钢筋腐蚀监测的光波导传感方法原理探索

本文提出了一种用于混凝土结构钢筋腐蚀监测的光波导传感方法,该方法利用金属膜层局部取代光波导的介质包层,构成腐蚀敏感膜,从而获取金属腐蚀信息.本文依据波导理论讨论了该方法的原理,利用电化学方法在721比色皿的石英玻璃上证实了平面光波导腐蚀传感方案的可行性,并进一步用电镀方法制备出了光纤腐蚀传感器(FOCS)实验样品,取得了预期实验结果.     

二维各向同性谐振子的双波描述

二维各同性谐振子体系除哈密顿量外还有三个独立的守恒量。本文给出了对这些不同描术宾比较。     

具有色散补偿及增益平衡的光纤链中准孤子传输

用变分法研究非线性薛定谔方程, 讨论了在有色散补偿及增益平衡的光纤链中双曲正割（ｓｅｃｈ）型和高斯型准孤子的传输条件及特性。并给出了最优化设计的判据。根据判据作了数值模拟, 结果说明近似计算对系统设计有现实意义     

准孤子对间作用及对传输容量和距离的制约

通过对光纤级联系统中一对准了的传输进行理论分析和数值模拟,研究了准孤子间相互作用及其对系统传输容量和距离的制约,并首次分析了对传输的精细过程。     

细长,薄壁锥管成形模设计

介绍了一种缩口、胀形复合成形模,成形模具设计时充分考虑了成形的可能性和加工过程的经济性.     

乡镇企业的二次创业与资本运营

本文简述了乡镇企业发展历程,分析了其面临的挑战和机遇,阐述了资本运营在乡镇企业再创辉煌中的作用.     

基于焦平面技术的红外地球姿态敏感方法研究

红外地平仪是很多空间飞行器平台姿态控制系统的关键姿态敏感设备,红外地球姿态敏感方法是其核心工作原理。针对传统红外地平仪基于光机扫描技术的红外地球姿态敏感方法,存在检测数据量小、姿态测量精度低的缺点,提出基于焦平面技术地球姿态敏感方法,阐述其算法原理和工作波段选择。由于大视场光学系统的引入,分析了光学系统的成像方式引起的姿态测量误差。实验表明提出的基于焦平面技术地球姿态敏感方法具备较高精度的姿态测量功能。     

Observing the stereodynamics of chemical reactions using randomly oriented molecular beams

A new method is demonstrated to study the stereodynamics of simple chemical reactions that does not require the use of oriented (or aligned) molecular beams or measurements of the orientation state of product molecules. Instead, it is shown that by numerically combining accurate measurements of the state-to-state differential cross section for two or more rotational states of the reagent molecule, the separate contribution from the individual helicity states can be extracted. New molecular beam experiments are conducted for the D+H(2)-->HD+H reaction that confirm the validity of the method.     

In-capillary solid-phase extraction-capillary electrophoresis for the determination of chlorophenols in water

A novel CE method combined with SPE in a single capillary was developed for analysis of chlorophenols in water. A frit of 0.5 mm was first made by a sol-gel method, followed by packing a SPE sorbent in the inlet end of the capillary. Two phenol derivatives, 2,4-dichlorophenol and 2,4,5-trichlorophenol, were used as the model compounds. By loading sample solutions into the capillary, the two chlorophenols were extracted into the sorbent. They were desorbed by injecting only about 4 nL of methanol. Finally, the analytes were separated by conventional CE. The technique provided a concentration enhancement factor of over 4000-fold for both chlorophenols. The detection limits (S/N = 3) of 2,4-dichlorophenol and 2,4,5-trichlorophenol were determined to be 0.1 ng/mL and 0.07 ng/mL, respectively. For replicate analyses of 5 ng/mL of 2,4-dichlorophenol, within-day and between-day RSDs of migration time, peak height and peak area were in the range of 1.8-2.0%, 4.0-4.4% and 4.1-4.6%, respectively. The method shows wide linear range, acceptable reproducibility and excellent sensitivity, and it was applied to the analyses of spiked river water samples. The capillary packed with the SPE sorbents can be used for more than 400 runs without performance deterioration.     

透水混凝土铺装基层三种骨料对典型径流污染物吸附效果比较

为提高透水混凝土铺装基层对雨水径流污染物的削减作用,通过优选骨料的方法对透水混凝土铺装基层进行功能强化研究,采用静态吸附等温试验对三种骨料开展了试验。研究表明,采用沸石骨料对雨水径流污染物削减效果最好,沸石对径流主要污染物COD、TP、TN、Cu的理论饱和吸附量分别为8.612、1.848、3.932、7.032mg/g。沸石和陶粒相较于砾石对径流污染物COD、TP、Cu的吸附能力分别提高了51%和14%、61%和34%、87%和58%,沸石对于TN的吸附远高于陶粒和砾石,所以,对骨料进行优选后可以提高基层的除污能力,为透水混凝土铺装的扩大应用提供创新方法,同时为海绵城市的建设提供技术支持。