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The collection of articles discussed above covers various types of discharges and various processes. The discharges presented include, for example, microwave, spark, glow or surface discharges. The characterizations of the sources of these discharges, the parameters of the generated plasmas as well as the applications of these plasmas are discussed. The applications include, for example, the synthesis of nanoparticles or the treatment of skin cancer cells. I hope that the presented articles will be valuable for readers representing the world of science, medicine and technology.

surface discharge --- epoxy resin --- electronegative gas --- high-voltage power equipment --- diffusion welding --- plasma --- glow discharge --- surface treatment --- plasma techniques --- spark discharge --- nanoparticle synthesis --- silver electrodes --- electrodes asymmetry --- vortex break down --- plasma swirl injector --- dielectric barrier discharge --- swirling flow control --- melanoma cell (B16F10) --- plasma cancer therapy --- cold atmospheric plasma (CAP) --- transferred cold atmospheric plasma --- reactive oxygen species (ROS) --- reactive nitrogen species (RNS) --- catalase --- microwave plasma --- dual-frequency plasma --- electron temperature --- electron density --- n/a

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Laser shock processing (LSP) is a continuously developing effective technology used to improve surface and mechanical properties for metallic alloys. LSP is in direct competition with other established technologies, such as shot peening, both in preventive manufacturing treatments and maintenance/repair operations. The level of LSP maturity has increased in recent years and several thematic international conferences have been organized (i.e., the 7th ICLPRP held in Singapore, June 17–22, 2018) to discuss different developments of a number of key aspects. These aspects include: fundamental laser interaction phenomena; material behavior at high deformation rates/under intense shock waves; laser sources and experimental process implementation; induced microstructural/surface/stress effects; mechanical and surface properties with experimental characterization and testing; numerical process simulation; development and validation of applications; comparison of LSP to competing technologies; and novel related processes. All of these aspects have been recursively treated by well-renowned specialists, providing a firm basis for the further development of the technology in its path to industrial penetration. However, the application of LSP (and related technologies) on different types of materials with different applications (such as the always demanding aeronautical/aerospatial field or the energy generation, automotive, and biomedical fields) still requires extensive effort to elucidate and master different critical aspects. Thus, LSP deserves a great research effort as a necessary step prior to its industrial readiness level. The present Special Issue of Metals in the field of “Laser Shock Processing and Related Phenomena” aims, from its initial launching date, to collect (especially for the use of LSP application developers in different target sectors) a number of high-quality and relevant papers representing state-of-the-art technology that is useful to newcomers in realizing its wide and relevant prospects as a key manufacturing technology. Consequently, in an additional and complementary way, papers were presented at the thematic ICLPRP conferences, and a call was made to authors willing to prepare high-quality and relevant papers to the journal, with the confidence that their work would become part of a fundamental reference collection regarding the present state-of-the-art LSP technology. The Special Issue includes two reviews and nine research papers. Each contribution adds to the reference knowledge of LSP technology and covers the practical totality of open issues, which will lead to present-day research at worldwide universities, research centers, and industrial companies.

laser peening --- fatigue --- residual stress --- laser shock waves --- laser peening history --- laser shock peening --- residual stresses --- shot pattern --- energy density --- overlap --- hole drilling --- AA 2024 --- cladded aluminum --- notch --- aluminium alloys --- finite element method --- polymers --- solid confinement --- VISAR measurement --- laser shock processing --- plasma diagnosis --- electron density --- dry laser peening --- femtosecond laser --- shock wave --- laser welding --- 2024 aluminum alloy --- high-velocity impact welding --- laser impact welding --- finite element simulation --- experimental analysis --- microhardness --- resonant fatigue resistance --- roughness --- aluminum alloys --- handheld laser --- nuclear power reactor --- stress corrosion cracking --- anisotropy --- FEM analysis --- Mg AZ31B alloy --- n/a

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The aim of this book is to highlight some recent advances in microwave planar devices. The development of planar technologies still generates great interest because of their many applications in fields as diverse as wireless communications, medical instrumentation, remote sensing, etc. In this book, particular interest has been focused on an electronically controllable phase shifter, wireless sensing, a multiband textile antenna, a MIMO antenna in microstrip technology, a miniaturized spoof plasmonic antipodal Vivaldi antenna, a dual-band balanced bandpass filter, glide-symmetric structures, a transparent multiband antenna for vehicle communications, a multilayer bandpass filter with high selectivity, microwave planar cutoff probes, and a wideband transition from microstrip to ridge empty substrate integrated waveguide.

microwave tunable phase shifters --- 3 dB/90° coupler --- K band --- HD --- MSP --- RF --- SVM --- wireless sensing technology --- antenna design --- constrained optimization problems --- coral reefs optimization algorithm --- meta-heuristics --- antenna --- MIMO --- octagonal --- planar --- UWB --- vivaldi antenna --- miniaturized --- high gain --- surface plasmons --- ultrawideband --- microwave sensor --- differential sensor --- dielectric characterization --- microfluidics --- electrically small resonators --- biosensors --- dual-band differential filter --- common-mode suppression --- magnetic coupling --- multilayer structure --- glide symmetry --- higher symmetries --- Maxwell fish-eye lens --- metasurface --- periodic structures --- printed circuit board --- coplanar waveguides --- vehicular networks --- IEEE 802.11p --- indium-tin oxide (ITO) --- transparent antenna --- bandpass filter --- discriminating coupling --- high selectivity --- source-load coupling --- plasma diagnostics --- electron density measurement --- planar microwave cutoff probe --- bar-type cutoff probe --- ring-type cutoff probe --- computational characterization --- substrate integrated waveguide --- ridge waveguide --- tapering structure --- broadband --- microwave devices --- n/a

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This collection of articles focuses on different aspects of the study of organic conductors. Recent progress in both theoretical and experimental studies is covered in this Special Issue. Papers on a wide variety of studies are categorized into representative topics of chemistry and physics. Besides classical studies on the crystalline organic conductors, applied studies on semiconducting thin films and a number of new topics shared with inorganic materials are also discussed.

organic π-radical --- molecular conductor --- phthalocyanine --- three-dimensional network --- three-dimensional electronic system --- organic conductors --- bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) --- bis(ethylenediseleno)tetrathiafulvalene (BEST) --- bis(ethylenedithio)tetraselenafulvalene (BETS) --- electrical resistivity --- magnetic susceptibility --- X-ray analysis --- charge-ordered state --- quantum chemical calculations --- Madelung energy --- magnetic property --- reversible transformation --- spin ladder --- nodal line semimetal --- single-component molecular conductor --- conductivity --- DOS --- tight-binding model --- interacting electrons in one dimension --- electronic and lattice instabilities --- renormalization group method --- X-ray diffraction --- single crystal --- electron density --- molecular orbital --- single-component molecular conductors --- extended-TTF dithiolate ligands --- gold dithiolate complexes --- (BETS)2Fe1−xGaxCl4 --- π-d interaction --- NMR --- charge glass --- heat capacity --- electric current --- electric voltage --- Boson peak --- chirality --- tetrathiafulvalene --- crystal structures --- band structure calculations --- hydrogen bonding --- charge-transfer salts --- (TMTTF)2X --- deuteration --- anions --- charge transport --- tunnel junction --- MOCVD --- quantum well --- co-doping --- solar cells --- (TMTSF)8(I3)5 --- (TMTSF)5(I3)2 --- (TMTSF)4(I3)4·THF --- organic conductor --- crystal structure --- high pressure --- DFT --- MP2 --- organic superconductors --- Beechgard salts --- Maxwell-Garnett approximation --- high-Tc --- pressure effect --- Dirac electron system --- resistivity --- magnetoresistance --- synchrotron X-ray diffraction --- band calculation --- correlated electron materials --- layered organic conductor --- unconventional superconductivity --- vortex dynamics --- d-wave pairing symmetry --- superconducting gap structure --- magnetic field --- flux-flow resistivity --- charge-ordered insulator --- electric double layer transistor --- organic field-effect transistor --- π–d system --- Mott insulator --- strongly correlated electron system --- multiferroic --- dielectric --- photoconductor --- organic semiconductors --- molecular orbitals --- pyroelectricity --- temperature modulation --- molecular ferroelectrics --- radiative temperature control --- thermal diffusion model --- lithium niobate --- first-principles calculation --- density-functional theory --- charge ordering --- hybrid functional --- electronic structure --- nickel–dithiolene complex --- cycloalkane substituent --- crystalline organic charge-transfer complexes --- disordered systems --- overlap integrals --- extended Hückel approximation --- Dirac electrons --- zero-gap semiconductors --- merging of Dirac cones --- n/a --- π-d system --- nickel-dithiolene complex --- extended Hückel approximation