BACKGROUND Stewart (1947) and Clark (1951) proposed that urban population density is a negative exponential function of the distance from a city’s center. This model of the spatial distribution of ...

Essentially, apodization has the ability to improve the sensitivity (S/N ratio) or the resolution in the spectrum and to even eliminate truncation artifacts following data collection. This function is ...

Journal of Biogeography, Vol. 30, No. 6 (Jun., 2003), pp. 827-835 (9 pages) Aim This paper reviews possible candidate models that may be used in theoretical modelling and empirical studies of ...