Issue 12 April-May-June 2017

Issue 08 April-May-June 2016 Optimization Of Technological Processes For Machine Parts And Equipment Operating in Extreme Conditions A.M. Gafarov, P.G. Suleymanov, V.A. Gafarov The paper reviews the aspects of optimization of the technological processes for high-precision machine parts and equipment operating in extreme conditions. The obtained results are analyzed. Ratio Of Power Indicators In The System "Drilling String – Drive" B.A. Perminov, V.B. Perminov, Z.H. Yagubov, E.Z. Yagubov In the mode of drilling a well, transmission of rotation the drill string, occur from the wellhead to the bottom hole. Thus, at the expense to the impact dissipative forces on the drill string in the bore-hole may be stop of some part column, twisting of stretched portion and stall bottom of column with accelerate of rotation after accumulating a sufficient level of potential energy. The stock of potential energy in the elastic column at the rotation of upper part the greater, the more moment of resistance of stationary portion column. Take place redistribution of power indicators along the length of the drill string, that engender relaxation oscillations in the column, to the disruption of the dynamic balance, as condition of the column, so and system "drill string – drive", violates the dynamic stability of column and leads to a forced harmonic changes power of the drive of engine rig. In this regard, the definition of conditions for the occurrence of relaxation oscillations in the system “drill string – drive” is a very urgent task. Work is devoted to research of the power indicators of the drill string in the drilling operation and the definition of the necessary conditions for maintaining the dynamic equilibrium of the system. It was shown that the accumulation of potential energy in the bottom of the column is more than the kinetic energy of the upper part always provokes relaxation oscillations in the system. Makes recommendation, that to enhance the dynamic stability of the work regime is necessary increase the moment of inertia of the drive of column and reduce the weight of the bottom hole of column. Integrated Mechanisms For Data Security And Reliability In Information Systems Based On Theoretical Coding Schemes Kh.N. Rzaev The paper examines the cryptographic data protection to ensure the security of the data transfer through the means of information systems. The author carried out the comparative studies on the integrated security mechanisms to provide the reliability of transferred data by using the McEliece and Niederreiter (asymmetric) crypto-systems based on the m-tuple error-correcting codes. Application of Water-Flooding Method to Improve The Potential Oil Recovery D.A. Volchenko, G.F. Miralamov, V.R. Roznyi The paper examines the water-flooding method to improve the potential oil recovery by adjusting the properties of reagents in the water solution. Effect Of Abnormal Oil On Performance Of Well Bottom Zone T.Sh. Salavatov, I.I. Kirdoba, M.A. Dadashzadeh The article studies in detail the effect of various factors of the abnormal oil on the performance of well bottom zone.

Issue 10 October-November-December 2016 Assessment Of Material Strength Properties Of One Scale Level Transferred From Test Data At Another Level A.M. Pashayev, A.Kh. Janahmadov, M.Y. Javadov The paper examines the forecast methods of failure process dynamics at one scale level based on parameters defined at another level. The industrial forecast methods were developed suited for engineering practice. The specific scale levels of fracturing are considered on the basis of the dynamic process characteristics and the space-time approach. Space-Time Scale Invariance At Dynamic Fragmentation Of Quasi-Brittle Materials N.G. Javadov, M.I. Aliyev The paper examines the fractured quasi-brittle materials and the scale invariance with respect to time and space variables. It confirms that the large-scale clustering in the ensemble of defects, accompanying the transition from the dispersed to the microscopic resolution, have the signs of phenomena that is characteristic to non-equilibrium critical systems. It demonstrates that with respect to the quasi-brittle materials, the dissipative ability is associated with the scenarios of formation and interaction of the multi-scale collective defect modes in conditions of the specific type of the critical events – the structural scaling transitions. Nano-Tribological Processes At Electric Discharge Of Discrete Ohmic Contacts Of Metal-Polymer Pairs A.Kh. Janahmadov, A.I. Volchenko, E.S. Pirverdiyev The paper examines the nano-tribological processes at the electrical discharge in the discrete ohmic contacts of the metal-polymer pairs of tribosystem. The nature of destructive processes in the polymeric film of pads is explained. Adjusting The Starting Pressure Of Gas Lift Well To The “Switching Lifting Device Of The Reverse Valves System” O.H. Mirzayev The results of starting pressure change by switching injection direction of working agent from circular annulus to the central part in gas lift wells have been given. The valves are placed on the pipe surface in definite depth under liquid column. As a result of investigation it has been determined that the application of the method in the wells with big depth and high liquid column gives an opportunity to reduce starting pressure. Application of the method in complicated exploitation conditions gives effective results. Comparative Analysis Of Trading Systems Performances With Respect To Transaction Cost (Part 2) E.J. Janahmadov The purpose of this paper is to compare and analyze the performance of trading rules applied to the underlying and derivative products. Three different trading market indictors were chosen from the range of trading rules according to their performance relatively to Dow Jones Industrial Average. On the basis of these technical indicators the automated trading systems were developed and then applied to the underlying instrument such Dow Jones Industrial Average. The performances of trading systems and profit/loss indexes were compared and analyzed. The results are compared with “buy-and-hold” strategy and performance of underlying security. The results of the research intend to show the effect of the transactions costs on the performance of trading systems and optimal could be applied to invest into underlying or derivatives of underlying.

Issue 01 Oct-Nov-Dec 2013 The Multi-Fructural Analysis Of Fatigue Failure Under Friction Process A.M. Pashayev, A.Kh. Janahmadov, O.A. Dyshin, M.Y. Javadov The article shows the need to combine approaches of synergetics and fractals in the study of friction and wear in the frictional contact, due to fact that dissipative structures, self-organising in the open systems, are known to have a fractal behaviour The multi-fractal concept allows to introduce new quantitative structures, characterised by a spectrum of generalised fractal dimensions and reflected by the degree of randomness. Different levels of structure (micro-, mesa- and macro-scale) are described in the framework of multi-fractal analysis. A procedure to calculate the multi-fractal dimension of this structure is developed and the results of the numerical calculations are submitted.Research Of Loading Distribution On Coils Of Running Pair Of The LatchN.H.JavadovIt is given the calculation procedure of distribution of pressure on coils of running pair of latch at various loading schemes. Recommendations are provided for the choice of loading schemes of running pair, which ensures more uniform distributions and therefore, considerably reduces the wear of coils by means of constructive changes in a latch. Modeling And Forecasting The Financial Markets Using Theory Of Deterministic Chaos And Fractals S.M. Javadova This paper presents the results of the multi-fractal analysis based on the wavelet transformation, which can be considered as method of studying the spectral correlation properties of various processes, including non-stationary. Comparative experience with methods MFFA (multi-fractal fluctuation analysis) and WTMM (wavelet transform modulus maxima) in studying of the multi-fractal properties of signals of time function shows that MFFA method is more reliable and robust.As an instrument of the ‘local’ study of time function structure, WTMM allows to evaluate the correlation properties of random processes in comparison with a short signal. Surface Structures Of Frictional Materials On Asbestosfree Base M.I. Aliyev Development of asbestosfree composite materials on petroleum coke base enabled to obtain environmentally sound products with sufficiently high physical, mechanical and tribotechnical characteristics. The materials have been analyzed/tested from the perspective of physicochemical friction mechanics in the breaking mode through the differential-thermal analysis (DTA) and thermogravimetric analysis (TGM), supplemented with the study of friction materials structure. The thermogravimetric analysis findings indicated that decomposition of the new asbestosfree friction material begins after 14 minutes at 3000C.

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