Aerobic Oxidation of a Naphtene–Paraffin Concentrate in the Presence of Reduced Graphene Oxide

The aerobic oxidation of a naphthene–paraffin concentrate extracted from a mixture of Azerbaijan oils is studied. The reduced graphene oxide (powdered, pelletized) is used as the reaction catalyst. It is shown that reduced graphene oxide exhibits a fairly high catalytic activity in the liquid-phase oxidation of the naphthene–paraffin concentrate to petroleum acids. It is assumed that the catalytic activity of reduced graphene oxide can be attributed to the structural defects and specific electronic structure of this material. The liquid naphthene–paraffin concentrate with graphene as a catalyst is a dispersion with microparticles, the “hydrodynamic diameter” of which varies in the range of 1–3 µm and significantly changes after oxidation.     

On one class of model optimization problems with a continuum of solutions

We consider critical sets of an H-regular functional. We propose a condition under which the set of all critical points forms a critical set. We discuss several problems that lead to such sets and show a connection with the notion of Morse index. As examples we consider integral functionals for functions defined on a segment.     

Specific features of the capacitance–voltage characteristics of a Cu–SiO<Subscript>2</Subscript>–<Emphasis Type="Italic">p</Emphasis>-InSb MIS structure

The capacitance–voltage and conductance–voltage characteristics of InSb-based MIS structures are measured at different probe signal frequencies with the aim of studying the influence exerted by the technological-synthesis conditions on the capacitive properties of these structures. The influence of positive charge built into the insulator on the sample characteristics is discussed. This influence manifests itself as a sharp capacitance “switch” upon changing the polarity of a low-field (E < 10⁶ V/cm) external signal.     

Formation of ternary compounds in thin As<Subscript>2</Subscript>Se<Subscript>3</Subscript>-Yb<Subscript>1 − <Emphasis Type="Italic">x</Emphasis></Subscript>Sm<Subscript><Emphasis Type="Italic">x</Emphasis></Subscript> films

This paper examines the formation of ternary compounds in films produced by sequential and simultaneous evaporation of As₂Se₃ and Yb_1−x Sm _x from two sources. Crystal data and deposition conditions are presented for Yb_{1 − x} Sm _x As₂Se₄, Yb_{1 − x} Sm _x As₄Se₇, and Yb_{1 − x} Sm _x AsSe₃. In films, these phases form at lower temperatures in comparison with bulk samples.     

The effects of laser patterning 10CeTZP-Al2O3 nanocomposite disc surfaces: Osseous differentiation and cellular arrangement in vitro

Customized square grid arrangements of different groove depths (1.0, 1.5 and 3.0?µm) and separations (10 and 30?µm) were successfully laser patterned, using a nanosecond pulsed fibre laser, on the surface of 10?mol% ceria-stabilized zirconia and alumina (10CeTZP-Al₂O₃) nanocomposite discs (diameter: 10?mm; thickness: 1.5?mm). The patterned surfaces and the in vitro biological response of osteoblasts (SAOS-2) towards them were thoroughly analysed. In terms of composition, the laser treatment was found to cause superficial monoclinic-tetragonal zirconia phase transformation and alumina evaporation. In vitro, the most effective grid configuration for osseous differentiation was found to be 1.5?µm groove depth and 10?µm groove separation, and confocal microscopy revealed that the cells show a tendency to be sorted as groove depth increases. It is thought that custom-made patterns could be produced to guide cell attachment in vivo, which could favour implant integration and reduce healing time.     

Some features of combustion of aluminothermic mixtures

Alma-Ata. Translated from Fizika Goreniya i Vzryva, Vol. 28, No. 1, pp. 46–51, January–February, 1992.     

Dependence of the Surface Morphology and Structure of CuIn0.95Ga0.05Se2 Films on the Selenization Temperature

Semiconductors - Depending on the choice of the technology for producing CuInxGa1&nbsp;–&nbsp;xSe2 films, a spread in the electrophysical and photoelectric parameters of...     

On the photoconductivity of TlInSe<Subscript>2</Subscript>

The current–voltage (I–V) and photocurrent–light intensity (I _pc –Φ) characteristics and the photoconductivity relaxation kinetics of TlInSe₂ single crystals are investigated. Anomalously long relaxation times (τ ≈ 10³ s) and some other specific features of the photoconductivity are observed, which are explained within the barrier theory of inhomogeneous semiconductors. The heights of the drift and recombination barriers are found to be, respectively, E _dr ≈ 0.1 eV and E _r ≈ 0.45 eV.