Artículos con la etiqueta ‘modelo matemático’

A generalized statistical model for the size distribution of wealth

Por • 27 sep, 2012 • Category: Economía

In a recent paper in this journal [J. Stat. Mech. (2009) P02037] we proposed a new, physically motivated, distribution function for modeling individual incomes having its roots in the framework of the k-generalized statistical mechanics. The performance of the k-generalized distribution was checked against real data on personal income for the United States in 2003. In this paper we extend our previous model so as to be able to account for the distribution of wealth. Probabilistic functions and inequality measures of this generalized model for wealth distribution are obtained in closed form. In order to check the validity of the proposed model, we analyze the U.S. household wealth distributions from 1984 to 2009 and conclude an excellent agreement with the data that is superior to any other model already known in the literature.

Reinforcement-Driven Spread of Innovations and Fads

Por • 27 abr, 2011 • Category: sociologia

We propose kinetic models for the spread of permanent innovations and transient fads by the mechanism of social reinforcement. Each individual can be in one of M+1 states of awareness 0,1,2,…,M, with state M corresponding to adopting an innovation. An individual with awareness k1. The fraction of the population that remains clueless about a transient fad after it has come and gone changes discontinuously as a function of the fad abandonment rate lambda for M>1. The fad dies out completely in a time that varies non-monotonically with lambda.

Générer de la matière et de l’antimatière à partir du vide

Por • 18 feb, 2011 • Category: Ciencia y tecnología

Les scientifiques présentent ici un modèle théorique. Mais s’ils n’ont pas réalisé de dispositif expérimental concret qui permettrait de tester leurs idées, ce modèle, comme on le verra, pourraît être mis à l’épreuve dans des conditions accessibles.