Materials Literature
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The results of the creep tests with extension and torsion of tubular specimens made of D16AT and AD1 aluminum alloys, which were earlier obtained at the Institute of Mechanics, Lomonosov State University, were analyzed theoretically. Experimental data obtained with the author’s participation imply that a sharp increas…
Silicon is an important material for technical applications. Recently, a long-puzzling metastable phase of silicon (T12-Si) has been theoretically identified. In this work, we used first-principles calculations to study the electronic and elastic properties and the hardness of this new silicon allotrope to enrich the…
To prepare the flexible and stretchable electromagnetic shielding (EMS) fabric with environmental stability, this paper uses polytrimethylene terephthalate (PTT) fabric as substrate, the aniline monomer as raw material, hydrochloric acid (HCl) as the doping agent, ammonium persulfate (APS) as the oxidant to produce po…
In subsea oil and gas systems, microalloyed steel linepipes are welded to low alloy steel (e.g. 8630) forgings using dissimilar fillers, such as alloy 625. Post-weld heat treatment (PWHT) is necessary to temper the heat affected zone (HAZ) and relieve residual stresses. During PWHT, carbon diffuses from the forging in…
This paper presents the implementation of an antenna beam former using tensor transmission-line (TL) metamaterials. Unit cells exhibiting both isotropic and anisotropic effective material parameters are utilized in the design. The beam former produces a uniform power density and a uniform phase profile at its output.…
Most materials will expand upon heating, while rare ones contract. Such negative thermal expansion materials have great potential in controlling thermal expansion composites. Squeeze casting was used to fabricate fully dense 60 vol.-%Y2W3O12/Al composite in this study. The results showed that negative thermal expansio…
Nanobiotechnology is an emerging field in biotechnology and it has vast applications in all fields. In this study silver nanoparticles has been synthesized by using Cassia fistula leaf extracts which was confirmed by using UV and FT-IR.The structure and size of synthesized nano materials was confirmed by using SEM and…
The pilot experiments on methyl ethyl ketone (MEK) synthesis in 2005–2006 were aimed at developing a technology for highly selective n-butylene oxidation with oxygen into MEK in the presence of a new homogeneous catalyst. This catalyst was a chloride-free aqueous solution of Pd(II) + HPA-7′, where HPA-7′ is a vanadium…
A method for analysis of the formation of backscattered electron scanning electron microscope (SEM) images is described. The results of studying the formation of SEM signals obtained upon scanning an angular structure are given. The mechanisms of the formation of images in the modes of backscattered and slow secondary…
The influence of a thick epitaxial buffer layer on the magnetic properties of thin perovskite manganite films was studied. The deposition of a thick LaNiO3buffer on single-crystal (001) LaAlO3substrate shifted the magnetic anisotropy of a thin La0.7Sr0.3MnO3toward the sample plane, while maintaining its saturation mag…
The ZnPc molecules in the thin film prepared by Langmuir-Blodgett (LB) process in asdeposited state has been found to have an edge on orientation with average tilt angle of 64.3 ° as confirmed from the Pressure-Area (π-A) isotherm and X-ray diffraction (XRD) study. The ZnPc LB thin film has been observed to have abnor…
Summary The scientific and industrial field of hybrid organic‐inorganic polymer systems (HOIS) is widened in recent years due to possibility of combination of various organic and inorganic building blocks and obtaining hybrid materials with novel characteristics. The aim of the present paper is to develop the knowledg…
In recent years, many researches focused on the polymer materials to study the characteristics and to enhance the mechanical properties of the nanocomposites in order to understand the factors which lead to the desired dispersion of nanoclay in the polymer matrix. The samples used in this work were prepared through me…
Electrodeposition from solutions based on Cr(III) compounds of composite chromium coatings with denotation nanodiamond (DND) particles and composite coatings (CCs) of silicon dioxide-DND obtained using the sol-gel method is studied. Physicomechanical properties and composition of these composite coatings (CCs) are inv…
Two-dimensional disordered granular assemblies composed of 2048 polydispersed frictionless disks are simulated using the discrete element method. The height of the first peak of the pair correlation function, g1, the local and global bond orientational parameters ψ6l and ψ6g, and the fluctuations of these parameters d…
Abstract Artificial siderophore–Fe3+ complexes were prepared and modified with Au nanoparticles. These nanoparticles were found to selectively adsorb onto microbes and initiate selective aggregation. The aggregation of microbes leads to the amplification of the detection sensitivity when measured using siderophore-mod…
Single wall carbon nanotubes (SWCNTs) were exposed to gamma irradiation in oxidative (H 2 O, NH 4 OH) and reductive (H 2 O and NH 4 OH both mixed with isopropyl alcohol) media. The structure has been investigated with microscopic (atomic force and transmission electron microscopy), spectroscopic (Raman, X-ray photoele…
Magnesium alloys are widely used in various fields. However, their electromagnetic interference (EMI) shielding effectiveness (SE) was rarely reported. In this work, the electrical properties and EMI SE of Mg–xZn (x = 0–5 wt-%) alloys in as-cast, T4 and T6 states were investigated. The SE value was measured in the fre…
In this paper, light absorption spectra properties of a bimetal multilayer nanoshell based on quasi-static approach are investigated. Comparing with silver-dielectric-silver and silver-dielectric-gold nanoshells, gold-dielectric-silver nanoshells have three intense and separated plasmon peaks which are more suitable f…
New biologically active hybrid chitosan–silicone-containing glycerohydrogels based on chitosan and silicon glycerolates were synthesized by a sol–gel method; the effect of silicon glycerolates and chitosan concentrations on the process of gel formation was evaluated.