Materials Literature
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Screening tests using several reactors were performed to select low-activation raw materials. The number of samples was about 1500. Detailed data were obtained on the concentrations of Co and Eu in low-activation aggregates, low-activation cements, low-activation additives, and low-activation B4C sands. After that, we…
The thermal stability of the GeSbTe (GST) films deposited by layer-by-layer metalorganic chemical vapor deposition on the planar TiAlN∕Si and on trenches 120nm in diameter and 500nm deep (with aspect ratio of 4:1) was investigated under various annealing temperatures and durations in a nitrogen ambient atmosphere. The…
Abstract—The purpose of this study is to develop a system to utilize the successful experiences and help the beginners of garment pattern design (GPD) by optimization methods. A hybrid algorithm (NN-ICEA) based on Neural Network (NN) and immune co-evolutionary algorithm (ICEA) to predict the fit of the garments and se…
The dielectric properties of relaxor ferroelectric lead magnesium niobate Pb(Mg 1/3 Nb 2/3 )O 3 (PMN) ceramics have been investigated. These studies were conducted taking into account the characterisations of the complex dielectric permittivity (real and imaginary parts) as a function of temperature and frequency in a…
We discovered that reactions of hydrous cobalt and zinc acetates with 3,5-dimethylpyrazole (Hdmpz) in boiling xylene or toluene or upon the thermolysis of solid precursors (150°C) yield trinuclear pyrazolate-bridged complexes M 3 (μ-dmpz) 4 (Hdmpz) 2 (OOCMe) 2 (M = Zn or Co). Depending on the crystallization condition…
The frequency spectra and temperature dependences of the ac electric conductivity of MnGa 2 S 4 single crystals have been studied. It is established that the conductivity increases with the frequency and exhibits a resonance at 435–500 kHz. The activation energies of current carriers are determined. The activation ene…
Abstract The reorientational dynamics of dipoles in a series of blends of Polyethylene Glycol (PEG) and poly(amidoamine) (PAMAM) dendrimers were investigated by broadband dielectric relaxation spectroscopy (DRS). Measurements were performed over a wide range of frequency and temperature. Neat PEG exhibits three relaxa…
It is shown that industrial wastes such as apple pulp (generated in the cider production), cherry stones (from the industrial manufacture of Kirsh and jam) and PET (plastic vessels) can be recycled as activated carbons for electrode material in supercapacitors. These precursors allow obtaining carbons with large speci…
In this article, both carbon nanotubes (CNTs) adsorption capability of dioxins and ability of CNTs to carry catalysts which are used for destructing dioxins are reviewed. It is suggested that CNTs are superior adsorbents for dioxins as compared to traditional adsorbing materials. And the TiO2 coating layer, which is t…
A new perovskite-like compound Er0.73Cu3V4O12 (space group Im $$ \bar 3 $$ , Z = 2, a = 7.266 Å) has been synthesized barothermally (P = 8.0 GPa, t = 1000°C). Its electrical and magnetic properties have been studied. It is found that the temperature dependence of the electrical conductivity (in the range 78–300 K) has…
The results of the theoretical calculation of the proton conductivity tensor for single-walled carbon nanotubes are presented. The electronic structure of the objects under investigation is considered within the band model in the approximation of an ideal proton Fermi gas. The temperature dependence of the proton cont…
Anodic alumina films containing polyaniline and TiO2 or ZrO2 nanoparticles were electrochemically synthesised on an AA2024T3 aluminium alloy in a single step anodising process carried out in oxalic acid electrolyte containing aniline and nanoparticles. The morphology and composition of the films were examined by scann…
The kinetics of sedimentation of aqueous kaolin dispersion in the presence of multicomponent flocculating additives was studied. Binary and ternary mixtures based on poly-1,2-dimethyl-5-vinylpyridinium methyl sulfate, poly- N,N -dimethyl- N,N -diallylammonium chloride, and poly- N,N,N -trimethyl- N -methacryloyloxyeth…
Although precise analytical methods for studying transformer performance, such as iron loss, copper loss and stray loss, are complicated, the finite element method (FEM) proved to be a potential tool for analyzing this subject. This study illustrated that transformer parameters, such as core shape, air-gap length and…
In this paper, we achieved a very important gain improvement for a circularly polarized (CP) patch antenna using a new left handed medium (LHM) structure. To this end, a homogenization procedure of the LHM is carried out in order to design the patch antenna at a suitable frequency where the losses of the LHM are low.…
The free base porphyrin, tetraphenyl porphyrin (TPP) and metalloporphyrins of Cu, Ag and Sn were synthesized and characterized by UV-Visible spectroscopy, IR spectroscopy, 1 H NMR spectroscopy and Elemental analysis. The results are discussed in the light of magnetic susceptibility, diffuse reflectance spectroscopy (D…
We explore phonon decay processes necessary to the design of efficient rough semiconductor nanowire (NW) thermoelectric devices. A novel approach to surface roughness-limited thermal conductivity of Si, Ge, and GaAs NW with diameter D < 500 nm is presented. In particular, a frequency-dependent phonon scattering rate i…
(2009). THE USE OF THE TERMS CENTRIC AND PENNATE. Diatom Research: Vol. 24, No. 2, pp. 499-501.
Thermodynamic solubility is a decisive physicochemical property in drug development. The Chasing Equilibrium method offers an alternative to the classical procedures to measure the solubility of compounds with acid-base properties. The method is fast and yields accurate results. In this work, the solubility of several…
This paper discusses the use of photoacoustic models to obtain the nonradiative relaxation time (τ) and characteristic diffusion time (τβ) for a sample showing visible absorption bands from fluorescent ion-doped low-silica calcium aluminosilicate glass. Two models allowing phase shift analyses, the thermal-expansion a…