http://www.sciepub.com/journal/MATERIALS American Journal of Materials Engineering and Technology is a peer-reviewed, open access journal that provides rapid publication of articles in all areas of materials engineering and technology. The goal of this journal is to provide a platform for scientists and academicians all over the world to promote, share, and discuss various new issues and developments in different areas of materials engineering and technology. Science and Education Publishing en 2013 Science and Education Publishing Co. Ltd All rights reserved. American Journal of Materials Engineering and Technology 9 1 January 2021 2013 Science and Education Publishing Co. Ltd All rights reserved. http://pubs.sciepub.com/materials/9/1/1 4) nano thin films in cancer cells, tissues and tumors under synchrotron and synchrocyclotron radiations is investigated. The calculation of thickness and optical constants of Ruthenium (IV) Oxide (RuO₂) and Ruthenium (VIII) Oxide (RuO₄) annealing effects on the interband transition and optical constants of Ruthenium (IV) Oxide (RuO₂) and Ruthenium (VIII) Oxide (RuO₄) nano thin films in cancer cells, tissues and tumors under synchrotron and synchrocyclotron radiations produced using sol-gel method over glassy medium through a single reflection spectrum is presented. To obtain an appropriate fit for reflection spectrum, the classic Drude-Lorentz model for parametric di-electric function is used. The best fitting parameters are determined to simulate the reflection spectrum using Lovenberg-Marquardt optimization method. The simulated reflectivity from the derived optical constants and thickness are in good agreement with experimental results.
]]> Alireza Heidari, Margaret Hotz, Nancy MacDonald, Victoria Peterson, Angela Caissutti, Elizabeth Besana, Jennifer Esposito, Katrina Schmitt, Ling-Yu Chan, Francesca Sherwood, Maria Henderson, Jimmy Kimmel 2021-08-19 Science and Education Publishing 2021-08-19 1 9 1 20 10.12691/materials-9-1-1 http://pubs.sciepub.com/materials/9/1/2 -1) and of other minerals have been found. Characterization of eggshell powder shows that the source of calcium consists mainly of CaCO₃. The apparent densities of geopolymer cement obtained decreased when the aluminosilicate materials (metakaolin) are replaced by proportions of eggshell powders and commercial calcium carbonate (0, 1, 3, 5, 7 and 10%). It was also observed that the compressive strengths of geopolymer cements based on eggshells are greater than those based on commercial calcium carbonate and the thermal conductivity decreases with the increase of the porogen. These results corroborates with that of the apparent density and compressive strength which decreases with the increase of the porogen. Results shows that geopolymer cements obtained have accumulated high pores in their structures. The values of thermal conductivity of the control and porous geopolymer cement from eggshell ranges between 0.10 and 0.17 W/mK, respectively. It was concluded that the low-value calcium carbonate-rich wastes (egg shell) could be used for producing porous geopolymer cements which could be utilized for thermal insulation applications.]]> Jeanne Atchana, Paul Nestor Djomou Djonga, Benoit Loura, Valery Gomdje Hambate, Jean Bosco Tchatchueng 2021-10-24 Science and Education Publishing 2021-10-24 1 9 21 30 10.12691/materials-9-1-2 http://pubs.sciepub.com/materials/9/1/3 Md. Anowar Hossain 2021-12-16 Science and Education Publishing 2021-12-16 1 9 31 47 10.12691/materials-9-1-3