Materials Literature
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Gemini surfactants, butanediyl 1,4-bis(dimethyl cetylammonium bromide), pentanediyl 1,5 - bis (dimethyl cetylammonium bromide) and hexanediyl 1,6 - bis (dimethyl cetylammonium bromide) from Alkanediyl-α, ω-bis (dimethyl cetylammonium bromide) series were synthesized in laboratory and were characterized by using Nuclea…
For the production of steels with high quality standards is essential to know accurately the different sources that generate inclusions, in order to optimize the steelmaking practices and to minimize their frequency. The use of tracer elements in the slag has shown an effective tool to determine the origin of inclusio…
Generating energy from renewable sources is not an easy task since it requires different types of technologies, which can add much cost to the system. For this reason, investment in research in this area can be an alternative for economic feasibility of wind power plants, for example. One line of research in this area…
Hydrocyclones are devices worldwide used in mineral processing for desliming, classification, selective classification, thickening and pre-concentration. A hydrocyclone is composed by one cylindrical and one conical section joint together, without any moving parts and it is capable of perform granular material separat…
The present work analyzes the tribological behavior of surface modifications often used in cold rolling mill rolls. Different surface modifications were carried out on samples produced from a fragment of the rolling mill roll: i) texturing; ii) chromium plating; iii) texturing with subsequent hard chrome plating; iv)…
The serious geotechnical problems arising in many tunnels bored in material giving rise to stability problems as a result of being expansive, makes the water channelizers. These are materials which are easily washed with sulphates dissolving with water causing the massif to become decompressed and to remould, aggravat…
This work has been focused on the investigation of the technological procedure of Mudejar mortars applied to the characterization of a group of unaltered samples from an example church of Mudejar architecture of Aragon. The research was carried out using multi-analytical techniques including petrographic study, chemis…
We present the experimental evidence for the presence of spinodal decomposition of the magnetic ions in the Ge1-x-y CrxEuy Te samples with chemical composition varying in the range of 0.015 x 0.057 and 0.003 y 0.042. The ferromagnetic transition at temperatures 50 T 57 K was observed, independent of the chemical compo…
The remote voltage annunciator – the device developed for detecting dangerous voltage at the specific workplace, in the high voltage supply units, in the electric traction networks, and catenaries – is described. The remote voltage annunciator scheme for the high-voltage AC-operated equipment is described. The annunci…
The effect of the die hole configuration in the screw extruder on the pellet quality of the fish formula feed is considered. The results of the corresponding theoretical and experimental research are presented. The surface form of the die hole that allow to produce uniform pressure of the pressable material throughout…
Functions and role of the epistemological optimism, its place in the modern disciplined inquiry are considered in view of ecological safety problems. The impact it produces on the process of building up a contemporary scientific view of the ecological stability on our planet is also described. Basic concepts of the en…
The polemics relative to the applicability of the ‘Dutch disease’ term to the Russian economy is described. The dynamics interdependence of such indicators as oil price, labour productivity, and mineral output is considered. The negative impact of the oil price increase on wages that affects the number of oil workers…
The formulation technique for the asymptotically exact coupling conditions simulating a thin section under the analysis of transverse vibrations of the cantilever fitted rod is presented. The three-piece beam model with constant characteristics in every area is investigated. An exact analytical solution produced from…
A problem on the formulation of the limit set for the sequences of increasing Toeplitz matrices eigenvalues (of the limitary spectrum) with the chosen symbol is solved. The limitary spectrum of the banded Toeplitz matrices is described as a semialgebraic set, viz a solution set of some system of algebraic equations an…
The metal recovery goes from 0,4 up to 0,95 under the machine waste reclamation by the powder metallurgical techniques. Energy costs on the article production decrease. Under separating the slime produced in steel parts grinding, the promising approach is the liquefaction of dispersed ferromagnetic materials in the ma…
The problem of increasing the efficiency of cache systems using artificial intelligence techniques is considered. The formalized statement of raising the cache effectiveness on the basis of the set-theoretic mathematical tools is described. The fuzzy logic application technology for determining the victim which implem…
The results of the gender analysis of the educational process in the engineering university are presented. The gender analysis is made in stages, and it is defined by the well-structured diagram. Within the frame of this research, the gender analysis appears a constituent of the gender strategy of the engineering univ…
At the present stage of the Russian economy development, education in its extricable connection with science and production accommodates the efficiency and competitiveness of the national economy. In consequence of the interaction of the scientific research, design departments of the industrial enterprises and leading…
This article contains information about the availability of trade warehouses, dynamics of regional development defined stages of storage systems, commercial and technological process design, goals and objectives.
Some issues on the mathematical model justification and the solution to the problem of the labour safety risks assessment at the machine building enterprises are considered. As a result, the phases of occupational hazards threat, and the conditions which may result in workers death, injury, or disease, are discovered.…