Acrylamide route for the co-synthesis of tungsten carbide-cobalt nanopowders with additives

In this work, cemented tungsten carbide nano-particles were prepared by a chemical method called acrylamide gel. In this process, first, a xerogel containing tungsten and cobalt oxide particles was synthesized. Then, it was carburized by a hydrogen reduction heating process.Acrylamide and N, N-methylene-bis-acrylamide monomers were used as an in-situ carbon. Ammonium meta tungstate (NH4)6H(2)W(12)O(40)center dot xH(2)O, and cobalt nitrate Co(NO3)(2)center dot 6H(2)O salts were used as the precursor.Both reduction and carburization reactions were carried out simultaneously and the formation of the intermediate phases of W2C, Co3W3C, and Co6W6C led to decrease in the activation barrier.Transactions of reduction and carburization processes were studied by X-ray diffraction analysis at various temperatures. Accordingly, tungsten carbide phase formation was completed at 1100 degrees C. The formation of W-C and V-C bonds was verified by Raman spectroscopy. SEM images showed the average nano particle size of 50 nm. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved

A Novel Approach to Numerical Modeling of Metabolic System: Investigation of Chaotic Behavior in Diabetes Mellitus

Although many mathematical models have been presented for glucose and insulin interaction, none of these models can describe diabetes disease completely. In this work, the dynamical behavior of a regulatory system of glucose-insulin incorporating time delay is studied and a new property of the presented model is revealed. This property can describe the diabetes disease better and therefore may help us in deeper understanding of diabetes, interactions between glucose and insulin, and possible cures for this widespread disease