筋骨草甾酮C的谱学特征

筋骨草甾酮C是分布于植物中的植物甾酮类化合物,具有抗氧化的作用.本文标定了该化合物中所有的碳信号,并通过¹³C-¹H COSY和¹H-¹H COSY技术纠正了文献中氢信号归属的错误.     

血卟啉单甲醚对DNA损伤的拉曼光谱研究

利用激光拉曼光谱技术研究了新型光敏剂血卟啉单甲醚对ＤＮＡ（脱氧核糖核酸）分子的光动力学损伤。结果表明：ＤＮＡ分子由典型Ｂ型构型变成了一种修饰过的Ｂ型。连接碱基对的氢键被部分打断,碱基堆叠也有所与解。碱基本身也遭到了破坏,有脱氨基现象发生。腺嘌呤和胞嘧啶对血咔啉单甲醚的光动力学损伤更敏感。     

Measuring the optical parameters of thin films by p-polarized laser beams

The refractive index n_f, extinction coefficient k_f and thickness d_f of a dip coated film are measured by using p-polarized laser beams. A sample is oblique illuminated with a p-polarized laser beam, and then two reflected beams, from the front and back surfaces, are received with a detector. After measuring their intensity ratio versus the angle of incidence, it is convenient to obtain the parameters of the film by means of data fitting. The films of polymethyltriethoxy silane (PMTES), which were made on a BK-7 glass substrate by dip coating, were measured. The method is non-contact, non-destructive and has the advantages of simplicity of both equipment and understanding. It is also shown that the values measured by this method are coincident with those measured by ellipsometry.     

Effect of a rhombohedral phase on lithium intercalation capacity in graphite

Five natural graphites with different rhombohedral phase (3R phase) content have been investigated as anode materials for rechargeable lithium-ion batteries. The reversible capacity varies from 250 mA h/g to 350 mA h/g for the same intercalation conditions depending on the content of the 3R-phase. With increasing rhombohedral phase in the graphite, the intercalation capacity will be high. A peak at about 10 mV in the cyclic voltammograms (CV) of a sample with a large 3R-phase content is caused by lithium ions occupying boundaries between the rhombohedral (3R) phase and the hexagonal (2H) phase and is responsible for a capacity exceeding the theoretical value.     

关于树的补图的色多项式

本文证明了,由树的特征多项式可立即求出其补图的色多项式.     

高蛋白食物—螺旋藻

螺旋藻为原核生物。其所含蛋白质的质量和数量均为植物世界之冠;尚含各种维生素和生长因子;细胞壁易被人体消化;风味可口;无毒性。     

基于脉冲影响的向量双曲型方程的振动性

研究一类基于脉冲影响的向量双曲型偏微分方程的振动性,利用H-振动的概念及脉冲微分不等式,建立了该类方程在Dirichlet边值条件下所有解H-振动的若干充分条件,这里H是Rm中的单位向量.     

Propagation Characteristics of Surface Plasmon Polaritons Near Anisotropic 2D Materials Sandwiched by Chiral Media

A novel surface plasmonic waveguide structure composed of chiral medium and 2D material is proposed. The universal direction-dependent dispersion relation is obtained, which covers the combinations between 2D materials with in-plane isotropy or anisotropy and the surroundings with or without chirality. The tunability of the behavior of surface plasmon polaritons with the chirality of environment and the doping level are investigated. The averaging effect of chirality in both sides of 2D material is unveiled. Besides, the transverse spin of SPPs in the Chiral-2D material structure is explored and the asymmetric distribution of the transverse spin depends mainly on the contribution from the magnetic spin instead of the electric spin. These features are advantageous for the manufacture of novel photonic devices and the development of sensors techniques for the chiral environment.     

边界元素法中有关积分的计算方法(Ⅱ)柱状边界条件下对曲面积分及椭圆积分的计算

在柱状边界条件下将对柱侧面的曲面积分表示成一维积分，同时还给出了椭圆积分的计算方法，由对空间立体角积分的算例可知，其计算的速度有了显著的提高．     

Ⅱ—Ⅵ族稀磁半导体Cd1—xMnxTe／Cd1—yMnyTe超晶格的光调制反 …

本文报道用分子束外延技术生长的Ｃｄ１－ｘＭｎｘＴｅ／Ｃｄ１－ｙＭｎｙＴｅ超晶格样品在８０Ｋ下的光调制反射谱实验结果，观测到１１Ｈ，２２Ｈ，３３Ｈ和１１Ｌ等激子跃迁结构。计及晶格失配导致的应力效应，对子能级结构进行了理论计算。