Scientific Consultants

Madrid, Spain

Scientific Consultants

Madrid, Spain
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Grado-Caffaro M.A.,Scientific Consultants | Grado-Caffaro M.,Scientific Consultants
Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences | Year: 2017

In order to exemplify, we consider a finite itinerant-electron metamagnetic gas at sufficiently low absolute temperature so that relevant new results are obtained. In fact, we study key aspects related to derive the electronic energy of the abovementioned metamagnetic gas in relation to the Fermi levels of the spin-up and spin-down electron bands and in relation to the exchange energy and magnetic susceptibility. Within an unprecedented mathematical-physics approach, the abovementioned electronic energy is reinterpreted by defining it as an averaged quantity from the corresponding nonrelativistic, time-independent, Schrödinger equation with two-band energy-eigenvalue spectrum. In parallel, a matrix formulation is presented. © 2017 Walter de Gruyter GmbH, Berlin/Boston.


Grado-Caffaro M.A.,Scientific Consultants | Grado-Caffaro M.,Scientific Consultants
Nonlinear Optics Quantum Optics | Year: 2017

By assuming realistically that the photon is an ultrarelativistic particle of non-zero rest-mass, we determine this mass as a function of wavelength at the geometric-optics limit. In fact, we find that the photon rest-mass at the above limit is almost proportional to wavelength. In addition, we calculate the photon kinetic energy and momentum as functions of wavelength at the geometric-optics limit. ©2017 Old City Publishing, Inc.


Grado-Caffaro M.A.,Scientific Consultants | Grado-Caffaro M.,Scientific Consultants
Modern Physics Letters B | Year: 2016

With the aim of providing an analytical approach (not accurate numerical results), for the first time, the sensitivity to the partial pressure of oxygen of the shift in the energy band gap experienced by cadmium-oxide thin films is evaluated for the visible region by introducing a suitable parameter. The sensitivity to the above pressure of the spatial carrier density is determined and compared with the sensitivity relative to the band gap shift. The gradient of the CdO carrier concentration as a function of the partial pressure of oxygen appears in the expressions for the two above sensitivity functions but the goal of this paper is not computing numerically this gradient so only qualitative estimations are done. In relation to the above results, the kinetics relative to the formation of CdO thin films are investigated. In addition, the sensitivity to the pressure in question of the corresponding optical-Absorption shift in the visible range is calculated. © 2016 World Scientific Publishing Company.


Grado-Caffaro M.A.,Scientific Consultants | Grado-Caffaro M.,Scientific Consultants
Applied Physics B: Lasers and Optics | Year: 2010

A parameter for evaluating the sensitivity of quantum vibrational energy to anharmonicity in a diatomic gasdynamic laser is defined and calculated by considering the corresponding diatomic molecules as quantum anharmonic oscillators under an interatomic Morse potential. The variation of the above parameter in terms of the vibrational states and in terms of an involved anharmonic coefficient is discussed. In particular, the parameter in question at the classical limit is examined. Both weak and strong anharmonicities are discussed. © Springer-Verlag 2010.


Grado-Caffaro M.A.,Scientific Consultants | Grado-Caffaro M.,Scientific Consultants
Optik | Year: 2013

The optical potential for photons interacting with matter is expressed mathematically by using the involved relativistic wave-number. In fact, the above expression is derived from equating the optical-potential energy to the kinetic energy of a single photon. Since the photon rest-mass is included in the above mathematical expression, that this mass is actually non-zero and wavelength-dependent is considered. © 2012 Elsevier GmbH.


Grado-Caffaro M.A.,Scientific Consultants | Grado-Caffaro M.,Scientific Consultants
Acta Physica Polonica A | Year: 2015

We investigate several issues related to the electronic states in the ligand orbital of a given transition-metal salt as, for example, a K2CuCl42H2O-type compound. In fact, to get our calculation, we start from an expression for the electronic density of states in a compound of the above type. In addition, various aspects related to superexchange interaction in both the paramagnetic and ferromagnetic cases are discussed and the electronic conduction process in the ligand orbital is studied.


Grado-Caffaro M.A.,Scientific Consultants | Grado-Caffaro M.,Scientific Consultants
Advanced Studies in Theoretical Physics | Year: 2012

We present a theoretical-analytical formulation on rapidity of secondary charged particles produced in a given inelastic hadron-nucleus collision at 22.6-400 GeV, starting from considering the maximum rapidity gap relative to charged multiplicity in rapidity space. In fact, the set of rapidity values of the charged particles is characterized as a seminormed set when the charged multiplicity is regarded as sufficiently large. Several relevant parameters and a key continuous linear operator are introduced and calculations involving them are performed.


Grado-Caffaro M.A.,Scientific Consultants | Grado-Caffaro M.,Scientific Consultants
Modern Physics Letters B | Year: 2012

The optical potential of an attractive nonrelativistic electron gas interacting with nuclear matter is determined on the basis of the concept of degenerate Fermi gas. In fact, the involved electrons are treated as three-dimensional quantum harmonic oscillators confined at the surface of a spherical (approximately ideal) potential well. Within this picture, the Fermi velocity is calculated as well as the spatial electron density at the surface of the potential well and the attractive force between the electron gas and the nuclear matter. In addition, considerations related to the LippmannSchwinger model are made. © 2012 World Scientific Publishing Company.


Grado-Caffaro M.A.,Scientific Consultants | Grado-Caffaro M.,Scientific Consultants
International Journal of Modern Physics E | Year: 2012

For the first time, we present a theoretical formulation to determine the nonrelativistic repulsive optical potential relative to neutron-nucleus interaction in terms of the s-wave coherent scattering amplitude and the radius of the nucleus which is regarded as a spherical infinite potential well. Within this context, the Fermi velocity is determined in excellent agreement with the Fermi velocity obtained from considerations relative to nuclear density obeying the Saxon-Woods distribution. Assuming this distribution, the force relative to the neutron-nucleus interaction is calculated. Aspects related to the involved chemical potential are discussed. Our results are consistent with previous work. © 2012 World Scientific Publishing Company.


Grado-Caffaro M.A.,Scientific Consultants | Grado-Caffaro M.,Scientific Consultants
Reports on Mathematical Physics | Year: 2012

For the first time, we present a matrix formalism involving the Fock operator relative to a quantum spherical non-parabolic electron gas in the absence of electric and magnetic fields. In fact, a new mathematical physics formulation based on tensor-dyadic product of matrices is proposed for determining the Fock electron energy in a quantum spherical non-parabolic electron gas. In our formulation, phenomenological weight factors are introduced as a measure of electron-electron interaction and electron-confinement effects among other issues. © 2012 Polish Scientific Publishers.

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