  In this paper, the interaction and transmission time of quantum density
solitons waves representing particles passing through finite barrier potentials
is investigated. Using the conservation of energy and of quantum density, it is
first demonstrated that these waves have finite de Broglie wavelength and
represent particles in quantum theory. The passage of the quantum density
solitons (particles) through barriers of finite energies is then shown to lead
to the phenomena of resonant tunneling and, in Josephson-like configurations,
to the quantization of magnetic flux. A precise general measure for barrier
tunneling time is derived which is found to give a new interpretation of the
quantum indeterminacy principles.
