The periodic table which helps to determines the classification of elements.

An immediate observation for those who deal with the processing of signals is the omnipresence of the concepts of frequency, which are called “spectra” here. This presence is important in the fields of theoretical research as well as in most appl

An investigation of the effects of disorder on the modes of vibration of nearly periodic structures is presented. It is shown that, in structures with close eigenvalues, small structural irregularities result in both strong localization of the mode

x and y are the numbers of individuals, respectively of prey and predator populations or suitable (but equivalent) measures of density or biomass. The parameters present in system (1) are the intrinsic growth rate r, the carrying capacity K, the