Campeche Institute of Technology
Campeche, Mexico
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Xaman J.,CENIDET | Esquivel-Ramon J.,Campeche Institute of Technology | Chavez Y.,CENIDET | Hernandez-Perez I.,CENIDET
Mechanics and Industry | Year: 2017

In this paper the design of a cut bar system to determine the thermal conductivity of conductive solid materials is presented. The system works under the comparative method, therefore two reference samples with known thermal conductivity are needed. The thermal design consisted on defining the physical configuration of the thermal system, materials to use and their dimensions, in order to evaluate their thermal performance by varying these parameters to calculate the maximum percentage design error. Given that the thermal design was parametric, the finite volume method was used to solve the heat conduction equation in the cut bar system, which allowed us to vary the different parameters that make up the thermal system such as length and diameter of the bars, insulation thickness, type of reference material, etc. The numerical code developed was verified with one analytical solution. It was found that, the thermal design of a cut bar instrument to determine the thermal conductivity of solid materials within the interval 0.58 ≤ λ ≤ 429 W.m-1.K-1 shows a maximum design error of 3.77% associated to the length of the sample material. The results in this paper allow one to kwon the error by design which can be taken into account as a source of uncertainty when determining the thermal conductivity of solid materials. © 2016 AFM, EDP Sciences.

Rios-Soberanis C.R.,Research Center Cientifica Of Yucatan | Rodriguez-Laviada J.,Research Center Cientifica Of Yucatan | Perez-Pacheco E.,Campeche Institute of Technology | Sakai T.,Saitama University | Wakayama S.,Tokyo Metroplitan University
MATEC Web of Conferences | Year: 2017

The common textile architecture/geometry are woven, braided, knitted, stitch boded, and Z-pinned. Fibres in textile form exhibit good out-of-plane properties and good fatigue and impact resistance, additionally, they have better dimensional stability and conformability. Besides the nature of the textile, the architecture has a great role in the mechanical behaviour and mechanisms of damage in textiles, therefore damage mechanisms and mechanical performance in structural applications textiles have been a major concern. Mechanical damage occurs to a large extent during the service lifetime consequently it is vital to understand the material mechanical behaviour by identifying its mechanisms of failure such as onset of damage, crack generation and propagation. In this work, textiles of different architecture were used to manufacture epoxy based composites in order to study failure events under tensile load by using acoustic emission technique which is a powerful characterization tool due to its link between AE data and fracture mechanics, which makes this relation a very useful from the engineering point of view. © The Authors, published by EDP Sciences, 2017.

Balan-Ortiz C.A.,Autonomous University of Campeche | Luna Brito M.,Autonomous University of Campeche | Perez Lopez T.,Autonomous University of Campeche | Camacho-Chab R.J.,Campeche Institute of Technology
Revista Mexicana de Ingeniera Quimica | Year: 2017

There are several ways to analyze electrochemical noise signals (RE) to observe the activity at the metal - electrolyte interface. Due that records are available at discrete time periods, the most common way to examine the data is through the application of statistical methods in the time domain. These methods can be classified based on their usefulness in those which seek to quantify the magnitude of the corrosion process (standard deviations), highlighting the use of noise and resistance in trying to extract information about the mechanism of the corrosion process itself, based on the assumption that the shape of the temporary registers are a reflection of the behavior of the metal - electrolyte interface. Among these is possible to mention the average value, the bias, the kurtosis, and pitting index, which may reflect changes in the corrosion mechanism. This paper presents the statistical treatment of the data obtained from specimens with RE steel embedded in concrete made with NaCl (Cl), NaCl + NaNO2 (I) without addition of NaCl (S) in the mixing water and exposed to an average natural marine. © 2017, Universidad Autonoma Metropolitana Iztapalapa. All rights reserved.

Buenfil C.,Campeche Institute of Technology | Romero E.,Polytechnic University of Catalonia | Lloret A.,Polytechnic University of Catalonia | Gens A.,Polytechnic University of Catalonia
E3S Web of Conferences | Year: 2016

Compaction induces anisotropy on soil deformational response due to preferential straining associated with the fabrication process. An experimental insight into the stress-strain response of Barcelona clayey silt is provided here. The material was statically compacted at low dry density to induce high collapsibility upon wetting (dry density 1.48 Mg/m3, water content 12%). Two types of controlled-suction tests were carried out: a) constant suction radial paths on as-compacted samples following different stress ratios (deviator stress/mean net stress: q/p″, including isotropic and K0 stress paths; and b) the same type of radial stress paths but performed after saturation under low confining stress. These paths were intended to define the as-compacted and saturated yield surfaces. The experimental data on as-compacted state is satisfactorily interpreted adopting an anisotropic yield surface with an inclination linked to the compaction under oedometer conditions. Development of shear strain was observed during isotropic loading of the compacted samples. This anisotropy that the soil exhibits at the end of the compaction vanishes after collapse by saturation and as plastic volumetric straining develops. © 2016 The Authors.

Pino J.,Institute Investigaciones para la Industria Alimenticia | Moo-Huchin V.,Campeche Institute of Technology | Sosa-Moguel O.,Technological Institute of Mérida | Sauri-Duch E.,Technological Institute of Mérida | Cuevas-Glory L.,Technological Institute of Mérida
International Journal of Food Properties | Year: 2017

Lucuma hypoglauca Standley, locally named choch, is apparently native from Southern Mexico, but is also cultivated in Central and South America. The fruit is consumed fresh and it is widely accepted in diverse regional markets. Owing to the great potential of commercialization as an exotic fruit, it is important to analyze the aroma of this fruit. The objective of this present study was to analyze the volatile compounds causing the aroma of choch fruit. The volatile compounds of choch fruit were isolated by simultaneous distillation-solvent extraction (SDE) and analyzed by gas chromatography-flame ionization detector and gas chromatography-mass spectrometry. A total of 30 volatile constituents were detected, which represented 2.31 mg kg−1 of the fruit. The composition of the volatile constituents of the fruit included 12 ketones (27.5% of the total volatile composition), seven terpenes (64.8%), four esters (4.1%), four alcohols (2.2%), two aldehydes (1.1%), and a sulfur compound (0.4%). The major compounds were (E)-β-caryophyllene (56.3% of the total volatile composition), with lesser amounts of 3-hydroxy-2-butanone (6.1%), 2-pentanone (5.6%), and (E)-3-penten-2-one (5.6%). By application of odor activity values (OAVs), six constituents were considered as aroma-active volatiles, of which the most important were (E)-3-penten-2-one, (E)-β-caryophyllene, methional, 3-methylbutanal, 3-heptanone, butanal, and 3-hexanone. © 2017 Taylor & Francis Group, LLC

Moo-Huchin V.M.,Campeche Institute of Technology | Estrada-Mota I.,Campeche Institute of Technology | Estrada-Leon R.,Campeche Institute of Technology | Cuevas-Glory L.,Technological Institute of Mérida | And 4 more authors.
Food Chemistry | Year: 2014

The aim to the study was to determine the physicochemical composition, bioactive compounds and antioxidant activity of fruits from Yucatan, Mexico such as star apple, cashew, mombin, mamey sapote, white sapote, sugar apple, sapodilla, dragon fruit, nance, ilama, custard apple, mamoncillo and black sapote. The physicochemical characteristics were different between fruits and were good sources of bioactive compounds. The edible part with the highest values of antioxidant activity were mamoncillo, star apple, mombin, cashew, white sapote, ilama, custard apple, sugar apple, and nance. Total soluble phenols content showed a correlation with antioxidant activity by ABTS (R = 0.52, P ≤ 0.05) and DPPH (R = 0.43, P ≤ 0.05). A high correlation was obtained between the two assays (ABTS and DPPH) used to measure antioxidant activity in the tropical fruit species under study (R = 0.82, P ≤ 0.05). The results show promising perspectives for the exploitation and use of tropical fruits studied with significant levels of nutrients and antioxidant activity. © 2013 Elsevier Ltd. All rights reserved.

Moo-Huchin V.M.,Campeche Institute of Technology | Moo-Huchin M.I.,Technological University of Mexico | Estrada-Leon R.J.,Campeche Institute of Technology | Cuevas-Glory L.,Technological Institute of Mérida | And 4 more authors.
Food Chemistry | Year: 2015

The aim of this study was to determine the antioxidant compounds, antioxidant activity and content of individual phenolic compounds of freeze-dried peel from three tropical fruits grown in Yucatan, México: purple star apple (Chrysophyllum cainito L.), yellow cashew and red cashew (Anacardium occidentale). The freeze-dried peels were good source of antioxidant compounds. ABTS and DPPH values in the peel from each fruit were 3050.95-3322.31 μM Trolox/100 g dry weight (DW) or 890.19-970.01 mg of vitamin C/100 g DW, and 1579.04-1680.90 μM Trolox/100 g DW or 340.18-362.18 mg of vitamin C/100 g DW, respectively. Six phenolic compounds were identified in the peel from the tropical fruits studied: ferulic, caffeic, sinapic, gallic, ellagic and myricetin. This study demonstrated that freeze-dried peels from purple star apple, yellow cashew and red cashew, could serve as potential sources of antioxidants for use in food and pharmaceutical industries. © 2014 Elsevier Ltd. All rights reserved.

Perez-Pacheco E.,Campeche Institute of Technology | Moo-Huchin V.M.,Campeche Institute of Technology | Estrada-Leon R.J.,Campeche Institute of Technology | Ortiz-Fernandez A.,Campeche Institute of Technology | And 3 more authors.
Carbohydrate Polymers | Year: 2014

In this paper, the Ramon starch was isolated and its chemical composition and physical and microscopic characteristics were determined. Corn starch was used as reference. In general, the proximal composition was similar between starches studied. Ramon starch granules were oval-spherical and rounded with sizes between 6.5 and 15 μm. Starch purity was high (92.57%) with amylose content of 25.36%. The gelatinization temperature was 83.05 C and transition enthalpy was 21.423 J/g. At 90 C, solubility was 20.42%, swelling power 17.64 g water/g starch and water absorption capacity was 13 g water/g starch. The pH, clarity and color (Hue angle) of Ramon starch were higher to those reported for corn starch. The results achieved suggest that Ramon starch has potential for application in food systems requiring high processing temperatures and it is also a promising option for use in the manufacture of biodegradable materials. © 2013 Elsevier Ltd. All rights reserved.

Perez-Pacheco E.,Campeche Institute of Technology | Cauich-Cupul J.I.,Research Center Cientifica Of Yucatan | Valadez-Gonzalez A.,Research Center Cientifica Of Yucatan | Herrera-Franco P.J.,Research Center Cientifica Of Yucatan
Journal of Materials Science | Year: 2013

A carbon fiber/epoxy unidirectional laminated composite was exposed to a humid environment and the effect of moisture absorption on the mechanical properties and failure modes was investigated. The composites were exposed to three humidity conditions, namely, 25, 55, and 95 % at a constant temperature of 25 C. The carbon fiber-epoxy laminated composites for two different carbon fiber surface treatments were used. The results showed that the mechanical properties differ considerably for each fiber surface treatment. The application of a coupling agent enhanced the fiber-matrix adhesion and reduced dependence of the properties on humidity. The damage mechanism observed at micromechanical level was correlated to acoustic emission signals from both laminated composites. The untreated carbon fiber failure mode was attributed to fiber-matrix interfacial failure and for the silane-treated carbon fiber reinforced epoxy laminate attributed to matrix yielding followed by fiber failure with no signs of fiber-matrix interface failure for moisture contents up to 1.89 %. © 2012 Springer Science+Business Media New York.

Estrada-Leon R.J.,Campeche Institute of Technology | Magana-Monforte J.G.,Autonomous University of Yucatán | Segura-Correa J.C.,Autonomous University of Yucatán
Tropical Animal Health and Production | Year: 2014

The genetic parameters for Brahman cattle under the tropical conditions of Mexico are scarce. Therefore, heritabilities, additive direct and maternal correlations, and genetic correlations for birth weight (BW) and 205 days adjusted weaning weight (WW205) were estimated in four Brahman cattle herds in Yucatan, Mexico. Parameters were estimated fitting a bivariate animal model, with 4,531 animals in the relationship matrix, of which 2,905 had BW and 2,264 had WW205. The number of sires and dams identified for both traits were 122 and 962, respectively. Direct heritability estimates for BW and WW205 were 0.41 ± 0.09 and 0.43 ± 0.09, and maternal heritabilities were 0.15 ± 0.07 and 0.38 ± 0.08, respectively. Genetic correlations between direct additive and maternal genetic effects for BW and WW205 were -0.41 ± 0.22 and -0.50 ± 0.15, respectively. The direct genetic, maternal, and phenotypic correlations between BW and WW205 were 0.77 ± 0.09, 0.61 ± 0.18, and 0.35, respectively. The moderate to high genetic parameter estimates suggest that genetic improvement by selection is possible for those traits. The maternal effects and their correlation with direct effects should be taken into account to reduce bias in genetic evaluations. © 2014 Springer Science+Business Media Dordrecht.

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