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Traditionally, Lorentzian geometry has been used as a necessary tool to understand general relativity, as well as to explore new genuine geometric behaviors, far from classical Riemannian techniques. Recent progress has attracted a renewed interest in this theory for many researchers: long-standing global open problems have been solved, outstanding Lorentzian spaces and groups have been classified, new applications to mathematical relativity and high energy physics have been found, and further connections with other geometries have been developed.   Samples of these fresh trends are presented in this volume, based on contributions from the VI International Meeting on Lorentzian Geometry, held at the University of Granada, Spain, in September, 2011. Topics such as geodesics, maximal, trapped and constant mean curvature submanifolds, classifications of manifolds with relevant symmetries, relations between Lorentzian and Finslerian geometries, and applications to mathematical physics are included.     This book will be suitable for a broad audience of differential geometers, mathematical physicists and relativists, and researchers in the field.

Discrete groups. --- General relativity (Physics) -- Congresses. --- Geometry, Differential -- Congresses. --- Geometry, Differential --- General relativity (Physics) --- Mathematics --- Physical Sciences & Mathematics --- Geometry --- Geometry, Differential. --- Relativistic theory of gravitation --- Relativity theory, General --- Differential geometry --- Mathematics. --- Convex geometry. --- Discrete geometry. --- Differential geometry. --- Hyperbolic geometry. --- Convex and Discrete Geometry. --- Hyperbolic Geometry. --- Differential Geometry. --- Gravitation --- Physics --- Relativity (Physics) --- Global differential geometry. --- Groups, Discrete --- Infinite groups --- Discrete mathematics --- Convex geometry . --- Hyperbolic geometry --- Lobachevski geometry --- Lobatschevski geometry --- Geometry, Non-Euclidean --- Combinatorial geometry

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This book describes recent advances in the morphodynamics of mixed sand and gravel Mediterranean coasts, and provides updates and new methods for their study and management. It assesses how the differences in the geomorphic setting, in comparison with traditional sandy beaches, result in distinctive physical processes governing the dynamics of these coasts. Further, on the basis of field measurements, theoretical analysis and numerical modeling carried out at two study sites in southern Spain over the last 15 years, the book studies, analyzes and compares these physical processes and mechanisms. It also shows that the narrow and complex bathymetries and inner shelves modify the wave propagation patterns and hence, the longshore sediment transport gradients along the coast. Given the correlation between the changes in these gradients and the shoreline evolution over time, it identifies the complexity of the inner shelf bathymetries as the main driver of coastal changes and describes these processes in detail using, in the plan view, the inter-annual evolution of unaltered and “altered by human” beaches. Lastly, the book details how the generation and subsequent overlapping of berms across the beach profile are responsible for the sediment variability at depth and cross-shore, and concludes that the total run-up (including the water-level) is a more influential variable than wave height in the erosional/depositional response of these beaches.

Earth sciences. --- Oceanography. --- Coasts. --- Geomorphology. --- Civil engineering. --- Earth Sciences. --- Coastal Sciences. --- Civil Engineering. --- Geomorphic geology --- Physiography --- Coastal landforms --- Coastal zones --- Coastlines --- Oceanography, Physical --- Oceanology --- Physical oceanography --- Thalassography --- Geosciences --- Engineering --- Public works --- Earth sciences --- Marine sciences --- Ocean --- Physical geography --- Geomorphology --- Landforms --- Geography --- Seashore

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This book constitutes the refereed proceedings of the 4th International Conference on Technology Trends, CITT 2018, held in Babahoyo, Ecuador, in August 2018. The 53 revised full papers presented were carefully reviewed and selected from 204 submissions. The papers are organized in topical sections on communications; security and privacy; computer and software engineering; computational intelligence; e-government and e-participation.

Software engineering. --- Information systems. --- Software Engineering/Programming and Operating Systems. --- Computer Engineering. --- Information Systems and Communication Service. --- Computer software engineering --- Engineering --- Technological innovations. --- Breakthroughs, Technological --- Innovations, Industrial --- Innovations, Technological --- Technical innovations --- Technological breakthroughs --- Technological change --- Creative ability in technology --- Inventions --- Domestication of technology --- Innovation relay centers --- Research, Industrial --- Technology transfer --- Computer engineering. --- Computers. --- Automatic computers --- Automatic data processors --- Computer hardware --- Computing machines (Computers) --- Electronic brains --- Electronic calculating-machines --- Electronic computers --- Hardware, Computer --- Computer systems --- Cybernetics --- Machine theory --- Calculators --- Cyberspace --- Computers --- Design and construction

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Camera systems are being increasingly used in structural dynamics for measuring displacements of vibrating bodies due to a number of reasons. Mainly, they do not alter the system dynamics and can provide very spatially-dense data, since each pixel can be considered as a drift-free position sensor. Lately, accurate vision-based measurements of 3D displacements have frequently been retrieved using Three-Dimensional Digital Image Correlation (3-D DIC) and Three-Dimensional Point Tracking (3DPT). Both approaches make use of a stereo-camera system and find the 3D position of each point from the matching projections to each camera. Their fields of view must therefore overlap. This thesis, on the other hand, proposes a different approach. It is assumed that the mode shapes of the structure are known. If linearity holds, these mode shapes constitute a reduced coordinate system of the body dynamics. The position of any point in the vibrating structure at a given moment is completely defined by the displacement caused by each shape weighted with its respective modal contribution. The aim of the method proposed in this thesis is to compute these modal contributions for each video frame. The approach is designed so that all operations take place on the projected image space and the modal contributions of the 3D structure are directly solved in the projected problem. Therefore, a single camera can reconstruct all the contributions of the mode shapes that can be observed from its perspective. Additional cameras can increase the set of observable mode shapes, but are not used to find 3D positions. Consequently, the points tracked by each camera do not need to coincide: in fact, each one of them can cover different areas of the structure. The approach is numerically and experimentally tested. An optimized version for small displacements of the Lucas-Kanade method is also proposed and tested. Computation requirements are reduced in order to ease an eventual real-time implementation.