Short-Time Dynamical Behaviour of Depinning Transition in the Uniformly Frustrated Two-Dimensional XY Model

A short-time dynamic scaling approach is extended to study the depinning transition of the two-dimensional frustrated XY model driven by external currents. We investigate the scaling behaviour of depinning transition in the XY model with three different flux densities f = 1/2, 1/25, 1/30. The short-time scaling behaviour in the depinning transition of the two-dimensional XY model is clearly shown up. Besides the critical current, the exponent θ is obtained.     

紫外可见分光光度法测定铜及铜合金抛光液中的硝酸根

研究了紫外可见分光光度计在301.7 nm处测定铜及铜合金抛光液中硝酸根的浓度.方法的线性范围为0.9662-9.6621 g/L,适合于该类型抛光液中硝酸根的检测.该方法快速简便、准确度高、精密度好.     

强非局域非线性介质中的超高斯空间光孤子族

运用变分法,对任意实对称响应函数泰勒级数展开取至二阶,得到了1 1维强非局域非线性介质中光束传输的超高斯光束的近似分析解,提出了超高斯空间光孤子族模型。分析结果表明:束宽解是三角函数型,相移、空间啁啾以及临界输入功率都正比于超高斯光束的阶数,束宽振荡周期不仅与介质材料有关,而且还与光束和相位因子的阶有关。提出了准方波形空间光孤子的可能性。     

重铬酸钾法测定全铁含量的实验改进

针对重铬酸钾滴定法测定全铁含量实验中的不足之处进行了改进，探索出一种基于SnCl₂-I₂-AgCl预处理的无汞测铁方法，改进后的实验涉及四大化学平衡理论知识，方法具有更好的重现性、环境友好、成本低，取得了良好的教学效果。