abstract the purpose of this paper is to investigate the factors affecting adoption of agricultural crops insurance among apple growers in semirom and eghlid shahrestans and determining the best model. a survey was conducted using the stratified random sampling. data were collected by questionnaire from 240 adopters and 157 non – adopters. the results showed that adopters of insurance are more ...

fitzhugh-nagumo (fhn) model is a famous reaction-diffusion system which first introduced for the conduction of electrical impulses along a nerve fiber. this model is also considered as an abstract model for pattern formation. here, we have used the cellular automata method to simulate the pattern formation of the fhn model. it is shown that the pattern of this model is very similar to those of ...

in this paper we investigate the effects of broadband infrastructure providing high speed internet, on economic growth in developing countries. we have used two different broadband measures to classify developing countries into two groups for the period 1999-2008. by using logistic diffusion model and iv approach, a nonlinear diffusion model is specified. differences in ceiling of diffusion cur...

a study was carried out to map dispersal of trichogramma brassicae bezd. on tomato in a 0.5 ha field. first, 1, 5, 10, 15, 20 and 25 meter distances from the central point of the field were marked in form of squares. on each square, 8 points were selected and a wooden stake of 1.5 m length was vertically secured into the soil at each point equal to plant height and bearing a yellow sticky trap ...

In this paper we study the topology effects on diffusion process in signed networks. Considering a simple threshold model for diffusion process, it is extended to signed networks and some appropriate definitions are proposed. This model is a basic model that could be extended and applied in analyzing dynamics of many real phenomena such as opinion forming or innovation diffusion in social netwo...

the cellular automata method has been used to simulate the pattern formation of the schlögl model as a bistable reaction-diffusion system. both microscopic and macroscopic cellular automata approaches have been considered and two different methods for obtaining the probabilities in the microscopic approach have been mentioned. the results show the tendency of the system towards the more stable ...