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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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: 2017

DFT PBE/3ζ study of the structure and conformations of 1,1,1-trifluoroethane molecule encapsulated in fullerenes C60 and C80, as well as in their analogs with boron–nitrogen units, showed that the encapsulated molecule is characterized by shortened C–C bond, negative charge, and considerably increased barrier to rotation about the carbon–carbon bond. All mentioned effects diminish in the case of C60 doped with boron and nitrogen atoms. © 2017, Pleiades Publishing, Ltd.


Mukhametshin V.V.,Ufa State Petroleum Technological University
Neftyanoe Khozyaystvo - Oil Industry | Year: 2017

We proposed and implemented a method of comprehensive geological-field analysis and integration of data on the effectiveness of various types of impact on the bottom-hole formation zone. The method is based on the use of: reasonable sufficiency of information on the process for solving technology problems of selection, well, conditions and impact parameters; the list of uniform and identical information available to subsoil users; the set of performance criteria that reflect different aspects of the impact process. The method makes it possible to objectively and comprehensively compare the results of different methods of influence on the bottom-hole formation zone. It allows to create the basis for an exposure technology objective selection in a variety of geological and field conditions. Besides one can choose a technology by the performance indicators, which can satisfy the needs of enterprises in a specific situation, taking into account market realities, climatic conditions, geopolitical situation and other both external and internal factors. In terms of oil deposits with hard to recover reserves in Western Siberia, the analysis and generalization of the bottom hole zone for influence results were made using the proposed method. The received results allow managers to make correct decisions to improve the efficiency of the impact both on the analyzed fields, and similar to them for their geological and commercial response.


Kuznetsov V.V.,Ufa State Petroleum Technological University
Russian Journal of General Chemistry | Year: 2017

Investigation of conformational transformations of hexahydropyrimidin-2-one in the cavity of nanotubes with chirality indices (5,5) and (8,0) using DFT-method PBE/3ζ has shown that the encapsulated heterocyclic system has shortened С–N bonds, elongated С=О bond, bears an electric charge and is characterized by an increased potential barrier of interconversion as compared to the free molecule. In the case of (4,4) nanotube, a virtual reaction of the molecule in the cavity with the carbon atoms of the nanotube occurs. © 2017, Pleiades Publishing, Ltd.


Anvar V.,Ufa State Petroleum Technological University
AIP Conference Proceedings | Year: 2017

The article is devoted to the idea of metamaterials with quasi-zero stiffness for vibration isolation. Metametarials can provide a special and unique material properties. Principles of systems with quasi-zero stiffness can be applied in this researches. Metamaterial with a low rigidity in a certain point. Consequently, low natural frequency vibration isolation and high efficiency can be obtained. Computer simulation shows a large enough margin of safety, and proves the existence of forces with quasi-zero stiffness characteristics. The calculation showed that the metamaterial has a natural frequency below 1 Hz. Experimental study shows force characteristics with quasi-zero stiffness. So, this metamaterial can be very effective and compact mean of vibration isolation. © 2017 Author(s).


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 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.


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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