In this thesis, after expanding the fields of displacement and stress with the scalar potential functions frequently used in the acoustics theory, we have extended the previous multiple-scattering theory through changing tensor operator into scalar operator, which is called the multiple-scattering theory of scalar potential function expansion.
本文引用声学理论中标量势函数展开声子晶体中的位移场和应力场,在前人多重散射理论的基础上,化张量运算为标量运算,形成了所谓的标量势函数展开的多重散射理论法。
Taking yield advantage index as quantitative index, the author analyzed the changes on absolute of domestic and presidial advantage of yield of the main crops in Huaiyin during 19952000.
以产量优势指数为比较优势计量指标,分析了江苏省淮安市淮阴区主要的8种农作物在1995~2000年间产量在国内和省内绝对优劣势的变动情况,发现除个别作物的产量绝对优劣势随着时间的推进在个别时期会发生较大的变化外,多数作物的产量绝对优劣势基本保持相对稳定。
