×

You are using an outdated browser Internet Explorer. It does not support some functions of the site.

Recommend that you install one of the following browsers: Firefox, Opera or Chrome.

Contacts:

+7 961 270-60-01
ivdon3@bk.ru

  • The design's technique of combined drills with replaceable multiface plates

    The technique of the geometrical analysis and the analysis of force loading of combined drills with the replaceable multiface plates is offered in this work. This technique is allowing to determine geometrical parameters and specific force loadings in each point of a plate’s cutting edge taking into account its orientation in the drill case. Application of this technique allowed to establish the reasons of the drill’s low durability. The offered technique allows to design drills from the minimum unbalanced radial component of cutting force which increases its working capacity and the processed holes quality. New designs of combined drills both with two, and with three replaceable multiface plates are offered in this work. The durability of this new drills is increased by the plates mutual turn for the minimization of an unbalanced radial component of cutting force  

    Keywords: combined drill, replaceable multiface plate, drilling, design, equilibration, geometrical analysis, the analysis of power loading

  • Application of system of Radio Frequency IDentification (RFID) for automation of work of road transport in port.

    RFID technologies, one of innovative management methods by cargo  road transport is considered in the article. Definition, structure and advantages RFID of system are made. Scopes of system of Radio Frequency IDentification are considered for automation of motor transport.

    Keywords: Freight transport, Radio Frequency IDentification (RFID), RFID-Label, Interaction of road transport and ports.

  • Gasdynamic approach to an assessment of losses on a thermolysis in the simple gas pipeline

    In article gasdynamic approach for the solution of a task on heat distribution in simple gas pipelines on the basis of consideration of a current of gas in a laminar mode is considered. The objective is solved by means of research of system of the equations of work of extending gas taking into account an assessment of difference of temperatures at explosive decomposition of a working product. Classical approaches to research of distribution of heat in a simple cylindrical pipe are thus taken as a basis the main dependences characterizing both full, and the current work of a working product by means of correction coefficients and a ratio of temperatures of heating of walls Are presented. Connection between pressure is established at different weight ratios of gas. The specified approach can be used as a technique of model research of gasdynamic processes taking into account a thermolysis in gas pipelines.  

    Keywords: thermolysis, gas pipeline, gas work, temperature, pressure

  • Hybrid reverberation algorithm

    A hybrid reverberation algorithm is offered in this article. This algorithm is using both a convolution section in which a convolution with an inmpulse response of a real acoustic room is being implied and a mathematical reverb model. Also an algorithm for generating impulse responses of optional rooms is also offered in the following article. The algorithm efficiency calculation is  specified in the article. Thia reverberation algorithm is a part of a bigger complez auralization algorithm where it is being used coherently with an HRTF-based algorithm in order to simulate a real acoustic environment  

    Keywords: artificial reverb, room simulation, convolution algorithm, impulse response convolution, impulse response synthesis, dynamic convolution, complex filtering

  • Calculation of the strength of reinforced beams with an aggregate of bimodulus of elasticity material with the use of different theories of strength

    The paper considers arbitrarily supported arbitrarily loaded reinforced, beam with an aggregate of bimodulus of elasticity material. Formulas for determination of the tangential stresses arising in the aggregate, subject to the reinforced elements. Formulas are obtained for principal stresses occurring at an arbitrary point in the aggregate, as well as the equation for determining the point where major stresses reach extreme values. Are terms of strength as the classical theories of strength, and strength criteria applied for calculation of constructions made of bimodulus of elasticity material.

    Keywords: reinforced beam, bielastic modulus, stress, normal concrete, strength criteria.

  • Automatic device for analysis the nonlinear parameters of HTSC ceramics YBa2Cu3O7-x in variable magnetic fields.

    Considered part of the software and hardware designed and manufactured the device for the automatic analysis of nonlinear parameters of high-temperature superconducting ceramics YBa2Cu3O7-x in variable magnetic fields. Shows the calibration and specifications. The new is a synchronous (the error in determining the phase of no more than 0.5%) of digital signal samples of the nonlinear response of the sample and the samples generated by an external magnetic field (the error is less than 1%), with the number of data samples per channel to 90 ∙ 106 12-bit samples and sampling 600 ∙ 103 samples per second. The reference range of variable magnetic fields 1 - 50 Oe, a frequency range of 1 - 50 kHz in steps of 1 Hz and the accuracy of 0.0291 Hz. The device has an interface to the computer via two USB-interface and original software to work with it. With the use of the device, a series of experiments designed to produce some non-linear parameters of cylindrical sample made of high-Tc ceramic YBa2Cu3O7-x. The analysis of the results and their comparison with the presented in the literature  

    Keywords: Nonlinear medium, high-temperature superconducting ceramics, synchronous samples, harmonics, ARM-9 CPU, a differential sensor.

  • The experience of building piled foundations of the piles on nonuniform basis during the construction of a 17-storey residential building in Rostov-on-don

    The article describes the experience of the device of pile foundations under the multi-storey building in difficult engineering-geological conditions in Rostov-on-don

    Keywords: Drilling piles, test, conductor pipe, sandconcrete, foundation

  • Methods for the synthesis of LaMnO3 (Review)

    "This review covers various methods of synthesis LaMnO3 ferroics. The general analysis of the solid-phase synthesis reactions methods and wet methods (sol-gel, sorption, co-precipitation) are carred out. The original results of LaMnO3 syntheses from various precursors by means of the in situ method are showned. The advantages and disadvantages of different methods of synthesis are determined. The analysis of synthesis LaMnO3 ferroics published data is shown:
    - the structure formation of LaMnO3 in perovskite-type phases occurs at different temperatures, depending on precursors states;
    - LaMnO3 perovskite phases differ in symmetry and unit cells parameters at room temperature, depending on the preparation conditions;
    - the highest synthesis temperature of LaMnO3 are typical for solid phase reactions method (950-1050 ° C), the lowest - for wet synthesis methods (500-700 ° C);
     - the synthesis conditions effect the stoichiometry of LaMnO3 for oxygen content.
    Our studies of structure formation processes of LaMnO3 by in situ method are allowed to define the role of precursors states at synthesis of solid phase reactions methods, adsorption, co-precipitation and sol-gel mixtures.
    It is determined that in samples prepared by wet chemical methods, the formation processes of  LaMnO3 perovskite phases occur at lower temperatures than by solid phase reaction (sol-gel precursor - 500 <T <600 ° C; precursors obtained by coprecipitation and sorption methods - at 600 <T <700 ° C and 700 <T <800 ° C, respectively).  

    Keywords: ferroics, LaMnO3, X-ray diffraction, solid-phase synthesis, sol-gel synthesis, sorption, co-precipitation

  • Thermostability of oxide alkali tungsten and molybdenum bronzes

    Oxide bronzes MxEO3 (M–Na,K; E – W,Mo) are the inorganic materials for technics and chemical technology. Its properties, for example stability in wide interval of temperatures, are of great practical interest (electrodes for fuel elements, electronic apparatuses  and others).                                                                             In this article the results of studies of thermostability of sodium and potassium tungsten and molybdenum bronzes in atmosphere and vacuum condition at the temperatures range 20-1110°C were found. The samples are prepared by electrolysis of melts of sodium and potassium isopolytungstates and molybdates. Dates for bronzes Na0.92WO3 , Na0.68WO3 , Na0.53WO3 , Na0.15MoO3, K0.3MoO3 were characterized by the termogravimetric-differential- thermal analysis (TG-DTA). Regions of stability of Na0.92WO3 : 20-700°C , of MxMoO3 : 300-500°C were founded. Conclusion about correlation of  nonstoichiometry of chemical composition of EOx bronzes and oxides, which making important role in formation of less - common metal bronzes structure.

    Keywords: oxide alkali bronzes, tungsten, molybdenum, thermostability, nonstoichiometry, thermal analysis

  • Laser interferential thermometric measurement of high frequency (HF) and super-high frequency (SHF) energy density

    There submitted a HF and SHF field energy density measuring technique developed by authors in this work with application of semiconducting laser interferometer measuring an alteration of a glass plate optical thickness while the plate is placed in the sphere of HF or SHF heating. Operability of the technique is demonstrated by measurement of a microwave oven electromagnetic field energy density distribution

    Keywords: laser interferometer, temperature measurement, HF and SHF field sensor

  • The calculation of the optimal value of the protective layer of concrete columns of square section

    An approach to the calculation of the optimal values ​​of the protective layer of longitudinally reinforced concrete columns, operating at a central compression. Modeling performed using FEM - Ansys package for the design and implementation of spatial models of flat section of the column.

    Keywords: reinforced concrete column, longitudinal reinforcement, a protective layer of concrete, finite element method, critical load

  • The extent of the stress-strain diagram of eccentrically compressed concrete pillars

    On the basis of experimental data on the resistance of reinforced concrete columns eccentric compression was obtained analytical dependence of the limiting compressibility of concrete from the varied factors: the relative eccentricity of the external force eo / h and the reinforcement ratio μ.

    Keywords: reinforced concrete column, longitudinal reinforcement, a protective layer of concrete, finite element method, critical load

  • The choice of boundary conditions for the simulation of the temperature field of soil

    The existing methods of calculation of the annual change in soil temperature. Identified areas of their application and the possible deviations from reality. The requirements to the boundary conditions of the calculation. Defines the principles of the choice of initial conditions. The preconditions for the development of a universal method of calculation.

    Keywords: heat pump, renewable energy, solar radiation, transient mode, soil

  • Method of calculation of power characteristics of belt elastic element

    Currently actively developing direction of seismic protection, the identified using absorbing screens made in the form of sandwich structures with упругопластическими energy-absorbing elements. In this article, on the basis of the conducted research and analysis, the formulas for the calculation of power characteristics of belt elastic element.

    Keywords: Dynamic loading, uprugoplastichesky deformation, deformation chart, power absorption

  • Personnel streams in logistics of transport

    Problems of formation of the logistical approach to management of personnel streams of the enterprise are considered.

    Keywords: Logistic, person, stream, transport, logistics sistem