Khazar, Russia

Omsk State Transport University is a university in Omsk, Russia. It was established in 1961. Wikipedia.

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Agency: Cordis | Branch: FP7 | Program: CSA-SA | Phase: SST-2007-6.0-01;SST-2007-6.0-02 | Award Amount: 506.34K | Year: 2008

Contributing to the European Research Area in surface transport to strengthen the competitiveness of the European surface transport sector. This will be achieved by using the excellent EURNEX competence to provide research excellence capabilities to European Small and Medium Size Enterprises (SMEs). Furthermore the cooperation with research excellencies from non EU countries will stimulate research that is of mutual interest and strengthen the European as well as non European research excellencies. EURNEX, the European Rail Research Network of Excellence, started on 01 January 2004 and has been granted for 4 years with 6 Mio within the 6th Framework Programme of EC. It involves 66 research institutes from 20 European countries and the associations of industry and operators UNIFE, UIC and UITP. More than 80 % of the members cover not only the rail research domain but surface transport. EURNEX supports the aims of the EC to see an interoperable and harmonised European rail system contributing to co-modality and a strong internationally competitive European railway industry by integrating the fragmented research, sharing knowledge and coordinating current research. The main benefits for the integration of non EU researchers in EURNEX are the scientific exchange on an international level, the training of junior scientists and researchers using the EURNEX assets, the identification of research areas that are of mutual interest, and the solving of problems in the international railway sector with European know how. The main benefits, that SMEs contributing as associated partners in EURNEX can gain, are an overview of the state of the art of the surface transport sector as a whole as well as specific topics, an insight in current research trends, an evaluation of their individual know how (respecting sensitive information), and an access to excellent research capabilities and test facilities.

Chushnyakova M.V.,Omsk State Technical University | Bhattacharya R.,University of Calcutta | Gontchar I.I.,Omsk State Transport University
Physical Review C - Nuclear Physics | Year: 2014

Background: In our previous paper [Gontchar, Phys. Rev. C 89, 034601 (2014)PRVCAN0556-281310.1103/PhysRevC.89.034601] we have calculated the capture (fusion) excitation functions for several reactions with O16,Si28, and S32 nuclei as the projectiles and Zr92,Sm144, and Pb208 nuclei as the targets. These calculations were performed by using our fluctuation-dissipation trajectory model based on the double-folding approach with the density-dependent M3Y NN forces that include the finite range exchange part. For the nuclear matter density the Hartree-Fock approach with the SKP coefficient set that includes the tensor interaction was applied. It was found that for most of the reactions induced by O16 the calculated cross sections cannot be brought into agreement with the data. This suggested that the deviation in the calculated nuclear density for O16 from the experimental one was crucial. Method: The SKX parameter set is used to obtain the nuclear densities. Reactions with C12 and S36 as the projectiles and Pb204 as the target are included in the analysis in addition to those of the previous paper. Only data that correspond to the collision energy Ec.m.>1.1UB0 (UB0 is the s-wave fusion barrier height) are included in the analysis. The radial friction strength KR is used as the individual adjustable parameter for each reaction. Results: For all 13 reactions (91 points) it is possible to reach an agreement with the experimental fusion cross sections within 10%. Only at ten points does the deviation exceed 5%. The value of KR, which provides the best agreement with the data in general, decreases as the system gets heavier in accord with the previous paper [Gontchar, Phys. Rev. C 89, 034601 (2014)PRVCAN0556-281310.1103/PhysRevC.89.034601]. A universal analytical approximation for the dependence of KR upon the Coulomb barrier height is found. Conclusions: The developed model is able to reproduce the above-barrier portion of the fusion excitation function within 5% with a probability of 90%. Only one fitting parameter per excitation function KR is used. The model can be used to predict the results of relevant measurements. The universal analytical approximation of the KR dependence upon the Coulomb barrier height helps to find the starting value of KR for a more accurate description. © 2014 American Physical Society.

Gontchar I.I.,Omsk State Transport University | Chushnyakova M.V.,Omsk State Transport University
Computer Physics Communications | Year: 2013

We present a C-code designed to obtain the interaction potential between a spherical projectile nucleus and an axial-symmetrical deformed target nucleus and in particular to find the Coulomb barrier, by using the double folding model (DFM). The program calculates the nucleus-nucleus potential as a function of the distance between the centers of mass of colliding nuclei as well as of the angle between the axis of symmetry of the target nucleus and the beam direction. The most important output parameters are the Coulomb barrier energy and the radius. Since many researchers use a Woods-Saxon profile for the nuclear term of the potential we provide an option in our code for fitting the DFM potential by such a profile near the barrier. © 2012 Elsevier B.V. All rights reserved.

Gontchar I.I.,Omsk State Transport University | Kuzyakin R.A.,Omsk State Transport University
Physical Review C - Nuclear Physics | Year: 2011

We have derived approximate analytical formulas describing the quasistationary fission rate of excited nuclei (the Kramers rates). These rates are compared with those resulting from dynamical modeling using the Smoluchowski equation (the dynamical rates). Contrary to the original Kramers approach, we have accounted for the microcanonical nature of the fission process. The influence of the potential at the scission point on the fission rates is also studied. Comparison with the dynamical rates enables us to define the accuracy of the Kramers rates in the wide range of the ratio of the fission barrier height Bf to the temperature at the quasistationary state T c up to 16. These high values are not reachable within the traditional Langevin approach. © 2011 American Physical Society.

Chushnyakova M.V.,Omsk State Transport University | Gontchar I.I.,Omsk State Transport University
Physical Review C - Nuclear Physics | Year: 2013

We attempt to make some progress in the problem of the apparently large diffuseness of the Woods-Saxon strong nucleus-nucleus interaction potential (SnnP) needed to fit a large number of precision fusion excitation functions. This problem has been formulated in Newton. We applied the classical dissipative trajectory model to describe the data on fusion (capture) of 16O with 92Zr, 144Sm, and 208Pb. No fluctuations or dynamical deformations of the interacting nuclei are accounted for. The friction force is supposed to be proportional to the squared derivative of the SnnP (the surface friction model). The SnnP is calculated within the framework of the double-folding model with the density-dependent M3Y NN forces. This potential is known to possess rather small diffuseness in contradistinction to what is required by the data analysis in Newton. Varying slightly the strength of radial friction (universally for all three reactions) and the diffuseness of the charge density of 208Pb we have obtained satisfactory agreement of the calculated excitation functions with the data. © 2013 American Physical Society.

Shiler A.,Omsk State Transport University
Energy Procedia | Year: 2015

For development of railway transport it is important to have reliable, power effective cars. Cars reliability and efficiency strongly depend on a wheel pair construction. To satisf. These needs a wheel pair for a new cars generation was designed. New design has following features: flexible bandage with cylindrical a surface. The wheel center established on own bearings, independent wheel treads. Article investigates design and modeling of new wheel pair movement. Research of wheel pair was conducted using simulation of wheel flange loaded conditions. The optimal flange form is found and analyzed. © 2015 Published by Elsevier Ltd. This is an open access article unde. The CC BY-NC-ND license.

Chushnyakova M.V.,Omsk State Transport University | Gontchar I.I.,Tomsk Polytechnic University
Pramana - Journal of Physics | Year: 2015

Evolution of the fusion cross-section in the 16O+16O reaction has been analysed. It is shown, both analytically and numerically, that in this excitation function some oscillations can be observed. These oscillations are related to the quantum character of the orbital angular momentum increase as well as to the distinct features of the 16O+16O reaction. In order to perform the numerical calculations, the fluctuation-dissipation model and the single barrier penetration model are used. It turns out that the experimental data available in the literature do not have any definite proof about the presence or absence of the oscillations. We stress, that the question still remains unanswered for more than three decades whereas during this time lapse the experimental errors for other reactions are reduced to 1-2%. © Indian Academy of Sciences.

The article applies to the international lexicology in the field of railway engineering. The history of the technology development is closely connected to the development of human society and human language. The level of this development depends on relations among nations. The process of interactions has been developing for many ages. This led to appearing words and notions that are understandable by every scientist and inventor, to international terms. The article is devoted to the origin of such words, their structure and adapting them in many languages.

Demina E.G.,Omsk State Transport University | Gontchar I.I.,Omsk State Transport University
Physics of Atomic Nuclei | Year: 2014

The precision of the Kramers formulas, which are frequently used to calculate the rate of fission of excited nuclei, is studied quantitatively bymeans of a numerical simulation. The deformation dependence of the level-density parameter is taken here into account in contrast to what was done in previous studies on this subject. It turns out that, as the excitation energy becomes lower, the error in the integral Kramers formula decreases monotonically, reaching 2% (precision of dynamical simulation) for a potential-barrier height three to four times greater than the temperature. The approximate Kramers formula obtained from the aforementioned integral formula is in substantially poorer agreement with the results of the dynamical simulation. In the same region of the controlling parameter, its typical error may change sign and reaches 5 to 15%. © 2014, Pleiades Publishing, Ltd.

Pavlova E.G.,Omsk State Transport University | Aktaev N.E.,Omsk State Transport University | Gontchar I.I.,Omsk State Transport University
Physica A: Statistical Mechanics and its Applications | Year: 2012

Accuracy of the Kramers approximate formulas for the thermal decay rate of the metastable state is studied for the anharmonic shapes of the potential pocket and the barrier. This is done by the comparison with the quasistationary rate resulting from the dynamical modeling. Disagreement between the Kramers rate and the dynamical one is shown to reach 15% in the cases when much better agreement is expected. Corrections to the Kramers formulas accounting for the higher derivatives of the potential are obtained. The small parameters are the ratios of the thermal energy to the stiffnesses at the extremes of the potential. The distance between the potential barrier and the absorptive border is accounted for as well. This corrected Kramers rate is demonstrated to agree with the dynamical rate typically within 2%. Probably the most interesting result is that despite the corrections are derived in the case of the overdamped Brownian motion, the above 2% agreement holds even in the case of medium friction. © 2012 Elsevier B.V. All rights reserved.

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