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Search Results: 1 - 10 of 223813 matches for " R. Avetisyan "
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Interrelation of Languages of Colored Petri Nets and Some Traditional Languages  [PDF]
Goharik R. Petrosyan, Andrey M. Avetisyan, Lilit A. Ter-Vardanyan
Open Journal of Modelling and Simulation (OJMSi) , 2013, DOI: 10.4236/ojmsi.2013.13005
Abstract: The article studies the interrelation of Languages of Colored Petri Nets and Traditional formal languages. The author constructed the graph of Colored Petri Net, which generates L* Context-free language. This language may not be modeled using standard Petri Nets [1]. The Venn graph and diagram that the author modified [1], show the interrelation between languages of Colored Petri Nets and some Traditional languages. Thus the class of languages of Colored Petri Nets is supposed to include an entire class of Context-free languages.
Changes in the Nuclei of Infected Cells at Early Stages of Infection with EMCV  [PDF]
Zaven A. Karalyan, Hranush R. Avagyan, Hovakim S. Zakaryan, Liana O. Abroyan, Lina H. Hakobyan, Aida S. Avetisyan, Elena M. Karalova
CellBio (CellBio) , 2013, DOI: 10.4236/cellbio.2013.23014
Abstract:

By the methods of quantitative cytophotometry, we have identified the changes in the nucleus and of some intranuclear compartments in the early stages of infection with encephalomyocarditis virus (EMCV). They can be characterized as early 1 - 2 hours post infection (hpi) and temporary increase (duration about 1 hour) in the content of the acidic proteins of the nucleolus, changing their decline to the control values. Then (after 1 - 2 hours) follows an increase in RNA content of nucleoli to 4 hours post infection (the process takes about 2 hours). The increase in RNA content in nucleoli is in approximately the same time (slightly behind) with the activation of PML bodies (2 - 4 hpi). Then, the RNA content in nucleoli decreased to the control values, while simultaneously decreasing activity of PML bodies (ranging from 5 - 6 hpi). The early stages of infection EMCV are also characterized by the tendency to increase in the size of the nuclei of infected cells, and preserve at a later time. Then there is an increase in RNA content in the nucleus, roughly coinciding with the increased content of RNA in the nucleoli.

Search for top partners with charge 5e/3
Aram Avetisyan,Tulika Bose
Physics , 2013,
Abstract: A feasibility study of searches for top partners with charge 5e/3 at the upgraded Large Hadron Collider is performed. The discovery potential and exclusion limits are presented using integrated luminosities of 300 fb$^{-1}$ and 3000 fb$^{-1}$ at center-of-mass energies of 14 and 33 TeV.
Explicit harmonic and spectral analysis in Bianchi I-VII type cosmologies
Zhirayr Avetisyan,Rainer Verch
Physics , 2012, DOI: 10.1088/0264-9381/30/15/155006
Abstract: The solvable Bianchi I-VII groups which arise as homogeneity groups in cosmological models are analyzed in a uniform manner. The dual spaces (the equivalence classes of unitary irreducible representations) of these groups are computed explicitly. It is shown how parameterizations of the dual spaces can be chosen to obtain explicit Plancherel formulas. The Laplace operator $\Delta$ arising from an arbitrary left invariant Riemannian metric on the group is considered, and its spectrum and eigenfunctions are given explicitly in terms of that metric. The spectral Fourier transform is given by means of the eigenfunction expansion of $\Delta$. The adjoint action of the group automorphisms on the dual spaces is considered. It is shown that Bianchi I-VII type cosmological spacetimes are well suited for mode decomposition. The example of the mode decomposed Klein-Gordon field on these spacetimes is demonstrated as an application.
A unified mode decomposition method for physical fields in homogeneous cosmology
Zhirayr G. Avetisyan
Physics , 2012,
Abstract: The methods of mode decomposition and Fourier analysis of classical and quantum fields on curved spacetimes previously available mainly for the scalar field on Friedman- Robertson-Walker (FRW) spacetimes are extended to arbitrary vector bundle fields on general spatially homogeneous spacetimes. This is done by developing a rigorous unified framework which incorporates mode decomposition, harmonic analysis and Fourier anal- ysis. The limits of applicability and uniqueness of mode decomposition by separation of the time variable in the field equation are found. It is shown how mode decomposition can be naturally extended to weak solutions of the field equation under some analytical assumptions. It is further shown that these assumptions can always be fulfilled if the vector bundle under consideration is analytic. The propagator of the field equation is explicitly mode decomposed. A short survey on the geometry of the models considered in mathematical cosmology is given and it is concluded that practically all of them can be represented by a semidirect homogeneous vector bundle. Abstract harmonic analytical Fourier transform is introduced in semidirect homogeneous spaces and it is explained how it can be related to the spectral Fourier transform. The general form of invariant bi-distributions on semidirect homogeneous spaces is found in the Fourier space which generalizes earlier results for the homogeneous states of the scalar field on FRW spacetimes.
Beam-Spin Azimuthal Asymmetries in Pion Electroproduction at HERMES
HERMES Collaboration,E. Avetisyan
Physics , 2004,
Abstract: We present the measurement of Single Beam-Spin Azimuthal Asymmetries in pion electroproduction off hydrogen in semi-inclusive deep inelastic scattering (SIDIS). The measurement was made using the HERMES spectrometer with an internal gas target and the polarized 27.6 GeV electron(positron) beam of HERA using the data taken during the years 1996-2000. The $\sin\phi$ modulation of the azimuthal asymmetry was measured for semi-inclusive $\pi^+,\pi^-$ and $\pi^0$. The dependence of the asymmetry on the Bjorken $x$, pion relative ($z$) and transverse ($P_T$) momentum is presented. Results are compared to theoretical model calculation.
Random Irregular Block-hierarchical Networks: Algorithms for Computation of Main Properties
Mikayel Samvelyan,Svetlana Avetisyan
Computer Science , 2015,
Abstract: In this paper, the class of random irregular block-hierarchical networks is considered and defined and algorithms for generation and computation of network properties are described. The algorithms presented for this class of networks are more efficient than known algorithms both in computation time and memory usage and may be used to analyze topological properties of random irregular block-hierarchical networks. The algorithms are implemented in the system created by the authors for the study of topological properties of random networks.
Realism and Modern Characters in Chekhov s Works
Ali Reza Bonyadi,Zaven Avetisyan
The Social Sciences , 2013, DOI: 10.3923/sscience.2012.242.245
Abstract: Unlike previous authors such as Gogol and Tolstoy, Chekhov is recognized as a different realist who has violated the heroic tradition of husbandry and he has created a new style on fictional and dramatic characters in humour themes. In fact, all the characters from his masterpieces are basic and important those are not nobleman and ideal hero but are ordinary people. As the matter of fact, Chekhovby inventing a new method did not feature all the weaknesses in a certain character but he has shared all the people in their destinies and undoubtedly, the modern writing has begun by this created new style.
The quality of care for adults with epilepsy: an initial glimpse using the QUIET measure
Mary Pugh, Dan R Berlowitz, Jaya K Rao, Gabriel Shapiro, Ruzan Avetisyan, Amresh Hanchate, Kelli Jarrett, Jeffrey Tabares, Lewis E Kazis
BMC Health Services Research , 2011, DOI: 10.1186/1472-6963-11-1
Abstract: We identified 311 individuals with epilepsy diagnosis between 2004 and 2007 in a tertiary medical center in New England. We abstracted medical charts to identify the extent to which participants received quality indicator (QI) concordant care for individual QI's and the proportion of recommended care processes completed for different aspects of epilepsy care over a two year period. Finally, we compared the proportion of recommended care processes completed for those receiving care only in primary care, neurology clinics, or care shared between primary care and neurology providers.The mean proportion of concordant care by indicator was 55.6 (standard deviation = 31.5). Of the 1985 possible care processes, 877 (44.2%) were performed; care specific to women had the lowest concordance (37% vs. 42% [first seizure evaluation], 44% [initial epilepsy treatment], 45% [chronic care]). Individuals receiving shared care had more aspects of QI concordant care performed than did those receiving neurology care for initial treatment (53% vs. 43%; X2 = 9.0; p = 0.01) and chronic epilepsy care (55% vs. 42%; X2 = 30.2; p < 0.001).Similar to most other chronic diseases, less than half of recommended care processes were performed. Further investigation is needed to understand whether a shared-care model enhances quality of care, and if so, how it leads to improvements in quality.While existing quality indicators have focused on a number of highly prevalent chronic conditions (e.g., diabetes, hypertension) they do not address the quality of care for less prevalent, but serious conditions, such as epilepsy. Epilepsy care presents complexity in the sense that providers must balance seizure control, adverse drug effects, and complicated issues associated with epilepsy itself (e.g. mood disorders [1-3]) while also being mindful of consequences related to long-term treatment with antiepileptic drugs (e.g. bone health [4-6]). Thus, it is important to begin examining the quality of care provide
The Time-of-Flight Technique for the HERMES Experiment
HERMES Collaboration,A. Airapetian,N. Akopov,M. Amarian,H. Avakian,A. Avetissian,E. Avetisyan,B. W. Filippone,R. Kaiser,H. Zohrabian
Physics , 2003, DOI: 10.1016/j.nima.2004.11.028
Abstract: This paper describes the use of the time-of-flight (TOF) technique as a particle identification method for the HERMES experiment. The time-of-flight is measured by two 1x4 m^2 scintillation hodoscopes that initially were designed for the first-level trigger only. However, the suitable time structure of the HERA electron beam allows an extension of their functions to also measure the TOF for low momentum hadron identification. Using only these conventional hodoscopes, good particle identification was achieved for protons and pions in the momentum range up to 2.9GeV/c and for kaons up to 1.5GeV/c.
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