Puebla de Zaragoza, Mexico

Universidad de Las Americas Puebla

Puebla de Zaragoza, Mexico

Universidad de las Américas Puebla , is a Mexican private university located in San Andrés Cholula, Puebla, a suburb of Puebla. The university is known for its programs in Arts and Humanities, Social science, Science and Engineering, and Business and Economics. It is considered to be one of the most prestigious universities in Latin America, having been ranked the best private and single-campus university in Puebla by the newspaper El Universal, as well as being one of the only seven universities in Latin America accredited by the Southern Association of Colleges and Schools. The UDLAP has also been very successful in Mexican collegiate sports; their teams are the Aztecas. Wikipedia.

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Ibarra C.A.,Universidad de Las Americas Puebla
International Economic Journal | Year: 2011

A notable feature of the Mexican economy since the late 1980s was the persistent real appreciation of the peso. The appreciation - a key development that helps to explain Mexico's slow rate of economic growth - took place despite changes in the exchange-rate regime, yet with an unchanging focus of monetary policy on gradually reducing the inflation rate. Thus, the frequent assumption that only real-side variables (as opposed to monetary ones) have a lasting or 'long-run' effect on the real exchange may not suit the recent Mexican case. The paper presents the results of an econometric study of exchange rate determination in Mexico for the period 1990Q1-2006Q4. The study is based on the so-called BEER (Behavioral Equilibrium Exchange Rate) model, which relies on Johansen's cointegration methodology and jointly considers real-side and monetary determinants. The estimation results - in the form of two- and three-equation cointegration models - show that, control-ling for the influence of real-side determinants, the peso-dollar interest differential had a statistically and economically significant long-run effect on the peso's real exchange rate. © 2011 Korea International Economic Association.

Vysloukh V.A.,Universidad de Las Americas Puebla | Kartashov Y.V.,Polytechnic University of Catalonia | Kartashov Y.V.,Russian Academy of Sciences
Optics Letters | Year: 2014

We study resonant mode conversion in parity time (PT)-symmetric multimode waveguides, where symmetry breaking manifests itself in the sequential destabilization (i.e., the appearance of complex eigenvalues) of the pairs of adjacent guided modes. We show that efficient mode conversion is possible even in the presence of the resonant longitudinal modulation of the complex refractive index. The distinguishing feature of the resonant mode conversion in the PT-symmetric structure is a drastic growth of the width of the resonance curve when the gain/losses coefficient approaches a critical value, at which symmetry breaking occurs. We found that in the system with broken symmetry, the resonant coupling between the exponentially growing mode and the stable higher-order one effectively stabilizes dynamically coupled pairs of modes and remarkably diminishes the average rate of the total power growth. © 2014 Optical Society of America

Gonzalez-Oreja J.A.,Universidad de Las Americas Puebla
Biological Conservation | Year: 2011

Impacts of urbanization on ecological systems are expected to increase during the 21st century, and identifying which species may not survive under urban constraints is of practical importance to conservation biology. I study whether a species' biogeographic origin might be a useful predictor of vulnerability to urban pressures, and if this depends on the geographic scale of the study. By means of multivariate ordination analyses and computer intensive, Monte Carlo simulation techniques, I study the patterns of zoogeographical affinity (a proxy for biogeographic origin) of passerine birds living in 14 non-urban (NU) and 11 urban (U) sites throughout Mexico, a biodiversity rich and urbanizing country between the Nearctic and Neotropical Regions; at a regional scale, I also study differences between NU and U sites in the state of Puebla, in the 'Temperate Sierras' ecoregion. Differences in zoogeographical affinities between NU and U sites were statistically significant, and were mainly caused by changes in the number of neotropical and nearctic species. In terms of the 'equivalent number of zoogeographical classes', a useful measure of zoogeographical diversity, bird assemblages in urban settings were less diverse than those simulated by random drawings from the corresponding species pools. In fact, urbanization seems to be provoking the selective removal of neotropical and endemic species from urban assemblages, whereas at the same time retaining more-than-expected nearctic (temperate) species; birds with nearctic affinities could be successful candidates to 'urban exploiters' in the study case. At a landscape scale, results suggest that urbanization is creating holes in the geographic range of both neotropical passerines and birds endemic to Mexico, which are selectively removed by the urban filter, and can be identified as those more heavily threatened by urbanization if proactive strategies to conserve biodiversity in urban ecosystems are not implemented. Among other reasons for the observed patterns, the tropical niche conservatism is invoked as an explanation. © 2010 Elsevier Ltd.

Conde-Hernandez L.A.,Universidad de Las Americas Puebla | Guerrero-Beltran J.A.,Universidad de Las Americas Puebla
Food Chemistry | Year: 2014

Extracts from fresh and dried samples of Mexican pepperleaf (Piper auritum Kunth) and "papalo" (Porophyllum ruderale) were obtained using a stirring or an ultrasound extraction system with five types of solvents (water, 50:50% v/v ethanol:water, 70:30% v/v ethanol:water, 85:15% v/v ethanol:1.5 N HCl, and ethanol). Total phenolic compounds and antioxidant activity were evaluated with the phenol Folin Ciocalteu reagent and the ABTS method, respectively. Total phenolic compounds (PC), trolox (T), and ascorbic acid (AA), in the two herbs, were in the range of 6.79-68.03 mg of galic acid (GA)/g dry solids (d.s.), 4.88-64.99 mg of T/g d.s., and 5.31-49.84 mg AA/g d.s., respectively. Extracts from fresh "papalo", using ultrasound as the extraction system, had the highest amount of total phenolic compounds. The fresh pepperleaf extract, obtained using ultrasound as the extraction method contained the highest amount of antioxidant activity. © 2013 Elsevier Ltd.

Oropeza-Perez I.,Universidad de Las Americas Puebla
Energy Reports | Year: 2016

This work shows a sensitivity analysis of the economic impact of different energy performances of air-conditioning within the Mexican housing sector. For this purpose, a cooling-load calculator program in function of the indoor temperature is developed. The program also calculates the electricity consumption along with the expenditure with the different residential rates of the Mexican Federal Commission of Electricity (CFE, initials in Spanish) set according to the season of the year and zone of the country. After the results onto the national-scale scenario are validated with the literature, a sensitivity analysis is carried out by changing three parameters that are considered as influential on the consumption and which can be considered as energy saving strategies. With these strategies, it is found that the indoor temperature decrease due to the use of a passive cooling system is the most important characteristic to take into account followed by the coefficient of performance (COP) of the air-conditioning and the increase of the comfort temperature set-point, respectively. Thereby, an economic analysis is carried out, finding an annual saving up to 770 USD within a single air-conditioned dwelling having a payback period of 3 years for using a combination of passive cooling techniques and increasing the comfort temperature set-point; or a 2 years payback period if the air-conditioning is changed by a high-efficient equipment. © 2016 The Author

Rosas-Romero R.,Universidad de Las Americas Puebla
Engineering Applications of Artificial Intelligence | Year: 2014

In this paper a method for remote detection of forest fires in video signals from surveillance cameras is presented. The idea is based on learned redundant dictionaries for sparse representation of feature vectors extracted from image patches on three different regions; smoke, sky and ground. A testing image patch is assigned to the region for which the corresponding dictionary gives the best sparse representation during segmentation. To further reduce the presence of misclassified patches, a spatio-temporal cuboid of patches is built around a classified patch to take a majority vote in the set of classes inside the cuboid. To reduce the number of false positives there is a verification process to determine if a region of interest is growing. Theory, results, issues and challenges related to the implementation of the forest fire monitoring system, and performance of the method are presented. © 2014 Elsevier Ltd.

Raynal-Vellasenor J.A.,Universidad de Las Americas Puebla
Journal of Hydrologic Engineering | Year: 2012

The moments (MOM1 and MOM2), maximum likelihood (ML), sextiles (SEX1 and SEX2) and probability weighted moments (PWM1 and PWM2) methods for estimating the parameters and quantiles of the general extreme value (GEV) distribution for the maxima were analyzed and compared by using data generation techniques of the type of distribution sampling experiments. Considering variance, bias, and mean square error criteria of estimates of parameters and quantiles, it is concluded that in general for the sample sizes analyzed 9 ≤ N ≤ 99 and nonexceedance probabilities in the range 0:90 ≤ F ≤ 0:99, the ML method is superior to the other six. However, the simpler methods may be as good depending on the sample size. The PWM2 is a good option to estimate the location and shape parameter, while MOM1 and MOM2 are an alternative when estimating the shape parameter. Thus, for estimating quantiles for N ≤ 19 the MOM1, MOM2, and PWM2 method compares quite well with the ML method, while for N > 19 the PWM2 shows a better performance. When compared with ML, the PWM2 method showed an overall better performance in estimating the quantiles for large negative values of the shape parameter and for small sample sizes. © 2012 American Society of Civil Engineers.

Ibarra C.A.,Universidad de Las Americas Puebla
Journal of International Trade and Economic Development | Year: 2010

Despite two positive developments - the rise of manufactured exports and a prolonged but eventually successful disinflation - Mexico failed to sustain a high rate of economic growth during its free-trade period 1988-2006. The paper argues that the proximate cause of Mexico's growth failure is the low dynamism of investment, which resulted from the high share of maquila (or assembly goods) in manufactured exports and the real appreciation of the peso during disinflation. The argument is supported by two strands of evidence: an aggregate-demand decomposition that measures the contributions of investment and exports to GDP growth, and the estimation by Johansen's methodology of two- and three-equation cointegration models that show the effect of manufactured exports and the real exchange rate on total investment. © 2010 Taylor & Francis.

Mani-Lopez E.,Instituto Tecnologico De Veracruz | Garcia H.S.,Instituto Tecnologico De Veracruz | Lopez-Malo A.,Universidad de Las Americas Puebla
Food Research International | Year: 2012

Salmonella, a food-borne pathogen, has a recurrent incidence in meat and poultry products. Currently, cases of salmonellosis represent very important economic losses in many countries. An alternative for the prevention of Salmonella outbreaks due to consumption of meat and poultry products, are organic acids (acetic, citric, lactic, malic, propionic, and tartaric among others). Organic acids have been utilized for many years for decontamination of beef, pork and poultry products from several bacteria including Salmonella. Current reports describe new treatments with organic acids using the hurdle technology approach to inhibit Salmonella. Also, preventive actions should be taken in order to decrease the appearance of resistant strains of Salmonella as a result of insufficient or sub-lethal treatments with organic acids in meat and poultry products. This review presents general insights on the use of the organic acids to control Salmonella in meat and poultry products. Also, information of the action mechanism, types and doses of treatments, as well as how resistance can occur from improper application of organic acids. © 2011 Elsevier Ltd.

Rodriguez Arana J.M.R.,Universidad de Las Americas Puebla | Mazzoco R.R.,Universidad de Las Americas Puebla
Journal of Hazardous Materials | Year: 2010

The production of granular activated carbon (GAC) basically depends on the correct selection of carbonization temperature, activation ratio and agent (physical or chemical) as well as the raw material. Black cherry, available in Mexico with relative abundance, is of the same genus as the European cherry, whose stones have yielded good GAC production results. Black cherry stones were tried as raw material for GAC production with phosphoric acid as the activating agent. Optimum carbonization temperatures were found to be between 500 and 550°C with an activation ratio of 1.0. g of phosphoric acid/g raw material. Under these conditions the maximum yield was 48.16. g of GAC/100. g black cherry stones. The experimental adsorption parameters fitted into Langmuir's model with a maximum adsorption of 321.75. mg of methylene blue/g GAC and 133.33. mg of phenol/g GAC. Black cherry shells are an abundant agricultural by-product with no uses, and therefore are an alternative for producing GAC. © 2010 Elsevier B.V.

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