Escuela Superior de Computo Del IPN

Mexico

Escuela Superior de Computo Del IPN

Mexico
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Barranco-Jimenez M.A.,Escuela Superior de Computo del IPN | Paez-Hern'andez R.T.,Metropolitan Autonomous University
Entropy | Year: 2011

In this work we present a local stability analysis of the thermo-economic model of an irreversible heat engine working at maximum power conditions. The thermo-economic model is based on the maximization of a benefit function which is defined by the ratio of the power output and the total cost involved in the plant's performance. Our study shows that, after a small perturbation, the system decays exponentially to the steady state determined by two different relaxation times. In particular, we show that the relaxation times are function of the temperature ratio T = T 2/T 1 (T 1 > T 2), the cost function f and the parameter R (a parameter related to the degree of internal irreversibilities). We observe that the stability of the system improves as T increases whereas for changes in f and R, the stability properties are characterized by a rapid decay along the fast eigendirection as f increases and R decreases. Finally, we discuss our results in the context of energetic properties. © 2011 by the authors.


Ahmadi M.H.,K. N. Toosi University of Technology | Dehghani S.,K. N. Toosi University of Technology | Mohammadi A.H.,Institute Of Recherche En Genie Chimique Et Petrolier Irgcp | Mohammadi A.H.,University of KwaZulu - Natal | And 2 more authors.
Energy Conversion and Management | Year: 2013

To study the optimum design factors and the optimal thermo-economical performances an optimal performance analysis of a solar driven heat engine system at maximum thermo-economical objective function conditions is done numerically. In the present investigation, thermodynamic analysis and NSGAII algorithm are employed to optimize objective function associated to the power output, thermal efficiency for a Solar driven engine system. Three decision-making procedures are applied to optimized answers from the results. The error through investigation is shown using error analysis. © 2013 Elsevier Ltd. All rights reserved.


Juarez-Leon C.,Escuela Superior de Fisica y Matematicas Del IPN | Martinez A.,Escuela Superior de Fisica y Matematicas Del IPN | Neri M.,Escuela Superior de Fisica y Matematicas Del IPN | Torres J.J.,Escuela Superior de Computo Del IPN | Flores-Mendieta R.,Autonomous University of San Luis Potosi
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2011

We calculate the model-independent radiative corrections to the Dalitz plot of Kl3± decays to the order of (α/π)(q/M1), where q is the momentum transfer and M1 is the mass of the kaon. The final results are presented, first, with the triple integration over the variables of the bremsstrahlung photon ready to be performed numerically and, second, in an analytical form. These two forms are useful to cross-check on one another and with other calculations. This paper is organized to make it accessible and reliable in the analysis of the Dalitz plot of precision experiments and is not compromised to fixing the form factors at predetermined values. It is assumed that the real photons are kinematically discriminated. Otherwise, our results have a general model-independent applicability. © 2011 American Physical Society.


Torres J.J.,Escuela Superior de Computo Del IPN | Martinez A.,Escuela Superior de Fisica y Matematicas Del IPN | Neri M.,Escuela Superior de Fisica y Matematicas Del IPN | Juarez-Leon C.,Escuela Superior de Fisica y Matematicas Del IPN | Flores-Mendieta R.,Autonomous University of San Luis Potosi
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012

We calculate the radiative corrections to the Dalitz plot of Kl3± decays to order (α/π)(q/M 1), where q is the momentum transfer and M 1 is the mass of the kaon. We restrict the analysis to the so-called four-body region, which arises when no discrimination of real photons is made either kinematically or experimentally. We present our results in two ways: the first one with the triple integration over the photon kinematical variables ready to be performed numerically and the second one in a fully analytical form. Our results can be useful in experimental analyses of the Dalitz plot, by evaluating the model-independent coefficients of the quadratic products of the form factors; we provide some numbers as a case example. We find a small, albeit non-negligible, contribution from the four-body region to the radiative correction to the total decay rate of Kl3± decays. © 2012 American Physical Society.


de la Cruz-Alejo J.,Tecnologico de Estudios Superiores de Ecatepec | Noe Oliva-Moreno L.,Escuela Superior de Computo del I.P.N.
Advanced Materials Research | Year: 2014

In this paper a low voltage FGMOS analog multiplier is proposed that uses a follower voltage flipped (FVF), which dominates its operation. In order to reduce the power supply of the multiplier, floating gate CMOS transistors (FGMOS) are used. Theoretical steps of the FVF design are presented together with its simulation. The output of the FVF is insensitive to the device parameters and is loaded with a resistive load. The multiplier design consists of two FVF cells, two current sensors FVF and one Gilbert cell multiplier. The results show that the proposed multiplied in a 0.13μm CMOS process exhibits significant benefits in terms of linearity, insensibility to device parameters, bandwidth and output impedance. The power supply is 0.8V and a power consumption of 181μW. © (2014) Trans Tech Publications, Switzerland.


Barranco-Jimenez M.A.,Escuela Superior de Computo del IPN | Sanchez-Salas N.,Escuela Superior de Fisica y Matematicas del IPN | Angulo-Brown F.,Escuela Superior de Fisica y Matematicas del IPN
Entropy | Year: 2011

In the present paper, the thermoeconomic optimization of an irreversible solar-driven heat engine model has been carried out by using finite-time/finite-size thermodynamic theory. In our study we take into account losses due to heat transfer across finite time temperature differences, heat leakage between thermal reservoirs and internal irreversibilities in terms of a parameter which comes from the Clausius inequality. In the considered heat engine model, the heat transfer from the hot reservoir to the working fluid is assumed to be Dulong-Petit type and the heat transfer to the cold reservoir is assumed of the Newtonian type. In this work, the optimum performance and two design parameters have been investigated under two objective functions: the power output per unit total cost and the ecological function per unit total cost. The effects of the technical and economical parameters on the thermoeconomic performance have been also discussed under the aforementioned two criteria of performance. © 2011 by the authors.


Pacheco-Paez J.C.,Escuela Superior de Fisica y Matematicas Del IPN | Angulo-Brown F.,Escuela Superior de Fisica y Matematicas Del IPN | Barranco-Jimenez M.A.,Escuela Superior de Computo Del IPN
Journal of Physics: Conference Series | Year: 2015

In this work, we study the thermoeconomics of a non-endoreversible simplified thermal power plant model, the so-called Novikov engine. Our study is made by means of the maximization of objective functions defined by the quotient of the characteristic functions (power output, efficient power and ecological function) and the total costs considered in the performance of the power plant. In our study three different costs are considered: a capital cost that is proportional to the investment and, therefore, to the size of the plant, a fuel cost that is proportional to the fuel consumption and a cost associated to maintenance of the power plant; that is, proportional to the power output of the plant. It is shown that under ecological conditions the plant dramatically reduces the amount of heat rejected to the environment, and a loss of profits is translated in an usage of fuels that dramatically reduces the heat rejected towards the environment in comparison to that obtained by means of maximum power regime. © Published under licence by IOP Publishing Ltd.


Chimal-Eguia J.C.,Research Center en Computacion del | Sanchez-Salas N.,Escuela Superior de Fisica y Matematicas del IPN | Barranco-Jimenez M.A.,Escuela Superior de Computo del IPN
Entropy | Year: 2012

This work shows the power of the variational approach for studying the efficiency of thermal engines in the context of the Finite Time Thermodynamics (FTT). Using anendoreversible Curzon-Ahlborn (CA) heat engine as a model for actual thermal engines,three different criteria for thermal efficiency were analyzed: maximum power output,ecological function, and maximum power density. By means of this procedure, the performance of the CA heat engine with a nonlinear heat transfer law (the Stefan-Boltzmann law) was studied to describe the heat exchanges between the working substance and its thermal reservoirs. The specific case of the Müser engine for all the criteria was analyzed.The results confirmed some previous findings using other procedures and additionally new results for the Müser engine performance were obtained. © 2012 by the authors.


Ahmadi M.H.,K. N. Toosi University of Technology | Ahmadi M.H.,Institute Of Recherche En Genie Chimique Et Petrolier Irgcp | Mohammadi A.H.,Institute Of Recherche En Genie Chimique Et Petrolier Irgcp | Mohammadi A.H.,University of KwaZulu - Natal | And 2 more authors.
Energy Conversion and Management | Year: 2013

A solar-powered high temperature differential Stirling engine has been considered for optimization with multiple criteria. A mathematical model based on the finite-time thermodynamics has been developed so that the output power and thermal efficiency and the rate of entropy generation of the solar Stirling system with finite rate of heat transfer, regenerative heat loss, conductive thermal bridging loss and finite regeneration process time are obtained. Furthermore, imperfect performance of the dish collector and convective/radiative heat transfer mechanisms at the hot end as well as the convective heat transfer at the heat sink of the engine are considered in the developed model. Three objective functions including the output power and overall thermal efficiency have been considered simultaneously for maximization and the rate of entropy generation of the Stirling engine are minimized at the same time. Multi-objective evolutionary algorithms (MOEAs) based on NSGA-II algorithm has been employed while the Effectiveness's of regenerator, the Effectiveness's of the low temperature heat exchanger, the Effectiveness's of the high temperature heat exchanger, heat capacitance rate of the heat sink, heat capacitance rate of the heat source, temperatures of the working fluid in the high temperature isothermal process and temperatures of the working fluid in the low temperature isothermal process are considered as decision variables. Pareto optimal frontier has been obtained and a final optimal solution has been selected using various decision-making approaches including the fuzzy Bellman-Zadeh, LINMAP and TOPSIS methods. © 2013 Elsevier Ltd. All rights reserved.


Aguilar-Ibanez C.,CIC IPN | Suarez-Castanon M.S.,Escuela Superior de Computo Del IPN | Rosas-Soriano L.I.,CIC IPN
International Journal of Robust and Nonlinear Control | Year: 2011

We present a simple control scheme for changing the position of a microscopic particle immersed in a viscous medium and trapped by optical tweezers. We derive a simple feedback controller under the consideration that the particle mass is so small that it can be discarded from the motion equations. This approximation is well justified in practice, since the inertial force produced by the motion of a micron-scaled trapped particle is completely dominated by the medium viscous drag force. Finally, we formally prove that the obtained controller is able to globally asymptotically stabilize the system when the particle mass is considered, if some suitable values of some control parameter are used. The stability analysis of the controlled system was carried out by using the standard Lyapunov stability theory. Also, by means of numerical simulations, we show that the obtained closed-loop system is robust when random thermal noise is presented. © 2010 John Wiley & Sons, Ltd.

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