oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 384 )

2018 ( 704 )

2017 ( 696 )

2016 ( 966 )

Custom range...

Search Results: 1 - 10 of 401611 matches for " Granados M "
All listed articles are free for downloading (OA Articles)
Page 1 /401611
Display every page Item
MECáNICA DE SISTEMAS MATERIALES CONTINUOS DESDE MARCOS DE REFERENCIA NO INERCIALES
Granados M,Andrés;
Boletín Técnico , 2002,
Abstract: abstract in this paper it has been developed a simplified mathematical model for the study of the mechanics of continuous deformable material systems (those dynamical continuous systems with an invariant mass), kinematically described from a non-inertial frame of reference. in the first part, basic definitions and some fundamental kinematical and dynamical concepts are stated, for their subsequent use in the second and in the third parts. within these, the coordinate transformation and the relations of some dynamical integral quantities are of special attention. in the second part, it has been established the conservative equations of mass, linear momentum and angular momentum applied to general continuous deformable material systems flowing through a generalized translating control volume, which may rotate and deform in an arbitrary way. in order to obtain these conservative equations, the reynolds transport theorems are applied. these same equations will be obtained in a substantially more simplified form, using a different analysis and adopting a condensed notation, taken from the integral point of view of the classical mechanics. in the third part the law of conservation for mechanical energy, the k?nig and steiner theorems are deduced for the general case studied in the second part. also, it is established a way to calculate the transportation of the tensor of inertia when the body (i.e. the material system) is deformable. in this part the objective is to extend to deformable bodies those results traditionally known for rigid bodies. at the end, it is found that this last dissertation (deduced from an integral dynamical analysis) is equivalent to that studied in the second pan (deduced from the reynolds transport theorems). additionally, in an attached appendice the leibniz rule is briefly deduced, and the reynolds transport theorems are presented in a summarized way
MECáNICA DE SISTEMAS MATERIALES CONTINUOS DESDE MARCOS DE REFERENCIA NO INERCIALES MECHANICS OF CONTINUOUS MATERIAL SYTEMS FROM NON-INERTIAL FRAMES OF REFERENCE
Andrés Granados M
Boletín Técnico , 2002,
Abstract: RESUMEN En este trabajo se ha desarrollado un modelo matemático simplificado para el estudio de la mecánica de sistemas materiales continuos y deformables (aquellos sistemas dinámicos continuos con su masa invariante), cinemáticamente descrito desde un sistema de referencia no inercial. En la primera parte se enuncian las definiciones básicas y algunos conceptos cinemáticos y dinámicos fundamentales, para su subsecuente uso en la segunda y tercera parte. Dentro de estos, son de especial atención la transformación de coordenadas y las relaciones de algunas cantidades dinámicas integrales. En la segunda parte, se ha establecido las ecuaciones conservativas para la masa, la cantidad de movimiento lineal y angular aplicadas de forma general a sistemas materiales continuos y deformables fluyendo a través de un volumen de control generalizado trasladándose, el cual puede rotar y deformarse arbitrariamente. Con la finalidad de obtener estas ecuaciones conservativas, se aplican los Teoremas del Transporte de Reynolds. Estas mismas ecuaciones se obtienen aquí en una forma substancialmente más simplificada, empleando un análisis diferente y adoptando una notación condensada, la cual ha sido tomada desde el punto de vista integral de la mecánica clásica. En la tercera parte, se deducen la ley de la conservación de la energía mecánica y los Teoremas de K nig y de Steiner para el caso general planteado en la segunda parte. También se establece una nueva forma para calcular el transporte del tensor de inercia cuando el cuerpo (es decir, el sistema material) es deformable. En esta parte, el objetivo es extender a cuerpos deformables aquellos resultados tradicionalmente conocidos para cuerpos rígidos. En la parte final se encuentra que esta disertación (deducida de un análisis dinámico integral) es equivalente a aquel estudio en la segunda parte (deducida de aplicar los Teoremas de Transporte de Reynolds). Adicionalmente, en un apéndice anexo se deduce brevemente la Regla de Leibniz y se presentan de forma resumida los Teoremas de Transporte de Reynolds ABSTRACT In this paper it has been developed a simplified mathematical model for the study of the mechanics of continuous deformable material systems (those dynamical continuous systems with an invariant mass), kinematically described from a non-inertial frame of reference. In the first part, basic definitions and some fundamental kinematical and dynamical concepts are stated, for their subsequent use in the second and in the third parts. Within these, the coordinate transformation and the relations of some dynamical int
Hard Break-Up of Two-Nucleons from the 3He Nucleus
Sargsian, Misak M;Granados, Carlos
High Energy Physics - Phenomenology , 2008, DOI: 10.1103/PhysRevC.80.014612
Abstract: We investigate a large angle photodisintegration of two nucleons from the $^3$He nucleus within the framework of the hard rescattering model (HRM). In the HRM a quark of one nucleon knocked out by an incoming photon rescatters with a quark of the other nucleon leading to the production of two nucleons with large relative momentum. Assuming the dominance of the quark-interchange mechanism in a hard NN scattering, the HRM allows to express the amplitude of a two-nucleon break-up reaction through the convolution of photon-quark scattering, $NN$ hard scattering amplitude and nuclear spectral function. The photon-quark scattering amplitude can be explicitly calculated in the high energy regime, whereas for $NN$ scattering one uses the fit of the available experimental data. The HRM predicts several specific features for the hard breakup reaction. First, the cross section will approximately scale as $s^{-11}$. Secondly, the $s^{11}$ weighted cross section will have the shape of energy dependence similar to that of $s^{10}$ weighted $NN$ elastic scattering cross section. Also one predicts an enhancement of the $pp$ breakup relative to the $pn$ breakup cross section as compared to the results from low energy kinematics. Another result is the prediction of different spectator momentum dependencies of $pp$ and $pn$ breakup cross sections. This is due to the fact that same-helicity $pp$-component is strongly suppressed in the ground state wave function of $^3$He. Because of this suppression the HRM predicts significantly different asymmetries for the cross section of polarization transfer $NN$ breakup reactions for circularly polarized photons. For the $pp$ breakup this asymmetry is predicted to be zero while for the $pn$ it is close to ${2\over 3}$.
Hard Break-Up of Two-Nucleons from the 3He Nucleus
Misak M Sargsian,Carlos Granados
Physics , 2008, DOI: 10.1103/PhysRevC.80.014612
Abstract: We investigate a large angle photodisintegration of two nucleons from the $^3$He nucleus within the framework of the hard rescattering model (HRM). In the HRM a quark of one nucleon knocked out by an incoming photon rescatters with a quark of the other nucleon leading to the production of two nucleons with large relative momentum. Assuming the dominance of the quark-interchange mechanism in a hard NN scattering, the HRM allows to express the amplitude of a two-nucleon break-up reaction through the convolution of photon-quark scattering, $NN$ hard scattering amplitude and nuclear spectral function. The photon-quark scattering amplitude can be explicitly calculated in the high energy regime, whereas for $NN$ scattering one uses the fit of the available experimental data. The HRM predicts several specific features for the hard breakup reaction. First, the cross section will approximately scale as $s^{-11}$. Secondly, the $s^{11}$ weighted cross section will have the shape of energy dependence similar to that of $s^{10}$ weighted $NN$ elastic scattering cross section. Also one predicts an enhancement of the $pp$ breakup relative to the $pn$ breakup cross section as compared to the results from low energy kinematics. Another result is the prediction of different spectator momentum dependencies of $pp$ and $pn$ breakup cross sections. This is due to the fact that same-helicity $pp$-component is strongly suppressed in the ground state wave function of $^3$He. Because of this suppression the HRM predicts significantly different asymmetries for the cross section of polarization transfer $NN$ breakup reactions for circularly polarized photons. For the $pp$ breakup this asymmetry is predicted to be zero while for the $pn$ it is close to ${2\over 3}$.
Exciton Dynamics in Stacked InGaAs/GaAs Quantum Rings Under Resonant Excitation  [PDF]
R. Naouari, W. Ouerghui, J. Martinez-Pastor, M. A. Maaref, D. Granados, J. M. Garcia
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.27083
Abstract: We report systematic temperature-dependent measurements of photoluminescence spectra in self-assembled InGaAs/GaAs quantum rings (QRs) under resonant excitation condition. We have studied the rise in temperature of the ground-state intensity. The carrier transfer between the ground state of the small ring family towards the big-ring family of the bimodal size distribution is identified by analyzing the photoluminescence spectra. This effect is observed in very thin spacer and under resonant excitation. This situation makes important the lateral tunneling of excitons between rings under low temperatures (10 K). Tunneling time about 1ns was estimated at low temperature and compared to similar carrier transfer in quantum dots (QDs) found in the literature.
Proceso de producción y certificación de semilla de papa (Solanum tuberosum var. loman), por el Programa Acceso al Crédito y Apoyo a la Comercialización de la Producción Agrícola en Quiché -CREDyCOM- en el municipio de Chichicastenango, Guatemala
Maucelio Mérida,Otoniel Granados,Alessandro Scappini
Journal of Agriculture and Environment for International Development , 2012,
Abstract: El artículo “Proceso de Producción y Certificación de Semilla de Papa Variedad Loman”, es una de las publicaciones técnicas preparadas por el Programa Acceso al Crédito y Apoyo a la Comercialización de la Producción Agrícola en Quiché, CREDyCOM, con el objetivo de proporcionar una guía práctica de capacitación y producción, a fin de que los productores atendidos por el Programa puedan abastecer la demanda del mercado de semilla de calidad y apoyar el desarrollo de peque as empresas agropecuarias rurales, mejorar la calidad de vida de los agricultores y hacer sostenible el cultivo de papa comercial para su consumo en fresco, a través de la consolidación de las organizaciones de productores, la asistencia técnica y la promoción de la diversificación productiva, lo cual permita contribuir a mejorar económica y socialmente el nivel de vida de sus asociados. Este proceso de producción de semilla de papa se ha realizado en tres organizaciones y en tres comunidades potenciales en el municipio de Chichicastenango. El Programa cuenta con la financiación del gobierno de Italia a través de la Dirección General para la Cooperación al Desarrollo, del Ministerio de Relaciones Exteriores; el Instituto Agronomico per l’Oltremare de Florencia (IAO), es la institución principal responsable de la ejecución y la coordinación de las actividades que se realizan.
Cuestiones fundamentales de la física contemporánea
Máximo A. Agüero Granados
Ciencia Ergo Sum , 2006,
Abstract:
Antigravitación: una posibilidad remota?
Máximo Agüero Granados,Guadalupe Frias
Ciencia Ergo Sum , 1999,
Abstract:
Analogía mecánica de la autointeracción no-lineal de campos
Mauricio Paulin,Máximo Agüero Granados
Ciencia Ergo Sum , 2000,
Abstract: Se estudian las soluciones tipo partículas de dos modelos importantes de la teoría clásica de campos: j4 y j6. Se investigan las soluciones ligadas a condiciones de frontera trivial y de tipo condensado, es decir, en las que el campo en el infinito es constante y no se anula.
El legado fascinante del cosmos: las estrellas
Santiago Bravo,Máximo Agüero Granados
Ciencia Ergo Sum , 2001,
Abstract:
Page 1 /401611
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.