Materials Literature
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Abstract Weissite, Cu 2–x Te (x ≈ 0.21), a very rare copper telluride, occurs in a sample from the Gambatesa mine, Val Graveglia, Liguria, Italy, where it occurs as purplish black anhedral grains up to 0.1 mm in length and shows a black streak. No cleavage is observed and the Vickers hardness (VHN 100 ) is 142 kg/mm 2…
This paper studies the symmetry properties of transmission lines loaded with electrically small bisymmetric resonators, that is, resonators that exhibit two orthogonal symmetry planes. The considered resonators are the so-called electric-LC (ELC) resonator, and its complementary counterpart, the magnetic-LC resonator…
Due to their impulsive nature, partial discharges in insulation systems emit in a broad band of frequencies ranging from tens of megahertz to gigahertz. Antennas can be placed at secure distances from the high-voltage source and measure partial discharges pulses on-line. The energy of partial discharges coexists with…
Four divalent transition chelate polymer compounds (1–4) were synthesised by condensation of ibpmpc (isophthaoyl bis(paramethoxyphenylcarbamide)) with metal acetate in a dimethylformamide medium. The synthesised polymer compounds 1–4 were characterised by elemental analyses, FT-IR, diffuse reflectance, magnetic moment…
For transport needs the hydrogen is mostly stored in a compressed (at 350-700 bars) form, while methods for its storage at lower pressures are rapidly developing. In particular, nanoporous oxides and zeolites, which do not normally absorb notable amount of hydrogen, with a small Pd additive or ion exchange demonstrate…
Methods of synthesis of iron(II) complexes containing cluster closo-borate anions—[Fe(Htrz)3]B10Cl10 (I) (HTrz is 1,2,4-triazole), [Fe(NH2Trz)3]B10Cl10 · 2H2O (II) (NH2Trz is 4-amino-1,2,4-triazole), [Fe{HC(pz)3}2]B10Cl10 (III), [Fe{HC(pz)3}2]B10H10 (IV), and [Fe{HC(pz)3}2]B12H12 · 2H2O (V) (HC(pz)3 is tris(pyrazol-1-…
Alloys of nominal composition Mg-3Zn-xCa (x = 0, 0.2, 0.5, 0.7, 1.0, 1.3) wt.% have been prepared by resistance melting and casting into graphite mould under argon atmosphere. All investigated alloys have revealed α(Mg) dendritic microstructures with intermetallic phases distributed in interdendritic spacing. The Mg4Z…
SrSnO3, a perovskite-type complex oxide, was synthesized by the modified Pechini method using two different precursors, tin chloride and metallic tin. The first one is already traditional in the literature and it claims about 30 days, only for the cleaning of tin citrate aiming at the elimination of the chloride. The…
This work studies the changes that occur in transformer insulation properties when voltages with steep fronts and high-frequency contents are applied. With a significant growth in the number of wind-farms and solar-plants that use power-electronic-based converters, the problems associated with such voltages on insulat…
Degradation of Solid Oxide Fuel Cells (SOFCs) can be minimized by maintaining reliability parameters during load changes. These reliability parameters are critical to maintain power generation efficiency over an extended life of the SOFC. For SOFCs to be commercially viable, the life must exceed 20,000 hours for load…
We developed a thermally assisted sputtering method (TASM) based on direct current magnetron sputtering to increase the rates of deposition of Sb2Te3and Bi2Te3films. The sputtering target was heated with the thermal energy of Ar plasma without any additional heating systems. The stoichiometric Sb2Te3(p-type) and Bi2Te…
Silver nanoparticles were synthesised on the modified cotton fibres using an in situ method. Acrylic acid was grafted on the surface of cotton using plasma technology as a means to enhance the loading efficiency of nanoparticles. The loading efficiency of silver nanoparticles into the cotton fabric was examined by an…
The interface formation between manganese phthalocyanine (MnPc) and cobalt was investigated combining ultraviolet photoelectron spectroscopy and inverse photoelectron spectroscopy. The transport band gap of the MnPc increases with the film thickness up to a value of (1.2 ± 0.3) eV while the optical band gap as determi…
The velocity of a two-dimensional aqueous foam has been measured as it flows through two parallel channels, at a constant overall volumetric flow rate. The flux distribution between the two channels is studied as a function of the ratio of their widths. A peculiar dependence of the velocity ratio on the width ratio is…
Cell tracking with magnetic resonance imaging (MRI) and iron nanoparticles is commonly used to monitor the fate of implanted cells in preclinical disease models. Few studies have employed these methods to study cancer cells because proliferative iron-labeled cancer cells will lose the label as they divide. In this stu…
Silica nanoparticles were synthesized using trimethoxyvinylsilane (TMVS) as silica precursor and butanol as solvent by micelles entrapment approach. Addition of tween 80 as anionic surfactant and NH3 as base catalyst controlled the size of silica nanoparticles. The aim of this study is to investigate the effect of syn…
A silver polystyrene sulfonate polyelectrolyte was synthesized, showing a spontaneous reduction of silver ions to silver nanoparticles over a period of approximately 1 month. A follow-up of the nanoparticle formation via scanning electron microscopy (SEM) reveals migration of the nanoparticles towards the cracks of th…
Using density functional theory (DFT) calculations, we investigated the electronic and magnetic properties of the Heusler compounds Co2TGe (T = Sc, Ti, V, Cr, Mn, Fe). Among the systems under investigation Co2CrGe and Co2MnGe have given 100% spin polarization at the Fermi energy (E F ). Co2CrGe is the most stable half…
Brush-like hierarchical SnO2/ZnO nanostructure with high surface to volume ratio was synthesized by a two-step growth method. In the first growth stage, SnO2 nanowires were fabricated by vapor transport method. In the second growth stage, ZnO nanorods were hydrothermally grown up around the SnO2 nanowires to form brus…
The object of the present study was to produce bacterial cellulose (BC) membranes and studying the effect of carbon source, time and conditions of inoculation, type of alkali used for purification and the method of drying on its porosity and thickness of the resultant membranes. Acetobacter xylinum was isolated from l…