Nowadays mathematical models play a major role in epidemiology since they can help predicting the spreading and evolution of diseases. Many them are based on ODEs assumption that populations being studied homogenous sets fixed points (individuals) but actually far from people constantly moving. In fact, thanks to science progresses, distances no longer what used be past disease travel reach out...

Fractal modifications of Fick?s laws are discussed by taking into account the electrode?s porous structure, and a fractal derivative model for diffusion-reaction process in thin film an amperometric enzymatic reaction is established. Particular attention paid to giving intuitive grasp its variational principle solution procedure. Extremely fast or extremely slow diffusion can be achieved suitab...