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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 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.
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 05 Oct-Nov-Dec 2014
Issue 14 Oct-Nov-Dec 2017
Issue 15 Apr-May-June 2018
Issue 09 July-August-September 2016 The Creation Of Fluid And Gas Mechanics Basis In The Micro-Cracked Channel R.S. Gurbanov, M.A. Mammadova, A.A. Hajiyev There are experimental investigations of the fluids flow in the small-sized channels, the hydraulic resistances results of which are more than the estimated ones according to theoretical formulas and different supposed explanations without the quantitative evolution have been given in the reference. Taking into consideration this situation in the mechanics we were conducted the experiments in special developed unit with different fluids: water, viscous and anomalous oils. The results of the numerous experimental investigations for deter- mining new effect of fluid mechanics in the micro-cracked channels have been given in this work. Firstly the experimental-estimated methodology in the “micro-crack fluid” system has been proposed and realized for the quantita- tive estimation of the hydraulic resistances. This approach allows to conduct hydrodynamic engineering estimations for fluids flow in the fractured-porous medium, in the mechanical engineering, in the lubrication systems of instrument engineering and also for solutions of the sealing problems in different branches of industry and medicine. Multi-Criterial Estimation Of The Level Of Corrosion Damage Of The Gas-Pipeline Areas In The Ambiguous Expert Opinions S.A. Aghammadova The linguistic model has-been developed for the estimation of the corrosion damage level of the gas-pipeline areas in the optimistic and the pessimistic expert opinions of the influencing factors. For solving of the given task generalization of the method of multi-criterial choice of the best alternative in the case of rules of fuzzy productions has been chosen, antecedents and consequents of which have been by fuzzy sets with multi-semi functions of belonging. Wavelet Method For Solving Problems Of Unsteady Fluid Filtration In The Crack-Porous Ring Type Formation O.A. Dyshin Based on the multiple-scale analysis in L^2(R^3) using discrete wavelet transform with separable orthonormal basis we’ve developed a method of sustainable approximate calculation of the classical solution of the initial-boundary value problem of unsteady fluid filtration in the crack-porous ring-type formation. The problem is reduced to solving ill-posed problem of finding the solution of linear polynomial equation given inaccurate data, when the approximate solution constructed by regularization method is stable with respect to error in differential equations ratios and boundary conditions set up, as well as set up right member falseness. Decision Making In The Multi-Criteria Problems Of Alternatives Using The Bayesian Interval Inference Methods R.F. Hajiyeva The Bayesian inference method is used in the decision process of the multi-criteria problems using the strength of information on the product rules. Using these mechanisms the point and interval estimates of the posterior probabilities are built on their prior probabilities, derived from the composite aggregation rules of the alternative description information of the decision-maker preferences defined by a fuzzy expert judgements. These decision logic is applied to the problem of selecting a candidate on the vacant faculty position in university Comparative Analysis Of Trading Systems Performances With Respect To Transaction Cost 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 06 Jan-Feb-Mar 2015 Physical Mesomechanics And Spectrum Of Metal Surface Layer Excitation At Friction Process With Heavy Loading A.Kh. Janahmadov, N.G. Javadov The paper reviews the physical mesomechanics of structurally inhomogeneous media, developed on the verge of continuum mechanics (macro-level) and physics of plasticity and strength of deformable solids (micro-level). According to the concept of the structural level of deformation, at friction the surface layer of deformable solids is an independent leading functional subsystem. It is shown that with an increase of the deformation level of material, it develops autonomous processes (plasticity waves) inside, which have a significant impact on the staginess of plasticity flow localization and the destruction of contacting bodies, at the meso-level the deformation has a transitional-rotational character. Influence Of Wingtips On Induced Drag Force Of Rectangular Wing R.M. Jafarzade, M.H. Ilyasov, J.N. Huseynli The paper examines the influence of wingtips on the inductive resistance of rectangular wing through the mathematical model based on the distribution of vortices. Assuming that the free vortices originate at the wingtips – the imaginary Π-shape vortex diagram is built above the wing at the height of wingtips. The air is considered to be incompressible. Referring to the Biot-Savart formula, the expression for the inductive velocity, generated by the free vortices, and their average values along the wingspan are found. The induced drag force and its co- efficient are determined through the average bevel angle of flow. The inductive drag force is analytically proven. Application Of Coordination Polymers To Increase The Reservoir Oil Recovery B.T. Usubaliev, E.E. Ramazanova, F.T. Murvatov, E.N. Aliyev, Y.S. Salakhova, M.K. Munshieva, F.B. Aliyev, A.K. Rzaeva It is first time when an application of composite materials, BAF-1 BAF-2, on the basis of the co- ordination polymers is studied to improve the rheological properties of crude oil. It has been established that composite materials reduce the oil viscosity by 60-70% and also have a positive effect on other properties. Relaxation Of The Non-Equilibrium Field Effect In In2O3-SiO2-Si-SiO2-Al Structures At The Non-Equilibrium Depletion Regimes A.Z. Badalov, Sh.G. Zeynalova The article studies in detail the effect of various factors on the screening time of In2O3-SiO2- Si-SiO2-Al structures, the influence of the lighting temperature, and the supply voltage on the duration of the non-equilibrium non-stationary depletion process. It is also examines the dependence of the current depolarization on the power supply impulse duration with and without exposure to the LED light. The Theoretical Analysis Of Crude Oil Vapour Pressure And Cavitational Technologies Studying Of Physical And Chemical Properties Of Transported Oil In The Course Of Cavitation S.K. Gezalov We have worked out the criterion of fuzzy interval for minimizing target function with fuzzy coefficient. The given criterion shows adaptability of genetic algorithms for building pare-to-optimal solutions of multi-objective problem of transport logistics with fuzzy coefficient of objectives.
Issue 13 July-Aug-Sept 2017 Armenian Terrorism in Nagrono-Karabakh Azerbaijan First Scientific Discovery Azerbaijani Manat, its History and Origin Upcoming Birthdays Tribological Aspects of Physical Mesomechanics A.M. PASHAYEV, A.KH. JANAHMADOV, N.G. JAVADOV, M.Y. JAVADOV Experimental Research of Transducer for Measurement of Concentration of Hydrogen in Gas Mixtures A.A. SAFAROVA Efficiency of Offshore Gaspipelines E.Kh. ISKANDEROV Pricing Asian Options with Monto Carlo Method E.A. JANAHMADOV