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Ohmic contact engineering in few-layer black Phosphorus field effect transistorsMay 14 2019Achieving good quality Ohmic contacts to van der Waals materials is a challenge, since at the interface between metal and van der Waals material, different conditions can occur, ranging from the presence of a large energy barrier between the two materials ... More

Hybrid 2D Black Phosphorus/Polymer Materials: New Platforms for Device FabricationFeb 04 2018Hybrid materials, containing a 2D filler embedded in a polymeric matrix, are an interesting platform for several applications, because of the variety of properties that the filler can impart to the polymer matrix when dispersed at the nanoscale. Moreover, ... More

Novel polystyrene-based nanocomposites by phosphorene dispersionFeb 14 2017Polystyrene-based phosphorene nanocomposites were prepared by a solvent blending procedure allowing the embedding of black phosphorus (BP) nanoflakes in the polymer matrix. Raman spectroscopy, X Ray Diffraction and TEM microscopy were employed to characterize ... More

Polymer-based black phosphorus (bP) hybrid materials by in situ radical polymerization: an effective tool to exfoliate bP and stabilize bP nanoflakesApr 11 2018Black phosphorus (bP) has been recently investigated for next generation nanoelectronic multifunctional devices. However, the intrinsic instability of exfoliated bP (the bP nanoflakes) towards both moisture and air has so far overshadowed its practical ... More

Black Phosphorus/Palladium Nanohybrid: Unraveling the Nature of P-Pd Interaction and Application in Selective HydrogenationMar 06 2019The burgeoning interest in 2D black phosphorus (bP) contributes to expand its applications in countless fields. In the present study, 2D bP is used as a support for homogeneously dispersed palladium nanoparticles directly grown on it by a wet chemical ... More

Large spin-mixing conductance in highly Bi-doped Cu thin filmsJun 04 2018Jul 24 2018Spin Hall effect provides an efficient tool for the conversion of a charge current into a spin current, opening the possibility of producing pure spin currents in non-magnetic materials for the next generation of spintronics devices. In this sense, giant ... More

Non-Classical Longitudinal Magneto-Resistance in Anisotropic Black PhosphorusAug 02 2018Dec 05 2018Resistivity measurements of a few-layer black phosphorus (bP) crystal in parallel magnetic fields up to 45 T are reported as a function of the angle between the in-plane field and the source-drain (S-D) axis of the device. The crystallographic directions ... More

A Perspective on Recent Advances in Phosphorene Functionalization and its Application in DevicesMar 28 2019Phosphorene, the 2D material derived from black phosphorus, has recently attracted a lot of interest for its properties, suitable for applications in material science. In particular, the physical features and the prominent chemical reactivity on its surface ... More

Chemical Composition of Two H II Regions in NGC 6822 Based on VLT SpectroscopyJul 04 2005We present long slit spectrophotometry of regions V and X of the local group irregular galaxy NGC 6822. The data consist of VLT FORS observations in the 3450 to 7500 A range. We have obtained electron temperatures and densities using different line intensity ... More

On the minimum orbital intersection distance computation: a new effective methodJun 21 2018The computation of the Minimum Orbital Intersection Distance (MOID) is an old, but increasingly relevant problem. Fast and precise methods for MOID computation are needed to select potentially hazardous asteroids from a large catalogue. The same applies ... More

Reconstruction of compacta by finite approximations and Inverse PersistenceFeb 12 2018Feb 27 2018The aim of this paper is to show how the homotopy type of compact metric spaces can be reconstructed by the inverse limit of an inverse sequence of finite approximations of the corresponding space. This recovering allows us to define inverse persistence ... More

The Chemical Composition of the Small Magellanic Cloud H II Region NGC 346 and the Primordial Helium AbundanceMar 10 2000Jul 20 2000Spectrophotometry in the 3400-7400 range is presented for 13 areas of the brightest H II region in the SMC: NGC 346. The observations were obtained at CTIO with the 4-m telescope. Based on these observations its chemical composition is derived. The helium ... More

Group rings with Lie metabelian set of symmetric elementsOct 30 2013Let $R$ be a commutative ring of characteristic zero and $G$ an arbitrary group. In the present paper we classify the groups $G$ for which the set of symmetric elements with respect to the classical involution of the group ring $RG$ is Lie metabelian. ... More

Resource Usage Analysis of Logic Programs via Abstract Interpretation Using Sized TypesMay 16 2014We present a novel general resource analysis for logic programs based on sized types. Sized types are representations that incorporate structural (shape) information and allow expressing both lower and upper bounds on the size of a set of terms and their ... More

Relative equilibria in continuous stellar dynamicsJan 27 2010We study a three dimensional continuous model of gravitating matter rotating at constant angular velocity. In the rotating reference frame, by a finite dimensional reduction, we prove the existence of non radial stationary solutions whose supports are ... More

Inference of stochastic parameterizations for model error treatment using nested ensemble Kalman filtersJul 27 2018Stochastic parameterizations are increasingly being used to represent the uncertainty associated with model errors in ensemble forecasting and data assimilation. One of the challenges associated with the use of these parameterizations is the optimization ... More

Energy-based Tuning of Convolutional Neural Networks on Multi-GPUsAug 01 2018Deep Learning (DL) applications are gaining momentum in the realm of Artificial Intelligence, particularly after GPUs have demonstrated remarkable skills for accelerating their challenging computational requirements. Within this context, Convolutional ... More

Movie Editing and Cognitive Event Segmentation in Virtual Reality VideoJun 13 2018Traditional cinematography has relied for over a century on a well-established set of editing rules, called continuity editing, to create a sense of situational continuity. Despite massive changes in visual content across cuts, viewers in general experience ... More

Fortification of Neural Morphological Segmentation Models for Polysynthetic Minimal-Resource LanguagesApr 17 2018Morphological segmentation for polysynthetic languages is challenging, because a word may consist of many individual morphemes and training data can be extremely scarce. Since neural sequence-to-sequence (seq2seq) models define the state of the art for ... More

Seven problems related to the determination of the primordial helium abundanceNov 22 2002Recent advances on the quest to determine the primordial or pregalactic helium abundance, Yp, are reviewed. There are seven problems affecting the He/H abundance determinations of H II regions that are briefly discussed: the underlying absorption lines ... More

Novel Approach Towards Global Optimality of Optimal Power Flow Using Quadratic Convex OptimizationMar 13 2019Optimal Power Flow (OPF) can be modeled as a non-convex Quadratically Constrained Quadratic Program (QCQP). Our purpose is to solve OPF to global optimality. To this end, we specialize the Mixed-Integer Quadratic Convex Reformulation method (MIQCR) to ... More

Indices of the iterates of $R^3$-homeomorphisms at Lyapunov stable fixed pointsApr 18 2007Given any positive sequence (\{c_n\}_{n \in {\Bbb N}}), we construct orientation preserving homeomorphisms (f:{\Bbb R}^3 \to {\Bbb R}^3) such that (Fix(f)=Per(f)=\{0\}), (0) is Lyapunov stable and (\limsup \frac{|i(f^m, 0)|}{c_m}= \infty). We will use ... More

A Similarity Measure for Material AppearanceMay 04 2019We present a model to measure the similarity in appearance between different materials, which correlates with human similarity judgments. We first create a database of 9,000 rendered images depicting objects with varying materials, shape and illumination. ... More

Superdiffusion on complex networks: the role of shortcuts and long-range interactionsFeb 04 2018Jun 08 2018This work addresses the superdiffusive motion of a discrete time random walker on ordered discrete substrates and complex networks with the presence of long-range interactions (LRIs). In ordered regular lattices, where LRIs have a clear geometrical meaning, ... More

Markov chain approach to anomalous diffusion on Newman-Watts networksJan 31 2019Feb 26 2019A Markov chain (MC) formalism is used to investigate the mean-square displacement (MSD) of a random walker on Newman-Watts (NW) networks. It leads to a precise analysis of the conditions for the emergence of anomalous sub- or super-diffusive regimes in ... More

Groups of units of integral group rings commensurable with direct products of free-by-free groupsNov 18 2005Oct 17 2006We classify the finite groups $G$ such that the group of units of the integral group ring ${\mathbb Z} G$ has a subgroup of finite index which is a direct product of free-by-free groups.

Multi-Particle Collision Dynamics for a coarse-grained model of soft colloidsJun 20 2019The growing interest in the dynamical properties of colloidal suspensions, both in equilibrium and under an external drive such as shear or pressure flow, requires the development of accurate methods to correctly include hydrodynamic effects due to the ... More

Parameter dependence of high-frequency nonlinear oscillations and intrinsic chaos in short GaAs/(Al,Ga)As superlatticesJun 28 2017Jul 07 2017We explore the design parameter space of short (5--25 period), n-doped, Ga/(Al,Ga)As semiconductor superlattices (SSLs) in the sequential resonant tunneling regime. We consider SSLs at cool (77K) and warm (295K) temperatures, simulating the electronic ... More

A Julia Module for Polynomial Optimization with Complex Variables applied to Optimal Power FlowApr 18 2019Many optimization problems in power transmission networks can be formulated as polynomial problems with complex variables. A polynomial optimization problem with complex variables consists in optimizing a real-valued polynomial whose variables and coefficients ... More

Phosphorus oxide gate dielectric for black phosphorus field effect transistorsApr 10 2018The environmental stability of the layered semiconductor black phosphorus (bP) remains a challenge. Passivation of the bP surface with phosphorus oxide, POx, grown by a reactive ion etch with oxygen plasma is known to improve photoluminescence efficiency ... More

Early Science with the Large Millimetre Telescope: Fragmentation of molecular clumps in the GalaxySep 26 2017Sensitive, imaging observations of the 1.1 mm dust continuum emission from a 1 deg^2 area collected with the AzTEC bolometer camera on the Large Millimeter Telescope are presented. A catalog of 1545 compact sources is constructed based on a Wiener-optimization ... More

STM Study of Exfoliated Few Layer Black Phosphorus Annealed in Ultrahigh VacuumAug 28 2018Black Phosphorus (bP) has emerged as an interesting addition to the category of two-dimensional materials. Surface-science studies on this material are of great interest, but they are hampered by bP's high reactivity to oxygen and water, a major challenge ... More

Approaching allelic probabilities and Genome-Wide Association Studies from beta distributionsFeb 25 2014In this paper we have proposed a model for the distribution of allelic probabilities for generating populations as reliably as possible. Our objective was to develop such a model which would allow simulating allelic probabilities with different observed ... More

Visible points, the separation problem, and applications to MINLPJul 18 2019In this paper we introduce a technique to produce tighter cutting planes for mixed-integer non-linear programs. Usually, a cutting plane is generated to cut off a specific infeasible point. The underlying idea is to use the infeasible point to restrict ... More

Calculo Estocastico, EDEs y EDPsApr 13 2015This manuscript is a self-contained overview of essential results of stochastic calculus and stochastic differential equations, and their connection with final-value problems for second order linear PDEs.

On the LP formulation in measure spaces of optimal control problems for jump-diffusionsApr 14 2015In this short note we formulate a infinite-horizon stochastic optimal control problem for jump-diffusions of Ito-Levy type as a LP problem in a measure space, and prove that the optimal value functions of both problems coincide. The main tools are the ... More

The shifted plactic monoidNov 13 2008Jan 20 2009We introduce a shifted analog of the plactic monoid of Lascoux and Sch\"utzenberger, the \emph{shifted plactic monoid}. It can be defined in two different ways: via the \emph{shifted Knuth relations}, or using Haiman's mixed insertion. Applications include: ... More

Noise-enhanced chaos in a weakly coupled GaAs/(Al,Ga)As superlatticeJan 10 2017Jan 11 2017Noise-enhanced chaos in a doped, weakly coupled GaAs/Al_{0.45}Ga_{0.55}As superlattice has been observed at room temperature in experiments as well as in the results of the simulation of nonlinear transport based on a discrete tunneling model. When external ... More

Comprehensive classification of the plant non-specific lipid transfer protein superfamily towards its Sequence -Structure -Function analysisMay 02 2019Background. Non-specific Lipid Transfer Proteins (nsLTPs) are widely distributed in the plant kingdom and constitute a superfamily of related proteins. More than 800 different sequences have been characterized so far, but their biological functions remain ... More

Decoration of exfoliated black phosphorus with nickel nanoparticles and application in catalysisSep 16 2016Aug 28 2017Nickel nanoparticles were dispersed on the surface of exfoliated black phosphorus and the resulting nanohybrid Ni/2DBP showed an improved stability respect to pristine 2D BP when kept in ambient conditions in the darkness. Ni/2DBP was applied as catalyst ... More

The role of water in the preparation and stabilization of high quality phosphorene flakesNov 13 2015Water is believed to be harmful for the stability of phosphorene.On the contrary, the presence of small amount of water allows the synthesis of high-quality material in liquid exfoliation of black phosphorus using dimethylsulfoxide as solvent. A phosphorus/water ... More

Structural and Dynamical Patterns on Online Social Networks: the Spanish May 15th Movement as a case studyJul 08 2011The number of people using online social networks in their everyday life is continuously growing at a pace never saw before. This new kind of communication has an enormous impact on opinions, cultural trends, information spreading and even in the commercial ... More

Hop and HipHop : Multitier Web OrchestrationNov 30 2013Rich applications merge classical computing, client-server concurrency, web-based interfaces, and the complex time- and event-based reactive programming found in embedded systems. To handle them, we extend the Hop web programming platform by HipHop, a ... More

Early Science with the Large Millimetre Telescope: Molecules in the Extreme Outflow of a proto-Planetary NebulaJan 04 2017Extremely high velocity emission likely related to jets is known to occur in some proto-Planetary Nebulae. However, the molecular complexity of this kinematic component is largely unknown. We observed the known extreme outflow from the proto-Planetary ... More

UV/IR mixing and the Goldstone theorem in noncommutative field theoryFeb 01 2002May 27 2002Noncommutative IR singularities and UV/IR mixing in relation with the Goldstone theorem for complex scalar field theory are investigated. The classical model has two coupling constants, $\lambda_1$ and $\lambda_2$, associated to the two noncommutative ... More

The Role of Oligomeric Gold-Thiolate Units in Single Molecule Junc-tions of Thiol-Anchored MoleculesMar 20 2018Using the break junction (BJ) technique we show that Au(RS)2 units play a significant role in thiol-terminated molecular junctions formed on gold. We have studied a range of thiol-terminated compounds, either with the sulfur atoms in direct conjugation ... More

Noncovalent functionalization of few-layer black phosphorus with metal nanoparticles and its application in catalysisSep 16 2016Transition metal nanoparticles of Ni, Pd, Ru and Au, each of them stabilized by a suitable capping agent, were dispersed on the surface of few-layer black phosphorus (2D BP) achieving new nanocomposite 2D materials. Ni nanoparticles supported on 2D BP ... More

Perturbative quantization of Yang-Mills theory with classical double as gauge algebraDec 07 2015Feb 22 2016Perturbative quantization of Yang-Mills theory with a gauge algebra given by the classical double of a semisimple Lie algebra is considered. The classical double of a real Lie algebra is a nonsemisimple real Lie algebra that admits a nonpositive definite ... More

Gauge-fixing independence of IR divergences in non-commutative U(1), perturbative tachyonic instabilities and supersymmetryDec 19 2000Jan 19 2001It is argued that the quadratic and linear non-commutative IR divergences that occur in U(1) theory on non-commutative Minkowski spacetime for small non-commutativity matrices $\theta^{\mu\nu}$ are gauge-fixing independent. This implies in particular ... More

IASIS and BigMedilytics: Towards personalized medicine in EuropeSep 20 2018One field of application of Big Data and Artificial Intelligence that is receiving increasing attention is the biomedical domain. The huge volume of data that is customary generated by hospitals and pharmaceutical companies all over the world could potentially ... More

Utility maximization in pure-jump models driven by marked point processes and nonlinear wealth dynamicsNov 04 2014Sep 21 2015We explore martingale and convex duality techniques to study optimal investment strategies that maximize expected risk-averse utility from consumption and terminal wealth. We consider a market model with jumps driven by (multivariate) marked point processes ... More

The PAU Survey: Operation and orchestration of multi-band survey dataNov 06 2018The Physics of the Accelerating Universe (PAU) Survey is an international project for the study of cosmological parameters associated with Dark Energy. PAU's 18-CCD camera (PAUCam), installed at the prime focus of the William Herschel Telescope at the ... More

Optimal continuous-time ALM for insurers: a martingale approachOct 19 2018We study a continuous-time asset-allocation problem for a firm in the insurance industry that backs up the liabilities raised by the insurance contracts with the underwriting profits and the income resulting from investing in the financial market. Using ... More

Optimal relaxed control of dissipative stochastic partial differential equations in Banach spacesJan 18 2010Mar 17 2010We study an optimal relaxed control problem for a class of semilinear stochastic PDEs on Banach spaces perturbed by multiplicative noise and driven by a cylindrical Wiener process. The state equation is controlled through the nonlinear part of the drift ... More

Maximal fillings of moon polyominoes, simplicial complexes, and Schubert polynomialsSep 23 2010Jul 05 2011We exhibit a canonical connection between maximal (0,1)-fillings of a moon polyomino avoiding north-east chains of a given length and reduced pipe dreams of a certain permutation. Following this approach we show that the simplicial complex of such maximal ... More

Towards Proxemic Mobile Collocated InteractionsSep 06 2017Research on mobile collocated interactions has been exploring situations where collocated users engage in collaborative activities using their personal mobile devices (e.g., smartphones and tablets), thus going from personal/individual toward shared/multiuser ... More

Computer-assisted proofs in PDE: a surveyOct 01 2018In this survey we present some recent results concerning computer-assisted proofs in partial differential equations, focusing in those coming from problems in incompressible fluids. Particular emphasis is put on the techniques, as opposed to the results ... More

Martingale approach to optimal portfolio-consumption problems in Markov-modulated pure-jump modelsJun 12 2014We study optimal investment strategies that maximize expected utility from consumption and terminal wealth in a pure-jump asset price model with Markov-modulated (regime switching) jump-size distributions. We give sufficient conditions for existence of ... More

Constraint Handling Rules with Binders, Patterns and Generic QuantificationJul 10 2017Constraint Handling Rules provide descriptions for constraint solvers. However, they fall short when those constraints specify some binding structure, like higher-rank types in a constraint-based type inference algorithm. In this paper, the term syntax ... More

On the existence of stationary patchesJul 18 2018In this paper, we show the existence of a family of analytic stationary patch solutions of the SQG and gSQG equations. This answers an open problem in [F. de la Hoz, Z. Hassainia, T. Hmidi. Arch. Ration. Mech. Anal., 220(3):1209-1281, 2016].

Quasi-symmetric and non-commutative affine Schur functionsMay 10 2012We introduce dual Hopf algebras which simultaneously combine the concepts of the k-Schur function theory with the quasi-symmetric Schur function theory. We construct dual basis of these Hopf algebras with remarkable properties.

Drived diffusion of vector fieldsMar 16 1998Oct 29 1998A model for the diffusion of vector fields driven by external forces is proposed. Using the renormalization group and the $\epsilon$-expansion, the dynamical critical properties of the model with gaussian noise for dimensions below the critical dimension ... More

Noncommutative Einstein-Maxwell pp-wavesJul 25 2006Oct 23 2006The field equations coupling a Seiberg-Witten electromagnetic field to noncommutative gravity, as described by a formal power series in the noncommutativity parameters $\theta^{\alpha\beta}$, is investigated. A large family of solutions, up to order one ... More

On some consequences of the permutation paradigm for data anonymization: centrality of permutation matrices, universal measures of disclosure risk and information loss, evaluation by dominanceJan 29 2017Recently, the permutation paradigm has been proposed in data anonymization to describe any micro data masking method as permutation, paving the way for performing meaningful analytical comparisons of methods, something that is difficult currently in statistical ... More

A general cipher for individual data anonymizationDec 07 2017Over the years, the literature on individual data anonymization has burgeoned in many directions. Borrowing from several areas of other sciences, the current diversity of concepts, models and tools available contributes to understanding and fostering ... More

A multiplicative masking method for preserving the skewness of the original micro-recordsDec 07 2017Masking methods for the safe dissemination of microdata consist of distorting the original data while preserving a pre-defined set of statistical properties in the microdata. For continuous variables, available methodologies rely essentially on matrix ... More

Geometric construction of D-branes in WZW modelsApr 25 2011Sep 02 2011The geometric description of D-branes in WZW models is pushed forward. Our starting point is a gluing condition\, $J_{+}=FJ_-$ that matches the model's chiral currents at the worldsheet boundary through a linear map $F$ acting on the WZW Lie algebra. ... More

Seiberg--Witten maps for $\boldsymbol{SO(1,3)}$ gauge invariance and deformations of gravityAug 14 2008Dec 12 2008A family of diffeomorphism-invariant Seiberg--Witten deformations of gravity is constructed. In a first step Seiberg--Witten maps for an SO(1,3) gauge symmetry are obtained for constant deformation parameters. This includes maps for the vierbein, the ... More

Asymptotic estimates for the parabolic-elliptic Keller-Segel model in the planeJun 09 2012Oct 10 2013We investigate the large-time behavior of the solutions of the two-dimensional Keller-Segel system in self-similar variables, when the total mass is subcritical, that is less than 8\pi after a proper adimensionalization. It was known from previous works ... More

Navigable maps of structural brain networks across speciesJan 18 2018Brains are spatially embedded networks whose architecture has been shaped by physical and biochemical constraints throughout evolution. While these networks provide global connectivity and sustain the broad spectrum of the functions of the brain, the ... More

Spectral determination of semi-regular polygonsSep 18 2017Let us say that an $n$-sided polygon is semi-regular if it is circumscriptible and its angles are all equal but possibly one, which is then larger than the rest. Regular polygons, in particular, are semi-regular. We prove that semi-regular polygons are ... More

On the torsion units of the integral group ring of finite projective special linear groupsAug 19 2015Jan 13 2017H. J. Zassenhaus conjectured that any unit of finite order and augmentation one in the integral group ring of a finite group $G$ is conjugate in the rational group algebra to an element of $G$. One way to verify this is showing that such unit has the ... More

Zassenhaus Conjecture on torsion units holds for $\text{SL}(2,p)$ and $\text{SL}(2,p^2)$Mar 14 2018Apr 09 2018H.J. Zassenhaus conjectured that any unit of finite order and augmentation $1$ in the integral group ring $\mathbb{Z}G$ of a finite group $G$ is conjugate in the rational group algebra $\mathbb{Q}G$ to an element of $G$. We prove the Zassenhaus Conjecture ... More

Subhaloes gone Notts: Subhaloes as tracers of the dark matter halo shapeJan 09 2014Sep 10 2014We study the shapes of subhalo distributions from four dark-matter-only simulations of Milky Way type haloes. Comparing the shapes derived from the subhalo distributions at high resolution to those of the underlying dark matter fields we find the former ... More

Power Challenges of Large Scale Research Infrastructures: the Square Kilometer Array and Solar Energy Integration; Towards a zero-carbon footprint next generation telescopeOct 17 2012The Square Kilometer Array (SKA) will be the largest Global science project of the next two decades. It will encompass a sensor network dedicated to radioastronomy, covering two continents. It will be constructed in remote areas of South Africa and Australia, ... More

Staircase skew Schur functions are Schur P-positiveAug 10 2011We prove Stanley's conjecture that, if delta_n is the staircase shape, then the skew Schur functions s_{delta_n / mu} are non-negative sums of Schur P-functions. We prove that the coefficients in this sum count certain fillings of shifted shapes. In particular, ... More

Entropy/information flux in Hawking radiationDec 07 2015Nov 25 2017Blackbody radiation contains (on average) an entropy of 3.9\pm2.5 bits per photon. If the emission process is unitary, then this entropy is exactly compensated by "hidden information" in the correlations. We extend this argument to the Hawking radiation ... More

A Reconfigurable USAR Robot Designed for Traversing Complex 3D TerrainApr 16 2015The use of robotics in Urban Search and Rescue (USAR) is growing steadily from their initial inception during the 2001 World Trade Centre incident. Despite years of progress, the core design of robots currently in use for USAR purposes has deviated little, ... More

Profiling lung cancer patients using electronic health recordsSep 18 2018If Electronic Health Records contain a large amount of information about the patients condition and response to treatment, which can potentially revolutionize the clinical practice, such information is seldom considered due to the complexity of its extraction ... More

Towards an Abstract Domain for Resource Analysis of Logic Programs Using Sized TypesAug 19 2013We present a novel general resource analysis for logic programs based on sized types.Sized types are representations that incorporate structural (shape) information and allow expressing both lower and upper bounds on the size of a set of terms and their ... More

Negative-feedback self-regulation contributes to robust and high-fidelity transmembrane signal transductionDec 19 2012Apr 20 2013We present a minimal motif model for transmembrane cell signaling. The model assumes signaling events taking place in spatially distributed nanoclusters regulated by a birth/death dynamics. The combination of these spatio-temporal aspects can be modulated ... More

Galactic Scale Absorption Outflow in the Low Luminosity Quasar IRAS~F04250-5718: HST/COS ObservationsJun 10 2011We present absorption line analysis of the outflow in the quasar IRAS F04250-5718. Far-ultraviolet data from the Cosmic Origins Spectrograph onboard the Hubble Space Telescope reveal intrinsic narrow absorption lines from high ionization ions (e.g., C ... More

Dynamical control of the constraints growth in free evolutions of Einstein's equationsApr 17 2003I present a new, simple method to dynamically control the growth of the discretized constraints during a free evolution of Einstein's equations. During an evolution, any given family of formulations is adjusted off the constraints surface in a way such ... More

Digital interferometric demodulation of Placido mires applied to corneal topographyApr 10 2012Apr 17 2012This paper presents a novel digital interferometric method to demodulate Placido fringe patterns. This is a synchronous method which uses a computer-stored conic-wavefront as demodulating reference. Here we focus on the experimental aspects to phase-demodulate ... More

Synchronous phase-demodulation of high spatial frequency, concentric-rings, Placido fringe patternsMar 08 2012Apr 17 2012Here a synchronous phase-demodulation method for high spatial frequency (HSF), concentric-rings Placido fringe pattern is proposed. The earliest use of this concentric-rings pattern was to gauge non-spherical irregularities of the human cornea by Portuguese ... More

On Methods for the Formal Specification of Fault Tolerant SystemsJul 08 2012This paper introduces different views for understanding problems and faults with the goal of defining a method for the formal specification of systems. The idea of Layered Fault Tolerant Specification (LFTS) is proposed to make the method extensible to ... More

A Supersymmetric Explanation of the Excess of Higgs--Like Events at the LHC and at LEPOct 24 2012Nov 29 2012The LHC collaborations have recently announced evidence for the production of a "Higgs--like" boson with mass near 125 GeV. The properties of the new particle are consistent (within still quite large uncertainties) with those of the Higgs boson predicted ... More

Supersymmetric Dark Matter 2004Oct 07 2004Recent cosmological data allow to determine the universal Dark Matter (DM) density to a precision of about 10%, if a simple, well-motivated ansatz for the spectrum of primordial density perturbations is correct. Not surprisingly, a thermal neutralino ... More

Recent Developments in Dark Matter PhysicsMar 07 1997After a short review of the arguments for the existence of Particle Dark Matter in the Universe, I list the most plausible candidates provided by particle physics, i.e. neutrinos, axions, and WIMPs. In each case I briefly describe how to estimate the ... More

An Introduction to SupersymmetryNov 25 1996A fairly elementary introduction to supersymmetric field theories in general and the minimal supersymmetric Standard Model (MSSM) in particular is given. Topics covered include the cancellation of quadratic divergencies, the construction of the supersymmetric ... More

Multiple Interactions in gamma gamma CollisionsJun 29 1995The cross--section for two--photon events with (at least) two independent partonic scatters is estimated, for LEP energies as well as a 500 GeV ``photon collider". This results in events with (at least) four central (mini--)jets. Such events might be ... More

Complexity Classification in Infinite-Domain Constraint SatisfactionJan 04 2012Sep 14 2016A constraint satisfaction problem (CSP) is a computational problem where the input consists of a finite set of variables and a finite set of constraints, and where the task is to decide whether there exists a satisfying assignment of values to the variables. ... More

Odd Tachyons in Compact Extra DimensionsMar 17 2008We consider a real scalar field with an arbitrary negative bulk mass term in a general 5D setup, where the extra spatial coordinate is a warped interval of size $\pi R$. When the 5D field verifies Neumann conditions at the boundaries of the interval, ... More

On locally coherent heartsMay 09 2016Oct 05 2016We show that, under particular conditions, if a t-structure in the unbounded derived category of a locally coherent Grothendieck category restricts to the bounded derived category of its category of finitely presented objects, then its heart is itself ... More

A Korn-type inequality in SBD for functions with small jump setsMay 04 2015Feb 12 2016We present a Korn-type inequality in a planar setting for special functions of bounded deformation. We prove that for each function in SBD$^2$ with sufficiently small jump set the distance of the function and its derivative from an infinitesimal rigid ... More

A sterile neutrino at MiniBooNE and IceCubeFeb 04 2014We discuss the possibility that a sterile neutrino of mass around 50 MeV slightly mixed with the muon flavor may be the origin of the MiniBooNE anomaly. We show that its production in the atmosphere in a fraction of kaon decays would imply an excess of ... More

Characterization of a Test Site for the Measuring of the Focal Point of Reflective Optical Elements for Concentrator PhotovoltaicOct 28 2014In order to achieve a large deployment of renewable energies, the electricity production costs have to be as low as possible. Many different technologies have been proposed to achieve the best efficiency to cost ratio. One of those is concentrating photovoltaics ... More

Three-body repulsive forces among identical bosons in one dimensionFeb 05 2019I consider non-relativistic bosons interacting via pairwise potentials with infinite scattering length and supporting no two-body bound states. To lowest order in effective field theory, these conditions lead to non-interacting bosons, since the coupling ... More

Representation dimension of extensions of hereditary algebrasDec 01 2008We show that if H is a hereditary finite dimensional algebra, M is a finitely generated H-module and B is a semisimple subalgebra of the endomorphism algebra of M, then the representation dimension of the corresponding triangular matrix algebra is less ... More

Disformal Transformations in Scalar-Torsion GravityMay 01 2019We study disformal transformations in the context of scalar extensions to teleparallel gravity, in which the gravitational interaction is mediated by the torsion of a flat, metric compatible connection. We find a generic class of scalar-torsion actions ... More