This book in the ELT in Context series, co-authored by a Chinese teacher of English in China and an American teacher of English who worked in China, is a powerful example of international collaboration and highlights one of the distinctive features of this series. In this new volume, Joel Heng Hartse describes working as a foreign teacher of English at Zhejiang University and Jiang Dong describes his work as a local teacher of English at Yuanpei College. This combination brings together two equally important and complementary areas of expertise, in which one teacher-author can be considered to be an expert in the ELT system of that country he was educated in and is the product of that system, while the other teacher-author can be considered to be an expert in the use of the target language, in this case, English.

Perspectives on Teaching English at Colleges and Universities in China (ELT in Context Series)

Reference

Jiang, Dong

Joel Heng Hartse

English as a Second Language

TESOL Press

Advanced Pulse-Width-Modulation: With Freedom to Optimize Power Electronics Converters (CPSS Power Electronics Series)

<p><p>This book is a technical publication for students, scholars and engineers in electrical engineering, focusing on the pulse-width-modulation (PWM) technologies in power electronics area. Based on an introduction of basic PWM principles this book analyzes three major challenges for PWM on system performance: power losses, voltage/current ripple and electromagnetic interference (EMI) noise, and the lack of utilization of control freedoms in conventional PWM technologies. Then, the model of PWM's impact on system performance is introduced, with the current ripple prediction method for voltage source converter as example. With the prediction model, two major advanced PWM methods are introduced: variable switching frequency PWM and phase-shift PWM, which can reduce the power losses and EMI for the system based on the prediction model. Furthermore, the advanced PWM can be applied in advanced topologies including multilevel converters and paralleled converters. With more control variables in the advanced topologies, performance of PWM can be further improved. Also, for the special problem for common-mode noise, this book introduces modified PWM method for reduction. Especially, the paralleled inverters with advanced PWM can achieve good performance for the common-mode noise reduction. Finally, the implementation of PWM technologies in hardware is introduced in the last part.</p></p>

Engineering & Transportation

Li, Qiao

Shen, Zewei

Chen, Jianan

Liu, Zicheng

Engineering

Springer

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