Materials Literature
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A finite-element (FE)-based phase variable model of single-phase transformers is developed for fast and accurate dynamic simulation purposes. In the developed model, the winding flux linkages, psi1and psi2are used as the phase variables. Their values are obtained from a series of nonlinear FE computation over the full…
Tetravinylsilane was used to deposit hydrogenated amorphous silicon carbide (a-SiC:H) films with vinyl groups as functional species using an RF (13.56 MHz) pulsed plasma. Oxygen gas was mixed in tetravinylsilane to improve the compatibility of a-SiOC:H thin films with the silicon dioxide component. The oxygen-to-total…
Abstract Three series of porphyrin liquid crystalline compounds, [5‐( p ‐alkoxy)phenyl‐10, 15, 20‐tri‐phenyl] porphyrin and their rare earth complexes (Tb (III), Dy (III), Er (III), Yb (III)), with a hexagonal columnar discotic columnar(Col h ) phase have been synthesized. These compounds were characterized by element…
Low density polyethylene from 0.1 to 1 mm thick samples have been submitted to an increasing divergent field at room temperature until breakdown occurs. The breakdown field has been measured for different voltage waveforms: DC ramp, 50 Hz sine ramp and rectified 50 Hz sine ramp. The observed differences have been attr…
Carbon nitride (CN x ) with a high nitrogen content was synthesized using a nitrogen atmospheric pressure plasma. In this method, a reaction space with a high temperature and a high nitrogen content was generated. Under this condition, it was expected that a dense nitrogen radical reacting with a carbon radical would…
Silicon dioxide and titanium dioxide films show varying biocompatible characteristics when used as a passive biocompatible coating for an implant. The difference in their behaviour in biological environment is due to many factors like surface energy, surface charge, semi-conducting nature, surface roughness, coefficie…
Hexagonal V 0.13 Mo 0.87 O 2.935 nanowires were hydrothermally synthesized at 220 °C for the first time. X-ray diffraction and field-emission scanning electron microscopy were utilized to characterize the phase and morphology of the nanowires, respectively. Transmission electron microscopy and selected area electron d…
An optical quality silica glass doped with Er 3+ , Yb 3+ and Lu 3+ ions is synthesized by the sol-gel method. Virtually unavoidable clusterization of rare-earth elements that occurs upon introduction of lanthanide salts into a sol-gel system and leads to concentration quenching of luminescence of the glass is eliminat…
Twisted nematic gratings, originating from three-dimensional photoalignment of mesogenic molecules, have been recorded in azo-dye-doped liquid crystals by a polarization holographic technique. The three-dimensional distributions of the director were extensively investigated by considering the photoalignment of the azo…
Meso-scale mathematical model of local reaction and transport processes in a porous, supported heterogeneous catalyst with bimodal pore-size distribution is presented. The model takes into account individual reaction steps on active sites (microkinetics), diffusion of reactants in macro-pores and meso-/micro-pores (mo…
In this paper, the mechanism of tension compensator (TC) was analyzed. The effect of TC on properties of Sirofil composite yarn, such as the hairiness property and the property of abrasion-resistance, was studied theoretically and experimentally. The theoretical results agreed very well with the experimental data. It…
A combination of experiments and regression analysis has been utilized to extend the useful range of models for estimating flashover performance of insulators under contaminated conditions. Experiments were performed on distribution class insulators employing porcelain, silicone rubber and ethylene propylene diene mon…
Thermal decomposition of UO 2 (NO 3 ) 2 ·6H 2 O to U 3 O 8 was studied by thermogravimetric (TG), differential thermogravimetric (DTG), and differential thermal (DTA) analyses in combination with gaschromatographic and chemical methods. The process is described by kinetic data recorded under the non-isothermal conditi…
The effect of the oxygen partial pressure on the spinodal decomposition in the Ba 2 YCu 3 O 6 —Ba 2 YCu 3 O 7 system has been studied. A decrease in the oxygen partial pressure was found to increase the decomposition rate. The most probable cause of the effect consists in the decrease of oxygen concentration in the ne…
This paper reports on a dielectric study of MCM-41 molecular sieves with cellular channels of different sizes filled with the NaNO 2 ferroelectric. The temperature dependences of the permittivity and electrical conductivity of sodium nitrite in cellular channels are calculated from experimental data on the permittivit…
Three-dimensional nonlinear eddy current and stray-field loss analysis of multisteel configurations based on TEAM Problem 21 family and the related validation are presented. Some extended investigations to Problem 21, referred to as postbenchmarking, are outlined. The newly measured and calculated results of both the…
A vapor-liquid-solid method has been used to study the temperature dependent growth mechanism of Ge nanostructures on Au-coated Si (100) substrates. The formation of Ge nanodots, nanorods, and nanowires has been observed at different growth temperatures. The diameter of grown nanowires is found to be varying from 40 t…
Bagasse fiber, a by-product of the sugar making process, maintains a coherent xylem structure and can offer mechanical reinforcement to composite materials. Biopolyester bagasse composites were prepared with biodegradable matrices polyhydroxylbutyrate (PHB) and its copolymer containing polyhydroxyvalerate (PHBV). Both…
The thermoelectric compound TiS 2 is studied by using the full-potential linearized augmented plane-wave method on the density functional theory with the generalized gradient approximation (GGA) as well as the on-site Coulomb interaction correction (+ U ). The Seebeck coefficient of TiS 2 is calculated based on the el…
Abstract The Chinese philosopher Lao Tzu wrote that “a journey of a thousand li begins with a single step”. † My first step on the road to ultrafine-grained materials occurred on 5 May, 1989, when I boarded a plane in Los Angeles on the way to Ufa via Copenhagen and Moscow. This review provides a very brief summary of…