Results for "M. J. G. Borge"

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The enigmatic B[e]-star Henize 2-90: The non-spherical mass loss history from an analysis of forbidden linesMay 10 2005(abridged) We study the optical spectrum of the exciting B[e] star Hen 2-90 based on new high-resolution observations that cover the innermost 2". Our investigation is splitted in two parts, a qualitative study of the presence of the numerous emission ... More
The compact planetary nebula B[e] star Hen 2-90Nov 30 2005We present a study of the optical spectrum of the fascinating B[e] star Hen 2-90 based on new high-resolution observations taken with FEROS at the ESO 1.52m telescope in La Silla (Chile). The recent HST image of Hen 2-90 (Sahai et al. 2002) reveals a ... More
The Evolutionary Stage of 5 Southern Galactic Unclassified B[e] StarsDec 20 2002The spectra of stars with the B[e] phenomenon are dominated by features that are related to physical conditions of circumstellar material around these objects and are not intrinsic to the stars. Because of this, they form a very heterogeneous group. This ... More
The Analysis of the Rotating Disk of some Southern Galactic B[e] StarsDec 20 2002The spectra of stars with the B[e] phenomenon are dominated by features that are related to physical conditions of circumstellar material around these objects and are not intrinsic to the stars. Previous studies have shown that emission lines present ... More
Z2Z4-linear codes: generator matrices and dualityOct 05 2007A code ${\cal C}$ is $\Z_2\Z_4$-additive if the set of coordinates can be partitioned into two subsets $X$ and $Y$ such that the punctured code of ${\cal C}$ by deleting the coordinates outside $X$ (respectively, $Y$) is a binary linear code (respectively, ... More
Two Superconducting Phases in CeRh_1-xIr_xIn_5May 27 2004Pressure studies of CeRh_1-xIr_xIn_5 indicate two superconducting phases as a function of x, one with T_c >= 2 K for x < 0.9 and the other with T_c < 1.2 K for x > 0.9. The higher T_c phase, phase-1, emerges in proximity to an antiferromagnetic quantum-critical ... More
Pion-delta sigma-termJul 12 2005We use a configuration space chiral model in order to evaluate nucleon and delta sigma-terms. Analytic expressions are consistent with chiral counting rules and give rise to expected non-analytic terms in the chiral limit. We obtain the results $\sigma_N=46$ ... More
Experimental Observation of Quantum Correlations in Modular VariablesAug 30 2012We experimentally detect entanglement in modular position and momentum variables of photon pairs which have passed through $D$-slit apertures. We first employ an entanglement criteria recently proposed in [Phys. Rev. Lett. {\bf 106}, 210501 (2011)], using ... More
Spin Hall and Edelstein effects in metallic films: from 2D to 3DMar 17 2014A normal metallic film sandwiched between two insulators may have strong spin-orbit coupling near the metal-insulator interfaces, even if spin-orbit coupling is negligible in the bulk of the film. In this paper we study two technologically important and ... More
Two loops calculation in chiral perturbation theory and the unitarization program of current algebraJul 18 1997In this paper we compare two loop Chiral Perturbation Theory (ChPT) calculation of pion-pion scattering with the unitarity second order correction to the current algebra soft-pion theorem. It is shown that both methods lead to the same analytic structure ... More
Rare $β$p decays in light nucleiNov 09 2012Beta-delayed proton emission may occur at very low rates in the decays of the light nuclei $^{11}$Be and $^8$B. This paper explores the potential physical significance of such decays, estimates their rates and reports on first attempts to detect them: ... More
A Note on the Hypercomplex Riemann-Cauchy Like Relations for Quaternions and Laplace EquationsApr 12 2013In this note it is worked out a new set of Laplace-Like equations for quaternions through Riemann-Cauchy hypercomplex relations otained earlier \cite{BorgesZeMarcio}. As in the theory of functions of a complex variable, it is expected that this new set ... More
A Computational Model to Disentangle Semantic Information Embedded in Word Association NormsDec 16 2008Two well-known databases of semantic relationships between pairs of words used in psycholinguistics, feature-based and association-based, are studied as complex networks. We propose an algorithm to disentangle feature based relationships from free association ... More
Influence of the asymmetric excited state decay on coherent population trapping: atom $\times$ quantum dotFeb 24 2017Electromagnetically induced transparency (EIT) is an optical phenomenon which allows a drastic modification of the optical properties of an atomic system by applying a control field. It has been largely studied in the last decades and nowadays we can ... More
Characterizing top gated bilayer graphene interaction with its environment by Raman spectroscopyApr 19 2011In this work we study the behavior of the optical phonon modes in bilayer graphene devices by applying top gate voltage, using Raman scattering. We observe the splitting of the Raman G band as we tune the Fermi level of the sample, which is explained ... More
Positron-neutrino correlation in the 0^+ \to 0^+ decay of ^{32}ArMar 05 1999The positron-neutrino correlation in the $0^+ \to 0^+ \beta$ decay of $^{32}$Ar was measured at ISOLDE by analyzing the effect of lepton recoil on the shape of the narrow proton group following the superallowed decay. Our result is consistent with the ... More
Positron-neutrino correlations in 32Ar and 33Ar Decays: Probes of Scalar weak currents and nuclear isospin mixingApr 01 1999The positron-neutrino correlation in the 0^+ \to 0^+ \beta decay of ^{32}Ar was measured at ISOLDE by analyzing the effect of lepton recoil on the shape of the narrow proton group following the superallowed decay. Our result is consistent with the Standard ... More
Radial abundance gradients in the outer Galactic disk as traced by main-sequence OB starsApr 08 2019Using a sample of 31 main-sequence OB stars located between galactocentric distances 8.4 - 15.6 kpc, we aim to probe the present-day radial abundance gradients of the Galactic disk. The analysis is based on high-resolution spectra obtained with the MIKE ... More
Magnetism and superconductivity in Ce_2RhIn_8Apr 02 2002Jan 20 2003We report the discovery of pressure-induced superconductivity, with T_c=2 K, in the heavy-fermion antiferromagnet Ce_2RhIn_8, where superconductivity and magnetic order coexist over an extended pressure interval. A T-linear resistivity in the normal state, ... More
Non-LTE Abundances in OB stars: Preliminary Results for 5 Stars in the Outer Galactic DiskAug 25 2014The aim of this study is to analyse and determine elemental abundances for a large sample of distant B stars in the outer Galactic disk in order to constrain the chemical distribution of the Galactic disk and models of chemical evolution of the Galaxy. ... More
Evidence of a new state in $^{11}$Be observed in the $^{11}$Li $β$-decayApr 27 2009Coincidences between charged particles emitted in the $\beta$-decay of $^{11}$Li were observed using highly segmented detectors. The breakup channels involving three particles were studied in full kinematics allowing for the reconstruction of the excitation ... More
On the Evolution of Structure in Turbulence PhenomenaSep 29 2013We study the evolution of coherent structures in arbitrary turbulence phenomena, developing some tools, from non-archimedean analysis and algebraic geometry, in order to model its display. We match the scale-dependent, topological structure of the physical ... More
Nuclear structure of Ac-231Aug 06 2008The low-energy structure of 231Ac has been investigated by means of gamma ray spectroscopy following the beta-decay of 231Ra. Multipolarities of 28 transitions have been established by measuring conversion electrons with a mini-orange electron spectrometer. ... More
B[e] Supergiants' circumstellar environment: disks or rings?Oct 03 2016B[e] Supergiants are a phase in the evolution of some massive stars for which we have observational evidence but no predictions by any stellar evolution model. The mass-loss during this phase creates a complex circumstellar environment with atomic, molecular, ... More
Two-Loop Chiral Perturbation Theory and the Pion-Pion Phase ShiftsJun 26 1998We want to test the predictive power of Chiral Perturbation Theory (ChPT). In this work, we use the ChPT pion-pion scattering amplitude, including two loop contributions, and we obtain S- and P-wave low-energy phase shifts. We show that, by varying just ... More
A general framework for applying FGLM techniques to linear codesSep 08 2005We show herein that a pattern based on FGLM techniques can be used for computing Gr\"obner bases, or related structures, associated to linear codes. This Gr\"obner bases setting turns out to be strongly related to the combinatorics of the codes.
On turbulence: deciphering a renormalization flow out of an elliptic curveJan 01 2012Some work in progress is announced, on the use of algebraic geometry, mostly concerning elliptic curve theory, to model turbulence. Attention is given to flows across the scales, on some convenient model space, and some current trials are exposed, where ... More
On turbulence: deciphering a renormalization flow out of an elliptic curve, IIJul 24 2013Reaching for a better understanding of turbulence, a line of investigation was followed, its main presupposition being that each scale dependent state, in a general renormalization flow, is a state that can be modeled using a class of ninth degree polynomials. ... More
Systematic trends in beta-delayed particle emitting nuclei: The case of beta-p-alpha emission from 21MgJun 12 2015We have observed beta+-delayed alpha and p-alpha emission from the proton-rich nucleus 21Mg produced at the ISOLDE facility at CERN. The assignments were cross-checked with a time distribution analysis. This is the third identified case of beta-p-alpha ... More
Disentangling co-occurrence patterns in n-partite ecosystemsJul 12 2018The need to harmonise apparently irreconcilable arrangements in an ecosystem --nestedness and segregation-- has triggered so far different strategies. Methodological refinements, or the inclusion of behavioural preferences to the network dynamics offer ... More
Computing coset leaders of binary codesJan 28 2010We present an algorithm for computing the set of all coset leaders of a binary code $\mathcal C \subset \mathbb{F}_2^n$. The method is adapted from some of the techniques related to the computation of Gr\"obner representations associated with codes. The ... More
On a Grobner bases structure associated to linear codesJun 02 2005We present a structure associated to the class of linear codes. The properties of that structure are similar to some structures in the linear algebra techniques into the framework of the Gr\"obner bases tools. It allows to get some insight in the problem ... More
Beta-delayed proton emission from $^{21}$MgJun 15 2015Beta-delayed proton emission from $^{21}$Mg has been measured at ISOLDE, CERN, with a detection setup including particle identification capabilities. $\beta$-delayed protons with center of mass energies between 0.39$\,$MeV and 7.2$\,$MeV were measured ... More
Generation of higher derivatives operators and electromagnetic wave propagation in a Lorentz-violation scenarioJan 13 2016Mar 18 2016We study the perturbative generation of higher-derivative operators as corrections to the photon effective action, which are originated from a Lorentz violation background. Such corrections are obtained, at one-loop order, through the proper-time method, ... More
Generation of Axion-Like Couplings via Quantum Corrections in a Lorentz Violating BackgroundApr 19 2013Jan 24 2014Light pseudoscalars, or axion like particles (ALPs), are much studied due to their potential relevance to the fields of particle physics, astrophysics and cosmology. The most relevant coupling of ALPs from the viewpoint of current experimental searches ... More
Quantum interference and control of the optical response in quantum dot moleculesNov 16 2013We discuss the optical response of a quantum molecule under the action of two lasers fields. Using a realistic model and parameters, we map the physical conditions to find three different phenomena reported in the literature: the tunneling induced transparency, ... More
Robust states in semiconductor quantum dot moleculesFeb 17 2010Semiconductor quantum dots coherently driven by pulsed laser are fundamental physical systems which allow studying the dynamical properties of confined quantum states. These systems are attractive candidates for a solid-state qubit, which open the possibility ... More
Bistable firing pattern in a neural network modelOct 24 2018Mar 18 2019Excessively high, neural synchronisation has been associated with epileptic seizures, one of the most common brain diseases worldwide. A better understanding of neural synchronisation mechanisms can thus help control or even treat epilepsy. In this paper, ... More
alpha-particle production in the scattering of 6He by 208Pb at energies around the Coulomb barrierMay 11 2007Nov 29 2007New experimental data from the scattering of 6He+208Pb at energies around and below the Coulomb barrier are presented. The yield of breakup products coming from projectile fragmentation is dominated by a strong group of $\alpha$ particles. The energy ... More
Bell-like inequality for spin-orbit separability of a classical laser beamNov 12 2009In analogy with Bell's inequality for two-qubit quantum states we propose an inequality criterion for the non-separability of the spin-orbit degrees of freedom of a classical laser beam. A definition of separable and non-separable spin-orbit modes is ... More
Cerenkov angle and charge reconstruction with the RICH detector of the AMS experimentOct 18 2002The Alpha Magnetic Spectrometer (AMS) experiment to be installed on the International Space Station (ISS) will be equipped with a proximity focusing Ring Imaging Cerenkov (RICH) detector, for measurements of particle electric charge and velocity. In this ... More
Multi-particle emission in the decay of 31ArFeb 19 2014A multi-hit capacity setup was used to study the decay of the dripline nucleus 31Ar, produced at the ISOLDE facility at CERN. A spectroscopic analysis of the beta-delayed three-proton decay of 31Ar is presented for the first time together with a quantitative ... More
Relative proton and gamma widths of astrophysically important states in 30S studied in the beta-decay of 31ArMar 08 2013May 20 2013Resonances just above the proton threshold in 30S affect the 29P(p,gamma)30S reaction under astrophysical conditions. The (p,gamma)-reaction rate is currently determined indirectly and depends on the properties of the relevant resonances. We present here ... More
Charmonia Production at the CERN/SPSMay 20 2005We present the final results of experiment NA50 on charmonia production in Pb-Pb interactions at 158 A GeV. A strong increasing suppression is observed with increasing centrality, for both the jpsi and psiprime resonances. We also present new developments ... More
A position-dependent mass harmonic oscillator and deformed spaceMar 25 2018We consider canonically conjugated generalized space and linear momentum operators $\hat{x}_q$ and $ \hat{p}_q$ in quantum mechanics, associated to a generalized translation operator which produces infinitesimal deformed displacements controlled by a ... More
Using quantum state protection via dissipation in a quantum-dot molecule to solve the Deutsch problemMar 20 2012The wide set of control parameters and reduced size scale make semiconductor quantum dots attractive candidates to implement solid-state quantum computation. Considering an asymmetric double quantum dot coupled by tunneling, we combine the action of a ... More
Families of nested completely regular codes and distance-regular graphsApr 25 2014In this paper infinite families of linear binary nested completely regular codes are constructed. They have covering radius $\rho$ equal to $3$ or $4$, and are $1/2^i$-th parts, for $i\in\{1,\ldots,u\}$ of binary (respectively, extended binary) Hamming ... More
On linear completely regular codes with covering radius $ρ=1$. Construction and classificationJun 02 2009Completely regular codes with covering radius $\rho=1$ must have minimum distance $d\leq 3$. For $d=3$, such codes are perfect and their parameters are well known. In this paper, the cases $d=1$ and $d=2$ are studied and completely characterized when ... More
Completely regular codes by concatenating Hamming codesMar 17 2017We construct new families of completely regular codes by concatenation methods. By combining parity check matrices of cyclic Hamming codes, we obtain families of completely regular codes. In all cases, we compute the intersection array of these codes. ... More
On completely regular and completely transitive codes derived from Hamming codesFeb 20 2019Mar 06 2019Given a parity-check matrix $H_m$ of a $q$-ary Hamming code, we consider a partition of the columns into two subsets. Then, we consider the two codes that have these submatrices as parity-check matrices. We say that anyone of these two codes is the supplementary ... More
Sizeable beta-strength in 31Ar(beta-3p) decayApr 08 2014We present for the first time precise spectroscopic information on the recently discovered decay mode beta-delayed 3p-emission. The detection of the 3p events gives an increased sensitivity to the high energy part of the Gamow-Teller strength distribution ... More
11Be(beta-p), a quasi-free neutron decay?Feb 07 2014We have observed beta-delayed proton emission from the neutron-rich nucleus 11Be by analysing a sample collected at the ISOLDE facility at CERN with accelerator mass spectrometry (AMS). With a branching ratio of (8.4 +- 0.6) 10^{-6} the strength of this ... More
Generalized space and linear momentum operators in quantum mechanicsMay 27 2013We propose a modification of a recently introduced generalized translation operator, by including a $q$-exponential factor, which implies in the definition of a Hermitian deformed linear momentum operator $\hat{p}_q$, and its canonically conjugate deformed ... More
On completely regular and completely transitive codes derived from Hamming codesFeb 20 2019Given a parity-check matrix $H_m$ of a $q$-ary Hamming code, we consider a partition of the columns into two subsets. Then, we consider the two codes that have these submatrices as parity-check matrices. We obtain that if one of these codes is a Hamming ... More
Propelinear structure of Z_{2k}-linear codesJul 30 2009Let C be an additive subgroup of $\Z_{2k}^n$ for any $k\geq 1$. We define a Gray map $\Phi:\Z_{2k}^n \longrightarrow \Z_2^{kn}$ such that $\Phi(\codi)$ is a binary propelinear code and, hence, a Hamming-compatible group code. Moreover, $\Phi$ is the unique ... More
On Completely Regular CodesMar 25 2017This work is a survey on completely regular codes. Known properties, relations with other combinatorial structures and constructions are stated. The existence problem is also discussed and known results for some particular cases are established. In particular, ... More
Approach combining the Rietveld method and pairs distribution function analysis to study crystalline materials under high-pressure and/or temperatureFeb 13 2018An approach combining the Rietveld method and pairs distribution function analysis was developed and can help to understand the effect of temperature and/or high-pressure on crystalline materials. It was applied to orthorhombic Ta2O5 compound, and the ... More
The SPEDE spectrometerSep 21 2017The electron spectrometer, SPEDE, has been developed and will be employed in conjunction with the Miniball spectrometer at the HIE-ISOLDE facility, CERN. SPEDE allows for direct measurement of internal conversion electrons emitted in-flight, without employing ... More
Crossing Symmetry Violation of Unitarized Pion-Pion Amplitude in the Resonance RegionOct 30 2001Pion-pion scattering amplitude obtained from one-loop Chiral Perturbation Theory (ChPT) is crossing symmetric, however the corresponding partial wave amplitudes do not respect exact unitarity relation. There are different approaches to get unitarized ... More
Quantum phase gate Based on Electromagnetically Induced Transparency in Optical CavitiesSep 09 2016We theoretically investigate the implementation of a quantum phase gate in a system constituted by a single atom inside an optical cavity, based on the electromagnetically induced transparency effect. Firstly we show that a probe pulse can experience ... More
Approach combining the Rietveld method and pairs distribution function analysis to study crystalline materials under high-pressure and/or temperature: Application to rhombohedral Bi2Te3 phaseMar 06 2018An approach combining the Rietveld method and pairs distribution function analysis to study crystalline materials under high pressure or temperature was early proposed by us, and in this study, it was applied to investigate de effect of high pressure ... More
The use of the Rietveld method and pairs distribution function analysis to study the pressure dependence of the trigonal SnSe2 and SnS2 structureMar 14 2018A nanostructured trigonal SnSe2 was produced by mechanical alloying, and the effect of high-pressures up to 25.8 GPa on it was investigated. The literature reports refined structural data for SnS2 for pressures up to 20 GPa. These data were used as input ... More
Study of multi-neutron emission in the $β$-decay of $^{11}$LiJun 11 2019The kinematics of two-neutron emission following the $\beta$-decay of $^{11}$Li was investigated for the first time by detecting the two neutrons in coincidence and by measuring their angle and energy. An array of liquid-scintillator neutron detectors ... More
Unitarized pion-nucleon scattering amplitude from inverse amplitude methodOct 12 2002Jan 30 2003In a recent work on low energy pion-nucleon scattering, instead of using chiral perturbation theory (ChPT) amplitude, we started from a pion-nucleon {\it soft-pion} result and used elastic unitarity directly as a dynamical constraint to construct first-order ... More
Unitarized ChPT Amplitudes and Crossing Symmetry ViolationJan 04 2001Pion-pion scattering amplitude obtained from one-loop Chiral Perturbation Theory (ChPT) is crossing symmetric, however the corresponding partial-wave amplitudes do not respect exact unitarity relation. There are different approaches to get unitarized ... More
Pion-Pion Phase-Shifts and the Value of Quark-Antiquark Condensate in the Chiral LimitJan 10 2001We use low energy pion-pion phase-shifts in order to make distinction between the alternatives for the value of the quark-antiquark condensate $B_0$ in the chiral limit. We will consider the amplitude up to and including ${\cal O}(p^4)$ contributions ... More
The Worm CalculusMar 28 2018We present a propositional modal logic $\sf WC$, which includes a logical $verum$ constant $\top$ but does not have any propositional variables. Furthermore, the only connectives in the language of $\sf WC$ are consistency-operators $\langle \alpha \rangle$ ... More
Detection of new eruptions in the Magellanic Clouds LBVs R 40 and R 110Dec 05 2017We performed a spectroscopic and photometric analysis to study new eruptions in two luminous blue variables (LBVs) in the Magellanic Clouds. We detected a strong new eruption in the LBV R40 that reached $V \sim 9.2$ in 2016, which is around $1.3$ mag ... More
Study of beta-delayed 3-body and 5-body breakup channels observed in the decay of ^11LiJun 18 2008The beta-delayed charged particle emission from ^11Li has been studied with emphasis on the three-body n+alpha+^6He and five-body 2alpha+3n channels from the 10.59 and 18.15 MeV states in ^11Be. Monte Carlo simulations using an R-matrix formalism lead ... More
Spin thermoelectrics in a disordered Fermi gasNov 16 2012Feb 14 2013We study the connection between the spin-heat and spin-charge response in a disordered Fermi gas with spin-orbit coupling. It is shown that the ratio between the above responses can be expressed as the thermopower $S=-(\pi k_B)^2T\sigma'/3e\sigma$ times ... More
Symmetry breaking patterns of the 3-3-1 model at finite temperatureFeb 26 2016Jun 28 2016We consider the minimal version of an extension of the standard electroweak model based on the $SU(3)_c \times SU(3)_L \times U(1)_X$ gauge symmetry (the 3-3-1 model). We analyze the most general potential constructed from three scalars in the triplet ... More
Beta-delayed deuteron emission from 11Li: decay of the haloOct 04 2008The deuteron-emission channel in the beta-decay of the halo-nucleus 11Li was measured at the ISAC facility at TRIUMF by implanting post-accelerated 11Li ions into a segmented silicon detector. The events of interest were identified by correlating the ... More
Outbursts and Disk Variability in Be StarsAug 08 2017Jan 23 2018In order to study the growth and evolution of circumstellar disks around classical Be stars, we analyze optical time-series photometry from the KELT survey with simultaneous infrared and visible spectroscopy from the APOGEE survey and BeSS database for ... More
Chronology of the three-body dissociation of $^8$HeJan 04 2018Feb 12 2019The space and time configurations of the dissociation of $^8$He into $^6$He+$n$+$n$, on C and Pb targets, have been explored simultaneously for the first time. The final-state interactions in the $n$-$n$ and $^6$He-$n$ channels are successfully described ... More
Groebner bases and combinatorics for binary codesSep 08 2005In this paper we introduce a binomial ideal derived from a binary linear code. We present some applications of a Gr\"obner basis of this ideal with respect to a total degree ordering. In the first application we give a decoding method for the code. By ... More
An Algebraic View to Gradient Descent DecodingAug 26 2010There are two gradient descent decoding procedures for binary codes proposed independently by Liebler and by Ashikhmin and Barg. Liebler in his paper mentions that both algorithms have the same philosophy but in fact they are rather different. The purpose ... More
Computing coset leaders and leader codewords of binary codesNov 23 2012Nov 03 2014In this paper we use the Gr\"obner representation of a binary linear code $\mathcal C$ to give efficient algorithms for computing the whole set of coset leaders, denoted by $\mathrm{CL}(\mathcal C)$ and the set of leader codewords, denoted by $\mathrm ... More
Deformation of the N=Z nucleus 76Sr using beta-decay studiesFeb 03 2004Apr 26 2004A novel method of deducing the deformation of the N=Z nucleus 76Sr is presented. It is based on the comparison of the experimental Gamow-Teller strength distribution B(GT) from its beta decay with the results of QRPA calculations. This method confirms ... More
Detailed beta-decay study of 33ArJan 15 2010The proton-rich nucleus 33Ar has been studied by detailed proton and gamma-ray spectroscopy at the low-energy facility of SPIRAL at GANIL. Proton and gamma-ray singles and coincidence measurements allowed to establish a quasi complete decay scheme of ... More
Study of bound states in 12Be through low-energy 11Be(d,p)-transfer reactionsAug 28 2013Nov 13 2013The bound states of 12Be have been studied through a 11Be(d,p)12Be transfer reaction experiment in inverse kinematics. A 2.8 MeV/u beam of 11Be was produced using the REX-ISOLDE facility at CERN. The outgoing protons were detected with the T-REX silicon ... More
Inhomogeneous molecular ring around the B[e] supergiant LHA 120-S 73Jul 01 2016We aim to improve our knowledge on the structure and dynamics of the circumstellar disk of the LMC B[e] supergiant LHA 120-S 73. High-resolution optical and near-IR spectroscopic data were obtained over a period of 16 and 7 years, respectively. The spectra ... More
He II 4686 in eta Carinae: collapse of the wind-wind collision region during periastron passageApr 12 2011Nov 21 2011The periodic spectroscopic events in eta Carinae are now well established and occur near the periastron passage of two massive stars in a very eccentric orbit. Several mechanisms have been proposed to explain the variations of different spectral features, ... More
An infrared diagnostic for magnetism in hot starsMay 07 2015Magnetospheric observational proxies are used for indirect detection of magnetic fields in hot stars in the X-ray, UV, optical, and radio wavelength ranges. To determine the viability of infrared (IR) hydrogen recombination lines as a magnetic diagnostic ... More
The AMS-02 RICH Imager Prototype - In-Beam Tests with 20 GeV/c per Nucleon Ions -Jun 11 2003A prototype of the AMS Cherenkov imager (RICH) has been tested at CERN by means of a low intensity 20 GeV/c per nucleon ion beam obtained by fragmentation of a primary beam of Pb ions. Data have been collected with a single beam setting, over the range ... More
Enhanced Halpha activity at periastron in the young and massive spectroscopic binary HD200775Jun 03 2013Young close binaries clear central cavities in their surrounding circumbinary disk from which the stars can still accrete material. This process takes place within the very first astronomical units, and is still not well constrained as the observational ... More
Chimera in a neuronal network model of the cat brainSep 03 2016Neuronal systems have been modeled by complex networks in different description levels. Recently, it has been verified that networks can simultaneously exhibit one coherent and other incoherent domain, known as chimera states. In this work, we study the ... More
Chimera in a neuronal network model of the cat brainSep 03 2016Feb 02 2017Neuronal systems have been modeled by complex networks in different description levels. Recently, it has been verified that networks can simultaneously exhibit one coherent and other incoherent domain, known as chimera states. In this work, we study the ... More
A new observational tracer for high-density disc-like structures around B[e] supergiantsMar 30 2012The disc formation mechanism of B[e] supergiants is one of the puzzling phenomena in massive star evolution. Rapid stellar rotation seems to play an important role for the non-spherically symmetric mass-loss leading to a high-density disc or ring-like ... More
Longitudinal momentum distributions of {16,18}C fragments after one-neutron removal from {17,19}COct 16 1998Oct 21 1998The fragment separator FRS at GSI was used as an energy-loss spectrometer to measure the longitudinal momentum distributions of {16,18}C fragments after one-neutron removal reactions in {17,19}C impinging on a carbon target at about 910 MeV/u. The distributions ... More
The Halo of 14BeJun 07 2000The two-neutron halo nucleus 14Be has been investigated in a kinematically complete measurement of the fragments (12Be and neutrons) produced in dissociation at 35 MeV/nucleon on C and Pb targets. Two-neutron removal cross-sections, neutron angular distributions ... More
Topological effects of data incompleteness of gene regulatory networksFeb 16 2012The topological analysis of biological networks has been a prolific topic in network science during the last decade. A persistent problem with this approach is the inherent uncertainty and noisy nature of the data. One of the cases in which this situation ... More
New families of completely transitive codes and distance transitive graphsApr 08 2013In this paper new infinite families of linear binary completely transitive codes are presented. They have covering radius $\rho = 3$ and 4, and are a half part of the binary Hamming and the binary extended Hamming code of length $n=2^m-1$ and $2^m$, respectively, ... More
Unveiling the structure and kinematics of B[e] stars' disks from FEROS and CRIRES spectraDec 19 2012We are investigating the circumstellar material for a sample of B[e] stars using high spectral resolution data taken in the optical and near-infrared regions with ESO/FEROS and ESO/CRIRES spectrographs, respectively. B[e] stars are surrounded by dense ... More
Inhomogeneous Fokker-Planck equation as an homogeneous one from deformed derivative frameworkJun 06 2018We present the Fokker-Planck equation (FPE) for an inhomogeneous medium with a position-dependent mass particle by making use of the Langevin equation in the context of an algebra inspired in nonextensive statistics. We show that the FPE for an inhomogeneous ... More
Shapes of the $^{192,190}$Pb ground states from beta decay studies using the total absorption techniqueJul 25 2015Jul 31 2015The beta decay of $^{192,190}$Pb has been studied using the total absorption technique at the ISOLDE(CERN) facility. The beta-decay strength deduced from the measurements, combined with QRPA theoretical calculations, allow us to infer that the ground ... More
Hydrogen neutral outflowing disks of B[e] supergiantsFeb 14 2007The [O I] line emission of the LMC B[e] supergiant R126 is modeled with an outflowing disk scenario. We find that hydrogen in the disk must be ionized by less than 0.1%, meaning that the disk material is predominantly neutral. The free-free emission is ... More
The $^{13}$Carbon footprint of B[e] supergiantsJul 08 2010We report on the first detection of $^{13}$C enhancement in two B[e] supergiants in the Large Magellanic Cloud. Stellar evolution models predict the surface abundance in $^{13}$C to strongly increase during main-sequence and post-main sequence evolution ... More
Vector- and Scalar-Bilepton Pair Production in Hadron CollidersMar 07 2011We study the double-charged vector-bilepton pair production and double-charged scalar-bilepton pair production {\it via} $p + p \longrightarrow Y^{++} + Y^{--} + X$ and $p + p \longrightarrow S_1^{++} + S_1^{--} + X$, where $Y$ and $S_1$ are vector and ... More
Supernova constraints on decaying vacuum cosmologyMay 24 2006Jul 04 2006There is mounting observational evidence that the expansion of our Universe is undergoing a late-time acceleration. Among many proposals to describe this phenomenon, the cosmological constant seems to be the simplest and the most natural explanation. ... More
Blood Pulsation Intensity Video MappingNov 10 2016In this study, we make non-invasive, remote, passive measurements of the heart beat frequency and determine the map of blood pulsation intensity in a region of interest (ROI) of skin. The ROI used was the forearm of a volunteer. The method employs a regular ... More