Chapter three introduces the nonequilibrium Green function method and its applications in mesoscopic transport, and the widely-employed Keldysh equation of motion with a current formula are induced.
第三章介绍了非平衡格林函数方法及其在介观输运中的应用，推导了广泛应用的运动方程以及电流公式。
By constructing principal function of a charged particle in electromagnetic field and using conservative system's Lagrange equation two formulas in Maxwell's equations are induced.
构造了带电粒子在电磁场中的作用量，借助于保守力系的拉格朗日方程，导出了麦克斯韦方程中的两个式子。
According to Terzaghi consolidation theory, the partial differential equation and filtration formula of the change diameter screw compression were induced.
根据太沙基固结理论推导出了变径螺旋压榨压方程，得出了压榨速率的表达式。
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