The current COVID-19 pandemic has affected thousands of people around de world, regardless their race, religion, sexual preferences nor socioeconomic class, leaving all us with the same vulnerability to suffer this disease. This emergency situation shown have ability collapse health care systems in countries like: Italy, Spain, and United States, because medical personnel available material res...

We address a novel approach for stochastic individual-based modelling of single species population. Individuals are distinguished by their remaining lifetimes, which regulated the interplay between inexorable running time and individual's nourishment history. A food-limited environment induces intraspecific competition henceforth carrying capacity medium may be finite, often emulating qualitati...

Abstract With the increase of number modern equipment, expansion equipment scale, and requirements actual combat for long-term standby duty, role significance spare parts support scheme in life cycle system gradually become prominent. Taking electronic as research object, this paper analyzes relative changes between utilization rate fill under different composition scales. It introduces strateg...