【簡介】 Celebrating 50 Years of the Hallmark Text in Recreation and Leisure Studies! Kraus’ Recreation and Leisure in Modern Society provides a detailed introduction to the history, developments, and current trends in leisure studies. The Twelfth Edition focuses on the challenges and opportunities impacting the profession--including dramatic demographic changes, new technologies, and innovations in marketing--through an array of pedagogical features, including engaging sidebars and case studies addressing contemporary issues. Focusing on ten different types of organizations--ranging from nonprofit community organizations and armed forces recreation to sports management and travel and tourism sponsors--the Twelfth Edition is an invaluable resource for students considering a career in the recreation and leisure industry. Every new print copy includes Navigate Advantage access with interactive eBook, practice activities, and assessments. Instructor resource include quizzes, midterm and final exam, slides in PowerPoint format, instructor manual, syllabus, and additional cases. Written for the freshman or sophomore undergraduate course in Recreation and Leisure studies Introduction to Recreation and Leisure Foundations of Recreation and Leisure History and Philosophy of Recreation and Leisure Leisure in Society (c) 2022 350 pages
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【簡介】 New edition of the popular reference on machine analysis, focusing on reference frame theory with techniques for derivation of equations Analysis of Electric Machinery and Drive Systems covers the concepts needed to understand the evolution of electrical and magnetic variables for designing the power-electronic circuits that supply or extract electrical energy from a variety of machines, comprehensively addressing the varied needs of readers in the electric machinery, electric drives, and electric power industries. This fourth edition has been extensively revised and updated to include nine new or updated chapters on symmetrical three-phase stators, symmetrical induction machines, brushless DC machines, synchronous machines, neglecting electric transients, eigenvalues and voltage-behind-reactive machine equations, direct current machine and drive, and torque control of permanent-magnet and synchronous reluctance machines. Introductory concepts related to the subject have also been expanded upon, detailing stationary magnetically coupled circuits, energy balance relationships, energy in coupling field, and steady-state and dynamic performance of electromechanical systems. The fourth edition also includes illustrations of the free-acceleration characteristics of induction and brushless dc machines viewed from various reference frames and many other topics. With problems at the end of each chapter to reinforce learning, the book explores additional topics including: Operational impedances and time constraints of synchronous machines, covering Park’s equations in operational form and parameters from short-circuit and frequency-response characteristics Fully controlled three-phase bridge converters, covering six-step, sine-triangle, space-vector, hysteresis, and delta modulations, along with open- and closed-loop voltage and current regulations Motor drives, covering volts-per-hertz, constant slip current, field-oriented, and direct torque control as well as slip energy recovery drives Brushless DC motor drives, covering average-value analysis, steady-state performance, and transient and dynamic performance of voltage-source inverter drives Analysis of Electric Machinery and Drive Systems, Fourth Edition, is a perfect resource for electrical engineering students and an essential, up-to-date reference for electrical and mechanical engineers working with drives. 【目錄】 1 Introductory Concepts 2 Symmetrical Three-Phase Stator 3 Symmetrical Induction Machine 4 Brushless DC Machine 5 Synchronous Machines 6 Neglecting Electric Transients 7 Machine Equations in Operational Impedances and Time Constants 8 Eigenvalues and Voltage-Behind-Reactance Machine Equations 9 Semi-Controlled Bridge Converters 10 Fully Controlled Three-Phase Bridge Converters 11 Direct-Current Machine and Drive 12 Torque Control of Permanent-Magnet and Synchronous Reluctance Machines 13 Induction Motor Drives 14 Permanent-Magnet AC Motor Drives Appendix A Abbreviations, Constants, Conversions, and Identities Appendix B Phasors and Phasor Diagrams
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