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Search Results: 1 - 10 of 138839 matches for " K. Babich "
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Animal behaviour with respect to tourists in the Kruger National Park
B.Sc. (Eng.), K. Babich
Koedoe : African Protected Area Conservation and Science , 1964, DOI: 10.4102/koedoe.v7i1.807
Abstract: Animal behaviour with respect to tourists in the Kruger National Park
Visualisation of a mathematical model of blast furnace operation for distance learning purposes
Babich, A.,Senk, D.,Gudenau, H. W.,Mavrommatis, K.
Revista de Metalurgia , 2005,
Abstract: Advanced educational technologies like Virtual Laboratories are being developed and launched in order to equip customers from higher education institutions, research and industry with efficient tools, supporting their work and operating new skills-training methods. Visual Model "Blast Furnace" based on a mathematical balance model of the blast furnace process has been developed for distance learning (DL) purposes. It processes entered parameters and outputs both operating and learning results. The model simulates also sinter and pellets manufacture as well as operation of hot stove. The teacher and learners can interact with each other using software interface which allows to monitor the activity of the learners, answer their questions, and analyse the learning results. The model is an ingredient of the "Virtual Lab Ironmaking". Se desarrollan y presentan tecnologías avanzadas de educación, como los Laboratorios Virtuales, para suministrar a los clientes de las instituciones de educación superior, investigación e industria, en apoyo de su trabajo, nuevos y eficientes métodos de operación y técnicas especiales de adiestramiento. Se ha desarrollado el Modelo Visual de "Horno Alto" basado en un modelo matemático del balance del proceso del horno alto, para fines de educación a distancia. Procesa los parámetros de entrada y salida en operación y los resultados de la ense anza. El modelo también simula la fabricación de sinter y pelets, además de la operación de las estufas. El profesor y alumnos pueden interactuar entre sí usando un software que permite seguir la marcha de la actividad de los alumnos, responder a sus preguntas y analizar los resultados del aprendizaje. El modelo es parte del "Laboratorio Virtual de Fabricación de Arrabio".
Coke, char and organic waste behaviour in the blast furnace with high injection rate
Gudenau, H. W.,Senk, D.,Fukada, K.,Babich, A.
Revista de Metalurgia , 2003,
Abstract: Blast furnace operation with low coke rate, high amount of auxiliary hydrocarbons and use of nut coke causes a change in coke quality requirements. In particular, not burned in the raceway residues of injected substances (char and ash) can influence the coke behaviour. Therefore combustion efficiency of various organic wastes with and without pulverized coal injection (PCI) and coal char has been investigated under the raceway simulation conditions. Mixing of various substances improves their combustion efficiency. Study on coke gasification by carbon dioxide in the presence of char showed that with the increase of char concentration, coke strength reduction becomes smaller. The reactivity of char with CO2 is higher than that of coke. Therefore char is consumed preferentially. In presence of injected char, total pore volume in coke and its wear resistance were increased. Coke reactivity and microstructure in the presence of various kinds of ash has been studied. Many ash spheres were observed on the surface of coke matrix and its size was dependent on ash properties. La operación del horno alto con una tasa baja de coque, una cantidad elevada de hidrocarburos auxiliares y el empleo de coque calibrado, origina un cambio en las necesidades de calidad del coque. En particular, pueden influir en el comportamiento del coque los residuos inquemados en el raceway (cavidad enfrente a las toberas del horno) de las sustancias que se inyectan (char y cenizas). El char es el residuo de carbón que se origina después que el carbón libera sus sustancias volátiles. Por tanto, se ha investigado la eficiencia de la combustión de varios residuos orgánicos con y sin inyección de carbón pulverizado (ICP) y char, bajo las condiciones de simulación del raceway. La mezcla de varias sustancias mejora la eficiencia a la combustión. El estudio de la gasificación del coque por el dióxido de carbono en la presencia de char, muestra que con el aumento de la concentración del char, la resistencia del coque después de la reducción se hace más peque a. La reactividad del char con el CO2 es más elevada que con la del coque. Por tanto, el char se consume con preferencia. En presencia del char inyectado aumentan el volumen total de poros del coque y la resistencia al desgaste. Se ha estudiado la reactividad y microestructura del coque con la presencia de distintos tipos de cenizas. Se observaron muchas esferas de ceniza sobre la superficie matriz del coque y el tama o de las esferas depende de la naturaleza de las cenizas.
Pre-Extraditionary Supervisory Probation as the Newest Rule of Law Observance Mechanism while Deciding on the Issuing a Person (Extradition)
Serhii Babich
NaUKMA Research Papers. Law , DOI: 10.18523/2617-2607.2018.1.93-98
Abstract: Modernization of the norms of criminal and procedural law is extremely important for the smooth functions of all state authorities, ensuring an adequate level of legal protection of the society and prospects of international cooperation. Trends in their constant changes cause the need to update certain institutions of criminal procedural law; in particular, the institution of issuing a person (extradition) to the principle of priority of the man’s and citizen’s rights and freedoms. A possible innovation of the institution of issuing a person (extradition) is the reform of precautionary measures that can be applied, in particular, by adding the pre-extraditionary supervisory probation to them. The main objective of the proposal is to introduce more humanized preventive measures that will create a legal framework to ensure the priority of the rights of foreign citizens in the application of preventive measures against them. The most important advantage of the pre-extraditionary supervisory probation is that instead of arrest, a suspect is sent not to an inquisitorial isolator but to a temporary detention isolator, re-equipped in accordance with European human rights standards. A person will go through a course of social correction there, accompanied by a correction of his/her behavior or its partitive manifestations. In case of the application of a precautionary measure not related to imprisonment, the staff of the authorized probation body will provide the proper procedure of re-education in the usual conditions for the person. Therefore, the use of this precautionary measure in preparation for issuing a person (extradition) will enable the potential offenders to remain socially adapted individuals, minimizing the occurrence of cases of mental and physical health disorders among them, and will ensure a more intensive realization of the social function of the state.
Choice of technological regimes of a blast furnace operation with injection of hot reducing gases
Babich, A. I.,Gudenau, H. W.,Mavrommatis, K. T.,Froehling, C.
Revista de Metalurgia , 2002,
Abstract: Injection rate of fossil fuels is limited because of drop in the flame temperature in the raceway and problems in the deadman region and the cohesive zone. The next step for obtaining a considerable coke saving, a better operation in the deadman as an well as increase in blast furnace productivity and minimizing the environmental impact due to a decrease in carbon dioxide emmision would be injection by tuyeres of hot reducing gases (HRG) which are produced by low grade coal gasification or top gas regenerating. Use of HRG in combination with high pulverized coal inyection PCI rate and oxigen enrichment in the blast could allow to keep and to increase the competitiveness of the blast furnace process. Calculations using a mathematical model show that the HRG injection in combination with pulverized coal (PC) and enriching blast with oxigen can provide an increase in PC rate up to 300-400 kg/tHM and a rise in the furnace productivity by 40-50 %. Blast furnace operation with full oxigen blast (100 % of process oxigen with the exception for the hot blast) is possible when HRG is injected. La tasa de inyección de combustibles fósiles está limitada a causa de la caída de la temperatura de llama en el raceway (cavidad frente a las toberas) y a problemas en la región del "hombre muerto" y en la zona cohesiva. La inyección por tobera de gases reductores calientes (GRC), que se producen por gasificación de carbón de bajo grado o generación de gas de tragante, será la próxima etapa para lograr un considerable ahorro adicional de coque, una zona del "hombre muerto" bien definida, además de un aumento en la productividad del horno alto y para minimizar el impacto ambiental debido a una disminución de la emisión de dióxido de carbono. El uso de GRC en combinación con una tasa elevada de inyección de carbón pulverizado (ICP) con viento enriquecido en oxígeno, podrá permitir mantener y aumentar la competitividad del proceso del horno alto. Los cálculos, utilizando un modelo matemático, muestran que la inyección de GRC en combinación con la ICP y enriquecimiento del viento con oxígeno pueden suministrar un aumento en la tasa de carbón pulverizado hasta 300-400 kg/t arrabio y una elevación en la productividad del horno de 40-50 %. La operación del horno alto con un máximo de oxígeno en el viento (100 % del oxígeno del proceso con la excepción para el viento caliente) es posible cuando se inyecta GRC.
Solving Lattice QCD systems of equations using mixed precision solvers on GPUs
M. A. Clark,R. Babich,K. Barros,R. C. Brower,C. Rebbi
Physics , 2009, DOI: 10.1016/j.cpc.2010.05.002
Abstract: Modern graphics hardware is designed for highly parallel numerical tasks and promises significant cost and performance benefits for many scientific applications. One such application is lattice quantum chromodyamics (lattice QCD), where the main computational challenge is to efficiently solve the discretized Dirac equation in the presence of an SU(3) gauge field. Using NVIDIA's CUDA platform we have implemented a Wilson-Dirac sparse matrix-vector product that performs at up to 40 Gflops, 135 Gflops and 212 Gflops for double, single and half precision respectively on NVIDIA's GeForce GTX 280 GPU. We have developed a new mixed precision approach for Krylov solvers using reliable updates which allows for full double precision accuracy while using only single or half precision arithmetic for the bulk of the computation. The resulting BiCGstab and CG solvers run in excess of 100 Gflops and, in terms of iterations until convergence, perform better than the usual defect-correction approach for mixed precision.
Search for New Physics Effects at a Linear Collider with Polarized Beams
A. Pankov,A. Babich
Physics , 2001,
Abstract: The four-fermion contact-interaction searches in the process $e^+e^-\to\mu^+\mu^-$ at a future $e^+e^-$ Linear Collider with c.m. energy $\sqrt{s}=0.5$ TeV and with both beams longitudinally polarized are studied. We evaluate the corresponding model-independent constraints on the coupling constants, emphasizing the role of beam polarization, and make a comparison with the case of Bhabha scattering.
About coordinates on the phase-spaces of Schlesinger system ($n+1$ matrices, $sl(2,C)$-case) and Garnier--Painlevé 6 system
Mikhail V. Babich
Mathematics , 2006,
Abstract: The geometric model of the pathway linking Schlesinger and Garnier--Painlev\'e~6 systems based on an original orthonormalization of a set of elements in ${sl(2,\mathbb C)}$ is constructed. The explicit polynomial map of the Cartesian products of $n-2$ quadrics (the Zariski-topology chart of the phase space of the Garnier--Painlev\'e~6 system) into the phase space of the Schlesinger system and the rational inverse to this map are presented.
Rational version of Archimedes symplectomorphysm and birational Darboux coordinates on coadjoint orbit of $GL(N,C)$
Mikhail V. Babich
Mathematics , 2010,
Abstract: A set of all linear transformations with a fixed Jordan structure $J$ is a symplectic manifold isomorphic to the coadjoint orbit $\mathcal O (J)$ of $GL(N,C)$. Any linear transformation may be projected along its eigenspace to (at least one) coordinate subspace of the complement dimension. The Jordan structure $\tilde J$ of the image is defined by the Jordan structure $J$ of the pre-image, consequently the projection $\mathcal O (J)\to \mathcal O (\tilde J)$ is the mapping of the symplectic manifolds. It is proved that the fiber $\mathcal E$ of the projection is a linear symplectic space and the map $\mathcal O(J) \to \mathcal E \times \mathcal O (\tilde J)$ is a birational symplectomorphysm. The iteration of the procedure gives the isomorphism between $\mathcal O (J)$ and the linear symplectic space, which is the direct product of all the fibers of the projections. The Darboux coordinates on $\mathcal O(J)$ are pull-backs of the canonical coordinates on the linear spaces in question.
Rational symplectic coordinates on the space of Fuchs equations $m \times m$-case
M. V. Babich
Mathematics , 2008, DOI: 10.1007/s11005-008-0274-3
Abstract: A method of constructing of Darboux coordinates on a space that is a symplectic reduction with respect to a diagonal action of $GL(m})$ on a Cartesian product of $N$ orbits of coadjoint representation of $GL(m)$ is presented. The method gives an explicit symplectic birational isomorphism between the reduced space on the one hand and a Cartesian product of $N-3$ coadjoint orbits of dimension $m(m-1)$ on an orbit of dimension $(m-1)(m-2)$ on the other hand. In a generic case of the diagonalizable matrices it gives just the isomorphism that is birational and symplectic between some open, in a Zariski topology, domain of the reduced space and the Cartesian product of the orbits in question. The method is based on a Gauss decomposition of a matrix on a product of upper-triangular, lower-triangular and diagonal matrices. It works uniformly for the orbits formed by diagonalizable or not-diagonalizable matrices. It is elaborated for the orbits of maximal dimension that is $m(m-1)$.
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