Bøker av Rui Li

This book focuses on soil and water conservation at global scale. It is a serious environmental problem that will threaten the socio-economic well-being of the majority of global population in future. The book examines the current situation of land degradation in multiple regions of the world and offers alternative approaches to solve the problems through sharing advanced technologies and lessons learned. It provides comprehensive assessment on characteristics, level and effect of degradation in different regions. It's a highly informative reference both for researchers and graduate students.

This book introduces the state-of-the-art algorithms for data and computation privacy.

Soft-Switching Technology for Three-phase Power Electronics ConvertersDiscover foundational and advanced topics in soft-switching technology, including ZVS three-phase conversionIn 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 circuitsPerfect 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 book introduces state-of-the-art experimental and numerical methods and examples for evaluating the drilling performance of engineering and biological materials, particularly in thermal aspects.

Die Weltfinanzkrise von 2008 hat die globale Wirtschaft in ihren Grundfesten erschuttert. Die Wurzeln dieser Erschutterung sind vom Prozess der wirtschaftlichen Globalisierung und Deregulierung der Markte nicht zu trennen. Wie werden die zugehorigen Entwicklungen und Erfahrungen jeweils in Ost und West konzeptualisiert und kommunikativ begleitet? Exemplarisch soll hier der kommunikative Reflex der genannten Ereignisse erfasst werden, insofern er in einschlagigen Texten ausgewahlter prominenter Presseorgane in Deutschland bzw. China prozessbegleitend manifest ist. Untersucht wird der Zeitrahmen von 1992 bis 2012, speziell die Resonanz auf die globalen Transformationsprozesse nach dem Zusammenbruch der Sowjetunion (1990-1992), auf die Asienkrise (1997-1999), auf das Platzen der 'Dotcom-Blase' (2000-2002) sowie auf die aktuelle Weltfinanzkrise (2008-2012). Die Untersuchung liefert einen Einblick dazu, wie das wirtschaftliche und wirtschaftspolitische Handeln magebender Akteure in den Texten reflektiert, kommentiert und bewertet wird. Methodisch greift die Untersuchung das Verfahren der linguistischen Frame-Analyse auf und verbindet dieses auf innovative Weise mit Verfahren der qualitativen Forschung aus den Sozialwissenschaften.

Unfolding in the tense years of the Cultural Revolution (1966-1976), Trees Without Wind takes place in a remote Shanxi village in which a rare affliction has left the residents physically stunted. Director Liu, an older revolutionary and local commune head, becomes embroiled in a power struggle with Zhang Weiguo, a young ideologue who believes he is the model of a true revolutionary. Complicating matters is a woman named Nuanyu, who, like Zhang Weiguo and Director Liu, is an outsider untouched by the village's disease. "e;Wedded"e; to all of the male villagers, Nuanyu lives a polyandrous lifestyle based on necessity and at odds with the puritanical idealism of the Cultural Revolution. The deformed villagers, representing the manipulated masses of China, become pawns in the Party representatives' factional infighting. Director Liu and Zhang Weiguo's explosive tug-of-war is part of a larger battle among politics, self-interest, and passion gripping a world undone by ideological extremism. A collectively told narrative powered by distinctive subjectivities, Trees Without Wind is a milestone in the fictional treatment of a horrific event.

This book will appeal to scientists and engineers who are concerned with the design of microwave wideband devices and systems. For advanced (ultra)-wideband wireless systems, the necessity and design methodology of wideband filters will be discussed with reference to the inherent limitation in fractional bandwidth of classical bandpass filters.