This thesis describes the application of a Monte Carlo radiative
transfer code to accretion disc winds in two types of systems
spanning 9 orders of magnitude in mass and size. In both cases, the
results provide important new insights. On small scales, the
presence of disc winds in accreting white dwarf binary systems has
long been inferred from the presence of ultraviolet absorption
lines. Here, the thesis shows that the same winds can also produce
optical emission lines and a recombination continuum. On large
scales, the thesis constructs a simple model of disc winds in
quasars that is capable of explaining both the observed absorption
and emission signatures - a crucial advance that supports a
disc-wind based unification scenario for quasars. Lastly, the
thesis also includes a theoretical investigation into the
equivalent width distribution of the emission lines in quasars,
which reveals a major challenge to all unification scenarios.
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