Vol. 51 No. 1 Jan-Jun (2005): Revista Mexicana de Física E

Published: 2005-01-01

Artículos

  • Lente térmica inducida por diodo láser como experiencia didáctica de laboratorio de física

    L. Rodríguez, J. Ramirez, A. Marcano O.
    1-4
    Abstract:
    A simple and compact experiment is showed, for the observation and study of the Thermal Lens Effect induced by a laser diode of low cost and low power (4 mW). We study the temporal, space and shift of phase dependency using the Fresnel aberrant aproximation for iodine-ethanol solutions. We show the applicability of the experiment in didactic Physics laboratoies. With the proposed experimental scheme, it is possible to measure absorption's coefficient of 10$^{ - 5}$ cm$^{ - 1}$.
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  • Chirotope concept in various scenarios of physics

    J.A. Nieto
    5-12
    Abstract:
    We argue that the chirotope concept of oriented matroid theory may be found in different scenarios of physics, including classical mechanics, quantum mechanics, gauge field theory, $p$-branes formalism, two time physics and Matrix theory. Our observations may motivate the interest of possible applications of matroid theory in physics.
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  • Tres aspectos del problema de Kepler

    E. Piña Garza, J.L. del Río Correa
    13-17
    Abstract:
    This is a review paper where the Kepler's problem is studied starting from the Kepler's laws; the solution is constructed from the Hamilton's vector and the Laplace-Runge-Lenz vector methods, and is concluded when the coordinates are expressed in terms of the eccentric anomaly.
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  • El límite del oscilador cuántico a la partícula libre

    G.S. Pogosyan, L.E. Vicent, K.B. Wolf
    18-22
    Abstract:
    When we let the Hooke constant of a harmonic oscillator tend to zero, the system becomes free. We examine this limit in the context of quantum mechanics, where the quantized energy values accumulate to a continuum, and where the Hermite functions become plane waves.
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  • Sobre el principio de incertidumbre de Heisenberg entre tiempo y energía: una nota didáctica

    G.E. Giribet
    23-30
    Abstract:
    This brief note has the didactical purpose of discussing the meaning of the uncertainty principle involving energy and time in quantum mechanics within the context of the seminal works on this subject. The importance of this topic is, indeed, frecuently neglected in several textbooks on quantum mechanics. Then, these pages are addressed to students attending to an undergraduate course on quantum mechanics; and the original aim is to present a list of references of the points which take part in the principal discussions on the subject. Principal attention is devoted to the discussion of the fallacies, which are indeed persistent in the literature.
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  • On the vector solutions of Maxwell equations in spherical coordinate systems

    E.A. Matute
    31-36
    Abstract:
    The Maxwell equations for the spherical components of the electromagnetic fields outside sources do not separate into equations for each component alone. We show, however, that general solutions can be obtained by separation of variables in the case of azimuthal symmetry. Boundary conditions are easier to apply to these solutions, and their forms highlight the similarities and differences between the electric and magnetic cases in both time-independent and time-dependent situations. Instructive examples of direct calculation of electric and magnetic fields from localized charge and current distributions are presented.
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  • La física y la formación de los ingenieros mexicanos que colaboraron en el magno proyecto hidroeléctrico de Necaxa

    E.A. Martínez Miranda, M. de la Paz Ramos Lara
    37-44
    Abstract:
    The advances achieved in electricity and magnetism during the XVIII and XIX centuries, prompted a series of applications that transformed not only the productive sectors, but also the people's lives in the whole world. The generation of electric power, in particular, made possible the construction of the first hidroelectric plants in the world by the end of the XIX century. In Mexico, the project of the hidroelectric complex of Necaxa became one of the most important in Latin America during the first years of the XX century. This project comprised both foreign and Mexican engineers. The former were contracted by a Canadian company in charge of the project: The Mexican Light and Power Company, Limited, which also came to hire a small number of Mexican engineers, but assigning to them secondary technical positions. Most of the Mexican engineers worked for the Mexican government --in the Secretariat of Development, Colonization, and Industry of the Mexican Republic-, like inspector engineers in charge of evaluating projects, supervising works, guarantying security to the population, and watching the strict and entire fulfillment of all the concessions granted by the Federal Government for these kind of works. Herein, the education of the Mexican engineers that collaborated in the hydroelectric project of Necaxa will be analyzed, with the objective to assess the importance of Physics courses in their professional development and in the basis for their functions as inspector engineers.
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  • La construcción newtoniana de la gravitación universal

    J.E. Marquina
    45-53
    Abstract:
    This paper analyzes the way in which Newton introduces the concept of Universal Gravitation in Book III of the Philosophiae Naturalis Principia Mathematica, based on the mathematical results proved in the two first books and in the Phenomena and the Rules of Reasoning in Philosophy that Newton proposes at the beginning of Book III.
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