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  • Physical and mathematical sciences. Physics

  • Definition of possible energy potential parameters flue gas boiler service enterprises in the use of secondary energy resources

    This paper proposes a method of determining harmfulness of pollutants resulting from the operation of boiler equipment, discusses how the use of heat energy waste resulting from the operation of thermal plants boilers, as heating of the coolant. And is determined by the energy potential of waste heat, calculate the concentration of pollutants in the atmosphere and provide a method of determining the calculated fuel consumption volume of flue gases, amount of contaminants emitted into the atmosphere during operation of boiler enterprises.

    Keywords: resources, energy, coolant, contaminants, heat capacity, energy saving

  • Designing of protective structures from industrial vibration considering the acoustic properties of textile materials

    This article gives an idea of the negative effects of vibration in the aircraft industry in the human body and its internal organs. In the article a lot of attention paid to the analysis of working conditions of pilots and technical workers. The requirements that apply to future product. It reflects the results of testing the properties of vibration protection materials that were used to manufacture the designed product. Reasonable requirements to design personal protective equipment. Submitted sample protection, which was carried out in accordance with all the requirements that were presented to him.

    Keywords: Personal protection, protection against vibration, protective vest, evaluation criteria, unfavorable factors of production

  • Possible pathway to discovery of superconductivity above 200K

    Based on crystal chemistry analysis and electron-density calculations, author is suggesting the concept of influence of protons on superconductivity and indicating the ideas for determination of superconducting materials with Tc≥200K. The directions for further research in the field of superconducting materials development are represented. According to submitted conception, the best results with respect of estimated Tc enhancement could be obtained for a sample with an optimal (smooth) interlayer electrostatic potential and high concentration of mobile protons. A superconducting impurity in some known layered phases would be a plausible explanation for anomalies in physical properties nearly 200K and above this limit.

    Keywords: Layered phases; high temperature superconductivity; crystal chemistry prognosis

  • Composite ceramic materials based on La0,67Sr0,33MnO3 with positive and negative magnetoresistive

    Lanthanum strontium manganite La0,67Sr0,33MnO3 which has a high spin polarization of the carriers has been used to create composite materials with different barrier materials - GeO2, Li4P2O7, C. The magnetoresistive properties of the synthesized ceramics at room temperature have been investigated. It has been found that the magnetoresistive isotropic negative values ​​for samples with germanium oxide at room temperature in a magnetic field of 18 kOe reach a value of 15%, with the barriers of lithium pyrophosphate - 16%. It has been determined that the samples which contain 10-85% graphite at a field of 15 kOe exhibit positive magnetoresistance reaching a value of 15% .

    Keywords: lanthanum strontium manganite, composite material, ceramics, magnetoresistance, X-ray diffraction, microstructure, barrier layer, tunneling, percolation transition, spin polarization, the Seebeck effect

  • The phase composition and physical properties of high-temperature multiferroic BiFeO3 / Nd

    The investigations of the crystal structure, grain structure and dielectric properties of high-temperature multiferroic Bi1-хNdxFeO3 were carried out over a wide concentration range x = 0.00-0.50.

    Keywords: multiferroic crystal structure, grain structure, dielectric properties

  • Studies of low-temperature multiferroic samarium doped bismuth ferrite

    The investigations of the crystal structure, grain structure and dielectric properties of high-temperature multiferroic Bi1-хSmxFeO3 were carried out over a wide concentration range x = 0.00-0.50.

    Keywords: multiferroic crystal structure, grain structure, dielectric properties

  • Estimation of radiotelescopes' parameters for observation of extended galactic gas disks

    A possibility to observe synchronous emission of distant galaxies' ionized hydrogen by extended disks is discussed in this work. It is shown that the most preferred wavelength range from the viewpoint of observation success rate is decameter range on low frequency limit allowing for such observations: 3 MHz. It is shown that high brightness temperature of noise in this frequency range forces to consider only a possibility of interferometer observations. This mode allows to detect a signal from extended ionized galactic disks located within the Local Group. The work also provides an assessment of the capacity to measure the parameters of these disks by means of raying them with radiation from pulsars and measuring dispersion of signal.

    Keywords: HII and HI regiones, synchrotron radiation, radio emission galaxies, brightness and noise temperature, radiointerferometry, decameters interferometer

  • Construction criteria for the identification of damage on the basis of the phase portraits fluctuations trusses

    This paper proposes a method for detecting damage truss rod cantilever structure on the basis of new information sign "Express - distinguishing between" damage. It is based on the analysis of the phase diagrams for modeling its transient oscillations. Produced comparison of various parameters damped oscillations truss rod design for the structure without damage and corruption. Processed and analyzed the frequency response based on them phase diagrams. To analyze the response considered in the frequency range from 0 to 100 Hz. An analysis of the phase diagrams in different frequency regions design is presented as an information sign "Express - distinction" of having damage to the truss.

    Keywords: Truss rod design, damage, finite element modeling, information sign, transient fluctuations of the amplitude-frequency analysis, phase diagrams

  • Investigation of a two-dimensional piezoelectric beam model parameters

    The paper deals with an influence of a piezoelectric beam geometric dimensions on the primary parameters of piezoelectic constructions. Such parameters as resonance and antiresonance frequencies as well as electromechanical coupling coefficient are investigated. Optimal piezoelectric beam length and width relations are obtained. In conclusion some thoughts on piezoelectric beams practical applications in hydroacoustics are discussed.

    Keywords: hydroacoustic antenna, ANSYS, piezoelectric transducer, beam, amplitude frequency characteristic, electromechanical coupling coefficient, modeling, normal mode

  • Investigation of dependence unit cell parameter from the platinum Pt/C catalysts size: the method of X-ray absorption spectroscopy

    Platinum based nanocomposite materials are widely used as catalysts for proton-exchange membrane fuel cells (PEMFC).Carbon supported pure Pt electrocatalysts were prepared by several methods including wet synthesis and electrochemical technique. The X-ray absorption measurements of pure Pt catalysts in the Pt L3 absorption edge were carried out at the Rigaku R-XAS using fluorescence mode. A change of white line intensity of XANES with changes of Pt/C particle size was found. The change of oxidation state of Pt/C nanoparticles, which may be the result of the interaction of nanoparticles with a carbon substrate, is shown. Also theoretical XANES spectra with decreasing interatomic distance Pt-Pt were calculated using FEFF8 code. It is well known that the decreasing of the Pt-Pt distance is one of the reasons of the positive influence of the catalytic activity toward the oxygen reduction reaction (ORR).

    Keywords: XANES, nanoparticles, nanocatalysts, nanocomposites, composite materials

  • Theoretical study of the local atomic and electronic structure of dimetacyano azobenzene molecules on Bi (111) substrate

    The present work is devoted to the local atomic and electronic structure of dimetacyano (DMC) molecules deposited on a Bi (111) substrate before and after irradiation by X-rays and UV light using density functional theory (DFT) and a theoretical analysis of the X-ray absorption near edge structure (XANES) spectroscopy. As a result of the calculations the low-energy structure for DMC azobenzene molecules on a Bi (111) substrate was obtained.

    Keywords: local atomic and electronic structure, X-ray absorption spectroscopy, photoisomerization, density functional theory

  • The method of reducing the thermal resistance of immersion cooling system of supercomputer

    Low heat transfer coefficient per unit area is main disadvantage of immersion cooling system. In the theoretical part of the study the main issue was to evaluate the influence of various factors on the convective heat transfer between the solid-liquid interface. The result of this part of study was conclusion that the type of fluid flow in the area of heat transfer is key factor of increase heat convective heat transfer of thermal contact. The Reynolds number is main characteristic of turbulence of fluid flow. Therefore in the experimental part describes study of the effect of the degree of turbulence of the fluid flow at the place of the thermal contact on thermal resistance of immersion cooling system. The design of experimental setup and its main parts is describe further. The result of the experiment is graphic of experimental curve of the thermal resistance of immersion cooling system from the Reynolds number of fluid flow of thermal contact between the solid-liquid interface. The study showed the possibility of local reduction of the thermal resistance of immersion cooling systems to maintain the quality of the thermal management of computing elements that emit significant heat. The results of the study is define the ranges of values of the Reynolds number of cooling system that allows the technical realization at the current dimensions of packages and sizes of microchips sockets.

    Keywords: microchip, heat flow, cooling system, Laplace's equation, turbulent flow, Reynolds number, heat transfer, thermal resistance, electrothermal analogy, thermal protection

  • The research phase and impurity composition of the cathode strips alloys Pd-Ba

    For the first time, using modern analytical methods studied phase and impurity composition of the cathode alloys Pd-Ba, obtained by industrial technology. The concentration of harmful impurities (C, Zn, Ba, Cu) in objects of study does not exceed the standards for these materials. Transmission electron microscopy and X-ray analysis confirmed the previously observed biphasic alloys Pd-Ba, from which one phase - intermetallic compound (Pd5Ba), second - palladium (matrix), wherein the intermetallic compound is very unevenly distributed in the matrix. The object of the study was first detected undesirable phase Pd2O. It is found that in the alloys of Pd-Ba grain Pd - large (about one micron), grain phase Pd5Ba - from a few hundred nanometers to one micron. All beans there is a high density of randomly distributed dislocations. Processing methods are proposed to improve the homogeneity of the alloy.

    Keywords: alloyed metal cathodes, Pd-Ba, emission properties, transmission electron microscopy, X-ray analysis, impurity composition, the coefficient of secondary electron emission

  • The research phase and impurity composition of the cathode strips alloys Pt-Ba

    For the first time, using modern analytical methods studied phase and impurity composition of the cathode alloys Pt-Ba, obtained by industrial technology. The concentration of harmful impurities (C, Zn, Ba, Cu) in objects of study does not exceed the standards for these materials. Transmission electron microscopy and X-ray analysis confirmed the previously observed biphasic alloys Pt-Ba, from which one phase - intermetallic compound (Pt5Ba), second - platinum (matrix), wherein the intermetallic compound is very unevenly distributed in the matrix. It is found that in the alloys of Pt-Ba Pt grains - small (a few hundred nm) and grain Pt5Ba - large (make several microns) and more sophisticated. Inside there are grains Pt5Ba voltage. Processing methods are proposed to improve the homogeneity of the alloy.

    Keywords: alloyed metal cathodes, Pt-Ba, emission properties, transmission electron microscopy, X-ray analysis, impurity composition, the coefficient of secondary electron emission

  • Programmatically-hardware complex for the research purposes in area of Piezoelectric Device-making

    In article the hardware-software complex created on the basis of widespread software products is considered. The environment of programming of LabVIEW is used. Results of the pilot studies conducted by means of the developed complex are presented.

    Keywords: hardware-software complex, LabVIEW, piezoceramic element, the frequency response of conductivity

  • The felling-skidding machines functionality modernization and expansion based on intellectual property

    The paper presents description and analysis of the upgraded felling-skidding machine (FSM). It offers a range of technical solutions for efficiency improvement and FSM using expansion, including fuel chips production and log spurs construction with the wood waste. The creation of FSM with advanced features provides the partial import substitution of machines for CTL logging.

    Keywords: felling-skidding machine, modernization, efficiency improvement, logging operations, fuel chips, log spurs

  • Technical science. Informatics, computer facilities and management

  • Path planning for autonomous mini-ship

    The paper deals with the trajectory planning of the mini-ship in an environment with obstacles. The structure of the control system hardware, software architecture built on basis of ROS software environment are presented. Global planner is designed using Voronoi diagrams method. Local planner (regulator) proposed to be implemented using the unstable regimes of control to bypass obstacles near the mini-ship. The results of simulation showed the efficiency of the proposed approaches.

    Keywords: mini-ship, management, planning, Voronoi diagram, ROS

  • Theoretical bases of construction of regional monitoring systems

    Abstract: The article describes the theoretical and practical bases of formation of a regional system of monitoring technospheric security. Author's concept of a systematic approach to the solution of important scientific and technical problems. In particular, based on the literature review and the results of their own research found that for the purposes of implementing and monitoring the status of long-term forecasting of health and safety it is logical to apply the structure of the monitoring function of the feedback and the integrated forecasting, constructed using the principle of synergy of the elements.

    Keywords: territorial monitoring system, a comprehensive analysis of the system, the synthesis of elements, synergy, prediction, dynamics

  • Automated control of the formation of the professional skills of the operator robotic system using fuzzy logic

    The article considers the models of automated control of the formation of sensorimotor skills of the student (ie, the future operator of the process) by performing exercises with the use of computer training complex. The control circuit corresponding to the model described in detail dismantled. The process of obtaining the integral index of quality of exercise on a computer simulator considered. Developed management model is the basis for the implementation of the relevant software simulators that can be used for operator training processes performed using robotic systems as well as for training of operators of complex industrial and other processes.

    Keywords: robotic system, the production process, computer training complex, sensory-motor skills, control system, fuzzy modeling

  • Differential properties of the S-boxes of GOST 28147-89 algorithm

    The paper presents the basic differential characteristics identified for the S-boxes of GOST 28147-89 algorithm, included in the data encryption standard GOST 34.12-2015, which comes into force from January 1, 2016. The detected properties can be used for analysis with such methods as differential cryptanalysis and impossible differential cryptanalysis.

    Keywords: encryption algorithm, symmetric encryption, block cipher, S-boxes, differential cryptanalysis, impossible differential cryptanalysis, differential properties

  • Human resources in the region: the preconditions and obstructions of economic development?

    Analyzes the impact of "recipes" for the proposed development of the economy of Russia and Karelia, including a variety of conceptual, organizational and economic structure: the search for "growth points" and the formation of clusters of various branch orientation, the creation of free and special economic zones and territories of priority development. The necessity of the development of innovative activities.

    Keywords: Republic of Karelia, workforce, economic development

  • Simulation of the design activity diversification of innovative enterprise

    The main maintenance of a diversification of production as activity of subjects of managing is considered. being shown in purchase of the operating enterprises, the organizations of the new enterprises, redistribution of investments in interests of the organization and development of new production on available floor spaces. The most important organizational economic targets of a diversification of management are presented by innovative activity of the industrial enterprise.

    Keywords: diversification of management, production diversification, financial and economic purposes of a diversification, technological purposes of ensuring flexibility of production

  • Simulation of a five-channel inverter with scalar control the motor speed by means of MATLAB / Simulink

    The article describes the results of simulation of a five-channel inverter with scalar control the motor speed. Briefly describes the principles of a scalar control, the structure of the five-channel inverter, as well as five-channel method of controlling the inverter using the method of double-zero sequence voltage (DZV). The structure of the model and the simulation results, confirming the possibility of using a five-channel inverter with scalar control the motor speed is considered.

    Keywords: motor, speed control, scalar control, five-channel inverter, Simulink