Effect Of Dynamic Characteristics of Power Supplies on Aerosol Composition While Welding With Coated Electrodes

In the context of a significant increase in production output and use of welding technologies in the manufacturing of engineering products the problem of hygienic characteristics of working conditions in arc fusion welding is becoming increasingly important. The work represents how the dynamic characteristics of a power supply affect the transfer of alloying elements from a coated electrode into a base metal, a slag phase and a solid component of welding fumes

Functional plasma sprayed coatings on magnesium ceramic substrates.

© Published under licence by IOP Publishing Ltd.The possibility of improving the quality of the titanium articles using ceramic molds with improved surface layer. The improvement is achieved by reducing a porosity of by plasma sprayed Al2O3

Improving Hygienic Characteristics of Coated Electrodes for Welding High-Alloy Steels

The article presents the results of experimental studies showing that the use of an inverter power supply instead of a diode rectifier provides:: fine-droplet electrode metal transfer which reduces generation time by 46% and transfer time by 28%; transfer of alloying elements from welding materials into the weld metal which reduces its loss from the welding line by 6% and the heat affected area by 3%; reducing the emission rate of welding fumes and their components by 23%; reducing specific emission of welding fumes and their components by 23%

Step-Down dc-dc Converter for Low Temperature Plasma

© 2018 Institute of Physics Publishing. All rights reserved. This paper presents a step down converter with a high speed rectifier and filter for Argon plasma torches. Buck circuit with a high frequency pulse width modulation control and very fast MOSFET transistor were used for switching. For Argon (Ar) gas Plasma Torches, and by increasing the pulse width, the average output voltage has modified from 80 V up to 100 V. The frequency of the designed step down converter was steady at 20 KHz

Experimental setup for plasma treatment of disperse materials in the arc plasma jet

The experimental setup for the plasma treatment of particulate materials was created. Spend the processing of composite powder of chromium oxide with aluminium oxide

Is dermatoglyphics an object of scientific research or not?

The versatility of human nature implies a great difficulty in its comprehending and determines many methods and approaches to its study. Dermatoglyphics is one of such methods, that studies the structure of the skin patterns of palmar and plantar surfaces of the hands and feet. This article reviews data related to finger dermatoglyphics informativity in various scientific disciplines. Dermatoglyphic patterns are formed under the influence of environmental factors and polygenic hereditary factors. Signs of papillary patterns are also determined by polygenic factors that are inherited from parents. Like any hereditary traits, they can mutate. Mutations and hereditary diseases accompanied by damaging of the genetic code, as a rule, manifest in the phenotype and in the characteristics of dermatoglyphs. Informativity and lability of dermatoglyphic pattern allows to use it as a factor – indicator of susceptibility to a particular disease with hereditary component. Currently, in sports genetics, dermatological markers of the fingers are also widely used to determine individual predisposition to a certain motor activity and sports talent. Study of combinations of types of patterns of dermatoglyphic characteristics of the toes, as well as the analysis of finger and plantar lines, types of dermatological patterns of the foot, allows using the foot dermatoglyphics as the additional marker of a genetic predisposition to a particular sport. As a constitutional marker the dermatoglyphics has prerequisites for predicting manifestations of a person’s individuality in all its diversity of physical, physiological and mental properties. Attempts to identify the informativity of finger dermatoglyphics in the field of professional selection were made earlier by representatives of various sports

Development of the setup for study of the gas ionization in the pulsating mode of combustion

© 2018 Institute of Physics Publishing. All rights reserved. At present, known methods of direct conversion of the chemical energy of gaseous fuels to electrical energy are not so effective. This work is directed to developing the setup for experimental study of the gas ionization processes in the pulsating mode of combustion. This problem being solve for the first time. As result, schematic diagram and methodological recommendations will be developed which will be subsequently used for experimental studies

Yb-Yb correlations and crystal-field effects in the Kondo insulator YbB12 and its solid solutions

We have studied the effect of Lu substitution on the spin dynamics of the Kondo insulator YbB12 to clarify the origin of the spin-gap response previously observed at low temperature in this material. Inelastic neutron spectra have been measured in Yb1-xLuxB12 compounds for four Lu concentrations x = 0, 0.25, 0.90 and 1.0. The data indicate that the disruption of coherence on the Yb sublattice primarily affects the narrow peak structure occurring near 15-20 meV in pure YbB12, whereas the spin gap and the broad magnetic signal around 38 meV remain almost unaffected. It is inferred that the latter features reflect mainly local, single-site processes, and may be reminiscent of the inelastic magnetic response reported for mixed-valence intermetallic compounds. On the other hand, the lower component at 15 meV is most likely due to dynamic short-range magnetic correlations. The crystal-field splitting in YbB12 estimated from the Er3+ transitions measured in a Yb0.9Er0.1B12 sample, has the same order of magnitude as other relevant energy scales of the system and is thus likely to play a role in the form of the magnetic spectral response.Comment: 16 pages in pdf format, 9 figures. v. 2: coauthor list updated; extra details given in section 3.2 (pp. 6-7); one reference added; fig. 5 axis label change

STUDY OF HYDROPHILIC-HYDROPHOBIC PROPERTIES OF N-[3-(DIETHYLAMINO)ALKYL](METH)ACRYLAMIDES IN THE WATER-HEXANE SYSTEM

A classification of amphiphilic monomers based on the partitioning properties was performed. Partition coefficients were calculated for six amine-containing (meth)acrylamides. Dependence of the partition coefficient on a monomer structure was shown

Development of methods for the preparation of radiopure ⁸²Se sources for the SuperNEMO neutrinoless double-beta decay experiment

A radiochemical method for producing 82Se sources with an ultra-low level of contamination of natural radionuclides (40K, decay products of 232Th and 238U) has been developed based on cation-exchange chromatographic purification with reverse removal of impurities. It includes chromatographic separation (purification), reduction, conditioning (which includes decantation, centrifugation, washing, grinding, and drying), and 82Se foil production. The conditioning stage, during which highly dispersed elemental selenium is obtained by the reduction of purified selenious acid (H2SeO3) with sulfur dioxide (SO2) represents the crucial step in the preparation of radiopure 82Se samples. The natural selenium (600 g) was first produced in this procedure in order to refine the method. The technique developed was then used to produce 2.5 kg of radiopure enriched selenium (82Se). The produced 82Se samples were wrapped in polyethylene (12 μm thick) and radionuclides present in the sample were analyzed with the BiPo-3 detector. The radiopurity of the plastic materials (chromatographic column material and polypropylene chemical vessels), which were used at all stages, was determined by instrumental neutron activation analysis. The radiopurity of the 82Se foils was checked by measurements with the BiPo-3 spectrometer, which confirmed the high purity of the final product. The measured contamination level for 208Tl was 8-54 μBq/kg, and for 214Bi the detection limit of 600 μBq/kg has been reached.</p