In Paper 446 on the AIAS web site, theoretical considerations have been made to realize counter gravitation and harvest energy from spacetime itself. The momentum of the electromagnetic field is used to counteract gravitation. The result is similar to the force an electron experiences in a capacitor volume which is the basis for the well known Millikan experiment.
Secondly, a resonance mechanism of the harmonic oscillator is described, where the electromagnetic vector potential is used to create mechanical resonance so that energy from the vacuum or spacetime can be transferred. For a net win of energy, it must be ensured that there is no backward dependency from the oscillator, while the vector potential is utilized or created. One possibility is to use the vector potential of permanent magnets, which is “refilled” automatically by quantum processes, if this field is doing external work.