European Researcher. Series A

1990-2002

Authors: Vladimir N. Chuvil’deev, Vladimir I. Kopylov, Aleksey V. Nokhrin, Olga E. Pirozhnikova

The article presents the results of theoretical analysis of non-equilibrium grain boundaries diffusion properties recovery during ultra-fine grain (UFG) materials annealing, produced by severe plastic deformation (SPD) method. The paper proves that activation energy and grain boundary diffusion coefficient of UFG materials depend on density of defects, cumulated by grain boundary during SPD. Annealing causes diffusion redistribution of defects in grain boundaries, which results in diffusion properties change. Diffusion properties recovery rate depends on grain size and it is much higher in UFG materials than in coarse-grained materials.

2012-2016

Authors: Aiman E. Konkabaeva, Gulmira M. Tykezhanova, Rakhat T. Bodeeva, Akerke J. Sadykova, Sultan A. Kusherbaev

The article presents the results of the study of heart rate variability (HRT) in apparently healthy volunteers of both sexes without bad habits, aged 16-18, residing in industrial region (Temirtau) and the ones, studying under innovative technologies. HRT was registered with the help of computer-controlled devices “Varikard” (Russia). The changes of HRT spectral indexes towards integral impact of vegetative regulation mechanisms and parasympathetic activity decrease and regulatory systems overexertion, demanding correction methods implementation.

2023-2030

Authors: Valery V. Rozhentsov

The article offers the method for evaluation of mental fatigue, based on the method of paired light pulses. Ten pre-trained test men with normal vision, aged 18–20 participated in the experiment. Testees were showed subsequent paired light pulses at a 200 ms interval, divided by initial interpulse interval of 70 ms, recurring at the fixed time interval of 1 s. Testees determined the threshold interpulse interval, at which the two pulses in a pair merged into one, three times, using the method of successive approximation. Then testees solved algebraic equations with several unknowns for two hours. The threshold interpulse interval was determined three times every 20 minutes in the course of equations solving. The degree of mental fatigue DMF was calculated, using the formula: DMFi = (TPIi – TPI0) 100% / TPIi; i = 1, 2, … , n, where DMFi is the degree of mental fatigue at the i-th measurement; TPIi is average arithmetic duration of threshold interpulse interval at the i-th measurement; TPI0 is average arithmetic duration of threshold interpulse interval before algebraic equations solving; n is the dimension of threshold interpulse interval measurement in the course of algebraic equations solving. After 20 minutes of work, the degree of mental fatigue of one of the testees was 9.5 %, rose to 21 % by the end of the first hour and exceeded 39 % by the end of the second hour. Similar dynamics of mental fatigue was observed in all testees, but its development and the degree of fatigue are individual. To prevent fatigue and ensure high level of efficiency one should set the individual schedule and rest pauses duration during mental activity.

2039-2043

Authors: Svetlana М. Yatsun

The article deals with the mathematical modeling of biological diagnosis of complex heterogeneous structure (skin), using non-destructive control method. The mathematical model, describing interaction of the material with electrodynamic vibration generator and sensor system, controlling the propagation of small disturbances was developed. The influence of material model parameters on the spectrum in the course of the propagation of the surface disturbance.

2057-2065

Authors: Normahmad Ravshanov, Bozorboy Palvanov, Yuldash Islamov

The work develops mathematical model and computing algorithm to analyze, project and identify the basic parameters of filter units operation and their variation range. On their basis, numerical analytic solution of the problem of ionized liquid solutions filtering was obtained. Computing experiments, resulting in graphic format were presented. Analysis of calculation results enables to determine the optimum modes of filter units operation, used in liquid ionized solutions filtration technology, in food preparation, in drug production and for drinking water purification. Selection of the most suitable parameters contributes to the improvement of economic and technologic efficiency of production and filter units operability.

2071-2078

Authors: Sofiya V. Zherebchuk

The article attempts to analyze historiography and sources of ASEAN and EU interaction, characterizes the features of interaction of the mentioned integration groups. Relations with EU have special place in ASEAN international contacts, basing both on the fact that EU is one of the key economic partners of the Association and the specific character of interaction between the leading regional integration alliances. The analysis of the documents enabled to estimate the major directions of today’s cooperation between the leading integration alliances more precisely and determine the possible prospects.