Kazakh-British Technical University

www.kbtu.kz
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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Kharin S.N.,Kazakh-British Technical University
ICEC 2016 - 28th International Conference on Electric Contacts | Year: 2016

The modern tendency to use of increasingly high current and contact load leads to the situation at which the initial stage of contact opening is so small that the temperature on a contact spot has no time to become even and its maximum is displaced to the rim of a contact spot where the current density is maximal. It leads to the ring-shaped welding in closed contacts if the time of the current passing is small. This phenomenon was observed experimentally especially for refractory contact materials. Similar shape of welding may occur also in opening contacts if a contact velocity is not sufficiently high. The mathematical model describing the dynamics of such welding should take into account the appearance of a hollow liquid-metal bridge between opening contacts. Such model of the hollow- bridge is presented in this paper The dependence of bridge dynamics on such parameters of contact materials as heat conductivity , electric resistivity, surface tension coefficient, specific heat of fusion and evaporation, inductance etc. are discussed. Results of calculation are compared with the experimental data.


Brabenec T.,J.E. Purkyne University in Ústí nad Labem | Montag J.,Kazakh-British Technical University
Journal of Quantitative Criminology | Year: 2017

Objectives: This paper tests the economic theory of criminal behavior. Specifically, it looks at “the carrot” side of the theory, studying how thieves react to changes in monetary gains from crime. Methods: Using a unique crime-level dataset on metal theft in the Czech Republic, we study thieves’ behavior in a simple regression framework. We argue that variation in metal prices represents a quasi-experimental variation in gains from crime. It is because (1) people steal copper and other nonferrous metals only to sell them to scrapyard and (2) prices at scrapyards are set by the world market. This facilitates causal interpretation of our regression estimates. Results: We find that a 1% increase (decrease) in the re-sale price causes metal thefts to increase (decrease) by 1–1.5%. We show that the relationship between prices and thefts is very robust. Moreover, we find that thieves’ responses to price shocks are rapid and consistent. Conclusion: Our results are in line with the economic model of crime, wherein criminal behavior is modeled as a rational agent’s decision driven by the costs and benefits of undertaking criminal activities. Our estimates are also consistent with recent results from the United Kingdom, suggesting these patterns are more general. © 2017 Springer Science+Business Media New York


Azhibekova A.S.,Kazakh-British Technical University
AIP Conference Proceedings | Year: 2016

In this paper we are concerned with the problem of determining a coefficient in a parabolic equation using an iterative approach. We investigate an inverse coefficient problem in the difference form. To recover the coefficient, we minimize a residual functional between the observed and calculated values. This is done in a constructive way by fitting a finite-difference approximation to the inverse problem. We obtain some theoretical estimates for a direct and adjoint problem. Using these estimates we prove monotonicity of the objective functional and the convergence of iteration sequences. © 2016 Author(s).


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.


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.


Grant
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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