Materials Literature
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Moravia, Czech Republic. It occurs as irregular grains up to 200 mm, which form aggregates up to 1–2 mm in size in a quartz gangue. These aggregates are replaced along the margins and fractures by a heterogeneous supergene Bi–Se–O phase. Other associated minerals included uraninite, hematite, and uranophane. Litochleb…
Graphene, which is a single layer of carbon atoms assembled in a honeycomb lattice, has recently attracted significant attention, primarily due to its extraordinary electronic properties. In fact, its photonic properties are not less exciting. Graphene interacts with light strongly from ultraviolet to far infrared, an…
The work presents the results of studying the mechanism of oxygen transport for a new promising class of oxygen-containing electrolytes based on lanthanum silicate with an apatite structure using impedance spectroscopy and isotopic oxygen heteroexchange. At 1000 K, in the case of samples with an optimum composition in…
Cathodoluminescence of oxygen-containing LiF crystals (LiF-O, LiF-O,OH, LiF-WO 3 ) is studied by pulsed spectrometry with nanosecond resolution upon excitation of crystals by a single electronbeam pulse at 15 K.
Abstract The Szklary holtite is represented by three compositional varieties: (1) Ta-bearing (up to 14.66 wt.% Ta 2 O 5 ), which forms homogeneous crystals and cores within zoned crystals; (2) Ti-bearing (up to 3.82 wt.% TiO 2 ), found as small domains within the core; and (3) Nb-bearing (up to 5.30 wt.% Nb 2 O 5 ,) f…
The influences of triangular fins’ positions on controlling the magnetization processes are investigated. It is observed experimentally that when the included angle between the triangular fins and the field direction is 15° or 30°, the magnetization reversals are repeatable in the sweep-up and sweep-down processes, an…
Sm(Co,Zr)7/α-(Fe,Co) nanocomposite magnets were produced by extensive milling of the mixture of crushed as-cast SmCo6.8Zr0.2 powders and 10 wt. % iron powders followed by annealing. The iron powders were added either with 600 min premilling or without premilling. The phase structures are studied by XRD patterns and th…
Abstract A duality in the behaviour of small particles, i. e. their ability to migrate along with some grain boundaries and, simultaneously, inability to move along with the others, has been shown to affect the character of the grain growth process. It is found by numerical simulations that a decrease in the particle…
In this paper, Eu 3+ -doped CaTiO 3 (CTO) nanoparticles were prepared by a sol-gel method. Three different charge compensation mechanisms were realized by substituting Eu ion at different sites. (i) Ca site substitution with Ca vacancy compensation (CTO-A); (ii) Ti site substitution with O vacancy compensation (CTO-B)…
It is essential to detect partial discharge (PD) as a symptom of insulation breakdown in high voltage (HV) applications. However accuracy of such measurement is often degraded due to the existence of noise in the signal. Wavelet Transform (WT) seems to be more suitable than traditional Fourier Transform in analyzing s…
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Temperature-dependent photoluminescence (PL) and time-resolved photoluminescence (TRPL) are measured for the (Ga1−xZnx)(N1−xOx) solid solution with x = 0.22 to study its luminescence properties. PL result shows that the material exhibits visible luminescence at around 1.87 eV (663 nm) with a broad emission band even a…
Electrical aging of polymer insulated power cables has been an important subject of investigation in the last several decades. Cable insulation is placed under heavy electrical stress due to overvoltages occurring during switching operations taking place in the power system. Transients overriding the normal ac operati…
The kinetics of the corrosion of mild steel in formic acid solutions of different concentrations has been studied at 25, 35 and 45°C. The corrosion rate was evaluated by weight loss and electrochemical polarisation techniques. There is good agreement between the data obtained by the two techniques. The maximum corrosi…
NdxY6−xFe68Mo4B22 (x = 1–5) nanocomposites were prepared directly by the devitrification of amorphous rods. The effects of Y doping on the glass-forming ability, microstructure, and magnetic properties of the alloys were also investigated. GFA of the alloys was found to get enhanced through substituting Nd with Y and…
The most stable isomers of NanBm (m + n = 6) clusters and their hydrogen storage properties are investigated by means of density functional theory with a 6-311+G(d) basis set. To study the hydrogen storage properties, all of the stable structures of NanBmHx (m + n = 6) clusters have been optimized. It shows that boron…
Two-dimensional infrared vibrational echo spectroscopy (2D-IR VES) provides information about the structural dynamics occurring on the ultrafast time scale, a temporal regime that is comparable to that of charge-hopping events in conducting polymer films. In this study, 2D-IR VES is used to study polyaniline (PANI) th…
AIMS: This investigation compared the tumor distribution, efficacy, blood pharmacokinetic parameters and hematological alterations following treatment with chitosan/glyceryl-monooleate (GMO) nanostructures containing paclitaxel (PTX) to a conventional formulation of PTX (Taxol(®)) in BALB/c female mice. MATERIALS & ME…
We derive exact analytical solutions for the focusing of Maxwell photons and massless Dirac particles by half-space with negative refraction. These novel paradoxical solutions show that half-space with negative refraction cannot be simply considered as a superlens. Instead of a 2D focus spot it results in the creation…
Solution processing is a facile method to generate magnetic thin films. Polyferrocenylethylmethylsilane (PFEMS) was doped with palladium (II) acetylacetonate using two methods: sublimation of Pd(acac)2 to form Pd nanoparticles in the PFEMS films and direct mixing of Pd with the PFEMS polymer precursor prior to film de…