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Collectively working robot teams can solve a problem more efficiently than a single robot, while also providing robustness and flexibility to the group. Swarm robotics model is a key component of a cooperative algorithm that controls the behaviors and interactions of all individuals. The robots in the swarm should have some basic functions, such as sensing, communicating, and monitoring, and satisfy the following properties: Autonomy-Individuals that create the swarm robotic system are autonomous robots. They are independent and can interact with each other and the environment. Large number-They are in large number, enabling cooperation. Scalability and robustness-A new unit can be easily added to the system, so the system can be easily scaled. A greater number of units improves the performance of the system. The system is quite robust to the loss of some units, as some units still remain to perform, although the system will not perform to its maximum capabilities. Decentralized coordination-The robots communicate with each other and with their environment to make final decisions. Flexibility-The swarm robotic system has the ability to generate modularized solutions to different tasks.

n/a --- self-organization --- signal source localization --- multi-robot system --- sensor deployment --- parallel technique --- shape normalization --- genetic algorithm --- multiple robots --- optimization --- improved potential field --- optimal configuration --- autonomous docking --- asymmetrical interaction --- comparison --- behaviors --- patterns --- self-assembly robots --- congestion control --- surface-water environment --- target recognition --- coordinate motion --- UAV swarms --- formation reconfiguration --- swarm robotics --- swarm intelligence --- artificial bee colony algorithm --- obstacle avoidance --- fish swarm optimization --- search algorithm --- robotics --- time-difference-of-arrival (TDOA) --- formation --- mobile robots --- formation control --- meta-heuristic --- event-triggered communication --- search --- virtual structure --- 3D model identification --- surveillance --- event-driven coverage --- scale-invariant feature transform --- system stability --- Swarm intelligence algorithm --- bionic intelligent algorithm --- unmanned aerial vehicle --- underwater environment --- artificial flora (AF) algorithm --- swarm behavior --- weighted implicit shape representation --- Cramer–Rao low bound (CRLB) --- environmental perception --- particle swarm optimization --- modular robots --- cooperative target hunting --- virtual linkage --- multi-AUV --- consensus control --- panoramic view --- nonlinear disturbance observer --- sliding mode controller --- path optimization --- Swarm Chemistry --- multi-agents --- Cramer-Rao low bound (CRLB)

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Acoustic emission (AE) techniques have successfully been used for assuring the structural integrity of large rocket motorcases since 1963, and their uses have expanded to ever larger structures, especially as structural health monitoring (SHM) of large structures has become the most urgent task for engineering communities around the world. The needs for advanced AE monitoring methods are felt keenly by those dealing with aging infrastructures. Many publications have appeared covering various aspects of AE techniques, but documentation of actual applications of AE techniques has been mostly limited to reports of successful results without technical details that allow objective evaluation of the results. There are some exceptions in the literature. In this Special Issue of the Acoustics section of Applied Sciences, we seek contributions covering these exceptions cited here. Here, we seek contributions describing case histories of AE applications to large structures that have achieved the goals of SHM by providing adequate technical information supporting the success stories. Types of structures can include aerospace and geological structures, bridges, buildings, factories, maritime facilities, off-shore structures, etc. Experiences with AE monitoring methods designed and proven for large stru

acoustic emission --- thermal cracking --- asphalt pavements --- embrittlement temperatures --- recycled asphalt pavements --- recycled asphalt shingles --- cooling cycles --- closed-form solution --- outlier --- time difference of arrival --- weight estimation --- structural diagnosis --- attenuation --- source location --- sensing --- signal processing --- structural health monitoring --- time series analysis --- b-value --- natural time --- critical phenomena --- reliability --- structural integrity --- crack growth --- fatigue life prediction --- uncertainty analysis --- nondestructive testing --- non-destructive testing --- hydrotreater --- bridge --- high temperature --- gas adsorber --- rotary kiln --- dragline --- acoustic emission (AE) --- non-destructive methods (NDT) --- diagnostic methods --- bridges --- structural health monitoring (SHM) --- acoustic emission swarm --- 2011 Tohoku earthquake --- repeating earthquake --- multiplet --- crustal movement --- optimized EEMD --- 2D-MUSIC --- composite structure --- impact localization --- part qualification --- structural design --- composites --- nondestructive evaluation (NDE) --- in situ acoustic emission (AE) monitoring --- mines --- host rock --- remote monitoring --- corrosion --- nuclear facilities --- alkali-silica reaction --- pattern recognition --- confinement --- damage evaluation --- beam --- vibration --- high-rate dynamics --- n/a

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Scientific and societal concern about the effects of underwater sound on marine ecosystems is growing. While iconic megafauna was of initial concern, more and more taxa are being included. Some countries have joined in multi-national initiatives to measure, monitor and mitigate environmental impacts of ocean noise at large, trans-boundary spatial scales. Approaches to regulating ocean noise change as new scientific evidence becomes available, but may also differ by country. The OCEANOISE conference series has provided a platform for the exchange of scientific results, management approaches, research needs, stakeholder concerns, etc. Attendees have represented various sectors, including academia, offshore industry, defence, NGOs, consultants and government regulators. The published articles in the Special Issue cover a range of topics and applications central to ocean noise.

Acústica submarina --- military aircraft --- noise pollution --- ocean noise --- Endangered species --- human health --- animal behavior --- vessel noise --- radiated noise levels --- monopole source levels --- propagation loss --- animat --- air gun --- impact assessment --- marine vibroseis --- marine mammal --- sound propagation --- underwater noise modeling and mapping --- underwater noise effects --- ocean noise regulations --- underwater acoustics --- underwater sound impacts --- marine conservation --- coastal areas --- fish --- anthropogenic noise --- passive acoustic monitoring --- protected species --- reproduction --- underwater noise --- sound propagation modelling --- multivariate mixture model --- acoustic zone --- ship noise --- Australian EEZ --- source levels --- marine shipping --- automated identification system --- sound mapping --- management --- anthropogenic sound --- seismic surveys --- electromagnetic surveys --- behavioral response studies --- severity scoring of responses --- controlled exposure experiments --- cetaceans --- Physeter macrocephalus --- continuous naval sonar --- marine soundscape --- wind noise --- whale song --- fish chorus --- marine mammal conservation --- behavioral disturbance --- hearing impairment --- auditory masking --- seismic airgun source --- particle motion --- ground motion --- geophysical instruments --- bioacoustics of marine mammals --- underwater acoustic propagation --- animal communication --- acoustic propagation --- whistle detection --- time difference of arrival --- underwater acoustic --- underwater sound sensing --- ocean sound measurement --- seismic interface waves --- dispersion --- water-particle velocity --- seabed vibration --- permanent threshold shift --- synaptopathy --- neuropathy --- auditory brainstem response --- behavioral thresholds --- sea lice --- Lepeophtheirus salmonis --- acoustic trauma --- transmission electron microscopy --- scanning electron microscopy --- ocean noise mitigation --- ocean noise regulation --- small vessel source levels --- acoustic techniques --- hydrophone-based observations --- shallow water --- pinnipeds --- apple snail --- Pomacea maculata --- invasive species --- plague --- mitigation method --- salmon --- Salmo salar --- scanning electron microcopy --- otolith organ --- lateral line --- histopathology --- vaterite --- neuromast

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Scientific and societal concern about the effects of underwater sound on marine ecosystems is growing. While iconic megafauna was of initial concern, more and more taxa are being included. Some countries have joined in multi-national initiatives to measure, monitor and mitigate environmental impacts of ocean noise at large, trans-boundary spatial scales. Approaches to regulating ocean noise change as new scientific evidence becomes available, but may also differ by country. The OCEANOISE conference series has provided a platform for the exchange of scientific results, management approaches, research needs, stakeholder concerns, etc. Attendees have represented various sectors, including academia, offshore industry, defence, NGOs, consultants and government regulators. The published articles in the Special Issue cover a range of topics and applications central to ocean noise.

Acústica submarina --- military aircraft --- noise pollution --- ocean noise --- Endangered species --- human health --- animal behavior --- vessel noise --- radiated noise levels --- monopole source levels --- propagation loss --- animat --- air gun --- impact assessment --- marine vibroseis --- marine mammal --- sound propagation --- underwater noise modeling and mapping --- underwater noise effects --- ocean noise regulations --- underwater acoustics --- underwater sound impacts --- marine conservation --- coastal areas --- fish --- anthropogenic noise --- passive acoustic monitoring --- protected species --- reproduction --- underwater noise --- sound propagation modelling --- multivariate mixture model --- acoustic zone --- ship noise --- Australian EEZ --- source levels --- marine shipping --- automated identification system --- sound mapping --- management --- anthropogenic sound --- seismic surveys --- electromagnetic surveys --- behavioral response studies --- severity scoring of responses --- controlled exposure experiments --- cetaceans --- Physeter macrocephalus --- continuous naval sonar --- marine soundscape --- wind noise --- whale song --- fish chorus --- marine mammal conservation --- behavioral disturbance --- hearing impairment --- auditory masking --- seismic airgun source --- particle motion --- ground motion --- geophysical instruments --- bioacoustics of marine mammals --- underwater acoustic propagation --- animal communication --- acoustic propagation --- whistle detection --- time difference of arrival --- underwater acoustic --- underwater sound sensing --- ocean sound measurement --- seismic interface waves --- dispersion --- water-particle velocity --- seabed vibration --- permanent threshold shift --- synaptopathy --- neuropathy --- auditory brainstem response --- behavioral thresholds --- sea lice --- Lepeophtheirus salmonis --- acoustic trauma --- transmission electron microscopy --- scanning electron microscopy --- ocean noise mitigation --- ocean noise regulation --- small vessel source levels --- acoustic techniques --- hydrophone-based observations --- shallow water --- pinnipeds --- apple snail --- Pomacea maculata --- invasive species --- plague --- mitigation method --- salmon --- Salmo salar --- scanning electron microcopy --- otolith organ --- lateral line --- histopathology --- vaterite --- neuromast