Neutron Relativistic Phenomenological and Microscopic Optical Potentials

The experimental data of the neutron total cross section σ_t,nonelastic cross section σ_non and elastic scattering angular distribution σ_el(θ) for ten target nuclei ranging from ¹²C to ²³⁸U with incident energies E_n=20—1000MeV were used to optimize the relativistic phenomenological optical potential (RPOP) through automatic search of the best parameters by computer.In addition,a relativistic microscopic optical potential (RMOP) based on Walecka model were also used to analyze the same data and compare with the RPOP.
Through comparison between these two kinds of relativistic optical potential hints in improving both the RMOP and RPOP is indicated.     

The Effect of the Neutron Skin and the Neutron Distribution Diffusion on Nuclear Potential

The interaction potentials between two heavy ions are calculated by using the energy density formalism and the nuclear Fermi density distributions,the factor of the neutron skin and the surface diffusion of the neutron distribution increasing with the increases of the neutron excess is considered.In this calculation,the experimental fusion barriers are well reproduced,and improved for the intermediate heavier nuclear systems.It is found that the neutron skin and the neutron distribution diffusion can explain the influence of the neutron excess degree of freedom on the proximity scaling.     

Ward-Takahashi Identity at Finite Temperature

A new real time formalism, based on the closed-time-path Green's function theory (CTPGF),is employed to obtain Ward-llfrkahashi identities of QED at finite temperature. It is shown that WT identity in coordinate space is of the same covariant form aa that in vacuum field theory. A perturbative check is provided to #how that in momentum spze, Takahashi's iden tities hold only in a weak sense.     

Pseudospin Wave State in One-Dimensional Half-Filled Hubbard Model

All the eigenfunctione with spin S = (M - 1)/2 of one-dimeneional half-filled Hubbard model are obtained by ueing a eimple method (M is the number of the sites). These eigenfunctions depend on U, t, and the momentum k. It ie shown that the eigenetates we obtained can describe varioue kinde of pseudospin waves with wave vector k and these pseudoepin wave etates are accompanied with a charge transferring. This is in agreement with the exact diagonalisation results for emall eitee ring.     

若干"大乌型"Schiff碱配合物合成和性质的研究

由4-叔丁基2,6-二甲酰基苯酚与4-正己基-3-氨基硫脲缩合, 合成了"大乌"配体(H3BB), 它与Cu(II)、Ni(II)、Co(II)、Pb(II)、Cd(II)生成五种电中性的可溶性"大乌"配合物, 除Co(II)配合物外, 其余四种均为乙氧基桥联的双核配合物, 配体是将4-叔丁基2,6-二羟甲基苯酚用MnO2在室温下直接氧化, 得到4-叔丁基-2,6-二甲酰基苯酚, 然后再与4-正己基-3-硫代氨基脲缩合而得, 该反应步骤较少, 产量较高, 优于前人结果。用IR、UV等方法对配合物进行了表征, 并用Evans的核磁共振法研究了吡啶与Ni2BB(OEt)在轴向的作用和配合物两中心原子间的作用。这五种配合物中, 有趣的是Ni2BB(OEt)呈顺磁性, 本文对其原因作了探讨。     

稀土氯化物催化的Diels-Alder反应

本文提出以稀土氯化物作催化剂, 催化等摩尔比的丙烯醛和乙烯基丁醚进行环加成反应, 生成α-丁氧基-3,4-二氢-2H-吡喃, 实验表明, 环加成产物是不稳定的中间物, 它可以进一步开环聚合构成一个催化的连串反应, 找到了稳定中间物的反应条件, 以90-95%产率得到环加成产物。     

苯甲酸在水-乙醇混合物溶剂中的电离焓

本文测定了苯甲酸在水-乙醇混合溶剂中的电离焓, 并就此进行了讨论。     

镧系三氟化物的SCF-Xα-SW研究

对10个镧系元素(Ln)三氟化物进行了非相对论和相对论SCF-Xα-SW计算, 通过能级、轨道、结合能及布居数对比, 讨论化学键本质: 共价键中4f轨道的作用及相对论效应,结果表明, LnF3中Ln原子轨道参与成键的次序是: 轻稀土d>f>p>s, 而重稀土则有f>d>p>s。相对效应使Ln4f能级上移, 扩大了与F2p能级的距离, 减弱成键。原子序数增大, Ln4f能级下移, F2p能级距离缩小, 使重稀土氟化物中成键增强, 结合能计算值与实验值定性趋势一致, 重稀土氟化物电离能的计算表明, 相对论方案是获得定量符合所应该采用的。     

过渡金属络合物猝灭单重态氧能力的研究

研究了多种不同过渡金属络合物对单重态氧的猝灭问题。结果表明过渡金属络合物猝灭单重态氧的能力主要和络合物分子的几何构型有关。能形成平面四方形结构的络合物由于中心金属原子易于和¹O₂分子相接近因而具有强的猝灭¹O₂的能力,反之形成四面体形结构的络合物则猝灭能力减弱。     

2-氨基取代噻唑基膦酸脂的合成

本文报导一系列2-氨基-5-取代-4-噻唑基膦酸酯和2-氨基-4-取代-5-噻唑基膦酸酯的合成. 这类化合物显示了一定的杀菌活性.