The synthesis and characterisation of polyaniline catalysed and doped by squaric acid

Aniline was polymerized in dilute aqueous squaric acid and the polyaniline (PAn) was doped with 10⁻¹–10⁻³ mol/L of squaric acid. The corresponding electrical conductivity of the PAn is 10⁻¹–10⁻² S ⊙ cm⁻¹. The solubility of the doped PAn has been improved in common polar organic solvents. The FTIR and UV—Vis spectra show that the PAn has the structure of both quinone and imine. Supported by the National Natural Sciences Foundation of China Zhan Caimao: born in 1948, Associate professor     

机场停机位实时分配研究

航班提前、延误和取消的情况发生的频率逐年增加,给机场运营指挥中心的调度计划造成了很大的干扰。建立了应对机场非正常运行的停机位实时分配模型,目标是对原停机位分配方案干扰最小。模型的计算结果不仅包含飞机停机位实时分配方案,还包括飞机的降落时间。在建立模型后,使用CPLEX优化软件对模型进行求解,数据采用某枢纽机场的实际航班数据,验证了模型的有效性。最后进一步研究了解决停机位使用次数和使用时间的均衡化问题,更加贴近实际情况。     

Green Light-Emitting Region-Regular Poly（9,9-Dihexylfluorene-co-Fluorenone） Prepared from Solvent-Free Oxidative Coupling Polymerization

Soluble green light-emitting poly（9,9-dihexylfluorene- co-fluorenone） was synthesized by solvent-free oxidative coupling polymerization of 9,9-dihexylfluorene in a facile one-step reaction. The polymers were characterized by FT-IR, ^1H NMR, ^13C NMR, UV-Vis and fluorescence spectroscopy. The region-regular structure of the polymer linking at 2, 7＇-position on the fluorene moieties was obtained. The FT-IR spectra of the polymers showed fluorenone vibration. The fluorescence spectra of the solid thin film of the polymers displayed green light-emitting, which was emitted from fluorenone moieties produced in the polymerization process.