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The High Redshift Blazar S5 0836+71: A Broadband StudyFeb 25 2015A broadband study of the high redshift blazar S5 0836+71 (z = 2.172) is presented. Multi-frequency light curves show multiple episodes of X-ray and $\gamma$-ray flares, while optical-UV fluxes show little variations. During the GeV outburst, the highest ... More

Fermi-Large Area Telescope Observations of the Exceptional Gamma-ray Flare from 3C 279 in 2015 JuneJul 11 2015An exceptional $\gamma$-ray outburst from 3C 279 is detected by {\it Fermi}-Large Area Telescope (LAT) in 2015 June. In the energy range of 0.1$-$300 GeV, the highest flux measured is (39.1$\pm$2.5) $\times$ 10$^{-6}$ \phflux, which is the highest $\gamma$-ray ... More

The First GeV Outburst of the Radio-loud Narrow Line Seyfert 1 galaxy PKS 1502+036Mar 04 2016The $\gamma$-ray loud narrow line Seyfert 1 ($\gamma$-NLSy1) galaxy PKS 1502+036 ($z=0.409$) exhibited its first $\gamma$-ray outburst on 2015 December 20. In the energy range of 0.1-300 GeV, the highest flux measured by {\it Fermi}-Large Area Telescope ... More

Fermi Monitoring of Radio-loud Narrow Line Seyfert 1 GalaxiesOct 03 2014We present detailed analysis of the gamma-ray flux variability and spectral properties of the five radio-loud narrow line Seyfert 1 (RL-NLSy1) galaxies, detected by the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope, namely 1H 0323+342, ... More

Intra-Night Optical Variability Monitoring of Fermi Blazars: First Results from 1.3 m J C Bhattacharya TelescopeDec 27 2018We report the first results obtained from our campaign to characterize the intranight-optical variability (INOV) properties of {\it Fermi}~detected blazars, using the observations from the recently commissioned 1.3 m J C Bhattacharya telescope (JCBT). ... More

Supermassive black holes at high redshiftsMar 14 2019MeV blazars are the most luminous persistent sources in the Universe and emit most of their energy in the MeV band. These objects display very large jet powers and accretion luminosities and are known to host black holes with a mass often exceeding $10^9 ... More

Multi-wavelength observations of 3C 279 during the extremely bright gamma-ray flare in 2014 March-AprilJan 29 2015The well studied blazar 3C 279 underwent a giant $\gamma$-ray outburst in 2014 March-April. The measured $\gamma$-ray flux (1.21 $\pm$ 0.10 $\times$ 10$^{-5}$ ph cm$^{-2}$ s$^{-1}$ in 0.1-300 GeV energy range) is the highest detected from 3C 279 by Fermi ... More

The Nature of gamma-ray Loud Narrow Line Seyfert I Galaxies PKS 1502+036 and PKS 2004-447Mar 14 2013Variable gamma-ray emission has been discovered in five Radio-loud Narrow Line Seyfert 1 (NLSy1) galaxies by the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope. This has clearly demonstrated that these NLSy1 galaxies do have relativistic ... More

Broadband Observations of the Gamma-ray Emitting Narrow Line Seyfert 1 Galaxy SBS 0846+513Mar 04 2016We present the results of our broadband study of the $\gamma$-ray emitting narrow line Seyfert 1 (NLSy1) galaxy SBS 0846+513 ($z=0.585$). This includes multi-band flux variations, $\gamma$-ray spectral analysis, broad band spectral energy distribution ... More

Gamma-ray Emitting Narrow Line Seyfert 1 Galaxies in The Sloan Digital Sky SurveyJan 05 2018The detection of significant $\gamma$-ray emission from radio-loud narrow line Seyfert 1 (NLSy1s) galaxies enables us to study jets in environments different than those in blazars. However, due to the small number of known $\gamma$-ray emitting NLSy1 ... More

Violent Hard X-ray Variability of Mrk 421 Observed by NuSTAR in 2013 AprilAug 26 2015The well studied blazar Markarian 421 (Mrk 421, $z$=0.031) was the subject of an intensive multi-wavelength campaign when it flared in 2013 April. The recorded X-ray and very high energy (VHE, E$>$100 GeV) $\gamma$-ray fluxes are the highest ever measured ... More

Lepto$-$Hadronic Origin of $γ$-ray Outbursts of 3C 279Mar 04 2016The blazar 3C 279 exhibited a giant $\gamma$-ray outburst in 2013 December and 2014 April. Apart from the very fast $\gamma$-ray flux variability, the spectral nature of the flares were also found to vary significantly between these two flaring events. ... More

A hard gamma-ray flare from 3C 279 in 2013 DecemberDec 01 2015The blazar 3C 279 exhibited twin $\gamma$-ray flares of similar intensity in 2013 December and 2014 April. In this work, we present a detailed multi-wavelength analysis of the 2013 December flaring event. Multi-frequency observations reveal the uncorrelated ... More

Broadband Observations of High Redshift BlazarsApr 28 2016We present a multi-wavelength study of four high redshift blazars, S5 0014+81 ($z=3.37$), CGRaBS J0225+1846 ($z=2.69$), BZQ J1430+4205 ($z=4.72$), and 3FGL J1656.2$-$3303 ($z=2.40$), using the quasi-simultaneous data from {\it Swift}, {\it NuSTAR}, and ... More

General Physical Properties of CGRaBS BlazarsNov 03 2017Nov 07 2017We present the results of a multi-frequency, time-averaged analysis of blazars included in the Candidate Gamma-ray Blazar Survey catalog. Our sample consists of 324 $\gamma$-ray detected ($\gamma$-ray loud) and 191 non $\gamma$-ray detected ($\gamma$-ray ... More

Intranight optical variability of γ-ray loud Narrow Line Seyfert 1 galaxiesOct 16 2012The Large Area Telescope (LAT) onboard the {\it Fermi} Gamma Ray Space Telescope has detected \gamma-ray emission from some Narrow Line Seyfert 1(NLSy1) galaxies. This indicates the presence of relativistic jets in these sources similar to blazars and ... More

New high-z BL Lacs using the photometric method with Swift and SARASep 11 2017Apr 11 2018BL Lacertae (BL Lac) objects are the prominent members of the third {\it Fermi} Large Area Telescope catalog of $\gamma$-ray sources. Half of the BL Lac population ($\sim$ 300) lack redshift measurements, which is due to the absence of lines in their ... More

The Peculiar Radio-Loud Narrow Line Seyfert 1 Galaxy 1H 0323+342May 04 2014We present a multi-wavelength study of the radio-loud narrow line Seyfert 1 galaxy (NLSy1), 1H 0323+342, detected by Fermi Gamma Ray Space Telescope. Multi-band light curves show many orphan X-ray and optical flares having no corresponding {\gamma}-ray ... More

Leptonic and Hadronic Modeling of Fermi-LAT Hard Spectrum Quasars and Predictions for High-Energy PolarizationJul 05 2018We present the results of a study of the time-averaged spectral energy distributions (SEDs) of eight flat spectrum radio quasars (FSRQs) present in the second catalog of high energy sources detected beyond 50 GeV by the {\it Fermi}-Large Area Telescope ... More

General Physical Properties of Gamma-ray Emitting Narrow-Line Seyfert 1 GalaxiesJan 22 2019We present the results of a detailed multi-wavelength study of a sample of sixteen narrow-line Seyfert 1 (NLSy1) galaxies known in $\gamma$-rays so far. This includes a focused X-ray spectral analysis, to compare them with a more general NLSy1 population, ... More

Awakening of The High Redshift Blazar CGRaBS J0809+5341Feb 19 2015CGRaBS J0809+5341, a high redshift blazar at z = 2.144, underwent a giant optical outburst on 2014 April 19 when it brightened by $\sim$5 mag and reached an unfiltered apparent magnitude of 15.7 mag. This implies an absolute magnitude of -30.5 mag, making ... More

Fuzzy Aided Application Layer Semantic Intrusion Detection System - FASIDSMay 25 2010The objective of this is to develop a Fuzzy aided Application layer Semantic Intrusion Detection System (FASIDS) which works in the application layer of the network stack. FASIDS consist of semantic IDS and Fuzzy based IDS. Rule based IDS looks for the ... More

A GeV-TeV Measurement of the Extragalactic Background LightMar 07 2019Mar 11 2019The Extragalactic Background Light (EBL) can be probed via the absorption imprint it leaves in the spectra of gamma-ray sources ($\gamma\gamma \rightarrow e^-e^+$). We recently developed a dedicated technique to reconstruct the EBL, and its evolution ... More

Detection of a gamma-ray flare from the high-redshift blazar DA 193Dec 18 2018High-redshift ($z>2$) blazars are the most powerful members of the blazar family. Yet, only a handful of them have both X-ray and $\gamma$-ray detection, thereby making it difficult to characterize the energetics of the most luminous jets. Here, we report, ... More

A GeV-TeV Measurement of the Extragalactic Background LightMar 07 2019The Extragalactic Background Light (EBL) can be probed via the absorption imprint it leaves in the spectra of gamma-ray sources ($\gamma\gamma \rightarrow e^-e^+$). We recently developed a dedicated technique to reconstruct the EBL, and its evolution ... More

Relaxation Control of Packet Arrival Rate in the Neighborhood of the Destination in Concentric Sensor NetworksJan 21 2010One of the challenges in the wireless sensor applications which are gaining much attention is the real-time transmission of continuous data packets across the network. Though advances in communication in sensor networks are providing guaranteed quality ... More

Factors Influencing Job Rejections in Cloud EnvironmentSep 28 2012The IT organizations invests heavy capital by consuming large scale infrastructure and advanced operating platforms. The advances in technology has resulted in emergence of cloud computing, which is promising technology to achieve the aforementioned objective. ... More

Enhanced Load Balancing Approach to Avoid Deadlocks in CloudSep 28 2012The state-of-art of the technology focuses on data processing to deal with massive amount of data. Cloud computing is an emerging technology, which enables one to accomplish the aforementioned objective, leading towards improved business performance. ... More

Probing the EBL evolution at high redshift using GRBs detected with the Fermi-LATOct 06 2017The extragalactic background light (EBL), from ultraviolet to infrared wavelengths, is predominantly due to emission from stars, accreting black holes and reprocessed light due to Galactic dust. The EBL can be studied through the imprint it leaves, via ... More

A new measurement of the Hubble constant and matter content of the Universe using extragalactic background light $γ$-ray attenuationMar 28 2019The Hubble constant $H_{0}$ and matter density $\Omega_{m}$ of the Universe are measured using the latest $\gamma$-ray attenuation results from {\it Fermi}-LAT and Cherenkov telescopes. This methodology is based upon the fact that the extragalactic background ... More

Severity Prediction of Drought in A Large Geographical Area Using Distributed Wireless Sensor NetworksJan 21 2010In this paper, the severity prediction of drought through the implementation of modern sensor networks is discussed. We describe how to design a drought prediction system using wireless sensor networks. This paper will describe a terrestrial interconnected ... More

New High-z Fermi BL Lacs with the Photometric Dropout TechniqueNov 11 2016Determining redshifts for BL Lacertae (BL Lac) objects using the traditional spectroscopic method is challenging due to the absence of strong emission lines in their optical spectra. We employ the photometric dropout technique to determine redshifts for ... More

Search for extended sources in the Galactic Plane using 6 years of Fermi-Large Area Telescope Pass 8 data above 10 GeVFeb 01 2017Apr 11 2018The spatial extension of a gamma-ray source is an essential ingredient to determine its spectral properties as well as its potential multi-wavelength counterpart. The capability to spatially resolve gamma-ray sources is greatly improved by the newly delivered ... More

High-redshift blazars through nustar eyesMar 30 2017The most powerful sources among the blazar family are MeV blazars. Often detected at $z>2$, they usually display high X- and \gm-ray luminosities, larger-than-average jet powers and black hole masses $\gtrsim 10^9 M_{\odot}$. In the present work we perform ... More

A Multicore Processor based Real-Time System for Automobile management applicationJan 21 2010In this paper we propose an Intelligent Management System which is capable of managing the automobile functions using the rigorous real-time principles and a multicore processor in order to realize higher efficiency and safety for the vehicle. It depicts ... More

Multicore Applications in Real Time SystemsJan 20 2010Microprocessor roadmaps clearly show a trend towards multiple core CPUs. Modern operating systems already make use of these CPU architectures by distributing tasks between processing cores thereby increasing system performance. This review article highlights ... More

Columbia MVSO Image Sentiment DatasetNov 14 2016The Multilingual Visual Sentiment Ontology (MVSO) consists of 15,600 concepts in 12 different languages that are strongly related to emotions and sentiments expressed in images. These concepts are defined in the form of Adjective-Noun Pair (ANP), which ... More

Cloud Computing For MicrofinancesApr 12 2012Evolution of Science and Engineering has led to the growth of several commercial applications. The wide spread implementation of commercial based applications has in turn directed the emergence of advanced technologies such as cloud computing. India has ... More

Detection of Possible Quasi-periodic Oscillations in the Long-term Optical Light Curve of the BL Lac Object OJ 287Sep 08 2016Detection of periodicity in the broad-band non-thermal emission of blazars has so far been proven to be elusive. However, there are a number of scenarios which could lead to quasi-periodic variations in blazar light curves. For example, orbital or thermal/viscous ... More

A Novel Agent Based Approach for Controlling Network StormsJul 11 2011One of the fundamental data transmission mechanisms in Ethernet LAN is broadcasting. Flooding is a direct broadcasting technique used in these networks. A significant drawback of this method is that it can lead to broadcast storms. This phenomenon is ... More

Improved Strategies for Enhanced Business Performance in Cloud based IT IndustriesJan 12 2012Jul 15 2012Emergence of sophisticated technologies in IT industries has posed several challenges such as production of products using advanced technical process for instance Result Orientation Approach, Deployment, Assessment and Refinement (RADAR) in a dynamic ... More

NuSTAR, Swift, and GROND observations of the flaring MeV blazar: PMN J0641$-$0320Feb 20 2016MeV blazars are a sub--population of the blazar family, exhibiting larger--than--average jet powers, accretion luminosities and black hole masses. Because of their extremely hard X--ray continua, these objects are best studied in the X-ray domain. Here, ... More

MAGIC and Fermi-LAT gamma-ray results on unassociated HAWC sourcesJan 13 2019The HAWC Collaboration released the 2HWC catalog of TeV sources, in which 19 show no association with any known high-energy (HE; E > 10 GeV) or very-high-energy (VHE; E > 300 GeV) sources. This catalog motivated follow-up studies by both the MAGIC and ... More

A $γ$-ray determination of the Universe's star-formation historyDec 03 2018The light emitted by all galaxies over the history of the Universe produces the extragalactic background light (EBL) at ultraviolet, optical, and infrared wavelengths. The EBL is a source of opacity for $\gamma$ rays via photon-photon interactions, leaving ... More

NNLO classical solution for Lipatov's effective action for reggeized gluonsFeb 15 2018Mar 19 2018We consider the formalism of small-x effective action for reggeized gluons, Gribov (Sov Phys JETP 26:414, 1968), Lipatov (Nucl Phys B 452:369, 1995; Phys Rep 286:131, 1997; Subnucl Ser 49:131, 2013, Int J Mod Phys Conf Ser 39:1560082, 2015; Int J Mod ... More

Ghost-Stochastic Resonance in a Unidirectionally Coupled and Small-World NetworksOct 27 2015Ghost-stochastic resonance is a noise-induced resonance at a missing fundamental frequency in the input signal. In this paper we investigate the features of ghost-stochastic resonance in a unidirectionally coupled network and small-world network with ... More

Signal amplification by unidirectional coupling of oscillatorsApr 22 2014We report our investigation on the input signal amplification in unidirectionally coupled monostable Duffing oscillators in one- and two-dimensions with first oscillator alone driven by a weak periodic signal. Applying a perturbation theory we obtain ... More

Complex molecular gas structure in the Medusa mergerAug 16 2000High resolution OVRO aperture synthesis maps of the 12CO 1-0 emission in the `Medusa' galaxy merger (NGC4194) reveal the molecular emission being surprisingly extended. It is distributed on a total scale of 25$''$ (4.7 kpc) - despite the apparent advanced ... More

Direct evidence of soft mode behavior near the Burns' temperature in PbMg$_{1 / 3}$Nb$_{2 / 3}$O$_{3}$ (PMN) relaxor ferroectricMar 05 2002Inelastic neutron scattering measurements of the relaxor ferroelectric PbMg$_{1 / 3}$Nb$_{2 / 3}$O$_{3}$ (PMN) in the temperature range 490~K$<$T$<$880~K directly observe the soft mode (SM) associated with the Curie-Weiss behavior of the dielectric constant ... More

Selected issues on justification of holographic approach to QCDApr 19 2010Some problems with theoretical foundations of bottom-up holographic models are briefly discussed. It is pointed out that the spectroscopic aspects of these models in principle do not require the AdS/CFT prescriptions and may be interpreted as just an ... More

Illustrative Model for Parity Doubling of Energy LevelsDec 27 2007A one-dimensional quantum mechanical model possessing mass gap, a gapless excitation, and an approximate parity doubling of energy levels is constructed basing on heuristic QCD-inspired arguments. The model may serve for illustrative purposes in considering ... More

Weinberg like sum rules revisitedOct 25 2007Oct 29 2007The generalized Weinberg sum rules containing the difference of isovector vector and axial-vector spectral functions saturated by both finite and infinite number of narrow resonances are considered. We summarize the status of these sum rules and analyze ... More

Cluster dualityJun 28 2006Apr 30 2007It is well known that the linear mass spectrum of light mesons in the large-N_c limit is dual to the perturbative QCD continuum. We find the form of the linear spectrum which is maximally dual to the perturbation theory. The obtained ansatz turns out ... More

Quark condensate and deviations from string-like behaviour of meson spectraSep 30 2003I analyse the hypothesis that deviations from the linear meson mass spectra appear due to the dynamical chiral symmetry breaking in QCD. It is shown that the linear mass spectrum for the light, non-strange vector and axial-vector mesons is then parametrized ... More

Note on description of excited hadrons with fixed angular momentumApr 06 2009In this Note, we make comments on the recent criticism of the description of highly excited hadrons in terms of fixed angular momentum L and quantify the relation M^2\sim L+n+S/2 (n is the radial quantum number and S is the total quark spin) for masses ... More

Calculation of the Cherenkov fields in the cross-section of a short relativistic bunchJul 14 2015Recently, a new method for calculating the Cherenkov field acting on a point-like electron bunch passing through longitudinally homogeneous structures lined with arbitrary slowdown layers was proposed, where the formalism was obtained though consideration ... More

Quotient Equations and Integrals of Motion for Scalar FieldMar 29 2003In this article a group-theoretical aspect of the method of dimensional reduction is presented. Then, on the base of symmetry analysis for an anisotropic space geometrical description of dimensional reduction of equation for scalar field is given. Formula ... More

Pair production by a circularly polarized electromagnetic wave in plasmaJul 23 2003Mar 15 2004We present the results of the calculation of the electron-positron pair creation probability by the circularly polarized electromagnetic wave during its propagation in underdense collisionless plasmas. The dependence of the probability on the frequency ... More

How much information can be obtained by a quantum measurement?Jul 21 1999How much information about an unknown quantum state can be obtained by a measurement? We propose a model independent answer: the information obtained is equal to the minimum entropy of the outputs of the measurement, where the minimum is taken over all ... More

Review and Analysis of Local Multipoint Distribution System (LMDS) to Deliver Voice, Data, Internet, and Video ServicesJan 23 2010Local multipoint distribution system (LMDS) uses cellular-like network architecture of microwave radios placed at the client's location and at the company's base station to deliver fixed services, mainly telephony, video and Internet access. The use of ... More

Unitarity and the scale of fermion mass generationJun 05 1998Jun 30 1998We study the upper bound on the scale of fermion mass generation in a two-Higgs-doublet model. If the model is weakly-coupled, the scale of fermion mass generation is much less than the Appelquist-Chanowitz unitarity bound. However, if we allow some dimensionless ... More

Young star clusters in external galaxiesJul 20 2011I review the characteristics of cluster populations in other galaxies, with particular emphasis on young star clusters and a comparison with the (known) open cluster population of the Milky Way. Young globular cluster-like (compact, massive) objects can ... More

Young Massive Star Clusters in Normal GalaxiesMar 10 2004Young star clusters with masses similar to those of classical old globular clusters are observed not only in starbursts, mergers or otherwise disturbed galaxies, but also in normal spiral galaxies. Some young clusters with masses as high as ~10^6 Msun ... More

Nonlocal spin Hall effect and spin-orbit interaction in nonmagnetic metalsSep 08 2006Spin Hall effect in a nonlocal spin-injection device is theoretically studied. Using a nonlocal spin-injection technique, a pure spin current is created in a nonmagnetic metal (N). The spin current flowing in N is deflected by spin-orbit scattering to ... More

An illustration of the light-front coupled-cluster method in quantum electrodynamicsAug 30 2012A field-theoretic formulation of the exponential-operator technique is applied to a nonperturbative Hamiltonian eigenvalue problem in electrodynamics, quantized in light-front coordinates. Specifically, we consider the dressed-electron state, without ... More

Non-Markovianity by Quantum LossJun 22 2014In the study of open quantum systems, information exchange between system and its surrounding environment plays an eminent and important role in analysing the dynamics of open quantum system. In this work, by making use of the quantum information theory ... More

The Batalin-Vilkovisky Formalism on Fermionic Kaehler ManifoldsMay 19 1993We show that the Kaehler structure can be naturally incorporated in the Batalin-Vilkovisky formalism. The phase space of the BV formalism becomes a fermionic Kaehler manifold. By introducing an isometry we explicitly construct the fermionic irreducible ... More

Symbiotic Miras vs. Planetary Nebulae in the Near InfraredAug 06 2002While symbiotic Miras and planetary nebulae are hard to distinguish by optical spectroscopy, their near infrared colors differ. We propose the near infrared two-color diagram to be an excellent tool to easily distinguish these two classes of objects.

Fundamental Physical Constants and the Principle of Parametric IncompletenessSep 07 1999The principle which allows to construct new physical theories on the basis of classical mechanics by reduction of the number of its axiom without engaging new postulates is formulated. The arising incompleteness of theory manifests itself in terms of ... More

Black holes may not constrain varying constantsSep 27 2002New and rather controversial observations hint that the fine structure constant \alpha may have been smaller in the early universe, suggesting that some of the fundamental ``constants'' of physics may be dynamical. In a recent paper, Davies, Davis, and ... More

Phase Transitions and Critical Behavior for Charged Black HolesJun 12 2003We investigate the thermodynamics of a four-dimensional charged black hole in a finite cavity in asymptotically flat and asymptotically de Sitter space. In each case, we find a Hawking-Page-like phase transition between a black hole and a thermal gas ... More

Signatures of polaronic charge ordering in optical and dc conductivity using dynamical mean field theoryFeb 28 2008Apr 29 2008We apply dynamical mean field theory to study a prototypical model that describes charge ordering in the presence of both electron-lattice interactions and intersite electrostatic repulsion between electrons. We calculate the optical and d.c. conductivity, ... More

Spectral properties and isotope effect in strongly interacting systems: Mott-Hubbard insulator and polaronic semiconductorMay 17 2005Jun 13 2005We study the electronic spectral properties in two examples of strongly interacting systems: a Mott-Hubbard insulator with additional electron-boson interactions, and a polaronic semiconductor. An approximate unified framework is developed for the high ... More

Heavy-quark deep-inelastic scattering with a running massNov 26 2010We study the production of heavy quarks in deep-inelastic scattering within perturbative QCD. As a novelty, we employ for the first time the running mass definition in the MSbar scheme for deep-inelastic charm and bottom production. We observe an improved ... More

Near infrared light amplification in Gold diffused Silicon-on-Insulator waveguidesNov 06 2016We report near infrared optical amplification in gold diffused silicon-on-insulator waveguides by visible optical pumping. More then 30dB/cm gain was measured for a light carrier at a wavelength of 1.55 microns

Continuous and smooth envelopes of topological algebrasMar 11 2013Sep 28 2016Since the first optical instruments have been invented, an idea that the visible image of an object under observation depends on tools of observation became commonly assumed in physics. A way to formalize it in mathematics is the construction that assigns ... More

Gas Properties in the Starburst Centers of Barred GalaxiesJul 16 2001The physical properties of molecular gas can be deduced from the analysis of line intensity ratios, most commonly of the CO isotopomers 12CO and 13CO. Barred galaxies, especially those with central starbursts, provide an excellent laboratory to study ... More

Reconnection of Unstable/Stable Manifolds of the Harper MapJun 12 2006The Harper map is one of the simplest chaotic systems exhibiting reconnection of invariant manifolds. The method of asymptotics beyond all orders (ABAO) is used to construct unstable/stable manifolds of the Harper map. By enlarging the neighborhood of ... More

Chaotic bursting in semiconductor lasersNov 28 2017We investigate the dynamic mechanisms for low frequency fluctuations in semiconductor lasers subject to delayed optical feedback, using the Lang-Kobayashi model. This system of delay differential equations displays pronounced envelope dynamics, ranging ... More

Development of verification system of socio-demographic data of virtual community memberJan 21 2019The important task of developing verification system of data of virtual community member on the basis of computer-linguistic analysis of the content of a large sample of Ukrainian virtual communities is solved. The subject of research is methods and tools ... More

Leibniz's Definition of MonadAug 12 2006This is a short discussion of the definition of monad which was given by G.W. Leibniz in his "Monadology."

Anomalous Peak Effect in CeRu2 and NbSe2 : Fracturing of a Flux Line Lattice?Sep 04 1997CeRu2 and 2H-NbSe2 display remarkable similarities in their magnetic response, reflecting the manner in which the weakly pinned flux line lattice (FLL) loses spatial order in the Peak Effect (PE) regime. The discontinuous change in screening response ... More

Magnetic Phase Diagram of Weakly Pinned Type-II SuperconductorsNov 20 1999Nov 25 1999The phenomenon of superconductivity was discovered in 1911, however, the methodology to classify and distinguish type-II superconductivity was established only in late fifties after Abrikosov's prediction of a flux line lattice in 1957. The advent of ... More

Composition dependence of magnetoresistance in Fe$_{1-x}$Ni$_{x}$ alloysMar 19 2019Resistance of Fe$_{1-x}$Ni$_x$(x=0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7 and 0.9) has been measured using four probe method from 5K to 300K with and without a longitudinal magnetic field of 8T. The zero field resistivity of x=0.1 and 0.9 alloys, predominant ... More

Subsurface diffusion in crystals and effect of surface permeability on the atomic step motionApr 01 2019Diffusion in crystals and on their surfaces is fundamental to control crystal growth, surface structure, and surface morphology. Point defects such as self-interstitials and vacancies in the bulk and adsorbed atoms (adatoms) and surface vacancies (advacancies) ... More

Exchange Interaction in Fe$_{1-x}$Ni$_{x}$Alloys: XPS StudyMar 19 2019Apr 12 2019In this paper, high Fe-concentration Fe$_{1-x}$Ni$_{x}$ alloys were investigated using high resolution X-ray photoelectron spectroscopy (XPS) down to 10K temperature. The Fe 2s core level exhibits three features, two low binding features corresponding ... More

Two-dimensional C/BN core/shell structuresAug 02 2014Single layer core/shell structures consisting of graphene as core and hexagonal boron nitride as shell are studied using first-principles plane wave method within density functional theory. Electronic energy level structure is analysed as a function of ... More

Sandpile Models of Self-Organized CriticalityAug 23 1999Self-Organized Criticality is the emergence of long-ranged spatio-temporal correlations in non-equilibrium steady states of slowly driven systems without fine tuning of any control parameter. Sandpiles were proposed as prototypical examples of self-organized ... More

On QCD RFT corrections to the propagator of reggeized gluonsMar 27 2019We calculate one loop QCD Regge Field Theory (RFT) correction to the propagator of reggeized gluons basing on the QCD effective action of Lipatov, \cite{LipatovEff,LipatovEff1,Our1,Our2,Our3,Our4}, and results of \cite{Our5}, where Dyson-Schwinger hierarchy ... More

Alexandrov's Approach to the Minkowski ProblemAug 30 2012This article is dedicated to the centenary of the birth of Aleksandr D. Alexandrov (1912-1999). His functional-analytical approach to the solving of the Minkowski problem is examined and applied to the extremal problems of isoperimetric type with conflicting ... More

Enhancement of H -> gamma gamma in SU(5) model with 45_H pletApr 12 2013We show that the low energy effective model derived from SU(5) with 45-plet Higgs can account for the recently reported enhanced diphoton decay rate of the Standard Model (SM)-like Higgs with mass about 125 GeV. This model extends the SM by an extra Higgs ... More

Finite-Larmor-radius equilibrium and currents of the Earth's flank magnetopauseApr 06 2018Aug 20 2018We consider the one-dimensional equilibrium problem of a shear-flow boundary layer within an "extended Hall-MHD" (eHMHD) model of plasma that retains first-order finite Larmor radius (FLR) corrections to the ion dynamics. We provide a generalized version ... More

Spectral Radius Inequalities for Functions of Operators Defined by Power SeriesFeb 11 2013By the help of power series f we can naturally construct another power series that has as coefficients the absolute values of the coefficients of f. Utilising these functions we prove some inequalities for the spectral radius of the bounded linear operator ... More

Holomorphic Functions of Exponential Type and Duality for Stein Groups with Algebraic Connected Component of IdentityJun 19 2008Nov 01 2009We suggest a generalization of Pontryagin duality from the category of commutative Stein groups to the category of (not necessarily commutative) Stein groups with algebraic connected component of identity. In contrast to the other similar generalizations, ... More

p-Adic Fractional Differentiation Operator with Point InteractionsDec 19 2006Finite rank point perturbations of the $p$-adic fractional differentiation operator $D^{\alpha}$ are studied. The main attention is paid to the description of operator realizations (in $L_2(\mathbb{Q}_p)$) of the heuristic expression $D^{\alpha}+\sum_{i,j=1}^{n}b_{ij}<\delta_{x_j}, ... More

A Classical Fuzzy Approach for Software Effort Estimation on Machine Learning TechniqueDec 16 2011Software Cost Estimation with resounding reliability,productivity and development effort is a challenging and onerous task. This has incited the software community to give much needed thrust and delve into extensive research in software effort estimation ... More

Math-SelfieJan 05 2015This is a write up on some sections of convex geometry, functional analysis, optimization, and nonstandard models that attract the author.

Tensor Products of Cohen-Macaulay Rings. Solution to a Problem of GrothendieckJun 27 2006In this paper we solve a problem, originally raised by Grothendieck, on the transfer of Cohen-Macaulayness to tensor products of algebras over a field. As a prelude to this, we investigate the grade for some specific types of ideals that play a primordial ... More

On the prime ideal structure of symbolic Rees algebrasFeb 28 2009This paper contributes to the study of the prime spectrum and dimension theory of symbolic Rees algebra over Noetherian domains. We first establish some general results on the prime ideal structure of subalgebras of affine domains, which actually arise, ... More

Embedding dimension and codimension of tensor products of algebras over a fieldJan 19 2017Let k be a field. This paper investigates the embedding dimension and codimension of Noetherian local rings arising as localizations of tensor products of k-algebras. We use results and techniques from prime spectra and dimension theory to establish an ... More