Non-equilibrium Green's function 6 Quantum chemistry 6 Different mechanisms 4 Green's function 4 Heat transfer 4 Impurities 4 Nanomechanical device 4 Nanomechanical systems 4 Non-equilibrium Green's function formalism 4 Non-equilibrium green functions 4 Probes 4 Quantum oscillators 4 Theoretical development 4 Time dependent 4 Voltage probes 4 Wire 4 Ac voltage 2 Analytical expressions 2 Analytical results 2 Combined effect 2 Conductance oscillations 2 Coupling constants 2 DC voltage 2 Dc current 2 Differential equations 2 Electric potential 2 Fcm2006 2 Fcm2008 2 Four point resistance 2 Four-terminal resistance 2