Materials Literature
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Gallium Oxide is a promising material for power device applications. We focused on corundum structured gallium oxide (α-Ga2O3) and α-(AlxGa1-x)2O3/ α-Ga2O3heterostructure devices. We prepared α-(AlxGa1-x)2O3alloy and these laminate structures on c-plane sapphire substrates. The band offset of the α-Ga2O3/α-(AlxGa1-x)2…
Epitaxial lateral overgrowth (ELOG) of GaInP on GaAs by hydride vapor phase epitaxy (HVPE) is carried out as a pre-study to obtain GaInP/Si heterointerface. We present first results on the growth of GaInP/Si by a modified ELOG technique, corrugated epitaxial lateral overgrowth (CELOG).
The immobilization of 5,10,15,20-tetrakis(4’-carboxy-phenyl)porphyrin on the surface modified polypropylene films was investigated. To activate the surface of the polypropylene the method of structural-chemical modification of the acrylamide and polyvinyl alcohol developed, which can increase the number immobilizing p…
5,7-Di( tert -butyl)-2-(8-methanesulfonyloxyquinolin-2-yl)-1,3-tropolone whose structure was established by X-ray diffraction analysis and confirmed by 1 H and 13 C NMR, IR spectroscopy, and mass spectrometry, was obtained by the reaction of 2-methyl-8-methanesulfonyloxyquinoline with 3,5-di( tert -butyl)-1,2-benzoqui…
Human tear characteristics including pH and compositions can vary significantly depending on physical and environmental factors. Contact lenses directly contact with human tears can be swelled or de-swelled depending on the pH of the solution due to the nature of the hydrogel. For examples, anionic hydrogels, when the…
In this work, activated carbon nanofibers (ACNFs) from precursor polyacrylnitrile (PAN) and manganese oxide (MnO 2 ) were prepared via electrospinning process. The electrospun PAN/MnO 2 -based ACNFs were characterised in term of its morphological structure and specific surface area using SEM and BET analysis respectiv…
In this paper, GaN film was grown on AlN/PSS by hydride vapor phase epitaxy compared with GaN on planar sapphire. Thin AlN layer for buffer layer was deposited on patterned sapphire substrate (PSS) by metal organic chemical vapor deposition. Surface roughness of GaN/AlN on PSS was remarkably decreased from 28.31 to 5.…
Purpose: To develop a mathematical model of the fluence distribution of a proton pencil beam that is partially blocked by a collimator. Methods: In one dimension, an exact analytical solution of the proton distribution behind a collimator edge was derived, taking the beam's phase space, the edge position, and the scat…
Purpose: To investigate the relationship in MRI between B0 and the contrast‐to‐noise ratio (CNR) of various tumour/normal tissue pairs. This study is motivated by the current interest in MRI/radiotherapy hybrids, for which multiple magnetic field strengths have been proposed. CNR is the single most important parameter…
Thin films of Present study reports the quantitative estimation of light induced defects in aforesaid thin films by using thermally stimulated current technique. Measurements have been made in a vacuum 10 -3 Torr before and after exposing amorphous films to white light for different exposure times (0 to 6 h). Results…
In this paper, we present a comparative analysis of surface-mounted permanent magnet synchronous motors (SPMSM) and interior permanent magnet synchronous motors (IPMSM). First, we use 2D finite element analysis (FEA) to analyze models satisfying the same rated conditions according to the torque-speed curve characteris…
The mean energy loss straggling per unit path length of relativistic electrons in aluminum has been determined by recording electrons with a Si(Li) detector coupled to 8K multi channel analyzer. The energy loss straggling is determined by measuring the full width at half maximum of the spectrum of the incident and tra…
Abstract The paper presents results of assessment of the unit pressure force within the refractory material volume in the course press-moulding of stampings for refractory precast shapes. The force was evaluated with the use of physical simulation of deformation undergone by lead balls placed in the raw refractory mas…
The article deals with the analysis of the problem of the load-bearing capacity of reinforcing bars placed above the columns in slab-column connections of reinforced concrete structures. Failure of the support zone by punching and lack of proper structural integrity reinforcement can lead to a progressive collapse. Th…
The effect of the clathrate hydrate environment in the water/carbon dioxide system on the structure of the chitosan-coated collagen xenograft tissue was demonstrated. The collagen xenograft tissue treated in this environment is a porous material with a pore size of 50–500 nm having also micrometer size (1–3 μm) pores.…
It is known that copper has electrical and thermal conductivity. Therefore Cu-based alloys are used in technological and engineering applications. This paper is aimed at studying influence of various heat treatment on electrical resistivity properties of samples from binary Cu-Mn alloy. The chemical composition of the…
Studies on the sintering of manganese pyrovanadate depending on the temperature and the crystallite size show that we are prevented from obtaining a bulk ceramic sample by the anisotropic growth of grains. Investigation of the electrical properties of Mn 2 V 2 O 7 in the temperature range of 250–800°C reveals the acti…
A fluid model for the tokamak edge pressure profile required by the conservation of particles, momentum and energy in the presence of specified heating and fueling sources and electromagnetic and geometric parameters has been developed. Kinetics effects of ion orbit loss are incorporated into the model. The use of thi…
Effect of method of titanium dioxide hydrogel precipitation from TiCl 4 and NH 4 OH solutions on the properties of 0.0025–0.44 M hydrosols prepared by exposure to ultrasound radiation was studied. The hydrosols was shown to contain primary particles united into aggregates with average size 22–120 nm irrespective of hy…
Materials scientists at Harvard University in Massachusetts, working with other researchers across the US, have found a way to harness the quantum behaviour of solid oxide fuel cells (SOFCs), to make them even more efficient and robust. In doing so, they have observed a new type of phase transition in an oxide materia…