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Mountainous regions occupy a significant fraction of the Earth’s continents and are characterized by specific meteorological phenomena operating on a wide range of scales. Being a home to large human populations, the impact of mountains on weather and hydrology has significant practical consequences. Mountains modulate the climate and create micro-climates, induce different types of thermally and dynamically driven circulations, generate atmospheric waves of various scales (known as mountain waves), and affect the boundary layer characteristics and the dispersion of pollutants. At the local scale, strong downslope winds linked with mountain waves (such as the Foehn and Bora) can cause severe damage. Mountain wave breaking in the high atmosphere is a source of Clear Air Turbulence, and lee wave rotors are a major near-surface aviation hazard. Mountains also act to block strongly-stratified air layers, leading to the formation of valley cold-air pools (with implications for road safety, pollution, crop damage, etc.) and gap flows. Presently, neither the fine-scale structure of orographic precipitation nor the initiation of deep convection by mountainous terrain can be resolved adequately by regional-to global-scale models, requiring appropriate downscaling or parameterization. Additionally, the shortest mountain waves need to be parameterized in global weather and climate prediction models, because they exert a drag on the atmosphere. This drag not only decelerates the global atmospheric circulation, but also affects temperatures in the polar stratosphere, which control ozone depletion. It is likely that both mountain wave drag and orographic precipitation lead to non-trivial feedbacks in climate change scenarios. Measurement campaigns such as MAP, T-REX, Materhorn, COLPEX and i-Box provided a wealth of mountain meteorology field data, which is only starting to be explored. Recent advances in computing power allow numerical simulations of unprecedented resolution, e.g. LES modelling of rotors, mountain wave turbulence, and boundary layers in mountainous regions. This will lead to important advances in understanding these phenomena, as well as mixing and pollutant dispersion over complex terrain, or the onset and breakdown of cold-air pools. On the other hand, recent analyses of global circulation biases point towards missing drag, especially in the southern hemisphere, which may be due to processes currently neglected in parameterizations. A better understanding of flow over orography is also crucial for a better management of wind power and a more effective use of data assimilation over complex terrain. This Research Topic includes contributions that aim to shed light on a number of these issues, using theory, numerical modelling, field measurements, and laboratory experiments.
Turbulent fluxes --- Downslope winds --- Large eddy simulation --- Sub-mesoscale circulations --- orographic precipitation --- Thermally-driven flows --- Horizontal inhomogeneity --- Cold air pools --- Hydraulic jumps --- mountain waves
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This thematic issue presents 11 scientific articles that are extremely useful for understanding the processes and phenomena of the interacting geospheres of the Earth. These processes have an important impact on the biosphere and many human activities. The results of scientific research presented in this book are fully united by the common theme "investigation of the fundamental foundations of the emergence, development, transformation, and interaction of hydroacoustic, hydrophysical and geophysical fields in the World Ocean." The book is recommended to a wide range of readers, as well as to specialists in the field of hydroacoustics, oceanology, and geophysics.
gravitational waves --- pressure variations --- period variation --- laser meter of hydrosphere pressure variations --- infragravity waves --- gravity wind waves --- laser strainmeter --- typhoon --- mesoscale eddy --- parabolic equation --- normal mode --- mesoscale vortex --- acoustic propagation --- AIPOcean --- OW method --- COMSOL software --- sea surface --- wave spectra --- satellite imagery processing --- aerospace monitoring --- sea waves --- retrieving operator --- Scholte wave --- theoretical dispersion curve --- stiffness matrices --- layered media --- wind waves --- progressive waves --- standing waves --- primary microseisms --- secondary microseisms --- wave dynamics --- wave transformation --- swell --- tides --- seiches --- remote probing --- space monitoring --- nonlinearity --- modulation --- oceanic front --- ray theory --- horizontal refraction --- coastal video monitoring --- streaming video --- image and video processing --- real-time mode --- subpixel resolution --- underwater currents --- microseisms --- coastal water areas --- red tide --- harmful algal bloom --- sea surface height --- sea surface temperature --- chlorophyll-a --- biogenic slicks --- river runoff --- Kamchatka --- earthquake --- tsunami --- deformation jump --- sine-Gordon equation --- kink --- anti-kink --- underwater landslide --- n/a
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The development of porous materials has attracted the attention of the research community for years. Porosity characteristics have specific impacts on the material properties and materials that are applied in many areas, such as pollutant removal, CO2 capture, energy storage, catalytic oxidation and reduction processes, the conversion of biomass to biofuels, and drug delivery. Examples of porous materials are activated carbons, clays, and zeolites. The aim of this book is to collect the recent advances and progress regarding porous materials and their applications in the environmental area.
spherical seeds --- spherical activated carbons --- activation --- microporosity --- mechanical properties --- diatomite --- zeolite X --- hydrothermal method --- calcium ion exchange capacity --- clay minerals particles --- orientational anisotropy --- granular systems --- disk packing --- X-Ray microtomography --- mesoscale simulation --- water produced --- adsorbent materials --- composite --- AlFe-pillared clay --- CrCeOx --- chlorobenzene --- catalytic combustion --- temperature-programmed reaction --- lignite --- porous structure --- carbon dioxide --- pressure --- CuCl/AC adsorbent --- CO adsorption --- monolayer dispersion --- isosteric heat --- adsorption isotherms --- Fischer–Tropsch --- supported iron oxide --- supported cobalt oxide --- reducibility --- dispersion --- biosorption --- weed --- methylene blue dye --- natural biosorbents --- adsorption kinetics
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Energy storage currently plays an important role in the electricity systems. Innovative energy storage solutions will play an important role in ensuring the integration of renewable energy sources into the electrical grids in the European Union. Pumped storage hydropower systems are the most mature technology of energy storage and account for over 90% of installed energy storage capacity worldwide. However, PSH technology is constrained by topography and land availability in flat areas. In addition, PSH plants are controversial due to their impacts on landscape, land use and the environment. Conversely, underground energy storage systems may be an interesting alternative to increase the energy storage capacity with low environmental impacts. To help address and resolve these types of questions, this book is comprised of eleven chapters that explore new ways of energy storage reducing the environmental impacts caused by the installation of conventional energy storage systems, as well as to increase the energy storage capacity and promote the use of disused underground space, such as abandoned mines and quarries. The chapters included in this book cover a wide spectrum of issues related to underground energy storage systems. Advances in underground pumped storage hydropower, compressed air energy storage and hydrogen energy storage systems are presented. Finally, we would like to thank both the MDPI publishing and editorial staff for their excellent work and support, as well as the authors who collaborated with your interesting research works.
energy storage --- underground pumped storage --- economic feasibility --- ancillary services --- day-ahead market --- underground space --- mining structures --- underground reservoir --- empirical analysis --- numerical modelling --- hydropower plants --- hydrogen --- underground storage --- leakage --- monitoring --- protocol --- helium --- aquifer --- renewable energy --- hydropower --- mine --- groundwater --- environmental impacts --- efficiency --- wind energy --- photovoltaics --- wind curtailment --- mesoscale atmospheric model --- hydro-pumped storage --- abandoned mines --- underground reservoirs --- CAES --- analytical modelling --- sealing layer --- environmental impact --- hydrogen storage --- sealing liners --- Liner Rock Caverns --- epoxy resin --- hydrogen permeability --- exergy --- salt caverns --- pumped storage hydropower --- energy storage system --- quarry --- open pit --- hydrochemistry --- n/a
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Oceanic internal waves (IWs) at frequencies from local inertial (e.g., near-inertial internal waves) to buoyancy frequencies (nonlinear internal waves or internal solitary waves), sometimes including diurnal and semidiurnal tidal frequencies, play an important role in redistributing heat, momentum, materials, and energy via turbulent mixing. IWs are found ubiquitously in many seas, including East Asian marginal seas (Indonesian Seas, South China Sea, East China Sea, Yellow Sea, and East Sea or Japan Sea), significantly affecting underwater acoustics, coastal and offshore engineering, submarine navigation, biological productivity, and the local and global climate. Despite decades of study on the IWs in some regions, our understanding of the IWs in the East Asian marginal seas is still in a primitive state and the mechanisms underlying every stage (generation, propagation, evolution, and dissipation) of IWs are not always clear. This Special Issue includes papers related to all fields of both low- and high-frequency IW studies in the specified region, including remote sensing, in situ observations, theories, and numerical models.
near-inertial waves --- typhoon Megi --- South China Sea --- hybrid coordinate ocean model reanalysis results --- Luzon Strait --- baroclinic tides --- stratification variability --- MITgcm --- nonlinear internal wave --- propagating speed --- propagating direction --- underway observation --- moored observation --- East China Sea --- internal solitary wave --- shipboard observation --- extreme current velocity --- wave breaking --- trapped core --- near-inertial internal waves --- nonseasonal variability --- mesoscale flow field --- relative vorticity --- Okubo-Weiss parameter --- subsurface mooring --- southwestern East Sea --- Japan Sea --- internal waves --- Hainan Island --- KRI nanggala-402 submarine wreck --- Lombok Strait --- Bali Sea --- internal solitary waves --- remote sensing images --- underwater noise --- flow noise --- vortex-induced vibration --- the South China Sea --- n/a
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Although air pollution is usually linked with human activities, natural processes may also lead to major concentrations of hazardous substances in the low atmosphere. Pollutant levels may be reduced when emissions can be controlled. However, the impact of meteorological variables on the concentrations measured may be noticeable, and these variables cannot be controlled. This book is devoted to the influence of meteorological processes on the pollutant concentrations recorded in the low atmosphere. Measurements, cycles, statistical procedures, as well as specific variables such as the synoptic pattern, temperature inversion, or the calculation of back-trajectories, are considered in the studies included in this book to highlight the relationship between air pollution and meteorological variables. In addition, the state of the art of this subject following meteorological scales, from micro to macro-scale, is presented. Consequently, this book focuses on applied science and seeks to further current knowledge of what contribution meteorological processes make to the concentrations measured in order to achieve greater control over air pollution.
air pollution --- synoptic situation pattern --- meteorological variables --- threshold values --- air quality forecast --- modelling --- pollution episodes --- national holiday --- COVID-19 --- particulate matter --- natural ventilation --- indoor air quality --- regional variation --- nitrogen dioxide --- in situ urban concentrations --- meteorological measurements --- NO2 variation --- partial correlation --- gross alpha activity --- northern Iberian Peninsula --- radon --- airflow patterns --- surface winds --- atmospheric boundary layer --- weather types --- Gaussian plume model --- low-level jet --- recirculation --- microscale --- macroscale --- mesoscale --- source apportionment --- cluster analysis --- health risks --- residential wood burning --- sustainable urban development --- urban haze --- temperature inversion --- Obukhov length --- HYSPLIT --- biomass burning --- cold surge, emission --- BaP --- HPLC --- carcinogenic --- diagnostic ratio
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The air pollution problem inevitably accompanies our human activities. Severe air pollution situations have been reported, especially in emerging countries, and satisfying the air quality standards fully remains an underlying issue. Today, modeling research is one of the more valuable approaches to understanding the behavior of air pollutants, and is useful for regulation-, policy- and decision-making. Such modeling applications range, with regard to horizontal grid resolution, from a few km (local) to hundreds of km (regional), to thousands of km (global). To foster our current scientific knowledge on modeling potentialities and limitations, scientific research related to multi-scale air pollution modeling is collected in this book.
Urban pollution --- Street canyon --- Nitrate aerosol --- CFD --- Air quality --- open burning --- biomass burning --- sugarcane crops --- environmental assessment --- air quality modeling --- chemical reaction model --- urban canyon --- radiation --- mesoscale models --- reactive pollutants --- Community Multiscale Air Quality (CMAQ) --- East Asia --- Tokyo --- SO42– --- stabilized Criegee intermediates (SCI) --- wildfire plume rise --- smoke modeling --- large eddy simulation --- emissions dispersion --- WRF-SFIRE --- RxCADRE --- RePLaT-Chaos --- large-scale atmospheric advection --- chaotic advection --- stretching rate --- escape rate --- education --- CMAQ --- PM10 --- atmospheric reanalysis --- PM2.5 --- PM2.5 components --- three-dimensional chemical transport model --- model inter-comparison --- urban scale --- secondary particles --- WRF-Chem --- visibility --- eastern China --- neural network algorithm --- IMPROVE --- n/a --- SO42 --- -stabilized Criegee intermediates (SCI)
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This Special Issue “Atmospheric Conditions for Wind Energy Applications” hosts papers on aspects of remote sensing for atmospheric conditions for wind energy applications. Wind lidar technology is presented from a theoretical view on the coherent focused Doppler lidar principles. Furthermore, wind lidar for applied use for wind turbine control, wind farm wake, and gust characterizations is presented, as well as methods to reduce uncertainty when using lidar in complex terrain. Wind lidar observations are used to validate numerical model results. Wind Doppler lidar mounted on aircraft used for observing winds in hurricane conditions and Doppler radar on the ground used for very short-term wind forecasting are presented. For the offshore environment, floating lidar data processing is presented as well as an experiment with wind-profiling lidar on a ferry for model validation. Assessments of wind resources in the coastal zone using wind-profiling lidar and global wind maps using satellite data are presented..
complex flow --- Floating Lidar System (FLS) --- mesoscale --- wind energy resources --- variational analysis --- wind turbine --- wind sensing --- wind energy --- wind gusts --- wake --- wind structure --- complex terrain --- global ocean --- remote sensing forecasting --- detached eddy simulation --- five-minute ahead wind power forecasting --- tropical cyclones --- fetch effect --- aerosol --- vertical Light Detection and Ranging --- range gate length --- resource assessment --- field experiments --- remote sensing --- optical flow --- turbulence --- atmospheric boundary layer --- Doppler Wind Lidar --- offshore --- empirical equation --- Lidar --- WindSAT --- coastal wind measurement --- offshore wind speed forecasting --- Doppler wind lidar --- Doppler --- wind --- wind lidar --- cross-correlation --- QuikSCAT --- wind resource assessment --- detecting and tracking --- single-particle --- gust prediction --- NWP model --- velocity-azimuth-display algorithm --- lidar-assisted control (LAC) --- Doppler lidar --- motion estimation --- power performance testing --- lidar --- large-eddy simulations --- wind farm --- coherent Doppler lidar --- wake modeling --- probabilistic forecasting --- control --- NeoWins --- wind turbine controls --- impact prediction --- wind turbine wake --- Hazaki Oceanographical Research Station --- VAD --- virtual lidar --- Doppler radar --- IEA Wind Task 32 --- ASCAT --- wind atlas --- turbulence intensity
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Multifunctional hybrid materials based on polymers have already displayed excellent commitment in addressing and presenting solutions to existing demands in priority areas such as the environment, human health, and energy. These hybrid materials can lead to unique superior multifunction materials with a broad range of envisaged applications. However, their design, performance, and practical applications are still challenging. Thus, it is highly advantageous to provide a breakthrough in state-of-the-art manufacturing and scale-up technology to design and synthesize advanced multifunctional hybrid materials based on polymers with improved performance.The main objective of this interdisciplinary book is to bring together, at an international level, high-quality elegant collection of reviews and original research articles dealing with polymeric hybrid materials within different areas such as the following:- Biomaterials chemistry, physics, engineering, and processing;- Polymer chemistry, physics and engineering;- Organic chemistry;- Composites science;- Colloidal chemistry and physics;- Porous nanomaterials science;- Energy storage; and- Automotive and aerospace manufacturing.
HPMC --- galantamine hydrobromide (GH) --- pectin --- hydrogel --- methylene bisacrylamide --- dementia --- PLLA --- chitosan --- basil oil --- active packaging --- films --- barrier properties --- antioxidant properties --- nanodielectrics --- crosslinked polyethylene --- auxiliary crosslinker --- electrical tree --- dielectric breakdown strength --- ionic liquid --- nanofiller --- polymer nanocomposite --- thermal --- mechanical --- chemical --- concrete --- basalt fiber --- epoxy resin --- alginate --- raised temperature --- compressive strength --- self-compacting concrete --- self-consolidating concrete --- waste alumina --- nano alumina --- nanoparticles --- MWCNTs --- horizontal axis wind turbine --- finite element analysis --- Ansys --- lung cancer --- toxicity --- surface modification --- hybrid nanocarriers --- dissipative particle dynamics --- Nafion --- mesoscale morphology --- poly(1-vinyl-1,2,4-triazole) --- poly(vinylphosphonic acid) --- Friction Riveting --- metal-polymer hybrid joints --- friction-based multi-material connections --- anchoring FE modelling --- rivet failure modes --- carbon nanotube --- controlled residence time --- melt mixing --- polymer composites --- percolation network --- n/a --- silica nanoparticles --- Pickering emulsion polymerization --- microspheres --- hybrid monoliths
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This book illustrates the exciting possibilities being opened up by X-ray computed tomography (CT) to follow the behavior of materials under conditions as close as possible to those encountered during their manufacture or in operation.The scientific chapters selected for this book describe results obtained using synchrotron or laboratory devices during in situ or ex situ experiments. They characterize microstructures across length scales ranging from tens of nanometers to a few tens of micrometers.In this collection, X-ray CT shines a light on the mechanical properties of engineering materials, such as aluminum or magnesium alloys, stainless steel, aluminum, polymer composites, or ceramic foam. In these experiments, X-ray CT is able to image and quantify the damage occurring during tensile, compression, indentation, or fatigue tests.Of course, X-ray CT can illuminate the structure and behavior of natural materials too. Here it is applied to bone or natural snow to study their mechanical behavior, as well as materials from the agri-food sector. Its versatility is exemplified by analyses of topics as diverse as the removal of olive oil from kitchen sponges by squeezing and rinsing, to the effect of temperature changes on the structure of ice cream.
in-situ X-ray computed tomography --- thermal-mechanical loading --- polymer bonded explosives --- mesoscale characterization --- structure evolution --- particle morphology --- heat treatment --- aluminum cast alloy --- mechanical properties --- Ostwald ripening --- nanotomography --- phase-contrast imaging --- tomographic reconstruction --- dynamic tomography --- motion compensation --- projection-based digital volume correlation --- X-ray μCT --- in-situ experiments --- flow cell --- alkaline manganese batteries --- X-ray tomography --- in operando --- in situ --- zinc powder --- laser powder bed fusion --- additive manufacturing --- in-situ imaging --- Ti6Al4V --- lattice structures --- mechanics --- corrosion --- biomaterial --- battery --- aluminum foams --- intermetallics --- finite element analysis --- damage --- polycrystal plasticity --- X-ray diffraction imaging --- topotomography --- in situ experiment --- finite element simulation --- lattice curvature --- rocking curve --- ice cream --- microstructure --- tomography --- ice crystals --- coarsening --- soft solids --- bone --- X-ray radiation --- tissue damage --- SR-microCT --- digital volume correlation --- temperature control --- electrochemical cell design --- batteries --- helical CT --- contrast agent --- high cycle fatigue (HCF) --- fibre break --- fibre tows --- Freeze Foaming --- in situ computed tomography --- non-destructive testing --- bioceramics --- aging --- crack initiation and propagation --- damage modes --- osteoporosis --- osteogenesis imperfecta --- porosity --- bone matrix quality --- micro-CT --- snow grains --- snow microstructure --- snow properties --- pore morphology --- voids --- fiber-reinforced concrete --- CT scan technology --- DIP software --- X-ray tomography (X-ray CT) --- 3D image analysis --- hydrogen embrittlement --- stainless steel
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