Application of Taguchi Method for Optimization of Process Parameters for Wear loss of LM25/Flyash Composite
Metal matrix composites (MMCs) are now gaining their usage in tribological industries because of their inherent properties like high strength to weight ratio, low wear rate etc. The present study deals with investigation relating to the influence of wear parameters like sliding speed, applied load, reinforcement wt% and sliding distance on the dry sliding wear. A pin-on-disc apparatus was used to conduct the dry sliding wear test. The design of experiment approach was employed to acquire data in controlled way using Taguchi method. Multiple regression analysis, Signal-to-Noise ratio and Analysis of Variance were employed to investigate the wear behaviour of aluminium composite. The incorporation of fly ash as reinforcement material in aluminium matrix material improves the tribological characteristics.
Effect of Sintering Temperature, Load and Sliding speed on the Wear behavior of Mg-SiC-Al2O3 metal matrix Composites using Taguchi method
In the present study, Powder metallurgy method is used to fabricate Magnesium metal matrix composites (MMCs) having Silicon carbide (SiC) and Alumina (Al2O3) in 15 wt%. The dry sliding wear tests were carried out on composite material using a pin-on-disc wear testing apparatus with a normal pin load of 19.62N, 39.24N and 58.86N, and wear rate for each load is calculated for different sliding speeds. By using Taguchi’s design of experiments (DOE) Analytical modelling of composite material is performed with L9 orthogonal array. Analysis of Variance (ANOVA) has been used to find out the design parameters that significantly affect the composite material's wear rate. A linear regression model has been developed based on the experimental results. The resulting regression equation establishes a relationship between the significant terms obtained from ANOVA, namely applied load, sliding speed, sintering temperature and their relations.
The Russian language maintenance and language contacts
In our introductory article, we outline the main sociolinguistic features of Russian as a heritage language of post-Soviet immigrants in European settings and beyond. We offer a general overview of the evolution of Russian as a global language, with a particular focus on its geodemographics and economic and social value as a lingua franca . Based on this, we analyse the main principles defining the maintenance of Russian as a language of migration and as a heritage language in different countries, and emphasise the most important questions that still need to be addressed in this field of research. The main objective of this special issue is to combine the most recent research on the vitality of different languages of post-Soviet republics in new political milieu, with a particular focus on European and Asian countries, but there are other objectives as well. We propose to explore the factors that have either favoured or hindered the maintenance and transmission of languages of post-Soviet immigrants and repatriates, and how these sociolinguistic processes become evident in language vitality on both private and public levels. Our special issue primarily addresses the questions of family language policy, new language contacts and their management, and linguistic landscape in heritage speakers, diasporas and their new settings in Europe, Asia and the US.