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Ramirez-Delreal T.A.,University of Guadalajara | Ramirez-Delreal T.A.,Polytechnic University of Aguascalientes | Mora-Gonzalez M.,University of Guadalajara | Casillas-Rodriguez F.J.,University of Guadalajara | And 2 more authors.
Optics Express | Year: 2017

Phase-shifting is one of the most useful methods of phase recovery in digital interferometry in the estimation of small displacements, but miscalibration errors of the phase shifters are very common. In practice, the main problem associated with such errors is related to the response of the phase shifter devices, since they are dependent on mechanical and/or electrical parts. In this work, a novel technique to detect and measure calibration errors in phase-shifting interferometry, when an unexpected phase shift arises, is proposed. The described method uses the Radon transform, first as an automatic-calibrating technique, and then as a profile measuring procedure when analyzing a specific zone of an interferogram. After, once maximum and minimum value parameters have been registered, these can be used to measure calibration errors. Synthetic and real interferograms are included in the testing, which has thrown good approximations for both cases, notwithstanding the interferogram fringe distribution or its phase-shifting steps. Tests have shown that this algorithm is able to measure the deviations of the steps in phase-shifting interferometry. The developed algorithm can also be used as an alternative in the calibration of phase shifter devices. © 2017 Optical Society of America.


Santiesteban-Cos R.,Tecnologico Nacional de Mexico | Garate-Garcia A.,Polytechnic University of Aguascalientes | Montano-Godinez O.,2J Antennas United States Corporation
International Journal of Control, Automation and Systems | Year: 2017

A family of continuous state feedback synthesis based on sliding mode control is analyzed using a Lyapunov approach, such that the compensation of growing perturbations together with state variables is shown. Robustness properties of a family of controllers, varying from the well known twisting sliding mode control law to the PD controller, are studied. A non-smooth Lyapunov function is proposed such that global finite-time stability of the origin is demonstrated and tuning rules for the control gains are obtained. Moreover, since the Lyapunov function is strict, an upper bound for the convergence time of the closed loop system can be estimated, in spite of the growing perturbations with respect to the state. To illustrate the performance and robustness properties of the feedback synthesis, experimental results are presented, using a one-link pendulum as a test bed. © 2017 Institute of Control, Robotics and Systems and The Korean Institute of Electrical Engineers and Springer-Verlag Berlin Heidelberg


Padilla T.,Polytechnic University of Aguascalientes | Ochoa A.,Autonomous University of Ciudad Juárez | Margain L.,Polytechnic University of Aguascalientes
Advances in Intelligent Systems and Computing | Year: 2016

Serious games have become a motivational engine to get knowledge, skills and fun at the same time. First of all, the player has to feel that he is playing a game where the learning is only a consequence of the playing actions and it is essential to use reliable sources of information to design them in order to obtain the desired results. Tourette syndrome is a neurological disorder poorly understood by society. Through a game is possible to get people’s attention and influence them about the negative effects produced by lack of comprehension, especially in scholar environments. In this paper, we propose the design and development of a serious game as learning tool and generator of interest about Tourette syndrome in a web-based environment. Furthermore, we analyzed the influence of stress level in the appearance of each symptom and we represented how each of them affects the player performance. It serves as an analogy of how patients feel in a social circle as a classroom, when people do not understand the disease implications. © Springer International Publishing Switzerland 2016.


Vignesh V.,Bharathidasan University | Sathiyanarayanan G.,Bharathidasan University | Sathishkumar G.,Bharathidasan University | Parthiban K.,Bharathidasan University | And 2 more authors.
RSC Advances | Year: 2015

In the present study, we report the formulation, characterization, and in vitro antibacterial and cytotoxicity effects of exopolysaccharide (EPS) stabilized iron oxide nanoparticles (FeONPs) against the human epidermoid carcinoma cell line (A431). EPS is extracted from a spore-forming strain of Bacillus subtilis, VT03, isolated from the gut microbiome of the freshwater fish Oreochromis mossambicus (Tilapia). FTIR, 1H NMR and 13C NMR spectroscopic studies show the presence of sugar moieties, confirming that EPS might be a glucan. Later, EPS is used as an eco-friendly reducing and stabilizing agent for the formulation of iron oxide nanoparticles (FeONPs). Initially, the generation of nanoscale FeO was confirmed through the formation of a black-coloured precipitate with an absorbance maxima at 250-300 nm in a UV-visible spectrometer. X-ray diffraction (XRD) planes clearly confirm that the synthesized FeONPs are in the cubic spinel phase. The morphometric features of the synthesized FeONPs are exclusively studied using electron microscopy (FESEM and HRTEM) which shows spherical FeONPs in sizes ranging between 75-120 nm; the mean size was found to be 106 ± 12 nm. Additionally, energy dispersive X-ray analysis (EDAX), selected area emission diffraction (SAED) and dynamic light scattering (DLS) confirms the purity and homogeneity of the synthesized FeONPs. The vibrating sample magnetometer (VSM) technique reveals the presence of both ferro- and antiferromagnetic phases in the EPS-stabilized FeONPs. Further, the inhibitory activity of EPS-stabilized FeONPs against human and fish pathogenic strains such as Aeromonas hydrophila (ATCC 49140), Aeromonas hydrophila (MTCC 1739), Aeromonas sobria (MTCC 3613) and Aeromonas hydrophila (obtained from OIE Reference Laboratory, C. Abdul Hakeem College, Melvisharam) was assessed. The in vitro cytotoxicity effects of free EPS and EPS-stabilized FeONPs were probed in the human epidermoid carcinoma cell line A431. The IC50 values of EPS and EPS-stabilized FeONPs were found to be 350.18 and 62.946 μg ml-1 respectively. Further, acridine orange/ethidium bromide (AO/EtBr) staining of A431 cells at different time intervals clearly distinguishes the live cells and the cells that have undergone apoptotic cell death. In conclusion, our research paves the way for a facile and greener route to synthesize FeONPs at room temperature. On the other hand, this study also proves that the formulated multifunctional hybrid FeONPs have remarkable qualities such as enhanced bioavailability and magnetic properties. This can be developed into a successful theragnostic platform for cancer treatment. This journal is © The Royal Society of Chemistry 2015.


Reyes-Rodriguez J.L.,CINVESTAV | Sathish-Kumar K.,Polytechnic University of Aguascalientes | Solorza-Feria O.,CINVESTAV
International Journal of Hydrogen Energy | Year: 2015

This study investigates the synthesis and characterization of a carbon derived by a simple combustion process of natural camphor. Resulted carbon was subjected to a chemical (HNO3 and KOH) and physical treatment (thermal treatment -TT, liquid Nitrogen treatment - LN2) for surface functionalization. Synthesized carbon materials were used as Pt catalyst support for the oxygen reduction reaction (ORR) in acid media. Physicochemical characterization of the carbon support was performed by multiple techniques such as, SEM, EDAX, FTIR, and Raman spectroscopy. Results conducted to spherical particles of camphor carbon (CC) with 50-60nm in size. The chemical composition revealed a CC without sulfur content. This could be an advantage for avoiding the sulfur poisoning on the Pt surface. FTIR results shows that the oxidative chemical treatment (HNO3 and KOH) incorporate functional group of CO to CC. However, the TT eliminates the functional surface group on the CC. Apparently CC and CC-LN2 samples have the same behaviour, consequently it can be inferred that the cryogenic treatment with liquid nitrogen does not significantly modify the functional chemistry of carbon surface. Raman spectroscopy reveals the disorder in the CC (ID/IG=1.01) which is lesser than the Vulcan Carbon (ID/IG=1.16) defect. Furthermore, the chemically treated CC and LN2 shows fewer defects than the thermally treated CC. Electrochemical results show that materials with enhanced specific catalytic activity toward the ORR follow the tendency: Pt/CC-KOH>Pt/CC-TT>Pt/CC>Pt/CC-LN2>Pt/Vulcan>Pt/C Etek>Pt/CC-HNO3. Our finding results open a new avenue for carbon from natural source as an effective ORR catalyst support. © 2015 Hydrogen Energy Publications, LLC.


Mesalles F.,National Institute of Astrophysics, Optics and Electronics | Villacorta H.,Polytechnic University of Aguascalientes | Renovell M.,LIRMM | Champac V.,National Institute of Astrophysics, Optics and Electronics
Proceedings of the European Test Workshop | Year: 2016

FinFET technology has become the most promising alternative to continue CMOS scaling. However, Finfet design makes use of complex interconnect structures (e.g middle-of-line -MOL- interconnections), and multi-fin and multi-finger devices, which pose a challenge to test open defects. In this paper, open defects at gate locations in FinFET based cells are investigated. The parasitic capacitances of the cells are extracted using Raphael 3D Field Solver. The logic and dynamic behavior of the opens defects is analyzed, and possible defective topologies are defined. Some open locations present behaviors similar to those presented in planar CMOS based circuits. However, most of the open locations present new subtle behaviors. The use of multi-fin and multi-finger devices makes the opens more difficult to detect than in planar CMOS technology and non-detectable opens may pose reliability issues. Hence, a good understanding of the defect behavior is needed in order to develop new test strategies for FinFET based logic circuits to have circuits with higher quality. © 2016 IEEE.


Guzman Mendoza J.E.,Polytechnic University of Aguascalientes | Munoz Arteaga J.,Autonomous University of Aguascalientes | Alvarez Rodriguez F.J.,Autonomous University of Aguascalientes
IEEE Latin America Transactions | Year: 2016

The differences in terms of access and ICT skills between different groups in society have created a problem of digital divide. To overcome this problem, models and strategies are required to achieve a greater impact on the population and that population can develop skills that enhance inclusion in the society knowledge. This work proposes a service-oriented architecture of digital literacy under the Ecosystem Approach that aims to set a new educational paradigm approach to encourage different learning communities to uses new ICT that allows them to be more competitive in todays world and thus shorten the digital divide. Finally, a case study is shown as an implementation of the model in a learning community of librarians in the state of Aguascalientes, México. © 2016 IEEE.


Rivera M.M.,Polytechnic University of Aguascalientes | Ramos M.P.,Polytechnic University of Aguascalientes | Mora J.L.O.,Aguascalientes Institute of Technology
Lecture Notes in Electrical Engineering | Year: 2015

This paper describes a new method for decouple systems with an automatic generator of decoupling blocks using genetic programming and shows that the decoupling of MIMO systems by this method is easier and more powerful than the results obtained using a regular decoupling state feedback technique in a paper production machine process and an irrigation of fields process. © Springer International Publishing Switzerland 2015.


Ortega H.S.,Polytechnic University of Aguascalientes | Ramirez J.L.G.,Polytechnic University of Aguascalientes
IIE Annual Conference and Expo 2014 | Year: 2014

This paper shows how it is possible to add value by using some statistical tools in a process. In this case, it is analyzed the first stage of the value chain in the students' learning process. The first stage is the selection of the students from senior high schools who are willing to study Industrial Engineering. The Universidad Politecnica de Aguascalientes (UPA) requires, as a selection criterion, the average obtained in the senior high school level. However, there is an empirical perception that these averages may not represent the same academic performance; i.e. the rigor in academic terms could be different from school to school though they might be reporting the same average. Therefore, it is presented an analysis of means, standard deviations and quartiles in order to assure the academic performance and to level the pre-university students' average. This analysis was conducted by using the following factors: the average and standard deviation obtained by the last generation in an in-situ preceding course and a national assessment score of pre-university skills, both of them grouped by school. At the end, it was generated a ranking number for decision-making in the selection process.


Castaneda U.Y.Z.,Polytechnic University of Aguascalientes | Ortega H.S.,Polytechnic University of Aguascalientes
IIE Annual Conference and Expo 2014 | Year: 2014

This paper describes a simulation model for improving the manufacturing process of a kitchens and closets manufacturer. Maxiequipos is a small company located in Aguascalientes, Mexico, with more than 20 years of experience in manufacturing and designing kitchens and closets. It offers consulting, installation and maintenance services to its customers as well. After performing a diagnostic to Maxiequipos's manufacturing process, it was found problems on time of delivering and stock inventory, both affect directly to the company reputation which is linked to its profits. It was observed a lack of production control and quality systems, therefore a low correlation between the supply and the demand is also present. For these issues it was proposed to apply a discrete events simulation model as a decision-making tool. By running this simulation it is ensured a minimum investment and substantial savings in time implementation. The result of this work is a structured simulation model which generates different scenarios for improving the manufacturing process of this local company.

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