On the quark structure of nonstrange hadrons

An effective algorithm is presented for calculations of matrix elements of physical processes in the framework of the virton-quark model that represents a kind of the relativistic quantum bag. This model has only two free parameters and allows to describe the low-energy processes of hadron physics from unique point of view. These parameters are defined by fitting basic experimental quantities: the decay widths of pseudoscalar, scalar and vector mesons, the strong meson-nucleon interaction constant, the decay width of Δ isobar. Theoretical predictions are in good agreement with the experimental data