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Magnetic materials, the intend of the present book is very important in many fields of science, engineering and technology. This book contains introduction to the field of magnetic materials specially soft magnetic materials, its synthesis parameters, spinel structure formation and also their optical and magnetic properties. The book will supply fundamental knowledge on spinels and cover broad range of related topics. It would give great pleasure to the authors if the content of this book can provide useful information which may be used to inspire the readers to new research directions.

Water is a valuable product, which should be used carefully. Increased global consumption of water has become a growing concern from a few decades, which has increased the demand of water recycling and reuse of waste-water by treating it with appropriate methods and technologies to meet the needs and aspirations of future generation. The reuse and recycling of laundry waste-water was carried out at lab scale. In this study, two random laundries were selected. A survey of PU and LCWU hostel laundries was made to characterize the laundry waste-water. A low cost sand and gravel filter was...