Materials Literature
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The recently derived 2-D equations for extensional, flexural, and thickness-shear motions of laminated plates of piezoelectric/piezomagnetic layers are employed in the analysis of the frequency dependence of magnetoelectric couplings in laminated plates of piezoelectric and piezomagnetic layers driven by time-harmonic…
We construct a generalized structural-parametric model of a multilayer electroelastic solid and determine how the geometric and physical parameters of the transducer and the external load affect its static and dynamical characteristics. We obtain the transfer functions of a multilayer electroelastic solid for an elect…
The magnetic properties of the parent and martensite phases of the Ni2Mn1+xSn1-x and Ni2Mn1+xIn1-x ternary alloys and the magnetic field-induced shape memory effect obtained in NiCoMnIn alloys are reviewed, and our recent work on powder metallurgy performed for NiCoMnSn alloys is also introduced. The concentration dep…
In this paper the launching of liquid polymer jets from the apex of gas bubbles on the polyvinylpyrrolidone in ethanol (PVP) solution surface due to an applied electrical potential is investigated. Jets of polymer launched from bubble provide an alternative method for electrospinning polymer nanofibers that may be sca…
In the recent decade, metamaterials have become one of the popular areas of interest. Some of the various structures of Split-Ring Resonators (SRR) we have come across are circular, square, spiral and omega shaped. All these structures produce effective permeability and permittivity as negative over a certain range of…
A Review of Thermoelectric MEMS Devices for Micro-power Generation, Heating and Cooling Applications
The local structure of a Zn, Sn codoped In2O3 thin film grown on ĉ-plane sapphire by pulsed-laser deposition was examined by polarization-dependent x-ray absorption spectroscopy. The bixbyite film structure is both out-of-plane and in-plane oriented, and the structural results show that both Zn and Sn dopants occupy…
Lanthanide complexes are more and more used in biomedical imaging as contrast agents (CA). The development of these paramagnetic complexes as CA for medical magnetic resonance imaging (MRI) and luminescent probes for optical imaging is very complementary. Gd complexes are well known as CA for MRI and Eu/Tb complexes a…
A method based on Frenkel-Poole emission is proposed to model the amorphous state (high resistance state) in mushroom-type phase-change memory devices. The model provides unique insights to probe the device after amorphizing (RESET) operation. Even when the resistance appears the same under different RESET conditions,…
Glasses and glass-ceramics based on the ternary system CaMgSi2O6–NaAlSi2O6–Ca5(PO4)3F (diopside (Di)–jadeite (Jd)–fluorapatite (FAp)) have been studied using magic angle spinning (MAS) NMR, powder X-ray diffraction (XRD) and thermal calorimetry. In this silicate system Na2O and Al2O3 have been progressively substitute…
Peculiarities of CeO 2 nanoparticle coarsening during hydrothermal treatment in a neutral medium are determined by small-angle neutron scattering, powder X-ray diffraction, low-temperature nitrogen adsorption, and transmission electron microscopy. Coherent intergrowth of individual CeO 2 crystallites is the main scena…
The main goal of the work was the elaboration of the analytical functional relationship between refractive index n and density of SiO 2 layers on silicon substrates. Such (n) relationship will give possibility to determine elastic and non-elastic strains in SiO 2 layers on silicon substrates. Ellipsometric measurement…
Abstract In this paper we investigated the optical properties of ZnO and Mn doped ZnO nanocrystals that were fabricated by a vapor phase transport growth process, using zinc acetate dihydrate with or without Mn in a constant O 2 /Ar mixture gas flowing through the furnace at 400≈600°C, respectively. The as grown ZnO n…
In this paper, a novel fractal spiral resonator is presented. The geometry of the proposed structure is based on the direct connection of two concentric Hilbert fractal curves of different dimensions as in a spiral form. The magnetic resonance and negative permeability are demonstrated by numerical simulations and ana…
Abstract The photochemical grafting HEMA onto poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) PHBHV films using benzophenone (BP) or H 2 O 2 as initiator was investigated to develop a route of grafting restricted to the surface. The effect of various parameters, such as monomer concentration, initiator, and reaction time…
For the bulk tungsten divertor row, a development for the ITER-like wall in JET, utmost care was taken to limit the stresses in the solid tungsten plasma-facing components. The bulk W tile is located at the position of the outer strike point for most envisaged plasma configurations. The absence of active cooling makes…
Abstract Thermal stability of alkyl and arylalkyl quaternary ammonium cation (onium) in starting chloride salt, in organoclay obtained after exchange with montmorillonite (MMT) and after mixing of the organoclay with isoprene rubber was examined using conventional TGA and by mass spectrometry pyrolysis/GC-MS. Degradat…
Pouco se conhece sobre a biogeografia e variabilidade morfológica das espécies de Gomphonema e Gomphosphenia no Brasil. Gomphonema é um gênero bem representado em riqueza e abundância na flora algal perifítica, principalmente pela secreção de mucilagem pelo campo de poros, o que facilita a adesão das células aos subst…
The influence of InF(3) doping and remelting on Eu-doped fluorozirconate-based glass ceramics was investigated using near-edge x-ray absorption and optical spectroscopy. It was found that the addition of InF(3) to the melt decreases the Eu(2+)Eu(3+) mole ratio, while remelting leads to a significant change in the Eu(2…
ASDEX Upgrade was operated with about 6400 s plasma discharge during the scientific program in 2007/2008 exploring tungsten as a first wall material in tokamaks. In the first phase, the heating power was restricted to 10 MW. It was increased to 15 MW in the second phase. During this operational period, a delamination…