Numerical Renormalization Group studies of Quantum Impurity Models in the Strong Coupling Limit

In this thesis we summarize a number of theoretical studies dealing
with various properties of quantum dots. Small quantum dots with a
large level spacing are very well described by the Anderson
impurity model. In modern quantum dot experiments all parameters of
this model can be tuned via external gate voltages. Thus, it should
be possible to check our theoretical findings experimentally. We
are particularly interested in temperatures $T$ smaller than the
so-called Kondo temperature $T_K$, $T