Materials Literature
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Submerged arc welding (SAW) is a process in which welding joint is obtained by heating the metal with an arc set between bare electrode and work piece. Intense heat produced during the process fuses the metal and filler metal. Flux is used as a shielding agent which is placed over the welding area to protect the molte…
The ultrasonic properties like ultrasonic attenuation, sound velocity in the group VIB transition metal diborides like CrB2 and MoB2 have been studied along unique axis at room temperature. The second- and third order elastic constants (SOEC & TOEC) have been calculated for these diborides using Lennard- Jones potenti…
Abstract Two new co‐crystals based on 1,2,4,5‐benzenetetracarboxylic acid, (H2BETC)(H4tpim)](NO3) (1) and [(H4BETC)0.5(H2BETC)0.5(HVB4)](H2O) (2) [H4BETC = 1,2,4,5‐benzenetetracarboxylic acid, Htpim = 2,4,5‐tri(4‐pyridyl)‐imidazole, and VB4 = adenine], were synthesized and characterized by elemental analyses, IR spect…
With aim of the simplification of the layers incorporation in the electrolumonescent cell can be superposed the emission layer (unsaturated rare earth elements complex), electronic conduction layer (1,10 -phenanthroline) in one macromolecule.Сopolymers of 2-methyl-5-phenylpentene-1-dione-3,5 with styrene in ratio 5:95…
The dependences of density and static dielectric permeability of water solutions of polyethylene glycol-600 on temperature and polyglycol concentration are studied. It is found that the maximum in the dependences of dielectric permeability on solvent composition is due to intermolecular interactions between water and…
A one-pot synthetic approach for the preparation of poly(2,6-dimethyl-1,4-phenylene oxide)/polystyrene (PPO/PS) alloy in aqueous medium was developed. The method was based on the combination of the oxidative coupling polymerization of 2,6-dimethylphenol (DMP) to form PPO in the presence of a reactive swelling agent, s…
Irradiation of MoO3 films (with a thickness d = 5–54 nm) with light (λ = 320 nm, I = (1.5–7) × 1015 quantum cm−2 s−1) led to the formation of an absorption band at λ = 870 nm along with the shift of the edge of the absorption band to the short-wave region of the spectrum. Further irradiation of the samples with light…
The polycrystalline La 0.1 Lu x Bi 0.9-x FeO 3(x = 0, 0.01, 0.03, 0.05, 0.1 and 0.2) compounds were synthesized by a conventional solid-state reaction method. An unusual exchange bias-like (EB-like) phenomenon was found in this system. Both horizontal shift (Hs) and vertical shift (Ms) are observed simultaneously. Mor…
Applications of top-surface photodetectors Optical detection encompasses a vast number of applications, including optical communications, remote sensing, spectroscopy, and metrology. A major part of the sensor market is associated with imaging applications, hence image sensors have become ubiquitous. This has largely…
This paper reports a method for producing α-Al2O3 at low temperature, which uses a seeding technique. White precipitate of aluminum hydroxide, which was prepared with a homogeneous precipitation method using aluminum nitrate and urea in aqueous solution, was peptized by using acetic acid at room temperature and then t…
A ternary Cu-Hf-Al amorphous thin film with excellent corrosion resistance was successfully synthesized using DC magnetron sputtering method. Electrochemical behaviors of the Cu-Hf-Al films have been studied in four different corrosive media (NaCl, KCl, Na 2 SO 4 , and H 2 SO 4 solutions). According to the annealed sa…
A new approach for consideration of the self-heating modes during monomolecular exothermic reaction has been proposed. The analysis of reactions in the phase plane heating rate and temperature enables detection of the variety of modes of the heating processes and allows consideration of two dimensional parametric mode…
The influence of Na2TeO3 additive in sulphate–citrate bath on electrodeposition of Zn–Mn alloy coatings was investigated by material characterisation methods and electrochemical techniques. The effects of small amounts (0·39–3·10 mM) of Na2TeO3 additive on cathode polarisation, composition and current efficiency were…
Abstract The sharp strength recession of silicate cement in high temperature is the crucial reason of casings damage and zonal isolation failure in heavy oil thermal recovery. Although aluminophosphate cement has a better high temperature resistance in comparison with silicate cement, its compressive strength recessio…
The influence of phosphate bath chemistry on phosphate coating properties and, eventually, on corrosion resistance properties of electrophoretic (ED) painted steel samples was examined. Two types of zinc phosphate bath chemistry with different concentration of zinc and nickel ions, and different values of total acid,…
In this work, the metallic element Ru is introduced into hydrogenated amorphous silicon (a-Si?:?H). The structural and electrical properties of the films doped with Ru have been investigated. Raman spectra reveal that the addition of Ru further disarranges the intrinsically disordered amorphous network and generates m…
The facile synthesis of microcrystalline polyacrylic acid (PAA) gels via emulsion polymerization is presented and the effects of experimental factors that determine the microcrystallization of PAA microgels were investigated. Both reaction temperature and emulsifier type play important roles in the crystallization of…
The strength of the nonlinear optical effects in silicon–nanocrystal waveguides can be varied as required for applications by altering the geometry of the waveguide and the composition of its nonlinear core. By studying theoretically the geometric and composition dependencies of the mode overlap factors responsible fo…
We have investigated the effect of post-deposition annealing on the composition and electrical properties of alumina (Al2O3) thin films. Al2O3 were deposited on n-type Si <100> substrates by dc reactive magnetron sputtering. The films were subjected to post-deposition annealing at 623, 823 and 1023 K in vacuum. X-ray…
An analytical model is suggested and the numerical modeling of energy release under the effect of neutrons in microvolumes of VLSI active elements allowing for the effect of surrounding materials is performed. The developed model for evaluating the sections of local radiation effects shows satisfactory agreement with…