Predictive Method for Chemical Structure Changing of Turbine Oil

Abstract

Lubricants are influenced over their lifetimes by various factors such as temperature, oxygen, water contamination, etc. which affect the chemical structure and implicitly their specific characteristics. If the degradation of the oils is significant and the characteristic values exceed certain limits that are defined for the safe operation, the lubricants should be replaced. The main purpose of the present study is to offer an efficient and predictive method for an adequate quality control of lubricant oils in service and implicitly for their adequate and safe operation. The method developed in this study consists in a numerical algorithm (the multiple regression) and is based on the monitoring of lubricant oils� representative characteristics in time and allows estimating the evolution of the oils characteristics during the service period as well as the prediction of the life-time of the oils.

Synthesis and Thermal Treatment of Hydroxyapatite Doped with Magnesium, Zinc and Silicon

“…Here we report a simple aqueous precipitation method for the preparation of pure hydroxyapatite and hydroxyapatite doped with a various content of magnesium, zinc, and silicon, used separately and combined. The significant influence of the preparation methodology and thermal treatment approach on the features of multi-substituted Hap is evidenced in this work for various hydroxyapatites, doped with Mg, Zn and Si, and it is also documented for the fabrication of various other compounds [37][38][39].…”