Now showing items 1-20 of 58

    • Estudio de casos del Conocimiento Didáctico del Contenido sobre la Ley de Ohm en profesores de Física de Secundaria en ejercicio 

      López Gamboa, Marco Vinicio (2021-08-18)
      Este estudio de casos se sitúa en la línea de investigación sobre el conocimiento profesional del profesorado de Ciencias Naturales. El propósito se centrará en el análisis del Conocimiento Didáctico del Contenido sobre ...
    • Leaking elastic capacitor as model for active matter 

      Alicki, Robert; Gelbwaser Klimovsky, David; Jenkins Villalobos, Alejandro (2021-05-24)
      We introduce the “leaking elastic capacitor” (LEC) model, a nonconservative dynamical system that combines simple electrical and mechanical degrees of freedom. We show that an LEC connected to an external voltage source ...
    • Dynamical theory for the battery's electromotive force 

      Alicki, Robert; Gelbwaser Klimovsky, David; Jenkins Villalobos, Alejandro; von Hauff, Elizabeth (2021-03-23)
      We propose a dynamical theory of how the chemical energy stored in a battery generates the electromotive force (emf). In this picture, the battery's half-cell acts as an engine, cyclically extracting work from its underlying ...
    • Datación por 210Pb y 137Cs en suelos sedimentarios 

      Castillo Fallas, José Carlos (2021)
      El uso de técnicas analíticas nucleares para datación tiene una gran cantidad de aplicaciones en diferentes ramas del conocimiento. La información extraída por el análisis permite asignar a un perfil de muestras el fechado ...
    • Verificación del Comisionamiento del Acelerador Lineal UNIQUE de Varian 

      Calvo Alfaro, Jorge Arturo (2021)
      Esta tesis trata sobre la Verificación del Comisionamiento del Acelerador Lineal UNIQUE, el cual se encuentra en el Hospital México. La metodología usada para este fin comprende el Protocolo Internacional para la Determinación ...
    • Estudio multi-longitudinal comparativo de las oscilaciones de manchas y filamentos solares y su implicación en la evolución de filamentos 

      Rojas Quesada, Miguel Ángel (2020-12-03)
      Se considera que las oscilaciones de períodos largos en los filamentos/prominencias observadas en EUV podrían conducir al filamento a un estado inestable, sin embargo, sus características (rango de frecuencia, amplitud, ...
    • Quantum Theory of Triboelectricity 

      Alicki, Robert; Jenkins Villalobos, Alejandro (2020-10-30)
      We propose a microphysical theory of the triboelectric effect by which mechanical rubbing separates charges across the interface between two materials. Surface electrons are treated as an open system coupled to two baths, ...
    • Optical component 

      Padilla Víquez, Gerardo José (2010-02-15)
      El invento trata de un componente óptico, que comprende un primer reflector esférico y un segundo reflector esférico, el cual está colocado para reflejar un rayo de luz varias veces entre el primer reflector y el segundo ...
    • Aparato y método para evaluar microfiltración en materiales 

      Conejo Rodríguez, Elian; Chavarría Bolaños, Daniel; Pozos Guillén, Amaury (2017-03-01)
      La presente invención se relaciona al campo de la investigación o análisis de materiales por medio de la determinación de sus características físicas o químicas, más específicamente con la determinación de la permeabilidad ...
    • Diseño y simulación de un maniquí para la cuantificación del desempeño de sondas intraoperatorias gamma 

      González López, Dagoberto Eloy (2020-05-28)
      La técnica de cirugía radioguiada se basa en la utilización de una sonda detectora de radiaciones para la localización y posterior extracción a través de procedimientos quirúrgicos del tejido enfermo, el cual acumula ...
    • Fundamentals of silicene 

      Willatzen, Morten; Lew Yan Voon, Lok Chong; Guzmán Verri, Gian Giacomo (2017-08-02)
      Silicene is a single atomic layer of silicon (Si) much like graphene, the first example of an elemental twodimensional (2D) nanomaterial whose study led to the 2010 Nobel Prize in Physics. Until 2010 or so, the only known ...
    • Cooperative elastic fluctuations provide tuning of the metal-insulator transition 

      Guzmán Verri, Gian Giacomo (2019)
      Metal-to-insulator transitions driven by strong electronic correlations occur frequently in condensed matter systems, and are associated with remarkable collective phenomena in solids, including superconductivity and ...
    • Relation between Luminescence and Electronic Surface Characteristics in p-type Porous Silicon 

      Weisz, S. Z.; Ramírez Porras, Arturo; Gómez, Manuel; Many, A.; Goldstein, Yehuda; Savir, Esther (1997)
      Measurements of photoluminescence, electronic surface states and effective surface area, at various stages of the anodization process, are presented. The results show a behavior different from that observed on n-type porous Si.
    • Phototransport Properties of a-SiC:H Alloys 

      Balberg, I.; Nery, Guillermo; Ramírez Porras, Arturo; Resto, O.; Weisz, S. Z.; Lubianiker, Y. (1995)
      We report a study of the mobility-lifetime products of the two charge carriers in a-SiC:H alloys. The measurements were carried out as a function of the carbon concentration and the temperature. An analysis, relying on the ...
    • Vacuum treatment to stabilize oxidation at low temperature region in porous silicon 

      Allen, Kevin; Pereira Cubillo, Juan Sebastián; Ramírez Porras, Arturo (2020)
      Oxidation in porous silicon is studied for as-etched samples and samples subjected to high vacuum at room temperature. Attenuated Total Reflectance (ATR) measurements in infrared spectroscopy for temperatures ranging from ...
    • Pressure dependence of ferroelectric quantum critical fluctuation 

      Coak, Matthew J.; Haines, Charles Robert Sebastian; Liu, Cheng; Guzmán Verri, Gian Giacomo; Saxena, Siddharth S. (2019-12-13)
      Phase transitions to a long-range-ordered state driven by a softened phonon mode are ubiquitous across condensed matter physics, but the evolution of such a mode as the system is tuned to or from the transition has never ...
    • Exact solution of an ekpyrotic fluid and a primordial magnetic field in an anisotropic cosmological space-time of Petrov D 

      Alvarado Marín, Rodrigo Eduardo (2017)
      This document obtained and analyzed an exact solution of an ekpyrotic fluid (P = 5/3 µ) and a primordial magnetic field, so that the latter does not induce currents or electric fields. It is determined that the main role, ...
    • Exact Solutions of a Chaplygin Gas in an Anisotropic Space-Time of Petrov D 

      Alvarado Marín, Rodrigo Eduardo (2017)
      This document obtains two exact solutions to the anisotropic spacetime of Petrov D by using the model of a perfect fluid. These solutions represent a scenario of a universe in which the pressure P and the energetic density ...
    • A study of a coronal hole associated with a large filament eruption 

      Gutiérrez Garro, Heidy; Taliashvili Enacolopas, Lela; Lazarian, Alexandre; Mouradian, Zadig (2017)
      We report the results of a detailed study of an equatorial coronal hole and a dimming region related to the eruptions of a nearby large filament and subsequent coronal mass ejections (CMEs). The dynamic eruptions of the ...
    • Do Magnetic Fields Destroy Black Hole Accretion Disk g-Modes? 

      Ortega Rodríguez, Manuel; Solís Sánchez, Hugo; Arguedas Leiva, José Agustín; Wagoner, Robert V.; Levine, Adam (2015-08-04)
      Diskoseismology, the theoretical study of normal-mode oscillations in geometrically thin, optically thick accretion disks, is a strong candidate for explaining some quasi-periodic oscillations in the power spectra of many ...