看谱法测定铝合金的成分元素

研究了铝合金基体和合金中铝元素的看谱分析方法.对铝合金可见光谱线的激发方法及条件进行了试验探索.讨论了分析线和比较线的选取并摄制了相应的彩色图谱.结果可用于铝合金基体和合金中铝元素的定性和半定量看谱分析工作,能满足铝合金材料牌号鉴别的需求.     

A multidimensional subdiffusion model： An arbitrage-free market

<正>To capture the subdiffusive characteristics of financial markets,the subordinated process,directed by the inverse Q-stale subordinator S_α(t) for 0 <α< 1,has been employed as the model of asset prices.In this article,we introduce a multidimensional subdiffusion model that has a bond and K correlated stocks.The stock price process is a multidimensional subdiffusion process directed by the inverse Q-stable subordinator.This model describes the period of stagnation for each stock and the behavior of the dependency between multiple stocks.Moreover,we derive the multidimensional fractional backward Kolmogorov equation for the subordinated process using the Laplace transform technique.Finally, using a martingale approach,we prove that the multidimensional subdiffusion model is arbitrage-free,and also gives an arbitrage-free pricing rule for contingent claims associated with the martingale measure.