  The temperature dependence of electron spin polarization for a narrow quantum
Hall system shows behavior analogous to that of a two-dimensional system at
major filling factors. At the lowest half-filled quantum Hall state for which
no two-dimensional analog exists, we find a stable spin partially-polarized
system. Periodic Gaussian repulsive impurities (antidots) in such a system
leads to novel spin transitions at $\nu=\frac13$ and $\nu=\frac12$ and the
pair-correlation functions provide clues about nature of different ground
states in the system. These results can be explored in optical spectroscopy and
optically pumped NMR Knight shift measurements.
