Purpose: Ecological and laboratory studies suggest face masks are an effective non-pharmaceutical intervention for reducing spread of SARS-CoV-2.These studies cannot measure individual risk reduction or account for individual behavioral and demographic confounders.Here we present a novel longitudinal assessment of the protective role of masks in a
Angola is a coastal west-central African state which currently stands as one of the fastest growing economies on the sub-continent.Angola’s development as a burgeoning economic powerhouse has been attained despite a protracted and brutal civil conflict spanning several decades.In the current post-conflict era, Angola has emerged as one of the
Background: Academic institutions risk losing vital digital information if urgent measures are not taken to safeguard digital resources and to allow for long-term access.New systems and technologies are thus needed to deal with the digital preservation challenges.Objectives: The purpose of this article was to investigate the systems and technologie
In this paper, we describe two new algorithms which are modifications of the Hestens-stiefl CG-method.The first is the scaled CG-method (obtained from function and gradient-values) which improves the search direction by multiplying to a Impedance Simulator scalar obtained from function value and its gradient at two successive points along the itera
Abstract Background and objectives: A major problem for labs.esp.medico legal centers is drug test false positive and Face Covers negative results.Using carbon paper, sodium bicarbonate or oral contraceptive pills (OCP) are common among addict people to make the results negative.Therefore, we decided to evaluate the effect of carbon paper, sodium b