Materials Literature
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The relationships between mechanical properties and microstructure of Ti-29Nb-13Ta-4.6Zr in under aged, peak aged and over aged conditions at various aging temperatures were investigated. The maximum Vickers hardness values of Ti-29Nb-13Ta-4.6Zr aged at 573 K, 673 K and 723 K are obtained at aging times of around 2419…
Compósitos que utilizam fibras vegetais como reforço têm despertado crescente interesse por parte da comunidade científica e industrial. O bagaço e a palha de cana são materiais renováveis e quando usados como reforço em uma matriz termoplástica podem dar origem a compósitos com baixo custo, baixa densidade e interess…
Geothermal and solar heat are attractive and environmentally clean energy sources for future power systems where solid state generators may become more important. In this paper, a generator model for such a novel conversion system is presented. Benefits and constraints are shown using a thermoelectric generator for so…
In this paper we report the fabrication, properties and degradation studies of banana fibers–reinforced thermoplastic polymers. In order to impart hydrophobicity to the fibers and also to concomitantly increase interfacial bond strength, which is a critical factor for obtaining better mechanical properties of composit…
We previously reported that the electric permeability εr' of ferromagnetic nanocomposite oxide sputtered films with a Bi2O3-Fe2O3-PbTiO3 ternary system is subject to change with an external magnetic field H and that electric polarization induced by a small ac magnetic field, ΔPh(ω), is observed. To explain these exper…
Mutnovskite, ideally Pb 2 AsS 3 (I,Cl,Br), is a new mineral from the high-temperature fumaroles of the Mutnovsky volcano, Kamchatka Peninsula, Russian Federation. It occurs as microscopic rubycolored short-prismatic crystals up to 100 μm across, closely associated with halogen-sulfosalts of Pb, Bi, and As, Cd-Pb-Bi su…
The semiconductive properties of anodic niobium oxides formed at constant potential and constant current density to different final voltages have been examined by Mott-Schottky analysis. Thin anodic oxides were formed on sputtered niobium specimens at constant potential in the range of 2.5 to 10 V Ag/AgCl in a borate…
Abstract Novel organoboron polymers containing transition metals (Ni, Pd, Pt) and pyrazaboles in the main chain were prepared by Cu-catalyzed coupling polymerization. The Ni- and Pt-containing polymers showed MLCT (metal-to-ligand charge transfer) absorption, whereas the Pd-containing polymer did not demonstrate the a…
Light-storing-emitting materials composed of are synthesized via the wet combustion method, and the fluffy resultants obtained are easily pulverized into powder samples. The fluorescent spectra of the sample show the same characteristics as those samples fabricated by the dry method. But the phosphorescent spectrum sh…
An alternative cycle proposed for refrigeration and gas liquefaction is active magnetic regenerator (AMR) refrigeration. This technology relies on solid materials exhibiting the magnetocaloric effect (MCE), a nearly reversible temperature change induced by a magnetic field change. This work focuses on numerical simula…
We have performed the first principles calculations on doped δ-Bi 2 O 3 to investigate ionic conductivity. The crystal structure and the ionic conductivity are discussed in total energy and density of states (DOS) from the calculations. The stabilized δ-phase Bi 2 O 3 doped rare-earth metal was explained from DOS data…
In this study, the effects of braid pattern and take-up rate on the mechanical properties of the tubular braided ropes of polypropylene were investigated. Strand fineness of 70 tex and 150 tex, braid pattern of 1/1 and 2/2, and high & low take-up rates were selected For both strand finenesses, the highest values for m…
Preface Co-operative Anistropic Theory of Ferromagnetic Hysteresis Image Reconstruction and Geometrical Analysis of Three-Dimensional Fracture Surfaces in Materials Optical Properties of Pd-free Au-Pt-based High Noble Alloys Gravitational Effects on the Weld Pool shape and Microstructural Evolution of Ni, 304 Stainles…
Hydrogen absorption behavior and hydrogen embrittlement properties of 1000-1800 MPa grade ultra high-strength low alloy TRIP-aided steels with bainitic ferrite matrix were investigated. The TRIP-aided steels absorbed a large amount of hydrogen, compared with the conventional tempered martensitic and bainitic steels. I…
A new concept of maximum power point tracking control method for Thermoelectric Power Generator (TEG) systems has been developed. The virtual load conductance of the load is feedback controlled to maintain the same value of the internal conductance of the thermoelectric (TE) array using DC-DC converter. The prototype…
We present a simple and highly reproductive method for the preparation of thin films consisting of strontium titanate nanoparticles. The films are produced by spin coating of a sol on silicon targets and subsequent annealing under ambient conditions. Analysis by atomic force microscopy shows particles with typical siz…
This paper provides a theoretical context for the types of errors that are likely to occur during the measurement of high frequency cable shield properties. The paper considers a RC dielectric system as it relates to measuring the dielectric properties of cable shield materials.
The effect of training strain, deformation temperature and number of training cycles on the two-way shape memory effect (TWSME) and its stability have been investigated systematically in a Ti46.3Ni44.7Nb9 (at%) wide hysteresis shape memory alloy (SMA). The experimental results indicate that two-way shape memory strain…
The quantitative structure–property relationships (QSPR) have been developed for the stability constants of complexes between 63 different organic ligands and 14 lanthanides. The QSPR models for a series involving a single metal were constructed using only theoretical descriptors for ligands within the CODESSA program…
A process was developed that uses a porous anodic alumina (PAA) mask as a template to electrochemically grow supported metal nanodots and nanowires without the need of aluminum evaporation. A PAA film was fabricated from a high purity Al foil and transferred onto a copper-coated silicon wafer. Nickel was plated with d…