1,625 research outputs found
Nilpotent classical mechanics: s-geometry
We introduce specific type of hyperbolic spaces. It is not a general linear
covariant object, but of use in constructing nilpotent systems. In the present
work necessary definitions and relevant properties of configuration and phase
spaces are indicated. As a working example we use a D=2 isotropic harmonic
oscillator.Comment: 8 pages, presented at QGIS, June 2006, Pragu
Delta rho pi interaction leading to N* and Delta* resonances
We have performed a calculation for the three body system
by using the fixed center approximation to Faddeev equations, taking the
interaction between and , and, and and
from the chiral unitary approach. We find several peaks in the modulus
squared of the three-body scattering amplitude, indicating the existence of
resonances, which can be associated to known and and baryon states.Comment: Presented at the 21st European Conference on Few-Body Problems in
Physics, Salamanca, Spain, 30 August - 3 September 201
Radiative corrections to all charge assignments of heavy quark baryon semileptonic decays
In semileptonic decays of spin-1/2 baryons containing heavy quarks up to six
charge assignments for the baryons and lepton are possible. We show that the
radiative corrections to four of these possibilities can be directly obtained
from the final results of the two possibilities previously studied. There is no
need to recalculate integrals over virtual or real photon momentum or any
traces.Comment: 15 pages, 2 figures, RevTex. Extended discussion. Final version to
appear in Physical Review
Estilos de enseñanza y las nuevas tecnologías en la educación
El objetivo de este estudio es conocer la posible relación entre los estilos de enseñanza del profesor y la adaptación a la aplicación de las nuevas tecnologías en el aula. Los estilos de enseñanza son los comportamientos que el docente exhibe en su actividad profesional, éstos estarían basados en su conocimiento y experiencia pudiendo depender del contexto. La evolución dentro del sistema educativo español, ha dado lugar a diferentes estilos de enseñanza en el profesorado entre los que se encuentran el estilo autocrático, democrático, dominador o integrador, entre otros. Se considera la existencia de un continuo en los estilos de enseñanza donde los liberales o restrictivos, estarían situados en los extremos y los combinados en el centro del mismo. Con respecto a las nuevas tecnologías actualmente utilizadas en la enseñanza, hay que hacer referencia a las técnicas usadas en el tratamiento y transmisión de información, principalmente de informática y telecomunicaciones.Proyecto de Innovación Docente ReiDoCrea. Departamento de Psicología Social. Universidad de Granada
Magnetic phenomena in 5d transition metal nanowires
We have carried out fully relativistic full-potential, spin-polarized,
all-electron density-functional calculations for straight, monatomic nanowires
of the 5d transition and noble metals Os, Ir, Pt and Au. We find that, of these
metal nanowires, Os and Pt have mean-field magnetic moments for values of the
bond length at equilibrium. In the case of Au and Ir, the wires need to be
slightly stretched in order to spin polarize. An analysis of the band
structures of the wires indicate that the superparamagnetic state that our
calculations suggest will affect the conductance through the wires -- though
not by a large amount -- at least in the absence of magnetic domain walls. It
should thus lead to a characteristic temperature- and field dependent
conductance, and may also cause a significant spin polarization of the
transmitted current.Comment: 7 pages, 5 figure
Study of the , , and in the radiative decays
In this paper we present an approach to study the radiative decay modes of
the into a photon and one of the tensor mesons ,
, as well as the scalar ones and .
Especially we compare predictions that emerge from a scheme where the states
appear dynamically in the solution of vector meson--vector meson scattering
amplitudes to those from a (admittedly naive) quark model. We provide evidence
that it might be possible to distinguish amongst the two scenarios, once
improved data are available.Comment: The large Nc argument improved; version published in EPJA
New molecular approaches in adipogenesis regulation: The connexin 43 role
Indexación: Scopus; Redalyc.La prevalencia de la obesidad a nivel mundial se ha incrementado
rápidamente durante los últimos años debido principalmente
a los cambios en el estilo de vida de la población
con un aumento significativo en el consumo de energía y disminución
de los niveles de actividad física. Es por esto que
la comunidad científica está interesada en comprender de
forma más profunda los mecanismos que regulan la fisiopatología
de la obesidad. Dentro de los diferentes blancos de
estudio se encuentra la adipogénesis, cuyo entendimiento es
fundamental para comprender el desarrollo de la obesidad y
las patologías asociadas a esta. Recientemente ha surgido
importantes evidencias que involucran a la proteína de canales
de “Gap Junction” conexina 43 (Cx43) en la regulación
de los procesos relacionados con adipogénesis, cuyo papel
es básicamente anti-adipogénico, sin embargo, nuevas funciones
de Cx43 en la regulación de la formación del tejido
adiposo siguen descubriéndose.The global prevalence of obesity has been increased rapidly
over the past few years mainly due to changes in the lifestyle
of the population with a significant increase in energy
consumption and decreased levels of physical activity. As a
result, the scientific community is interested in a deeper understanding
of the mechanisms that regulate the pathophysiology
of obesity. In this context, adipogenesis process is an
important target of study to understand the obesity and associated
pathologies. Recently has been emerged important
evidence that involve gap junction channel protein connexin
43 (Cx43) in the regulation of processes related to adipogenesis,
whose role is fundamentally anti-adipogenic. However,
new functions of Cx43 in the regulation of adipose tissue
function also continued to emerge.http://www.redalyc.org/articulo.oa?id=5594990800
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