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Multi-class classification: mirror descent approachJun 30 2016We consider the problem of multi-class classification and a stochastic opti- mization approach to it. We derive risk bounds for stochastic mirror descent algorithm and provide examples of set geometries that make the use of the algorithm efficient in ... More

A grid of upper atmosphere models for 1--40 MEARTH planets: application to CoRoT-7 b and HD219134 b,cSep 18 2018There is growing observational and theoretical evidence suggesting that atmospheric escape is a key driver of planetary evolution. Commonly, planetary evolution models employ simple analytic formulae (e.g., energy limited escape) that are often inaccurate, ... More

Overcoming the limitations of the energy-limited approximation for planet atmospheric escapeOct 16 2018Studies of planetary atmospheric composition, variability, and evolution require appropriate theoretical and numerical tools to estimate key atmospheric parameters, among which the mass-loss rate is often the most important. In evolutionary studies, it ... More

Quantitative Borell-Brascamp-Lieb inequalities for compactly supported power concave functions (and some applications)Feb 10 2015Aug 04 2015We strengthen, in two different ways, the so called Borell-Brascamp- Lieb inequality in the class of power concave functions with compact support. As examples of applications we obtain two quantitative versions of the Brunn- Minkowski inequality and of ... More

On a monotone scheme for nonconvex nonsmooth optimization with applications to fracture mechanicsApr 19 2018A general class of nonconvex optimization problems is considered, where the penalty is the composition of a linear operator with a nonsmooth nonconvex mapping, which is concave on the positive real line. The necessary optimality condition of a regularized ... More

Simple non-extensive sparsification of the hierarchical matricesMay 12 2017Apr 28 2018In this paper, we consider the matrices approximated in H2 format. The direct solution, as well as the preconditioning, of systems with such matrices is a challenging problem. We propose a non-extensive sparse factorization of the H2 matrix that allows ... More

Band bending at the interface in Polyethylene-MgO nanocomposite dielectricNov 30 2016Polymer nanocomposite dielectrics are promising materials for electrical insulation in high voltage applications. However, the physics behind their performance is not yet fully understood. We use density functional theory to investigate electronic properties ... More

Super-Poissonian Shot Noise as a Measure of Dephasing in Closed Quantum DotsMay 18 2007Electron-electron interactions play a major role in determining the low-temperature rate of phase loss of electrons in mesoscopic systems. The study of the dephasing rate is expected to contribute to the understanding of the many-body nature of such systems. ... More

Study of double parton scattering processes with heavy quarksNov 29 2017Study of double parton scattering processes (DPS) involving heavy quarks provides the most precise probing of factorization hypothesis for DPS for gluon-mediated processes. The measurements are performed for the different final states, including open ... More

On the monotone and primal-dual active set schemes for $\ell^p$-type problems, $p \in (0,1]$Sep 19 2017Nonsmooth nonconvex optimization problems involving the $\ell^p$ quasi-norm, $p \in (0, 1]$, of a linear map are considered. A monotonically convergent scheme for a regularized version of the original problem is developed and necessary optimality conditions ... More

Temporal Bibliographic NetworksMar 02 2019We present two ways (instantaneous and cumulative) to transform bibliographic networks, using the works' publication year, into corresponding temporal networks based on temporal quantities. We also show how to use the addition of temporal quantities to ... More

Distributed Control with Low-Rank CoordinationOct 03 2013Dec 29 2013A common approach to distributed control design is to impose sparsity constraints on the controller structure. Such constraints, however, may greatly complicate the control design procedure. This paper puts forward an alternative structure, which is not ... More

Active Tile Self-assembly, Self-similar Structures and RecursionNov 13 2012We present an active tile assembly model which extends Winfree's abstract tile assembly model to tiles that are capable of transmitting and receiving binding site activation signals. In addition, we introduce a mathematical framework to address self-similarity ... More

Tight Risk Bounds for Multi-Class Margin ClassifiersJul 10 2015Jul 02 2016We consider a problem of risk estimation for large-margin multi-class classifiers. We propose a novel risk bound for the multi-class classification problem. The bound involves the marginal distribution of the classifier and the Rademacher complexity of ... More

Social Network Analysis: Bibliographic Network Analysis of the Field and its Evolution / Part 1. Basic Statistics and Citation Network AnalysisDec 14 2018In this paper, we present the results of the study on the development of social network analysis (SNA) discipline and its evolution over time, using the analysis of bibliographic networks. The dataset consists of articles from the Web of Science Clarivate ... More

Imaging interatomic electron current in crystals with ultrafast resonant x-ray scatteringNov 09 2015We demonstrate how the technique of ultrafast resonant x-ray scattering can be applied to imaging dynamics of electronic wave packets in crystals. We study scattering patterns from crystals with electron dynamics in valence bands taking into account that ... More

Imaging instantaneous electron flow with ultrafast resonant x-ray scatteringMay 27 2015We propose a novel way to image dynamical properties of nonstationary electron systems using ultrafast resonant x-ray scattering. Employing a rigorous theoretical analysis within the framework of quantum electrodynamics, we demonstrate that a single scattering ... More

A Constraint Programming Approach for Solving a Queueing Control ProblemOct 31 2011In a facility with front room and back room operations, it is useful to switch workers between the rooms in order to cope with changing customer demand. Assuming stochastic customer arrival and service times, we seek a policy for switching workers such ... More

Multipolar nonlinear nanophotonicsSep 07 2016Nonlinear nanophotonics is a rapidly developing field with many useful applications for a design of nonlinear nanoantennas, light sources, nanolasers, sensors, and ultrafast miniature metadevices. A tight confinement of the local electromagnetic fields ... More

Preconditioners for hierarchical matrices based on their extended sparse formDec 03 2014In this paper we consider linear systems with dense-matrices which arise from numerical solution of boundary integral equations. Such matrices can be well-approximated with $\mathcal{H}^2$-matrices. We propose several new preconditioners for such matrices ... More

The balance of power: accretion and feedback in stellar mass black holesMay 13 2015In this review we discuss the population of stellar-mass black holes in our galaxy and beyond, which are the extreme endpoints of massive star evolution. In particular we focus on how we can attempt to balance the available accretion energy with feedback ... More

Consistency and Completeness of Rewriting in the Calculus of ConstructionsJun 10 2008Sep 15 2008Adding rewriting to a proof assistant based on the Curry-Howard isomorphism, such as Coq, may greatly improve usability of the tool. Unfortunately adding an arbitrary set of rewrite rules may render the underlying formal system undecidable and inconsistent. ... More

Second-harmonic generation in subwavelength graphene waveguidesAug 04 2014We suggest a novel approach for generating second-harmonic radiation in subwavelength graphene waveguides. We demonstrate that quadratic phase matching between the plasmonic guided modes of different symmetries can be achieved in a planar double-layer ... More

The transiting system HD 15337: a pair of nearly equal-mass sub-Neptunes on opposite sides of the radius gapMar 13 2019Mar 14 2019We report the discovery of two small planets transiting the star HD 15337 (TOI-402, TIC 120896927), a bright (V=9) K1 V dwarf observed by the Transiting Exoplanet Survey Satellite (TESS ) in Sectors 3 and 4. We combine the TESS photometry with archival ... More

Imaging electron dynamics with time- and angle-resolved photoelectron spectroscopyJul 05 2016We theoretically study how time- and angle-resolved photoemission spectroscopy can be applied for imaging coherent electron dynamics in molecules. We consider a process in which a pump pulse triggers coherent electronic dynamics in a molecule by creating ... More

Large deviations for some fast stochastic volatility models by viscosity methodsMay 13 2014We consider the short time behaviour of stochastic systems affected by a stochastic volatility evolving at a faster time scale. We study the asymptotics of a logarithmic functional of the process by methods of the theory of homogenisation and singular ... More

A Computational Study on Emotions and Temperament in Multi-Agent SystemsSep 27 2008Recent advances in neurosciences and psychology have provided evidence that affective phenomena pervade intelligence at many levels, being inseparable from the cognitionaction loop. Perception, attention, memory, learning, decisionmaking, adaptation, ... More

"Compress and eliminate" solver for symmetric positive definite sparse matricesMar 30 2016Nov 19 2016We propose a new approximate factorization for solving linear systems with symmetric positive definite sparse matrices. In a nutshell the algorithm is to apply hierarchically block Gaussian elimination and additionally compress the fill-in. The systems ... More

A Search for Dying Pulse Trains in Cyg X-1 using RXTEApr 15 2011Jul 08 2011Dying pulse trains (DPTs) pulses of radiation with decreasing intensity and decreasing intervals between them are predicted by General Relativity to occur from material spiraling into an event horizon after detaching from the last stable orbit in an accretion ... More

Probabilistic Matching of Planar RegionsFeb 25 2009We analyze a probabilistic algorithm for matching shapes modeled by planar regions under translations and rigid motions (rotation and translation). Given shapes $A$ and $B$, the algorithm computes a transformation $t$ such that with high probability the ... More

On the Szegö kernel of Cartan-Hartogs domainsOct 06 2014Inspired by the work of Z. Lu and G. Tian [21] in the compact setting, in this paper we address the problem of studying the Szeg\"o kernel of the disk bundle over a noncompact K\"ahler manifold. In particular we compute the Szeg\"o kernel of the disk ... More

Quantum spin Hall effect of lightFeb 11 2015May 20 2015Maxwell's equations, formulated 150 years ago, ultimately describe properties of light, from classical electromagnetism to quantum and relativistic aspects. The latter ones result in remarkable geometric and topological phenomena related to the spin-1 ... More

Schrödinger Operators with $δ$-interactions in a Space of Vector-Valued FunctionsMar 02 2016We study spectral properties of Schr\"odinger operators with $\delta$-interactions on a semi-axis by using the theory of boundary triplets and the corresponding Weyl functions. We establish a connection between spectral properties (deficiency indices, ... More

Solvability of Hammerstein integral equations with applications to boundary value problemsJul 06 2016In this paper we present some new results regarding the solvability of nonlinear Hammerstein integral equations in a special cone of continuous functions. The proofs are based on a certain fixed point theorem of Leggett and Williams type. We give an application ... More

H2 Optimal Coordination of Homogeneous Agents Subject to Limited Information ExchangeJan 19 2016Controllers with a diagonal-plus-low-rank structure constitute a scalable class of controllers for multi-agent systems. Previous research has shown that diagonal-plus-low-rank control laws appear as the optimal solution to a class of multi-agent H2 coordination ... More

Cascaded third harmonic generation in hybrid graphene-semiconductor waveguidesJul 06 2015We study cascaded harmonic generation of hybrid surface plasmons in integrated planar waveguides composed of a graphene layer and a doped-semiconductor slab. We derive a comprehensive model of cascaded third harmonic generation through phase-matched nonlinear ... More

The kinematics and chemical stratification of the Type Ia supernova remnant 0519-69.0Jan 07 2010May 10 2010We present an analysis of the XMM-Newton and Chandra X-ray data of the young Type Ia supernova remnant 0519-69.0 in the Large Magellanic Cloud. We used data from both the Chandra ACIS and XMM-Newton EPIC-MOS instruments, and high resolution X-ray spectra ... More

A trip to the end of the universe and the twin paradoxDec 13 2006In principle, the twin paradox offers the possibility to go on a trip to the center of our galaxy or even to the end of our universe within life time. In order to be a most comfortable journey the voyaging twin accelerates with Earth's gravity. We developed ... More

Parity anomaly laserNov 15 2018We propose a novel supersymmetry-inspired scheme for achieving disorder-robust single mode lasing in arrays of coupled microcavities, based on factorizing a given array Hamiltonian into its `supercharge' partner array. Pumping a single sublattice of the ... More

Emulating Batteries with Deferrable Energy Demand: Fundamental Trade-offs and Scheduling PoliciesNov 11 2016We investigate the ability of a homogeneous collection of deferrable energy loads to behave as a battery; that is, to absorb and release energy in a controllable fashion up to fixed and predetermined limits on volume, charge rate and discharge rate. We ... More

Battery Capacity of Deferrable Energy DemandSep 27 2016We investigate the ability of a homogeneous collection of deferrable energy loads to behave as a battery; that is, to absorb and release energy in a controllable fashion up to fixed and predetermined limits on volume, charge rate and discharge rate. We ... More

Deep Inverse OptimizationDec 03 2018Given a set of observations generated by an optimization process, the goal of inverse optimization is to determine likely parameters of that process. We cast inverse optimization as a form of deep learning. Our method, called deep inverse optimization, ... More

"Compress and eliminate" solver for symmetric positive definite sparse matricesMar 30 2016May 05 2018We propose a new approximate factorization for solving linear systems with symmetric positive definite sparse matrices. In a nutshell the algorithm is to apply hierarchically block Gaussian elimination and additionally compress the fill-in. The systems ... More

Nonvolatile Memory Cells Based on MoS2/Graphene HeterostructuresMar 20 2013Memory cells are an important building block of digital electronics. We combine here the unique electronic properties of semiconducting monolayer MoS2 with the high conductivity of graphene to build a 2D heterostructure capable of information storage. ... More

Parity anomaly laserNov 15 2018Feb 15 2019We propose a novel supersymmetry-inspired scheme for achieving robust single mode lasing in arrays of coupled microcavities, based on factorizing a given array Hamiltonian into its "supercharge" partner array. Pumping a single sublattice of the partner ... More

On the outburst evolution of H1743-322: a 2008/2009 comparisonJun 24 2010We present two observational campaigns performed with the RXTE satellite on the black hole transient H 1743-322. The source was observed in outburst on two separate occasions between October-November 2008 and May-July 2009. We have carried out timing ... More

"Compress and eliminate" solver for symmetric positive definite sparse matricesMar 30 2016Apr 10 2016We propose a new approximate factorization for solving linear systems with symmetric positive definite sparse matrices. In a nutshell the algorithm is to apply hierarchically block Gaussian elimination and additionally compress the fill-in. The systems ... More

Transmission conditions for thin curvilinear close to circular heat-resistant interphases in composite ceramicsNov 20 2015Apr 20 2016This paper considers the problem of heat transfer in a composite ceramic material where the structural elements are bonded to the matrix via a thin heat resistant adhesive layer. The layer has the form of a circular ring or close to it. Using an asymptotic ... More

Robust Kalman tracking and smoothing with propagating and non-propagating outliersApr 16 2012Nov 26 2012A common situation in filtering where classical Kalman filtering does not perform particularly well is tracking in the presence of propagating outliers. This calls for robustness understood in a distributional sense, i.e.; we enlarge the distribution ... More

Nonlinear generation of quantum-entangled photons from high-Q states in dielectric nanoparticlesAug 14 2018We develop multipolar theory of nonlinear generation of entangled photons from subwavelength dielectric particles due to the spontaneous parametric downconversion. We demonstrate that optical excitation in resonance with the high-quality supercavity mode ... More

Study of KS semileptonic decays and CPT test with the KLOE detectorSep 03 2015Study of semileptonic decays of neutral kaons allows to perform a test of discrete symmetries, as well as basic principles of the Standard Model. In this paper a general review on dependency between charge asymmetry constructed for semileptonic decays ... More

Motion of grains in a vibrated U-tubeJan 14 2010We investigate experimentally the behavior of the rate of growth of a column of grains, in a partially filled vertically shaken U-tube. For the set of frequencies used we identify three qualitatively different behaviors for the growth rate $\gamma$ as ... More

Junction conditions for finite horizon optimal control problems on multi-domains with continuous and discontinuous solutionsJul 20 2017This paper deals with junction conditions for Hamilton-Jacobi-Bellman (HJB) equations for finite horizon control problems on multi-domains. We consider two different cases where the final cost is continuous or lower semi-continuous. In the continuous ... More

L_2 Differentiability of Generalized Linear ModelsJul 22 2014Nov 24 2014We derive conditions for $L_2$ differentiability of generalized linear models with error distributions not necessarily belonging to exponential families, covering both cases of stochastic and deterministic regressors. These conditions induce smoothness ... More

Structure of the particle population for a branching random walk with a critical reproduction lawMar 06 2019We consider a continuous-time symmetric branching random walk on the $d$-dimensional lattice, $d\ge 1$, and assume that at the initial moment there is one particle at every lattice point. Moreover, we assume that the underlying random walk has a finite ... More

Solvability of Hammerstein integral equations with applications to boundary value problemsJul 06 2016Feb 04 2017In this paper we present some new results regarding the solvability of nonlinear Hammerstein integral equations in a special cone of continuous functions. The proofs are based on a certain fixed point theorem of Leggett and Williams type. We give an application ... More

Non-Standard Heavy Mesons and Baryons, an Experimental ReviewAug 14 2017Quantum Chromodynamics (QCD), the generally accepted theory for the strong interactions, describes the interactions between quarks and gluons. The strongly interacting particles that are seen in nature are hadrons, which are composites of quarks and gluons. ... More

Young planets under extreme UV irradiation. I. Upper atmosphere modelling of the young exoplanet K2-33bDec 21 2017The K2-33 planetary system hosts one transiting ~5 R_E planet orbiting the young M-type host star. The planet's mass is still unknown, with an estimated upper limit of 5.4 M_J. The extreme youth of the system (<20 Myr) gives the unprecedented opportunity ... More

Intersubband plasmon excitations in doped carbon nanotubesNov 28 2018Feb 07 2019We theoretically investigate intersubband plasmon excitations in doped single wall carbon nanotubes (SWNTs) by examining the dependence of plasmon frequency on the nanotube diameter, chirality, and Fermi energy. The intersubband plasmons can be excited ... More

Effect of stellar wind induced magnetic fields on planetary obstacles of non-magnetized hot JupitersAug 04 2017We investigate the interaction between the magnetized stellar wind plasma and the partially ionized hydrodynamic hydrogen outflow from the escaping upper atmosphere of non- or weakly magnetized hot Jupiters. We use the well-studied hot Jupiter HD 209458b ... More

Aeronomical constraints to the minimum mass and maximum radius of hot low-mass planetsDec 16 2016Stimulated by the discovery of a number of close-in low-density planets, we generalise the Jeans escape parameter taking hydrodynamic and Roche lobe effects into account. We furthermore define $\Lambda$ as the value of the Jeans escape parameter calculated ... More

The "K-Correction" for Irradiated Emission Lines in LMXBs: Evidence for a Massive Neutron Star in X1822-371 (V691 CrA)Aug 25 2005We study the K-correction for the case of emission lines formed in the X-ray illuminated atmosphere of a Roche lobe filling star. We compute the K-correction as function of the mass ratio 'q' and the disc flaring angle 'alpha' using a compact binary code ... More

The faint 2011 outburst of the black hole X-ray binary candidate MAXI J1543-564Jan 27 2012We report on a spectral-timing analysis of the black hole X-ray binary candidate MAXI J1543- 564 during its 2011 outburst. All 99 pointed observations of this outburst obtained with the Rossi X-ray Timing Explorer (RXTE) were included in our study. We ... More

The black hole candidate MAXI J1659-152: spectral and timing analysis during its 2010 outburstMar 11 2011We present a comprehensive spectral-timing study of the black hole candidate MAXI J1659-152 during its 2010 outburst. We analysed 65 RXTE observations taken along this period and computed the fundamental diagrams commonly used to study black hole transients. ... More

Spectral properties of transitions between soft and hard state in GX 339-4Aug 10 2011We present a study of the spectral properties during state transition of GX 339-4. Data are taken from the 2010 outburst of GX 339-4, which is densely covered by Rossi X-ray Timing Explorer, providing an excellent coverage of the state transitions between ... More

Tracing the reverberation lag in the hard state of black hole X-ray binariesOct 09 2015We report results obtained from a systematic analysis of X-ray lags in a sample of black hole X-ray binaries, with the aim of assessing the presence of reverberation lags and studying their evolution during outburst. We used XMM-Newton and simultaneous ... More

Using Capacitance Methods for Interface Trap Level Density Extraction in Graphene Field-Effect DevicesOct 24 2011Feb 02 2012Methods of extraction of interface trap level density in graphene field-effect devices from the capacitance-voltage measurements are described and discussed. Interrelation with the graphene Fermi velocity extraction is shown. Similarities and differences ... More

MoS2 Transistors Operating at Gigahertz FrequenciesSep 23 2014The presence of a direct band gap and an ultrathin form factor has caused a considerable interest in two-dimensional (2D) semiconductors from the transition metal dichalcogenides (TMD) family with molybdenum disulphide (MoS2) being the most studied representative ... More

High-frequency, scaled MoS2 transistorsSep 02 2016The interest in MoS2 for radio-frequency (RF) application has recently increased. However, little is known on the scaling behavior of transistors made from MoS2 for RF applications, which is important for establishing performance limits for electronic ... More

The featureless and non-variable optical spectral energy distribution of AXP 4U 0142+61Feb 10 2016We present GTC-10.4m spectroscopy and multi-band photometry of the faint (r ~26) optical counterpart of the anomalous X-ray pulsar 4U 0142+61. The 5000 - 9000 Angs spectrum -- the first obtained for a magnetar -- is featureless, allowing us to set an ... More

A connection between accretion state and $\textit{Fe K absorption}$ in an accreting neutron star: black hole-like soft state winds?Jul 16 2014High resolution X-ray spectra of accreting stellar mass Black Holes reveal the presence of accretion disc winds, traced by high ionisation Fe K lines. These winds appear to have an equatorial geometry and to be observed only during disc dominated states ... More

The evolution of the disc variability along the hard state of the black hole transient GX 339-4Aug 31 2015We report on the analysis of hard-state power spectral density function (PSD) of GX 339-4 down to the soft X-ray band, where the disc significantly contributes to the total emission. At any luminosity probed, the disc in the hard state is intrinsically ... More

Multilayer graphene waveguidesFeb 26 2014We study dispersion properties of TM-polarized electromagnetic waves guided by a multilayer graphene metamaterial. We demonstrate that both dispersion and localization of the guided modes can be efficiently controlled by changing the number of layers ... More

Inverse Optimization: Closed-form Solutions, Geometry and Goodness of fitNov 15 2015Jun 22 2017In classical inverse linear optimization, one assumes a given solution is a candidate to be optimal. Real data is imperfect and noisy, so there is no guarantee this assumption is satisfied. Inspired by regression, this paper presents a unified framework ... More

Measurement of the ratio of branching fractions $\frac{\mathcal{BR}(B^0\to K^*γ)}{\mathcal{BR}(B_s^0\toφγ)}$Feb 02 2012The interest to the rare radiative decays of the B-mesons at LHCb is mostly aroused due to the measurement of the photon polarization in the $B_s^0\to\phi\gamma$ decay, which may provide a sensitive probe for the Standard Model. The LHCb experiment has ... More

Multimodal Clustering for Community DetectionFeb 27 2017Multimodal clustering is an unsupervised technique for mining interesting patterns in $n$-adic binary relations or $n$-mode networks. Among different types of such generalized patterns one can find biclusters and formal concepts (maximal bicliques) for ... More

The low-luminosity accretion disc wind of the black hole transient V4641 SagittariiJun 28 2018We present an optical spectroscopic study of the black hole X-ray transient V4641 Sgr (=SAX J1819.3-2525) covering the 1999, 2002 and 2004 outbursts. The spectra were taken over 22 different epochs during the low luminosity phases that follow the sharp ... More

On the masses and evolutionary status of the black hole binary GX 339-4. A twin system of XTE J1550-564?Jan 21 2008We apply the K-correction to the black hole LMXB GX 339-4 which implies Mx > 6 Msun by only assuming that the companion is more massive than ~0.17 Msun, the lower limit allowed by applying a 'stripped-giant' model. This evolutionary model successfully ... More

Time-Delayed transfer functions simulations for LMXBsJul 04 2005Recent works (Steeghs & Casares 2002, Casares et al. 2003, Hynes et al. 2003) have demonstrated that Bowen flourescence is a very efficient tracer of the companion star in LMXBs. We present a numerical code to simulate time-delayed transfer functions ... More

X-ray spectral and timing investigations of XTE J1752-223Mar 22 2011We report on X-ray monitoring observations of the transient black hole candidate (BHC) XTE J1752-223 with the Rossi X-ray Timing Explorer (RXTE). The source was discovered on 2009 October 23 and during its low/hard state, which lasted for at least 25 ... More

Structured Adiabatic Quantum SearchAug 09 2002We examine the use of adiabatic quantum algorithms to solve structured, or nested, search problems. We construct suitable time dependent Hamiltonians and derive the computation times for a general class of nested searches involving n qubits. As expected, ... More

How scientific literature has been evolving over the time? A novel statistical approach using tracking verbal-based methodsFeb 05 2016This paper provides a global vision of the scientific publications related with the Systemic Lupus Erythematosus (SLE), taking as starting point abstracts of articles. Through the time, abstracts have been evolving towards higher complexity on used terminology, ... More

Simulation of grains in a vibrated U-tube without interstitial fluidJun 28 2012We present a computational study using Molecular Dynamics of the development of an accumulation of grains in one side of a two dimensional U-tube under vertical vibrations. Studying the evolution of the height difference between the centers of mass of ... More

Ultimate entanglement robustness of two-qubit states against general local noisesAug 28 2017Jan 21 2018We study the problem of optimal preparation of a bipartite entangled state, which remains entangled the longest time under action of local qubit noises. We show that for unital noises such a state is always maximally entangled, whereas for nonunital noises, ... More

Dynamics of convective carbon dioxide dissolution in a closed porous media systemJan 08 2018Motivated by geological carbon dioxide (CO$_2$) storage, many recent studies have investigated the fluid dynamics of solutal convection in porous media. Here we study the convective dissolution of CO$_2$ in a closed system, where the pressure in the gas ... More

An Extended Neo-Fuzzy Neuron and its Adaptive Learning AlgorithmOct 20 2016A modification of the neo-fuzzy neuron is proposed (an extended neo-fuzzy neuron (ENFN)) that is characterized by improved approximating properties. An adaptive learning algorithm is proposed that has both tracking and smoothing properties. An ENFN distinctive ... More

Constant spacing in filament bundlesFeb 17 2019Assemblies of filaments appear in a wide range of systems: from biopolymer bundles, columnar liquid crystals, and superconductor vortex arrays; to familiar macroscopic materials, like ropes, cables and textiles. Interactions between the constituent filaments ... More

Rapid Data Search using Adiabatic Quantum ComputationAug 15 2002We show that by a suitable choice of time-dependent Hamiltonian, the search for a marked item in an unstructured database can be achieved in unit time, using Adiabatic Quantum Computation. This is a considerable improvement over the O(sqrt(N)) time required ... More

Fast variability as a tracer of accretion regimes in black hole transientsAug 03 2010We present the rms-intensity diagram for black hole transients. Using observations taken with the Rossi X-ray timing explorer we study the relation between the root mean square (rms) amplitude of the variability and the net count-rate during the 2002, ... More

Black hole transientsSep 15 2011Sep 18 2011Sixteen years of observations of black hole transients with the Rossi X-ray Timing Explorer, complemented by other X-ray observatories and ground-based optical/infrared/radio telescopes have given us a clear view of the complex phenomenology associated ... More

Wavefronts and Light Cones for Kerr SpacetimesDec 27 2014We investigate the light propagation by means of simulations of wavefronts and light cones for Kerr spacetimes. Simulations of this kind give us a new insight to better understand the light propagation in presence of massive rotating black holes. A relevant ... More

A Multidimensional Cascade Neuro-Fuzzy System with Neuron Pool Optimization in Each CascadeOct 20 2016A new architecture and learning algorithms for the multidimensional hybrid cascade neural network with neuron pool optimization in each cascade are proposed in this paper. The proposed system differs from the well-known cascade systems in its capability ... More

Optical anapoles in nanophotonics and meta-opticsOct 05 2018Interference of electromagnetic modes supported by subwavelength photonic structures is one of the key concepts that underpins the subwavelength control of light in meta-optics. It drives the whole realm of all-dielectric Mie-resonant nanophotonics with ... More

Goodness of Fit in Inverse OptimizaitonNov 15 2015The classical inverse optimization methodology for linear optimization assumes a given solution is a candidate to be optimal. Real data, however, is imperfect and noisy: there is no guarantee that a given solution is optimal for any cost vector. Inspired ... More

A differential equation for the flow rate during silo discharge: Beyond the Beverloo ruleNov 16 2016We present a differential equation for the flow rate of granular materials during the discharge of a silo. This is based in the energy balance of the variable mass system in contrast with the traditional derivations based on heuristic postulates such ... More

Flow rate of granular media: Breakdown of the Beverloo's scalingMar 10 2017The Beverloo's scaling for the gravity flow of granular materials through orifices has two distinct universal features. On the one hand, much highlighted in the literature, the flow rate is independent of the height of the granular column. On the other ... More

Proximity effect in atomic-scaled hybrid superconductor/ferromagnet structures: crucial role of electron spectraMay 26 2009We study the influence of the configuration of the majority and minority spin subbands of electron spectra on the properties of atomic-scaled superconductor-ferromagnet S-F-S and F-S-F hybrid structures. At low temperatures, the S/F/S junction is either ... More

How marketing vocabulary was evolving from 2005 to 2014? An illustrative application of statistical methods on text miningFeb 05 2016Here a collection of 1169 abstracts, which corresponds to articles that the Journal of Marketing Research has published from 2005 to 2014, are analysed under a novel approach. We apply several statistical methods, such as Principal Components Analysis ... More

Multipolar second-harmonic generation by Mie-resonant dielectric nanoparticlesSep 26 2017Nov 12 2017By combining analytical and numerical approaches, we study resonantly enhanced second-harmonic generation (SHG) by individual high-index dielectric nanoparticles made of centrosymmetric materials. Considering both bulk and surface nonlinearities, we describe ... More

Multiple Observations and Goodness of Fit in Generalized Inverse OptimizationApr 12 2018This paper develops a generalized inverse linear optimization framework for imputing objective function parameters given a data set containing both feasible and infeasible points. We devise assumption-free, exact solution methods to solve the inverse ... More