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Search Results: 1 - 10 of 2002 matches for " Ivelisse Figueroa "
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Exportaciones de rana catesbeiainay bufo marinus durante el período del 10 de enero de 1994 al 7 de octubre de 1999
Delsi de los Santos,Ivelisse Figueroa
Ciencia y Sociedad , 2001,
Discusión y comentarios sobre la última ponencia
Fabio Abreu,Ivelisse Prats,Minerva Vincent,Marta Vicente
Ciencia y Sociedad , 2000,
"Quasi-particle breakdown" in the quasi-one-dimensional Ising ferromagnet CoNb$_2$O$_6$
Neil J. Robinson,Fabian H. L. Essler,Ivelisse Cabrera,Radu Coldea
Physics , 2014, DOI: 10.1103/PhysRevB.90.174406
Abstract: We present experimental and theoretical evidence that an interesting quantum many-body effect -- quasi-particle breakdown -- occurs in the quasi-one-dimensional spin-1/2 Ising-like ferromagnet CoNb$_2$O$_6$ in its paramagnetic phase at high transverse field as a result of explicit breaking of spin inversion symmetry. We propose a quantum spin Hamiltonian capturing the essential one-dimensional physics of CoNb$_2$O$_6$ and determine the exchange parameters of this model by fitting the calculated single particle dispersion to the one observed experimentally in applied transverse magnetic fields. We present high-resolution inelastic neutron scattering measurements of the single particle dispersion which observe "anomalous broadening" effects over a narrow energy range at intermediate energies. We propose that this effect originates from the decay of the one particle mode into two-particle states. This decay arises from (i) a finite overlap between the one-particle dispersion and the two-particle continuum in a narrow energy-momentum range and (ii) a small misalignment of the applied field away from the direction perpendicular to the Ising axis in the experiments, which allows for non-zero matrix elements for decay by breaking the $\mathbb{Z}_2$ spin inversion symmetry of the Hamiltonian.
Spectral and Finite Difference Solutions of the Hyperbolic Heat Transport Equation for Thermoelectric Thin Films  [PDF]
Aldo Figueroa, Federico Vázquez
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.410A3004

This paper presents the numerical comparison in the solution of the hyperbolic transport Equation that models the heat flux in thermoelectric materials at nanometric length scales when the wave propagation of heat dominates the diffusive transport described by Fourier’s law. The widely used standard finite difference method fails in well-reproducing some of the physics presented in such systems at that length scale level. As an alternative, the spectral methods assure a well representation of wave behavior of heat given their spectral convergence.

The Study on the Flow Generated by an Array of Four Flettner Rotors: Theory and Experiment  [PDF]
Fernando Garzón, Aldo Figueroa
Applied Mathematics (AM) , 2017, DOI: 10.4236/am.2017.812132
We present an immersed array of four rotors whose promoted flow can be mathematically modeled with a creeping flow solution from the incompressible Navier-Stokes equations. We show that this solution is indeed representative of the two-dimensional experiment and validate such class of solution with experimental data obtained through the Particle Image Velocimetry technique and time-lapsed particles visualizations.
Transporte urbano y globalización: Políticas y efectos en América Latina
EURE (Santiago) , 2005, DOI: 10.4067/S0250-71612005009400003
Abstract: globalization and liberal policies that have affected city functioning have also affected the behavior of urban transports. urban expansion and new economic insertion processes, and their expression in cities, have been fully accompanied by a transport system that has assumed a functional role to this development. new urban transports organization and functioning trends reveal precisely an institutional, politic and operative transformation that serves as a functional support to urban demands and urban developments trends. processes like systems' disaggregation, the generation of supply special segments oriented to population solvent demands, as well as the generation of conditions for supporting urban expansion, are all new features that transport system has been able to assume, according to the new general trends of latin american economies and cities
A generalized labor market theory: inequality as labor discipline device
Figueroa, Adolfo;
Investigación económica , 2011,
Abstract: the standard microeconomic theory of labor market assumes that unemployment operates as the labor discipline device in advanced countries. what is this device in developing countries? this paper seeks to give an answer to this question by constructing a new theoretical model and by confronting its predictions against a set of empirical regularities that characterize the functioning of labor markets in developing countries. in comparing the two models, the paper shows the existence of a generalized labor market theory in which inequality among workers constitutes the common labor discipline device, which just takes different forms in advanced and developing countries.
La evaluación: del pasado al presente
Educere , 2007,
Abstract: la educación venezolana ha sufrido transformaciones profundas. en el pasado, predominó la ense?anza teológica y el aprendizaje memorístico y repetitivo. el maestro era considerado un experto que emitía juicios a partir de pruebas orales, escritas o experimentales. hoy, gracias a los paradigmas cualitativo y cuantitativo de la evaluación y al marco legal actual, la educación venezolana ha evolucionado a partir del desarrollo de nuevos tipos, formas y estrategias de evaluación
La ética médica a comienzos del siglo XX: "La Monta?a Mágica" de Thomas Mann
Acta bioethica , 2011, DOI: 10.4067/S1726-569X2011000200007
Abstract: bioethics has deeply transformed medical ethics, appealing to other principles and practices. the present work tries to understand traditional western medical ethics by recurring to its description in artistic narrative, because this describes with special quality and rigor the way it was understood and practiced before the bioethics turn. the work of thomas mann "the magic mountain" was chosen because, besides its intrinsic value, its point of view clears other moral foundations which could have been mal interpreted, disqualified or lost in the last years. thus, the ethics of goodness predominated over the ethics of duty, the good life over obligation, self esteem over respect for the other, maximum achieved over minimum required. the acid critiques expressed by the omniscient narrator insinuate that this way of understanding moral behavior in medicine needs to complement other ethical views.
La escritura de la ciudad para el establecimiento de la nación, y la generación de mitos históricos en El Movimiento Literario de 1842: Bello, Lastarria, Sarmiento
Estudios filológicos , 2002, DOI: 10.4067/S0071-17132002003700013
Abstract: in 1840, chilean intellectuals began to develop and consolidate ways of thinking about themselves as important and key players in the organization of the state because they have the possibility of create an imaginary community. thanks to the presence of andrés bello, domingo faustino sarmiento and josé mora. these writers came to chile after escaping dictatorships in their own countries, so they attempted to create a state based on models which reflect their conception of power. it is a process of modernity that tries to generate a language which reflects the ideals of citizenship, homeland, nation and writing. in this work i would like to examine just how the discursive project of the intellectual of 1842 worked.
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