Materials Literature
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A method of accounting for the symmetry of interaction energy of N identical atoms in terms of the theory of elastic constants has been proposed. The energy symmetry group of the cluster is G N = O(3) ⊗ P N . It has been shown that the calculation of elastic characteristics of crystals, which is based on analyzing the…
Carlgieseckeite-(Nd), ideally NaNdCa 3 (PO 4 ) 3 F, a new mineral species of the belovite group of the apatite supergroup, was found at the Kuannersuit Plateau, Ilimaussaq alkaline complex, South Greenland. It is associated with albite, analcime and fluorapatite in cavities of an albite vein cross-cutting augite syeni…
Duplex stainless steels (DSSs) are based on the Fe-Cr-Ni system and formed by ferrite (30-70%) and austenite. They have high tensile strength, good toughness and weldability and excellent corrosion resistance including stress-corrosion cracking and resistance to localized corrosion. The increase of the raw materials o…
A preparation of well-dispersed magnetite nanoparticles was demonstrated in this study. Magnetite nanoparticles (MNPs) were synthesized by a hydrothermal method using aloe vera extract and serial centrifugation was employed to separate the sizes of well-dispersed particles. Well-dispersed MNPs with average sizes of 24…
Hibiscus sabdariffa (Roselle) stem fiber was graft copolymerized and further used to explore the additive effects of secondary monomer in binary vinyl monomeric mixture. The graft copolymers were characterized by advanced techniques, like FTIR and SEM, and evaluated for morphological transition by X-ray powder diffrac…
In this paper, description of the technique and calculation data on the precision of vacuum ion-plasma spraying of GTE parts coatings are presented. We developed an algorithm and a program that make it possible to calculate the out-of-roundness of parts at different positions of a plasma source with due regard for par…
Zinc nitride films were prepared by RF magnetron sputtering a metallic zinc target in NH 3 —Ar mixture gases on glass substrate at room temperature. The effects of NH 3 ratio on the structural and optical properties of the films were examined. X-ray diffraction (XRD) analysis indicates that the films are polycrystalli…
This paper reports on the long term performance of water tight cables produced in Saudi Arabia subjected to accelerated aging. In this context, two types of water tight constructions were designed and implemented under the same production conditions. The first type was a completely water tight cable while the other wa…
The syntheses of the three new guanidine-quinoline hybrid ligands TMGmqu, DMEGmqu and TMG t bqu are reported. Zinc chlorido and triflato complexes with these ligands were obtained and structurally characterised by X-ray crystallography. In the chlorido complexes the zinc atom is coordinated by two chlorido ligands and…
The secondary emission of thin films of the 2D-ordered linear-chain carbon (LCC) with a thickness of 100 nm are studied using transmission measurements at various energies of primary electrons. It is demonstrated that the coefficient of secondary emission of the LCC films substantially depends on the extraction field…
Optical metallography, scanning and transmission electron microscopy, and microhardness measurements have been used to layer-by-layer study the structure of an artificially aged Al-4 wt % Cu alloy subjected to loading by spherically converging shock waves. It has been established that the high-strain-rate plastic defo…
The structure and physical properties such as magnetization, heat capacity, and dielectric constant of the polycrystalline Ba3NbFe3Si2O14 have been studied in detail. It is found to be structurally similar to the single crystal and also has a similar antiferromagnetic transition at TN∼26 K. The heat capacity measured…
CdS nanosheets of thickness 0.6 nm were grown within the interlayer spaces of Na-4 mica. Magnetization measurements carried out in the temperature range 2–300 K showed the composites to have weak ferromagnetic-like properties even at room temperature. The saturation magnetization (MS) at room temperature was found to…
We describe the photophysical properties of heterodimers that are formed by the free base 2-(2-carboxyvinyl)-5,10,15,20-tetraphenylporphyrin and the zinc complex of 5-( p -aminophenyl)-10,15,20-triphenylporphyrin and that are covalently bonded by the amide link. These dimers differ in the configuration of the double b…
Fe 3 O 4 magnetic nanoparticles (MNPs) were obtained using the gas condensation method. These MNPs were modified with 3-aminopropylsilane (APS) through covalent bonding. The methods of qualitative and quantitative analysis of the modified MNPs were developed using UV and IR spectroscopy and inductively coupled plasma…
Operation impact on endurance performance in GST-based phase change memory is investigated from small arrays to large test chips. SET operation induced electromigration and phase segregation are observed. For the first time, the RESET melting healing effect is proposed to partially repair the SET induced damage and fu…
This article provides data on the parameters of carbon mass loss obtained within the framework of a complete thermochemical model of its destruction, and comparison of them with similar data for the case of consideration of carbon oxidation in the diffusion approximation. The findings are compared with the correspondi…
Tellurite glasses of varying Er3+/Nd3+ concentration were successfully prepared by melt-quenching method. The X-Ray diffraction pattern was determined by using Siemens Diffractometer D5000 while the optical properties were measured using Shimadzu 3101 pc UV-VIS NIR scanning spectrophotometer. It was found that the dif…
Hydrogen is the major flammable gas observed in the dome space of each million-gallon radioactive waste storage tank at the U.S. Department of Energy Hanford Site. Semiempirical rate equations are derived to estimate hydrogen generation based on chemical reactions, radiolysis of water and organic compounds, and corros…
The dielectric properties of poly (ethylene-co-butyl acrylate) with 13 wt% of butyl acrylate (EBA) filled with alumina nanoparticles were studied as a function of particle size, particle coating, filler content (2, 6 or 12wt%) and temperature. The particles were either unmodified or surface-treated with either aminopr…