Browsing Física by Title
Now showing items 6-25 of 54
-
Chandler wobble: Stochastic and deterministic dynamics
(2016-09-18)We propose a model of the Earth’s torqueless precession, the “Chandler wobble,” as a self-oscillation driven by positive feedback between the wobble and the centrifugal deformation of the portion of the Earth’s mass contained ... -
Cooperative elastic fluctuations provide tuning of the metal-insulator transition
(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 ... -
Cosmological Exact Solutions Set of a Perfect Fluid in an Anisotropic Space-Time in Petrov Type D
(2016-06)In this document a set of exact solutions is obtained by using the model of a perfect fluid on an homogeneous and anisotropic space-time that belongs to (Local Rotational Symmetry) Petrov’s type D. This solutions represent ... -
Design and Characterization of a High Vacuum Metals Deposition System based on Electron Beam Evaporation
(2010-08-03)We describe a high vacuum metals deposition system based ona variation of a pendant-drop type electron beam evaporator.This system uses a Molybdenum crucible as an evaporantinstead of a rod or wire usually used in ultrathin ... -
Diseño y caracterización de un enfriador de átomos de tipo “desacelerador Zeeman”
(2016)Nosotros presentamos un método que utiliza simultáneamente dos modelos matemáticos, con el objetivo de optimizar el diseño de un desacelerador Zeeman, con miras a la implementación de átomos ultrafríos a la física del ... -
Diseño y simulación de un maniquí para la cuantificación del desempeño de sondas intraoperatorias gamma
(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 ... -
Distribución espacial de impactos de eventos hidrometeorológicos en América Central
(2016)América Central está expuesta a la ocurrencia de eventos hidrometeorológicos a lo largo del año y los impactos que estos pueden provocar van a estar mayormente localizados en áreas donde las variables tanto naturales como ... -
Do Magnetic Fields Destroy Black Hole Accretion Disk g-Modes?
(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 ... -
El inflatón complejo
(1999) -
Electronic structure of silicon-based nanostructures
(2007-08-30)We have developed a unifying tight-binding Hamiltonian that can account for the electronic properties of recently proposed Si-based nanostructures, namely, Si graphene-like sheets and Si nanotubes. We considered the sp3s∗ ... -
Estimation of Silicon Nanocrystalline Sizes from Photoluminescence Measurements of RF Co-Sputtered Si/SiO2 Films
(Materials Research Society Symposium Proceedings 737 (2003), 2003)A stochastic distribution of nanocrystalline sizes model is applied to fit photoluminescence (PL) spectra of luminescent Si nanocrystals in a Si/SiO2 matrix synthesized by RF co-sputtering on the top of quartz substrates. ... -
Estudio multi-longitudinal comparativo de las oscilaciones de manchas y filamentos solares y su implicación en la evolución de filamentos
(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, ... -
Exact solution of an ekpyrotic fluid and a primordial magnetic field in an anisotropic cosmological space-time of Petrov D
(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
(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 ... -
Fundamentals of silicene
(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 ... -
(Hydro)climatological studies of climate change and variability in Central America
(2018-06-26)This is the presentation of Hugo Hidalgo at the CORDEX Central America and South America Training Workshop on Downscaling Techniques, in La Paz, Bolivia, June 25 to 27, 2018. -
Interaction of a quantum field with a rotating heat bath
(2018-08-01)The linear coupling of a rotating heat bath to a quantum field is studied in the framework of the Markovian master equation for the field's non-unitary time evolution. The bath's rotation induces population inversion for ... -
Irreversibility in an ideal fluid
(2014-10)When a real fluid is expelled quickly from a tube, it forms a jet separated from the surrounding fluid by a thin, turbulent layer. On the other hand, when the same fluid is sucked into the tube, it comes in from all ... -
Irreversibility of mechanical and hydrodynamic instabilities
(2017-12-01)The literature on dynamical systems has, for the most part, considered self-oscillators (i.e., systems capable of generating and maintaining a periodic motion at the expense of an external energy source with no corresponding ...