低频涡流电磁场非自伴变分问题的研究

利用伴随算子和伴随场函数,建立了低频涡流电磁场中非自伴算子问题的一般变分描述.还分别应用最小作用原理和拉格朗日乘子法(广义变分原理)建立了低频涡流电磁场中非自伴算子问题的变分描述.将这3种变分方法与迦辽金法进行了比较.结果显示,上述所有方法均可获得与迦辽金法完全一致的结果.最后讨论了拉格朗日乘子的意义及其与伴随场函数的关系.     

The diversity of denitrifying bacteria in the alpine meadow soil of Sanjiangyuan natural reserve in Tibet Plateau

Denitrification is a dissimilatory biological process of denitrifying bacteria where oxidized nitrogen com- pounds (NO3? and NO2?) are used as alternative electron acceptors and fixed nitrogen is transferred into the at- mosphere in form of N2, finally. I…