Browsing Artículos 2014 by Issue Date
Now showing items 21-40 of 106
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Some totally geodesic submanifolds of the nonlinear Grassmannian of a compact symmetric space
(2014)Let M and N be two connected smooth manifolds, where M is compact and oriented and N is Riemannian. Let E be the Fréchet manifold of all embeddings of M in N, endowed with the canonical weak Riemannian metric. Let ∼ be the ... -
The Brauer-Picard group of the representation category of finite supergroup algebras
(2014)We develop further the techniques presented in a previous article (M. Mombelli. Abh. Math. Semin. Univ. Hamb. 82 (2012), 173–192), to study bimodule categories over the representation categories of arbitrary finite-dimensional ... -
The index of symmetry of compact naturally reductive spaces
(2014)We introduce a geometric invariant that we call the index of symmetry, which measures how far is a Riemannian manifold from being a symmetric space. We compute, in a geometric way, the index of symmetry of compact naturally ... -
Generalization of entropy based divergence measures for symbolic sequence analysis
(2014)Entropy based measures have been frequently used in symbolic sequence analysis. A symmetrized and smoothed form of Kullback-Leibler divergence or relative entropy, the Jensen-Shannon divergence (JSD), is of particular ... -
Geometric formulation of the uncertainty principle
(2014)A geometric approach to formulate the uncertainty principle between quantum observables acting on an N-dimensional Hilbert space is proposed. We consider the fidelity between a density operator associated with a quantum ... -
Virtual laboratory for a first experience in dynamics
(2014)New technologies contribute to the learning process of scientific disciplines. In particular Physics learning may take advantage of these techniques by implementing experimental practices in simulation environments. Our ... -
A posteriori error estimates for elliptic problems with Dirac measure terms in weighted spaces
(2014)In this article we develop a posteriori error estimates for second order linear elliptic problems with point sources in two- and three-dimensional domains. We prove a global upper bound and a local lower bound for the error ... -
Magnitude modelling of HRTF using principal component analysis applied to complex values
(2014)Principal components analysis (PCA) is frequently used for modelling the magnitude of the head related transfer functions (HRTFs). Assuming that the HRTFs are minimum phase systems, the phase is obtained from the Hilbert ... -
Study of lead levels in soils by weathering of metallic Pb bullets used in dove hunting in Córdoba, Argentina
(2014)A study of level of Pb in soils of the center-north of the Province of Córdoba, a worldwide recognized tourist region for dove hunting, was performed in this work. The native forest of the region has a great population ... -
Study of the characteristic parameters of the normal voices of Argentinian speakers
(2014)The voice laboratory permits to study the human voices using a method that is objective and noninvasive. In this work, we have studied the parameters of the human voice such as pitch, formant, jitter, shimmer and harmonic-noise ... -
Intrinsic angular momentum for radiating spacetimes which agrees with the Komar integral in the axisymmetric case
(2014)Here, we present a new definition of intrinsic angular momentum at future null infinity, based on the charge-integral approach. This definition is suitable for the general case of radiating spacetimes without symmetries, ... -
Methods and results of a search for gravitational waves associated with gamma-ray bursts using the GEO 600, LIGO, and Virgo detectors
(2014)In this paper we report on a search for short-duration gravitational wave bursts in the frequency range 64 Hz–1792 Hz associated with gamma-ray bursts (GRBs), using data from GEO 600 and one of the LIGO or Virgo detectors. ... -
Landau-Zener and Rabi oscillations in the spin-dependent conductance
(2014)We describe the spin-dependent quantum conductance in a wire where a magnetic field is spatially modulated. The changes in direction and intensity of the magnetic field acts as a perturbation that mixes spin projections. ... -
Lightning in Western Patagonia
(2014)On the basis of 8 years (2005-2012) of stroke data from the World Wide Lightning Location Network we describe the spatial distribution and temporal variability of lightning activity over Western Patagonia. This region ... -
Interfaz visual para un Autocolimador Nikon 6D mediante procesamiento de imágenes con precisión sub-píxel : un caso de estudio
(2014)Este documento tiene el objetivo de describir el potencial de una interfaz visual básica en un Autocolimador del tipo Nikon 6B/6D, para reemplazar al operario en una medición de calidad metrológica. La interfaz visual ... -
Neo y paleoornitología virtual
(2014)La visualización y análisis de los fósiles asistido por computadoras ha revolucionado el estudio de los organismos extintos. Técnicas novedosas permiten caracterizar los restos en tres dimensiones y acceder a detalles sin ... -
Magnetite NPs@C with highly-efficient peroxidase-like catalytic activity as an improved biosensing strategy for selective glucose detection
(2014)This work reports the novel application of carbon-coated magnetite nanoparticles (mNPs@C) as catalytic nanomaterial included in a composite electrode material (mNPs@C/CPE) taking advantages of their intrinsic peroxidase-like ... -
La actividad eléctrica atmosférica en Argentina : estimación de la tasa de mortalidad anual por acción de caídas de rayos
(2014)Disponer de información de la actividad eléctrica en el territorio nacional es un elemento fundamental para la vigilancia atmosférica. Tanto para aplicaciones de relevancia, en cuestiones de seguridad e infraestructura, ... -
A pair production telescope for medium-energy gamma-ray polarimetry
(2014)We describe the science motivation and development of a pair production telescope for medium-energy (∼5–200 MeV) gamma-ray polarimetry. Our instrument concept, the Advanced Energetic Pair Telescope (AdEPT), takes advantage ... -
Experimental determination of L X-ray fluorescence cross sections for elements with 45 < Z < 50 at 10 keV
(2014)Synchrotron radiation at 10 keV was used to experimentally determine the Ll, La, LbI ,LbII , LgI and LgII fluorescence cross sections for elements with 45 < Z < 50, as part of an ongoing investigation at low energies. The ...
