Materials Literature
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Laser-induced luminescence of OH s groups for undoped Al 2 O 3 oxides of various phase compositions was excited by pulsed nitrogen laser radiation at 337.1 nm. The luminescence band at 500–650 nm assigned to hydroxide groups of Al 2 O 3 , actually, consists of several lines at 500–515, 553, 567, 577, 607, and 633 nm;…
Transparent nanoglassceramics has been synthesized based on lead fluoride silicate glass doped with erbium ions. It is shown that heat treatment of lead fluoride silicate glass leads to the formation of nanoscale (16–40 nm) crystalline phase of lead fluoride. X-ray diffraction analysis and measurement of spectral lumi…
The structural and electronic properties of Ti in the SrTiO 3 /GaAs(001) interface are studied using the density functional theory. In all the structures examined, the formation energy of Ti on GaAs(001) decreases with decreasing Ti coverage. Sr or Ti adsorption atoms at the fourfold hollow sites with 1/4 monolayer co…
The stability, optimized structure, and electronic gap of four diamondoid complexes, adamantane, C(10)H(16), diamantane, C(14)H(20), triamantane, C(18)H(24) and the T(d)-symmetry isomer of pentamantane, C(26)H(32), incorporating cage-centered small atoms and ions (X@cage, where X = H(+), Li(0,+), Be(0,+,2+), Na(0,+),…
Samples of polycrystalline nickel of high (99.9945%) and commercial (99.5%) purity were studied in a series of planar impact experiments with initial, preshot, sample temperature ranging from 150 to 1150 K. The free surface velocity of the impacted sample was monitored by velocity interferometer. On the base of the re…
The equilibrium and microscopic properties of systems of discotic molecules have been investigated with Monte Carlo (MC) simulations. The study focuses on the behaviour of the fluid in the isotropic phase in the vicinity of the first liquid crystal transition, which involves either a nematic or a columnar phase. The m…
Basing on scale invariance of considered system an improvement of the Bertotti formula for energy loss in soft magnetic materials has been achieved. Assumptions of the Bertotti theory were discussed and criticized. As an alternative to this theory a new approach basing on the scale invariance of complex systems has be…
Abstract In this article, the influences of five operating variables on the molecular weight (or K ‐value), polydispersity index (PDI), as well as polymerization yield of emulsion poly (vinyl chloride) in batch reactor were investigated simultaneously using Taguchi experimental design approach. The variables were temp…
In order to restrain ferroresonance in coupling capacitor voltage transformers (CCVT), three kinds of ferroresonance suppression circuits (FSCs): the resonant type, the fast-saturation reactor type and electronic type which are connected to secondary side of CCVTs, are proposed in this paper. Frequency domain analyses…
The application of voltage response measurement is a very effective tool to determine of the aging state of oil-paper insulated cables. The initial slope of the decay voltage is directly proportional to the conductivity of the insulation and the initial slope of the return voltage is proportional to the intensity of p…
Controllable reactor is an important voltage control and reactive power compensation device in power system which is wide range voltage application, high reliability, low harmonic and simple maintenance, etc. The reactor iron core magnetic field distribution directly affects the reactor's loss and other properties. In…
The luminescent properties, including cathodoluminescence and photoluminescence, of the erbium-doped yttrium oxide (Er3+:Y2O3) nanotubes (NTs) have been systematically studied. These NTs were synthesized by a hydrothermal treatment followed by a dehydration process. Cathodoluminescent measurements show that every Er3+…
The thermal conductivity of PCB structures variations according to the position of the metal layers as a function of the local copper contents and distribution are studied. The value of the parallel and serial thermal conductivity coefficient of PCB have been calculated by usage of the corresponding electrical analogs…
Precise measurements of the relative volume change of vitreous B 2 O 3 have been performed by the strain-gauge technique at hydrostatic pressures up to 9 GPa. The features of the strain-gauge technique are analyzed and the specificity of the measurements of “relaxed” and “unrelaxed” bulk moduli is discussed. Smeared a…
Zn O ∕ Cd x Zn 1 − x O double heterostructures grown on a-plane sapphire substrates by pulsed-laser deposition were investigated concerning their photoluminescence properties. The localization of excitons in the CdxZn1−xO alloys were studied and analyzed with temperature dependent photoluminescence measurements from T…
Using the first-principles methods, we study the formation energetics and charge doping properties of the extrinsic substitutional defects in kaolinite. Especially, we choose Be, Mg, Ca, Fe, Cr, Mn, Cu, Zn as extrinsic defects to substitute for Al atoms. By systematically calculating the impurity formation energies an…
Vibration characteristics of double-walled carbon nanotubes (DWCNTs) with conveying fluid are analyzed based on the Euler–Bernoulli beam theory and using the wave propagation approach. The DWCNTs are considered as two nanotube shells coupled through the van der Waals interaction between them. The influences of interna…
At ambient temperature, interaction of the solid radical anion salt [Na(15-crown-5)][C2N4S2] with water vapour unexpectedly leads to the trithionate salt [Na(15-crown-5)]2[S(SO3)2], whose coordination pattern is very different from the previously studied trithionate salts.
The constants of the phenomenological potential of SrTiO3 are calculated allowing for recent experimental data. The α11, α12, and t 44 constants are refined by more than one order of magnitude as compared to the earlier values. The T-P phase diagrams for the case of the uniaxial [001] and [110] loading are calculated.…
Tetragonal scheelite-type CaWO4 nanocrystals recently prepared by a hydrothermal method show an enhancement of its structural symmetry with the decrease in nanocrystal size. The analysis of the volume dependence of the structural parameters in CaWO4 nanocrystals with the help of ab initio total-energy calculations sho…