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Search Results: 1 - 10 of 171878 matches for " E.;Martinez "
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Variables asociadas con la involucración en el trabajo
Miguel. E. Martinez Lugo
Revista Latinoamericana de Psicología , 1990,
Abstract: The relationshíp between job involvement and a series of organizatíonal variables was examíned in a group of 174 participants. The findings show a positive and significant correlation between [ob involvement and peer cohesíon, supervisor support, autonomy, clarity, innovation, physical comfort, and job satisfaction. A no significantcorrelation was found between job involvement and organízatíonal commitment
Soft-Photons and the entanglement of charged qubtis
E. Martin-Martinez
Physics , 2008,
Abstract: In this work, I consider the effect of the unavoidable presence of soft-photons on the spin entanglement of charged qubits, arguing that the spin entanglement is not modified if we consider the effects of the infrared structure of QED on it.
Relativistic Quantum Information: developments in Quantum Information in general relativistic scenarios
E. Martin-Martinez
Physics , 2011,
Abstract: Recently, there has been increased interest in understanding entanglement and quantum communication in black hole spacetimes and in using quantum information techniques to address questions in gravity. Studies on relativistic entanglement show the emergence of conceptually important qualitative differences to a non-relativistic treatment. For instance, entanglement was found to be an observer-dependent property that changes from the perspective of accelerated observers moving in flat spacetime. Relativisitic quantum information theory uses well-known tools coming from quantum information and quantum optics to study quantum effects provoked by gravity to learn information about the spacetime. We can take advantage of our knowledge about quantum correlations and effects produced by the gravitational interaction to set the basis for experimental proposals ultimately aiming at finding corrections due to quantum gravity effects, too mild to be directly observed. This doctoral thesis dissertation summarises most of the research carried out during my PhD on this topic.
Possibilities of MgB2/Cu Wires Fabricated by the in-situ Reaction Technique
E. Martinez,R. Navarro
Physics , 2003,
Abstract: The superconducting properties of copper-sheathed MgB2 wires fabricated by conventional powder-in-tube techniques and the in-situ reaction procedure are analysed. The influence of the processing conditions and initial (1+x)Mg + 2B (x = 0, 0.1, 0.2) proportions of the precursors on the critical current values of the wires have been studied. In particular, the limits of the available temperatures and times for heat treatments imposed by the chemical reaction between Mg and Cu, and their effect on the superconducting properties of the wires, are discussed. The analysis includes the study of the sample microstructure and phase composition as well as of the critical current temperature and field dependences. The wires show high thermal stability during direct transport measurements and carry a critical current density of 1.3x109 A/m2 at 15 K in the self-field for optimised processing conditions.
Learning class-to-class selectional preferences
E. Agirre,D. Martinez
Computer Science , 2001,
Abstract: Selectional preference learning methods have usually focused on word-to-class relations, e.g., a verb selects as its subject a given nominal class. This papers extends previous statistical models to class-to-class preferences, and presents a model that learns selectional preferences for classes of verbs. The motivation is twofold: different senses of a verb may have different preferences, and some classes of verbs can share preferences. The model is tested on a word sense disambiguation task which uses subject-verb and object-verb relationships extracted from a small sense-disambiguated corpus.
The double scaling limit method in the Toda hierarchy
L. Martinez Alonso,E. Medina
Physics , 2008, DOI: 10.1088/1751-8113/41/33/335202
Abstract: Critical points of semiclassical expansions of solutions to the dispersionful Toda hierarchy are considered and a double scaling limit method of regularization is formulated. The analogues of the critical points characterized by the strong conditions in the Hermitian matrix model are analyzed and the property of doubling of equations is proved. A wide family of sets of critical points is introduced and the corresponding double scaling limit expansions are discussed.
Regularization of Hele-Shaw flows, multiscaling expansions and the Painleve I equation
Luis Martinez Alonso,E. Medina
Physics , 2007,
Abstract: Critical processes of ideal integrable models of Hele-Shaw flows are considered. A regularization method based on multiscaling expansions of solutions of the KdV and Toda hierarchies characterized by string equations is proposed. Examples are exhibited in which the tritronq'ee solution of the Painleve-I equation turns out to provide the leading term of the regularization
Multiple orthogonal polynomials, string equations and the large-n limit
L. Martinez Alonso,E. Medina
Physics , 2008,
Abstract: The Riemann-Hilbert problems for multiple orthogonal polynomials of types I and II are used to derive string equations associated to pairs of Lax-Orlov operators. A method for determining the quasiclassical limit of string equations in the phase space of the Whitham hierarchy of dispersionless integrable systems is provided. Applications to the analysis of the large-n limit of multiple orthogonal polynomials and their associated random matrix ensembles and models of non-intersecting Brownian motions are given.
SClib, a hack for straightforward embedded C functions in Python
Esteban Fuentes,Hector E. Martinez
Physics , 2014,
Abstract: We present SClib, a simple hack that allows easy and straightforward evaluation of C functions within Python code, boosting flexibility for better trade-off between computation power and feature availability, such as visualization and existing computation routines in SciPy. We also present two cases were SClib has been used. In the first set of applications we use SClib to write a port to Python of a Schr\"odinger equation solver that has been extensively used the literature, the resulting script presents a speed-up of about 150x with respect to the original one. A review of the situations where the speeded-up script has been used is presented. We also describe the solution to the related problem of solving a set of coupled Schr\"odinger-like equations where SClib is used to implement the speed-critical parts of the code. We argue that when using SClib within IPython we can use NumPy and Matplotlib for the manipulation and visualization of the solutions in an interactive environment with no performance compromise. The second case is an engineering application. We use SClib to evaluate the control and system derivatives in a feedback control loop for electrical motors. With this and the integration routines available in SciPy, we can run simulations of the control loop a la Simulink. The use of C code not only boosts the speed of the simulations, but also enables to test the exact same code that we use in the test rig to get experimental results. Again, integration with IPython gives us the flexibility to analyze and visualize the data.
Critical view of the claimed $Θ^+$ pentaquark
E. Oset,A. Martinez Torres
Physics , 2010, DOI: 10.1063/1.3574993
Abstract: We use a theoretical model of the $\gamma ~d \to ~K^+ K^- ~n ~p $ reaction adapted to the experiment done at LEPS where a peak was observed and associated to the $\Theta^{+}(1540)$ pentaquark. The study shows that the method used in the experiment to associate momenta to the undetected proton and neutron, together with the chosen cuts, necessarily creates an artificial broad peak in the assumed $K^+ n$ invariant mass in the region of the claimed $\Theta^{+}(1540)$. It is shown that the LEPS fit to the data, used to make the claim of the $\Theta^{+}(1540)$, grossly distorts the background. An alternative fit, assuming a background plus a fluctuation, returns a background practically equal to the theoretical one and a fluctuation identical to the one seen in the experimental $K^- p$ spectrum of 2$\sigma$ significance.
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