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UWB radar is the most promising radar system for the future. In addition, by combining the UWB and array signal processing, one can obtain 3-D images of the objects for classification and identification, which is very useful in many applications. To achieve high-resolution real-time 3-D imaging radar, two essential items are missing in the current technology: dedicated antenna systems for sparse C-scan acquisition and fast high-quality imaging algorithms. In this thesis we have focused on the development of dedicated sparse antenna systems, including the sparse array topology development and antenna element development, while imaging algorithm is out of scope of this research. The main conclusions and their novelties are presented as follows: 1. Novel microwave ASP antenna: In this thesis a novel ASP antenna working from 10 GHz to 18 ...
The term 'learning community' is one that has been broadly or narrowly defined depending on its context. It is now widely used in a range of settings, from schools and universities, to business work places, by many researchers (see, for example, Brown & Duguid, 1991; DuFour, DuFour, Eaker, & Many, 2010; Wenger, Trayner, & de Laat, 2011). While the term has slipped into common - often idiosyncratic - usage a review of the literature highlights how the meaning of learning community has evolved over time, reinforcing the need to investigate more rigorously how practitioners in different contexts understand their situation as a learning community. As understood commonly now a 'learning community' is more than just a group of people who simply work together in the same space, but what are its essential features and how are these p...
Shear loading on structures has been recognized as one of the most relevant actions determining structural safety since the 19th century. In the case of reinforced concrete structures, despite the great efforts that have been made through experimental and theoretical research over many years, the nature of the shear failure process of a reinforced concrete beam without shear reinforcement has always, for a substantial part, remained a riddle. The present research work takes a new look at this old problem. The mechanism of flexural shear failure for a reinforced concrete beam without shear reinforcement is explained fundamentally, based on which a new failure criterion is proposed. The study leds to a shear evaluation that is in excellent agreement with test results.
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