在燃煤细粒子凝聚过程中的应用

燃煤产生的细粒子富集了大量的有毒痕量元素,对大气环境和人类健康造成严重危害。本文针对燃煤细粒子的形成过程,在计算流体力学(CFD)的基础上,结合气溶胶动力学理论,模拟了烟气中细粒子在圆柱形流场中由于碰撞而凝聚的过程,并通过计算结果分析细粒子颗粒特征参量(速度、质量、直径和颗粒数目)随流场的变化趋势,为深入研究燃煤细粒子的形成演化机理提供理论基础。     

温室气体减排与微藻生物能源的集成

微藻生物能源具有巨大的开发潜力及应用前景,但仍面临很多产业化瓶颈.本文分析了微藻生物能源技术的潜力与存在的问题,指出制约微藻生物能源技术发展的主要障碍为规模养殖,如何提高微藻生长效率、降低能耗、提高规模生产的可靠性仍是面临的艰巨任务.本文介绍了石油化工企业温室气体减排与微藻生物能源技术的集成及技术思路,构建了减排工业废气与生产微藻生物能源的循环经济模式.此外,还介绍了中国石化在利用温室气体发展微藻生物能源技术方面的实践,围绕能源微藻选育技术、光生物反应器技术、微藻生物质加工及综合利用技术展开阐述.     

四针状纳米氧化锌的热力学函数

采用简单、温和的微乳液水热辅助法合成了尺寸、形貌均匀的四针状ZnO纳米结构,每个结构由四根长约250nm的纳米针组成．基于块体ZnO的热力学函数已知,依据热力学势函数法设计热化学循环,将纳米ZnO与块体ZnO的热力学函数进行了关联．并结合热动力学理论及过渡态理论,利用微量热技术获得了所制备的四针状纳米ZnO在298．15K下的标准摩尔生成焓、标准摩尔生成Gibbs自由能、标准摩尔熵值分别为（-329．37±0．43）kJmol-1,（-318．51±0．03）kJmol-1,（20．36±1．05）Jmol-1 K-1．     

华中地区偏远站点金沙站气态污染物的变化特征

对于2006年6月到2007年7月在华中地区的金沙区域大气本底站站址科学论证实验期间获得的近地面O₃、SO₂、NO_x和CO等观测资料进行分析, 讨论其浓度水平、变化特征和影响因素. 结果表明, 观测期间O₃、SO₂、NO_x和CO的平均浓度分别为24.6±17.0 ppb、2.8±5.5 ppb、5.6±5.5 ppb和502±222 ppb, 低于同纬度位于长三角地区的临安大气本底站的同期观测水平. 金沙站局地O₃光化学生成不显著, 一次污染物的平均日变化比较平稳, 有别于临安和位于华北地区的上甸子大气本底站的变化特征. 由于观测点相对孤立且海拔相对较高, 可受到自由大气的影响, 使O₃浓度持续多日保持较高水平, 而一次污染物浓度很低, 相对湿度显著降低且与O₃浓度变化明显反相关. 因此, 该站数据可以在更大的尺度上反映出区域本底信号的变化情况.     

Determination of 18 phenolic acids in tobacco and rhizosphere soil by ultra high performance liquid chromatography combined with triple quadrupole mass spectrometry

An ultra high performance liquid chromatography with triple quadrupole mass spectrometry method for the determination of free and bound phenolic acids in tobacco plant and soil was developed. A simple solid‐phase extraction, which used Polar Enhanced Polymer column as stationary phase and methanol as mobile phase, was used for the clean‐up of bound phenolic acids, and a liquid‐phase extraction using chloroform as solvent was used to purify free phenolic acids. With our method, 18 phenolic acids in rhizosphere soil of continuous cropping flue‐cured cultivar k326 were separated and determined within 6 min with recoveries of 82–107% and relative standard deviations (n = 5) of 1.1–4.8%. Results showed that free phenolic acids accounted for 0–9, 92–100, and 69–100% of total phenolic acids in rhizosphere soil, cultivar k326 roots and leaves, respectively. Results also revealed that p‐hydroxybenzoic acid, p‐coumaric acid, vanillic acid, ferulic acid, and syringic acid were the predominant phenolic acids in rhizosphere soil of cultivar k326, and continuous cropping of cultivar k326 in the same farmland could lead to the accumulation of these phenolic acids in soil except syringic acid. The determination of phenolic acids provided detailed information for evaluating their source and characteristics in continuous cropping tobacco plant and soil.     

HLS bunch current measurement system

Bunch current is an important parameter for studying the injection fill-pattern in the storage ring and the instability threshold of the bunch, and the bunch current monitor also is an indispensable tool for the top-up injection. A bunch current measurement (BCM) system has been developed to meet the needs of the upgrade project of Hefei Light Source (HLS). This paper presents the layout of the BCM system. The system based on a high-speed digital oscilloscope can be used to measure the bunch current and synchronous phase shift. To obtain the absolute value of bunch-by-bunch current, the calibration coefficient is measured and analyzed. Error analysis shows that the RMS of bunch current is less than 0.01 mA when bunch current is about 5 mA, which can meet project requirement.

     

4-芳基-6-芳氧甲基吗啉-3-酮衍生物的合成及其对A549肺癌细胞生长抑止活性的评价

A series of 4-aryl-6-aryloxymethylmorpholin-3-one derivatives were synthesized very efficiently from readily available starting compounds in two steps. Ring opening reactions of epoxides with aniline compounds on alumina gave corresponding β-aminoalcohols （3）. The resulting β-aminoalcohols were reacted with 2-chloroacetyl chloride to yield the desired 4-aryl-6-aryloxymethylmorpholin-3-one derivatives （5）. All compounds 5 were assayed for inhibitory activity against A549 lung cancer cell growth, and the inhibitory effect of the novel morpholin-3-ones on cell viability was dose-dependent.