Intensifying removal of particulate contaminant from hydrocarbon feedstock with a magnetic field

The effect of a constant magnetic field on hydrocarbon feedstock of different natures was investigated. The effect of magnetic induction on the size of disperse particles was established. The effectiveness of the magnetic field on treatment of hydrocarbon feedstock to remove particulate contaminants was demonstrated.     

Iron and copper complexes with nitrogen-containing ligands as catalysts for cyclohexane oxidation with hydrogen peroxide under mild reaction conditions

Oxidation of cyclohexane (CH) with hydrogen peroxide under mild reaction conditions in the presence of systems containing in situ generated iron complexes with nitrogen-containing ligands (2,2??-bipyridyl and o-phenanthroline) and chlorinated (Cl15) copper phthalocyanine (CuPcCl₁₅) have been studied. It has been shown that in water-acetonitrile blends under optimum conditions, CH is oxidized with the formation of cyclohexanol, cyclohexanone, and acids involving cyclohexane hydroperoxide. High total selectivity for ketone and alcohol is reached in the excess of ligands and the substrate.     

Development of the technique of clustering by acoustic emission signal parameters

The technique of clustering by a set of parameters of acoustic emission (AE) signals, which allows reducing the time of processing of the recorded data, is considered. A comparative analysis of the stability of three clustering techniques (by shape, leading edge rise rate, and a set of AE signal parameters) with respect to the effect of random noise distributed according to a normal law is performed. A possibility of using the considered clustering techniques for distinguishing different stages of duralumin specimen fractures and during welding of steel specimens is experimentally demonstrated.     

Study of fracture of specimens made of fiberglass plastic using acoustic-emission and strain measurements

The crack resistance of specimens made of a fiberglass plastic composite material has been studied. All specimens had approximately the same geometric dimensions. At the center of the specimens, there were 25-mm-long notches on both sides. The specimens were loaded with a static or cyclic load at a frequency f = 5 Hz. The tests were performed using acoustic-emission (AE) and strain gage measurements. The AE technique allowed stable localization of a flaw at an early stage of growth and made it possible to automate the measurement process. The strain gage measuring system was used to find deformations in the zones of localization of AE signals.     

Dynamics of the formation of pulsed transverse nanosecond discharge with prolate slot-cathode

Experimental studies of the spatial-time dynamics in formation and evolution of nanosecond plasma-beam discharge with a prolate slot-cathode in inert gases is investigated using a high-speed camera. Features and regularities in the dynamics of evolution of nanosecond discharge with the slot-cathode are established depending on the external conditions. As it has been shown experimentally, the first registered optical radiation of the discharge arises near cathode surface and the discharge formation starts simultaneously at the cathode slit output and between the electrodes.     

Vitamin B12 and C accumulation in the organs and tissues of laying hens administered ascorbic acid in their diet]

An addition to the basic ration of laying hens of the white leghorn breed of 0.1 to 2.0 g of ascorbic acid per 100 g of fodder raised the ascorbic acid content in the kidneys, heart and comminuted meat of the test animals. Feeding on ascorbic acid contributed to a higher content of the vitamin B12 in comminuted meat and in the egg yolk, this bearing evidence to the existance of an interrelation between the vitamins B12 and C.     

Microwave Absorption Studies on Superparamagnetic Conducting Nanocomposites as Signal Coating Materials

In this paper, preparation and characterization of superparamagnetic nanoparticles and their polymer composites prepared by varing doping level of conducting polymer and their microwave absorption studies at radar system in 8–12 GHz frequency range have been discussed. These composites are conducting polymers have been widely used because of their lower density as well their good environmental stability as in the case of polyaniline (PAN). In the present work, in situ polymerization of aniline was carried out in the presence of 30 mole% Fe₃O₄ nanoparticles to synthesize polyaniline/Fe₃O₄(PAN/Fe₃O₄) composites in epoxy resin matrix. The composites, thus synthesized have been characterized by infrared (IR) spectroscopy and X-ray diffraction. The morphology of these composites was studied by scanning electron microscopy. The measurement of % absorption was carried out in X and K band microwave region.     

Electric properties of (SiC)<Subscript>1 − <Emphasis Type="Italic">x</Emphasis></Subscript>(AlN)<Subscript><Emphasis Type="Italic">x</Emphasis></Subscript>/SiC anisotropic heterostructures

The heterostructures of p-(SiC)_{1 − x} (AlN) _x / _n -6H-SiC are synthesized by means of sublimation epitaxy of (SiC)_{1 − x} (AlN) semiconductor solid solutions at 6H-SiC substrates. The results of the investigation of the concentration and temperature dependences on current-voltage characteristics (CVCs) are presented. It is revealed that due to the high potential barriers the forward current is caused by the tunneling and recombination processes of charge carriers via states at the boundary surface.