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Since the discovery of the luminescent properties of porous Si by L. Canham in 1990, the anodization process has attracted enormous interest for the fabrication of porous semiconductors. To date, this technique has been widely used to design new materials with advanced physico-chemical properties for many applications in optics, microelectronics, energy, biology and medicine.
semiconductor --- porous material --- microfabrication --- nanomaterials --- Nanotechnologies
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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact
zeolites --- porous-material --- bi-functional catalysts --- environmental --- green fuel
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Noise generated by aircraft continues to be a pressing issue for society, as an increasing number of people residing in close proximity to airports make noise complaints on a regular basis. The reduction in aircraft noise is therefore a very important engineering task that would require the careful identification of different acoustic sources around the airplane, the understanding of noise source behavior and ranking along flight trajectories, sophisticated measurement techniques, and robust and accurate numerical tools aimed at predicting the generation of noise, the propagation through the atmosphere, and the resulting noise impact along approach and departure flights. For an overall assessment of the situation, it has to be assessed along entire flight trajectories rather than assessing limited operating conditions only. Furthermore, it is highly recommended to apply multiple acoustic metrics and account for different and widespread observer locations along the flight. Only then can the overall situation be adequately captured. Obviously, this is a highly multidisciplinary effort and no single discipline can address this problem. This reprint includes selected research studies with that multidisciplinary context that deal with numerical or experimental investigations that range from the investigation of specific noise sources to the assessment of noise generated by the overall aircraft in operation. Both basic and applied research studies involving the modelling and simulation of aircraft noise are included.
aircraft noise simulation --- conceptual aircraft design --- noise certification --- ICAO Annex 16 --- PANAM --- RCE --- green aviation --- airport operations --- aircraft noise impact --- noise prediction method --- large eddy simulations --- jet noise --- jet–surface interaction --- aircraft noise --- simulation --- sonAIR --- FLULA2 --- AEDT --- validation with measurements --- low-noise aircraft design --- center of excellence --- Sustainable and Energy-Efficient Aviation (SE2A) --- forward swept wing --- PrADO --- aircraft noise prediction --- supersonic transport aircraft --- NASA STCA --- FAA NPRM --- LTO noise --- SuperSonic Transport (SST) --- aircraft conceptual design --- aeroacoustics --- rotor-stator interaction noise --- porous material --- turbulence modeling --- synthetic turbulence --- CFD --- supersonic aircraft --- ICAO Annex 16 Vol.1 --- multiobjective optimisation --- community noise --- air quality --- sound quality --- noise abatement procedures --- spectral matching
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Materials processing is the first, and a key, step in proper utilization of the composition of a given material and to realize the microstructural features that are intended to attain desired property levels for a given application. Both primary and secondary processing methods are equally important in tailoring the end properties of materials. In view of the crucial importance of the processing of materials, this Special Issue is intending to cover all innovative aspects of primary processing (solid phase, liquid phase, two phase, 3D printing, rapid solidification, etc.) and secondary processing (such as variations in extrusion, forging, rolling, equichannel angular extrusion, etc.) of materials (polymers/metal/ceramic-based, including their composites). Desirable attributes expected for submission will be processing–microstructure–property interrelations.
Materials science --- electrical discharge machining --- vibroacoustic emission --- adaptive control --- monitoring --- discharge gap --- erosion products --- silver nanoparticles --- mulberry leaves extract --- CO2-assisted polymer compression --- numbering-up --- high productivity --- CO2 --- polymer --- porous material --- process improvement --- 1D magnetic photonic crystals --- multilayer film modeling --- modeling of Faraday rotation spectra --- MPC optimization --- exhaustive computation --- materials characterization --- nanoceramics --- coatings --- auxiliary electrode --- electrical conductivity --- oxides --- nitrides --- carbon particles --- oil medium --- additive technologies --- additive manufacturing --- FFF --- 3D printing --- nylon --- cryogenic machining --- review --- liquid nitrogen --- liquid carbon dioxide --- thermomechanical processing --- bobbin friction stir welding --- atomic force microscopy --- AA6082-T6 aluminium alloy --- dynamic recrystallization --- precipitation --- macroscopic self-standing architectures --- Ni-doped MnO2 --- Co-doped MnO2 --- propane oxidation --- mechanical properties --- 3D-printing --- compensation --- accuracy --- precision --- adsorption --- hydrotalcite --- thiophene/dibenzothiophene --- n-pentane --- desulfurization --- structural ceramic --- oxide ceramic --- EDM --- ZrO2 --- Al2O3 --- electrode --- thin films --- white layer --- electro physics --- chemical reactions --- sublimation --- friction stir welding --- WC --- AA1100 aluminium plate --- weld contamination --- tunnel void --- kissing bond --- erosion --- tool wear --- ZnNix --- explosive deposition --- n/a
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This Special Issue collects ten articles related to the broadly understood physical properties of intermetallic compounds. Differential thermal analysis was carried out, and the temperatures of thermal effects that arise during the reduction of neodymium from a technological salt mixture of KCl–NaCl–CaCl2–NdF3 with a magnesium–zinc alloy were established. For sol–gel products of stoichiometric MgTiO3, accurate thermal expansion coefficients were measured. The effect of various nanoparticles, such as GaF3, ZnF2, Zn(BF4)2 and Ga2O3 additions, on the activity of CsF-RbF-AlF3 flux and mechanical behavior of Al/Steel brazed joints is presented. The effect of Bi substitution on the structural and magnetic properties of Nd1-xBixMnO3 is investigated. Characteristics of hard magnetic materials based on Nd2Fe14B and Ce2Fe14B intermetallic compounds are presented. A special algorithm is presented to support vector regression for estimating the maximum magnetic entropy change of doped manganite-based compounds. We have received information about the mechanical properties of the reactively synthesized porous Ti3SiC2 compound with different apertures. Furthermore, we have presented the experimental results of Zn-doped Al-rich for fast on-board hydrogen production.
Ti3SiC2 --- intermetallic compound --- porous material --- mechanical property --- pore size --- elastic modulus --- Al-rich alloy --- hydrogen generation --- Zn addition --- Ga2O3 --- flux --- Zn-Al filler metal --- wettability --- spreadability --- magnetocaloric effect --- support vector regression --- extreme learning machine --- maximum magnetic entropy change --- gravitational search algorithm --- GaF3 --- CsF-AlF3 flux --- R-Fe-B intermetallics --- cerium --- permanent magnets --- simulation --- magnetic anisotropy constant --- hysteresis loop --- coercive force --- residual magnetization --- X-ray diffraction --- perovskites manganites --- AC magnetic susceptibility --- ZnF2 --- Zn(BF4)2 --- mechanical properties --- MgTiO3 --- geikielite --- high-temperature X-ray diffraction --- sol-gel technique --- thermal expansion --- magnesium–zinc–neodymium master alloy --- Mg–Zn–Nd --- magnesium master alloy --- magnesium --- rare-earth metals --- master alloy synthesis --- metallothermic reduction --- n/a --- magnesium-zinc-neodymium master alloy --- Mg-Zn-Nd --- Engineering --- Technology --- History.
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During the past decades, the subject of calculus of integrals and derivatives of any arbitrary real or complex order has gained considerable popularity and impact. This is mainly due to its demonstrated applications in numerous seemingly diverse and widespread fields of science and engineering. In connection with this, great importance is attached to the publication of results that focus on recent and novel developments in the theory of any types of differential and fractional differential equation and inclusions, especially covering analytical and numerical research for such kinds of equations. This book is a compilation of articles from a Special Issue of Mathematics devoted to the topic of “Recent Investigations of Differential and Fractional Equations and Inclusions”. It contains some theoretical works and approximate methods in fractional differential equations and inclusions as well as fuzzy integrodifferential equations. Many of the papers were supported by the Bulgarian National Science Fund under Project KP-06-N32/7. Overall, the volume is an excellent witness of the relevance of the theory of fractional differential equations.
weakly upper semicontinuous --- essential maps --- homotopy --- Riemann-Liouville fractional differential equation --- delay --- lower and upper solutions --- monotone-iterative technique --- homoclinic solutions --- fourth-order p-Laplacian differential equations --- minimization theorem --- Clark’s theorem --- exponential dichotomy --- roughness --- asymptotically constant matrices --- double fuzzy Sumudu transform --- partial Volterra fuzzy integro-differential equations --- n-th order fuzzy partial H-derivative --- m-dissipative operators --- limit solutions --- integral solutions --- one-sided Perron condition --- Banach spaces --- fixed point --- complete metric space --- fractional differential equations --- optimal feedback control --- Voigt model --- alpha-model --- fractional derivative --- Riemann–Liouville fractional differential equations --- nonlocal boundary conditions --- positive solutions --- existence --- multiplicity --- Caputo derivative --- Riemann–Liouville integral --- multipoint and sub-strip boundary conditions --- fixed point theorem --- fractional Navier–Stokes equations --- variable delay --- modified fractional Halanay inequality --- generalized comparison principle --- dissipativity --- Fourier-Laplace transforms --- porous material --- eigenvalues method --- fractional time derivative
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Engineering practice requires the use of structures containing identical components or parts, useful from several points of view: less information is needed to describe the system, design is made quicker and easier, components are made faster than a complex assembly, and finally the time to achieve the structure and the cost of manufacturing decreases. Additionally, the subsequent maintenance of the system becomes easier and cheaper. This Special Issue is dedicated to this kind of mechanical structure, describing the properties and methods of analysis of these structures. Discrete or continuous structures in static and dynamic cases are considered. Theoretical models, mathematical methods, and numerical analyses of the systems, such as the finite element method and experimental methods, are expected to be used in the research. Machine building, automotive, aerospace, and civil engineering are the main areas in which such applications appear, but they are found in most engineering fields.
exact solutions --- the generalized Benjamin–Bona–Mahony equation --- generalized exponential rational function method --- solitary wave solutions --- symbolic computation --- Thomson effect --- initial stress --- magneto-thermoelastic --- voids --- normal mode method --- G-N theory --- eigenvalue problem --- axisymmetric and non-axisymmetric vibrations --- multiparametric special functions --- circular plate --- functionally graded porous material --- initially stressed bodies --- dipolar structure --- volume fraction --- domain of influence --- chaotic time series prediction --- neural network --- firefly algorithm --- CEEMDAN --- VMD --- symmetric geometry --- guitar’s plate --- modal analysis --- skew symmetric eigenmodes --- comparison --- Friedman test --- linear regression --- nonlinear regression --- sign test --- symmetric errors --- Wilcoxon test --- coefficient of variation --- ratio --- symmetric and asymmetric distributions --- test of hypothesis --- multi-body system --- finite element method (FEM) --- linear elastic elements --- Lagrange’s equations --- two-dimensional finite element --- plane motion --- backward in time problem --- dipolar thermoelastic body --- uniqueness of solution --- Cesaro means --- partition of energies --- α-fractional calculus --- vibration isolation --- fractional-order differential equation --- rubber-like elastomers --- Riemann–Liouville/Caputo/Grünwald-Letnikov fractional derivative --- advanced mechanics --- analytical dynamics --- acceleration energies --- robotics --- viscoelasticity --- type III thermal law --- finite elements --- error estimates --- numerical results --- symmetry --- topology --- mechanical structures --- robots --- vibration --- mechanical engineering --- applied mechanics --- bird-strike impact --- composite laminate --- damage equivalency --- fan blade --- symmetrical configurations
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This Special Issue is one of the first for the new MDPI flagship journal Chemistry (ISSN 2624-8549) which has a broad remit for publishing original research in all areas of chemistry. The theme of this issue is Supramolecular Chemistry in the 3rd Millennium and I am sure that this topic will attract many exciting contributions. We chose this topic because it encompasses the unity of contemporary pluridisciplinary science, in which organic, inorganic, physical and theoretical chemists work together with molecular biologists and physicists to develop a systems-level understanding of molecular interactions. The description of supramolecular chemistry as ‘chemistry beyond the molecule’ (Jean-Marie Lehn, Nobel Lecture and Gautam R. Desiraju, Nature, 2001, 412, 397) addresses the wide variety of weak, non-covalent interactions that are the basis for the assembly of supramolecular architectures, molecular receptors and molecular recognition, programed molecular systems, dynamic combinatorial libraries, coordination networks and functional supramolecular materials. We welcome submissions from all disciplines involved in this exciting and evolving area of science.
anion binding --- chloride receptor --- switchable system --- hydroquinone --- redox switch --- metal-organic frameworks --- vapour sorption --- solvatochromism --- desorption kinetics --- ion-channels --- crown-ethers --- bilayer membranes --- self-assembly --- supramolecular chemistry --- host–guest chemistry --- coordination cage --- catalysis --- crystal structure --- copper chloride complexes --- H-bonding pattern --- tetrazole ligands --- X-ray diffraction --- Hirshfeld surfaces --- uranium(VI) --- carboxylates --- capsules --- structure --- luminescence --- multicomponent cocrystal --- cocrystallization mechanism --- cocrystal synthesis --- crystal engineering --- porous material --- molecular recognition --- halogen bond --- co-crystal --- molecular tecton --- binary solid --- network structure --- σ-hole --- molecular electrostatic potential --- calixarenes --- coordination clusters --- manganese --- molecular magnetism --- host–guest interaction --- cucurbit[7]uril --- 4-pyrrolidinopyridinium --- copper complexes --- chlorido ligand displacement --- catalysis regulation --- Schiff base ligands --- urea hydrolysis --- coordination chemistry --- hydrogen bonds --- metalla-assemblies --- coordination-driven self-assembly --- orthogonality --- ligands --- metal ions --- complementarity --- hydrogen bonding --- cyclotricatechylene --- metal–organic cage --- helicate --- metallosupramolecular --- chirality --- copper(II) complexes --- pyrazolato ligands --- supramolecular assembly --- X-ray crystallography --- magnetic susceptibility --- EPR spectroscopy --- isotropic exchange --- antisymmetric exchange --- dipolar interaction --- DFT calculations --- hydrogen bond --- pyrazine --- chloropyrazine --- chloropyrazin-2-amine --- copper halide --- supramolecular structure --- conformational polymorphism --- intermolecular contacts --- N,N′,N″,N‴-Tetraisopropylpyrophosphoramide --- pyrophosphoramide --- synthons --- supramolecular motifs --- n/a --- host-guest chemistry --- host-guest interaction --- metal-organic cage --- N,N',N",N‴-Tetraisopropylpyrophosphoramide
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