广义逆理论中一个定理的拓广

给出了广义逆理论一个定理的推广,解决了体上相容矩阵方程AX=H解的最简表达式问题.     

金刚石格点上自避行走尾形链的构象统计理论

研究了金刚石格点上自避随机行走（ＳＡＷ）尾形链，采用精确计数和ＭｏｎｔｅＣａｒｌｏ模拟方法求得该ＳＡＷ尾形链的构象数Ｃ（Ｄ）１（Ｎ）和均方末端距［ｈ（Ｄ）１（Ｎ）］２及其分量随链长Ｎ的变化关系．发现它们与自由ＳＡＷ链一样都服从标度律，从这些量的计算机实验数据拟合求出了金刚石格点上ＳＡＷ尾形链的临界指数和格点指数．计算结果还表明短链ＳＡＷ在壁的法向与ＮＲＷ尾形链一样有所伸展，均方末端距的法向分量几乎是平行分量的２倍；但随Ｎ→∞，链自回避效应对壁的作用有所屏蔽．这些都与简立方格子模型上得到的结果一致．     

Synthesis and characterization of μ-oxamido copper(Ⅱ)-iron(Ⅱ) heterobinuclear complexes with an antiferromagnetic exchange interaction

Four new u-oxamido heterobinuclear complexes have been synthesized and identified as [Cu(oxap)Fe(L)2]SO4, where oxap denotes the N, N'-bis(2-aminopropyl)oxamido dianion and L represents diaminoethane (en); 1,3-diaminopropane (pn); 1,2-diaminopropane (ap) and 2,9-dimethyl-1,10-phenanthroline (Me2-phen). Based on the elemental analyses, spectroscopic studies, magnetic moments (at room temperature) and molar conductivity measurements, extended oxamido-bridged structures consisting of a copper(Ⅱ) and an iron(Ⅱ) ions, which have a square planar environment and an octahedral environment, respectively, are proposed for these complexes. Complexes [Cu(oxap)Fe(en)2]SO4 (1) and [Cu(oxap)Fe(pn)2]SO4 (2) have been characterized by variable temperature magnetic susceptibility (4.2~300 K) and the observed data were least-squares fitted to the susceptibility equation derived from the spin Hamiltonian including single-ion zero-field interaction for the iron(Ⅱ) ion, H=-2JS1.S2-DSzl2, giving the exchange integrals J=-2     

形态可控合成氧化亚铜粉体及其光催化性能

采用水热法成功可控合成了球形和立方氧化亚铜粉体.研究表明,在其它实验条件相同时,还原剂(酒石酸)和模板(明胶)的用量对产物的形态控制起到了关键的作用.当酒石酸使用量为0.005 mol时,将得到较规整的立方形Cu2O粉体,而在该体系中添加1.0 g明胶后,将获得球形的Cu2O粉体.两种形态的Cu2O粉体最大吸收波长均为500 nm左右(带隙约为2.2 eV).可见光催化实验结果表明,球形Cu2O粉体的光催化性能要优于立方Cu2O粉体.进一步分析研究得出,两者去除水中甲基橙染料的动力学模型均符合一阶动力学模型.     

Synthesis and Crystal Structure of Dicopper(II) Compound Containing Oxalate and Reduced Imino Nitroxide Radicals

1 INTRODUCTION There has been increasing interest in molecular- based magnetic materials, in which the combination of metal ions and organic radicals are used to construct assembled systems[1, 2]. Nitroxide radicals are normally used as spin carriers …     

用光辅助MOCVD制作巨磁阻薄膜PCMO

用光辅助MOCVD的方法成功地在LAO,Pt/Ti/SiO2/Si,Pt/LAO等不同的衬底上生长出巨磁阻材料PCMO,并且在室温无磁场的环境中观察到由脉冲电压诱导其电阻可逆变的效应(称为EPIR效应).实验证实,用此方法制备出的PCMO薄膜受到一定的脉冲电压驱动时,其电阻值可以增大,也可以减少,与所施加的脉冲极性有关,并且电阻值变化的大小与脉冲的数量有一定的关系,可以用多值的方式来记录和存储信息.这表明,用光辅助MOCVD制作的PCMO薄膜也具有可擦可写的,多值的存储信息的功能.可以被开发为高速读写,大容量的非易失性存储器,具有广阔的应用前景.     

一种新型有机聚合物射频移相器

设计了一种新型的有机聚合物射频(RF)移相器,这种移相器结构简单,容易集成,具有较好的相移效果.从性能曲线可以得出它能够从-90°～270°实现360°的连续相移.这种有机聚合物射频移相器可以在相控阵雷达系统和相控阵通讯中得到广泛应用.     

采样极谱法测定SOD模型化合物催化超氧离子歧化反应速率常数

用采样极谱法研究了非质子溶剂中SOD模型化合物催化O₂^-的歧化反应,用简化的函数关系代替动力学微分方程的准确解.通过测定极限催化电流与极限扩散电流比随SOD模型化学物浓度及滴汞电极滴下时间的变化,确定催化O₂^-歧化反应速率常数K₁.     

Spinor and Oscillator Representations of Quantum Enveloping Algebras of Type Bn,Cn and Dn

With the help of the q-deformed bosonic and fermionic oscillation operators, which can be conetructed from the ordinary ones, the quantum enveloping algebras of the classical Lie algebras B, C and D are written down explicitly. Under these representations the highest roots are given.     

Synthesis, characterization and magnetic properties of μ-iodanilato dinuclear oxovanadium (Ⅳ) complexes

Five oxovanadium(Ⅳ) dinuclear complexes described by the overall formula [(VO)2(IA)L2]-SO4, where IA represents the dianion of iodanilic acid and L denotes 2,2'-bipyridine (bpy) ; 4,4'-dimethyl-2,2'-bipyridine (Me2-bpy); 1,10-phenanthroline (phen); 4,7-diphenyl-1, 10-phenanthroline (Ph2-phen) and 5-nitro-l, 10-phenanthroline (NO2-phen) , have been synthesized and characterized by elemental analyses, molar conductivity and room-temperature magnetic moment measurements, IR and electronic spectral studies. It is proposed that these complexes have IA-bridged structures and consist of two oxovanadium(Ⅳ) ions each in a square- pyramidal environment. The complexes [ ( VO)2 (IA) (bpy )2 ] SO4 (1) and [ ( VO )2 ( IA) ( phen)2 ] -SO4 (2) were further characterized by variable temperature (4.2-300 K) magnetic susceptibility measurements and the observed data were fitted to the modified Bleaney-Bowers equation by the least-squares method, giving the exchange integral J = -2.15 cm-1 for 1 and J = - 9.88 cm-1 for 2