Results for "M. Lozada-Hidalgo"

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Atomically-thin micas as proton conducting membranesJun 11 2019Monolayers of graphene and hexagonal boron nitride (hBN) are highly permeable to thermal protons. For thicker two-dimensional (2D) materials, proton conductivity diminishes exponentially so that, for example, monolayer MoS2 that is just three atoms thick ... More
Complete steric exclusion of ions and proton transport through confined monolayer waterNov 22 2018Dec 21 2018It has long been an aspirational goal to create artificial structures that allow fast permeation of water but reject even the smallest hydrated ions, replicating the feat achieved by nature in protein channels (e.g., aquaporins). Despite recent progress ... More
Sieving hydrogen isotopes through two dimensional crystalsNov 20 2015Jan 02 2016One-atom-thick crystals are impermeable to atoms and molecules, but hydrogen ions (thermal protons) penetrate through them. We show that monolayers of graphene and boron nitride can be used to separate hydrogen ion isotopes. Employing electrical measurements ... More
Vortices on demand in multicomponent Bose-Einstein condensatesJul 05 2012Nov 22 2012We present a simple mechanism to produce vortices at any desired spatial locations in harmonically trapped Bose-Einstein condensates (BEC) with multicomponent spin states coupled to external transverse and axial magnetic fields. The vortices appear at ... More
Molecular transport through capillaries made with atomic-scale precisionJun 29 2016Sep 08 2016Nanometre-scale pores and capillaries have long been studied because of their importance in many natural phenomena and their use in numerous applications. A more recent development is the ability to fabricate artificial capillaries with nanometre dimensions, ... More
Giant photo-effect in proton transport through graphene membranesJan 15 2018Graphene has recently been shown to be permeable to thermal protons, the nuclei of hydrogen atoms, which sparked interest in its use as a proton-conducting membrane in relevant technologies. However, the influence of light on proton permeation remains ... More
Understanding individual human mobility patternsJun 07 2008Despite their importance for urban planning, traffic forecasting, and the spread of biological and mobile viruses, our understanding of the basic laws governing human motion remains limited thanks to the lack of tools to monitor the time resolved location ... More
Scalable and efficient separation of hydrogen isotopes using graphene-based electrochemical pumpingFeb 24 2017May 17 2017Thousands of tons of isotopic mixtures are processed annually for heavy-water production and tritium decontamination. The existing technologies remain extremely energy intensive and require large capital investments. New approaches are needed to reduce ... More
Linking Economic Complexity, Institutions and Income InequalityMay 29 2015Jan 04 2017A country's mix of products predicts its subsequent pattern of diversification and economic growth. But does this product mix also predict income inequality? Here we combine methods from econometrics, network science, and economic complexity to show that ... More
Large Deviations for Random Power Moment ProblemOct 06 2004We consider the set M_n of all n-truncated power moment sequences of probability measures on [0,1]. We endow this set with the uniform probability. Picking randomly a point in M_n, we show that the upper canonical measure associated with this point satisfies ... More
Very long-range attractive and repulsive forces in Model Colloidal DispersionsDec 08 2018Experiments with polymer latex solutions show the coexistence of order-disorder structures of macroions. Because of the large macroions' sizes, this order-disorder phase coexistence imply the existence of very long-range attractive and repulsive forces, ... More
Dynamic transport regulation by zonal flow-like structures in the TJ-II stellaratorApr 18 2012Floating potential structures that are correlated over a long distance are observed with a 2D probe array in the plasma edge of the TJ-II stellarator. We introduce a method based on the Singular Value Decomposition to extract the spatio-temporal structure ... More
One-Dimensional Photon Transport Through a Two-Terminal Scattering Cluster: Tight-Binding FormalismMar 27 2017Employing tight-binding approximation we derive a transfer matrix formalism for one-dimensional single photon transport through a composite scattering center, which consists of parallel connected resonator optical waveguides. By solving the single-mode ... More
Transport of hydrogen isotopes through interlayer spacing in van der Waals crystalsFeb 09 2018Atoms start behaving as waves rather than classical particles if confined in spaces commensurate with their de Broglie wavelength. At room temperature this length is only about one angstrom even for the lightest atom, hydrogen. This restricts quantum-confinement ... More
The impact of heating power on radial heat transport in W7-XAug 07 2017The understanding of the outward radial transport of heat in magnetic confinement fusion devices is a priority for the development of economically viable fusion reactors. Here, we analyze the radial propagation of spontaneously generated electron temperature ... More
The use of the Biorthogonal Decomposition for the identification of zonal flows at TJ-IIAug 08 2014Oct 22 2014This work addresses the identification of zonal flows in fusion plasmas. Zonal flows are large scale phenomena, hence multipoint measurements taken at remote locations are required for their identification. Given such data, the Biorthogonal Decomposition ... More
Disconnected, fragmented, or united? A trans-disciplinary review of network scienceNov 12 2015Jul 15 2016During decades the study of networks has been divided between the efforts of social scientists and natural scientists, two groups of scholars who often do not see eye to eye. In this review I present an effort to mutually translate the work conducted ... More
The Building Blocks of Economic ComplexitySep 22 2009For Adam Smith, wealth was related to the division of labor. As people and firms specialize in different activities, economic efficiency increases, suggesting that development is associated with an increase in the number of individual activities and with ... More
The role of magnetic islands in modifying long range temporal correlations of density fluctuations and local heat transportJun 23 2015This work explores the relation between magnetic islands, long range temporal correlations and heat transport. A low order rational surface ($\iota/2\pi = 3/2$) was purposely scanned outward through an Electron Cyclotron Resonance Heated (ECRH) plasma ... More
Proton transport through one atom thick crystalsOct 31 2014Graphene is impermeable to all gases and liquids, and even such a small atom as hydrogen is not expected to penetrate through graphene's dense electronic cloud within billions of years. Here we show that monolayers of graphene and hexagonal boron nitride ... More
Mapping the stellar age of the Milky Way bulge with the VVV. I. The methodFeb 05 2019Recent observational programmes are providing a global view of the Milky Way bulge that serves as template for detailed comparison with models and extragalactic bulges. A number of surveys (i.e. VVV, GIBS, GES, ARGOS, BRAVA, APOGEE) are producing comprehensive ... More
The causal impact of magnetic fluctuations in slow and fast L-H transitions at TJ-IIDec 21 2015Jun 21 2016This work focuses on the relationship between L-H (or L-I) transitions and MHD activity in the low magnetic shear TJ-II stellarator. It is shown that the presence of a low order rational surface in the plasma edge (gradient) region lowers the threshold ... More
Long-range overcharging and long-range charge reversal in model colloidal dispersionsDec 01 2017Most theoretical and simulation studies on charged particles suspensions are at infinite dilution conditions. Hence these studies have been focused on the electrolyte structure around an isolated central particle (or elctrode), where phenomena as charge ... More
An estimation of distribution algorithm for the computation of innovation estimators of diffusion processesApr 06 2018Estimation of Distribution Algorithms (EDAs) and Innovation Method are recognized methods for solving global optimization problems and for the estimation of parameters in diffusion processes, respectively. Well known is also that the quality of the Innovation ... More
Coherent control of phase diffusion in a Bosonic Josephson junction by scattering length modulationApr 15 2013By means of a temporal-periodic modulation of the s-wave scattering length, a procedure to control the evolution of an initial atomic coherent state associated with a Bosonic Josephson junction is presented. The scheme developed has a remarkable advantage ... More
Finite-Time and -Size Scalings in the Evaluation of Large Deviation Functions - Part II: Numerical Approach in Continuous TimeJul 29 2016Rare trajectories of stochastic systems are important to understand -- because of their potential impact. However, their properties are by definition difficult to sample directly. Population dynamics provide a numerical tool allowing their study, by means ... More
Stringy (Galilei) Newton-Hooke Chern-Simons GravitiesMay 30 2019We construct Chern-Simons gravities in $(2+1)$-dimensional space-time considering the Stringy Galilei algebra both with and without non-central extensions. In the first case, there is an invariant and non-degenerate bilinear form, however, the field equations ... More
Fields of moduli of classical Humbert curvesSep 16 2016The computation of the field of moduli of a closed Riemann surface seems to be a very difficult problem and even more difficult is to determine if the field of moduli is a field of definition. In this paper we consider the family of closed Riemann surfaces ... More
The role of host star variability in the detectability of planetary phase curvesOct 17 2018Phase curves, or the change in observed illumination of the planet as it orbits around its host star, help us to characterize their atmospheres. However, the variability of the host star can make their detection challenging: the presence of starspots, ... More
A study of the fractional quantum Hall effect: Odd and even denominator plateauxOct 07 2013Nov 19 2013We present a different approach to the fractional quantum Hall effect (FQHE), focusing it as a consequence of the change in the symmetry of the Hamiltonian of every electron in a two-dimensional electron gas (2DEG) under the application of a magnetic ... More
The amenity space and the evolution of neighborhoodsSep 09 2015Jul 20 2016Neighborhoods populated by amenities--such as restaurants, cafes, and libraries--are considered to be a key property of desirable cities. Yet, despite the global enthusiasm for amenity-rich neighborhoods, little is known about the empirical laws governing ... More
Beyond network structure: How heterogenous susceptibility modulates the spread of epidemicsMar 10 2014The compartmental models used to study epidemic spreading often assume the same susceptibility for all individuals, and are therefore, agnostic about the effects that differences in susceptibility can have on epidemic spreading. Here we show that--for ... More
On the connectedness of the set of Riemann surfaces with real moduliOct 12 2017Nov 10 2017The moduli space ${\mathcal{M}}_{g}$, of genus $g\geq2$ closed Riemann surfaces, is a complex orbifold of dimension $3(g-1)$ which carries a natural real structure i.e. it admits an anti-holomorphic involution $\sigma$. The involution $\sigma$ maps each ... More
Inverse Low Gain Avalanche Detectors (iLGADs) for precise tracking and timing applicationsApr 03 2019Low Gain Avalanche Detector (LGAD) is the baseline sensing technology of the recently proposed Minimum Ionizing Particle (MIP) end-cap timing detectors (MTD) at the Atlas and CMS experiments. The current MTD sensor is designed as a multi-pad matrix detector ... More
Two rods confined by positive plates: Effective forces and charge distribution profilesOct 15 2010Monte Carlo simulations were employed to study two negative rods confined between two parallel plates. The system is immersed in a 1-1 restricted primitive model electrolyte. Ion distributions and forces per unit of area (pressures) on rods and plates ... More
A study of the magnetotransport properties of the graphene (I. Monolayer)Apr 22 2014We present a single electron approach to analyse the magnetotransport properties of the monolayer graphene as a function of both, the gate voltage and the magnetic field; and, also, their evolution with temperature. The model proposed means the extension ... More
A study of the magnetotransport properties of the graphene (II. Fractional Quantum Hall Effect)Jul 17 2015We present an approach to the fractional quantum Hall effect observed in grapheme (GFQHE), basing us on the model developed previously for the fractional quantum Hall effect in a two-dimensional electron system embedded in a quantum well (FQHE) [Hidalgo, ... More
The effect of confinement on the interaction between two like-charged rodsOct 15 2010Monte Carlo simulations were employed to study two charged rods confined between two unlike charged plates, all immersed in a model electrolyte. Recently, it was shown that two rods immersed in a multivalent counterion solution may show attraction (PRL ... More
Spin Magnetotransport in a Two-Dimensional Electron System under quantum Hall regime and with Rashba spin-orbit effectJan 12 2012The article shows a simple model that computes the magnetoconduction and the integer quantum Hall effect (IQHE) in a two-dimensional electron system (2DES) where the spin is other degree of freedom in the system. The 2DES is confined in a quantum well ... More
A model for the study of the Shubnikov-de Haas and the integer quantum Hall effects in a two dimensional electronic systemJul 30 2007Up to know all the experimental results concerning the integer and fractional quantum Hall effect are related to semiconductor heterostructures (and more recently with graphene). The common characteristic of all these systems is the presence of a reservoir ... More
The ACS LCID Project: On the origin of dwarf galaxy types: a manifestation of the halo assembly bias?Jul 30 2015We discuss how knowledge of the whole evolutionary history of dwarf galaxies, including details on the early star formation events, can provide insight on the origin of the different dwarf galaxy types. We suggest that these types may be imprinted by ... More
Bridgeland stability conditions on the category of holomorphic triples over curvesMay 10 2019We give a complete description of the Bridgeland stability manifold for the bounded derived category of holomorphic triples over a smooth projective curve of genus 1 as a connected, four dimensional complex manifold.
The role of industry, occupation, and location specific knowledge in the survival of new firmsJul 23 2018How do regions acquire the knowledge they need to diversify their economic activities? How does the migration of workers among firms and industries contribute to the diffusion of that knowledge? Here we measure the industry, occupation, and location-specific ... More
729 new measures of economic complexity (Addendum to Improving the Economic Complexity Index)Aug 09 2017Recently we uploaded to the arxiv a paper entitled: Improving the Economic Complexity Index. There, we compared three metrics of the knowledge intensity of an economy, the original metric we published in 2009 (the Economic Complexity Index or ECI), a ... More
A dynamic network approach for the study of human phenotypesSep 22 2009The use of networks to integrate different genetic, proteomic, and metabolic datasets has been proposed as a viable path toward elucidating the origins of specific diseases. Here we introduce a new phenotypic database summarizing correlations obtained ... More
A study of the magnetotransport properties of the graphene (III. Bilayer)Feb 08 2016The present paper corresponds to the third work of the author related to the magnetotransport properties concerning on the graphene systems. In the first one the integer quantum Hall effect in the monolayer graphene, (MG), MGIQHE, was analysed, (Hidalgo, ... More
Improving the Economic Complexity IndexJul 18 2017Jul 24 2017How much knowledge is there in an economy? In recent years, data on the mix of products that countries export has been used to construct measures of economic complexity that estimate the knowledge available in an economy and predict future economic growth. ... More
How the medium shapes the message: Printing and the rise of the arts and sciencesDec 16 2015Aug 09 2017Communication technologies, from printing to social media, affect our historical records by changing the way ideas are spread and recorded. Yet, finding statistical instruments to address the endogeneity of this relationship has been problematic. Here ... More
Relatedness, Knowledge Diffusion, and the Evolution of Bilateral TradeSep 15 2017During the last decades two important contributions have reshaped our understanding of international trade. First, countries trade more with those with whom they share history, language, and culture, suggesting that trade is limited by information frictions. ... More
The Dynamics of Nestedness Predicts the Evolution of Industrial EcosystemsMar 16 2012Jul 03 2012In economic systems, the mix of products that countries make or export has been shown to be a strong leading indicator of economic growth. Hence, methods to characterize and predict the structure of the network connecting countries to the products that ... More
Diffuse Ionized Gas inside the dwarf irregular galaxy NGC 6822Mar 05 2007We have studied the differences between the diffuse ionized gas (DIG) and the HII regions along a slit position in the local dwarf irregular galaxy NGC 6822. The slit position passes through the two most prominent HII regions: Hubble V and Hubble X. Important ... More
Production of W-+ with an anomalous magnetic moment via the collision of an ultrahigh-energy (anti)neutrino on a target nucleonOct 21 2003Sep 09 2004We discuss the production of W-+ bosons in deep inelastic processes (anti-nu)nu + nucleon --> l+- + W-+ + X, in the context of an electroweak model in which the vector boson self interactions may be different from those prescribed by the electroweak standard ... More
Entanglement of a two-atom system driven by the quantum vacuum in arbitrary cavity sizeNov 04 2015Nov 10 2015We study the dynamical entanglement of two identical atoms interacting with a quantum field. As a simplified model for this physical system we consider two harmonic oscillators linearly coupled to a massless scalar field in the dressed coordinates and ... More
On recent SFR calibrations and the constant SFR approximationFeb 11 2016Star Formation Rate (SFR) inferences are based in the so-called constant SFR approximation, where synthesis models are require to provide a calibration; we aims to study the key points of such approximation to produce accurate SFR inferences. We use the ... More
Non-Kramers Freezing and Unfreezing of Tunneling in the Biaxial Spin ModelFeb 16 1999Jul 11 2000The ground state tunnel splitting for the biaxial spin model in the magnetic field, H = -D S_{x}^2 + E S_{z}^2 - g \mu_B S_z H_z, has been investigated using an instanton approach. We find a new type of spin instanton and a new quantum interference phenomenon ... More
Entropy production for coarse-grained dynamicsOct 03 2018Systems out of equilibrium exhibit a net production of entropy. We study the dynamics of a stochastic system represented by a master equation that can be modeled by a Fokker-Planck equation in a coarse-grained, mesoscopic description. We show that the ... 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
Metallicity determination in gas-rich galaxies with semiempirical methodsDec 04 2008A study of the precision of the semiempirical methods used in the determination of the chemical abundances in gas-rich galaxies is carried out. In order to do this the oxygen abundances of a total of 438 galaxies were determined using the electronic temperature, ... More
Heavy boson production through the collision of an ultrahigh-energy neutrino on a target nucleonOct 09 2003Apr 07 2004We discuss W and Z production through the deep inelastic neutrino-nucleon scattering in the context of the standard model SU(3)x SU(2)x U(1) of the strong and electroweak interactions. We find the cross section rates for the process neutrino + nucleon ... More
Tunneling with dissipation and decoherence for a large spinJan 11 2002Feb 18 2002We present rigorous solution of problems of tunneling with dissipation and decoherence for a spin of an atom or a molecule in an isotropic solid matrix. Our approach is based upon switching to a rotating coordinate system coupled to the local crystal ... More
Entropy production in systems with random transition ratesAug 07 2017We study the entropy production of a system with a finite number of states connected by random transition rates. The stationary entropy production, driven out of equilibrium both by asymmetric transition rates and by an external probability current, is ... More
Quantum simulation of the Anderson Hamiltonian with an array of coupled nanoresonators: delocalization and thermalization effectsAug 27 2015May 30 2016The possibility of using nanoelectromechanical systems as a simulation tool for quantum many-body effects is explored. It is demonstrated that an array of electrostatically coupled nanoresonators can effectively simulate the Bose-Hubbard model without ... More
The Research Space: using the career paths of scholars to predict the evolution of the research output of individuals, institutions, and nationsFeb 26 2016Apr 14 2016In recent years scholars have built maps of science by connecting the academic fields that cite each other, are cited together, or that cite a similar literature. But since scholars cannot always publish in the fields they cite, or that cite them, these ... More
The star formation history of the Sculptor dwarf spheroidal galaxyJun 17 2019We present the star formation history (SFH) of the Sculptor dwarf spheroidal galaxy based on deep g,r photometry taken with DECam at the Blanco telescope, focusing our analysis on the central region of the galaxy extended up to $\sim 3$ core radii. We ... More
Relaxation of potential, flows, and density in the edge plasma of CASTOR tokamakOct 22 2004Decay times of plasma flows and plasma profiles have been measured after a sudden biasing switch-off in experiments on the CASTOR tokamak. A biased electrode has been used to polarize the edge plasma. The edge plasma potential and flows have been characterized ... More
Deep Learning the City : Quantifying Urban Perception At A Global ScaleAug 05 2016Sep 12 2016Computer vision methods that quantify the perception of urban environment are increasingly being used to study the relationship between a city's physical appearance and the behavior and health of its residents. Yet, the throughput of current methods is ... More
Sherlock: A Deep Learning Approach to Semantic Data Type DetectionMay 25 2019Correctly detecting the semantic type of data columns is crucial for data science tasks such as automated data cleaning, schema matching, and data discovery. Existing data preparation and analysis systems rely on dictionary lookups and regular expression ... More
Review on Computer Vision Techniques in Emergency SituationAug 24 2017Mar 09 2018In emergency situations, actions that save lives and limit the impact of hazards are crucial. In order to act, situational awareness is needed to decide what to do. Geolocalized photos and video of the situations as they evolve can be crucial in better ... More
Gravitational lensing with $ f(χ)=χ^{3/2} $ gravity in accordance with astrophysical observationsAug 30 2012Apr 29 2013In this article we perform a second order perturbation analysis of the gravitational metric theory of gravity $ f(\chi) = \chi^{3/2} $ developed by Bernal et al. (2011). We show that the theory accounts in detail for two observational facts: (1) the phenomenology ... More
Bayesian evidence for $α$-attractor dark energy modelsMay 02 2019Dark energy models with tracker properties have gained attention due to the large range of initial conditions leading to the current value of the dark energy density parameter. A well-motivated family of these models are the so-called $\alpha$-attractors, ... More
Counting the Number of Crossings in Geometric GraphsApr 24 2019A geometric graph is a graph whose vertices are points in general position in the plane and its edges are straight line segments joining these points. In this paper we give an $O(n^2 \log n)$ algorithm to compute the number of pairs of edges that cross ... More
Computational Aspects of Optimal Strategic Network DiffusionSep 10 2018The diffusion of information has been widely modeled as stochastic diffusion processes on networks. Alshamsi et al. (2018) proposed a model of strategic diffusion in networks of related activities. In this work we investigate the computational aspects ... More
Complex Economic Activities Concentrate in Large CitiesJul 20 2018Why do some economic activities agglomerate more than others? And, why does the agglomeration of some economic activities continue to increase despite recent developments in communication and transportation technologies? In this paper, we present evidence ... More
Universal behavior of the full particle statistics of one-dimensional Coulomb gases with an arbitrary external potentialMar 29 2018We present a complete theory for the full particle statistics of the positions of bulk and extremal particles in a one-dimensional Coulomb Gas (CG) with an arbitrary potential, in the typical and large deviations regimes. Typical fluctuations are described ... More
Spontaneous decay in arbitrary cavity sizeNov 01 2017We consider a complete study of the influence of the cavity size on the spontaneous decay of an atom excited state, roughly approximated by a harmonic oscillator. We confine the oscillator-field system in a spherical cavity of radius $R$, perfectly reflective, ... More
Collective computation in a network with distributed informationApr 17 2014We analyze a distributed information network in which each node has access to the information contained in a limited set of nodes (its neighborhood) at a given time. A collective computation is carried out in which each node calculates a value that implies ... More
Heavy Quark Spin Symmetry and SU(3)-Flavour Partners of the X(3872)Nov 29 2012In this work, an Effective Field Theory (EFT) incorporating light SU(3)-flavour and heavy quark spin symmetry is used to describe charmed meson-antimeson bound states. At Lowest Order (LO), this means that only contact range interactions among the heavy ... More
Explorability and the origin of Network Sparsity in Living SystemsDec 30 2016Feb 02 2017The increasing volume of ecologically and biologically relevant data has revealed a wide collection of emergent patterns in living systems. Analyzing different datasets, ranging from metabolic gene-regulatory to species interaction networks, we find that ... More
Signatures of Neutrino Cooling in the SN1987A ScenarioFeb 25 2014Apr 29 2014The neutrino signal from SN1987A confirmed the core-collapse scenario and the possible formation of a neutron star. Although this compact object has eluded all observations, theoretical and numerical developments have allowed a glimpse of the fate of ... More
Quantum-Classical Transition of the Escape Rate of a Uniaxial Spin System in an Arbitrarily Directed FieldMay 06 1998Jun 05 1998The escape rate \Gamma of the large-spin model described by the Hamiltonian H = -DS_z^2 - H_zS_z - H_xS_x is investigated with the help of the mapping onto a particle moving in a double-well potential U(x). The transition-state method yields $\Gamma$ ... More
Dipolar ordering in Fe8?Apr 13 2000Jan 18 2001We show that the low-temperature physics of molecular nanomagnets, contrary to the prevailing one-molecule picture, must be determined by the long-range magnetic ordering due to many-body dipolar interactions. The calculations here performed, using Ewald's ... More
The Star Formation History in a SMC field: IAC-star/IAC-pop at workMar 09 2007We present a progress report of a project to study the quantitative star formation history (SFH) in different parts of the Small Magellanic Cloud (SMC). We use the information in [(B-R), R] color-magnitude diagrams (CMDs), which reach down to the oldest ... More
Old Main Sequence Turnoff Photometry in the Small Magellanic Cloud. II. Star Formation History and Its Spatial GradientsSep 15 2009We present a quantitative analysis of the SFH of 12 fields in the SMC. We find that there are four main periods of enhancement of star formation: a young one peaked at around 0.2-0.5 Gyr old, only present in the eastern and in the central-most fields; ... More
Knowledge management metrics for Public Organizations: A literature review-based proposalSep 29 2016Knowledge Management (KM) is a relatively new phenomenon that appears in the field of Public Sector Organizations (PSO) bringing new paradigms of organizational management, challenges, risks and opportunities for its implementation, development and evaluation. ... More
Collective Learning in China's Regional Economic DevelopmentMar 04 2017Industrial development is the process by which economies learn how to produce new products and services. But how do economies learn? And who do they learn from? The literature on economic geography and economic development has emphasized two learning ... More
The structural constraints of income inequality in Latin AmericaJan 13 2017Jan 17 2017Recent work has shown that a country's productive structure constrains its level of economic growth and income inequality. Here, we compare the productive structure of countries in Latin America and the Caribbean (LAC) with that of China and other High-Performing ... More
Eco-evolutionary Model of Rapid Phenotypic Diversification in Species-Rich CommunitiesOct 03 2018Evolutionary and ecosystem dynamics are often treated as different processes --operating at separate timescales-- even if evidence reveals that rapid evolutionary changes can feed back into ecological interactions. A recent long-term field experiment ... More
Dressed coordinates: the path-integrals approachJun 30 2005Feb 03 2007The recent introduced \textit{dressed coordinates} are studied in the path-integral approach. These coordinates are defined in the context of a harmonic oscillator linearly coupled to massless scalar field and, it is shown that in this model the dressed ... More
Hidden charm molecules in a Finite VolumeDec 18 2013In the present paper we address the interaction of charmed mesons in hidden charm channels in a finite box. We use the interaction from a recent model based on heavy quark spin symmetry that predicts molecules of hidden charm in the infinite volume. The ... More
On the vertical equilibrium of the local Galactic disk and the search for disk dark matterMar 22 2011Estimates of the dynamical surface mass density at the solar Galactocentric distance are commonly derived assuming that the disk is in vertical equilibrium with the Galactic potential. This assumption has recently been called into question, based on the ... More
The simultaneous discharge of liquid and grains from a siloJan 17 2018The flow rate of water through an orifice at the bottom of a container depends on the hydrostatic pressure whereas for a dry granular material is nearly constant. But what happens during the simultaneous discharge of grains and liquid from a silo? By ... More
Core regulatory network motif underlies the ocellar complex patterning in Drosophila melanogasterApr 17 2014Dec 16 2014During organogenesis, developmental programs governed by Gene Regulatory Networks (GRN) define the functionality, size and shape of the different constituents of living organisms. Robustness, thus, is an essential characteristic that GRNs need to fulfill ... More
Understanding the spreading patterns of mobile phone virusesJun 24 2009We model the mobility of mobile phone users to study the fundamental spreading patterns characterizing a mobile virus outbreak. We find that while Bluetooth viruses can reach all susceptible handsets with time, they spread slowly due to human mobility, ... More
The Two-loop Massless phi^4 Model in Non-translational Invariant DomainDec 08 2005We study the $\frac{\lambda}{4!}\phi^{4}$ massless scalar field theory in a four-dimensional Euclidean space, where all but one of the coordinates are unbounded. We are considering Dirichlet boundary conditions in two hyperplanes, breaking the translation ... More
Light Flavour and Heavy Quark Spin Symmetry in Heavy Meson MoleculesOct 19 2012May 17 2013We propose an effective field theory incorporating light SU(3)-flavour and heavy quark spin symmetry to describe charmed meson-antimeson bound states. At lowest order the effective field theory entails a remarkable simplification: it only involves contact ... More
Sum rules in the oscillator radiation processesOct 11 2004Sep 21 2005We consider the problem of an harmonic oscillator coupled to a scalar field in the framework of recently introduced dressed coordinates. We compute all the probabilities associated with the decay process of an excited level of the oscillator. Instead ... More
Radial structure of vorticity in the plasma boundary of ISTTOK tokamakApr 19 2018Jul 04 2018The first experimental measurements of vorticity and vorticity flux in a fusion device were performed in tokamak ISTTOK. This is an important achievement since vorticity plays a key role in the transport of energy and particles in plasmas and fluids. ... More
The Fine-Tuning Problem in Little Higgs ModelsMay 09 2005Little Higgs models represent an alternative to Supersymmetry as a solution to the Hierarchy Problem. After introducing the main physical ideas of these models, we present the fine-tuning associated to the electroweak breaking in Little Higgs scenarios. ... More
Emergence and Variability of Broad Absorption Line Quasar OutflowsJul 19 2018We isolate a set of quasars that exhibit emergent C iv broad absorption lines (BALs) in their spectra by comparing spectra in the SDSS Data Release 7 and the SDSS/BOSS Data Releases 9 and 10. After visually defining a set of emergent BALs, follow-up observations ... More
Semiparametric estimation for stationary processes whose spectra have an unknown poleAug 17 2005We consider the estimation of the location of the pole and memory parameter, \lambda ^0 and \alpha, respectively, of covariance stationary linear processes whose spectral density function f(\lambda) satisfies f(\lambda)\sim C| \lambda -\lambda ^0| ^{-\alpha} ... More