Results for "André F. T. Martins"

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Parsing as ReductionFeb 27 2015We reduce phrase-representation parsing to dependency parsing. Our reduction is grounded on a new intermediate representation, "head-ordered dependency trees", shown to be isomorphic to constituent trees. By encoding order information in the dependency ... More
From Softmax to Sparsemax: A Sparse Model of Attention and Multi-Label ClassificationFeb 05 2016Feb 08 2016We propose sparsemax, a new activation function similar to the traditional softmax, but able to output sparse probabilities. After deriving its properties, we show how its Jacobian can be efficiently computed, enabling its use in a network trained with ... More
Learning Classifiers with Fenchel-Young Losses: Generalized Entropies, Margins, and AlgorithmsMay 24 2018Feb 22 2019This paper studies Fenchel-Young losses, a generic way to construct convex loss functions from a regularization function. We analyze their properties in depth, showing that they unify many well-known loss functions and allow to create useful new ones ... More
Learning with Fenchel-Young LossesJan 08 2019Over the past decades, numerous loss functions have been been proposed for a variety of supervised learning tasks, including regression, classification, ranking, and more generally structured prediction. Understanding the core principles and theoretical ... More
Contextual Neural Model for Translating Bilingual Multi-Speaker ConversationsSep 02 2018Recent works in neural machine translation have begun to explore document translation. However, translating online multi-speaker conversations is still an open problem. In this work, we propose the task of translating Bilingual Multi-Speaker Conversations, ... More
SparseMAP: Differentiable Sparse Structured InferenceFeb 12 2018Jun 20 2018Structured prediction requires searching over a combinatorial number of structures. To tackle it, we introduce SparseMAP: a new method for sparse structured inference, and its natural loss function. SparseMAP automatically selects only a few global structures: ... More
Sparse Sequence-to-Sequence ModelsMay 14 2019Sequence-to-sequence models are a powerful workhorse of NLP. Most variants employ a softmax transformation in both their attention mechanism and output layer, leading to dense alignments and strictly positive output probabilities. This density is wasteful, ... More
Sparse and Constrained Attention for Neural Machine TranslationMay 21 2018In NMT, words are sometimes dropped from the source or generated repeatedly in the translation. We explore novel strategies to address the coverage problem that change only the attention transformation. Our approach allocates fertilities to source words, ... More
Towards Dynamic Computation Graphs via Sparse Latent StructureSep 03 2018Deep NLP models benefit from underlying structures in the data---e.g., parse trees---typically extracted using off-the-shelf parsers. Recent attempts to jointly learn the latent structure encounter a tradeoff: either make factorization assumptions that ... More
Selective Attention for Context-aware Neural Machine TranslationMar 21 2019Despite the progress made in sentence-level NMT, current systems still fall short at achieving fluent, good quality translation for a full document. Recent works in context-aware NMT consider only a few previous sentences as context and may not scale ... More
OpenKiwi: An Open Source Framework for Quality EstimationFeb 22 2019We introduce OpenKiwi, a Pytorch-based open source framework for translation quality estimation. OpenKiwi supports training and testing of word-level and sentence-level quality estimation systems, implementing the winning systems of the WMT 2015-18 quality ... More
Jointly Extracting and Compressing Documentswith Summary State RepresentationsApr 03 2019We present a new neural model for text summarization that first extracts sentences from a document and then compresses them. The proposed model offers a balance that sidesteps the difficulties in abstractive methods while generating more concise summaries ... More
Jointly Extracting and Compressing Documents with Summary State RepresentationsApr 03 2019Apr 05 2019We present a new neural model for text summarization that first extracts sentences from a document and then compresses them. The proposed model offers a balance that sidesteps the difficulties in abstractive methods while generating more concise summaries ... More
Baryons made of heavy quarks at the LHCSep 29 2014Oct 08 2014Baryons made of heavy quarks are extremely interesting and could be seen at the LHC.
The Froissart bound for inelastic cross-sectionsApr 23 2009Aug 14 2009We prove that while the total cross{}-section is bounded by $(\pi/m_\pi^2) \ln^2 s$, where $s$ is the square of the c.m. energy and $m_\pi$ the mass of the pion, the total inelastic cross{}-section is bounded by $(1/4)(\pi/m_\pi^2) \ln^2 s$, which is ... More
The rigorous analyticity-unitarity program and its successesJun 16 1999We show how the combination of analyticity properties derived from local field theory and the unitarity condition (in particular positivity) leads to non-trivial physical results, including the proof of the "Froissart bound" from first principles and ... More
A theorem on the real part of the high-energy scattering amplitude near the forward directionMar 04 1997We show that if for fixed negative (physical) square of the momentum transfer t, the differential cross-section ${d\sigma\over dt}$ tends to zero and if the total cross-section tends to infinity, when the energy goes to infinity, the real part of the ... More
Marian: Fast Neural Machine Translation in C++Apr 01 2018Apr 04 2018We present Marian, an efficient and self-contained Neural Machine Translation framework with an integrated automatic differentiation engine based on dynamic computation graphs. Marian is written entirely in C++. We describe the design of the encoder-decoder ... More
Change and Aging Senescence as an adaptationMar 23 2011Understanding why we age is a long-lived open problem in evolutionary biology. Aging is prejudicial to the individual and evolutionary forces should prevent it, but many species show signs of senescence as individuals age. Here, I will propose a model ... More
A rigorous lower bound on the scattering amplitude at large angleMar 03 2019We prove a lower bound for the modulus of the amplitude for a two-body process at large scattering angle. This is based on the interplay of the analyticity of the amplitude and the positivity properties of its absorptive part. The assumptions are minimal, ... More
Lyapunov spectrum of ball quotients with applications to commensurability questionsJul 23 2012Jan 29 2015We determine the Lyapunov spectrum of ball quotients arising from cyclic coverings. The computations are performed by rewriting the sum of Lyapunov exponents as ratios of intersection numbers and by the analysis of the period map near boundary divisors. ... More
Cutting out arithmetic Teichmueller curves in genus two via Theta functionsApr 02 2015We compute the class of arithmetic genus two Teichmueller curves in the Picard group of pseudo-Hilbert modular surfaces, distinguished according to their torsion order and spin invariant. As an application, we compute the number of genus two square-tiled ... More
Non-Stationary Covariance Matrices And NoiseOct 21 2006Dec 08 2006The exact meaning of the noise spectrum of eigenvalues of the covariance matrix is discussed. In order to better understand the possible phenomena behind the observed noise, the spectrum of eigenvalues of the covariance matrix is studied under a model ... More
Don't choose theories: Normative inductive reasoning and the status of physical theoriesJan 01 2017Evaluating theories in physics used to be easy. Our theories provided very distinct predictions. Experimental accuracy was so small that worrying about epistemological problems was not necessary. That is no longer the case. The underdeterminacy problem ... More
Thou shalt not take sides: Cognition, Logic and the need for changing how we believeAug 21 2015We believe, in the sense of supporting ideas and considering them correct while dismissing doubts about them. We take sides about ideas and theories as if that was the right thing to do. And yet, from a rational point of view, this type of support and ... More
Poincaré and logarithmic Sobolev constants for metastable Markov chains via capacitary inequalitiesMay 15 2017May 11 2019We investigate the metastable behavior of reversible Markov chains on possibly countable infinite state spaces. Based on a new definition of metastable Markov processes, we compute precisely the mean transition time between metastable sets. Under additional ... More
Stop the tests: Opinion bias and statistical testsNov 20 2016When statisticians quarrel about hypothesis testing, the debate usually focus on which method is the correct one. The fundamental question of whether we should test hypothesis at all tends to be forgotten. This lack of debate has its roots on our desire ... More
Trust in the CODA model: Opinion Dynamics and the reliability of other agentsApr 12 2013A model for the joint evolution of opinions and how much the agents trust each other is presented. The model is built using the framework of the Continuous Opinions and Discrete Actions (CODA) model. Instead of a fixed probability that the other agents ... More
Mobility and Social Network Effects on Extremist OpinionsJan 16 2008Aug 11 2008Understanding the emergence of extreme opinions and in what kind of environment they might become less extreme is a central theme in our modern globalized society. A model combining continuous opinions and observed discrete actions (CODA) capable of addressing ... More
Network generation and evolution based on spatial and opinion dynamics componentsJan 10 2019In this paper, a model for a spatial network evolution based on a Metropolis simulation is presented. The model uses an energy function that depends both on the distance between the nodes and the stated preferences. The agents influence their network ... More
Opinion Particles: Classical Physics and Opinion DynamicsJul 12 2013A model for Opinion Particles, based on Bayesian-inspired models of Opinion Dynamics such as the CODA model is presented. By extending the discrete time characteristic of those models to continuous time, a theory for the movement of opinion particles ... More
Discrete Opinion models as a limit case of the CODA modelJan 22 2012Opinion Dynamics models can be, for most of them, divided between discrete and continuous. They are used in different circumstances and the relationship between them is not clear. Here we will explore the relationship between a model where choices are ... More
Poincaré and logarithmic Sobolev constants for metastable Markov chains via capacitary inequalitiesMay 15 2017We investigate the metastable behaviour of reversible Markov chains on countable infinite state spaces. Based on a definition of metastable sets, we compute precisely the mean exit time from a metastable set. Under additional size and regularity properties ... More
Distinguished self-adjoint extension of the two-body Dirac operator with Coulomb interactionMay 24 2018We study the two-body Dirac operator in a bounded external field and for a class of unbounded pair-interaction potentials, both repulsive and attractive, including the Coulomb type. Provided the coupling constant of the pair-interaction fulfills a certain ... More
Froissart Bound on Total Cross-section without Unknown ConstantsJun 21 2013Jan 21 2014We determine the scale of the logarithm in the Froissart bound on total cross-sections using absolute bounds on the D-wave below threshold for $\pi\pi$ scattering. E.g. for $\pi^0 \pi^0$ scattering we show that for c.m. energy $\sqrt{s}\rightarrow \infty ... More
A Lower Bound on Inelasticity in Pion-Pion ScatteringOct 19 2017Assuming that the pion-pion scattering amplitude and its absorptive part are analytic inside an ellipse in $t$- plane with foci $t=0$, $u=0$ and right extremity $t=4 m_{\pi}^2 +\epsilon $, ($\epsilon > 0$), except for cuts prescribed by Mandelstam representation ... More
$Ω_c$ and other charmed baryons revisitedApr 10 1995The mass of the $\Omega^0_c$ baryon with quark content (ssc) is computed in a potential model whose parameters have been determined in 1981 by fitting the spectrum of heavy mesons. It is found in perfect agreement with a recent measurement at the CERN ... More
An analytical expression for the exit probability of the q-voter model in one dimensionAug 12 2014We present in this paper an approximation that is able to give an analytical expression for the exit probability of the $q$-voter model in one dimension. This expression gives a better fit for the more recent data about simulations in large networks, ... More
Testing the validity of the Kirkwood approximation using an extended Sznajd modelSep 25 2015We revisit the deduction of the exit probability of the one dimensional Sznajd model through the Kirkwood approximation [F. Slanina et al., Europhys. Lett. 82, 18006 (2008)]. This approximation is peculiar in that in spite of the agreement with simulation ... More
Froissart Bound on Inelastic Cross Section Without Unknown ConstantsMar 04 2015Mar 31 2015Assuming that axiomatic local field theory results hold for hadron scattering, Andr\'e Martin and S. M. Roy recently obtained absolute bounds on the D-wave below threshold for pion-pion scattering and thereby determined the scale of the logarithm in the ... More
Positivity of the real part of the forward scattering amplitudeAug 28 2017We prove the general theorem that the real part of the forward two-body scattering amplitude is positive at sufficiently high energies if, above a certain energy, the total cross section increases monotonically to infinity at infinite energy.
A matching of matrix elements and parton showersAug 18 1997We propose a simple scheme to start a parton-shower evolution description from a given jet configuration in $e^+ e^-$ annihilation events. This allows a convenient combination of the full angular information content of matrix elements with the detailed ... More
Spontaneous Pattern Formation in a Polariton CondensateMay 17 2011Polariton condensation can be regarded as a self-organization phenomenon, where phase ordering is established among particles in the system. In such condensed systems, further ordering can possibly occur in the particle density distribution, under particular ... More
(Star)bursts of FIRE: observational signatures of bursty star formation in galaxiesOct 13 2015Oct 18 2015Galaxy formation models exhibit remarkable success in reproducing observed relations such as the relation between galaxies' star formation rates (SFRs) and stellar masses and the stellar mass--halo mass relation. We demonstrate that comparisons of the ... More
(Star)bursts of FIRE: observational signatures of bursty star formation in galaxiesOct 13 2015Nov 18 2016Galaxy formation models are now able to reproduce observed relations such as the relation between galaxies' star formation rates (SFRs) and stellar masses ($M_*$) and the stellar mass--halo mass relation. We demonstrate that comparisons of the short-timescale ... More
Coupling and Harnack inequalities for Sierpinski carpetsOct 01 1993Uniform Harnack inequalities for harmonic functions on the pre- and graphical Sierpinski carpets are proved using a probabilistic coupling argument. Various results follow from this, including the construction of Brownian motion on Sierpinski carpets ... More
The chromatic number of a signed graphDec 19 2014Mar 03 2016In 1982, Zaslavsky introduced the concept of a proper vertex colouring of a signed graph $G$ as a mapping $\phi\colon V(G)\to \mathbb{Z}$ such that for any two adjacent vertices $u$ and $v$ the colour $\phi(u)$ is different from the colour $\sigma(uv)\phi(v)$, ... More
Elastic and Secure Energy Forecasting in Cloud EnvironmentsMay 18 2017Although cloud computing offers many advantages with regards to adaption of resources, we witness either a strong resistance or a very slow adoption to those new offerings. One reason for the resistance is that (i) many technologies such as stream processing ... More
The Importance of Disagreeing: Contrarians and Extremism in the CODA modelJan 18 2009In this paper, we study the effects of introducing contrarians in a model of Opinion Dynamics where the agents have internal continuous opinions, but exchange information only about a binary choice that is a function of their continuous opinion, the CODA ... More
Asymptotic properties of the solutions of a differential equation appearing in QCDJan 25 1996We establish the asymptotic behaviour of the ratio $h^\prime(0)/h(0)$ for $\lambda\rightarrow\infty$, where $h(r)$ is a solution, vanishing at infinity, of the differential equation $h^{\prime\prime}(r) = i\lambda \omega (r) h(r)$ on the domain $0 \leq ... More
Applying a new method to the 2-d Ising transitionMar 12 2013Apr 23 2013The Ising ferromagnetic model on a square lattice is revisited using the Galam Unifying Frame (GUF), set to investigate the dynamics of two-state variable systems within the frame of opinion dynamics. When combined with Metropolis dynamics, an unexpected ... More
DIMSpan - Transactional Frequent Subgraph Mining with Distributed In-Memory Dataflow SystemsMar 06 2017Transactional frequent subgraph mining identifies frequent subgraphs in a collection of graphs. This research problem has wide applicability and increasingly requires higher scalability over single machine solutions to address the needs of Big Data use ... More
Asteroseismic constraints on Asymmetric Dark Matter: Light particles with an effective spin-dependent couplingJan 14 2017So far, direct detection searches have come empty handed in their quest for Dark Matter (DM). Meanwhile, asteroseismology arises as a complementary tool to study DM, as its accumulation in a star can enhance energy transport, by providing a conduction ... More
On the editing distance of graphsJun 19 2006May 21 2016An edge-operation on a graph $G$ is defined to be either the deletion of an existing edge or the addition of a nonexisting edge. Given a family of graphs $\mathcal{G}$, the editing distance from $G$ to $\mathcal{G}$ is the smallest number of edge-operations ... More
Monadic Datalog Containment on TreesApr 02 2014We show that the query containment problem for monadic datalog on finite unranked labeled trees can be solved in 2-fold exponential time when (a) considering unordered trees using the axes child and descendant, and when (b) considering ordered trees using ... More
The building up of individual inflexibility in opinion dynamicsAug 16 2012Two models of opinion dynamics are entangled in order to build a more realistic model of inflexibility. The first one is the Galam Unifying Frame (GUF), which incorporates rational and inflexible agents, and the other one considers the combination of ... More
Andromeda XXVIII: A Dwarf Galaxy More Than 350 kpc from AndromedaOct 26 2011We report the discovery of a new dwarf galaxy, Andromeda XXVIII, using data from the recently-released SDSS DR8. The galaxy is a likely satellite of Andromeda, and, at a separation of $365^{+17}_{-1}$ kpc, would be one of the most distant of Andromeda's ... More
Characterizing interstellar filaments with Herschel in IC5146Mar 01 2011We provide a first look at the results of the Herschel Gould Belt survey toward the IC5146 molecular cloud and present a preliminary analysis of the filamentary structure in this region. The column density map, derived from our 70-500 micron Herschel ... More
Andromeda XXIX: A New Dwarf Spheroidal Galaxy 200kpc from AndromedaOct 26 2011We report the discovery of a new dwarf galaxy, Andromeda XXIX, using data from the recently-released Sloan Digital Sky Survey DR8, and confirmed by Gemini North telescope Multi-Object Spectrograph imaging data. And XXIX appears to be a dwarf spheroidal ... More
The earliest phases of high-mass star formation, as seen in NGC 6334 by \emph{Herschel}Mar 28 2017To constrain models of high-mass star formation, the Herschel/HOBYS KP aims at discovering massive dense cores (MDCs) able to host the high-mass analogs of low-mass prestellar cores, which have been searched for over the past decade. We here focus on ... More
Spontaneous self-ordered states of vortex-antivortex pairs in a Polariton CondensateFeb 12 2013Polariton condensates have proved to be model systems to investigate topological defects, as they allow for direct and non-destructive imaging of the condensate complex order parameter. The fundamental topological excitations of such systems are quantized ... More
Breathing FIRE: How Stellar Feedback Drives Radial Migration, Rapid Size Fluctuations, and Population Gradients in Low-Mass GalaxiesDec 03 2015Mar 30 2016We examine the effects of stellar feedback and bursty star formation on low-mass galaxies ($M_{\rm star}=2\times10^6-5\times10^{10}{\rm M_{\odot}}$) using the FIRE (Feedback in Realistic Environments) simulations. While previous studies emphasized the ... More
Temporally resolved second-order photon correlations of exciton-polariton Bose-Einstein condensate formationOct 26 2015Dec 04 2015Second-order time correlation measurements with a temporal resolution better than 3 ps were performed on a CdTe microcavity where spontaneous Bose-Einstein condensation is observed. After the laser pulse, the nonresonantly excited thermal polariton population ... More
Herschel view of the Taurus B211/3 filament and striations: Evidence of filamentary growth?Nov 27 2012We present first results from the Herschel Gould Belt survey for the B211/L1495 region in the Taurus molecular cloud. Thanks to their high sensitivity and dynamic range, the Herschel images reveal the structure of the dense, star-forming filament B211 ... More
The effects of rounding errors in the nodes on barycentric interpolationSep 30 2013Mar 21 2016We analyze the effects of rounding errors in the nodes on barycentric interpolation. These errors are particularly relevant for the first barycentric formula with the Chebyshev points of the second kind. Here, we propose a method for reducing them.
Cluster-formation in the Rosette molecular cloud at the junctions of filamentsMar 29 2012For many years feedback processes generated by OB-stars in molecular clouds, including expanding ionization fronts, stellar winds, or UV-radiation, have been proposed to trigger subsequent star formation. However, hydrodynamic models including radiation ... More
How to Directly Measure Floquet Topological Invariants in Optical LatticesDec 11 2018The classification of topological Floquet systems with time-periodic Hamiltonians transcends that of static systems. For example, spinless fermions in periodically driven two-dimensional lattices are not completely characterized by the Chern numbers of ... More
Temperature predictions for dust embedded AGB stars: how far can we go with synthetic near-infrared photometry ?Oct 23 2001We discuss the possibilities of the BaSeL models in its lowest temperature boundary (Teff ~ 2500 K for cool giants) to provide the Teff of AGB stars. We present the first step of our work, by comparing our predictions for the AGB star R Fornacis with ... More
No one-loop gauge anomalies for a Lorentz-violating quantum electrodynamics: Evaluation of the three-photon vertexAug 22 2013Identification of the diagrams that can lead to gauge anomalies in the (minimal) Lorentz- and $CPT$-violating extension of quantum electrodynamics reveals these are the electron self-energy and vertex correction (related to the Ward-Takahashi identity), ... More
Finite one-loop radiative corrections in the Lorentz- and CPT-violating QED extensionJul 19 2013We report on our current progress in the study of finite one-loop radiative corrections in the minimal Lorentz- and CPT-violating QED extension.
LIBOR troubles: anomalous movements detection based on Maximum EntropyAug 19 2015According to the definition of the London Interbank Offered Rate (LIBOR), contributing banks should give fair estimates of their own borrowing costs in the interbank market. Between 2007 and 2009, several banks made inappropriate submissions of LIBOR, ... More
An Owner's Guide to Smoothed Particle HydrodynamicsOct 13 1993We present a practical guide to Smoothed Particle Hydrodynamics (\SPH) and its application to astrophysical problems. Although remarkably robust, \SPH\ must be used with care if the results are to be meaningful since the accuracy of \SPH\ is sensitive ... More
Floquet engineering of optical solenoids and quantized charge pumping along tailored paths in two-dimensional Chern insulatorsFeb 19 2018Apr 17 2018The insertion of a local magnetic flux, as the one created by a thin solenoid, plays an important role in gedanken experiments of quantum Hall physics. By combining Floquet engineering of artificial magnetic fields with the ability of single-site addressing ... More
Overview of Constrained PARAFAC ModelsMay 29 2014Jul 29 2014In this paper, we present an overview of constrained PARAFAC models where the constraints model linear dependencies among columns of the factor matrices of the tensor decomposition, or alternatively, the pattern of interactions between different modes ... More
Reliable computation from contextual correlationsJun 29 2017Aug 14 2017An operational approach to the study of computation based on correlations considers black-boxes with one-bit inputs and outputs, controlled by a limited classical computer capable only of performing sums modulo-2. In this setting, it was shown that non-contextual ... More
Survey on Automated Machine LearningApr 26 2019Machine learning has become a vital part in many aspects of our daily life. However, building well performing machine learning applications requires highly specialized data scientists and domain experts. Automated machine learning (AutoML) aims to reduce ... More
The effects of k-dependent self-energy in the electronic structure of correlated materialsOct 01 2012It is known from self-energy calculations in the electron gas and sp materials based on the GW approximation that a typical quasiparticle renormalization factor (Z factor) is approximately 0.7-0.8. Band narrowing in electron gas at rs = 4 due to correlation ... More
Brownian motion on the Sierpinski carpetDec 09 2008Aug 31 2009We prove that, up to scalar multiples, there exists only one local regular Dirichlet form on a generalized Sierpinski carpet that is invariant with respect to the local symmetries of the carpet. Consequently for each such fractal the law of Brownian motion ... More
L-Recursion and a new Logic for Logarithmic SpaceDec 28 2012Mar 18 2013We extend first-order logic with counting by a new operator that allows it to formalise a limited form of recursion which can be evaluated in logarithmic space. The resulting logic LREC has a data complexity in LOGSPACE, and it defines LOGSPACE-complete ... More
Kilohertz-driven Bose-Einstein condensates in optical latticesMar 06 2012Mar 08 2012We analyze time-of-flight absorption images obtained with dilute Bose-Einstein con-densates released from shaken optical lattices, both theoretically and experimentally. We argue that weakly interacting, ultracold quantum gases in kilohertz-driven optical ... More
Beyond traditional coatings, a review on thermal sprayed functional and smart coatingsNov 13 2018Thermal spraying has been present for over a century, being greatly refined and optimised during this time, becoming nowadays a reliable and cost-efficient method to deposit thick coatings with a wide variety of feedstock materials and substrates. Thermal ... More
The Herschel view of massive star formation in G035.39--00.33: Dense and cold filament of W48 undergoing a mini-starburstSep 16 2011Oct 17 2011The filament IRDC G035.39--00.33 in the W48 molecular complex is one of the darkest infrared clouds observed by \textit{Spitzer}. It has been observed by the PACS (70 and 160\,$\micron$) and SPIRE (250, 350, and 500\,$\micron$) cameras of the \textit{Herschel} ... More
The most massive stars in the Arches clusterNov 05 2007We study a sample composed of 28 of the brightest stars in the Arches cluster. We analyze K-band spectra obtained with the integral field spectrograph SINFONI on the VLT. Atmosphere models computed with the code CMFGEN are used to derive the effective ... More
A polarised infrared flare from Sagittarius A* and the signatures of orbiting plasma hotspotsNov 23 2006In this article we summarise and discuss the infrared, radio, and X-ray emission from the supermassive black hole in the Galactic Centre, SgrA*. We include new results from near-infrared polarimetric imaging observations obtained on May 31st, 2006. In ... More
Maintenance of order in a moving strong condensateJul 07 2014Oct 16 2014We investigate the conditions under which a moving condensate may exist in a driven mass transport system. Our paradigm is a minimal mass transport model in which $n-1$ particles move simultaneously from a site containing $n>1$ particles to the neighbouring ... More
Monitoring stellar orbits around the Massive Black Hole in the Galactic CenterOct 26 2008We present the results of 16 years of monitoring stellar orbits around the massive black hole in center of the Milky Way using high resolution NIR techniques. This work refines our previous analysis mainly by greatly improving the definition of the coordinate ... More
Feature extraction from complex networks: A case of study in genomic sequences classificationDec 17 2014This work presents a new approach for classification of genomic sequences from measurements of complex networks and information theory. For this, it is considered the nucleotides, dinucleotides and trinucleotides of a genomic sequence. For each of them, ... More
Max Noether's Theorem for Integral CurvesMar 17 2014We generalize, for integral curves, a celebrated result of Max Noether on global sections of the n-dualizing sheaf of a smooth nonhyperelliptic curve. This is our main result. We also obtain an embedding of a non-Gorenstein curve in a way that we can ... More
Polarizability measurements in a molecule near-field interferometerJan 25 2007We apply near-field matter-wave interferometry to determine the absolute scalar polarizability of the fullerenes C$_{60}$ and C$_{70}$. A key feature of our experiment is the combination of good transmission and high spatial resolution, gained by wide ... More
An upper bound on the total inelastic cross-section as a function of the total cross-sectionNov 05 2010Mar 08 2011Recently Andr\'e Martin has proved a rigorous upper bound on the inelastic cross-section $\sigma_{inel}$ at high energy which is one-fourth of the known Froissart-Martin-Lukaszuk upper bound on $\sigma_{tot}$. Here we obtain an upper bound on $\sigma_{inel}$ ... More
UV, optical and near-IR diagnostics of massive starsOct 26 2010We present an overview of a few spectroscopic diagnostics of massive stars. We explore the following wavelength ranges: UV (1000 to 2000 A), optical (4000--7000 A) and near-infrared (mainly H and K bands). The diagnostics we highlight are available in ... More
A framework for deflated and augmented Krylov subspace methodsJun 07 2012Feb 01 2013We consider deflation and augmentation techniques for accelerating the convergence of Krylov subspace methods for the solution of nonsingular linear algebraic systems. Despite some formal similarity, the two techniques are conceptually different from ... More
GRADOOP: Scalable Graph Data Management and Analytics with HadoopJun 01 2015Jun 02 2015Many Big Data applications in business and science require the management and analysis of huge amounts of graph data. Previous approaches for graph analytics such as graph databases and parallel graph processing systems (e.g., Pregel) either lack sufficient ... More
On Minimizing Crossings in Storyline VisualizationsSep 01 2015In a storyline visualization, we visualize a collection of interacting characters (e.g., in a movie, play, etc.) by $x$-monotone curves that converge for each interaction, and diverge otherwise. Given a storyline with $n$ characters, we show tight lower ... More
Grand Challenge: Real-time Destination and ETA Prediction for Maritime TrafficOct 12 2018In this paper, we present our approach for solving the DEBS Grand Challenge 2018. The challenge asks to provide a prediction for (i) a destination and the (ii) arrival time of ships in a streaming-fashion using Geo-spatial data in the maritime context. ... More
Beyond traditional coatings, a review on thermal sprayed functional and smart coatingsNov 13 2018Mar 25 2019Thermal spraying has been present for over a century, being greatly refined and optimised during this time, becoming nowadays a reliable and cost-efficient method to deposit thick coatings with a wide variety of feedstock materials and substrates. Thermal ... More
Fermionic Superfluidity with Imbalanced Spin Populations and the Quantum Phase Transition to the Normal StateNov 08 2005Whether it occurs in superconductors, helium-3 or inside a neutron star, fermionic superfluidity requires pairing of fermions, particles with half-integer spin. For an equal mixture of two states of fermions ("spin up" and "spin down"), pairing can be ... More
On static chiral Milton-Briane-Willis continuum mechanicsJan 07 2019Recent static experiments on twist effects in chiral three-dimensional mechanical metamaterials have been discussed in the context of micropolar Eringen continuum mechanics, which is a generalization of Cauchy elasticity. For cubic symmetry, Eringen elasticity ... More
Physical properties of the Sh2-104 HII region as seen by HerschelMay 17 2010Context: Sh2-104 is a Galactic H ii region with a bubble morphology, detected at optical and radio wavelengths. It is considered the first observational confirmation of the collect-and-collapse model of triggered star-formation. Aims: We aim to analyze ... More
On the deuterium abundance and the importance of stellar mass loss in the interstellar and intergalactic mediumApr 26 2017Mar 01 2018We quantify the gas-phase abundance of deuterium and fractional contribution of stellar mass loss to the gas in cosmological zoom-in simulations from the Feedback In Realistic Environments project. At low metallicity, our simulations confirm that the ... More