The waste from the processing of kaolin in the Amazonian region of Brazil was subjected to a calcination process at 700°C for 2 h to obtain metakaolin, which, together with sodium hydroxide and sodium silicate, formed the reaction mixture.This mixture was subjected to an aging step (24 h at 60 rpm), and a subsequent Two-Piece Knit Tops hydrotherma
This study aims to obtain empirical evidence of the absence of an average abnormal return, average volume Controllers trading activity, and bid-ask spread of stocks in the period around the event of the COVID-19 announcement as a global pandemic.The statement of the COVID-19 as the global pandemic of the World Health Organization (WHO) made the Ind
The tundish return prevents unsteady flow affecting on the steel cleanness and temperature.The presented article offers a new design of a ladle shroud (LS) with three holes placed in a special dome (separating the steel flow) steeped in a metal bath.Various options of the LS construction were analysed, as well as its positioning in the tundish in r
$AC$ power filters play an important role in limiting the high-frequency current harmonics injected by grid-tied voltage source converters (VSCs).Amongst the various types of filters, $LCL$ filters with integrated $LC$ traps have become popular due to their ability to achieve a size reduction of the grid side inductor while demonstrating a similar