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The main focus of this Special Issue of Water is the state-of-the-art and recent research on turbulence and flow–sediment interactions in open-channel flows. Our knowledge of river hydraulics is deepening, thanks to both laboratory/field experiments related to the characteristics of turbulence and their link to erosion, transport, deposition, and local scouring phenomena. Collaboration among engineers, physicists, and other experts is increasing and furnishing new inter-/multidisciplinary perspectives to the research of river hydraulics and fluid mechanics. At the same time, the development of both sophisticated laboratory instrumentation and computing skills is giving rise to excellent experimental–numerical comparative studies. Thus, this Special Issue, with ten papers by researchers from many institutions around the world, aims at offering a modern panoramic view on all the above aspects to the vast audience of river researchers.

Technology: general issues --- wavelet coherency --- Taylor’s frozen turbulence hypothesis --- scale --- hairpin vortex packet --- open channel flow --- bridge pier --- horseshoe vortex --- Physical hydraulic modeling --- quadrant analysis --- Scour and Velocity field --- hydraulics --- turbulent flow --- wall-wake flow --- dunal bedform --- horizontal cylinder --- turbulence structures --- scour --- velocity field --- turbulence --- equilibrium scour depth --- new scaling of scour depth --- ejections --- turbulence interactions --- gravel beds --- sediment transport --- surface and subsurface flows --- river hydrodynamics --- ADCP --- bedforms morphology --- river confluence --- Amazon River --- Yeongsan estuary --- freshwater discharge --- two-layer circulation --- Reynolds stress --- bottom turbulence --- suspended sediment concentration --- sediment kinematics --- entrainment --- disentrainment --- anisotropy --- rigid vegetation --- sediments --- local scouring --- erosion --- transport --- deposition --- open-channel flows --- laboratory experiments

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The main focus of this Special Issue of Water is the state-of-the-art and recent research on turbulence and flow–sediment interactions in open-channel flows. Our knowledge of river hydraulics is deepening, thanks to both laboratory/field experiments related to the characteristics of turbulence and their link to erosion, transport, deposition, and local scouring phenomena. Collaboration among engineers, physicists, and other experts is increasing and furnishing new inter-/multidisciplinary perspectives to the research of river hydraulics and fluid mechanics. At the same time, the development of both sophisticated laboratory instrumentation and computing skills is giving rise to excellent experimental–numerical comparative studies. Thus, this Special Issue, with ten papers by researchers from many institutions around the world, aims at offering a modern panoramic view on all the above aspects to the vast audience of river researchers.

Technology: general issues --- wavelet coherency --- Taylor’s frozen turbulence hypothesis --- scale --- hairpin vortex packet --- open channel flow --- bridge pier --- horseshoe vortex --- Physical hydraulic modeling --- quadrant analysis --- Scour and Velocity field --- hydraulics --- turbulent flow --- wall-wake flow --- dunal bedform --- horizontal cylinder --- turbulence structures --- scour --- velocity field --- turbulence --- equilibrium scour depth --- new scaling of scour depth --- ejections --- turbulence interactions --- gravel beds --- sediment transport --- surface and subsurface flows --- river hydrodynamics --- ADCP --- bedforms morphology --- river confluence --- Amazon River --- Yeongsan estuary --- freshwater discharge --- two-layer circulation --- Reynolds stress --- bottom turbulence --- suspended sediment concentration --- sediment kinematics --- entrainment --- disentrainment --- anisotropy --- rigid vegetation --- sediments --- local scouring --- erosion --- transport --- deposition --- open-channel flows --- laboratory experiments

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Positrons can be used to study metallic defects. Positron annihilation experiments have been carried out to identify the defects in complex oxides. Positrons have also been used to study the Bose–Einstein condensation (BEC). Ps-BEC can be used to measure antigravity using atomic interferometers. This Special Issue hopes to bring awareness of the various aspects of positron interactions to the larger physics communities. We invite authors to submit articles from all areas of physics.

photoionization --- photoabsorption --- photodetachment --- positronium negative ion --- Feshbach and shape resonance states --- correlated exponential wave functions --- complex-coordinate rotation method --- positron-impact excitation --- variational polarized orbital method --- Born approximation --- Coulomb-dipole theory --- positron vs. electron impact ionization --- antihydrogen --- radiative attachment --- antihydrogen ion --- analytical --- hydrogen ion --- solar flares --- coronal mass ejections --- shocks --- positrons --- positronium --- positron annihilation --- pion decay --- autoionization states --- doubly excited states --- Feshbach states --- resonances --- shape resonances --- electron-impact ionization --- hydrogen --- positron-impact ionization --- velocity field --- vortices --- Electron-Positron Scatterings --- atoms and molecules --- cross sections and spin polarization --- theoretical approaches --- Stark effects --- Gailitis resonance --- LENR --- muon catalyzed fusion --- free–free transitions --- opacity

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Motivated by the theory of turbulence in fluids, the physicist and chemist Lars Onsager conjectured in 1949 that weak solutions to the incompressible Euler equations might fail to conserve energy if their spatial regularity was below 1/3-Hölder. In this book, Philip Isett uses the method of convex integration to achieve the best-known results regarding nonuniqueness of solutions and Onsager's conjecture. Focusing on the intuition behind the method, the ideas introduced now play a pivotal role in the ongoing study of weak solutions to fluid dynamics equations.The construction itself-an intricate algorithm with hidden symmetries-mixes together transport equations, algebra, the method of nonstationary phase, underdetermined partial differential equations (PDEs), and specially designed high-frequency waves built using nonlinear phase functions. The powerful "Main Lemma"-used here to construct nonzero solutions with compact support in time and to prove nonuniqueness of solutions to the initial value problem-has been extended to a broad range of applications that are surveyed in the appendix. Appropriate for students and researchers studying nonlinear PDEs, this book aims to be as robust as possible and pinpoints the main difficulties that presently stand in the way of a full solution to Onsager's conjecture.

Fluid dynamics --- Mathematics. --- Beltrami flows. --- Einstein summation convention. --- Euler equations. --- Euler flow. --- Euler-Reynolds equations. --- Euler-Reynolds system. --- Galilean invariance. --- Galilean transformation. --- HighЈigh Interference term. --- HighЈigh term. --- HighЌow Interaction term. --- Hlder norm. --- Hlder regularity. --- Lars Onsager. --- Main Lemma. --- Main Theorem. --- Mollification term. --- Newton's law. --- Noether's theorem. --- Onsager's conjecture. --- Reynolds stres. --- Reynolds stress. --- Stress equation. --- Stress term. --- Transport equation. --- Transport term. --- Transport-Elliptic equation. --- abstract index notation. --- algebra. --- amplitude. --- coarse scale flow. --- coarse scale velocity. --- coefficient. --- commutator estimate. --- commutator term. --- commutator. --- conservation of momentum. --- continuous solution. --- contravariant tensor. --- convergence. --- convex integration. --- correction term. --- correction. --- covariant tensor. --- dimensional analysis. --- divergence equation. --- divergence free vector field. --- divergence operator. --- energy approximation. --- energy function. --- energy increment. --- energy regularity. --- energy variation. --- energy. --- error term. --- error. --- finite time interval. --- first material derivative. --- fluid dynamics. --- frequencies. --- frequency energy levels. --- h-principle. --- integral. --- lifespan parameter. --- lower indices. --- material derivative. --- mollification. --- mollifier. --- moment vanishing condition. --- momentum. --- multi-index. --- non-negative function. --- nonzero solution. --- optimal regularity. --- oscillatory factor. --- oscillatory term. --- parameters. --- parametrix expansion. --- parametrix. --- phase direction. --- phase function. --- phase gradient. --- pressure correction. --- pressure. --- regularity. --- relative acceleration. --- relative velocity. --- scaling symmetry. --- second material derivative. --- smooth function. --- smooth stress tensor. --- smooth vector field. --- spatial derivative. --- stress. --- tensor. --- theorem. --- time cutoff function. --- time derivative. --- transport derivative. --- transport equations. --- transport estimate. --- transport. --- upper indices. --- vector amplitude. --- velocity correction. --- velocity field. --- velocity. --- weak limit. --- weak solution.

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This book presents collective works published in the recent Special Issue (SI) entitled "Aero/Hydrodynamics and Symmetry". These works address the existence of symmetry and its breakdown in aero-/hydro-dynamics and their related applications. The presented problems are complex nonlinear, non-Newtonian fluid flow problems that are (in some cases) coupled with heat transfer, phase change, nanofluidic, and magnetohydrodynamics phenomena. The applications vary and range from polymer chain transfer in micro-channel to the evaluation of vertical axis wind turbines, as well as autonomous underwater hovering vehicles. Recent advances in numerical, theoretical, and experimental methodologies, as well as finding new physics, new methodological developments, and their limitations are presented within the scope of the current book. Among others, in the presented works, special attention is paid to validation and improving the accuracy of the presented methodologies. This book brings together a collection of inter-/multi-disciplinary works applied to many engineering applications in a coherent manner.

Savonius vertical axis wind turbine --- horizontal overlap ratio --- vertical overlap ratio --- torque coefficient --- power coefficient --- Advection–diffusion --- fractional derivative --- concentrated source --- integral transform --- Burgers’ fluid --- velocity field --- shear stress --- Laplace transform --- modified Bessel function --- Stehfest’s algorithm --- MATHCAD --- electroosmotic flow --- power law fluid --- nanoparticles --- MHD --- entropy generation --- convergence analysis --- residual error --- autonomous underwater vehicle (AUV) --- airborne-launched AUV --- autonomous underwater hovering vehicle (AUH) --- water entry impact force --- computational fluid dynamics (CFD) --- two-phase flow --- Autonomous Underwater Vehicle (AUV) --- Autonomous Underwater Hovering Vehicle (AUH) --- hydrodynamic interaction --- response amplitude operator (RAO) --- wave effects --- symmetric flying wing --- plasma flow control --- energy --- stall --- dimensionless frequency --- particle image velocimetry --- SA–NaAlg fluid --- porosity --- fractional model --- Atangana–Baleanu derivative --- large eddy simulation --- subgrid scale model --- diffuser --- dynamic one equation model --- Vreman model --- separation --- heat conduction --- non-fourier --- solution structure theorems --- superposition approach --- Buongiorno model --- unsteady flow --- nanoliquid --- special third-grade liquid --- non-linear thermal radiation --- magneto hydro-dynamics (MHD) --- dissipative particle dynamics (DPD) --- Hartmann number (Ha-value) --- harmony bond coefficient or spring constant (K)