2,096 research outputs found

    Desarrollo, implementacioĢn y publicacioĢn de un sistema geograĢfico para la gestioĢn vial del cantoĢn Cuenca

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    En la ciudad de Cuenca, el aumento del parque automotor conlleva un problema de congestioĢn vehicular, a esto contribuye el cierre de viĢas por mejoras en la ciudad, estas circunstancias han provocado un malestar en los usuarios de sistemas puĢblicos y privados de transporte, agravando el estreĢs urbano como consecuencia de la contaminacioĢn, el aumento de los tiempos de viaje,repercutiendo de forma econoĢmica y social en la poblacioĢn de Cuenca. Disponer de mapas y cartografiĢa vial accesible desde dispositivos moĢviles como celulares, GPS, tablets, PDA, permite tener alternativas de circulacioĢn y brinda herramientas para generar rutas alternas para llegar a un destino. Una propuesta de gran acogida es la iniciativa Openstreetmap, la cual busca generar mapas viales del mundo a traveĢs de aportes hechos por usuarios entusiastas que usan las capturas de datos de GPS en el terreno, para luego ingresarla a la web. Algo similar se ha puesto en funcionamiento en la plataforma de la Universidad del Azuay con la informacioĢn cartograĢfica vial actualizada y depurada a nivel 2, lo que representa viĢas principales y secundarias en diferentes formatos para su descarga. Este sitio tambieĢn tiene accesos a los diferentes portales que disponen de informacioĢn cartograĢfica vial

    The Hatch Dairy Experiment Station Farm

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    A Mississippian Flora from Northeastern Utah and Its Faunal and Stratigraphic Relations

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    241-263http://deepblue.lib.umich.edu/bitstream/2027.42/48360/2/ID203.pd

    Silage investigations : loss of nutrients in the silo and during the field curing of corn

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    Publication authorized December 13 1923.Digitized 2007 AES.Includes bibliographical references (pages 9-10)

    A comparison of Jersey sires : based on the average mature equivalent fat production of the daughters

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    Official testing of dairy cattle

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    Caption title.Digitized 2006 AES MoU

    Bose-Einstein Condensation in a Harmonic Potential

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    We examine several features of Bose-Einstein condensation (BEC) in an external harmonic potential well. In the thermodynamic limit, there is a phase transition to a spatial Bose-Einstein condensed state for dimension D greater than or equal to 2. The thermodynamic limit requires maintaining constant average density by weakening the potential while increasing the particle number N to infinity, while of course in real experiments the potential is fixed and N stays finite. For such finite ideal harmonic systems we show that a BEC still occurs, although without a true phase transition, below a certain ``pseudo-critical'' temperature, even for D=1. We study the momentum-space condensate fraction and find that it vanishes as 1/N^(1/2) in any number of dimensions in the thermodynamic limit. In D less than or equal to 2 the lack of a momentum condensation is in accord with the Hohenberg theorem, but must be reconciled with the existence of a spatial BEC in D=2. For finite systems we derive the N-dependence of the spatial and momentum condensate fractions and the transition temperatures, features that may be experimentally testable. We show that the N-dependence of the 2D ideal-gas transition temperature for a finite system cannot persist in the interacting case because it violates a theorem due to Chester, Penrose, and Onsager.Comment: 34 pages, LaTeX, 6 Postscript figures, Submitted to Jour. Low Temp. Phy
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