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The COVID19 pandemic is generating an international effort to know the main dynamic aspects that this new epidemic crisis is causing, which is why a large number of initiatives are emerging around the world in relation to the development of mathematical models. The present work develops a dynamic simulation model based on the Systems Dynamics technique, under a systemic vision approach of the social and health problems it raises. The results have been simulated with respect to the casuistry of the Community of Madrid. The tremendous problem posed by the group of undetected infected, the cause of the spread of the epidemic, as well as the evidence of the technical difficulty posed by the lack of reliability of official data, for this reason, is evident. [ABSTRACT FROM AUTHOR]

This article provides an estimation of the future demand of construction materials in Colombia and necessary minerals to produce them by using systems dynamic and analysis of materials flows. Through the analysis of materials flows the amount of minerals required for the production of cement and concrete are determined. Required production of cement and concrete is estimated through a model of systems dynamic, which is adjusted with data from DANE construction census. Results indicate that, disregarding the secondary offer of materials, 176.9 million tons of ground aggregates, river sand, gray cement, dead rock, and cooked ceramic would be required. Manufacture of cement and concrete would require 15.4 million tons of lime, 14.9 million tons of gravel, 14.1 million tons of gypsum, and 13.3, 9.7, and 9.3 million tons of clay, iron minerals, and sand, respectively. [ABSTRACT FROM AUTHOR]