total 157309took 0.19s

The use of blogs in the education field: A qualitative systematic reviewOct 12 2018Blogs have become one of the most successful tools of the Web 2.0 because of their ease of use and the availability of open platforms. They have quickly spread in the education field thanks to the many attractive qualities that have been attributed to ... More

2D-Oide effectSep 18 2015The Oide effect considers the synchrotron radiation in the final focusing quadrupole and it sets a lower limit on the vertical beam size at the Interaction Point, particularly relevant for high energy linear colliders. The theory of the Oide effect was ... More

Observable effects of Interplanetary Coronal Mass Ejections on ground level neutron monitor counting ratesFeb 11 2013In this work, non-recurrent Forbush decreases (FDs) triggered by the passage of shock-driven interplanetary coronal mass ejections (ICMEs) have been analyzed. Fifty-nine ICMEs have been studied but only the 25% of them were associated to a FD. We find ... More

Positron driven muon source for a muon colliderMay 14 2019The design of a future multi-TeV muon collider needs new ideas to overcome the technological challenges related to muon production, cooling, accumulation and acceleration. In this paper a layout of a positron driven muon source known as the Low EMittance ... More

Low emittance muon accelerator studies with production from positrons on targetMar 18 2018Jun 12 2018A new scheme to produce very low emittance muon beams using a positron beam of about 45~GeV interacting on electrons on target is presented. One of the innovative topics to be investigated is the behaviour of the positron beam stored in a low emittance ... More

Towards Noncommutative Linking Numbers Via the Seiberg-Witten MapMay 15 2015Sep 22 2015In the present work some geometric and topological implications of noncommutative Wilson loops are explored via the Seiberg-Witten map. In the abelian Chern-Simons theory on a three dimensional manifold, it is shown that the effect of noncommutativity ... More

Invariant metrics on central extensions of Quadratic Lie algebrasJan 09 2018A quadratic Lie algebra is a Lie algebra endowed with a symmetric, invariant and non degenerate bilinear form; such a bilinear form is called an invariant metric. The aim of this work is to describe the general structure of those central extensions of ... More

On 3-dimensional complex Hom-Lie algebrasFeb 22 2019In this paper, we study and classify the 3-dimensional Hom-Lie algebras over C. We provide first a complete set of representatives for the isomorphism classes of skew-symmetric bilinear products defined on a 3-dimensional complex vector space g. The well ... More

Invariant metrics on central extensions of Quadratic Lie algebrasJan 09 2018Mar 27 2019A quadratic Lie algebra is a Lie algebra endowed with a symmetric, invariant and non degenerate bilinear form; such a bilinear form is called an invariant metric. The aim of this work is to describe the general structure of those central extensions of ... More

On 3-dimensional complex Hom-Lie algebrasFeb 22 2019Feb 26 2019In this paper, we study and classify the 3-dimensional Hom-Lie algebras over C. We provide first a complete set of representatives for the isomorphism classes of skew-symmetric bilinear products defined on a 3-dimensional complex vector space g. The well ... More

The Fabra-ROA Baker-Nunn Camera at Observatori Astronòmic del Montsec: a wide-field imaging facility for exoplanet transit detectionDec 04 2009A number of Baker-Nunn Camera (BNC) were manufactured by Smithsonian Institution during the 60s as optical tracking systems for artificial satellites with optimal optical and mechanical specifications. One of them was installed at the Real Instituto y ... More

Discovery of a Metal-Poor Field Giant with a Globular Cluster Second-Generation Abundance PatternApr 05 2016Oct 06 2016We report on detection, from observations obtained with the APOGEE spectroscopic survey, of a metal-poor ([Fe/H] $= -1.3$ dex) field giant star with an extreme Mg-Al abundance ratio ([Mg/Fe] $= -0.31$ dex; [Al/Fe] $= 1.49$ dex). Such low Mg/Al ratios ... More

Semigroup-theoretical characterizations of arithmetical invariants with applications to numerical monoids and Krull monoidsJun 22 2010Arithmetical invariants---such as sets of lengths, catenary and tame degrees---describe the non-uniqueness of factorizations in atomic monoids. We study these arithmetical invariants by the monoid of relations and by presentations of the involved monoids. ... More

The second release of the Toruń catalogue of Galactic post-AGB objects: new classification schemeOct 18 2011Sep 13 2012The investigation of post-AGB objects (proto-planetary nebulae) is very important from the standpoint of physical and chemical changes occurring during the late stages of stellar evolution. The Toru\'n catalogue of Galactic post-AGB and related objects ... More

FliPer: Classifying TESS pulsating starsNov 29 2018The recently launched NASA Transiting Exoplanet Survey Satellite (TESS) mission is going to collect lightcurves for a few hundred million of stars and we expect to increase the number of pulsating stars to analyze compared to the few thousand stars observed ... More

Dynamics of Knowledge in DeLP through Argument Theory ChangeNov 29 2011This article is devoted to the study of methods to change defeasible logic programs (de.l.p.s) which are the knowledge bases used by the Defeasible Logic Programming (DeLP) interpreter. DeLP is an argumentation formalism that allows to reason over potentially ... More

Two localization lengths in the Anderson transition on random graphsApr 18 2019We present a full description of the nonergodic properties of wavefunctions on random graphs without boundary in the localized and critical regimes of the Anderson transition. We find that they are characterized by two localization lengths: the largest ... More

New spaces of matrices with operator entriesOct 17 2018In this paper, we will consider matrices with entries in the space of operators $\mathcal{B}(H)$, where $H$ is a separable Hilbert space and consider the class of matrices that can be approached in the operator norm by matrices with a finite number of ... More

A class of Schur multipliers of matrices with operator entriesOct 17 2018In this paper, we will consider matrices with entries in the space of operators $\mathcal{B}(H)$, where $H$ is a separable Hilbert space, and consider the class of (left or right) Schur multipliers that can be approached in the multiplier norm by matrices ... More

Multifractality of quantum wave functions in the presence of perturbationsJun 18 2015We present a comprehensive study of the destruction of quantum multifractality in the presence of perturbations. We study diverse representative models displaying multifractality, including a pseudointegrable system, the Anderson model and a random matrix ... More

Two scenarios for quantum multifractality breakdownFeb 07 2014Jun 13 2014We expose two scenarios for the breakdown of quantum multifractality under the effect of perturbations. In the first scenario, multifractality survives below a certain scale of the quantum fluctuations. In the other one, the fluctuations of the wave functions ... More

Schur product with operator-valued entriesApr 10 2018In this paper we characterize Toeplitz matrices with entries in the space of bounded operators on Hilbert spaces $\mathcal{B}(H)$ which define bounded operators acting on $\ell^2(H)$ and use it to get the description of the right Schur multipliers acting ... More

Time in classical and quantum mechanicsJul 12 2017Sep 20 2018In this article we study the nature of time in Mechanics. The fundamental principle, according to which a mechanical system evolves governed by a second order differential equation, implies the existence of an absolute time-duration in the sense of Newton. ... More

On the quantization of mechanical systemsJan 16 2017Mar 27 2017We present a canonical way of assigning to each magnitude of a classical mechanical system a differential operator in the configuration space, thus rigorously establishing the Correspondence Principle for such systems. Here we show how each classical ... More

Redshift for massive particlesJun 22 2018On each FRW metric, there exist a redshift for massive particles, analogous to that of photons, but depending on the mass. This is a simple consequence of the fundamental laws of Classical Mechanics.

Engineering Fragile Topology in Photonic Crystals: Topological Quantum Chemistry of LightMar 06 2019In this Letter, we apply the recently developed theory of "Topological quantum chemistry" to the study of band structures in photonic crystals. We focus on a family of crystals formed by elliptical rods in a triangular lattice. We show that the symmetry ... More

Ultraintense femtosecond magnetic nanoprobes induced by azimuthally polarized laser beamsOct 16 2018We report a novel scheme to generate laser-induced, ultrafast, intense (Tesla scale), spatially isolated, magnetic fields. Three-dimensional particle-in-cell simulations show that a femtosecond azimuthally-polarized infrared vector beam, aimed to a conducting ... More

Extensions of $\frak{sl}_2$ by generalized derivations and Hom-Lie algebra structures on simple Lie algebrasMar 08 2019Mar 13 2019The purpose of this paper is to show that there are Hom-Lie algebra structures on $\mathfrak{sl}_2(\mathbb{F}) \oplus \mathbb{F}D$, where $D$ is a special type of generalized derivation of $\mathfrak{sl}_2(\mathbb{F})$, and $\mathbb{F}$ is an algebraically ... More

A spectroscopic survey of thick disc stars outside the solar neighbourhoodOct 24 2011We performed a spectroscopic survey of nearly 700 stars probing the galactic thick disc far from the solar neighbourhood towards the galactic coordinates (l~277, b~47). The derived effective temperatures, surface gravities and overall metallicities were ... More

Extensions of $\frak{sl}_2$ by generalized derivations and Hom-Lie algebra structures on simple Lie algebrasMar 08 2019The purpose of this paper is to show that there are Hom-Lie algebras structures on $\mathfrak{sl}_2(\mathbb{F}) \oplus \mathbb{F}D$, where $D$ is an special type of generalized derivation of $\mathfrak{sl}_2(\mathbb{F})$, and $\mathbb{F}$ is an algebraically ... More

Percolation in photonic crystals revealed by Fano ResonanceJul 29 2016The understanding of how the arrangement of defects in photonic crystals impacts its photonic properties is cru-cial for the design of functional materials based thereon. By preparing photonic crystals with random missing scatterers we create crystals ... More

Phase matching effects in high harmonic generation at the nanometer scaleDec 27 2016Jun 02 2017Plasmon resonances are known to amplify the electromagnetic fields near metallic nanostructures. Therefore, they are considered to provide a promising scheme to generate extreme-ultraviolet harmonics, using low power drivings. During high-order harmonic ... More

Second-order symmetric Lorentzian manifolds II: structure and global propertiesJan 18 2011We give a summary of recent results on the explicit local form of the second-order symmetric Lorentzian manifolds in arbitrary dimension, and its global version. These spacetimes turn out to be essentially a specific subclass of plane waves.

Complete classification of second-order symmetric spacetimesJan 20 2010As a difference with the positive-definite Riemannian case, in the Lorentzian case there exists proper second-order symmetric spacetimes, i.e., those with vanishing second covariant derivative of the Riemannian tensor ($R_{\lambda\mu\nu\rho;\alpha;\beta}=0$) ... More

Stingray: A Modern Python Library For Spectral TimingJan 23 2019This paper describes the design and implementation of stingray, a library in Python built to perform time series analysis and related tasks on astronomical light curves. Its core functionality comprises a range of Fourier analysis techniques commonly ... More

Comparison of 1D and 3D Models for the Estimation of Fractional Flow ReserveMay 29 2018In this work we propose to validate the predictive capabilities of one-dimensional (1D) blood flow models with full three-dimensional (3D) models in the context of patient-specific coronary hemodynamics in hyperemic conditions. Such conditions mimic the ... More

On the energy deposition by electrons in air and the accurate determination of the air-fluorescence yieldJul 12 2012The uncertainty in the absolute value of the air-fluorescence yield still puts a severe limit on the accuracy in the primary energy of ultra-high-energy cosmic rays. The precise measurement of this parameter in laboratory is in turn conditioned by a careful ... More

Extensions of linear regression models based on set arithmetic for interval dataOct 22 2012Extensions of previous linear regression models for interval data are presented. A more flexible simple linear model is formalized. The new model may express cross-relationships between mid-points and spreads of the interval data in a unique equation ... More

Deep Learning-Based Multiple Object Visual Tracking on Embedded System for IoT and Mobile Edge Computing ApplicationsJul 31 2018Compute and memory demands of state-of-the-art deep learning methods are still a shortcoming that must be addressed to make them useful at IoT end-nodes. In particular, recent results depict a hopeful prospect for image processing using Convolutional ... More

FliPer$_{Class}$: In search of solar-like pulsators among TESS targetsFeb 26 2019The NASA's Transiting Exoplanet Survey Satellite (TESS) is about to provide full-frame images of almost the entire sky. The amount of stellar data to be analysed represents hundreds of millions stars, which is several orders of magnitude above the amount ... More

FliPer: A global measure of power density to estimate surface gravities of main-sequence Solar-like stars and red giantsSep 13 2018Asteroseismology provides global stellar parameters such as masses, radii or surface gravities using the mean global seismic parameters as well as the effective temperature for thousands of low-mass stars $(0.8 M_\odot <M<3 M_\odot)$. This methodology ... More

Structure of second-order symmetric Lorentzian manifoldsJan 28 2011Jul 06 2011Second-order symmetric Lorentzian spaces, that is to say, Lorentzian manifolds with vanishing second derivative of the curvature tensor R, are characterized by several geometric properties, and explicitly presented. Locally, they are a product M=M_1 x ... More

FliPer$_{Class}$: In search of solar-like pulsators among TESS targetsFeb 26 2019Mar 07 2019The NASA's Transiting Exoplanet Survey Satellite (TESS) is about to provide full-frame images of almost the entire sky. The amount of stellar data to be analysed represents hundreds of millions stars, which is several orders of magnitude above the amount ... More

A new method to measure the CP violating angle gamma using B^\pm -> pi^\pm pi^+ pi^- and B^\pm -> K^\pm pi^+ pi^- decaysJul 11 2000Feb 28 2001A new and simple procedure to measure the angle $\gamma$ from $B^{\pm} \to \pi^{\pm}\pi^+\pi^-$ and $B^{\pm} \to K^{\pm}\pi^+\pi^-$ decays using SU(3) symmetry is presented. It is based on a full Dalitz plot analysis of these decays. All diagrams, including ... More

Non-stationary Robust Transmission Expansion PlanningOct 11 2015May 15 2016Recent breakthroughs in Transmission Network Expansion Planning (TNEP) have demonstrated that the use of robust optimization, as opposed to stochastic programming methods, renders the expansion planning problem computationally tractable for real systems. ... More

Positron driven muon source for a muon colliderMay 14 2019May 19 2019The design of a future multi-TeV muon collider needs new ideas to overcome the technological challenges related to muon production, cooling, accumulation and acceleration. In this paper a layout of a positron driven muon source known as the Low EMittance ... More

Dynamic Robust Transmission Expansion PlanningOct 11 2015Jan 30 2017Recent breakthroughs in Transmission Network Expansion Planning (TNEP) have demonstrated that the use of robust optimization, as opposed to stochastic programming methods, renders the expansion planning problem considering uncertainties computationally ... More

Procedure for direct measurement of the Cabibbo-Kobayashi-Maskawa angle $γ$Apr 03 1998Nov 07 1998A natural procedure is presented to measure the angle $\gamma$ from the decay $B^{\pm} \to \pi^{\pm}\pi^+\pi^-$. It is based in the Dalitz plot fitting analysis. Neither amplitudes nor strong phases have to be known a priori. We present simulations of ... More

Limb imaging of the Venus O2 visible nightglow with the Venus Monitoring CameraJul 14 2013We investigated the Venus O2 visible nightglow with imagery from the Venus Monitoring Camera on Venus Express. Drawing from data collected between April 2007 and January 2011, we study the global distribution of this emission, discovered in the late 70s ... More

BaTMAn: Bayesian Technique for Multi-image AnalysisJul 25 2016Dec 19 2016This paper describes the Bayesian Technique for Multi-image Analysis (BaTMAn), a novel image-segmentation technique based on Bayesian statistics that characterizes any astronomical dataset containing spatial information and performs a tessellation based ... More

Outdoor Field Experience with Autonomous RPC Based StationsJun 10 2016Aug 30 2016In the last two decades Resistive Plate Chambers were employed in the Cosmic Ray Experiments COVER-PLASTEX and ARGO/YBJ. In both experiments the detectors were housed indoors, likely owing to gas distribution requirements and the need to control environment ... More

Abundance anomalies in hot horizontal branch stars of the galactic globular cluster NGC 1904Jan 16 2005We present abundance measurements, based on high-resolution optical spectroscopic data obtained with the Ultraviolet and Visual Echelle Spectrograph mounted on Kueyen (Very Large Telescope UT2), for ten stars in the extended blue horizontal branch of ... More

BaTMAn: Bayesian Technique for Multi-image AnalysisJul 25 2016This paper describes the Bayesian Technique for Multi-image Analysis (BaTMAn), a novel image segmentation technique based on Bayesian statistics, whose main purpose is to characterize an astronomical dataset containing spatial information and perform ... More

On metastable configurations of small-world networksOct 18 2005We calculate the number of metastable configurations of Ising small-world networks which are constructed upon superimposing sparse Poisson random graphs onto a one-dimensional chain. Our solution is based on replicated transfer-matrix techniques. We examine ... More

Cusp Anomalous dimension and rotating open strings in AdS/CFTJul 18 2016In the context of AdS/CFT we provide analytical support for the proposed duality between a Wilson loop with a cusp, the cusp anomalous dimension, and the meson model constructed from a rotating open string with high angular momentum. This duality was ... More

Cusp Anomalous dimension and rotating open strings in AdS/CFTJul 18 2016Jan 08 2018In the context of AdS/CFT we provide analytical support for the proposed duality between a Wilson loop with a cusp, the cusp anomalous dimension, and the meson model constructed from a rotating open string with high angular momentum. This duality was ... More

On the backwards difference filterNov 07 2007It is usual in helioseismology to remove unwanted instrumental low-frequency trends by applying high-pass filters to the time series. However, the choice of the filter is very important because it can keep the periodic signals throughout the spectrum. ... More

Non-ergodic states induced by impurity levels in quantum spin chainsMar 08 2018The semi-infinite XY spin chain with an impurity at the boundary has been chosen as a prototype of interacting many-body systems to test for non-ergodic behavior. The model is exactly solvable in analytic way in the thermodynamic limit, where energy eigenstates ... More

Preparation of non-ergodic states in quantum spin chainsMar 09 2017We test the time evolution of quite general initial states in a model that is exactly solvable, $i.e.$ a semi-infinite $XY$ spin chain with an impurity at the boundary. The dynamics is portrayed through the observation of the site magnetization along ... More

High Energy Cosmic Rays from NeutrinosFeb 18 1999Apr 03 2000We discuss recent models in which neutrinos, which are assumed to have mass in the eV range, originate the highest energy cosmic rays by interaction with the enhanced density in the galactic halo of the relic cosmic neutrino background. We make an analytical ... More

Limits on Topological Defect Neutrino fluxes from Horizontal Air Shower measurementsNov 30 1996We obtain the horizontal air shower rate from the (EeV) high energy neutrino flux predicted in some topological defect scenarios as the source for the highest energy cosmic rays. Emphasis is made on the different character of the events depending on the ... More

A boundary-based net-exchange Monte Carlo method for absorbing and scattering thick mediaFeb 21 2019A boundary-based net-exchange Monte Carlo method was introduced in [1] that allows to bypass the difficulties encountered by standard Monte Carlo algorithms in the limit of optically thick absorption (and/or for quasi-isothermal configurations). With ... More

Spectral line survey of the ultracompact HII region Mon R2Mar 29 2012Ultracompact (UC) HII regions constitute one of the earliest phases in the formation of a massive star and are characterized by extreme physical conditions (Go>10^5 Habing field and n>10^6 cm^-3). The UC HII Mon R2 is the closest one and therefore an ... More

Deuteration around the ultracompact HII region Mon R2Jun 05 2014The massive star-forming region Mon R2 hosts the closest ultra-compact HII region that can be spatially resolved with current single-dish telescopes. We used the IRAM-30m telescope to carry out an unbiased spectral survey toward two important positions ... More

Fluorine Abundances in Galactic AGB StarsApr 26 2010An analysis of the fluorine abundance in Galactic AGB carbon stars (24 N-type, 5 SC-type and 5 J-type) is presented. This study uses the state- of-the-art carbon rich atmosphere models and improved atomic and molecular line lists in the 2.3 {\mu}m region. ... More

Emerging archetypes in massive artificial societies for literary purposes using genetic algorithmsMar 12 2014The creation of fictional stories is a very complex task that usually implies a creative process where the author has to combine characters, conflicts and plots to create an engaging narrative. This work presents a simulated environment with hundreds ... More

Brown representability for exterior cohomology and cohomology with compact supportsMar 26 2014It is well known that cohomology with compact supports is not a homotopy invariant but only a proper homotopy one. However, as the proper category lacks of general categorical properties, a Brown representability theorem type does not seem reachable. ... More

Educational cosmic ray experiments with Geiger countersDec 31 2006Experiments concerning the physics of cosmic rays offer to high-school teachers and students a relatively easy approach to the field of research in high energy physics. The detection of cosmic rays does not necessarily require the use of sophisticated ... More

Spatial distribution of small hydrocarbons in the neighborhood of the Ultra Compact HII region Monoceros R2Mar 20 2013We study the chemistry of small hydrocarbons in the photon-dominated regions (PDRs) associated with the ultra-compact HII region Mon R2. Our goal is to determine the variations of the abundance of small hydrocarbons in a high-UV irradiated PDR and investigate ... More

Long term variability of Cygnus X-1: VII. Orbital variability of the focussed wind in Cyg X-1 / HDE 226868 systemFeb 25 2015Binary systems with an accreting compact object are a unique chance to investigate the strong, clumpy, line-driven winds of early type supergiants by using the compact object's X-rays to probe the wind structure. We analyze the two-component wind of HDE ... More

New evolutionary sequences for hot H-deficient white dwarfs on the basis of a full account of progenitor evolutionSep 14 2009We present full evolutionary calculations appropriate for the study of hot hydrogen-deficent DO white dwarfs, PG 1159 stars, and DB white dwarfs. White dwarf sequences are computed for a wide range of stellar masses and helium envelopes on the basis of ... More

Fluorine in AGB Carbon Stars RevisitedDec 16 2008A reanalysis of the fluorine abundance in three Galactic AGB carbon stars (TX Psc, AQ Sgr and R Scl) has been performed from the molecular HF (1-0) R9 line at 2.3358 $\mu$m. High-resolution (R$\sim 50000$) and high signal to noise spectra obtained with ... More

Quantum information measures and their applications in quantum field theoryFeb 23 2017In the last decades, it has been understood that a wide variety of phenomena in quantum field theory (QFT) can be characterised using quantum information measures, such as the entanglement entropy of a state and the relative entropy between quantum states ... More

An approach to plane algebroid branchesAug 04 2012Our aim is to reprove the basic results of the theory of branches of plane algebraic curves over algebraically closed fields of arbitrary characteristic. We do not use the Hamburger-Noether expansions. Our basic tool is the logarithmic distance on the ... More

A discriminant criterion of irreducibilityNov 19 2009In this paper we give a criterion of irreducibility for a complex power series in two variables, using the notion of jacobian Newton diagrams, defined with respect to any direction. Moreover we study the singularity at infinity of a plane affine curve ... More

Noether Identities, $β$-functions and symmetries in DFTMay 22 2019May 30 2019Given the $\beta$ functions of the closed string sigma model up to one loop in $\alpha'$, the effective action implement the condition $\beta=0$ to preserve conformal symmetry at quantum level. One of the more powerful and striking results of string theory ... More

Accuracy of the numerical computation of solar g-modesMar 26 2010From the recent work of the Evolution and Seismic Tools Activity (ESTA, Monteiro et al. 2006; Lebreton et al. 2008), whose Task 2 is devoted to compare pulsational frequencies computed using most of the pulsational codes available in the asteroseismic ... More

Stealth acoustic materialsApr 25 2019Apr 26 2019We report the experimental design of a 1D stealth acoustic material, namely a material that suppresses the acoustic scattering for a given set of incident wave vectors. The material consists of multiple scatterers, rigid diaphragms, located in an air-filled ... More

Quantitative Stellar Spectral Classification. IV. Application to the Open Cluster IC 2391Sep 24 2008In this work we perform the first test of a stellar spectral classification method (Stock & Stock 1999) by applying it to early type stars. The sample of stars are the members of the open cluster IC 2391 that have high-resolution spectra available in ... More

Optically tunable surfaces with trapped particles in microcavitiesJun 06 2008We introduce optically tunable surfaces based upon metallic gold nanoparticles trapped in open, water-filled gold cavities. The optical properties of the surfaces change dramatically with the presence and location of the particles inside the cavities. ... More

Characterization of jacobian Newton polygons of plane branches and new criteria of irreducibilityMay 28 2008Jun 08 2009In this paper we characterize, in two different ways, the Newton polygons which are jacobian Newton polygons of a branch. These characterizations give in particular combinatorial criteria of irreducibility for complex series in two variables and necessary ... More

Calibrating 15 years of GOLF dataOct 03 2011The GOLF resonant scattering spectrophotometer aboard SoHO has now provided 15 years of continuous high precision Sun-as-a-star radial-velocity measurements. This length of time series provides very high resolution in the frequency domain and is combined ... More

On the Milnor formula in arbitrary characteristicDec 16 2018The Milnor formula $\mu=2\delta-r+1$ relates the Milnor number $\mu$, the double point number $\delta$ and the number $r$ of branches of a plane curve singularity. It holds over the fields of characteristic zero. Melle and Wall based on a result by Deligne ... More

Comparison of charge modulations in La$_{1.875}$Ba$_{0.125}$CuO$_4$ and YBa$_2$Cu$_3$O$_{6.6}$May 23 2013A charge modulation has recently been reported in (Y,Nd)Ba$_2$Cu$_3$O$_{6+x}$ [Ghiringhelli {\em et al.} Science 337, 821 (2013)]. Here we report Cu $L_3$ edge soft x-ray scattering studies comparing the lattice modulation associated with the charge modulation ... More

On the computation of the Omega invariant of a numerical semigroup by optimizing over an efficient integer setJul 19 2010Aug 05 2010In this paper we present a mathematical formulation for the omega invariant of a numerical semigroup for each of its minimal generators. The model consists of solving a problem of optimizing a linear function over the efficient set of a multiobjective ... More

Scarce defects induce anomalous deterministic diffusionMay 05 2016We introduce a simple model of deterministic particles in weakly disordered media which exhibits a transition from normal to anomalous diffusion. The model consists of a set of non-interacting overdamped particles moving on a disordered potential. The ... More

Quasi-ordinary singularities: tree model, discriminant and irreducibilityFeb 24 2014Let $f(Y)\in K[[X_1,\dots,X_d]][Y]$ be a quasi-ordinary Weierstrass polynomial with coefficients in the ring of formal power series over an algebraically closed field of characteristic zero. In this paper we study the discriminant $D_f$ of $f(Y)-V$, where ... More

Shakedown of unbound granular materialApr 07 2004Jun 03 2004Compacted unbound granular materials are extensively used as sub-layer in pavement design. Most pavement design guides assume that they are responsible for the degradation and deformation of the roads and railways that they support. Biaxial tests are ... More

Euclidean algorithm and polynomial equations after LabatieJul 30 2013We recall Labatie's effective method of solving polynomial equations with two unknowns by using the Euclidean algorithm.

Electroproduction ratios of Baryon-Meson states and Strangeness SuppressionJan 26 2016Apr 14 2016We describe the electroproduction ratios of baryon-meson states from nucleon, inferring from the sea quarks in the nucleon using an extension of the quark model that takes into account the sea. As a result we provide, with no adjustable parameters, the ... More

Noether Identities, $β$-functions and symmetries in DFTMay 22 2019Given the $\beta$ functions of the closed string sigma model up to one loop in $\alpha'$, the effective action implement the condition $\beta=0$ to preserve conformal symmetry at quantum level. One of the more powerful and striking results of string theory ... More

The Milnor number of plane irreducible singularities in positive characteristicMay 26 2015Jun 05 2015\noindent Let $\mu(f)$ resp. $c(f)$ be the Milnor number resp. the degree of the conductor of an irreducible power series $f\in \bK[[x,y]]$, where $\bK$ is an algebraically closed field of characteristic $p\geq 0$. It is well-known that $\mu(f)\geq c(f)$. ... More

On the approximate jacobian Newton diagrams of an irreducible plane curveJun 06 2011We introduce the notion of an approximate jacobian Newton diagram which is the jacobian Newton diagram of the morphism $(f^{(k)},f)$, where $f$ is a branch and $f^{(k)}$ is a characteristic approximate root of $f$. We prove that the set of all approximate ... More

Decompositions of the higher order polars of plane branchesFeb 02 2016\noindent In \cite{Casas} Casas-Alvero found decompositions of higher order polars of an irreducible plane curve generalizing the results of Merle. We improve his result giving a finer decomposition where we determine the topological type and the number ... More

Stealth acoustic materialsApr 25 2019We report the experimental design of a 1D stealth acoustic material, namely a material that suppresses the acoustic scattering for a given set of incident wave vectors. The material consists of multiple scatterers, rigid diaphragms, located in an air-filled ... More

A reaction-diffusion model for the progression of Parkinson's diseaseFeb 17 2017The temporal and spatial development of Parkinson's disease has been characterised as the progressive formation of {\alpha}-synuclein aggregations through susceptible neuronal pathways. This article describes a new model for this progression mechanism ... More

Oscillation mode linewidths and heights of 23 main-sequence stars observed by KeplerMar 27 2014Solar-like oscillations have been observed by Kepler and CoRoT in many solar-type stars, thereby providing a way to probe the stars using asteroseismology. We provide the mode linewidths and mode heights of the oscillations of various stars as a function ... More

Desingularization of binomial varieties in arbitrary characteristic. Part I. A new resolution function and their propertiesFeb 17 2009Sep 03 2010This paper is devoted to give all the technical constructions and definitions that will lead to the construction of an algorithm of resolution of singularities for binomial ideals. We construct a resolution function that will provide a resolution of singularities ... More

Irreducible numerical semigroups with multiplicity three and fourApr 11 2011Apr 14 2011In this paper we analyze the irreducibility of numerical semigroups with multiplicity up to four. Our approach uses the notion of Kunz-coordinates vector of a numerical semigroup recently introduced in (Blanco-Puerto, 2011). With this tool we also completely ... More

Ordered p-median problems with neighborhoodsMar 21 2017Oct 23 2017In this paper, we introduce a new variant of the $p$-median facility location problem in which it is assumed that the exact location of the potential facilities is unknown. Instead, each of the facilities must be located in a region around their initially ... More