Papers by john paul morales
Peer professional development for workforce development in Arizona. A grassroots capacity-building initiative
Performance Improvement, 2006
Interagency Collaboration 9 The Pennsylvania Health and Human Services Call Center
2014 IEEE International Autumn Meeting on Power, Electronics and Computing (ROPEC), 2014
It is clear that the development of new methodologies that increase the electrical systems effici... more It is clear that the development of new methodologies that increase the electrical systems efficiency and the welfare of users, avoiding pollution as best as possible, are highly desired by researchers and utilities. In this context, in Ecuador, basic service elements like water heaters are usually used by population. Where, currently water heaters based on Liquefied Petroleum Gas (LPG) are used. However, these devices are harmful for the country's economy. In this research, a novel prototype corresponding to an induction water heater is proposed. This has three operation stages corresponding to rectification, filtering, and controlling single-phase inverter by sinusoidal pulse width modulation (SPWM). In order to validate the proposed work, different test at each operation state, were developed. Results show an acceptable performance. Therefore, the prototype can be considered as an alternative to traditional devices.
Transplantation of human embryonic stem cell derived-neural stem/progenitor cells for spinal cord injury in adult NOD/Scid mice
Momento Revista De Fisica, Jul 23, 2012
Obtenemos las relaciones de reflectancia y transmitancia en la configuración de Kretschmann en un... more Obtenemos las relaciones de reflectancia y transmitancia en la configuración de Kretschmann en un sistema con una película de espesor 500Ȧ y un laser de He-Ne con polarización p que incide en el sistema con unángulo superior alángulo critico de reflexión interna total, estos parámetros generan una oscilación colectiva del gas de electrones libres del material creando así una oscilación denominada plasmon.
Revista De La Sociedad Colombiana De Fisica, 2009
Es conocido que al tomar los quarks up y down sin masa la Cromodinámica Cuántica tiene una simetr... more Es conocido que al tomar los quarks up y down sin masa la Cromodinámica Cuántica tiene una simetría quiral exacta, pero dado que dichos quarks tienen masas pequeñas y diferentes esta simetría no es exacta, por lo tanto debe estar rota. Aquí estudiamos el Modelo σ Lineal en el límite de gran N , siendo N el número de piones, con un término que rompe la simetría quiral explícitamente, además analizamos la evolución del potencial efectivo con la temperatura y el número de campos, encontrando temperaturas criticas T c para los casos en que la simetría quiral es explícita en el Lagrangiano y para cuando está rota explícitamente. Observamos que la simetría quiral puede ser restaurada por efectos del número de campos N , dependiendo del esquema de ruptura.
Momento Revista De Fisica, Oct 23, 2012
The Generalized Method of Transfer Matrix (MMT) appears as an alternative to quantum phenomena re... more The Generalized Method of Transfer Matrix (MMT) appears as an alternative to quantum phenomena research in semiconductor materials and optoelectronic components. In this paper the MMT is applied to the propagation phenomena of a particle through a well or a potential barrier to the quantum case. The relations scattering amplitudes are deduced using the coefficients of the transfer matrix (transmission and reflection). The results are compared with related literature, to determine the accuracy and scope of the MMT, namely which can be applied to study many other problems of wave propagation and electrons, even in layered media as photonic crystals.
Acta Physica Hungarica a Heavy Ion Physics, Nov 23, 1999
We calculate the nucleonic and pionic dispersion relations at finite temperature T and non-vanish... more We calculate the nucleonic and pionic dispersion relations at finite temperature T and non-vanishing chemical potentials $(\mu_f)$ in the context of an effective chiral theory that describes the strong and electromagnetic interactions for nucleons and pions. The dispersion relations are calculated in the broken chiral symmetry phase, where the nucleons are massive and pions are taken as massless. The calculation is performed at lowest order in the energy expansion, working in the framework of the real time formalism of thermal field theory in the Feynman gauge. These one-loop dispersion relations are obtained at leading order with respect to T and $\mu_f$. We also evaluate the effective masses of the quasi-nucleon and quasi-pion excitations in thermal and chemical conditions as the ones of a neutron star.
We consider the O(N + 1)/O(N ) Non-Linear Sigma Model for large N as an effective theory for low-... more We consider the O(N + 1)/O(N ) Non-Linear Sigma Model for large N as an effective theory for low-energy QCD at finite temperature T , in the chiral limit. At T = 0 this formulation provides a good description of scattering data in the scalar channel and generates dynamically the f0(500) pole, the pole position lying within experimental determinations. Previous T = 0 results with this model are updated using newer analysis of pion scattering data. We calculate the pion scattering amplitude at finite T and show that it satisfies exactly thermal unitarity, which had been assumed but not formally proven in previous works. We discuss the main differences with the T = 0 result and we show that one can define a proper renormalization scheme with T = 0 counterterms such that the renormalized amplitude can be chosen to depend only on a few parameters. Next, we analyze the behaviour of the f0(500) pole at finite T , which is consistent with chiral symmetry restoration when the scalar susceptibility is saturated by the f0(500) state, in a second-order transition scenario and in accordance with lattice and theoretical analysis. as a derivative and mass expansion L = L p 2 + L p 4 + . . . , where p denotes generically a meson energy scale compared to the chiral scale Λ χ ∼ 1 GeV. The lowest order Lagrangian L p 2 is the Non-linear Sigma Model (NLSM). The use of energy expansions in chiral effective theories is also justified at finite temperature to describe Heavy Ion Physics. Pions are actually the most copiously produced particles after a Heavy Ion Collision and most of their properties from hadronization to thermal freeze-out can be reasonably described within the temperature range where these theories are applicable. Thus, the chiral restoring behaviour in terms of the quark condensate is qualitatively obtained within ChPT . Moreover, the introduction of realistic pion interactions by demanding unitarity through the Inverse Amplitude Method (IAM) [21] extended at finite T improves ChPT, providing a more accurate description of several effects of interest in a Heavy-Ion environment, such as thermal resonances, transport coefficients and electromagnetic corrections . This approach also provides a novel understanding of the role of the σ/f 0 (500) broad resonant state in chiral symmetry restoration, without having to deal with the typical LSM drawbacks. Thus, the unitarized ππ scattering amplitude within ChPT at finite temperature develops a I = J = 0 thermal pole at
RESUMEN We introduce a new approach to generate dinamically the masses of elemen-tary particles i... more RESUMEN We introduce a new approach to generate dinamically the masses of elemen-tary particles in the SU (3)C ×SU (2)L × U (1)Y Standard Model without Higgs Sector (SMWHS). We start from the assumption that rest masses correspond to the effective masses of particles in an elementary quantum fluid at zero tem-perature. Starting from the experimental mass values for quarks and leptons, taking the top quark mass in the range 169.2 GeV < m t < 178.6 GeV, we can compute, as an evidence of the consistency of our approach, the mass values for the W ± and Z 0 gauge bosons in agreement with the experimental results. The determination of the mechanism by which elementary particles acquire mass is an important step in the aim to understand nature at the microscopic level [1]. In this determination the Higgs mechanism is one of the most atractive approaches known in particle physics [1]. However this mechanism, which is based on the existence of a Higgs sector of scalar fields, is the mo...
A note on the gammagamma -> pi0 pi0 reaction in the 1/N expansion of chiPT
In this work we present the results of a complete calculation of the gammagamma -> pi0 pi0 amp... more In this work we present the results of a complete calculation of the gammagamma -> pi0 pi0 amplitude to leading order in the largeN approximation (N being the number of Goldstone bosons) up to orderm2pi/(F2) . The amplitude turns to be proportional to that of pi+ pi- -> pi0 pi0. In spite of the fact that this factorization property cannot hold in general (as it was recently pointed out by Morgan and Penington), it appears here since in the large N limit only the I = J = 0 channel contributes to the gammagamma -> pi0 pi0 reaction. Moreover it seems to be a reasonable approximation in this case since it is possible to reproduce, as a prediction, the experimental data starting from a one-parameter fit of the pipi scattering data.
The large N effective action of the non-linear sigma model based in the coset O(N+1)/O(N) is obta... more The large N effective action of the non-linear sigma model based in the coset O(N+1)/O(N) is obtained. The renormalization of this effective action requires the introduction of an infinite set of counterterms. However, there exit particular cases where, at some scale, only a finite number of non-zero coupling constants are present. This fact makes possible a one parameter fit of the I=J=0 low-energy pion scattering. The corresponding non-local effective action is used to study the properties of the skyrmion which is shown to be unstable in this approximation. Comment: 24 pages, FT/UCM/14/93, SU-ITP-93-32
We describe the behaviour of semiclassical electrodynamics under gauge transformations. For this ... more We describe the behaviour of semiclassical electrodynamics under gauge transformations. For this purpose we observe the structure of Schr\"odinger equation and matricial elements under these transformations. We conclude this theory is not gauge invariant. As a consequence of this fact, we obtain a possible loss of predictability of physical results.
Electronic Journal of Theoretical Physics
We present an approach of mass generation for Standard Model particles in which fermions acquire ... more We present an approach of mass generation for Standard Model particles in which fermions acquire masses from their interactions with physical vacuum and gauge bosons acquire masses from charge fluctuations of vacuum. A remarkable fact of this approach is that left-handed neutrinos are massive because they have a weak charge. We obtain consistently masses of electroweak gauge bosons in terms of fermion masses and running coupling constants of strong, electromagnetic and weak interactions. On the last part of this work we focus our interest to present some consequences of this approach as for instance we first show a restriction about the possible number of fermion families. Next we establish a prediction for top quark mass and finally fix the highest limit for the summing of the square of neutrino masses.
We introduce a new approach to generate dinamically the masses of elementary particles in the $SU... more We introduce a new approach to generate dinamically the masses of elementary particles in the $SU(3)_C \times SU(2)_L \times U(1)_Y$ Standard Model without Higgs Sector (SMWHS). We start from the assumption that rest masses correspond to the effective masses of particles in an elementary quantum fluid at zero temperature. These effective masses are obtained through radiative corrections, at one-loop order, in the context of the real time formalism of quantum field theory at finite temperature and density. The quantum fluid is described in structure and dynamics by the SMWHS and it is characterized by non-vanishing chemical potentials associated to the different fermion flavour species. Starting from the experimental mass values for quarks and leptons, taking the top quark mass as $m_t = 172.916$ GeV, we can compute, as an evidence of the consistency of our approach, the experimental central mass values for the $W^{\pm}$ and $Z^0$ gauge bosons. Subsequently we introduce in the SMWHS ...
Hamiltonian operators are gauge dependent. For overcome this difficulty we reexamined the effect ... more Hamiltonian operators are gauge dependent. For overcome this difficulty we reexamined the effect of a gauge transformation on Schr\"odinger and Dirac equations. We show that the gauge invariance of the operator $H-i\hbar\frac{\partial}{\partial t}$ provides a way to find the energy operator from first principles. In particular, when the system has stationary states the energy operator can be identified without ambiguities for non-relativistic and relativistic quantum mechanics. Finally, we examine other approaches finding that in the case in which the electromagnetic field is time independent, the energy operator obtained here is the same as one recently proposed by Chen et al. [1].
Constraints on neutrino masses coming from magnetic dipole moments in a two Higgs doublet model type I and II
In the framework of a two Higgs doublet model type I and type II, we calculate limits on neutrino... more In the framework of a two Higgs doublet model type I and type II, we calculate limits on neutrino masses for the different types of neutrinos, by using the experimental bounds on their magnetic dipole moments. This is carried out by analyzing diagrams of Cherenkov neutrino decays with a charged Higgs into the loop, coming from the two Higgs doublet model (2HDM). Such constraints are translated into allowed regions in the free parameters of the models, for each neutrino flavor. The analysis was performed by sweeping the charged Higgs mass between (100-900)GeV and taking into account the experimental constraints for $\tan\beta $ in the 2HDM type I and II, obtaining contributions close to the experimental thresholds for muon and tau neutrinos, while for electron neutrino the relevant contribution comes from standard model and keeps out of the reach of forthcoming experiments.
Unitariedad en El Limite De Gran N
In this work we establish that unitarity holds for the calculation of the decay amplitude for a h... more In this work we establish that unitarity holds for the calculation of the decay amplitude for a heavy Higgs going to two charged pions in the large N limit at dominant order.
It is consider a conventional gauge theory SU(2)×U(1) with two doublet Higgs, which is the simple... more It is consider a conventional gauge theory SU(2)×U(1) with two doublet Higgs, which is the simplest extension of the Standar Model. We analyzedthe case when all scalar physics particle are heavy, e g, are biggest with respect to the electroweak breaking scale, v = 246 GeV . Is construct a Effective Lagrangian for the two doublet Higgs model that describe the physcis at low energy Se considera una teoría gauge convencional SU(2) × U(1) con dos dobletes de Higgs, la cual es la extensión más simple de la teoría estandar y analizamos el caso en que todas las partículas escalares físicas son muy pesadas, es decir con masas mucho mayores que la escala de rompimiento electrodebil, v = 246 GeV . De esta manera se construye un Lagrangiano Efectivo para describir la física de bajas energías a trav¿es del Modelo de dos dobletes de Higgs.
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Papers by john paul morales