Aircraft Propulsion and Gas Turbine Engines Second Edition by Ahmed F. El-Sayed

Preface After accumulating a couple of thousand users (in academia and industry) from around the globe, this engine is due for an overhaul! Since an overhaul is a heavy repair/maintenance process, then, in this second edition of my engine book, a number of significant changes have been made to the scope, organization, and focus. In this edition, I have strived to cope with the technological and environmental challenges associated with thrust/power production. The scope of the book has been expanded to include rocket propulsion, unmanned aerial vehicles (UAVs), and biofuel….

Near Rings, Fuzzy Ideals and Graph Theory by Bhavanari Satyanarayana and Kuncham Syam Prasad

Preface Near rings, fuzzy ideals, and graph theory is a very fascinating course. Near ring theory has enormous applications in different subject areas such as digital computing, sequential mechanics, automata theory, graph theory, and combinatorics. The frst step toward near rings was axiomatic research done by Dickson in 1905. He exhibited that there do exist “felds with only one distributive law.” Near rings arise in a natural way. The set M(G) of all mappings of a group (G, ) into itself, with the usual addition and composition of mappings becomes…