Materials Literature
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This paper presents a study of the transient and steady electric currents through a pentyl-cyano-biphenyl (5CB) nematic liquid crystal (LC) cell. It is demonstrated that space-charge effects are important, contrary to what has been observed before. Specifically, the nematic interlayer can be considered as an inhomogen…
We present a novel technique to measure high frequency electron spin resonance spectra in a broad frequency range (30-1440 GHz) with high sensitivity. We use a quasioptical setup with tunable frequency sources to induce magnetic resonance transitions. These transitions are detected by measuring the change in the magne…
The inhibition effect of imidazolidine-2-thione (IMT) on the corrosion behaviour of mild steel (MS) in 1 N HCl was studied using potentiodynamic polarization, linear polarisation resistance (LPR), electrochemical impedance spectroscopy (EIS) and adsorption studies. The effects of inhibitor concentrations, temperature,…
Samples of single-phase Sr 2 FeMoO 6 were successfully prepared by solid-state reaction with long sintering times. The crystal structures of the Sr 2 FeMoO 6 samples were determined from X-ray powder diffraction data using the Rietveld refinement method. The structure results obtained by the Rietveld refinements show…
The paper presents development of an equivalent circuit model of a traction transformer with wound iron core intended for studies of transformer behavior in a traction drive system. The model accounts for the nonlinear BH characteristic and anisotropic properties of the wound core. Derivation of the mathematical model…
The DC poling field dependence of ferroelectric properties was investigated to evaluate the mechanism of domain alignment in lead-free ceramics of the forms of (1- x )(Na 0.5 Bi 0.5 )TiO 3 – x (K 0.5 Bi 0.5 )TiO 3 ( x =0.08–0.28), 0.79(Na 0.5 Bi 0.5 )TiO 3 –0.20(K 0.5 Bi 0.5 )TiO 3 –0.01Bi(Fe 0.5 Ti 0.5 )O 3 and (1- x…
Abstract Homogeneous ZnSe nanocrystals were prepared via surfactant-assisted hydrothermal method. Surfactants agent CTAB was used to control the particle morphology and the growth rate. The structure, morphology and optical properties of ZnSe nanocrystals have been investigated by XRD, TEM and luminescence spectroscop…
A method of obtaining free graphene films using intercalation and subsequent thermal expansion of crystalline graphite is suggested. Thermally expanded graphite prepared by microwave irradiation is examined under a scanning electron microscope. It is found that it contains fragments of free graphene films. The conclus…
This paper presents research motivated by industrial demand for energy storage system for city transport vehicles. The kinetic energy is accumulated into the supercapacitor during vehicle braking. This energy can be used to accelerating again. It is important to save the energy in the vehicles, which accelerate very o…
Fuel cell technologies provide clean and efficient power solutions for both stationary and mobile applications. For shipboard applications, most studies published so far have focused on ship service power or on propulsion power for small vessels with moderate power requirements. Using a military sealift vessel as the…
Glass fillers were added into polyethylene (PE) with the aim to prepare fire-resistant PE composites. The effect of glass additives on ceramification of the composites and the properties of ceramic residue was investigated. Scanning electron microscopy (SEM) showed that there was a stronger interaction between glass f…
The effect of thermal behaviour, such as thermal insulation, thermal conductivity and thermal diffusion, of single jersey, rib and interlock knitted fabrics made out of ringand compact-spun yarns has been studied. The physical characteristics, such as fabric aerial density, air permeability, tightness factor, and fabr…
Thermoplastic polymer foams can be produced using expandable beads like Expancel microbeads. In this work, density graded polyethylene foams were produced by imposing a temperature gradient using compression moulding. This was done by controlling independently the top and bottom plates of the mould at different temper…
Abstract In dieser Arbeit wird das Potenzial der ECAP‐Umformung (engl. E qual‐ C hannel A ngular P ressing) für eine Skalierung vom Labor‐ zum industriellen Großmaßstab betrachtet. Im Fokus der Untersuchungen stehen dabei insbesondere die Erfassung und Quantifizierung von Skalierungseffekten auf die mechanischen Eigen…
Thin films of bismuth layer-structured dielectrics (BLSDs), CaBi 4 Ti 4 O 15 , and SrBi 4 Ti 4 O 15 , were prepared by a chemical solution deposition (CSD) technique on various substrates, such as (111)Pt/TiO 2 /(100)Si, (100)LaNiO 3 /(111)Pt/TiO 2 /(100)Si, and (100)SrRuO 3 ∥(100)SrTiO 3 substrates. Conductive perovs…
a - and b -axis-oriented (Bi 3.25 Nd 0.75 )Ti 3 O 12 (BNT-0.75) films, 3.0 µm thick, were fabricated on conductive Nb:TiO 2 (101) substrates with 0.001–0.79 mass % Nb at 650 °C by high-temperature sputtering. All the films had a mostly single-phase orthorhombic structure and a - and b -axis orientations. The degree of…
In this work is investigated the optimal conditions for deposition of pure- phase anatase and rutile thin films prepared at low temperatures (less than 150ºC) by reactive dc magnetron sputtering onto well- cleaned p- type Si substrates. For this, the variation of deposition plasma parameters as substrate- to- target d…
Abstract Nanofibers and composite nanofibers have been used as mechanical reinforcement in a bulk matrix, but there is little research done on bulk nanocomposites made out of nanofibers. In the current study, in situ grown composite fibers of poly( DL ‐lactide) (PDLLA) and hydroxyapatite (HA) were obtained with uniaxi…
Thin films comprising parallel nanorods were deposited by directing silver vapor obliquely toward a plane substrate. The direction of the vapor flux was varied in two different ways to sculpture the nanorods in different shapes. The reflection and transmission coefficients of the thin films were measured at three wave…
Abstract Mesoporous MCM-41 molecular sieves containing f-block transition elements (gadolinium) with various Si/Gd ratios (50, 75 and 100) were synthesised by a hydrothermal method. Their mesoporous structure was confirmed by X-ray diffraction, nitrogen sorption studies, thermogravimetric analysis, scanning and transm…