Elastic electron scattering with formamide-(H2O)n complexes (n=1, 2): Influence of microsolvation on the π* and σ* resonances

We report elastic cross sections for low-energy electron scattering with formamide-(H₂O)_n complexes (n=1, 2) in the energy region of 0.01-8 eV. The scattering calculations are performed using the R-matrix method in the static-exchange (SE) approximation. We consider three structures of formamide-H₂O and six structures of formamide-(H₂O)₂ in the present work. Our purpose is to investigate effects of water molecules hydrogen-bonding to formamide. We focus on the influence of microsolvation on the π^* and σ^* resonances of formamide. The scattering result for complexes shows that the position of π^* resonance appears at lower or higher energies in the cluster than in the isolated formamide depending on the complex structure and the water role in the hydrogen bonding. We explain this behavior according to the net charge of the solute. It is found that the microsolvation environment has a substantial effect on the width of π^* resonance. Our results indicate that surrounding water molecules may affect the lifetime of the resonances, and hence the process is driven by the anion state, such as the dissociative electron attachment.     

受L\''evy噪声扰动的Logistic方程的全局吸引性

本文考虑了受L\''evy噪声扰动的Logistic方程. 在合适的条件下, 我们得到了解的全局存在性与唯一性; 我们证明了当初始值小于环境的容纳量时, 唯一的正的平衡态具有全局吸引性.     

发光层的形态结构对电致发光器件性能影响的研究

详细研究了沉积在Poly(9-vinylcarbazole)(PVK)薄膜上的8－羟基喹啉铝（Alq3）薄膜的形态结构对电致发光器件ITO／PVK／Alq3/Mg-Ag性能的影响。研究结果表明：发光层（Alq3层）的表面形貌极大地影响发光层和金属阴极的接触面积,从而影响器件的电流－电压特性。发光层的表面越均匀连续,发光层和金属阴极的接触面积就越大,通过器件的电流就越大。在三种条件的器件中,基底温度为438K时制备的Alq3薄膜所对应的器件的量子效率最高,298K制备的器件的率效次之,77K制备的器件的效率最差。     

氮掺杂多孔炭材料的制备及在多相催化中的应用

氮掺杂多孔炭材料,不仅具有多孔炭材料的较高的比表面积、丰富的孔结构、良好的稳定性及耐高温耐酸碱性等优点,同时氮原子的引入使材料表现出优异的导电性能及电子传输能力,使得炭材料具有了一定的碱性及催化性能,是目前多相催化及材料领域的一个研究热点。本文综述了氮掺杂多孔炭的制备方法及在多相催化中的应用,并指出了该领域未来研发的重点及应用前景。