Nonlinear or linear algebraic systems appear as steady-state equations in continuous and discrete dynamical models (e.g., reaction-diffusion equations [14,19], neural networks [5,6,15,22] compartmental systems [2,4,11,12,16,17], population models [13,21]). Next we mention some typical models. Compartmental systems are used to model many processes in pharmacokinetics, metabolism, epidemiology an...

UNLABELLED To validate routine, noninvasive determination of absolute myocardial perfusion and coronary flow reserve (CFR), cardiac PET was performed in animals using a simplified imaging protocol, high-dose dipyridamole and a simplified quantitative algorithm specific for 82Rb and 13N-ammonia. METHODS One hundred thirty-five PET scans were obtained in eight dogs after intravenous 13N-ammonia...

There is a huge family of recurrent functions, which starts with equilibria and ends Poisson stable functions. They are fundamental in theoretical application senses, they admit famous history. Recently, we have added the unpredictable functions to family. The research has been performed several papers books. Obviously, merits increase if one provides rigorously approved efficient methods const...

A method is described for estimating the clearance rate and fractional blood flow of the fast (gray matter) compartment of the brain from the first ten minutes of 122 XE clearance curves, following a one-minute inhalation. Computer-simulated data were used to test the adequacy of the two-compartmental model employed, and to evaluate the stability of the parameters in the presence of random nois...