Bøger af Yong Li

This book provides the systematic knowledge of a novel process of servo scanning 3D micro-electro-discharge machining (SS-3D micro-EDM), covering principles, methods, technologies, and optimization for machining 3D microstructures of conductive materials. The content emphasizes the systematic knowledge as well as the frontier research progress of SS-3D micro-EDM, allowing it to be used as a reference handbook for planning the whole machining process of 3D microstructures, for designing machining systems or machine tools, and even for understanding the ideas of innovative processes. The processes and the machine tools of SS-3D micro-EDM have promising applications in multi-fields for machining micro-devices or microstructures made of melt and metal alloy materials. The included methods and technologies are verified by testing and machining experiments. Thus, this book presents many machining examples, including the experimental parameters, conditions, and systems. These help the readers understand the concepts, theories, and methods easily and provide practical operation guidance for engineering applications in industrial machining processes and machine tools.

This book intends to report the new results of the microgrid in stability analysis, flexible control and optimal operation. The oscillatory stability issue of DC microgrid is explored and further solved. Flexible and stable voltage & frequency control of microgrid is put forward considering the distributed generations or distributed energy storages. The optimal operation of multi-energy is researched in view of economic efficiency and low-carbon development. The results of this book are original from authors who carry out the related research together for a long time, which is a comprehensive summary for authors¿ latest research results. The book is likely to be of interest to university researchers, electrical engineers and graduate students in power systems, power electronics, renewable energy and microgrid.

Don't forget those scholars who make great contributions to the fracture mechanics and the structural engineering. Alan Arnold Griffith (13 June 1893 ¿ 13 Oct 1963)was an English engineer, who, among many other contributions, is best known for his work on stress and fracture in metals that is now known as metal fatigue, as well as being one of the first to develop a strong theoretical basis for the jet engine. George Rankine Irwin (26 Feb 1907 ¿ 9 Oct 1998)was an American scientist in the field of fracture mechanics and strength of materials. He first identified the linear elastic stress intensity as a quantitative measure of the associated mathe-matical singularity, and then laid the foundation of a relevant stress analysis system. James Robert Rice (3 Dec 1940)is a mechanician who has made fundamental contributions to various aspects of solid mechanics. Two of his early contributions are the concept of the J-integral and an explanation of how plastic deformations localize in a narrow band.

The book collects new research ideas and achievements including adelay-dependent robust design method, a wide area robust coordination strategy,a hybrid assessment and choice method for wide area signals, a free-weightingmatrices method and its application, as well as the online identificationmethods for low-frequency oscillations.