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Dynamic stability basically deals with the interactions between the system's components. Following a disturbance, the system's variables undergo transitions that can induce oscillations in active and reactive power generation, resulting in the occurrence of voltage oscillatory modes and frequency deviation in the system. Depending on the entity of the disturbance, the small- or large-signal stability of the system under consideration can be investigated. The introduction of RES-based generation that does not participate in the network services (i.e., frequency and voltage regulation) due to lack of special controls will undoubtedly affect both the overall frequency and voltage stability. Large-scale transient stability is also a concern not to be overlooked: inverter-based wind and solar generation have different angle/speed swing behaviors with respect to traditional generation due to reduced inertia, different voltage swing behaviors due to different voltage control systems, different power flow patterns, and different displacements of synchronous generation at key locations. Therefore, although power system stability and dynamics have played a very central role in the management and study of electrical power systems thus far, it is also true that the emerging scenario requires new methodologies, technologies, and analyses. In this light, the current Special Issue aims to collect contributions (i.e., research papers and review articles) on power system dynamics and stability from experts in academia and industry.

Technology: general issues --- History of engineering & technology --- power system stability --- inertia estimation --- PMU --- microgrids --- frequency control --- grid-forming --- 100% converter-interfaced generation --- virtual synchronous machine --- forced oscillation --- inverter-based resources (IBRs) --- grid vulnerability analysis --- active power modulation --- virtual inertia --- fast frequency measurement --- fast frequency regulation --- distributed energy resources --- ancillary services --- power hardware-in-the-loop --- legacy resources --- large perturbation angle stability --- small perturbation angle stability --- voltage stability --- synthetic inertia --- demand response --- reactive compensation --- power system restoration --- primary frequency control --- frequency nadir estimation --- low inertia systems --- real-time dynamic simulation --- national power grid --- cyber physical system (CPS) --- co-simulation --- battery energy storage system (BESS) --- energy management system (EMS) --- load modelling --- line modelling --- power system analysis --- transient stability --- small-signal stability --- inverter-based resources --- modular multilevel converters --- primary frequency regulation --- battery energy storage system --- Ornstein–Uhlenbeck stochastic process --- compound poisson stochastic process --- frequency stability --- rotor angle stability --- power system inertia --- converter-interfaced generation --- renewable power generators

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The terrorist attacks on the World Trade Center towers on September 11, 2001, also referred as 9/11, was an iconic event in US history that altered the global and political response to terrorism. The attacks, which involved two planes hitting the twin towers in Lower Manhattan, New York City, resulted in the collapse of the buildings and over 2800 deaths of occupants of the buildings, fire, police and other responders and persons on the street in the vicinity of the collapsing buildings. The destroyed towers and the surrounding buildings have since been replaced but the health effects that resulted from the release of tons of dust, gases and debris as well as the life threat trauma are ongoing, and represent a major health burden among persons directly exposed. Hundreds of scientific publications have documented the physical and mental health effects attributed to the disaster. The current state-of-the-art in understanding the ongoing interactions of physical and mental health, especially PTSD, and the unique mechanisms by which pollutants from the building collapse, have resulted in long term pulmonary dysfunction, course of previously reported conditions, potential emerging conditions (e.g., heart disease and autoimmune diseases), as well as quality of life, functioning and unmet health care needs would be in the purview of this Special Issue on the 9/11 Disaster.

n/a --- asthma outcomes --- health insurance --- mental health --- handgrip strength --- WTC --- cognitive reserve --- disaster epidemiology --- surveillance bias --- cardiac sarcoidosis --- lung function --- lung injury --- treatment utilization --- injury --- Cox regression --- lower Manhattan residents --- chronic sinusitis --- social support --- indoor allergens sensitization --- respiratory function --- FDNY --- asthma control --- sarcoidosis --- asthma --- 9/11 impact --- physical health --- rescue/recovery workers --- chronic disease --- evidence-based treatment --- irritant(s) --- fibrosis --- unmet mental health care needs --- airway hyperreactivity --- asthma quality of life --- Short Form-12 (SF-12) --- WTC-related asthma --- longitudinal analysis --- forced oscillation --- thyroid cancer --- psychotherapy --- cognitive decline --- 9/11 disaster --- severe lung disease --- prevalence --- inflammation --- pulmonary function tests --- World Trade Center disaster --- disaster mental health --- epidemiological studies --- obstructive sleep apnea --- counseling --- sleepiness --- PTSD --- hazard function --- cleaning practices --- air pollution --- aging --- stressful life events --- airway physiology --- screening --- PTSD cluster --- latent class analysis --- retirement --- environmental health --- World Trade Center --- quality improvement --- pulmonary fibrosis --- WTC attack --- dust --- PCL score --- WTC responders --- mini asthma quality of life questionnaire --- biomarkers --- HQoL --- health-related quality of life --- Scadding stage --- 9/11 --- firefighters --- allergen exposure --- metabolic syndrome --- neuropathic symptoms --- small airway disease --- Asian Americans --- asthma morbidity --- PTSD symptom change --- WTC survivors --- trigger(s) --- World Trade Center exposure --- occupational exposure --- peripheral neuropathy --- disaster --- respiratory symptoms --- mental health treatment --- genetics --- mental health service utilization --- comorbid insomnia --- sleep-related quality of life --- World Trade Center attack --- immunoglobulin E --- mental health service use --- income loss --- paresthesia --- World Trade Center (WTC) --- fibrotic sarcoid --- depression --- post-disaster --- mental health conditions --- extrathoracic sarcoidosis --- medical imaging

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Ocean Structures subjected to actions of ocean waves require safety inspection as they protect human environment and everyday lives. Increasing uses of ocean environment have brought active research activities continuously. The newly developed technology of ocean energy even pushed the related needs forward one more step. This Special Issue focuses on Analysis of Interactions between wave structures and ocean waves. Although ocean structures may cover various practical and/or conceptual types, we hope in the years to come, the state-of-the-art applications in wave and structure interactions and/or progress review and future developments could be included. There are fifteen papers published in the Special issue. A brief description includes: Lee et al. [1] presented a concept of a water column type wave power converter. Li et al. [2] considered submerged breakwaters. Lin et al. [3] studied an ocean current turbine system. Thiagarajan and Moreno [4] investigated oscillating heave plates in wind turbines. Chiang et al. [5] proposed an actuator disk model. Tseng et al. [6] investigated Bragg reflections of periodic surface-piercing submerged breakwaters. Lee et al. [7] analyzed caisson structures with a wave power conversion system installed. Yeh et al. [8] reported motion reduction in offshore wind turbines. Wu and Hsiao [9] considered submerged slotted barriers. Tang et al. [10] studied floating platforms with fishnets. Chen et al. [11] calculated mooring drags of underwater floating structures with moorings. Jeong et al. [12] estimated the motion performance of light buoys using ecofriendly and lightweight materials. Zhang et al. [13] considered vibrations of deep-sea risers. On the other hand, Shugan et al. [14] studied the effects of plastic coating on sea surfaces.

deep-sea riser --- top tension --- vortex-induced vibration --- numerical simulation --- experiment --- light buoy --- motion performance in waves --- potential-based simulations --- viscous damping coefficients --- free decay tests --- computational fluid dynamics --- analytic solution --- water waves --- underwater floating structure --- mooring forces --- interaction --- floating platform --- fishnet mesh size --- frequency-domain --- time-domain --- nonlinear waves --- BEM --- solitary wave --- submerged breakwater --- slotted barrier --- PIV --- RANS model --- motion reduction control --- renewable energy --- TLD --- offshore wind turbine --- structural safety --- breakwater design --- wave energy --- wave power converting system --- caisson breakwater application --- eigenfunction matching method --- oblique wave --- Bragg reflection --- step approximation --- surface-piercing structure --- periodic bottom --- surface waves --- wave breaker --- elastic plate --- power prediction --- capacity factor --- actuator disk --- wind farm --- heave plate --- free surface effect --- floating offshore wind turbine --- hydrodynamic coefficients --- added mass --- damping coefficient --- forced oscillation in waves --- Keulegan Carpenter number --- stability --- ocean current power system --- surface type --- buoyance platform --- mooring foundation --- particle image velocimetry --- submerged obstacle --- undulating breakwater --- rectangular breakwater --- vortex energy --- offshore wind power --- template structure system --- oscillating water column --- n/a --- typhoon --- gust --- extreme wind --- aerodynamic load