Modelling Industrial Catalytic Reforming of Lowoctane Gasoline

Chemistry and Technology of Fuels and Oils - Naphtha reforming is one of the most important industrial processes in refineries. The products include aromatic hydrocarbons such as benzene, toluene,...     

Actual Trends in the Application of Rare-Earth Metals and Their Compounds in the Production of Magnetic and Luminescent Materials: A Review

Russian Journal of Non-Ferrous Metals - Current trends in the application of rare-earth metals (REMs) in two major scientific and technological fields—the production of magnetic and...     

Use of Chemical and Electrochemical Treatment Methods in the Liquid-Phase Modification of Carbon Fiber and Fiberglass Surfaces in the Production of Construction Materials: A Review

Theoretical Foundations of Chemical Engineering - In this review, the key methods used in the chemical and electrochemical functionalization of carbon fiber and fiberglass are considered. It is...     

Stabilization of the Design Loading Characteristics in the Problems of Durability Estimation of Tracked Vehicle Parts

For a reasonable and reliable assessment of durability at the design or operation stage of the tracked vehicles, it is required information about the loading process. For a reliable assessment of loading and, consequently, durability, the question arises about the representative length of the loading process recording. The paper proposes a method for determining the necessary and sufficient realization length. The efficiency of the proposed method is demonstrated by the example of the evaluation of the random loading processes in torsion shafts of the suspension systems of a high-speed tracked vehicle. The justification of the necessary and sufficient length of the record of the random loading process is given.     

Electroless deposition and investigation of composite coatings based on nickel or cobalt matrix,including boron nitrides as dispersoids,on polyethylene terephthalate substrate

Composite coatings, based on nickel or cobalt matrix with incorporated boron nitride particles (BN) as dispersoid, have been chemically deposited and investigated. The mass, and relative thicknesses, of the obtained composite coatings, as well as the number of co-deposited particles, depending on the type (alpha boron nitride – BN(h) or cubic boron nitride – BN(c)) and particle size of the dispersoid, as a function of dispersoid concentration in the working electrolyte and the concentration of the reducing agent in the plating electrolyte have been determined. The morphology, structure and chemical composition of the deposited coatings have been characterised by means of SEM and EDS analysis.     

Ga2O3 films formed by electrochemical oxidation

The effect of oxygen plasma on gallium oxide films formed by electrochemical oxidation of n-GaAs wafers with a donor concentration N _d = (1–2) × 10¹⁶ cm⁻³ has been investigated. It is shown that the treatment in an oxygen plasma at a temperature of 50–90°C increases the concentration of β-phase crystallites, which causes an increase in the permittivity, a decrease in the dielectric dissipation factor, and a change in the conductivity of GaAs-〈gallium oxide〉-metal structures.     

Effect of coal rank on the composition of organic matter (Short Communication)

It was demonstrated that the ratios between the fractions of carbon and hydrogen in CH₃, CH₂, and CH groups regularly changed in the coal metamorphism series.     

Impurity Atoms on Small Transition Metal Clusters. Insights from Density Functional Model Studies

We review our computational studies at the DFT level on small isolated metal clusters of late transition metals that contain atomic (H, C, O) or diatomic (CO, N₂) ligands. These investigations were initiated by the clarification of the structure of iridium and rhodium clusters, as characterized by EXAFS, and then were extended to clusters of other transition metals (Ni, Ru, Pd, Os, Pt). The results suggest that a single H atom hardly changes the structure of a small metal cluster, while the presence of O and C impurity atoms causes large variations in the metal?Cmetal distances. The adsorption of single atoms results in a partial oxidation of the metal moiety, yet addition of an atomic impurity only moderately modifies the electronic properties of small clusters, whereas stronger modifications of the properties are caused when the charge of the metal cluster is varied. The dissociative adsorption of larger amounts of hydrogen, up to 6 H₂ molecules, on metal tetramers causes an elongation of the (average) inter-metallic distances, bringing them close to the experimental values. This body of computational results can be helpful for elucidating the structures of experimentally observed species and for rationalizing their electronic and catalytic properties.     

Preparation of nanostructured materials through thermolysis of metal chelate complexes

We demonstrate that nanocomposites (metals and metal carbides and sulfides) can be produced by thermolysis (370 and 600°C) in a self-generated atmosphere using Cu(II), Co(II), and Ni(II) 2-hydroxy- and 2-N-tosylaminobenzaldehyde azomethine bis-chelates as precursors.     

Current Characteristics of Ionizing Radiation Fields of the IBR-2 Reactor’s Irradiation Facility for Researching Materials’ Radiation Resistance

Instruments and Experimental Techniques - The current characteristics of the ionizing radiation fields of an irradiation facility intended for studying the radiation resistance of materials on...