Abramov A.D.,Siberian State Transport University |
Galay M.S.,Siberian State Transport University
IOP Conference Series: Earth and Environmental Science | Year: 2017
Effect of vibropercussion plastic strengthening on microhardness and depth of strengthening of tread areas of railway welds is experimentally studied. It is found that improvement of hardness of railway welds requires impact treatment of welds with a unit blow energy of 20 J by an indenter with a cylindrical flat end 55 mm in radius. Under the specified energy impact, a surface layer is formed with the microhardness of 5800-6100 MPa and the strengthened thickness of 1.8-2 mm. The implementation of the technology for vibropercussion plastic strengthening of railway welds needs a moble unit with an electromagnetic drive to be designed. © Published under licence by IOP Publishing Ltd.
Ilinykh A.S.,Siberian State Transport University
IOP Conference Series: Earth and Environmental Science | Year: 2017
The experimental studies aimed to design heavy-duty abrasive wheels for high-rate grinding are presented. The design of abrasive wheels with the working speed up to 100 m/s is based on the selection of optimized material composition and manufacture technology of the wheels. © Published under licence by IOP Publishing Ltd.
Lim C.S.,Hanseo University |
Aleksandrovsky A.S.,Siberian Federal University |
Molokeev M.S.,Siberian State Transport University |
Oreshonkov A.S.,Siberian Federal University |
Atuchin V.V.,South Ural State University
Journal of Alloys and Compounds | Year: 2017
Ternary scheelite-type molybdate NaSrLa(1-x-y)(MoO4)3:xEr3+,yYb3+ (x = y = 0, x = 0.1 and y = 0.2, x = 0.05 and y = 0.45, x = 0.2 and y = 0) phosphors were successfully synthesized by the microwave sol-gel method for the first time. Well-crystallized particles formed after the heat-treatment at 900 °C for 16 h showed a fine and homogeneous morphology with a particle size of 2–3 μm. The crystal structures were refined by the Rietveld method in space group I41/a. The optical properties were examined comparatively using photoluminescence emission and Raman spectroscopy. Under the excitation at 980 nm, the NaSrLa0.7(MoO4)3:0.1Er3+,0.2Yb3+ and NaSrLa0.5(MoO4)3:0.05Er3+,0.45Yb3+ particles exhibited a strong 525-nm emission band, a weaker 550-nm emission band in the green region and weak 655-nm, 490-nm and 410-nm emission bands in the red, blue and violet regions. The pump power dependence and Commission Internationale de L'Eclairage chromaticity of the upconversion emission intensity were evaluated in detail. The presence of Sr in NaSrLa(MoO4)3, in comparison with NaCaLa(MoO4)3 compound, leads to frequency shift mainly in the low region of Raman spectra. The MoO4 bending vibrations are most susceptible to changes in the distance between the nearest oxygen atoms in the nearest neighboring MoO4 groups. © 2017 Elsevier B.V.
Medvedeva T.A.,Siberian State Transport University |
Umpleby S.A.,George Washington University
Cybernetics and Systems | Year: 2015
The management of social and labor systems requires a multidisciplinary perspective. Academic disciplines focus on different aspects of the social change process and use different methods for describing systems. Systems can be described primarily in terms of variables, ideas, groups, or events. All of these methods can be used to create a richer description of the system of interest. This article describes a theory of social change that uses all of these disciplinary methods. Two illustrative cases are presented: adopting quality improvement methods in management in the United States after 1980 and changing social and labor relations in Russia after 1990. © 2015 Taylor & Francis Group, LLC.
Efimov V.P.,Russian Academy of Sciences |
Nikiforovsky V.S.,Siberian State Transport University
Journal of Mining Science | Year: 2010
The paper proposes an assessment method for safe stress in the kinetic concept of strength based on the warm-up drift technique in the model of a steady state with a broken bond. The authors added molecular interaction potential with a second potential energy minimum that corresponds to an excited molecule with broken bonds with its neighbors. The quasi-homogenous fracture model with using macro-values of a continuum has yielded that safe stress for metals and salts equals 10-20 % of their temporal tensile strength. © 2010 Pleiades Publishing, Ltd.
Bobrov A.L.,Siberian State Transport University
Russian Journal of Nondestructive Testing | Year: 2010
Peculiarities of the estimation of the state of sections with casting flaws in cast parts using acoustic-emission (AE) method are considered. The dynamics of variations in AE parameters for developing flaws during mechanical tests is analyzed. The methods for distinguishing useful information of AE signals from the regions of localization of casting flaws are revealed. © Allerton Press, Inc., 2010.
Isakov A.,Siberian State Transport University |
Moryachkov Y.,Siberian State Transport University
International Journal of Geomechanics | Year: 2014
Modern methods for calculating slope stability in current finite-element programs involve the stepwise uniform reduction of the soil strength parameters. However, prediction of the strength-reduction law under the influence of external factors is not actually possible. The suggested method for safety-factor minimization will produce the most reliable estimation of slope stability. This idea is illustrated by calculating the safety factor for embankments composed of clay loam and sand. © 2014 American Society of Civil Engineers.
Karaulov A.M.,Siberian State Transport University |
Korolev K.V.,Siberian State Transport University
Soil Mechanics and Foundation Engineering | Year: 2015
A solution of Culmann's scheme is proposed for determining active and passive earth pressures on retaining walls. It is shown that the active and passive earth pressure coefficients obtained in the solution are different from those given in SP 22.13302011. It is proposed that the results of the solution be used in practical calculations of the active and passive earth pressure on retaining walls. © 2015, Springer Science+Business Media New York.
Popkov A.,Siberian State Transport University
Journal of Physics: Conference Series | Year: 2016
The article contains information about acoustic emission signals analysing using autocorrelation function. Operation factors were analysed, such as shape of signal, the origins time and carrier frequency. The purpose of work is estimating the validity of correlations methods analysing signals. Acoustic emission signal consist of different types of waves, which propagate on different trajectories in object of control. Acoustic emission signal is amplitude-, phase- and frequency-modeling signal. It was described by carrier frequency at a given point of time. Period of signal make up 12.5 microseconds and carrier frequency make up 80 kHz for analysing signal. Usage autocorrelation function like indicator the origin time of acoustic emission signal raises validity localization of emitters. © Published under licence by IOP Publishing Ltd.
Maslov N.A.,Siberian State Transport University
Russian Engineering Research | Year: 2014
The possibility of pump diagnostics on the basis of its duration of deceleration is considered. A test bench with an inertial drive is developed for positive-displacement pumps, along with corresponding methods of analysis. © 2014, Allerton Press, Inc.