芳香酮与芳香醛及芳香胺的Mannich反应

醛、酮与芳香醛及芳香胺的 Mannich 反应,文献[1]曾报道在 HCl-EtOH 溶液中苯乙酮及甲醛与芳香胺的 Mannich 反应。本文在此基     

分形子-电子相互作用导致的电阻率

利用推广的Hnsch-Mahan量子输运方程,求解了分形子-电子相互作用系统的电阻率.克服了电阻率的低温发散困难,给出了电阻率反常处的温度.     

苯乙酮、对甲氧基苯甲醛和芳香胺的Mannich反应

苯乙酮与对甲氧基苯甲醛和芳香胺在少量浓盐酸或HCl-EtOH溶液催化下直接进行Mannich反应,用一步法合成了6个相应的Mannich碱,其中有3个是新的有机化合物,产率高达60%～73%.本文还对Mannich碱生成的条件进行了讨论.     

芳香胺参加的Mannich反应(Ⅸ)——二苯甲酰甲烷与芳香胺的Mannich反应

二苯甲酰甲烷与37％甲醛水溶液和芳香胺在HCl-C_2H_5OH溶液存在下可直接发生Man-nich反应,得到1-芳氨基-2,2-二苯甲酰乙烷.共合成6个新化合物.产率较高.本文对Mannich碱生成的条件进行了讨论.     

MAGNON EXCITATION OF QUASI-ONE-DIMENSIONAL ORGANIC FERROMAGNET

A new quasi-one-dimensional organic ferromagnet model is proposed. Magnon excitations for finite and infinite on-site repulsion of electrons on main carbon chain are investigated. It is found that the lowest branch of spectrum preserves the characteristics of the ferromagnetic magnon. It is also shown that with increasing of the on-site repulsion energy, the itinerant π-electrons become tightly localized.     

First-principles study on the electronic structure and optical properties of T12Cd2（SO4）3 and Rb2Cd2（SO4）3

With the help of ab initio full-potential linearized augmented plane wave （FPLAPW） method, calculating the electronic structure and linear optical properties is carried out for XCd2（SO4）3 （X =Tl, Rb）. The results show that Tl2Cd2（SO4）3 （TlCdS） has a larger band gap than Rb2Cd2（SO4）3 （RbCdS） and the energy bands for RbCdS are more dispersive than those of TlCdS. From their partial densities of states （PDOS）, we have observed that the hybridization between S ionic 2p and O atomic 2p orbitals forms SO4 ionic groups. The remarkable difference between RbCdS and TlCdS is, however, the degree of hybridization between cation （Tl and Rb） and its surrounding oxygen atoms. In the view of quantum chemistry, the strong p-d hybridization indicates the existence of their cation ionic bonds （Cd-O, Rb-O, and Tl-O）. The calculations of TlCdS and RbCdS show their optical properties to be less anisotropic. Their anisotropies in the optical properties mainly occur in a low photon energy region of 5-16 eV.     

猪血丙种球蛋白的制备工艺研究

报道了运用低温乙醇与明矾吸附、碳吸附相结合，制备猪血丙种球蛋白的工艺，纯度可达９５％以上，回收率达５７％，其他各项指标均达卫生部制定的《中国生物制品规程》标准。     

无序超导的动力学理论

基于分形振子(fracton)-电子相互作用,提出了一个无序超导的动力学理论;证明了无序超导体中的电子通过交换虚分形振子可能产生一个有效的吸引作用,它使得具有相反波矢和自旋的电子组成库珀对,从而导致超导。本理论从动力学观点导出了渗流超导的临界温度。 关键词：     

New Infrared Properties of the Tetragonal CaTiO3

First-principle calculations are performed to study the infrared optical and electronic properties of the tetragonal CaTiO3. We find that dielectric function and reflectivity exhibit a new single-peak infrared spectrum. It is shown that strong orbital hybridization can form the dipole distribution of covalent bonds (Ti-O1 and Ti-O2)and can result in anomalous optical behaviour. The tetragonal structure that determines the dipole configuration and leads to the optical dipole-dipole transition forbidden is therefore realized to be vital to cause such optical phenomena with the insulator feature.