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The Hubble Constant and the Deceleration Parameter in Anisotropic Cosmological Spaces of Petrov type D
(2016-11)
In this paper the Hubble parameter and the deceleration parameter are analyzed for a group of anisotropic homogeneous solutions of the Petrov type-D. It is obtained that for the said set of solutions can be constructed a ...
Monte Carlo dosimetry of a realistic multicellular model of follicular lymphoma in a context of radioimmunotherapy
(2020)
Purpose
Small-scale dosimetry studies generally consider an artificial environment where the tumors are spherical and the radionuclides are homogeneously biodistributed. However, tumor shapes are irregular and radiopharmaceutical ...
Observed Changes (1970-1999) in Extreme Hydroclimatic Events in Central America
(2018-04-20)
Previous studies have shown that most of Central America has been experiencing warming trends during the last 30-50 years, while precipitation annual totals have not changed much. Warming alone can exacerbate the effects ...
Revealing a new region of gamma-ray emission in the vicinity of HESS J1825–137
(2019-02-17)
HESS J1825–137 is a bright very high-energy gamma-ray source that has been firmly established as a pulsar wind nebula (PWN), and one of the most extended gamma-ray objects within this category. The progenitor supernova ...
Evaluación de la calidad de imagen del PET/CT Biograph Vision 450 al variar parámetros de reconstrucción
(2023)
Los datos obtenidos por los sistemas PET/CT pasan por un algoritmo de reconstrucción antes de poder generar las imágenes. Estos algoritmos de reconstrucción permiten variar parámetros como el número de iteraciones y filtrado ...
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 ...
Short term topological changes of coronal holes associated with prominence eruptions and subsequent CMEs
(2013-03-15)
We study the short-term topological changes of equatorial and polar coronal hole (CH) boundaries, such as a variation of their area and disintegration, associated to reconnection with nearby (within 15° distance) quiescent ...
Cálculo del corrimiento al rojo fotométrico de galaxias submilimétricas alrededor de galaxias de núcleos activos
(2022)
Las galaxias submilimétricas (SMGs) son fuentes que se detectaron por primera vez en
los años 90 y se volvieron de mucho interés para la comunidad astronómica debido
a sus altas tasas de formación estelar y sus altos ...
Modelado del espacio-tiempo en el interior de una estrella de neutrones en rotación con un cuadrupolo agregado de forma perturbativa
(2021-11-07)
The potentials and multipolar parameters for a neutron star internal space-time model are calculated in a perturbative series using the angular velocity as perturbation parameter. Twelve equations of state are considered, ...
Structure factor of a relaxor ferroelectric
(2015-04-14)
We study a minimal model for a relaxor ferroelectric including dipolar interactions, and short-range harmonic and anharmonic forces for the critical modes as in the theory of pure ferroelectrics together with quenched ...