David Sharpe – författare

This textbook is an introduction to the concept of factorization and its application to problems in algebra and number theory. With the minimum of prerequisites, the reader is introduced to the notion of rings, fields, prime elements and unique factorization. The author shows how concepts can be applied to a variety of examples such as factorizing polynomials, finding determinants of matrices and Fermat's 'two-squares theorem'. Based on an undergraduate course given at the University of Sheffield, Dr Sharpe has included numerous examples which demonstrate how frequently these ideas are useful in concrete, rather than abstract, settings. The book also contains many exercises of varying degrees of difficulty together with hints and solutions. Second and third year undergraduates will find this a readable and enjoyable account of a subject lying at the heart of much of mathematics.

Fully updated and authoritative reference to wind energy technology written by leading academic and industry professionalsThe newly revised Third Edition of the Wind Energy Handbook delivers a fully updated treatment of key developments in wind technology since the publication of the book's Second Edition in 2011. The criticality of wakes within wind farms is addressed by the addition of an entirely new chapter on wake effects, including 'engineering' wake models and wake control. Offshore, attention is focused for the first time on the design of floating support structures, and the new 'PISA' method for monopile geotechnical design is introduced.The coverage of blade design has been completely rewritten, with an expanded description of laminate fatigue properties and new sections on manufacturing methods, blade testing, leading-edge erosion and bend-twist coupling. These are complemented by new sections on blade add-ons and noise in the aerodynamics chapters, which now also include a description of the Leishman-Beddoes dynamic stall model and an extended introduction to Computational Fluid Dynamics analysis.The importance of the environmental impact of wind farms both on- and offshore is recognized by expanded coverage, and the requirements of the Grid Codes to ensure wind energy plays its full role in the power system are described. The conceptual design chapter has been extended to include a number of novel concepts, including low induction rotors, multiple rotor structures, superconducting generators and magnetic gearboxes.References and further reading resources are included throughout the book and have been updated to cover the latest literature. As in previous editions, the core subjects constituting the essential background to wind turbine and wind farm design are covered. These include: The nature of the wind resource, including geographical variation, synoptic and diurnal variations, and turbulence characteristicsThe aerodynamics of horizontal axis wind turbines, including the actuator disc concept, rotor disc theory, the vortex cylinder model of the actuator disc and the Blade-Element/Momentum theoryDesign loads for horizontal axis wind turbines, including the prescriptions of international standardsAlternative machine architecturesThe design of key componentsWind turbine controller design for fixed and variable speed machinesThe integration of wind farms into the electrical power systemWind farm design, siting constraints, and the assessment of environmental impactPerfect for engineers and scientists learning about wind turbine technology, the Wind Energy Handbook will also earn a place in the libraries of graduate students taking courses on wind turbines and wind energy, as well as industry professionals whose work requires a deep understanding of wind energy technology.

The fascinating story of Toronto’s experimental Rochdale College’s rise and fall, now reissued in a handsome A List edition.Toronto’s Rochdale College began as an experiment in living and learning, and ended as a symbol of the flower-child sixties, a financial and social controversy. In his well-researched and entertaining account, David Sharpe tells the fascinating story of the college’s seven-year rise and fall.Sharpe examines the contradictions of the Age of Aquarius squeezed into one stark skyscraper on Bloor Street in Toronto. He looks at the financing and the internal government of the college, as well as its creative achievements over the years and its contribution to the community. Rochdale: The Runaway College provides a lively, detailed picture of the day-to-day life of the college residents: the peace parties and joyful live-ins, as well as the police raids and the drug overdoses of the dark days.