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Browsing Física by Title

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  • Orientational order phase transition in solid C-60
    Calles, A; Soto, JR; Valladares, R (1998)
    The phonon spectrum and thermal parameters such as specific heat, effective temperature and amplitude of vibration of solid C-60 are studied from ab-initio calculations. The relative orientations between the C-60 balls are ...
  • Oscillatory heat transfer process in a vertical strip immersed in a porous medium
    Contreras, I; Prince, JC; Treviño, C (2004)
    In this work, the transient conjugated heat transfer characteristics of a thin long vertical strip embedded in a porous medium has been studied using numerical and asymptotic techniques. The oscillatory nondimensional ...
  • PAIRING THEORY AND DIRAC SUPERSYMMETRY
    MORENO, M; MENDEZMORENO, RM; OROZCO, S; ORTIZ, MA (1994)
    A pairing theory is obtained within a Dirac supersymmetric framework. Admixtures of triplet and singlet pairing systems are shown to posses Dirac supersymmetry for a two component (heavy) fermion. Application of this ...
  • Particle image velocimetry measurements for opposing flow in a vertical channel with a differential and asymmetric heating condition
    Martínez-Suastegui, L; Treviño, C (2007)
    Particle image velocimetry (PIV) measurements were carried out in an experimental investigation of laminar mixed convection in a vertical duct with a square cross-section. The main downward water-flow is driven by gravity ...
  • Partículas elementales y las interacciones básicas
    Méndez, R M (Las Prensas de Ciencias, 2002)
    Dirigido fundamentalmente a estudiantes de bachillerato y de los primeros semestres de licenciatura, esta obra presenta de manera sencilla y amena uno de los temas más importantes en los cursos de física moderna.
  • PERIODIC-FLOW IN THE NEAR WAKE OF STRAIGHT CIRCULAR-CYLINDERS
    PLASCHKO, P; BERGER, E; PERALTAFABI, R (1993)
    The formation of periodic waves in the near wake of straight circular cylinders with arbitrary aspect ratios in crosswise flows at low Reynolds numbers (Re) is analyzed. Using a semiempirical model it is shown that raising ...
  • Persistence effects in deterministic diffusion
    Gilbert, T; Sanders, D (2009)
    In systems that exhibit deterministic diffusion, the gross parameter dependence of the diffusion coefficient can often be understood in terms of random-walk models. Provided the decay of correlations is fast enough, one ...
  • Perspectives on nuclear mass formulae
    Barea, J; Frank, A; Hirsch, JG; Van Isacker, P; Mendoza-Temis, J; Morales, I; Pittel, S; López-Vieyra, JC; Velázquez, VM (2008)
    We discuss different nuclear mass tables (experimental and calculated) in the context of the Garvey-Kelson relations and show how these relations can provide a very useful tool to test and improve the consistency of the models.
  • Phase transitions and accidental degeneracy in nonlinear spin systems
    Castanos, O; Hirsch, JG; López-Pena, R; López-Moreno, E (2005)
    A characterization of phase transitions and related accidental degeneracies is presented for a general spin Hamiltonian containing linear and quadratic terms. The existence of first-, second-, and third-order phase transitions ...
  • Philosophiae Naturalis Principia Mathematica: Its mathematical structure
    Marquina, JE; Ridaura, R; Gomez, R; Alvarez, JL; Marquina, V (1996)
    We analyze the mathematical formulations used by Newton in his Philosophiae Naturalis Principia. Mathematica. Apparently, Newton intentionally omitted in all his book the use of the fluxional analysis that he developed. ...
  • PHONON CONTRIBUTION FOR THE LOW-TEMPERATURE SPECIFIC-HEAT OF SOLID C-60 AND K3C60
    CASTRO, JJ; Soto y Montiel, José Rafael; Yépez, E; Calles, A; Cabrera, A (1994)
    We present the result of a theoretical analysis of the phonon contribution to the specific heat for both pure C-60 and alkaline doped K3C60 fullerenes. This is based on the construction of the phonon density of states ...
  • Platícame de física. Cuento sobre la física en lo cotidiano
    Méndez, R M (Las Prensas de Ciencias, 2002)
    Dirigido fundamentalmente a estudiantes de bachillerato y de los primeros semestres de licenciatura, esta obra presenta de manera sencilla y amena uno de los temas más importantes en los cursos de física moderna.
  • Polymer transport in random potentials and the genetic code: The waltz of life
    Cocho, G; Larralde, H; Martínez-Mekler, G; Aldana-González, M (2003)
    We address the question of why the translation from nucleic acids to protein forming amino acids is carried out by triplets known as codons. We approach this problem from a dynamical point of view by considering the ...
  • Polymerization of commercial Mexican sulfur
    Gomez, RW; Perez, JL; Ridaura, R; Marquina, V; Marquina-Fábrega, María Luisa (2007)
    As it is well known, the physical characteristics of sulfur exhibit a wide range of interesting phenomena around 160 degrees C [1]: a) A shear viscosity change of four orders of magnitude over a 25 degrees C interval [2]. ...
  • Precursors of long-range order and local disorder in colloids
    Mayorga, M; Romero-Salazar, L; Rubi, JM; Osorio-González, D; Santamaria, I (2009)
    We show the existence of precursors of crystalline and amorphous phases preceding the appearance of freezing and glass transitions in colloidal systems. The formation of crystalline clusters or amorphous local arrangements ...
  • Predicting nuclear masses by image reconstruction
    Morales, I; Frank, A; Barea, J; Hirsch, JG; Van Isacker, P; López-Vieyra, JC; Velázquez, VM (2006)
    The differences between measured masses and Liquid Drop Model (LDM) predictions have well known regularities, which can be analyzed as a two-dimensional texture on the N-Z plane. The remaining microscopic effects, obtained ...
  • PREMARTENSITIC PHASE-TRANSFORMATION IN A TINIFE SHAPE MEMORY ALLOY STUDIED BY MOSSBAUER-SPECTROSCOPY
    GOMEZ, R; RíosJARA, D; Jiménez, M; Aburto, S; Marquina, V; Marquina-Fábrega, María Luisa (1991)
    The temperature behaviour of Mossbauer spectra of a Ti50Ni47Fe3 alloy, and their corresponding parameters, are related to the structural changes associated with the premartensitic charge density wave (CDW) transitions in ...
  • Presence of Stark ladders in scattering of shear horizontal piezoelectric waves
    Monsivais, G; Otero, JA; Calas, H; Guerra, V; Stern, C; Rodríguez-Ramos, R (2004)
    The global matrix techniques are used in the analysis of the Stark-Ladder resonances for transverse horizontal and surface waves in piezoelectric multilayers. Stark-Ladder resonances are observed when these waves propagate ...
  • PROCEEDINGS OF THE 3RD WORKSHOP ON PARTICLES AND FIELDS - MORELIA, MICH - 11-15 NOVEMBER 1991 - FOREWORD
    ROA, JAE; Jiménez, JL; Villavicencio Torres, Mirna (1993)
  • Properties of the two-dimensional electron gas
    Orozco, S; Mendez-Moreno, RM; Moreno, M (1999)
    Ground stare properties of the two-dimensional electron gas are studied in the deformable jellium model. The calculations are made within the self-consistent Hartree-Fock approximation. The phase transition from plane wave ...

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