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This book presents interesting samples of theoretical and practical advances of symmetry in multidisciplinary engineering applications. It covers several applications, such as accessibility and traffic congestion management, path planning for mobile robots, analysis of shipment service networks, fault diagnosis methods in electrical circuits and electrical machines, geometrical issues in architecture, geometric modeling and virtual reconstruction, design of noise detectors, filters, and segmentation methods for image processing, and cyclic symmetric structures in turbomachinery applications, to name but a few. The contributions included in this book depict the state of the art in this field and lay the foundation for the possibilities that the study of symmetry has in multidisciplinary applications in the field of engineering.

edge preserving --- fault diagnosis --- accessibility --- urban traffic planning --- sensitivity analysis --- graphic modelling --- Coalbrookdale (Shropshire) --- mobile robot --- asymmetry --- convexity/concavity --- flying buttresses --- vibration --- time-space network --- linearization technique --- friction damping --- adaptive threshold --- ring damper --- broad learning model --- Hilbert transform --- express shipment --- symmetry --- traffic control --- railcar flow distribution --- optimization --- industrial archaeology --- high order urban hospitals (HOUHs) --- thin-walled gear --- rampant arch --- traffic congestion --- railway transportation --- robots --- virtual reconstruction --- feature selection --- geometric modeling --- path search --- industrial heritage --- weighted mean filter --- topology --- A* algorithm --- traffic forecasting --- feature interaction --- classification --- peaks distribution --- rolling bearings --- noise detector --- 3D slicer --- inclined plane --- computing applications --- environmental modeling --- extension --- service network design --- evaluation model --- anomaly detection --- random forest --- local preserving projection --- complex networks --- computer engineering --- electronic devices --- BP neural network --- mechanical structures --- segmentation --- lifting wavelet --- semi-supervised random forest --- railway network --- cathedral --- local monotonicity --- aged --- optimum --- path planning --- local data features --- local inflection --- conditional mutual information --- energy dissipation --- support vector machine --- variational mode decomposition --- Agustín de Betancourt --- optimization criteria --- tumor --- trip impedance based on public transportation --- Fisher linear discriminant analysis --- synchronization --- clustering --- geometry --- electrical circuits --- random value impulse noise

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Engineering practice requires the use of structures containing identical components or parts, useful from several points of view: less information is needed to describe the system, design is made quicker and easier, components are made faster than a complex assembly, and finally the time to achieve the structure and the cost of manufacturing decreases. Additionally, the subsequent maintenance of the system becomes easier and cheaper. This Special Issue is dedicated to this kind of mechanical structure, describing the properties and methods of analysis of these structures. Discrete or continuous structures in static and dynamic cases are considered. Theoretical models, mathematical methods, and numerical analyses of the systems, such as the finite element method and experimental methods, are expected to be used in the research. Machine building, automotive, aerospace, and civil engineering are the main areas in which such applications appear, but they are found in most engineering fields.

exact solutions --- the generalized Benjamin–Bona–Mahony equation --- generalized exponential rational function method --- solitary wave solutions --- symbolic computation --- Thomson effect --- initial stress --- magneto-thermoelastic --- voids --- normal mode method --- G-N theory --- eigenvalue problem --- axisymmetric and non-axisymmetric vibrations --- multiparametric special functions --- circular plate --- functionally graded porous material --- initially stressed bodies --- dipolar structure --- volume fraction --- domain of influence --- chaotic time series prediction --- neural network --- firefly algorithm --- CEEMDAN --- VMD --- symmetric geometry --- guitar’s plate --- modal analysis --- skew symmetric eigenmodes --- comparison --- Friedman test --- linear regression --- nonlinear regression --- sign test --- symmetric errors --- Wilcoxon test --- coefficient of variation --- ratio --- symmetric and asymmetric distributions --- test of hypothesis --- multi-body system --- finite element method (FEM) --- linear elastic elements --- Lagrange’s equations --- two-dimensional finite element --- plane motion --- backward in time problem --- dipolar thermoelastic body --- uniqueness of solution --- Cesaro means --- partition of energies --- α-fractional calculus --- vibration isolation --- fractional-order differential equation --- rubber-like elastomers --- Riemann–Liouville/Caputo/Grünwald-Letnikov fractional derivative --- advanced mechanics --- analytical dynamics --- acceleration energies --- robotics --- viscoelasticity --- type III thermal law --- finite elements --- error estimates --- numerical results --- symmetry --- topology --- mechanical structures --- robots --- vibration --- mechanical engineering --- applied mechanics --- bird-strike impact --- composite laminate --- damage equivalency --- fan blade --- symmetrical configurations

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The Special Issue “Non-Destructive Testing of Structures” has been proposed to present the recent developments in the field of the diagnostics of structural materials and components in civil and mechanical engineering. The papers highlighted in this editorial concern various aspects of non-invasive diagnostics, including such topics as the condition assessments of civil and mechanical structures and the connections of structural elements, the inspection of cultural heritage monuments, the testing of structural materials, structural health monitoring systems, the integration of non-destructive testing methods, advanced signal processing for the non-destructive testing of structures (NDT), damage detection and damage imaging, as well as modeling and numerical analyses for supporting structural health monitoring (SHM) systems.

History of engineering & technology --- capillary-based structural health monitoring --- fatigue crack growth --- fatigue crack initiation --- XFEM --- straight lug --- cast-in-place concrete --- temperature --- boundary conditions --- on-line monitoring --- numerical simulations --- strength --- extradosed bridge --- SHM system --- delamination --- width-to-depth ratio (WTDR) --- concrete bridge deck --- handheld IR camera (H-IRC) --- UAV IR camera (UAV-IRC) --- passive IRT --- non-destructive technique --- concrete structure --- non-destructive evaluation --- crack effect --- metal magnetic memory --- magnetic intensity gradient --- stress --- non-destructive testing --- ultrasonic tomography --- graph theory --- concrete --- damage mechanics --- elastic degradation --- damage parameter --- internal length --- experimental research --- methodology --- floors --- cement-based materials --- casting --- forming --- non-destructive and semi-destructive tests --- laser scanning --- photogrammetry --- tachymetry --- bridge deflection --- non-contact measurement --- wave propagation --- damage detection --- numerical modelling --- hardness --- Barkhausen noise --- number of events --- non-destructive testing inverse problem --- adhesive joint --- concrete beam --- guided waves --- debonding --- damage imaging --- root mean square --- cracking pattern --- cracks --- cement composites --- image analysis --- historical floor --- integrated diagnostics --- ground penetrating radar --- ultrasonic testing --- in situ surveys --- finite-difference time-domain modeling --- masonry structures --- autoclaved aerated concrete masonry units (AAC) --- compressive strength --- minor-destructive (MDT) techniques --- non-destructive techniques (NDT) --- acoustoelastic effect (AE) --- quasi-brittle cement composites --- acoustic emission --- acoustic spectrum --- micro events --- acoustic nondestructive methods --- large format tiles --- real-life application --- mechanical load --- failure --- vibration signal analysis --- nondestructive testing --- Kalman filtering --- parameter identification --- magnetic Barkhausen noise --- magnetic anisotropy --- grain oriented steel --- time-frequency representation --- signal processing --- data mining methods --- digital image correlation --- region-based convolutional neural network --- machine learning --- crack monitoring --- crack detection and localization --- elastic waves --- neural networks --- force prediction --- flange connection --- static test --- soil-steel bridge --- terrestrial laser scanning --- finite element method (FEM) --- modelling and simulations --- material parameters identification --- vibration measurements --- testing --- operational modal analysis --- lighthouse --- historic tower --- steel structures --- stressed-skin effect --- diaphragm design --- trapezoidal sheeting --- condition assessment of steel structure --- structural health monitoring --- civil engineering structures --- mechanical structures --- damage detection and visualization --- modeling and simulations

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• Reference Manager
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The Special Issue “Non-Destructive Testing of Structures” has been proposed to present the recent developments in the field of the diagnostics of structural materials and components in civil and mechanical engineering. The papers highlighted in this editorial concern various aspects of non-invasive diagnostics, including such topics as the condition assessments of civil and mechanical structures and the connections of structural elements, the inspection of cultural heritage monuments, the testing of structural materials, structural health monitoring systems, the integration of non-destructive testing methods, advanced signal processing for the non-destructive testing of structures (NDT), damage detection and damage imaging, as well as modeling and numerical analyses for supporting structural health monitoring (SHM) systems.

History of engineering & technology --- capillary-based structural health monitoring --- fatigue crack growth --- fatigue crack initiation --- XFEM --- straight lug --- cast-in-place concrete --- temperature --- boundary conditions --- on-line monitoring --- numerical simulations --- strength --- extradosed bridge --- SHM system --- delamination --- width-to-depth ratio (WTDR) --- concrete bridge deck --- handheld IR camera (H-IRC) --- UAV IR camera (UAV-IRC) --- passive IRT --- non-destructive technique --- concrete structure --- non-destructive evaluation --- crack effect --- metal magnetic memory --- magnetic intensity gradient --- stress --- non-destructive testing --- ultrasonic tomography --- graph theory --- concrete --- damage mechanics --- elastic degradation --- damage parameter --- internal length --- experimental research --- methodology --- floors --- cement-based materials --- casting --- forming --- non-destructive and semi-destructive tests --- laser scanning --- photogrammetry --- tachymetry --- bridge deflection --- non-contact measurement --- wave propagation --- damage detection --- numerical modelling --- hardness --- Barkhausen noise --- number of events --- non-destructive testing inverse problem --- adhesive joint --- concrete beam --- guided waves --- debonding --- damage imaging --- root mean square --- cracking pattern --- cracks --- cement composites --- image analysis --- historical floor --- integrated diagnostics --- ground penetrating radar --- ultrasonic testing --- in situ surveys --- finite-difference time-domain modeling --- masonry structures --- autoclaved aerated concrete masonry units (AAC) --- compressive strength --- minor-destructive (MDT) techniques --- non-destructive techniques (NDT) --- acoustoelastic effect (AE) --- quasi-brittle cement composites --- acoustic emission --- acoustic spectrum --- micro events --- acoustic nondestructive methods --- large format tiles --- real-life application --- mechanical load --- failure --- vibration signal analysis --- nondestructive testing --- Kalman filtering --- parameter identification --- magnetic Barkhausen noise --- magnetic anisotropy --- grain oriented steel --- time-frequency representation --- signal processing --- data mining methods --- digital image correlation --- region-based convolutional neural network --- machine learning --- crack monitoring --- crack detection and localization --- elastic waves --- neural networks --- force prediction --- flange connection --- static test --- soil-steel bridge --- terrestrial laser scanning --- finite element method (FEM) --- modelling and simulations --- material parameters identification --- vibration measurements --- testing --- operational modal analysis --- lighthouse --- historic tower --- steel structures --- stressed-skin effect --- diaphragm design --- trapezoidal sheeting --- condition assessment of steel structure --- structural health monitoring --- civil engineering structures --- mechanical structures --- damage detection and visualization --- modeling and simulations