Ufa State Petroleum Technological University

www.rusoil.net
Ufa, Russia

Ufa State Petroleum Technological University - is a technological university in the city of Ufa.In October 1941, Gubkin Russian State University of Oil and Gas was evacuated from Moscow to Ufa. However, in November 1943 the Gubkin University was returned to Moscow.On 4 October 1948, the Ufa Petroleum Institute emerged on the basis of Gubkin Russian State University of Oil and Gas.On 22 November 1993, Ufa Petroleum Institute was renamed to Ufa State Petroleum Technological University. Wikipedia.


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Kuznetsov V.V.,Ufa State Petroleum Technological University
Russian Journal of Organic Chemistry | Year: 2016

DFT quantum chemical calculations with the Perdew–Burke–Ernzerhof (PBE) hybrid functional and triple-zeta (3ζ) basis set showed that the molecule of dimethyl ether encapsulated in model single-walled carbon nanotubes notably changes its structural and conformational parameters: the C–O bonds shorten, the COC bond angle increases, and new stable conformers nonexistent for the free ether appear. Decrease of the nanotube diameter is accompanied by increase of its force field effect on the encapsulated molecule. © 2016, Pleiades Publishing, Ltd.


Rahman P.A.,Ufa State Petroleum Technological University
IOP Conference Series: Materials Science and Engineering | Year: 2017

In this scientific paper a specialized Markov chain for a reliability model of the fault-tolerant system with two types of failures, single batch repair and full restore after reaching the failed state is discussed. The generalized formulas for calculation of the system's stationary availability factor, the mean time to failure and the mean time to repair are also introduced. Application of the special type of the Markov chain in the reliability model of the nested disk array 'RAID-01' and calculation of mean time to data loss by using the generalized formulas are also discussed. The calculation examples of mean time to data loss of the 'RAID-01' array are also given. © Published under licence by IOP Publishing Ltd.


Rahman P.A.,Ufa State Petroleum Technological University
IOP Conference Series: Materials Science and Engineering | Year: 2017

This paper deals with a specialized Markov chain for a reliability model of the fault-tolerant system with dual-type failures, non-synchronized repairs and full restore after reaching the failed state. A generalized iterative procedure for calculation of the system's stationary availability factor, the mean time of repair and the mean time of failure is introduced. An application of the specialized Markov chain in the reliability model of the fault-tolerant dual-level disk arrays 'RAID-10' and calculation of the mean time to data loss by using the generalized iterative procedure are also observed. Finally, calculation examples of mean time to data loss of the RAID-10 array are also given. © Published under licence by IOP Publishing Ltd.


Kuznetsov V.V.,Ufa State Petroleum Technological University
Russian Journal of Organic Chemistry | Year: 2013

The investigation of conformation conversions of cis- and trans-isomers of 2,4-dimethyl-5-isopropyl-1,3,2-dioxaborinane using ab initio quantum-chemical approximation HF/6-31G(d) and the hybrid DFT-method PBE/3z showed that the routes of the transformations presuppose an equilibrium between sofa conformers with the different orientation of substituents at the atoms C4 and C5 of the ring that convert into each other through transition states corresponding to the equatorial and axial conformations of the 2,5-twist form. Based on experimental data of 1H NMR spectra and calculated vicinal spin-spin coupling constants the quantitative conformational composition of cis- and trans-isomers was established and also the ΔGo value of the conformation equilibrium was determined. © 2013 Pleiades Publishing, Ltd.


Kuznetsov V.V.,Ufa State Petroleum Technological University
Russian Journal of General Chemistry | Year: 2016

Relative stability of three molecular forms of diborane in the model single-walled carbon nanotubes has been studied by means of the PBE/3ζ hybrid DFT method. The influence of the force field of the nanotube results in the decrease of the B-B bond length, decrease of the energy difference between the orthogonal and the planar forms, and appearance of high negative charge at the B2H4 molecule. The strengthening of these effects is not related to the length and geometry [(n,n) or (n,0)] of the nanotube, but is determined only by the nanotube diameter. © Pleiades Publishing, Ltd., 2016.


Kuznetsov V.V.,Ufa State Petroleum Technological University
Russian Journal of Organic Chemistry | Year: 2010

Nonempirical RHF/STO-3G and 6-31G(d) studies on conformational behavior of tetrahydro-1,3- oxazine showed that interconversion between the axial (global minimum) and equatorial chair conformers can follow five independent pathways. The potential energy surface contains seven minima corresponding to chair and twist conformers, as well as seven transition states having sofa, half-chair, and symmetrical and unsym- metrical boat conformations. Additional potential barriers to interconversion, resulting from pyramidal inversion of the nitrogen atom, were also revealed. © 2010 Pleiades Publishing, Ltd.


Kuznetsov V.V.,Ufa State Petroleum Technological University
Russian Journal of Organic Chemistry | Year: 2016

According to HF and DFT quantum chemical calculations and 1H NMR data, the chair–chair conformational equilibrium of 5-methyltetrahydro-1,3-oxazine shifts toward the conformer with equatorial orientation of the methyl group on C5 and axial orientation of the NH proton. 3,5-Dimethyltetrahydro-1,3-oxazine exists preferentially as chair conformer with equatorial orientation of the 5-methyl group; orientation of the N-methyl group almost does not affect the conformational equilibrium. © 2016, Pleiades Publishing, Ltd.


Kuznetsov V.V.,Ufa State Petroleum Technological University
Russian Journal of General Chemistry | Year: 2012

Conformational isomerization of 5-methyl- and 2,2,5-trimethyl-1,3-dithianes was studied using quantum-chemical HF/6-31G(d), HF/pVDZ, and PBE/3z approximations. The potential energy surface of molecules of both compounds is shown to contain the main minimum corresponding to the equatorial chair conformer C-5e. The calculated potential barriers of the conformational isomerization were found. Based on the experimental ( 1H NMR) and theoretical vicinal coupling constants the ΔG 0 values were determined of the methyl group at the ring C 5 atom. The reasons for the distinctions between the values of this parameter from the ΔG 0, obtained by energy minimizations of the equatorial and axial chair conformers are discussed. © 2012 Pleiades Publishing, Ltd.


Pestryaev E.M.,Ufa State Petroleum Technological University
Journal of Physics: Conference Series | Year: 2011

This investigation presents data from prolonged molecular dynamics simulations of dense monodisperse polymer melts of linear polymer chains of length between N = 3 and N = 255. Hear N is number of chain coarse-grained segments. The study aim is to observe the crossover from Rouse-like dynamics for short chains to reptation-like dynamics for long chains and its influence on various translational and orientational correlation times. To address the problem, we calculate a variety of different quantities: standard mean-square displacement of inner monomer and of the chain mass centre, autocorrelation function of chain end-to-end vector, orientational autocorrelation functions of segment and chain end-to-end vector. The last two functions define NMR relaxation in polymer melts. The chain length dependences of all large-scale correlation times reveals clear crossover from non-entangled to entangled dynamics near N C ≈35. Additional primitive path analysis of the same data gives statistically consistent entanglement value N E ≈14, i.e., the longest chain investigated is well entangled and displays explicit motional anisotropy. The full data assembly explains qualitatively strong dependence of NMR transverse relaxation time for Rouse-like regime and weak one in reptation regime.


Kuznetsov V.V.,Ufa State Petroleum Technological University
Russian Journal of Organic Chemistry | Year: 2014

According to DFT PBE/3z calculations, conformational transformations of 1,1,1-trifluoroethane molecule in model single-walled carbon nanotubes are determined primarily by the diameter of the latter. Reduction of the nanotube diameter is accompanied by displacement of the conformational equilibrium toward the eclipsed structure. © 2014 Pleiades Publishing, Ltd.

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