推求等效组态的原子谱项波函数

本文提出了推求复杂组态Ｌ－Ｓ耦合谱项波函数的系统方法，着重解决了推求多重谱项的谱项波函数这一难题，运用ＰＡＳＣＡＬ语言编制了计算程序，利用本程序可快速、准确地求出等效组态的ｓ＾Ｎ，ｐ＾Ｎ，ｄ＾Ｎ，ｇ＾Ｎ，ｉ＾Ｎ，ｋ＾Ｎ的Ｌ－Ｓ耦合谱项和谱项波函数     

几种有机电子转移型光谱烧孔材料的均匀线宽与温度的依赖关系

本文通过在不同温度下对金属卟琳系列光子选通光谱烧孔材料的测试,研究了部分有机电子转移型烧孔材料的均匀线宽随温度变化的关系,在30K到70K温度范围内得到了Γ_hom∝T^1.29±0.05的结果.     

Pressure broadened calculations of the OCSJ = 1 → 2 line by non-polar perturbers

Microwave spectral line widths of the transitionJ = 1 → 2 of OCS perturbed by non-polar perturbers,n-hexane, cyclohexane,n-heptane, carbon disulphide, carbon tetrachloride and benzene have been calculated using a recent theory of Mehrotra and Boggs.     

On the widths ofK levels of heavy elements

The ratios of the widths ofK levels of heavy elements with atomic number 70 to 92 have been calculated with relativistic wave functions, retardation, screening and field theoretical corrections to relativistic energy. The calculated values have been compared with the available observed data and good agreement has been obtained.     

高压下高温超导材料YBa2Cu3O7的电子结构

 本文选用拟合能带的Harrison参数构造紧束缚哈密顿矩阵，采取Recursion方法计算了YBa₂Cu₃O₇晶体在常压下与9 GPa高压下（此时晶格常数压缩3%）的电子结构。讨论了高压对于电子结构的影响。给出了高压下费米面移动，能带展宽和各晶位原子价变化的定量结果。     

A numerical study on the unsteady evolution of weak axisymmetric fountain flows in a homogeneous ambient

Weak axisymmetrical fountains resulting from the injection of a dense fluid upwards into a large container of homogeneous fluid of lower density has been studied numerically in this paper using a time-accurate finite volume scheme. The behaviour of fountains for both the uniform and parabolic profiles of the discharge velocity at the fountain source has been investigated. The evolution of transient fountain flow has been analysed and two distinct stages of evolution have been identified. The time trace of the position of the fountain front has been presented and the initial, temporary and final fountain height and fountain width have been determined. The project is jointly supported by the National Natural Science Foundation of China, the Special Fund for the Young and Middle-aged Academic and Technical Leaders Training Scheme of Yunnan Province, and the Australian Development Cooperation Scholarship to Prof. Lin Wenxian. Author for correspondence: Li Yuncang.     

Optimize design super collimation in square lattice two-dimensional photonic crystals

The plane wave expansion (PWE) method was used to get the three-dimensional band diagram and equifrequency surface (EFS). From the EFS the maximum flatness half width (MFHW) and its position were got. The relation between MFHW and filling fraction P_f, dielectric ratio ε_b/ε_a were given in order to get the optimal structure we employ in this paper. Then the maximum super collimation was given by beam propagation method (BPM).     

γγ interactions with KLOE

Studies of γγ interactions are performed with the KLOE detector, without tagging of the outgoing e^＋e^-. The data sample is from an integrated luminosity of 240 pb^-1. It was collected at the φ-factory DAONE with e^＋e^- beams colliding at √s ≌1 GeV, below the φ resonance peak. We present preliminary results concerning the observation of the γγ→η process and the evidence for γγ→π^0π^0 production at low π^0π^0 invariant masses.     

Strengthening of RC beams with an innovative timber-FRP composite system

The results of a theoretical and experimental research project on the use of an innovative technique for strengthening concrete beams are presented. A spacer element is inserted between the tension side of a beam and the composite material to increase its lever arm and to enhance the over all stiffness of the strengthened beam. The main aim of this exploratory project was to increase the ultimate failure load of strengthened beam specimens, whilst guaranteeing acceptable over all deflections at the serviceability limit states. This resulted into a significant reduction in the amount of FPR required and in a better utilization of the materials employed. A preliminary theoretical study was carried out to investigate the effect of Young’s modulus, failure strain, and thickness of the element to be used as a spacer in order to determine the best possible candidate material. Three tests on 2.5-m-long beams were carried out, and different anchorage techniques were used to try and prevent the debonding of the strengthening system. The results from this pilot study are very promising, as the strengthening system ensures an adequate initial stiffness along with an improved ultimate flexural capacity. Russian translation published in Mekhanika Kompozitnykh Materialov, Vol. 44, No. 3, pp. 403–416, May–June, 2008.     

An efficient approximate numerical method for modeling contact of materials with distributed inhomogeneities

This research explores the influence of distributed non-interpenetrating inhomogeneities on the contact of inhomogeneous materials via a new efficient numerical model based on Eshelby’s Equivalent Inclusion Method. The half-space contact of a sphere with an inhomogeneous material is considered, and the solutions take into account interactions between all inhomogeneities. The efficiency and solution accuracy of the proposed method are demonstrated through comparative studies with those of an existing numerical method and the finite element method. The influence of spatial inhomogeneity orientations on the contact elastic field is investigated and parametric studies are conducted for the effect of arbitrarily distributed inhomogeneities on the stress field of the materials. The significance of the influences of inhomogeneity distribution parameters on the inverse volumetric stress integral is quantified and the corresponding data are fitted into selected several formulas as a step towards understanding the rolling contact fatigue life of the materials.