Application of coupled equation method on resonance processes of atomic lithium

The coupled equation method (CEM) has been applied to investigating the resonance structures for the ground state ls~22s~2S of the neutral lithium from the first threshold up to 64.5 eV.Resonance structures of atomic lithium due to single excitations of the ls and 2s electrons are studied by infinite-order calculations in detail.The effect of spin-orbit splitting is also included for some of the low-lying ls2snp(↑↓) resonance, and the influence of the interference between ls2s ~3Snp↓and ls2s ~1Snp↑states on the resonance structure has been confirmed theoretically.The results show that the presented technique can give the reasonable resonance structures very well in photoionization processes.     

聚乙二醇蓄热调温性能及其在功能纺织品上的应用

对聚乙二醇(PEG)的自身交联及其与纤维素纤雏之间的交联反应进行了研究，探讨了交联前后PEG热活性的变化，并对PEG在焙烘交联时的受热稳定性以及分子量对热活性的影响进行了讨论。研究表明，PEG发生交联反应后，热性能参教产生偏移，热活性降低；热活性与分子量有直接关系；过高的焙烘温度将导致PEG氧化降解，热活性下降。在适宜的工艺条件下，纺织品经PEG后整理可获得热活性。     

利用支撑向量机预报大气污染物浓度

针对污染物浓度序列具有强非线性和显著长程相关性的特点,结合相空间重构和支撑向量机(SVM)构建了一个多步预报的递归模型.对理想混沌序列和多种污染物浓度资料的实验结果表明,模型预报的准确率和效率均显著优于人工神经网络.这种通用建模方法的优势在于对系统非线性机制的反馈十分清晰,充分发挥了SVM适用于小样本问题、映射能力强、全局最优等特点,对非线性时间序列预报适用的其他领域同样具有启发意义.     

(CH3)2和(NH2)2基团修饰的齐聚苯乙炔分子电子输运性质研究

采用密度泛函理论和非平衡格林函数相结合的方法研究了S原子作为单、双端基的(CH₃)₂-OPE (齐聚苯乙炔)和(NH₂)₂-OPE分子在金电极间的电子输运性质. 通过第一性原理优化计算获得分子部分稳定结构, 再置于Au电极之间构成两极系统, 然后再优化整个两极系统获得稳定结构. 另外, 通过非平衡格林函数方法计算了两极系统的电子输运性质. 计算结果表明, 不同的修饰基团和桥接方式可以导致两极系统的开关效应、负微分电阻行为和整流行为等不同的电子输运性质. 通过计算不同偏压下的分子体系投影轨道电子分布、透射谱、态密度, 对这些新异的电输运性质出现的机理进行了解释.     

边界振动的微腔中薛定谔猫态的产生

采用全量子理论,考虑了边界振动的微腔(振动边界视作频率为ωm的量子谐振子)与单模辐射场构成的系统,在薛定谔绘景中,给出了系统的时间演化算符,得到了系统的态函数随时间的演化关系.结果表明,当振动边界回到初态时的腔场态能给出许多与已有文献不同的薛定谔猫态,且通过调整单模辐射场的频率可以选择想要的薛定谔猫态.     

The Application of Microwave Low Temperature Plasma in Pretreatment of Cotton Fabric

The effect of microwave low temperature plasma pretreatment on desizing and removing natural impurity of cellulose fiber was studied. The influencing factors of pretreatment such as treating power, gas pressures and time were discussed in detail and the final effect had been compared with that of traditional pretreating process of cotton fabric. The results showed that better capillary effect, strength, whiteness and dyeing K/S value could be given by means of microwave low temperature plasma treatment.     

Photo-detachment cross section of H- near two parallel interfaces

The photo-detachment cross section of H^- near two parallel elastic interfaces is derived and calculated by using the closed orbit theory. The photo-detachment cross section of H^- near two interfaces is shown to exhibit multi-periodic oscillations when the distance between the H^- and the interface is varied. Each peak in the Fourier transformed photo-detachment cross section corresponds to the length of a closed orbit, which is quite similar to the case of atomic spontaneous emissions in a dielectric slab. This study provides a new understanding of the photo=detachment process of H^- in the presence of interfaces.     

一种实现LED光源均匀照明的透镜设计

为解决大功率LED难以直接应用于照明的问题,设计了一款适用单芯片大功率LED的透镜,可在特定照明面上实现均匀照明。根据朗伯型光源辐射特性,采用折射和反射结构,先进行理论计算设计自由曲面面型,再利用Tracepro的交互式优化功能实现对透镜优化。优化得到的透镜经过软件模拟验证,在距离光源200 mm处直径为100 mm的目标照明面内照度均匀性优于87%;不考虑光能损失,光能利用率高于94%。     

微波等离子体引发合成P(AMPS/NIPA)新型智能凝胶及其性能

以2-丙烯酰胺-2-甲基丙磺@（AMPS）和异丙基丙烯酰胺（NIPA）为单体,通过微波等离子体引发聚合制备了新型二元智能凝胶P（AMPS／NIPA）,并对其性能进行了研究。探讨了等离子体功率及处理时间对聚合反应的影响;研究了该凝胶的温度敏感性、吸水／失水动力学和pH敏感性及其影响因素;对凝胶的组成及三维交联网络结构进行了表征。结果表明,P（AMPS／NIPA）二元智能凝胶具有高的溶胀比、很好的温度敏感性和pH敏感性以及快的智能响应速率。