Canul-Reich J.,Juarez Autonomous University of Tabasco |
Frausto-Solis J.,Technological Institute of Ciudad Madero |
Hernandez-Torruco J.,Juarez Autonomous University of Tabasco
Computational and Mathematical Methods in Medicine | Year: 2017
Background. Guillain-Barré Syndrome (GBS) is a potentially fatal autoimmune neurological disorder. The severity varies among the four main subtypes, named as Acute Inflammatory Demyelinating Polyneuropathy (AIDP), Acute Motor Axonal Neuropathy (AMAN), Acute Motor Sensory Axonal Neuropathy (AMSAN), and Miller-Fisher Syndrome (MF). A proper subtype identification may help to promptly carry out adequate treatment in patients. Method. We perform experiments with 15 single classifiers in two scenarios: Four subtypes' classification and One versus All (OvA) classification. We used a dataset with the 16 relevant features identified in a previous phase. Performance evaluation is made by 10-fold cross validation (10-FCV). Typical classification performance measures are used. A statistical test is conducted in order to identify the top five classifiers for each case. Results. In four GBS subtypes' classification, half of the classifiers investigated in this study obtained an average accuracy above 0.90. In OvA classification, the two subtypes with the largest number of instances resulted in the best classification results. Conclusions. This study represents a comprehensive effort on creating a predictive model for Guillain-Barré Syndrome subtypes. Also, the analysis performed in this work provides insight about the best single classifiers for each classification case. © 2017 Juana Canul-Reich et al.
Musial J.,Poznan University of Technology |
Lopez-Loces M.C.,Technological Institute of Ciudad Madero
Foundations of Computing and Decision Sciences | Year: 2017
Internet shopping is one of the main pillars of electronic commerce.According to the literature, the Internet Shopping Optimization Problem (ISOP)has been defined in order to optimize the global cost of online purchase, taking into account both the cost of products and shipping. In this study, it was decided to propose and analyze a very interesting, and really substantial, extension of the ISOP.Namely, trust factors were subjected to careful analysis from the customer point of view. The analysis is based on a specially prepared questionnaire, supplemented by the information from the literature and our own observations. Thus, it was possible to propose a definition of a new mathematical model of the problem, and to prove its affiliation to the class of strongly NP-hard problems. In addition, the heuristic algorithm is proposed, which can be used to solve the problem. © by Jedrzej Musial 2017.
Banda-Cruz E.E.,Technological Institute of Ciudad Madero |
Flores-Gallardo S.G.,Research Center en Materiales Avanzadaos Science |
Rivera-Armenta J.L.,Technological Institute of Ciudad Madero
DYNA (Colombia) | Year: 2017
This research focuses on clay dispersion of commercial Cloisite 10A in recycled PET (RPET) to improve the properties of recycled polymer lost in the reprocessing of materials, specifically during extrusion. Varying mixtures of RPET/Cloisite 10A were prepared in a single screw extruder. The mixtures obtained were reprocessed in capillary rheometer-type single screw extruder and passed through a capillary die, at high shear stress to increase the dispersion of clay in the polymer matrix. Results show physical degradation of materials. X-ray diffraction (XRD) indicated exfoliation of clay with low concentrations. Furthermore, rheology results show that viscosity rate decreases with increase in clay concentration in the mixtures. Scanning electron microscopy (SEM) reveals low dispersion of clay with an increase of concentration. © The author; licensee Universidad Nacional de Colombia.
Garcia-Alamilla P.,Juarez Autonomous University of Tabasco |
Lagunes-Galvez L.M.,Juarez Autonomous University of Tabasco |
Barajas-Fernandez J.,Juarez Autonomous University of Tabasco |
Garcia-Alamilla R.,Technological Institute of Ciudad Madero
Journal of Food Quality | Year: 2017
During cocoa beans roasting, there are physicochemical changes that develop the chocolate quality attributes. Roasting systems have a particular influence on the development of these characteristics, and the effects of operation variables for each system must be evaluated. The objective of this study was to evaluate the effect of roasting time and temperature in a rotatory system on cocoa beans physicochemical parameters of quality as moisture, water activity, pH, total acidity, color (L*, a*, b*), total phenolic content (TPC), and DPPH radical capacity. Cocoa beans were roasted as a function with a central rotatable design with 22 + 5 central points and 4 axial points (−1.414, −1, 0, +1, and +1,414) and a response surface methodology was applied. Temperature and time levels were 110-170°C and 5-65 minutes, respectively. The effect of the variables was nonlinear and modeled with a second-order response polynomial. Roasting time and temperature presented a significative effect (p < 0.05) on the response variables except for both TPC and DPPH radical capacity in aqueous extract. © 2017 Pedro García-Alamilla et al.
Garcia J.C.,University of Huelva |
Zamudio M.A.M.,University of Huelva |
Perez A.,University of Huelva |
De Alva H.E.,Technological Institute of Ciudad Madero |
Lopez F.,University of Huelva
Journal of Chemical Technology and Biotechnology | Year: 2011
BACKGROUND: A central composite experimental design and multiple regression were used to model the production of pulp and paper sheets from a Paulownia fortunei × tormentosa × elongata trihybrid clone. Also, the same experiments were carried out with the solid phase after autohydrolysis of the raw material. RESULTS: The results were compared with those obtained from the solid phase remaining after autohydrolysis of the raw material with a view to optimizing the use of hemicelluloses and cellulose by fractionation. Pulp and paper sheets from the trihybrid clone surpass those from other Paulownia species such as P. fortunei and P. elongata in physical properties such as tensile index (11.6-49.1 Nm g-1), burst index (0.23-2.41 MPa m2 kg-1), tear index (0.71-3.03 mN m2 g-1) and intrinsic viscosity (427-958 cm3 g-1). CONCLUSIONS: The solid phase obtained by autohydrolysis of the Paulownia trihybrid provides pulp and paper sheets comparable in strength-related properties with those of pulp directly produced from the raw material, but using substantially milder operating conditions and with the added advantage that the autohydrolysis treatment provides highly valorizable liquor. © 2011 Society of Chemical Industry.
Moctezuma E.,Autonomous University of San Luis Potosi |
Zermeno B.,Autonomous University of San Luis Potosi |
Zermeno B.,Technological Institute of Ciudad Madero |
Zarazua E.,Autonomous University of Nuevo León |
And 2 more authors.
Topics in Catalysis | Year: 2011
Iron titanate (FeTiO3) obtained from rich titanium and iron mineral presented some absorption of UV light and photocatalytic activity for the degradation of phenol in aqueous solution. However, most of the reactant is converted to carboxylic acids that remain in the reaction mixture because natural ilmenite do not produce enough HO• radicals to completely mineralize the original reactant at the same rate as pure titania (Degussa P25). The XRD analysis of Fe-titania catalysts prepared by simple mixing of FeTiO3 and TiO2 showed that the structure of TiO2 is not modified when small amounts of FeTiO3, in the order of 10% weight, are well mixed with pure titania. Therefore, the photocatalytic activity of these catalysts is not affected by the presence of FeTiO3. But, heavy ilmenite particles induce the separation of the catalysts particles after the photocatalytic degradation processes. © 2011 Springer Science+Business Media, LLC.
Rosas-Caro J.C.,Technological Institute of Ciudad Madero |
Mancilla-David F.,University of Colorado at Denver |
Ramirez-Arredondo J.M.,CINVESTAV |
Bakir A.M.,University of Colorado at Denver
IET Power Electronics | Year: 2012
This study presents a topology for a pulse width modulated (PWM) three-phase voltage regulator that uses only two driving switches, providing high reliability and making the switching stage simpler and cheaper compared with other available configurations. The proposed topology is suitable for voltage regulation on the distribution power system. It is able to regulate the steady-state voltage and to reject voltage variations such as flicker or sags caused by large motors start. In addition, the compensator features a topology free of energy storage elements. The PWM control is based on dc signals, asynchronous from the grid, simpler than the control used for traditional voltage source converters - it does not require a phase-locked loop, and does not involve trigonometric calculations. As a result of this, the controller can be achieved with an analogue controller or a low-cost microcontroller. The proof of concept is performed with a 220 V three-phase voltage regulator, which is simulated and prototyped in the laboratory. © The Institution of Engineering and Technology 2012.
Quiroz-Castellanos M.,Technological Institute of Ciudad Madero |
Cruz-Reyes L.,Technological Institute of Ciudad Madero |
Torres-Jimenez J.,CINVESTAV |
Gomez S. C.,Technological Institute of Ciudad Madero |
And 2 more authors.
Computers and Operations Research | Year: 2014
In this study, the one-dimensional Bin Packing Problem (BPP) is approached. The BPP is a classical optimization problem that is known for its applicability and complexity. We propose a method that is referred to as the Grouping Genetic Algorithm with Controlled Gene Transmission (GGA-CGT) for Bin Packing. The proposed algorithm promotes the transmission of the best genes in the chromosomes without losing the balance between the selective pressure and population diversity. The transmission of the best genes is accomplished by means of a new set of grouping genetic operators, while the evolution is balanced with a new reproduction technique that controls the exploration of the search space and prevents premature convergence of the algorithm. The results obtained from an extensive computational study confirm that (1) promoting the transmission of the best genes improves the performance of each grouping genetic operator; (2) adding intelligence to the packing and rearrangement heuristics enhances the performance of a GGA; (3) controlling selective pressure and population diversity tends to lead to higher effectiveness; and (4) GGA-CGT is comparable to the best state-of-the-art algorithms, outperforming the published results for the class of instances Hard28, which appears to have the greatest degree of difficulty for BPP algorithms. ©2014 Elsevier B.V. All rights reserved.
Barron Cruz A.E.,Technological Institute of Ciudad Madero |
Melo Banda J.A.,Technological Institute of Ciudad Madero |
Mendoza H.,Technological Institute of Ciudad Madero |
Ramos-Galvan C.E.,Technological Institute of Ciudad Madero |
And 2 more authors.
Catalysis Today | Year: 2011
Biodiesel is synthesized via the transesterification of lipid feedstocks with low molecular weight alcohols. Industrially, alkaline bases such as sodium and potassium hydroxides (NaOH-KOH) are used to catalyze the reaction. These catalysts require anhydrous conditions and feedstocks with low levels of free fatty acids (FFAs). Water in the reaction promotes the formation of FFAs, which can deactivate the catalyst and produce soap, an undesirable byproduct. Strong liquid acids are less sensitive to FFAs and can simultaneously conduct esterification and transesterification reactions. Solid catalysts based on Ni and Pt supported on mesoporous materials (SBA-15 and SBA-16) were tested in the synthesis of biodiesel by transesterification of a vegetable oil via acid catalysis. Textural and structural proprieties of the catalysts were characterized by N2 physisorption (BET method), X-ray diffraction (XRD), and Transmission electron microscopy (TEM); the textural properties and XRD results showed the characteristic properties of mesoporous materials. The Cetane Index of the biodiesel obtained was tested and compared against the Cetane Index of conventional petroleum-based diesel. ASTM techniques used as comparison analysis for the synthetic biodiesel showed better properties than conventional diesel. © 2011 Elsevier B.V. All rights reserved.
Mar-Hernandez E.,Technological Institute of Ciudad Madero |
Gonzalez-Escobar M.,CICESE |
International Geology Review | Year: 2012
Tiburon Basin is characterized by a thick sedimentary fill that records the evolution of one of the rift segments of the East Pacific Rise. Its structure corresponds to an echelon pull-apart basin bounded by two dextral-oblique faults. Unlike basins in the southern Gulf of California that are underlain by oceanic crust, rift basins in the northern Gulf of California contain sedimentary thickness (up to 6 km) that masks the structure of the crust. To study the architecture of the Tiburon Basin, two-dimensional, multichannel seismic reflection data collected by Petróleos Mexicanos (PEMEX) in the early 1980s were used. The data base is a grid of lines, 5-20 km apart, with 6s of record in 48 channels. Additional seismic data of the Ulloa 99 project were also interpreted. Our results indicate that the general structural pattern of the Tiburon Basin is controlled by two dextral-oblique faults: De Mar and Tiburon. De Mar lies to the east and ends in elevated basement transferring the stress to the Desemboque fault. The latter borders the incoming basement from the Sonora and Tiburon faults to the west, ending to the north in an antiform. Four structural domains are recognized: (1) the northern Tiburon domain is a high basement that divides the Delfin Basin to the northeast and exhibits extensional folds with their axes parallel to the basement and its flanks; (2) the Libertad domain is a sheared basement high along the margin of Sonora and forms the right step of the Tepoca Basin to the north; (3) the Tiburon central domain defines a broad sag cut by a dense NE-striking pattern of normal faults with opposed dips in the depocentre and abruptly ends to the west against the Tiburon fault; and (4) the southern Tiburon domain forms a basement ramp offshore Isla Tiburon and is controlled by a pattern of NNE-striking normal faults on the south that likely connect at an oblique angle (60) to the De Mar fault. We propose a rhombochasm basin model with more than 6s of sedimentary record in the depocentre, in which the basement is not recorded. The NW-trending faults in the Libertad domain possibly continue towards the Sonora coastal plain. The principal NW-trending dextral faults and the secondary NNE-striking pattern of normal faults cut the shallow strata of this domain. © 2012 Taylor & Francis.