Coronavirus disease 2019 (COVID-19), the respiratory disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), was first identified in Wuhan, China and has since become pandemic. In response to the first cases identified in the…
O consumo mundial crescente de fertilizantes e a consequente preocupação com as questões ambientais estimulam o desenvolvimento de tecnologias que, simultaneamente, promovam o aumento da produtividade agrícola e minimizem os danos ao ambiente. Uma…
The COVID-19 pandemic presents the worst public health crisis in recent history. The response to the COVID-19 pandemic has been challenged by many factors, including scientific uncertainties, scarcity of relevant research, proliferation of…
In this paper, an extended SEIR model with a vaccination compartment is proposed to simulate the novel coronavirus disease (COVID-19) spread in Saudi Arabia. The model considers seven stages of infection: susceptible (S), exposed (E), infectious (I),…
With the emergence of one of this century’s deadliest pandemics, coronavirus disease (COVID-19) has an enormous effect globally with a quick spread worldwide. This made the World Health Organization announce it as a pandemic. COVID-19 has pushed…
Introduction: Unexpected eruption and global dissemination of Coronavirus disease (COVID-19) has tested the healthcare systems of both developed and developing countries. Objective: To analyze the spectrum of novel coronavirus infection in a tertiary…
Abstract Lately, many studies were offered to introduce the population dynamics of COVID-19. In this investigation, we extend different physical conditions of the growth by employing fractional calculus. We study a system of coupled differential…
Many health systems over the world have collapsed due to limited capacity and a dramatic increase of suspected COVID-19 cases. What has emerged is the need for finding an efficient, quick and accurate method to mitigate the overloading of…
La cuestión de género en el campo se presenta como un tema que no se ve con la profundidad requerida por el derecho puesto por el Estado en nuestro país. La investigación de este trabajo establece la realidad de las mujeres rurales brasileñas, de…