Materials Literature
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This article provides the results of the study of the strain-stress state of two corrugated shell structures. Geometric modeling was conducted in “Autodesk Inventor” system. Corrugated shell structures were studied with the help of engineering analysis systems MSC.Patran and MSC.Marc. As a result of the study an optim…
In this paper, we present the theoretical analysis on how the wavelength of the localized surface plasmon resonances of gold nanoparticle can lead shift for the resonance wavelength. In our results, we calculate the scattering cross-section, the absorption cross-section and the field enhancement due to the nanoparticl…
For operating under outer space conditions besides providing originally specified protective function, coating should often ensure accomplishment of functional properties, for instance conductivity of electric current. The solution of this problem can be reached by adding powder fillers with specified functional prope…
X-ray absorption fine structure (XAFS) has been studied at the K-edge of copper in copper(II) mixed ligand complexes, having tetramethylethylenediamine (tmen) as one of the ligands, viz., Cu(tmen)(gly)ClO 4 , Cu(tmen)(bipy)(ClO 4 ) 2 and Cu(tmen)(phen)(ClO 4 ) 2 . The spectra have been recorded at the dispersive XAFS…
The plasmodynamic synthesis was conducted in the electric hypervelocity pulse jet of carbon-silicon electric discharge plasma influenced on a copper target in an argon atmosphere. Some samples of a powder product with a high content of β-SiC were produced. The results of the experiments made at different levels of sup…
Hydroxyapatite and its compounds are important and promising inorganic biomaterials that can be used in dentistry and bone surgery due to its biocompatibility with the bone tissue of a living organism. The paper presents the synthesis of carbonate-substituted hydroxyapatite powders and studies their morphology, physic…
The problems related to the construction of multi-level mathematical models of inelastic deformation of crystalline materials based on crystal plasticity are considered. The example of the two-level model for description the severe plastic deformation of fcc polycrystals is discussed. The issues relating to the descri…
The possibility of aromatic petroleum resin liquidphase oxidation was investigated. The influence of various factors on the modification process and properties oxidized samples was studied. The optimal parameters of the oxidation processes with hydrogen peroxide using interphase catalysis mechanisms, with peracetic ac…
Using Co35Ni35Al30 (at.%) single crystals the effects of crystals axis orientation and ageing at 673 K for 0.5 h in free state on superelasticity responses in compression are investigated. Ageing of these single crystals is found to result in strengthening of the high-temperature В2 phase and L10 martensite, twofold i…
Here we report that ethylene-derived multi-walled carbon nanotubes (MWCNTs) can be successfully used in the “as prepared” form for the synthesis of Pt/MWCNTs catalysts in aqueous solutions without the need in special wetting agents or specific treatments. The MWCNTs strongly accelerate the hydrolysis of metal precurso…
In last years, the carbon nanotubes have been studied as an advanced metal catalyst support for proton exchange membrane fuel cell. This study focuses on the sonochemical treatment of multi walled carbon nanotubes (MWCNTs) as a platinum supporting material for proton exchange membrane fuel cell (PEMFC) by mixture of s…
The paper shows the effect of butylenes concentration in feedstock on the process of dehydrogenation of butane into butylenes using chromia-alumina-potassium catalyst. Butylenes as contained 1 to 7 % wt. in butane slip completely without hindering the process of converting of butane.
The batch removal of copper (II) from aqueous solution under different experimental conditions using silicon-organic sorbent poly[N,N’-bis(3-silseskquioxanilpropyl)thiocarbamide] (PSTM-3T) was investigated in this study. This sorbent was produced from the hydrolytic poly-condensation reaction. The removal was favoured…
In this article we provide results on the preparation of starch-based block copolymer with polyacrylic acid by radical polymerization. Starch was pregelatinized and then reacted with acrylic acid in the presence of radical polymerization initiator. Resulting mixture was used to prepare cast-films. Structure of the pol…
Exothermic reaction in thermite charge of casting pattern was investigated by estimated and experimental techniques. Thermophysical properties of steel mouldings production in graphitic shell molds were determined.
Low temperature longitudinal magnetoresistance measurement in pulsed laser deposited undoped ZnO film has been investigated. The temperature and magnetic field dependence of the resistivity of the film is in good agreement with the theory of weak localization and electron-electron interactions in a disordered system.…
In this paper we propose novel techniques of ceramic shell mold production with lost-wax method of cast as well as technological methods aimed at fracture strength improvement. The distinguishing characteristic of application of these molds is the possibility to use them without buckling agent resulting in decrease of…
The Fe-core/carbon-shell nanopowders are excellent platform for covalent grafting of biomolecules. The large-scale synthesis of Fe-core/carbon-shell nanoparticles via electropulse erosion of metal precursors in hydrocarbons was developed. The green fluorescent protein was covalently attached to the powder surface via…
In present paper principles of acoustic scattering in case hardened components were discussed. Improvements of ultrasonic testing method and instrument development opportunities were proposed. Through these investigations, it would be possible to provide an advanced method of ultrasonic testing of case hardening quali…
Various clothes treatments during their manufacture and wear change the fabrics physical and surface characteristics. The different testing methods for fabrics quality evaluation are used in this research. The aim of this work is to examine the effect of enzyme treatment, laundering and abrasion on the appearance of d…