Materials Literature
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Heat transport in nanostructured semiconductor devices has been investigated. Numerical simulations of acoustic phonon propagation through a dedicated Monte Carlo model in nanodevices have been performed. Material dispersion curves are taken into account and the Boltzmann collisional term is considered under the relax…
Nearly single-phase samples of compound TbCo5 + δ (where δ = 0) are obtained and certified in the poly-and monocrystalline state. The latent heat is measured on these samples for the first time in the region of the spin-reorientation phase transition using differential scanning calorimetry. The latent heat of the tran…
The effect of dimethyl 2-(2–hydroxyphenyl amino)–3-(triphenyl phosphoranylidene) butanedioate, (L–OH), an organic compound on the corrosion parameters of Ti-6Al-4V in the mixture of concentrated phosphoric and formic acid at different temperatures (20, 30, 40 and 50±1°C) were investigated by potentiodynamic method. It…
Abstract At present magnetic refrigeration shows a realistic potential to penetrate into some niche markets in the field of cold and hot “production”. It is well known that a refrigerator for cooling and a heat pump for heating are machines based on the same principle. A small review on magnetic heat pump studies is o…
Abstract Epitaxial relations are often described by the mismatch of lattice parameters between the two materials. When the structures forming the epitaxial interface are dissimilar, the lattice mismatch is often less meaningful because of the different geometrical arrangement of atoms in the two structures. In a previ…
We have determined the crystal structure of tvalchrelidzeite, Hg3SbAsS3, for the Þ rst time with single-crystal X-ray diffrac-tion. It is monoclinic, with space group P21/n and unit-cell parameters a 11.5526(4), b 4.3852(1), c 15.6373(5) Å, 91.845(2)°, V 791.79(5) Å3. There are eight symmetrically distinct sites in th…
Abstract Spinel ferrites, MFe 2 O 4 (M = Ni, Mg, Co, Li) samples were prepared by sol‐gel method. It has been studied by X‐ray diffraction, Mössbauer spectroscopy. X‐ray diffraction patterns were analyzed by the Rietveld refinement. The samples have been cubic spinel structure with the lattice constant ( a 0 ) is 8.32…
The paper presents results of TEM investigations of Elektron 21 magnesium alloy in as cast condition and after heat treatment. The compositions of the Elektron 21 alloy used in the present study was Mg-2,7%wtNd-1,2%wtGd-0,47%wtZr. Solution heat treatment was performed at 520°C/8 h/water. Ageing treatments were perform…
Abstract The graft polymerization of Styrene and Methyl methacrylate (MMA) onto deproteinized natural rubber latex (DPNR) was carried out using ammonium peroxy disulfate (N 2 H 8 O 8 S 2 ) as an initiator. The suitable reaction conditions based on the higher monomer conversion was determined. The degree of grafting an…
Sodium 13-vanadomanganate Na 7 [MnV 13 O 38 ]·5H 2 O ( I ) has been synthesized and studied by mass spectrometry, thermogravimetry, IR spectroscopy, and X-ray powder diffraction analysis. The crystals of compound I are monoclinic: a = 11.487 Å, b = 7.613 Å, c = 11.359 Å, β = 114.15°, V = 906.52 Å 3 , ρ calcd = 2.73 g/…
A new Ti50Ni48.7Ta1.3 shape memory alloy was designed for medical application. In order to influence the martensitic transformation temperature the alloy was solution treated and additionally aged at 400oC for various time. Phase transformation was studied applying differential scanning calorimeter (DSC) and X-ray dif…
Chesnokovite, a new mineral species, is the first natural sodium orthosilicate. It has been found in an ussingite vein uncovered by underground mining at Mt. Kedykverpakhk, Lovozero alkaline pluton, Kola Peninsula, Russia. Natrolite, sodalite, vuonnemite, steenstrupine-(Ce), phosinaite-(Ce), natisite, gobbinsite, vill…
At present, most of the on-line insulation monitoring systems are cable network. They exposed many disadvantage in application, such as complicated wiring, installation difficulties, easily affected by electromagnetic interference. To solve the above problems, a new wireless on-line insulation monitoring system is pro…
We have measured the ultrasound velocity and absorption in BeO, Al 2 O 3 , ZrO 2 , and SiO 2 ceramics. The results indicate that the ultrasound velocity in oxide ceramics depends on the nature of the basic oxide component, the density of the material, and the preferential alignment of the grains. The ultrasound veloci…
This paper describes the result of an investigation on the effect of air gap of core lamination in two 3-phase distribution transformers 1000 kVA. The investigation involves the variation of power loss, building factor, the third harmonic distortion and flux leakages. The power loss and flux distribution have been mea…
This study investigated how different light conditions affect the growth and accessory pigment to chlorophyll a ratios in Thalassiosira pseudonana. The microalga was grown for five days under four irradiances (50, 150, 300 and 750 µmol Valenzuela-Espinoza E., R. Millan-Nunez, C. C. Trees, E. Santamaria-del-Angel and F…
Abstract Al‐added Zn 0.99‐x Fe x Al 0.01 O (x = 0, 0.02, 0.05) powders were prepared with an annealing in an Ar atmosphere at 1200 °C. All the peaks from the X‐ray diffraction patterns of the samples belonged to the hexagonal ( P6 3 mc ) lattice of ZnO, and no indication of a secondary phase was found. The lattice par…
The development of a method for making an adherent coating of Au/TiO 2 on a cordierite monolith is described. The optimum method entails first forming a wash-coat of TiO 2 by combining a colloidal dispersion of TiO 2 with Degussa P-25 TiO 2 that has been washed, dried and crushed. Subsequent deposition of gold from HA…
Abstract Polypropylene / organically modified montmorillonite nanocomposites were prepared using polypropylene-graft-maleic anhydride as compatibilizer by the melt blending method. The structural, mechanical and gas barrier properties of the prepared nanocomposites containing various amounts of organoclay (i.e. 0, 2,…
New hyperbranched polymers have been synthesized through the 1,3-dipolar polycycloaddition of the AB 2 monomer—2-azido-4,6-bis(propynyloxy)-[1,3,5]-triazine. The polymers contain conjugated heteroaromatic triazine and triazole cycles and terminal acetylene groups. The products have been characterized by exclusion liqu…