Kazakh-British Technical University

Almaty, Kazakhstan

Kazack-British Technical University, or KBTU is a research and educational institution located in Almaty, Kazakhstan. Founded in 2001, KBTU is one of the most prestigious research and education institutions in the region. Wikipedia.

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Poulopoulos S.G.,Kazakh-British Technical University
Reaction Kinetics, Mechanisms and Catalysis | Year: 2016

The catalytic oxidation of ethanol in the gas phase over Pt/Rh and Pd monolithic catalysts was performed in a spinning basket flow reactor with the aim of studying kinetics. The reactor was operated under atmospheric pressure and reaction temperature was varied between 50 and 300 °C. The inlet concentrations of ethanol and oxygen were in the range of 0.0060-0.0240 μmol/mL and 0.10-10.0 % v/v, respectively. Gas chromatography was used to follow the progress of the oxidation. Carbon dioxide and small amounts of methane and acetaldehyde were the only products detected in ethanol oxidation over the catalysts tested. Various kinetic models were tested in the analysis of the experimental data obtained. The Marquardt-Levenberg method was used for the minimization of the objective function for the residual sum of squares. The model that takes into account the surface reaction between adsorbed reactants was found to yield the most successful fit for both catalysts. According to this model, the activation energy of ethanol catalytic oxidation over Pt/Rh and Pd is 7903 and 6571 cal mol-1, respectively. © Akadémiai Kiadó, Budapest, Hungary 2015.

Kharin S.N.,Kazakh-British Technical University
Electrical Contacts, Proceedings of the Annual Holm Conference on Electrical Contacts | Year: 2015

Mathematical models describing phenomena of heat and mass transfer in electrical contacts are based on systems of partial differential equations for temperature and electromagnetic fields. The influence of Joule, Kohler and Thomson heat sources on the temperature field in closed contacts is discussed. The mathematical model of the ring-shaped welding in closed contacts is presented. Dynamics of contact opening is considered as consecutive stages including the initial stage of heating up to the melting point, the stage of a liquid bridge, metallic and gaseous arc stages. The dimensionless criteria of Thomson and Kohler are introduced which may be responsible for the displacement of the hottest isotherms of a bridge from its middle and corresponding bridge material transfer. The conditions for self-restrained bridge transfer are discussed. Phenomenon of contact floating due to metallic vapour pressure produced by a vacuum micro-arc is investigated experimentally and then described by a mathematical model. A mathematical model is presented describing transient phenomena accompanied a vacuum short arc at the initial stage of contact opening. It enables to describe the evolution of transient short anode dominated arc, which appears just after the rupture of molten bridge, into diffusive cathode dominated arc. The mechanisms of arc erosion are described by several models due to evaporation, droplets ejection, Marangoni effect, ejection of solid particles at thermo-elastic stresses. The hybrid mathematical model is elaborated to describe dynamics of the arc and forces acting in contact gap. It includes experimental oscillograms of current, voltage and contact displacement and nonlinear equations for arc, anode and cathode temperature fields and contact motion. It is shown theoretically and confirmed experimentally that in the range of high current the force of metallic vapour pressure at arcing in vacuum is comparable with magnetic repulsion force and should be taken into consideration.The mathematical model describing transition from arc to glow at contact opening in circuits with a high inductance and small current is elaborated and identified experimentally. The mechanism of thermionic emission from the cathode surface based on Richardson-Dushman equation is corrected by addition of another emission mechanism due to electrochemical phenomena in melted pool on the cathode. The influence of current frequency on the rate of the arc erosion at contact opening is investigated using the model of transition of the metallic arc phase into gaseous phase. © 2015 IEEE.

Kornev A.,Kazakh-British Technical University
Communications in Computer and Information Science | Year: 2015

The image preprocessing and the skeleton orientation method are applied to segment a texture image with structure-oriented patterns. The technique is incorporated with a spatially adaptive classification of geometric features. The algorithm is tested on a set of artificial images and X-ray tomography scan of titanium alloy. The results are presented and discussed. © Springer International Publishing Switzerland 2015.

Trubitsin O.,Kazakh-British Technical University
Communications in Computer and Information Science | Year: 2015

With the growing popularity of cloud computing and large number of providers, it is necessary to select the most appropriate service. To select a suitable provider the user needs to browse a huge list of providers. To solve this problem, the customer can use a third-party service called a cloud broker. One of the problem we faced during the developing cloud broker framework is a lack of API standards. Every provider has its own protocol for deploying services. This paper describes a new approach to construct a protocol for communication between the client and the provider. It is based on the use of mediators, which, depending on the selected service capable to convert messages from a format of one particular provider to a format of another provider. All the processes described in a specific example of Google Compute Engine client and Digital Ocean server interactions for deploying the service. In addition, during the development of mediators was introduced a new operator “sync” to synchronize the set of answers to one. © Springer International Publishing Switzerland 2015.

Bruggemann R.,Leibniz Institute of Freshwater Ecology and Inland Fisheries | Carlsen L.,Awareness Center | Carlsen L.,Kazakh-British Technical University
Match | Year: 2011

Comparison of objects characterized by a multitude of criteria will typically not lead to a linear order, but to a partial order. However, often a linear order is desirable or even required. The present paper presents an improved - extended - approximate local partial order model to estimate a weak or linear order based on averaged ranks of the studied objects originally being partially ordered. The paper analyses various possible partial order scenarios by means of the new local partial order model, the results being compared to the original approach as well as to exact values (their calculation can be extremely time consuming), demonstrating a distinct improvement of the extended method compared to the original local partial order ranking method. By the approximate methods the values of averaged ranks can be understood in terms of three basic partial order parameters. The method is applied to current research on human health effects of rocket fuel transformation products.

Dzhumadil'daev A.,Kazakh-British Technical University
Letters in Mathematical Physics | Year: 2014

We show that a space of one variable differential operators of order p admits non-trivial 2p-commutator and the number 2p here can not be improved. © 2014 Springer Science+Business Media Dordrecht.

Bruggemann R.,Leibniz Institute of Freshwater Ecology and Inland Fisheries | Carlsen L.,Awareness Center | Carlsen L.,Kazakh-British Technical University
Science of the Total Environment | Year: 2012

The paper of Huang, Keisler and Linkov (HKL) (Huang et al., 2011) has motivated us to this note about the relation between ranking procedures and Multi-Criteria Decision Analysis (MCDA) tools. The key concept in the HKL-paper is in our eyes the 'trade-off'. A 'trade-off' seems necessary, when conflicting indicator values are present. HKL stress that the general application of MCDA is hampered by different terminology. We do not claim to have a solution for that problem. Nevertheless, we think that the discussion is worthwhile and this note presents some of our ideas, which basically imply the need of a broadening of the definition of MCDA. © 2012 Elsevier B.V.

Agency: European Commission | Branch: FP7 | Program: CSA | Phase: INFRA-2010-3.3 | Award Amount: 871.70K | Year: 2010

The FP7 EDGeS project has successfully set up a production-level distributed computing infrastructure (DCI) consisting of more than 100.000 PCs from several volunteer and low-cost Desktop Grids, which have been connected to existing Service Grids (including EGEE, SEE-GRID, etc. with about 150.000 processors) based on the new 3G Bridge technology and application development methodology.\n\nThe main aim of the DEGISCO project is the further extension of the European DCI infrastructure that is already interconnected by EDGeS to International Cooperation Partner Countries (ICPC) in strong collaboration with on the one hand local partners in ICPC countries and on the other hand European e-Infrastructure experts (including 3G Bridge know-how) and thus, reinforce the global relevance and impact of European distributed infrastructures.\n\nThe project will support the creation of new Desktop Grids in ICPC countries and the connection of these Grids to European DCIs and existing Service Grids in ICPC countries by employing 3G Bridge technology. Moreover, building on the solid expertise of the DEGISCO partners, the project will provide recommendations on best practices and define joint roadmaps for ICPC countries and Europe.\n\nThe application support activities of DEGISCO support the use of the already two dozen ported applications on new connected DCIs in ICPC countries and support new applications.\n\nThe dissemination and training activities will promote via various channels such interoperation between Desktop Grid and Service Grid infrastructures on a global scale, which leads to more awareness under the general public of computational science and distributed computing co-funded by the EC. As a result more citizens, students, and companies are expected to donate resources to scientific purposes.\n\n\nAs part of these activities an International Desktop Grid Federation will be operated allowing for effective exchange of information through participation.

Sheikh-Ali A.D.,Kazakh-British Technical University
Acta Materialia | Year: 2010

Stress-induced behavior of high-angle near-coincidence symmetric tilt boundaries has been examined in bicrystal specimens of zinc. Parameters of coupling between boundary sliding and migration were determined. The angular deviation from the coincidence misorientation within the range of boundary specialness has a noticeable effect on the sliding-to-migration ratio, called "coupling factor". Mechanisms of coupled boundary sliding and migration based on the motion of edge-type extrinsic and intrinsic grain boundary dislocations are discussed. It has been demonstrated that the observed alteration of the coupling factor with the change in boundary misorientation is due to the change of the parameters of extrinsic secondary grain boundary dislocations. The obtained results have also shown the limitation of the coincidence site lattice/displacement shift complete lattice model for the quantitative description of the structure of near-coincidence boundaries. © 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Korobkin V.V.,Kazakh-British Technical University | Buslov M.M.,RAS Institute of Geology and Mineralogy
Russian Geology and Geophysics | Year: 2011

On the basis of stratigraphical and geological data, paleogeographical and palinspastic reconstructions of the Kazakhstan Paleozoides were done; their multistage geodynamic evolution was considered; their tectonic zoning was proposed. The main stages are described: the initiation of the Cambrian and Ordovician island arcs; the development of the Kazakhstan accretionary-collisional composite continent in the Late Ordovician as a result of continental subduction and the amalgamation of Gondwana blocks with the island arcs (a long granitoid collisional belt also formed in this period); the development of the Devonian and Carboniferous-Permian active margins of the composite continent and its tectonic destruction in the Late Paleozoic.In the Late Ordovician, compensated terrigenous and volcanosedimentary complexes formed within Kazakhstania and developed in the Silurian. The Sakmarian, Tagil, Eastern Urals, and Stepnyak volcanic arcs formed at the boundaries with the Ural, Turkestan, and Junggar-Balkhash Oceans. In the late Silurian, Kazakhstania collided with the island arcs of the Turkestan and Ob'-Zaisan Oceans, with the formation of molasse and granite belts in the northern Tien Shan and Chingiz. This was followed by the development of the Devonian and Carboniferous-Permian active margins of the composite continent and the inland formation of the Early Devonian rift-related volcanosedimentary rocks, Middle-Late Devonian volcanic molasse, Late Devonian-Early Carboniferous rift-related volcanosedimentary rocks, terrigenous-carbonate shelf sediments, and carbonaceous lake-bog sediments, and the Middle-Late Carboniferous clastic rocks of closed basins. In the Permian, plume magmatism took place on the southern margin of the Kazakhstan composite continent. It was simultaneous with the formation of red-colored molasse and the tectonic destruction of the Kazakhstan Paleozoides as a result of a collision between the East European and Kazakhstan-Baikal continents. © 2011.

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