Soft-Switching Technology for Three-phase Power Electronics Converters Discover foundational and advanced topics in soft-switching technology, including ZVS three-phase conversion In Soft-Switching Technology for Three-phase Power Electronics Converters, an expert team of researchers delivers a comprehensive exploration of soft-switching three-phase converters for applications including renewable energy and distribution power systems, AC power sources, UPS, motor drives, battery chargers, and more. The authors begin with an introduction to the fundamentals of the technology, providing the basic knowledge necessary for readers to understand the following articles. The book goes on to discuss three-phase rectifiers and three-phase grid inverters. It offers prototypes and experiments of each type of technology. Finally, the authors describe the impact of silicon carbide devices on soft-switching three-phase converters, studying the improvement in efficiency and power density created via the introduction of silicon carbide devices. Throughout, the authors put a special focus on a family of zero-voltage switching (ZVS) three-phase converters and related pulse width modulation (PWM) schemes. The book also includes: A thorough introduction to soft-switching techniques, including the classification of soft-switching for three phase converter topologies, soft-switching types and a generic soft-switching pulse-width-modulation known as Edge-Aligned PWM A comprehensive exploration of classical soft-switching three-phase converters, including the switching of power semiconductor devices and DC and AC side resonance Practical discussions of ZVS space vector modulation for three-phase converters, including the three-phase converter commutation process In-depth examinations of three-phase rectifiers with compound active clamping circuits Perfect for researchers, scientists, professional engineers, and undergraduate and graduate students studying or working in power electronics, Soft-Switching Technology for Three-phase Power Electronics Converters is also a must-read resource for research and development engineers involved with the design and development of power electronics.

This volume presents work from the IFIP TC 8 WG 8.9 International Conference on the Research and Practical Issues of Enterprise Information Systems (CONFENIS 2007). Enterprise information systems (EIS) have become increasingly popular. EIS integrate and support business processes across functional boundaries in a supply chain environment. In recent years, more and more enterprises world-wide have adopted EIS such as Enterprise Resource Planning (ERP) for running their businesses.

Covers the fundamental concepts and advanced modelling techniques of Doubly Fed Induction Generators accompanied by analyses and simulation results Filled with illustrations, problems, models, analyses, case studies, selected simulation and experimental results, Advanced Control of Doubly Fed Induction Generator for Wind Power Systems provides the basic concepts for modelling and controlling of Doubly Fed Induction Generator (DFIG) wind power systems and their power converters. It explores both the challenges and concerns of DFIG under a non-ideal grid and introduces the control strategies and effective operations performance options of DFIG under a non-ideal grid. Other topics of this book include thermal analysis of DFIG wind power converters under grid faults; implications of the DFIG test bench; advanced control of DFIG under harmonic distorted grid voltage, including multiple-loop and resonant control; modeling of DFIG and GSC under unbalanced grid voltage; the LFRT of DFIG, including the recurring faults ride through of DFIG; and more. In addition, this resource: Explores the challenges and concerns of Doubly Fed Induction Generators (DFIG) under non-ideal grid Discusses basic concepts of DFIG wind power system and vector control schemes of DFIG Introduces control strategies under a non-ideal grid Includes case studies and simulation and experimental results Advanced Control of Doubly Fed Induction Generator for Wind Power Systems is an ideal book for graduate students studying renewable energy and power electronics as well as for research and development engineers working with wind power converters.

Enterprise Information Systems (EIS) integrate and support business processes across functional boundaries in a supply chain environment, and have become increasingly popular over the last 15 years. In recent years, more and more enterprises world-wide have adopted EIS such as Enterprise Resource Planning (ERP) for running their businesses. Previously, information systems such as CAD, CAM, MRPII and CRM were widely used for partial functional integration within a business organization. With global operation, global supply chain, and fierce competition in place, there is a need for suitable EIS such as ERP, E-Business or E-Commerce systems to integrate extended enterprises in a supply chain environment with the objective of achieving efficiency, competency, and competitiveness. As a result, there is a growing demand for researching EIS to provide insights into challenges, issues, and solutions related to the design, implementation and management of EIS.
The papers in Frontiers in Enterprise Integration were selected from two premier international conferences: the International Forum of Information Systems Frontiers-Xian International Symposium (IFISF), June 29-30, 2006, Xian, China and the IFIP TC 8.9 International Conference on Research and Practical Issues of Enterprise Information Systems (Confenis 2007), October 14-16, Beijing, China. Both events provided an excellent opportunity for EIS academicians and practitioners in the world to gather and exchange ideas, and present original research in their fields. Advances in Enterprise Information Systems will be invaluable to scientists, researchers and professionals in EIS.

Please go to http: //www.ilearnispeak.com/books/numbers/samplebook/numbers_and_counting_sample.html for some high resolution sample pages. "Learn Chinese - Basic Skills for Preschool Learners of English and Chinese, Volume 4: Numbers and Counting" is the fourth book in a series of four workbooks designed to help parents and teachers introduce basic preschool skills in both English and Mandarin Chinese.

Most products on the market achieve only one of those goals, leaving you to use two sets of materials - one for teaching language learning, and one for teaching basic preschool skills. Our product is different. It teaches all the basic preschool skills in both English and Mandarin Chinese, helping young learners to develop the skills needed for entry into school, and starting them on a lifelong path of bilingual education.

With bright colored, sometimes exaggerated and funny illustrations, and instructions in both languages, parents and teachers are provided with the tools you need to teach your children in a bilingual atmosphere. For parents and teachers who are not fluent in both languages, an online supplement provides all audio from the text in both English and Chinese.

In this volume, children are introduced to numbers 0-20 and counting.

Please go to http: //www.ilearnispeak.com/books/basickskills/samplebook/Basic_Skills_Sample.html for some high resolution sample pages. "Learn Chinese - Basic Skills for Preschool Learners of English and Chinese, Volume 2: Relationships" is the second book in a series of four workbooks designed to help parents and teachers introduce basic preschool skills in both English and Mandarin Chinese.

Most products on the market achieve only one of those goals, leaving you to use two sets of materials - one for teaching language learning, and one for teaching basic preschool skills. Our product is different. It teaches all the basic preschool skills in both English and Mandarin Chinese, helping young learners to develop the skills needed for entry into school, and starting them on a lifelong path of bilingual education.

With bright colored, sometimes exaggerated and funny illustrations, and instructions in both languages, parents and teachers are provided with the tools you need to teach your children in a bilingual atmosphere. For parents and teachers who are not fluent in both languages, an online supplement provides all audio from the text in both English and Chinese.

In this volume, children are introduced to relationships including same and different, opposites, big and small, long and short, measuring, top and bottom, above and below. Children will also practice their address, phone number and family names.

This volume presents work from the IFIP TC 8 WG 8.9 International Conference on the Research and Practical Issues of Enterprise Information Systems (CONFENIS 2007). Enterprise information systems (EIS) have become increasingly popular. EIS integrate and support business processes across functional boundaries in a supply chain environment. In recent years, more and more enterprises world-wide have adopted EIS such as Enterprise Resource Planning (ERP) for running their businesses.