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This text on "Operator Frames in Hilbert Spaces" for students and researchers are self-contained and give more and comprehensive coverage of the topics like Frames, K-frames, g-frames and kg-frames. This book is divided in to five chapters. the first chapter contains brief introduction of this book. Chapter 2 Presents basic information of frames, Bessel sequences, Riesz basis, types of frames in Hilbert spaces and frame operator, Chapter 3 contains the definitions of different types of K- frames and examples, frame operators of K-frames, and some results on K-frame operators are established....

Today the world is looking towards the efficient energy generation from renewable energy sources because of extinction of fossil fuels.Wind energy is a promising source of green energy.But the problem associated with this kind of energy id due to varying wind speeds the out put is also varying so it is not possible to integrate it to grid.Here Induction generators are dominantly used because of their advantages in variable speed torque characteristics.In this book an attempt is made to discuss different types of generators used in wind energy and different topologies for control of voltage...