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Search Results: 1 - 10 of 1474 matches for " Drami?anin Miroslav "
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Structural and magnetic properties of mechanochemically synthesized nanocrystalline titanium monoxide
Barud?ija Tanja,Gusev Alexey A.,Jugovi? Dragana,Dramianin Miroslav
Hemijska Industrija , 2012, DOI: 10.2298/hemind111027090b
Abstract: Nano-sized titanium monoxide (TiO) powder was prepared by mechanochemical synthesis. A mixture of commercial Ti and TiO2 (rutile) powders with the molar ratio of 1:1 was milled in a planetary ball mill for 5, 10, 20, 30 and 60 min under argon atmosphere. The final single-phase titanium monoxide sample was characterized by X-ray diffraction (XRD), magnetic measurements using a superconducting quantum interference device magnetometer (SQUID) and thermogravimetric analysis (TGA). The temperature dependency of the magnetic susceptibility is characterized by significant contribution of Pauli paramagnetism due to conduction electrons.
The Practical Design of In-vehicle Telematics Device with GPS and MEMS Accelerometers
M. B. Vukajlovi?,S. Tadi?,D. M. Dramianin
Telfor Journal , 2012,
Abstract: The latest generation of vehicle tracking devices relies not only on Global Positioning System (GPS) but also uses low-cost Micro-Electro-Mechanical Systems (MEMS) accelerometers. This combination supports new services such as driving style characterization and Automatic Crash Notification (ACN). Our focus will be on practical considerations of such a telematics unit. The paper will consider the boundaries of allowed errors and minimal requirements for sensors and mounting requirements. Sensor range for crash detection and impact angle estimation was tested on field trials with two units containing accelerometers range of 18g and 2g. The kinematic orientation of vehicle is evaluated in a series of field trials with a resulting standard deviation of estimation of 1.67°. The second run of experiments considers the dynamic range and sampling rate of sensors during collision. A sensor range of 8g (typical for present-day telematics devices) can be used to detect crash without accurate knowledge of impact angle.
FPGA-based prototyping of IEEE 802.11a base band processor
Dramianin Dejan M.,Raki? Dejan,Deni? Slobodan,Vlahovi? Veljko
Serbian Journal of Electrical Engineering , 2004, DOI: 10.2298/sjee0403125d
Abstract: In technical literature and especially in domestic, predominant way to examine performance of 802.11a-based systems are experiments in simulations. In this paper, we present FPGA based 802.11a prototype, which gave us a possibility to gain closer insight into the problems of OFDM system implementation. A specific design of base band modem physical layer is discussed, along with the presentation of the FPGA prototyping platform on which it was developed. Prototype is implemented on the latest generation of FPGA chips, using state-of-the-art tools for DSP development. Custom made development environment, and design flow optimized for rapid prototyping of software defined radios, are also presented in the paper.
Computational Studies of Reaction-Diffusion Systems by Nonlinear Galerkin Method  [PDF]
Miroslav Kolá?
American Journal of Computational Mathematics (AJCM) , 2013, DOI: 10.4236/ajcm.2013.32022
Abstract:

This article deals with the computational study of the nonlinear Galerkin method, which is the extension of commonly known Faedo-Galerkin method. The weak formulation of the method is derived and applied to the particular Scott-Wang-Showalter reaction-diffusion model concerning the problem of combustion of hydrocarbon gases. The proof of convergence of the method based on the method of compactness is introduced. Presented results of numerical simulations are composed of the computational study, where the nonlinear Galerkin method and Faedo-Galerkin method are compared for the problem with analytical solution and the numerical results of the Scott-Wang-Showalter model in 1D.

OJAPr Editorial  [PDF]
Miroslav Joler
Open Journal of Antennas and Propagation (OJAPr) , 2013, DOI: 10.4236/ojapr.2013.11001
Abstract: Open Journal of Antennas and Propagation Editorial
Energy Shift of H-Atom Electrons Due to Gibbons-Hawking Thermal Bath  [PDF]
Miroslav Pardy
Journal of High Energy Physics, Gravitation and Cosmology (JHEPGC) , 2016, DOI: 10.4236/jhepgc.2016.24041
Abstract: The electromagnetic shift of energy levels of H-atom electrons is determined by calculating an electron coupling to the Gibbons-Hawking ectromagnetic field thermal bath. Energy shift of electrons in H-atom is determined in the framework of non-relativistic quantum mechanics.
Finite dimensional factor algebras of F2[X1, …, Xn] and their fixed point subalgebras  [PDF]
Miroslav Kure?
Open Journal of Applied Sciences (OJAppS) , 2012, DOI: 10.4236/ojapps.2012.24B048
Abstract: Fixed point subalgebras of finite dimensional factor algebras of algebras of polynomials in n indeterminates over the finite field F2 (with respect to all F2-algebra automorphisms) are fully described.
Thomas Precession by Uniform Acceleration and Gravity  [PDF]
Miroslav Pardy
Journal of High Energy Physics, Gravitation and Cosmology (JHEPGC) , 2018, DOI: 10.4236/jhepgc.2018.41012
Abstract: We determine nonlinear transformations between coordinate systems which are mutually in a constant symmetrical accelerated motion. The maximal acceleration limit follows from the kinematical origin and it is an analogue of the maximal velocity in special relativity. We derive the dependence of mass, length, time, Doppler effect, Cerenkov effect and transition radiation angle on acceleration as an analogue phenomenon in special theory of relativity. The last application of our method is the Thomas precession by uniform acceleration and equivalent gravity with the possible role in modern physics and cosmology.
A Rough Set-Based Model of HIV-1 Reverse Transcriptase Resistome
Marcin Kierczak,Krzysztof Ginalski,Micha? Dramiński,Jacek Koronacki
Bioinformatics and Biology Insights , 2009,
Abstract: Reverse transcriptase (RT) is a viral enzyme crucial for HIV-1 replication. Currently, 12 drugs are targeted against the RT. The low fidelity of the RT-mediated transcription leads to the quick accumulation of drug-resistance mutations. The sequence-resistance relationship remains only partially understood. Using publicly available data collected from over 15 years of HIV proteome research, we have created a general and predictive rule-based model of HIV-1 resistance to eight RT inhibitors. Our rough set-based model considers changes in the physicochemical properties of a mutated sequence as compared to the wild-type strain. Thanks to the application of the Monte Carlo feature selection method, the model takes into account only the properties that significantly contribute to the resistance phenomenon. The obtained results show that drug-resistance is determined in more complex way than believed. We confirmed the importance of many resistance-associated sites, found some sites to be less relevant than formerly postulated and— more importantly—identified several previously neglected sites as potentially relevant. By mapping some of the newly discovered sites on the 3D structure of the RT, we were able to suggest possible molecular-mechanisms of drug-resistance. Importantly, our model has the ability to generalize predictions to the previously unseen cases. The study is an example of how computational biology methods can increase our understanding of the HIV-1 resistome.
Nonabelian Dualization of Plane Wave Backgrounds  [PDF]
Ladislav Hlavaty, Miroslav Turek
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.39143
Abstract: We investigate plane-parallel wave metrics from the point of view of their (Poisson-Lie) T-dualizability. For that purpose we reconstruct the metrics as backgrounds of nonlinear sigma models on Lie groups. For construction of dual backgrounds we use Drinfel’d doubles obtained from the isometry groups of the metrics. We find dilaton fields that enable to satisfy the vanishing beta equations for the duals of the homogenous plane-parallel wave metric. Torsion potentials or B-fields, invariant w.r.t. the isometry group of Lobachevski plane waves are obtained by the Drinfel’d double construction. We show that a certain kind of plurality, different from the (atomic) Poisson-Lie T-plurality, may exist in case that metrics admit several isometry subgroups having the dimension of the Riemannian manifold. An example of that are two different backgrounds dual to the homogenous plane-parallel wave metric.
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