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Ramirez J.M.,CINVESTAV | Gonzalez J.M.,Technological University of Mexico | Ruben T.O.,Tulancingo Polytechnic University
International Journal of Electrical Power and Energy Systems | Year: 2011

With the advent of new technology based on power electronics, power systems may attain better voltage profile. This implies the proposition of careful strategies to dispatch reactive power in order to take advantage of all reactive sources, depending on size, location, and availability. This paper proposes an optimal reactive power dispatch strategy taking care of the steady state voltage stability implications. Two power systems of the open publications are studied. Power flow analysis has been carried out, which are the initial conditions for Transient Stability (TS), Small Disturbance (SD), and Continuation Power Flow (CPF) studies. Steady state voltage stability analysis is used to verify the impact of the optimization strategy. To demonstrate the proposal, PV curves, eigenvalue analyses, and time domain simulations, are utilized. © 2010 Elsevier Inc. All rights reserved.


Cruzado B.M.,Autonomous University of San Luis Potosi | Atencio J.A.D.,Tulancingo Polytechnic University | Vazquez y Montiel S.,Tulancingo Polytechnic University | Gomez E.S.,Autonomous University of San Luis Potosi
Biomedical Optics Express | Year: 2015

In this work we describe the development of a program that simulates the propagation of photons through refractive and reflecting optical components such as lenses, mirrors and stops that includes a biological tissue sample as the main issue to be investigated in order to get a simulated value of light distribution, in particular, of the unscattered light. The analysis of the photons that travel through the sample is based on the program Monte Carlo Multi-Layered with some modifications that consider a Gaussian beam as initial source of light. Position, directional cosines and weight of photons exiting the turbid media are used to propagate them through an optical system. As a mean of validation of the program, we selected a typical optical system for measurement of collimated transmittance. Therefore, several tests were carried out to find the optical system that gives the theoretical collimated transmittance at different values of the optical properties of the turbid media. Along this validation, the optimal experimental configuration is found. Using this results, a comparison between the simulated optimal configuration and the experimental set-up was done, by using a colloidal suspension as a turbid media. © 2015 Optical Society of America.


Rivas-Cambero I.,Tulancingo Polytechnic University | Sausedo-Solorio J.M.,Autonomous University of the State of Hidalgo
Meccanica | Year: 2012

We propose a general model for pendular systems with an arbitrary number of links arranged sequentially. The form of this model is easily adaptable to different settings and operating conditions. The main subject of analysis is a system obtained as a specific case taken from the general analysis, a three-links pendulum with damping subject to periodic perturbation. We performed a theoretical analysis of the frequency response and compared it with results from temporal integration. Moreover, a law was obtained explaining the behavior of the shift of the resonant frequencies due to a change in a parameter. © Springer Science+Business Media B.V. 2011.


Castillo-Villar K.K.,University of Texas at San Antonio | Minor-Popocatl H.,Tulancingo Polytechnic University | Webb E.,Oak Ridge National Laboratory
Energies | Year: 2016

Logging residues, which refer to the unused portions of trees cut during logging, are important sources of biomass for the emerging biofuel industry and are critical feedstocks for the first-type biofuel facilities (e.g., corn-ethanol facilities). Logging residues are under-utilized sources of biomass for energetic purposes. To support the scaling-up of the bioenergy industry, it is essential to design cost-effective biofuel supply chains that not only minimize costs, but also consider the biomass quality characteristics. The biomass quality is heavily dependent upon the moisture and the ash contents. Ignoring the biomass quality characteristics and its intrinsic costs may yield substantial economic losses that will only be discovered after operations at a biorefinery have begun. This paper proposes a novel bioenergy supply chain network design model that minimizes operational costs and includes the biomass quality-related costs. The proposed model is unique in the sense that it supports decisions where quality is not unrealistically assumed to be perfect. The effectiveness of the proposed methodology is proven by assessing a case study in the state of Tennessee, USA. The results demonstrate that the ash and moisture contents of logging residues affect the performance of the supply chain (in monetary terms). Higher-than-target moisture and ash contents incur in additional quality-related costs. The quality-related costs in the optimal solution (with final ash content of 1% and final moisture of 50%) account for 27% of overall supply chain cost. Based on the numeral experimentation, the total supply chain cost increased 7%, on average, for each additional percent in the final ash content. © 2016 by the authors.


Zaca-Moran P.,Autonomous University of Puebla | Ramos-Garcia R.,National Institute of Astrophysics, Optics and Electronics | Ortega-Mendoza J.G.,Tulancingo Polytechnic University | Chavez F.,Autonomous University of Puebla | And 2 more authors.
Optics Express | Year: 2015

In this work, the simultaneous presence of saturable (SA) and two-photon absorption (TPA) in zinc nanoparticles (ZnNPs) photodeposited onto the core of an optical fiber was studied in the nanosecond regime with the P-scan method using a high gain pulsed erbium-doped fiber amplifier. An analysis based on Mie theory was carried out to demonstrate the influence of the absorption coefficient with the particles sizes in the proximity of surface plasmon resonance (SPR). The shift from TPA to SA has been observed as the irradiance is increased. It was found that for irradiances lower than 5 MW/cm2, TPA is dominant, whereas for irradiances higher than 5 MW/cm2, the SA becomes dominant. Furthermore, the values of the nonlinear absorption coefficient and the imaginary part of third-order nonlinear optical susceptibility were calculated numerically from the transmittance measured. Such TPA makes ZnNPs a candidate for optical limiting applications, and SA makes them a candidate for applications in pulsed fiber laser systems. ©2015 Optical Society of America.


Enriquez C.,Tulancingo Polytechnic University | Gomez P.,National Institute of Astrophysics, Optics and Electronics
IEEE Latin America Transactions | Year: 2015

Staff training is fundamental for small software organizations; their daily management depends upon its software engineers quickly dominate state-of-the-art methodologies. In this paper, we fully explain a recently introduced model for improving the capability and maturity of training processes in software methodologies. This model, known as CAAM (acronym in Spanish for: "Training Model of Agile Environments under Moprosoft"), is particularly suited for small companies that are willing to or have been verified in level 1 of the Mexican standard NMX-1-059/02-NYCE-2005. Such standard regulates software development companies and it is based on Moprosoft, a capability-maturity model specially developed for Mexico. CAAM focuses on areas related to planning activities for agile development environments, communications with customers and the use of agile testing tools. © 2015 IEEE.


Hernandez-Martinez E.G.,Tecnologico de Estudios Superiores | Albino J.M.F.,Tulancingo Polytechnic University
Proceedings of the IEEE International Conference on Control Applications | Year: 2011

The main goal of formation control strategies is to coordinate a robot team to achieve a desired formation pattern. Some applications of formation control, for instance sensing coverage, searching and rescue, transportation of large objects, etc. require to establish the desired positions of the robots according to an strategic and equidistant spatial coverage within the work area or boundary. This paper presents a hybrid architecture where a SOM neural network establishes the strategic positions of a 2D area or perimeter using the formation graph of robots. This information is transmitted online to a low-level control strategy based on artificial potential functions which ensures the convergence to the desired formation and collision avoidance based on decentralized repulsive vector fields instead the common repulsive potential functions. Some numerical simulations with virtual reality show the performance of the control architecture. © 2011 IEEE.


Suarez-Cansino J.,Autonomous University of the State of Hidalgo | Morales-Manilla L.R.,Tulancingo Polytechnic University | Lopez-Morales V.,Autonomous University of the State of Hidalgo
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015

The design of a Computer Adaptive Testing (CAT) system assumes the existence of an item pool containing properly calibrated items. The calibration is based on an Item Characteristic Curve (ICC). In this paper two mathematical ICC models, and how these models properly fit into the concept of extended Rasch specific objectivity, are under analysis. The results make clear that the comparison between two items depends on subdomains of the complete domain of the corresponding ICC’s. The introduced models are also useful to describe the characteristics of skewness and bimodality in the population, where classical models commonly fail. © Springer International Publishing Switzerland 2015.


Valdiviezo-N J.C.,Tulancingo Polytechnic University | Urcid G.,National Institute of Astrophysics, Optics and Electronics
Applied Optics | Year: 2013

This paper introduces a lattice algebra procedure that can be used for the multispectral analysis of historical documents and artworks. Assuming the presence of linearly mixed spectral pixels captured in a multispectral scene, the proposed method computes the scaled min- and max-lattice associative memories to determine the purest pixels that best represent the spectra of single pigments. The estimation of fractional proportions of pure spectra at each image pixel is used to build pigment abundance maps that can be used for subsequent restoration of damaged parts. Application examples include multispectral images acquired from the Archimedes Palimpsest and a Mexican pre-Hispanic codex. © 2013 Optical Society of America.


Tapia R.,Tulancingo Polytechnic University | Aguilar O.,Tulancingo Polytechnic University | Minor H.,Tulancingo Polytechnic University | Santiago C.,Tulancingo Polytechnic University
Electric Power Components and Systems | Year: 2012

This article aims to present the performance of a B-spline neural network scheme for tuning both the reactive power provision controller from synchronous machines and power system stabilizers in multi-machine power systems. The B-spline neural network is an efficient tool to implement the adaptive control voltage and power system stabilizer coordination, with the possibility of carrying out this task on-line, taking into account the systems' non-linearities. One of the main tasks within this context is to estimate the best power system stabilizer's parameters and adjust the proportional-integral parameters for reactive power provision. In this article, this is solved by a neural network algorithm. The applicability of the proposal is demonstrated by simulation on two test systems. Results show that the proposed coordination scheme is comparable to that obtained by a conventional design, without requiring a strict model analysis. © 2012 Taylor and Francis Group, LLC.

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