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This book brings together the work of African scholars and educators directly involved in initiatives to improve the teaching and learning of English in higher education across Africa. Offering alternative perspectives across different African countries with examples of decolonised practice in research, the book provides a critical discussion and examples of successful practice in the teaching of English in Africa. Each chapter of the book reports on a specific context and a specific teaching and/or learning initiative in higher education, with emphasis on comparability of information and on clear evaluation and critical analysis of the intervention. The editors offer a thoughtful comparison of different methods, strategies and results to provide an authoritative reference to effective strategies for English teaching and learning. The book paints a cohesive picture of the field of English language teaching in Africa and will be of great interest to researchers, scholars and postgraduate students in the areas of applied linguistics, English teaching and comparative education.
The machinability of powder metallurgy steels is poorer compared with wrought steels of appropriate composition and/or mechanical [properties. The reason for it is a larger number of material and processing variables affecting the final properties of a sintered material. Therefore the machining of powder metallurgy (PM) steels is a permanent subject of investigation and practice. The aim of the book is to make on the basis of present knowledge an overview of all interacting factors in machining process including those applied for the improvement of the machinability. There are the properties of basic plain iron and alloyed powders, various additions, compaction and sintering conditions. Effe...