Vologda State Technical University

www.vstu.edu.ru
Leninaul, Russia

Vologda State Technical University , is the largest technical university of the Vologda oblast in Russia. Wikipedia.


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Ruban A.V.,KTH Royal Institute of Technology | Popov V.A.,Vologda State Technical University | Portnoi V.K.,Moscow State University | Bogdanov V.I.,Vologda State Technical University
Philosophical Magazine | Year: 2014

The energetics and structural properties of native, substitutional and interstitial defects in NiAl have been investigated by first-principles methods. In particular, we have determined the formation energies of composition conserving defects and established that the so-called penta defect, which consists of four vacancies on Ni sublattice and Ni antisite on the Al sublattice, is the main source of vacancies in NiAl. We show that this is due to the strong Ni-site preference of vacancies in NiAl. We have also calculated the site substitution behaviour of Cu, Pd, Pt, Si, Ti, Cr, V, Nb, Ta and Mo and their effect on the concentration expansion coefficient. We show the latter information can used for an indirect estimate of the site substitution behaviour of the alloying elements. The solution energy of carbon and its effect on the lattice constant of NiAl have been obtained in the dilute limit in the first-principles calculations. We have also determined the chemical and strain-induced carbon-carbon interactions in the interstitial positions of NiAl. These interactions have been subsequently used in the statistical thermodynamic simulations of carbon ordering in NiAl. © 2013 Taylor & Francis.


Aleksandrov I.K.,Vologda State Technical University
Russian Engineering Research | Year: 2010

Methods of calculating frictional losses in machines need to be modernized. Models are proposed for the energy calculation of multilink and branched kinematic chains. © 2010 Allerton Press, Inc.


Utkin V.S.,Vologda State Technical University | Shepelina E.A.,Vologda State Technical University
Magazine of Civil Engineering | Year: 2013

This article deals with a safety problem of upkeep of buildings and structures, specifically soil reliability according to the strength criterion with absolutely limited information about pressure by building foundation on the ground. For solving the problem of pressure of foundation on the ground the new ways for calculating reliability and for the first time truncated distribution for description of random value were used. Calculated reliability of foundation is expressed as an interval of numeric values. Design equations for determination of upper and lower values of reliability in the interval, method of risk calculation are presented in the article. Solutions on the definite value of foundation reliability by the estimated range of reliability are applied.


Utkin V.S.,Vologda State Technical University
Soil Mechanics and Foundation Engineering | Year: 2014

Methods of in-service analyses of the safety of the soil beds of structures based on the bearing-capacity criterion are examined when statistical information on controllable parameters of computational limiting-state models is restricted (incomplete). Approaches are proposed for analysis with use of adjunct functions (from possibility theory) and distribution functions of random numbers obtained from a Chebyshev inequality. © 2014 Springer Science+Business Media New York.


Sokolov L.I.,Vologda State Technical University
Life Science Journal | Year: 2013

Wet dispersed wastes are classified in terms of rheological properties and textural features. Rheological models of non-Newtonian liquids by Newton, Bingham, Ostwald, Herschel-Bulkley are presented. On example of suspensions of grinding sludge using viscometric studies complete rheological curves have been obtained, rheological properties of sludges have been studied, and rheological constants have been determined: yield point, flow index and consistency index. It has been established that strength, yield point, viscosity, stability of sludges are determined by dispersity, bonding energy between solid particles and interaction of disperse phase of sludge with its disperse medium. On the basis of tube viscometer design a commercial facility has been developed for determination of pressure loss within pipeline transportation of sludges and their suspensions. Pressure loss as a function of flow velocity of slurries in 150 mm pipeline has been established. Critical flow velocity of sludge suspensions in commercial pipelines have been determined.


Sinitsyn A.A.,Vologda State Technical University
Life Science Journal | Year: 2013

The article examines the efficiency of the use of radiation and convective method applied to the creation of a new mobile device for thawing of frozen soils. We present a study sets the existing devices, methods and techniques used for thawing of frozen soil, elicit their disadvantages. The requirements for a new device are defined, for example the time for thawing of 1 m2 of frozen soils should be no more than 3 hours. The requisite thermal power of the device is defined (15 kW), as well as the relation of the depth of freezing and time based on the proposed mathematical model and the results of natural and laboratory tests. The article also reviews the technical characteristics, principle of function, general form and the main advantages of the new mobile radiation and convective device. It gives an assessment of the device efficiency based on the comparative characteristics of technical means. The fulfilled work and studies have shown the expediency of radiation-convective method for thawing frozen soils.


Sinitsyn A.A.,Vologda State Technical University
Life Science Journal | Year: 2013

In this paper we propose a new method of studying the nature of the vibration component for the pressure change over time for the energy device that permits to work out the start-stop mode, run mode of the continuous operation and the shutdown of the energy device, the transient modes, when you change the basic (a resonance frequency, a flow and composition of fuel and air) and additional (a fuel pressure, a working medium temperature) operation parameters of the energy device, gives you the opportunity to register and process the measurement results to compare the frequency characteristics at various points of the devices working space, to evaluate the presence of defects in their work. The literary and the patent survey have showed that this method is not currently used, and the devices implementing such a method, are not available on the measuring devices market. The application of measuring complex based on the proposed method, will allow us to try out engineering technique of the design and verification calculations of the devices based on a vibrating, pulsating or detonation fuel combustion, and to apply the energy efficient devices of the energy complex for the further branch development. The author has identified the main problems of the pilot plant development for the measuring complex, the character of the vibration component for the pressure change over time for the energy device, and also the numerical and full-scale tests were carried out. The prototype of measuring complex that implements all the features of this method was developed. The tests on the operating boiler of intermittent burning PV-400, installed in the hot water boiler house in one of the academic buildings of the Vologda State Technical University were made. Based on the simulation results were developed the recommendations on improving the design technology of the pulsating combustion boilers. The results were transmitted and implemented at the enterprise, which produces such boiler units. This work was financially supported by the Ministry of Education and Science of the Russian Federation.


Sokolov L.I.,Vologda State Technical University
Life Science Journal | Year: 2013

The demand for comprehensive monitoring of hazardous wastes at dumps and landfills using a network of monitoring wells constructed in the sanitary protection zones is proved in this paper. The quality of drainage water entering the environment from old landfills and dumps is reported. The effect of pollution on groundwater quality in technological accumulations of industrial wastes of an old landfill of a machine-building plant is studied. The method for assessing the security conditions of pressure water depending on filtration duration of contaminated water from the first aquifer to the pressure horizon for an aquiclude distributing these horizons is shown. The flow rate of polluted water in a stratum under the action of natural underground water flow is calculated. The area of possible soil and water pollution with time is calculated with allowance for soil porosity. The isolation scheme for a landfill having no basic isolation is elaborated. The sanitation method for old landfills and industrial dumps is shown. An alternative to the old landfills with the controlled pollutant leaks is presented.


Sinitsyn A.A.,Vologda State Technical University
Life Science Journal | Year: 2013

The paper presents the main results of the effectiveness of the device to create high-quality indoor climate developed by scientific-educational center "Teploengeretika" of Vologda State Technical University. Brief information is given about the device, which can be applied in the standard window unit with minimum energy consumption providing the required ventilation of premises with preservation of up to 50% of the heat energy lost from the airing, as well as reduced consumption of electrical energy for ventilation. It describes the main problems of maintaining the microclimate in modern buildings and structures both in Russia and abroad. Device test in actual practice shows its efficiency, moreover, air, that entered the room, has been heated at a temperature above ambient temperature, which favorably acts on the person and does not create discomfort. Research has social and public importance, ensuring the health of people living and working in buildings with plastic windows and absence of ventilation as such.


The local magnetic moments and the magnetic susceptibilities of aluminum clusters containing Fe, Co, or Ni impurities are calculated in terms of a local spin density and the model "atom embedded into spherical jellium." The clusters contain up to 100 atoms. The 3d impurities can be either magnetic or nonmagnetic depending on the cluster size. The magnetic susceptibility is an oscillating function of the cluster size: it is positive for an iron impurity in aluminum clusters, near zero for cobalt, and negative for nickel. The calculation results agree with the experimental data obtained for aluminum-based dilute alloys. © 2012 Pleiades Publishing, Ltd.

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