bluuebunny/crossref_metadata_2025 huggingface dataset:
Inpatient dermatological referrals in a tertiary care hospital
Authors: Raikar Dayanand R. , Manthale Nagendra S. , Raikar Shrinivas R.
Published: May 2017

Background: It is not surprising that patients hospitalized on nondermatology inpatient services are frequently found to have skin problems and present as a source of confusion for their admitting physicians. Aims and Objective: To analyse the reasons for dermatology referrals and its frequency, departments sending the referral and the impact on health care management.

Methods: We conducted a study on 464 patient referrals over a 4‑year period. The demographic details, specialties requesting consultation, cause of referral, and dermatological advice have been recorded and analyzed.

Results: Unspecified “skin rash” was the most common dermatologic condition for which skin referral was sought. The final diagnoses made by dermatologists revealed infections as most common skin disorder. Almost 48% of the patients referred as “skin rash” were diagnosed to be suffering from infectious disorders. The referring doctors could provide an accurate dermatological diagnosis only in 32% of cases.

Conclusions: Most of the nondermatologists fail to diagnose common skin disorders. This reveals need for more trained dermatologists to combat this problem and more extensive dermatological training for the medical students.
Varied cutaneous manifestation of chikungunya fever: a case series
Authors: Chavan Ravindranath B. , Salunke Aarti S. , Belgaumkar Vasudha A. , Bansal Neelima M. , Tharewal Sweta S.
Published: May 2017

Chikungunya fever (CF) has recently re­emerged as a major public health problem of global scale. It is characterized by an acute onset of high fever associated with severe disabling arthritis, vomiting, sore throat and often with prominent cutaneous manifestations. The disease is usually self-limiting, but the joint symptoms and some cutaneous features may persist after defervescence. Various cutaneous changes have been described in association with CF. We report a case series of ten patients presenting with pigmentation (over face, palm, sole, knuckles, fingers) and vesiculobullous lesions which were diagnosed as chikungunya rash based on of clinical and serological investigation.
Azathioprine induced anagen effluvium: a rare case report
Authors: Sharma Saurabh , Budhiraja Ravika K. , Bassi Roopam
Published: May 2017

Anagen effluvium occurs due to an agent or event that drastically reduces the metabolic activity of the matrix cells of the hair follicle. At any given time more than 80% of scalp hair is in the anagen phase of the hair cycle. Hence the resulting hair loss is abrupt and extensive. In majority of the cases, it occurs in association with cancer chemotherapy and radiation, other causes being rare. Here we report a case of a middle aged female suffering from Atopic dermatitis that was put on treatment with Azathioprine for the same. Treatment with Azathioprine was followed by a diffuse and extensive hair loss from the scalp associated with painful oral ulcers and marked leucocytopenia within a month of administration. The hair grew back within four months of stopping Azathioprine. This case report is an attempt to highlight a rare but extremely distressing side effect of Azathioprine which is a commonly used drug in dermatology.
Method of pipeline system designing taking into account complex interaction of static and dynamic processes with strength characteristics
Authors: Mironova T. B. , Prokofiev A. B. , Rodionov L. V.
Published: May 2017

A method of pipeline system designing is presented in the paper. It takes into account the complex interaction of static and dynamic processes with strength characteristics. The method is designed for aircraft pipelines, as well as for those of power plants and mobile transport and industrial process pipelines.
Thermophysical properties of multilayered structures
Authors: Rapilbekova N. S.
Published: May 2017

The developed methods make it possible to estimate the accuracy of certain proposals for analytical calculations of integral thermophysical characteristics of multilayered composites. For that purpose, the results of precise calculations of a multilayered structures thermal state are compared with the results of calculating a homogeneous body with indicated thermophysical characteristics. This comparison makes it possible to assess the applicability of analytical dependences for describing integral thermophysical characteristics of multilayered composites.
Flame propagation velocity and ionization in burning gasoline and methane with addition of hydrogen
Authors: Shaykin A. P. , Ivashin P. V. , Galiev I. R.
Published: May 2017

The paper is devoted to the effect of adding hydrogen to CNG and gasoline on the electrical conductivity and the speed of the flame front. It is shown that the ion current in the CNG is determined by the mass fraction of carbon and the speed of the flame front propagation.
Mechanisms of interaction of charged microparticles with the discharge electrode of the injector and the mass spectrometer target
Authors: Syomkin N. D. , Vidmanov A. S. , Bragin V. V.
Published: May 2017

The paper deals with the mechanism of interaction between charged microparticles and the mass spectrometer target. Experimental data on measuring the ion flow parameters in case of high-speed impact of the charged particle are presented. The contribution of the charged particles potential and kinetic energy to the ionization of the mass spectrometers target matter is assessed.
Choice of parameters of meshing using estimates of conditionality
Authors: Avdeev E. V. , Fursov V. A.
Published: May 2017

The paper shows the dependence of matrix condition indicators and multicollinearity indicators on the dimension of the original problem mesh. Examples from an open integrated platform for the numerical simulation of continuum mechanics OpenFOAM tasks are given. The behavior of conditionality indicators and that of the diagonal dominance indicator are shown to be the same. An example of determining mesh dimensions with the help of the diagonal dominance indicator is given.
Method of confocal laser fluorescence microscopy for the control of bone marrow cells
Authors: Zakharov V. P. , Volova L. T. , Timchenko P. E. , Timchenko E. V. , Boltovskaya V. V. , Rossinskaya V. V.
Published: May 2017

The paper shows the use of confocal laser microscopy for the assessing of viability of mesenchymal bone marrow stromal cells of a rabbit with the resolution of 400 nanometers. A three-dimensional structure of cells is obtained by this method.
Formation of light balls on the basis of interference of oncoming fine-focused beams with different polarizations
Authors: Khonina S. N. , Ustinov A.V.
Published: May 2017

The paper deals with the formation of spherical intensity distributions on the basis of the interference of oncoming fine-focused vortex beams with different polarization. The formation of three-dimensional distributions is accomplished in a simple way by optimizing the width and position of a single annular diaphragm. The optimum parameters are analytically estimated for a narrow ring aperture, while those for a broad diaphragm are further numerically corrected. It is shown that, depending on the polarization, the order of the vortex singularity and an additional phase advance in one of the beams both solid and hollow light balls of a subwavelength radius consisting of different components of the electric field can be formed.
Contribution of the all-russian research institute of aviation materials to space exploration (1950-1980)
Authors: Bannikova N. F.
Published: May 2017

An attempt is made in the paper to identify and present the main areas of the institutes theoretical and experimental development of new kinds of steel, alloys, and materials for the developing space industry. The most important results of the research carried out by the Institutes specialists and scientists for space-rocket engineering are presented.
Model of economic cooperation between an air carrier and airport structures
Authors: Titov B. A. , Kropiventseva S. A.
Published: May 2017

The paper deals with the factors affecting the economic performance of an air carrier, airport and airport structures. The target functions of the carrier and the service company are defined. A model of economic cooperation between the air carrier and airport structures is proposed.
Current state of the theory and practice of circuit wiring control and testing of the avionics of rocket fairings of middle-class launch vehicles
Authors: Koptev A. N. , Gulyaev A. A.
Published: May 2017

The paper presents an existing technology of controlling circuit wiring and tests of rocket fairings of middle-class launch vehicles. The essential features required of modern control systems of circuit wiring and tests of middle-class launch vehicles are formulated. Аn overview of the automated microprocessor control system MASKA is presented and the possibility of using it for the testing of the avionics of rocket fairings of middleclass launch vehicles is shown.
Method of calculating self-capacitance in planar structural elements of a spacecraft
Authors: Syomkin N. D. , Bragin V. V. , Pomelnikov R. A. , Balakin V. L.
Published: May 2017

The paper presents a methodology for calculating distribution of potentials based on the triangulation method of plane approximation, surface method and analytical determination of the matrix elements of Coulomb interaction. The results obtained demonstrate good agreement with the experiments on the electrization process in small spacecraft AIST.
Assuring the durability of transport aircraft structure in multipurpose use based on the results of endurance and flight tests
Authors: Fomichev P. A. , Kleptsov V. I.
Published: May 2017

An approach is proposed to determine the durability of transport aircraft wing structure in multi-purpose use. Relationships are obtained for durability calculations based on fatigue test results depending on typical flight profiles and their relative flying time in service. Dependences are obtained for the calculation of damages within the framework of the known discrete model of atmospheric turbulence. The possibility of refining the fatigue damage calculation using the experimental cumulative probability of flight overload increment is shown. Applying to Be-200ChS aircraft, the fatigue damage in firefighting flights obtained from flight test data was found to be 2.75 times greater than the value calculated by the known method.
Experimental research of wall boundary flow formation in the combustion chamber of a small gas generator with self-igniting fuel components
Authors: Shustov S. A.
Published: May 2017

The paper presents a method of experimental investigation of physical processes taking place in the formation of a wall boundary flow. The object of investigation is described. The results of the experimental research are presented. They are related to such parameters as changes in the thickness, temperature and phase composition of the wall boundary flow. The results of comparing the thickness of the wall boundary flow and that of the boundary layer along the combustion chamber are given.
Analysis of ablation process method errors for the definition of the temperature profile of high-temperature gas flows
Authors: Shustov S. A.
Published: May 2017

The paper presents the analysis of ablation process method errors for the definition of the temperature profile of high- temperature gas flows. The main sources of the ablation process method errors are revealed on the basis of physical processes taking place when a high-temperature flow moves around a body. Numerical evaluation of each error source is given.
Research of growth rate of fatigue cracks in aluminum AK6 alloy depending on tension characteristics in the field of their progress
Authors: Aistov I. P. , Vansovich K. A. , Kruchkov A. N.
Published: May 2017

The common growth criterion of fatigue cracks is offered for different degree of the biaxial tension. The specimen tension is investigated. Influence of biaxial loading on growth rate of a fatigue crack and its connection with a triaxial coefficient of a tension which can be calculated in an environ of a crack top is install.
The influence of design and performance parameters of an angular ball bearing on the stiffness of gas turbine engine rotor supports
Authors: Balyakin V. B. , Zhilnikov E. P. , Barmanov I. S.
Published: May 2017

The paper deals with the influence of a radial bearing clearance, frequency rotation, as well as radial and axial forces on the displacement and stiffness of a ball bearing. The influence of the bearing stiffness on that of the support is assessed.
Investigation of energy parameters of small-thrust liquid rocket engines with the geometric expansion ratio of the nozzle F=200
Authors: Ageenko Y. I. , Nigodyuk V. E. , Ryzhkov V. V. , Sulinov A. V. , Shustov S. A.
Published: May 2017

The paper presents the results of theoretical and experimental studies carried out to determine the energy parameters by the example of small- thrust liquid rocket engines with the nominal thrust in a vacuum of 50 N on unsymmetrical dimethylhydrazine and nitrogen tetroxide fuel components with the nozzle geometric expansion ratio F=200.
Formation of microvortex gas flows in channels of a block catalyst with coplanar channels
Authors: Knysh Y. A. , Tsibizov Y. I. , Dmitriev D N. , Gorshkalev A. A.
Published: May 2017

The paper deals with the formation of vortex cores and improving the efficiency of an oxidation catalyst. A new design of a catalytic unit is presented. Hydrodynamic calculations and experimental analysis of microvortex currents in the channels of the catalyst are presented. The goals and objectives for future work are identified.
Mathematical model for calculating radial non-uniformity of the gas temperature field at the exit of small gas turbine engine combustion chambers
Authors: Lukachev S. V. , Abrashkin V. Y. , Lansky A. M. , Matveev S. G.
Published: May 2017

The paper is devoted to the problems of constructing a model of radial non-uniformity of the gas temperature field (GTF) at the outlet of the combustion chambers of small gas turbine engines (SGTE). Correlation regression dependence for assessing the influence of structural and operational parameters on the characteristics of the temperature field at the outlet of SGTEs is obtained.
Test benches for researching the processes and operational development of low emission gas turbine engine combustion chambers
Authors: Markushin A. N. , Baklanov A. V.
Published: May 2017

The paper presents a range of test benches that form the base for researching gas dynamic processes the processes of mixture and combustion in the burner of a gas turbine engine combustion chamber, as well as benches for testing full-size combustor chambers both separately and as part of the engine. This base is necessary for the production and optimization of low emission gas turbine engine combustion chambers.
Influence of the turbine ignition, flame tube suspension and nozzles on the combustion chamber characteristics
Authors: Matveev S. G. , Orlov M. Yu. , Zubrilin I. A.
Published: May 2017

The paper presents a mathematical model of the working process of a gas turbine engine combustion chamber that makes it possible to take into account the effect of the flame tube suspension, ignition and turbine nozzles on the working process of the combustion chamber and to estimate the effect.
Method of reduced fuel characteristics and parameters of the operating cycles of heat engines
Authors: Anastaseev V. V. , Belozertsev S. V. , Mikheenkov E. L. , Nekrasova S. O.
Published: May 2017

Traditionally mass (kg or moles) or volume fractions of substances and products of combustion or other chemical reactions are used in the processes of thermodynamical and thermal calculations. The process of calculation reveals significant differences in properties of the substances in question according to their calorific value and the amount of air required for complete combustion of the fuel. It is difficult to make a generalized analysis of the properties of products of combustion of various substances as working media of the cycle and heat transfer agents in heat exchangers. At the same time the calculation of combustion and design of gas generators using the idea of fuel reduced characteristics are widely used in steam turbine manufacturing. The feasibility of using these possibilities to calculate the cycles of heat engines is analyzed.
Effect of non-uniform compressor flow parameters on the characteristics of a gas turbine engine combustion chamber
Authors: Matveev S. G. , Orlov M. Y. , Zubrilin I. A. , Matveev S. S. , Tsybizov Y. I.
Published: May 2017

A mathematical model of the working process of a gas turbine engine combustion chamber is presented which makes it possible to take into account the residual swirl and radial non-uniformity of the flow velocity at the inlet to the combustion chamber.
Formation of carcinogenic PAHs (polyaromatic hydrocarbons) in the turbulent diffusive flame
Authors: Matveev S. G. , Chechet I. V. , Orlov M. Yu. , Semenov A. V.
Published: May 2017

The paper is devoted to the investigation of forming the PAH spectrum in the process of turbulent diffusion combustion of a propane butane mixture. The parameters that influence the oxidation of hydrocarbons and basic PAHs are generalized in terms of the process of mixing, diffusion, chemical kinetics. Areas of intensive formation of the PAH spectrum are revealed.
The influence of engineering changes on NOx emission in a gas-turbine endine combustion chamber
Authors: Mingazov B. G. , Baklanov A. V.
Published: May 2017

The paper presents a model of calculating nitrogen oxide formation in the combustion chamber of a gas turbine engine. The model has made it possible to make the calculations and determine the characteristics of nitrogen oxide concentration from the total air ratio in combustion chambers with various extents of opening the flame tube head. The processes in the commercial and shortened gas turbine engine combustor chambers are analyzed.
Limit values of the Brayton cycle with the use of reduced fuel characteristics
Authors: Mikheenkov E. L. , Nekrasova S. O.
Published: May 2017

Heat energy of fuels used in cycles is a source of reaching useful effect of the heat engine cycle. The maximum effect of using the fuels can be obtained in the cycles of rocket and aircraft engines since, due to their specific nature, they carry the fuel (as well as the oxidizer in rocket engines) during the whole period of performing the mission. The energy and transport power installations are to use the fuel available in the region and reasonably-priced. Taking the most common Brayton cycle as an example we considered factors that determine the maximum coefficient of heat consumption of fuel in the cycle. Two factors are considered restricting the efficiency of the Brayton cycle efficiency: the maximum permissible limit of the strength properties of materials and the maximum level of fuel combustion products. The values of the excess air ratios in the combustion of fuels and the limiting characteristics of heat engines according to the Brayton cycle are determined. The information on the generalized approach to the assessment of the energy properties of the fuels and the impact of this measure on the Brayton cycle is presented.
Applying the possibilities of Microsoft Excel for solving problems of fuel burning thermodynamics
Authors: Mikheenkov E. L. , Nekrasova S. O. , Ramzaeva E. A.
Published: May 2017

Heat energy obtained from burning fuels is practically the main source of useful effect of the heat engine cycle. To calculate the cycles of heat engines it is necessary to know the temperature and thermodynamic characteristics of the products of combustion that constitute the working substance in the processes of expansion. The solution of the balances of the initial substance masses and those of the masses of products of chemical reactions as well as the power balances of reactions becomes a serious task. In the authors opinion Microsoft Excel spreadsheets that make up the compulsory set of software for Microsoft Office computers and laptops are useful for the development of computational methods of reactions of burning at the stage of training students and engineers.
Test case of 3d unsteady swirling flows modeling using commercial and in-house codes
Authors: Nazukin V. A. , Avgustinovich V. G. , Thornber B. , Aguado Lopez P. , Tsatiashvili V. V. , Koromyslov E. V.
Published: May 2017

The paper gives the comparison of the results of turbulent flow computational modeling in an experimental rig using various software environments: commercial ANSYS CFX software and original Higher-Order Accuracy Codes. The effects of turbulence models and computational grid size on the computation data are evaluated.
Characteristics of the sampling instrument for measuring emissions of an aircraft gas turbine engine
Authors: Okhlobystin A. V. , Lyubimov R. V. , Sokolova N. N.
Published: May 2017

The paper presents the results of the experimental study of the characteristics of the sampler used to measure the emissions of an aircraft bypass engine. The temperature of the sampler and the sample inside it, the pressure difference in the flow of the gas at the sampler inlets are determined, the emission level being measured starting from the idling mode to the take-off mode. The influence of using a vacuum pump on the samplers characteristics is shown. The data obtained are compared with the requirements of the ICAO standard.
CFD-based modeling of oil ang gas journal bearings using commercial software packages
Authors: Pugachev A. O. , Ravikovich Y. A. , Ermilov Y. I. , Kholobtsev D. P. , Matushkin A. A.
Published: May 2017

The paper presents a methodology of modeling fixed geometry journal bearings with gas and oil lubrication. The general CFD package ANSYS is employed to simulate cavitated and turbulent flows. A grid independence study is performed for the oil-lubricated bearing. The CFD predictions are compared with the results obtained by traditional methods (reference books and using the Reynolds equation of lubrication). The discussion of the adequacy of the model is provided.
Simulation of drop coagulations in swirled time dependent streams with reference to gas turbine engine combustion chambers
Authors: Sviridenkov A. A. , Tretyakov V. V.
Published: May 2017

The paper presents a model of fuel drop coagulation with reference to gas turbine engine combustion chambers. Calculations of drop coagulation are carried out at various values of the fuel spray expansion angles and initial drop sizes using the model developed. The values of drop concentrations and their sizes depending on geometrical and performance characteristics of the sprayer are specified. It is shown that the decrease of the fuel spray angle, with the initial drop concentration and their sizes being the same, leads to the shift of the fuel concentration maximum towards larger sizes and increase in drop concentrations.
Analysis of potentialities of coil electromagnetic accelerators for the accelerating of ferromagnetic particles
Authors: Sukhachev K. I. , Syomkin N. D.
Published: May 2017

The paper presents an analysis of coil electromagnetic accelerators. Physical limits on the maximum acceleration imparted to a ferromagnetic body are defined. Mathematical modeling of a single-stage coil electromagnetic accelerator has been carried out including three-dimensional simulation of the particle trajectory. The influence of parameters of traction coils, the initial conditions and the particle material on the final speed is analyzed.
System of pressurization of the fuel tank of a launch vehicle using the heat of generator gas
Authors: Biryuk V. V. , Smorodin A. V. , Shepelev A. I. , Onoprienko D. A.
Published: May 2017

Comparative analysis of heat exchangers of various types is carried out: crossflow, shell- and- tube, plate heat exchangers. Mass- power characteristics of the three types of heat exchangers are calculated.
Ensuring efficient operation of roller bearings
Authors: Grechishnikov O. V. , Balakin A. Y. , Roslyakov A. D.
Published: May 2017

The paper presents some materials to analyze the causes of loss of efficiency of ground- application GTE roller bearings. The factors that influence the temperature of the bearing ring are analyzed. The efficiency of cooling the bearing parts, especially the outer raceway, as well as the heat-stable characteristics and the method of oil supply are shown to have a significant impact on the roller bearing efficiency.
Conditions of compatibility of compressor and turbine used as part of a gas generator required to ensure turbine operability
Authors: Grigoriev A. V. , Ilyushin M. Yu. , Mitrofanov V. A. , Rassokhin V. A. , Rudakov O. A. , Solovieva A. V.
Published: May 2017

The article shows the necessity of matching joint functioning of the compressor and the combustion chamber at the stage of designing a gas generator to provide the turbine operability and specifies the formula for the calculation of the superficial flow velocity downstream the compressor as a matching parameter which, if its value is provided, prevents gas temperature field instability downstream of the combustion chamber and correspondingly prevents the damage of the turbine blades.
The influence of swirling of a flow with axial countercurrent on the process of burning of hydrogenoxygen mix in the stream of water steam
Authors: Guryanov A. I. , Vereshchagin I. M.
Published: May 2017

The paper presents comparative results of the numerical research of the combustion of stoichiometric hydrogen-oxygen mixture in the medium of water steam using various ways of mixing fuel components in the flame tube of a tubular combustion chamber.The geometry of the mixing chamber that makes it possible to achieve the highest values of combustion efficiency and temperature uniformity at the exit of the combustion chamber is defined.
Comparison of mass properties of high- pressure cylinders with cryogenic fill for a throttle cooling system
Authors: Dovgjallo A. I. , Sarmin D. V. , Uglanov D A.
Published: May 2017

The paper presents the results of testing a tank with cryogenic fill (liquid nitrogen) conducted at the level of pressure of up to 4 MPa. The behavior of parameters in the tank, the time and pressure are shown to correspond to the design model.
Estimation of parameters of a pulse detonation engine (РDЕ)
Authors: Anakin A. T. , Tsybizov Yu. I.
Published: May 2017

Тhe article dеals with the estimation of parameters of a pulse detonation engine. Тhe aims and tasks of further research are determined.
Simulation of responses p-n junction to dynamic influences
Authors: Bodnarchuk G. A.
Published: May 2017

The processes proceeding in p-n junction under the influence of step offsetting voltage and impulse lighting are simulated.
One method to build flying vehicle launch catapults
Authors: Taranukha V. P. , Petrushin S. A. , Pechenkin A. Yu. , Glushkov V. A.
Published: May 2017

The paper considers rotational catapults to launch flying vehicles (FV). Their mathematical descriptions with calculation formulas are given. Rotational catapults are compared with conventional steam and hydraulic devices on the accumulated potential and kinetic energy, power, efficiency, work and the capacity of electrical accumulators. Rotational catapults advantages and disadvantages are analyzed. Ways to fix the existing disadvantages are described. Formulas for calculation of power capabilities of the catapult energy sources are given. Rotational catapults basic performance characteristics are shown, their structural units are depicted. Catapults application in the state-of-the-art systems and devices for unmanned and piloted FV launching are analyzed.
Trouble error parameters determination microrelief optoelectronic means on the basis of correlation algorithm
Authors: Abramov A. D. , Bukanov F. F.
Published: May 2017

In this article the method of compensation of auxillary measurement error by means of optical and electronic complex of the parameters of surface microrelief which appears as a result of the deflection of the light flux level from its nominal meaning is viewed. The method is based on the determination of autocorrelative functions by the image of analyzed surface.
Primary converters for the implementation of Doppler method for measuring blade oscillation power unit
Authors: Danilin A. I. , Gretskov A. A.
Published: May 2017

The paper deals with the design features of building waveguide primary device for implementing the method of dete rmining the parameters of the Doppler blade oscillation power units.
Device for removing phasefrequency characteristics amplifiers
Authors: Tyulevin S. V. , Piganov M. N. , Chopin G. P. , Elizarov S. V.
Published: May 2017

The article discusses a device for removing the phase response of amplifiers. Describes the principles of its operation are given diagrams voltage outputs blocks that make up the device. The processes of change in the phase shift of the output voltage of the amplifier, signal conversion, and coordinates. Formation of orthogonal initial tension and their conversion from rectangular coordinate system in the polar is probed.The advantage of the device is represented by a high precision removal phase response of the amplifier.
Control device nonlinear distortion radioelement
Authors: Shopin G. P. , Tyulevin S. V. , Piganov M. N. , Nasedkin A. V.
Published: May 2017

Considered control device radioelements nonlinear distortion in the transmission path and the amplification of electrical signals. On the causes of non-linear distortion. Given the composition of the control device and communication between its units. Shows the process of converting radio signals. The device provides higher selectivity and precision of control.
Crystal lattice identification on the basis of assessing unit cell parameters
Authors: Kirsh D. V.
Published: May 2017

The paper is devoted to the problem of crystal lattice identification in three- dimensional space. Two identification methods based on assessing the parameters of unit cells have been developed to solve this problem. The first method is based on the calculation and comparison of the six basic cell parameters: the three lengths of the cell sides and the three magnitudes of angles between the sides. The second method is based on the calculation and comparison of Wigner-Seitz cell volumes using the Monte-Carlo method. Both methods include normalized similarity measures for the parameters calculated: the edge similarity and the angle similarity measure for Bravais unit cells and the volume similarity measure for Wigner-Seitz cells. A number of computational experiments for crystal lattice identification were carried out using these methods. In the course of the experiments, first, the dependence of the accuracy of defining the volume of a Wigner-Seitz cell on the number of the points included and, second, the probability of accurate Bravais lattice identification when comparing different sets of the parameters assessed have been specified. As a result of the experiments carried out, the accuracy of identification for four systems of Bravais lattices exceeded 95 per cent.
Simulation of ultrashort pulse transmission in a chain of fused silica microspheres
Authors: Kozlova E. S.
Published: May 2017

The paper is devoted to the simulation of ultrashort pulse propagation in waveguides of two types. The first type (type 1) represents an ordinary waveguide made of cylindrically shaped fused silica without coating. The second type (type 2) consists of microspheres made of the same fused silica following one another. A three-parameter Sellmeyer model is used to take into account the dependence of electrical permittivity on the frequency of radiation. The coefficients of pulse broadening and amplification as well as the coefficient of the pulse spectrum narrowing have been calculated. The numerical simulation using the FDTD method which takes into account the frequency dependence of the permittivity and implemented in the FullWAVE software package showed that there is no temporal broadening in the case of propagation of linearly polarized ultrashort pulse 3.55 fs long with a central wavelength of 532 nm in a waveguide consisting of a sequence of fused silica microspheres with the radius of 1 mkm, while there is a two-fold temporal broadening of the pulse in the case of transmission of this pulse in a conventional silica cylindrical waveguide.
Stochastic method of investigating perturbed motion of a space vehicle in the atmosphere
Authors: Sokolov N. L.
Published: May 2017

When space vehicles (SVs) are moving in the atmosphere detailed accounting of the influence of external perturbation factors is quite difficult: they are either unknown or have a complex nature. This necessitates development of methods to solve the problems of controlling SVs in conditions of uncertainty. A stochastic method of investigating perturbed paths of space vehicles in the atmosphere has been elaborated. The method is based on the mathematical theory of continuous Markovian processes. The principle of reduction from deterministic description of space vehicle motion to the stochastic one is applied. A SV is supposed to be in a limited number of states that are determined by a previously chosen algorithm of phase space discretization. Differential Kolmogorov equations for determining the probabilities of a SV being in each of the states and relationships for the calculation of mathematical expectations of SV space phases are set up. Relationships for calculating the rates of SV transition from one state to another are developed and validated. Ways of reducing the duration of the processes of calculating SV flight paths are proposed. Analytical relationships for determining the values of phase coordinates are formulated. Numerical results of calculating flight paths in a wide range of boundary conditions of SV design characteristics are given. The possibility of applying the proposed method for the analysis of SV motion in the atmosphere in conditions of conditions of flight indeterminacy is shown.
Semantic status of the concepts «innovation», «innovation process», «innovative product» (methodological aspect)
Authors: Sosnina T. N.
Published: May 2017

The paper deals with the semantic roots of such concepts as innovation, innovation process, innovative product; reasons are given for the necessity of looking for criteria of distinguishing innovations from pseudoinnovations. The authors version of defining the above-mentioned concepts from the perspective of the theory of the subject of labour is presented. The innovation concept can be used in cases when consumer-cost and cost process chains are designed with regard for technical and technological, economic, social and ecological components both at the level of tactical aims (obtaining a product with a parameter required by the society) and at the level of strategic aims (obtaining a product the production of which causes minimum damage to the biosphere). The innovation process concept can be used referring to life cycles in which, starting from the product of nature (the object of research), through intermediate stages at which the technological waste is utilized to the product of nature when the final industrial and household products out of use are added to the biogeochemical Earth cycles. The innovative product concept can be used to denote the final products of material production that find practical application in the achievement of the required technical and technological, economic, social and ecological effects and taking measures to utilize the by-products during the life cycle and at the final stage through the connection of the ballast substrate to the biogeochemical Earth cycles.
Development of a low-emission bifuel combustion chamber
Authors: Bubentsov A. V. , Vasiluk D. K. , Golubev P. A. , Kirichenko R. E. , Tashkinov V. A. , Shoshin V. B.
Published: May 2017

The paper presents the experience gained by the “Saturn” science-and-production association in producing a bifuel combustion chamber for the E70/8RD engine. The data on the modernization of the combustion chamber based on the RQQL (rich /quick quench/poor combustion) technology that made it possible to reduce significantly the emissions of NOx while working on natural gas and to meet the requirements of the technical project of the engine are presented. The problem of providing the thermal state of the flame tube walls is also discussed.
Peculiarities of distribution of dynamic disturbances in composite rods
Authors: Karimbayev T. D. , Mamayev Sh.
Published: May 2017

The paper deals with longitudinal elastic-plastic impact on a two-layer composite rod with a fixed opposite end. The composite rod consists of a soft layer (aluminum) and a hard layer (steel), with their position varying. The condition of the continuity of the particle velocity vector and the stress is met on the contact boundary of the rods. To describe the wave processes the grid-characteristic method is used which makes it possible to construct computational algorithms on the borders of the integration area and the interfaces correctly. The interaction of reflected and refracted stress waves at the interface of composite rods is analyzed.. The phenomena on the interface of composite rods are made more complicated by their interaction with the dynamics of changing both the applied external load and the stress waves reflected from the boundary surfaces. As a result of numerical studies we have shown the possibility of damages on the interface for an aluminum-steel composite rod and rapid decay of non-linear effects in the case of steel-aluminum. Positioning rods with specific mechanical characteristics in the order specified by the calculations, we found a possibility to control the level of dynamic loading of each individual element of the composite rod, and hence the operability of the whole composite rod.
The credit banking system of Samara region in the 1920s
Authors: Bannikova N. F. , Samuilovа M. O.
Published: May 2017

The article reviews the changes undergone by the bank crediting system in the USSR in the 1920s as exemplified by the activities of the Samara city municipal bank. The main goals of economic development and, primarily, currency circulation under a new economic policy of the Soviet government are emphasized. Attention is focused on the state of the economic system of the region and changes in the functions of the municipal bank in the areas of industry, agriculture, wholesale trade and transport. The relationships between the Central bank of public utilities and residential housing, on the one hand, and regional banks, on the other, as well as the role of the Samara city municipal bank in developing residential housing and public utilities in the region are shown. Special attention is paid to the solution of the problem of assisting housing construction for workers. The right of municipal banks to issue bonded loans is discussed, changes in the operating of regional banks in the late 1920s are determined. The article covers the processes of reorganization of the financial credit system related to the strengthening of economic management centralization and formation of planned economy. Attention is paid to the peculiarities of the activities of Samara city municipal bank after implementing the administrative-territorial reform. The article includes statistical data on the results of the Samara city municipal banks activities during the period under investigation.
Study of the structure of spherical roller surfaces in grinding
Authors: Nosov N. V. , Mikhailova L. N.
Published: May 2017

The methods of grinding the spherical ends of tapered rollers using the wheel end and periphery are considered. The ways of improving the accuracy of the spherical end when processing using the periphery of a grinding wheel, radially refilled, and ensuring the surface quality due to uneven wear of a wheel are shown. It has been established that increasing the efficiency of grinding the spherical surfaces of a roller is carried out by reducing random and systematic error components of processing. The results of grinding using the corrected radius and the processing device for continuous grinding of spherical roller ends are represented. The structure of surfaces of spherical roller ends using the optical-electronic complex that could reduce the influence of the cur vature of the surface under study on its image is investigated. An algorithm of using binarization of an original halftone image for analyzing the structure of the treated surface, which provides processing and output of the results on the PC screen is considered. The binary images of the surface structure of spherical roller ends with different roughness are shown. The studies of the effect of the average amplitude of oscillation of the autocorrelation function depending on the surface roughness are performed. Thus, the relationship of roughness of the surface profile with the parameters of the autocorrelation function is shown. The optimum parameters of the surface structure, the amplitude of the autocorrelation function and the mathematical expectation that will provide an increase in performance properties of the contact surfaces are determined.
Research of machinability of heat resistant steels 10Х11НN23T3MР-ВД used in parts of gas turbine engines
Authors: Surkov O. S. , Kondratiev A. I. , Alexeev V. P. , Haymovich A. I.
Published: May 2017

In article questions the workability of heat-resistant chromium-nickel steel 10Х11Н23Т3МР-ВД are considered. To investigate the machinability of heat-resistant material used modern milling machines, CNC torque table Kistler, modern monolithic milling tool company Seco, in the form of the mandrel used termic clamping provides the highest rigidity fixing. Posed a series of experiments to measure the cutting forces that arise during processing. For the experiment were selected workpiece in the form of plates. The surface of each sample is pretreated so that the initial surface roughness for all samples was the same Ra 1,25. Materials blanks: Steel ЭП33 ВД (10Х11Н23Т3МР-ВД). As a cutting tool in the model used milling company Seco. The analysis and processing of the experimental results are provided. According to experimental data are constructed dependences of the cutting force on the speed, depth of cut and feed. Depending obtained using neural network models, linking cutting forces with the technological parameters.It is established that the neural network model provides a more accurate prediction of cutting forces, especially in the field of higher cutting speeds. Since the full-scale testing was costly for the purchase of an experienced tool and workpiece, the cutting process was modeled with the given experimental conditions for comparison of experimental data and modeling. For this purpose, it was used a virtual simulation of the machining in the environment DEFORM 3D.
Computer-aided system of virtual gas turbine engine testing
Authors: Tkachenko A. Yu. , Rybakov V. N. , Krupenich I. N. , Ostapuk Ya. A. , Filinov E. P.
Published: May 2017

The article describes the concept of a virtual lab that includes subsystem of gas turbine engine simulation, subsystem of experiment planning, subsystem of measurement errors simulation, subsystem of simulator identification and others. The basis for virtual lab development is the computer-aided system of thermogasdynamic research and analysis ASTRA. The features of gas turbine engine transient modes simulator are described. The principal difference between the simulators of transient and stationary modes of gas turbine engines is that the energy balance of the compressor and turbine becomes not applicable. The computer-aided system of virtual gas turbine engine testing was created using the developed transient modes simulator. This system solves the tasks of operational (throttling, speed, climatic, altitude) characteristics calculation, analysis of transient dynamics and selection of optimal control laws. Besides, the system of virtual gas turbine engine testing is a clear demonstration of gas turbine engine working process and the regularities of engine elements collaboration. The interface of the system of virtual gas turbine engine testing is described in the article and some screenshots of the interface elements are provided. The developed system of virtual gas turbine engine testing provides means for reducing the laboriousness of gas turbine engines testing. Besides, the implementation of this system in the learning process allows the diversification of lab works and therefore improve the quality of training.
Criterion of optimization of slow fatigue crack growth in metals and alloys
Authors: Kol’tsoun Yu. I. , Molyavko D. P. , Ignatovskiy A. D. , Khibnik T. A.
Published: May 2017

Based on macro structural analysis of a typical fatigue fracture of a cylindrical specimen of alloy D16T with an annular notch in bending is shown the technique of constructing the kinetic diagram of slow growth of fatigue cracks in the light of the third coordinate - the number of cycles. It is shown the quantification of growth up cracks in the projection plane: of quantity of cycles - the speed of the crack. A kinematic diagram of slow growth of a fatigue crack gives the possibility to assess the beginning of intensive increase to a stable crack growth of 10-6 10-4 mm/cycle. It is technically difficult to monitor fatigue crack growth at this level of growth rate. This is why the beginning stage of the transition from a slow-growing fatigue crack to a stably growing crack is an important technological safety parameter in the operation of parts with cracks. This work proposes a new criterion of assessing the optimality of slow fatigue crack growth on the example of the aluminum alloy D16T.
Dynamic of the a safety vent valve
Authors: Makaryjants M. V. , Kudyurov L. V. , Mustafaev Yu. K. , Tumanov D. V.
Published: May 2017

The mathematical model that simulates the running of drainage safety valve is concerned. The valve controls pressure through the sensor. The movement is discussed taking into account the following aspects: alterations of pneumatic capacities specified in device design, alterations of the pressure in pneumatic volumes at the permanent temperature, there is gas overflow occurring in special channels between specified volumes, there is the friction between the valve plate and its sliding rail, there are periodical external dithers of a variable frequency. The results of computational modeling and cause analysis of maintained pressure depreciation by the specified frequencies are provided.
Technological processes of producing materials by specified criteria of forming the properties of aircraft assembly units
Authors: Tlustenko S. F.
Published: May 2017

Results of formation of structure of an assortment from the technical cleanliness titan depending on coarse-grained or nanostructural state for maintenance of mechanical properties received by various ways of details of assemblages are presented. The structure of the titan depending on conditions and character saturation by hydrogen is studied at machining. It is established that modes on character of technological deformation of preparations render proskating rinks of strips and sheets hereditary influence on fluctuations of mechanical properties of metal on its area and a thickness. It is shown the results of studies link changes in crystallographic texture samples of titanium with the nature of the formation of the microstructure of the alloy in the technological processes of hot plastic deformation on the example of cylindrical samples of two-phase titanium alloy VT9 under various schemes application of stress and strain in machining, tension, torsion, ching.