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Search Results: 1 - 10 of 358 matches for " Aleksandr Rakhmangulov "
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Mathematical Model of Optimal Empty Rail Car Distribution at Railway Transport Nodes
Aleksandr Rakhmangulov,Anatoliy Kolga,Nikita Osintcev,Ivan Stolpovskikh,Aleksandr Sladkowski
Mathematics , 2015,
Abstract: At present there are two trends in the market of rail freight transportation in Russia: freight owners put forward higher demands to the transportation quality (promptness of delivery) in an effort to reduce storage costs by means of reducing the size of freight shipment; the structure of railcar traffic volume of the railways of Russia is getting more complex due to the reduction of the average shipment size and due to the transfer of railcar fleet ownership to a large number of operating companies. These trends significantly complicate operational management supervision of railway stations and transport nodes. Application of typical data from the information system about the railcar location at the transportation node is not enough for the dispatchers to make the best decision concerning the car traffic management. The article is concerned with the description and development of the mathematical model of empty railcar distribution for loading at the railway transport node; this model will take into account the requirements of railcar owners in terms of their cars application, the operating work level of railroad stations of the transportation node and the possibility of adding the groups of empty railcars to the transfer trains, clean-up trains and industrial railway trains operating on a tight schedule. The developed model and the software package were implemented in the information system of the industrial railway of the major metallurgical enterprise - OJSC "Magnitogorsk Metallurgical Works", which processes up to two thousand of railcars belonging to different owners. This model made it possible to reduce the labour intensity of dispatcher operation planning the empty railcar distribution for loading and reduce the total time the railcars spend in the enterprise railway system.
Pt-Al2OM3 Composite Material Designed for Cyclic Production of Optical Glasses under High Temperature Conditions  [PDF]
Aleksandr Bochegov, Aleksandr Ermakov, Irina Vandysheva
Journal of Materials Science and Chemical Engineering (MSCE) , 2014, DOI: 10.4236/msce.2014.23004

The article considers one of the possible approaches to the solution of an urgent issue of metal consumption reduction, increase of operating life and maximum operating temperature as well as reduction of irrecoverable losses of platinum products and alloys when operating under high temperature conditions, particularly for glassblowing and single crystal growing crucibles. A two-layered composite material based on platinum-group metals and corundum plasma ceramics is thoroughly investigated. A successful experience of crucibles exploitation, designed for production of high temperature optical glasses from the composite and results of the research on composite material specimens are described.

Determination of the Optimal Speed of Pultrusion for Large-Sized Composite Rods  [PDF]
Aleksandr Krasnovskii, Iliya Kazakov
Journal of Encapsulation and Adsorption Sciences (JEAS) , 2012, DOI: 10.4236/jeas.2012.23004
Abstract: The paper describes a mathematical model of the stress-strain state of polymer composite materials in the pultrusion process of large-sized products. The influence of the pull speed on the stress-strain state of the products is investigated. To determine the maximum possible pull speed series of solutions at different pull speeds are obtained. Depending on the maximum strain in the cross section of the rod determined the optimal value of pulling speed.
Lows of Wear Process of the Friction Pair “0.45% Carbon Steel—Polytetrafluoroethylene” during Sliding from the Position of Fracture Mechanics  [PDF]
Aleksandr V. Bogdanovich
World Journal of Mechanics (WJM) , 2019, DOI: 10.4236/wjm.2019.95007
Abstract: The results of the tests for a friction pair “a cylindrical specimen made of 0.45% carbon steel—a counter specimen-liner made of polytetrafluoroethyleneF4-B” during sliding friction are presented. The test results at different levels of contact load are analyzed using the Archard’s equation and are presented as a friction fatigue curve. The concept of the frictional stress intensity factor during sliding friction is introduced, and an expression that relates the wear rate to this factor and is close in shape to the Paris equation in fracture mechanics is proposed.
Self-Directed Performance Testing
Aleksandr Sukhorukov
Scientific Journal of Riga Technical University. Computer Sciences , 2010, DOI: 10.2478/v10143-010-0028-4
Abstract: Performance testing of multi-user software systems is typically performed by emulating activities of multiple users working with the system simultaneously. These virtual users collect performance measures like response time and correctness while loading the system during the test. During a typical load scenario number of simultaneous virtual users gradually increases from one to some intended maximum, allowing to find out statistical relation between number of simultaneous users and performance measures. However having fixed load scenario has several drawbacks. Usually the test has to be repeated iteratively with adjusted load scenarios, taking into account results acquired from previous test iterations. As load scenarios have to be adjusted manually and repetitions of the test may take considerable time, this approach seems to be ineffective. This paper presents an alternative approach, where load scenario is adjusted automatically during the test, taking into account performance measures already gathered in the same test. Drawbacks of fixed load scenarios are analysed and methods of eliminating them by automatic adjustment are described. A case study showing implementation of the method and results obtained by applying it to performance testing of a real system is provided.
On the Methods of Constructing a Mythological Text: Slavic Folk Beliefs regarding the Spots of the Moon
Aleksandr Gura
Folklore : Electronic Journal of Folklore , 2010,
Abstract: The dark spots visible on the surface of the full Moon have beendiversely interpreted in the Slavic folk calendar, with a partial overlapping being noted upon the consolidation of relevant thematic groups. The article provides an overview regarding the explanations, concerning the origin of lunar spots, widespread among the Slavic people. The comparative analysis of the Slavic narratives on lunar spots indicates the distribution of the text into differentmorphological elements, enables the ascertaining of mutual correlations and combinations, and shows how they are being used to “assemble”, construct texts in different regional traditions, determining the “grammatical” structure of the mythological text as a whole.
Problemy opisanija russkogo sintaksisa v semanti eskom aspekte
Kiklevi? Aleksandr
Ju?noslovenski Filolog , 2009, DOI: 10.2298/jfi0965125k
Abstract: V stat'e rassmatrivajutsja spornye problemy semanti eskogo opisanija russkogo sintaksisa. Avtor rassmatrivaet modelirovanie semanti eskoj struktury predlo enija v perspektive ontologi eskogo determinizma i jazykovoj otnositel'nosti, rol' grammati eskih kategorij v realizacii sintaksi eskoj semantiki. Osobennoe vnimanie v svjazi s etim udeljaetsja probleme razgrani enija objazatel'nyh ili neobjazatel'nyh komponentov predlo enija, t. e. konstituentov i ad''junktov. Rassmatrivaja javlenie sintaksi eskoj omonimii, avtor prider ivaetsja to ki zrenija, to ponimanie omonimi nyh konstrukcij v re i opiraetsja ne tol'ko na grammati eskie modeli predlo enija, no v bol' ej stepeni - na leksiko-semanti eskij sostav predlo enija. Semanti eskaja struktura predlo enija, v predstavlenii avtora zavisit ot naivnoj kartiny mira.
Russia Abroad: sources of historical research and their evolution
Aleksandr Pronin
Koncept : Scientific and Methodological e-magazine , 2013,
Abstract: Report about the book Russian abroad: sources of historical researches, their evolution .
The calculation of the optimum parameters to customize the contour three-pulse billing system supply of steam boilers with the phenomenon of "swelling" level in the drum
Aleksandr Grinev
Koncept : Scientific and Methodological e-magazine , 2013,
Abstract: The article is devoted to the calculation of the optimal settings automatic control system (ASR) level in the boiler steam drum with the phenomenon of "swelling level" typical for boilers with nekipyaschim economizer. The article can be useful for specialists in the field
Mesilane slaavi kultuuri sümbolkeeles
Aleksandr Gura
M?etagused. Hüperajakiri , 2004,
Abstract: Folk tradition explains each animal through an invariable and complete group of characteristic features, which correlates with a group of characteristic features inherent of a given character in specific local traditions. The cultural language of each tradition prefers some qualities, attributes, predicates, etc. of the animal to others, and attaches symbolic significance to these, while excluding others from the cultural frame and context. In this case one and the same animal can inspire widely different, often unassociated symbolic meanings. The article observes the mechanisms of symbolisation inherent to cultural language through a creature well known in popular zoology - the bee. Bee is thought to be superior of other insects because of its divine heavenly nature. Of all other insects only ladybird beetle and silkworm have been attributed similar superiority. In etiological legends bees, as the creation of God, are opposed to bumblebees, hornets, wasps or flies created by the Devil. The Slavonic people honour bee as a pure creature of God. The texts and apicultural traditions of the Slavonic people associate the bee also with the Mother of God. Folk tradition attributes the bees purity and sacredness, but also virginity and celibacy. Their chthonic qualities become evident in a motif of their originating from a cave of a mythical rock, etc. The superiority of Christian thinking over paganism in these beliefs can be explained by the special role of apiculture in folk tradition in general. This autonomous and esoteric sphere of culture, practised only by men or professional apiculturists, became the preserver of the archaic layer of ancient traditions and beliefs, but was also susceptible to the influence of literature (often mediated by beekeepers as an educated class of village community). The spread of literature greatly contributed to the penetration of Christian elements in this sphere of tradition.
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