Examinando por Materia "Critical point"

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    Ítem
    Critical Constants Correlation from van der Waals Equation
    (Universidad EAFIT, 2019-11-29) Martínez Vitela, Mario Alberto; Gracia Fadrique, Jesús; Universidad Nacional Autónoma de México
    The cubic van der Waals equation of state at the critical condition is reduced to a linear function (Vc vs. Tc /Pc coordinates) with one adjustable parameter. It is shown that at the critical point the relation Vc = 3Vo must not hold as van der Waals suggested, but the attractive constant α = Pc Vc2 remains. Selected values of Tc, Pc, Vc compiled by Ihmels where focused on testing the quality of several empirical equations relating critical conditions. It is shown that the obtained critical constants correlation is a general form of the empirical expressions proposed by Young, Meissner, Bird, Grigoras and Ihmels. From the resulting correlation function, a function for the critical compressibility is proposed. The critical volume Vc and the ratio Tc /Pc have been expressed in group contributions.
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    Ítem
    On The Critical Point Structure of Eigenfunctions Belonging to the First Nonzero Eigenvalue of a Genus Two Closed Hyperbolic Surface
    (Science Journal Publication, 2012-05-01) Carlos A. Cadavid; Osorno, María C.; Ruiz OE; Carlos A. Cadavid; Osorno, María C.; Ruiz OE; Universidad EAFIT. Departamento de Ciencias; Matemáticas y Aplicaciones
    We develop a method based on spectral graph theory to approximate the eigenvalues and eigenfunctions of the Laplace-Beltrami operator of a compact riemannian manifold. The method is applied to a closed hyperbolic surface of genus two
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    Ítem
    On The Critical Point Structure of Eigenfunctions Belonging to the First Nonzero Eigenvalue of a Genus Two Closed Hyperbolic Surface
    (Science Journal Publication, 2012-05-01) Carlos A. Cadavid; Osorno, María C.; Ruiz OE; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAE
    We develop a method based on spectral graph theory to approximate the eigenvalues and eigenfunctions of the Laplace-Beltrami operator of a compact riemannian manifold. The method is applied to a closed hyperbolic surface of genus two