Moessbauer Investigation of the Ferromagnetic Coupling in Copper-Iron Polycyanides

One of the Prussian blue analogs, molecular magnet Cu3^Ⅲ [Fe^Ⅲ (CN)6]2.11.6H2 O, was investigated by Moessbauer spectroscopy. It was found that transition temperature was around Tc = 18.5 K from paramagnetic phase to ferromagnetic phase. The β value of the critical exponent is around 0.338 at magnetic ordering temperature.Therefore, the ferromagnetic coupling interaction of Cu-Fe cyanide could be clearly explained by spin wave theory.     

锥形光纤的偏振特性

随着光通信技术的不断发展，光纤的应用越来越广泛，而锥形光纤以其独特的传光方式越来越多地应用于光纤连接、成像及测量等领域。实验测定了不同锥角和不同长度锥形光纤的偏振特性。理论上，根据麦克斯韦方程组以及边界条件给出了光在理想光纤中的场分布，阐明了实际光纤中光的传输特性。论证了锥形光纤长度与其偏振特性的关系，进而利用几何光学方法对锥形光纤锥角与其偏振特性的关系作了定性说明。并用具体数据进行了定量计算，得出偏振光经锥形光纤传输或耦合后再传输到其终端所得到均是椭圆偏振光的结论。     

Hα Emission Imaging during Supersonic Molecular Beam Injection by CCD Photograph

There are several fuelling methods for tokamak plasma： pellet injection （PI）, gas puffing （GP）, neutral beam injection （NBI） and supersonic molecular beam injection （SMBI） .SMBI has been created in the Southwestern Institute of Physics, China.     

复合型铁氧体全极化器

应用耦合波理论 ,对有两组NS/N′S′四磁极磁化铁氧体中极化传输进行了分析 .在X、S波段对多种椭圆极化进行了测试 ,还完成了 0°～ 180°范围内多种线极化波测试 .最后对全极化器应用作了简单介绍 .     

由Cu^2＋中介的DNA双螺旋结构

大型干涉望远镜 (theverylargetelescopeinterferometer ,VLTI )是一台具有两个望远镜头的装置 ,它可以在任何方位角将光信号组合并获得较高的角分辨率 .最近VLTI拍摄到过去从未观察到的扁平星体Achernar.Achernar星是一颗离地球约有 14 5光年距离的恒星 ,它位于地球天空的南方 ,其质量是太阳质量的 6倍 .虽然VLTI不能提供这个星体的真实图像 ,但它却给出了Achernar星的精确的剖面图 .从图上可以看出Achernar星的赤道半径要比它的极地半径大 5 0 %,这在一般天体中是属于非常扁平状的球体 .如我们地球的赤道半径只比极地半径大 0 .3%.…     

非线性应变波耦合组的吸引子的正则性

本文研究了非线性应变波方程与Schr(?)dinger方程耦合系统Cauchy问题吸引 子的正则性.获得了该系统在空间Eo中存在整体吸引子Ao,并且Ao与E1中的强吸 引子A1相等.     

Coriolis耦合对Cl+H2→H+HCl非绝热反应的影响

使用含时波包方法 ,在Capecchi和Werner拟合的非绝热耦合势能面上 ,研究了Cl处在自旋轨道基态以及自旋轨道激发态时与H2 反应的活性 ,并且讨论了Coriolis耦合的影响 .计算了某些角动量时的反应几率 .计算结果显示 ,当Cl原子处在自旋轨道激发态与处在基态的H2 的反应活性很小 ,Coriolis耦合在这个反应中起了很小的作用 .     

A Mossbauer study of the magnetic coupling in iron phosphorous trisulfides

The polycrystalline sample of layered compound FePS_3 has been investigated by using M?ssbauer spectroscopy (12K to 300K), magnetic susceptibility measurements, x-ray diffraction and FTIR spectroscopy. The antiferromagnetic order exists below T_N=120.5±1K. The M?ssbauer spectra below T_N indicate that the magnetization axis is perpendicular to the layer of FePS_3, and the divalent iron cations are in their high spin configurations. By fitting the hyperfine field parameters near the Néel temperature, we obtain information on the nature of magnetic interactions in the material. The results show that the magnetic coupling can be treated by the two-dimensional Ising model, and it can be interpreted on the basis of a crystal-field effect.     

电感耦合等离子体发射光谱法同时测定涂料中的Pb、Cd、Cr和Hg

研究了电感耦合等离子体发射光谱法测定涂料中的重金属Pb，Cd，Cr和Hg，确定了测定涂料中的重金属Pb，Cd，Cr和Hg的最佳条件。加标回收试验和实际样品测定结果表明，方法的回收率和精密度分别在99.5％-110．0％和0．95％-1．98％范围，该方法快速、准确、可靠，各元素的检出限能满足涂料安全标准，适用于涂料的日常检验。     

Lambda Hypernuclei in a Chiral Hadronic Model

Nuclear matter calculations in a chiral hadronic model have been performed. It has been found that the scalar and the vector potentials and binding energies per nucleon in the chiral hadronic model are very close to those of the microscopic relativistic Brueckner-Hartree-Fock calculations. The good results for finite nuclei can be obtained in the mean field approximation only if scalar mass rns and coupling constant g8 have been improved with the fixed values of c^28 = g^28(M/rn8)^2 as those given by the original parameter sets of the chiral hadronic model. Then the chiral hadronic model is extended to lambda hypernuclei. Our results predicted by the chiral hadronic model are compared with those by the nonlinear Walecka model. It has been shown that the hadronic model can also be used to describe lambda hypernuclei successfully.