Saint Ignatius of Loyola University
La Molina, Peru
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De-Sola J.,Complutense University of Madrid | Talledo H.,Saint Ignatius of Loyola University | Rubio G.,Hospital Universitario 12 Of Octubre | de Fonseca F.R.,Complutense University of Madrid | And 2 more authors.
Frontiers in Psychiatry | Year: 2017

This research aims to study the existing relationships among the factors of state anxiety, depression, impulsivity, and alcohol consumption regarding problematic mobile phone use, as assessed by the Mobile Phone Problem Use Scale. The study was conducted among 1,126 participants recruited among the general Spanish population, aged 16-65 years, by assessing the predictive value of these variables regarding this problematic use. Initially tobacco use was also considered being subsequently refused because of the low internal consistency of the scale used. In general terms, the results show that this problematic use is mainly related to state anxiety and impulsivity, through the dimensions of Positive and Negative Urgency. Considering its predictive value, multiple regression analysis reveals that state anxiety, positive and negative urgency, and alcohol consumption may predict problematic mobile phone use, ruling out the influence of depression. © 2017 De-Sola, Talledo, Rubio and de Fonseca.

Perez F.C.,Amec Foster Wheeler | Ale J.D.,Saint Ignatius of Loyola University
Proceedings of the 5th International Conference on Geotechnical and Geophysical Site Characterisation, ISC 2016 | Year: 2016

In this research a dynamic characterization in function of mean stress of share wave velocities and his corresponding maximum shear modulus (Vs, Gmax) of ROM (run of mine) ore stacking were carried out based on MASW survey. In addition a triaxial compression tests (consolidated undrained, CU of 6″ diameter) have been carried out to determine the mechanical properties of the ROM ore stacking of sandstone crushed material. The study has focused on the understanding of the two-dimensional non-linear dynamic response of a heap leach pad located in a higher seismicity Andean region of Peru. This geostructure modeled in Finite Differences Method software (FLAC, Itasca) was subjected to an Operating Basis Earthquake (OBE) obtained from a spectral matching in the time domain (Abrahamson, 1993). A constitutive Mohr-Coulomb Model with stress-level dependent is used to simulate the stress-strain behavior of the ore material. The slope stability and the permanent deformations at the end of this excitation are evaluated. As well as, the development of the deformations during the earthquake are present here in. © 2016 Australian Geomechanics Society.

Brightsmith D.J.,Texas A&M University | Caceres A.,Saint Ignatius of Loyola University
Biotropica | Year: 2017

Herbivorous animals face shortages of different minerals in different geographic areas. In the Amazon Basin, sodium is often limiting, driving herbivores to seek supplemental sources. In the lowlands of the western Amazon Basin, parrots commonly consume sodium-rich soils at clay licks but lick use varies widely among species, and to date, parrots in the region have not been reported consuming other supplemental sodium sources. We document 11 species of psittacines consuming sodium-rich leaves and trunks of Attalea butyracea palms growing on sodium-rich soils in lowland Peru. Consumed palms had more sodium and less potassium than uneaten A. butyracea palms and other palm species in the area. Among A. butyracea palm parts, sodium and Na:K ratios were highest in trunks (consumed by parrots in 94% of the 387 foraging bouts recorded) and lowest in leaves (consumed in only 14% of foraging bouts). The low potassium and high Na:K ratio suggest that birds may be seeking not just any sodium sources, but those low in potassium, as potassium is known to exacerbate dietary sodium shortages. Use of the palms and species' abundance in the study area were not correlated. Instead, parrot species that consumed palms the most were those that use relatively few traditional soil clay licks. This finding suggests that parrot species in the region have fundamental differences in preferred strategies for obtaining supplemental sodium and may help explain documented interspecific differences in geophagy. © 2017 The Association for Tropical Biology and Conservation.

Cardenas-Quintana H.,Agrarian National University | Cardenas-Quintana H.,Federico Villarreal National University | Roldan-Arbieto L.,Saint Ignatius of Loyola University
Revista Chilena de Nutricion | Year: 2017

Objective: To determine the prevalence of anemia in elderly adults living in Metropolitan Lima (ML), classified according to socioeconomic status (SES). Methods: We sampled 300 elderly residents in Lima using a household sampling plan with uniform distribution in different SES groups. Hemoglobin (Hb) levels were assessed by photometric analysis of capillary blood samples using the HemoCue® system. Anemia was defined using reference values Hb<13 g/dL for males and Hb<12 g/dL for females. Results: The overall Hb (mean ± SD) for men in this elderly population in ML was 13.5±1.8 g/dL compared to 12.7±1.3 g/dL in women. No significant differences in the mean Hb concentration by sex (p= 0.205) were observed. Prevalence of anemia for men and women was 30.5% and 23.8%. The prevalence of anemia in the low, medium and high SES groups was 26.0% (17.3-34.7), 29.0% (20.0-38.0) and 25.0% (16.4-33.6), respectively, (p= 0.801). Conclusions: Anemia prevalence in this elderly metropolitan population was not different among different socioeconomic status groups. © 2017, Sociedad Chilena de Nutricion Bromatologia y Toxilogica. All rights reserved.

Leon F.R.,Saint Ignatius of Loyola University | Morales O.,University of Lima | Vertiz H.,University of Lima
Journal of E-Learning and Knowledge Society | Year: 2017

This study utilized the ten aspects of the Big Five personality system to detect differences in personality traits between attendants of higher education online courses and attendants of higher education face-to-face courses. Distance education theoreticians have formulated hypotheses on the personality traits that make the Autonomy, Connectedness, Diversity, and Openness attributes of the connectivist learning model attractive. 753 participants in executive extension courses of a Peruvian university in Lima (mean age = 34.62 years) filled-in an online questionnaire which included the Big Five Aspect Scales. Whereas none of the Big Five factors discriminated between attendants and non-attendants of online courses, the former emerged as significantly higher in Industriousness (an aspect of Conscientiousness) and lower in Orderliness (the second aspect of Conscientiousness) and Enthusiasm (an aspect of Extraversion) than the latter. Theoretical and practical implications of the findings are addressed and the conduct of confirmatory studies outside Peru and involving MOOCs is recommended. © 2017, Italian e-Learning Association. All rights reserved.

Un Jan A.,Saint Ignatius of Loyola University | Contreras V.,Cantaros Peruanos
Computers in Human Behavior | Year: 2016

The purpose of this paper is to propose a model to anticipate the success in the use of a Knowledge Management System (KMS) by doctoral researchers. Doctoral researchers who are preparing their doctoral dissertation are requested to prepare a tool to manage the knowledge they are collecting. The tool is based on data base techniques, and the researchers will use this tool to collect data about the knowledge they use. Doctoral researchers will perceive satisfaction in the use of this tool, depending on internal aspects that they could previously perceive, such as ease of use, usefulness, or quality. Also, there could be external aspects such as rewards, trust and social norms that could affect the perceived satisfaction. As a conclusion, the correct identification of internal and external aspects can improve the success in the use of a KMS. © 2016 Elsevier Ltd. All rights reserved.

Cisneros F.H.,Saint Ignatius of Loyola University | Paredes D.,Saint Ignatius of Loyola University | Arana A.,Saint Ignatius of Loyola University | Cisneros-Zevallos L.,Texas A&M University
Journal of Agricultural and Food Chemistry | Year: 2014

The effect of roasting of Sacha-inchi (Plukenetia volubilis L.) seeds on the oxidative stability and composition of its oil was investigated. The seeds were subjected to light, medium and high roasting intensities. Oil samples were subjected to high-temperature storage at 60 °C for 30 days and evaluated for oxidation (peroxide value and p-anisidine), antioxidant activity (total phenols and DPPH assay), and composition (tocopherol content and fatty acid profile). Results showed that roasting partially increased oil oxidation and its antioxidant capacity, slightly decreased tocopherol content, and did not affect the fatty acid profile. During storage, oxidation increased for all oil samples, but at a slower rate for oils from roasted seeds, likely due to its higher antioxidant capacity. Also, tocopherol content decreased significantly, and a slight modification of the fatty acid profile suggested that α-linolenic acid oxidized more readily than other fatty acids present. © 2014 American Chemical Society.

Sotomayor S.,Saint Ignatius of Loyola University | Barbieri C.,North Carolina State University
International Journal of Tourism Research | Year: 2016

Surf tourism is a multibillion dollar industry expected to continue expanding. Despite such economic significance, the surf tourism literature has gaps related to surf tourism segments. In response, this study applied the serious leisure framework to profile serious surfers and contrast their sociodemographic composition and travel behaviors. Although more serious surfers are more avid travelers in the quest for the perfect wave as compared with less serious surfers, preference for local attractions and conveniences did not vary between groups. In addition to contributing the scholarship of serious leisure and surf tourism, this study provides insights for the surf tourism industry. © 2015 John Wiley & Sons, Ltd.

Becerra-Castro E.M.,Saint Ignatius of Loyola University | Becerra-Castro E.M.,Agrarian National University | De Araujo L.E.E.,University of Campinas
Journal of the Optical Society of America B: Optical Physics | Year: 2016

We describe cross focusing in a four-level atomic medium under electromagnetically induced transparency. We show that due to the giant Kerr nonlinearity experienced by the atoms, cross focusing between weak signal and probe fields (both fields with intensities below line saturation level) is possible. By applying different intensity masks to the signal field, different lenses (cylindrical, Fresnel, Gaussian) can be induced in the atomic sample. Focusing of the probe beam is analyzed in terms of the excitation parameters (signal Rabi frequency and detuning, as well as optical depth of the atomic medium). © 2016 Optical Society of America.

Gutierrez-Cardenas J.M.,Saint Ignatius of Loyola University
Proceedings - IEEE 38th Annual International Computers, Software and Applications Conference Workshops, COMPSACW 2014 | Year: 2014

Steganography is the art of concealing information within different types of media objects such as images or audio files. Its counterpart, Steganalysis, is the study of methods that uncover information in a suspicious file, which has being altered for stego purposes. Its techniques rely on the inspection of changes at the pixel information level. In this paper, we propose a method for Secret-key Steganography that uses a picture to conceal a message with unaltered pixel information, so it would be secure against Steganalysis inspection techniques. This is possible using a technique derived from code obfuscation using random numbers. In summary, we will modify the stego-key transmitted during the communication process, which maps the information in the unaltered cover image. So the original message will be reconstructed by the receiver using the seeds of Pseudo-Random Number Generators, included in the stego-key. The proposed technique is secure against classical steganalysis attacks because it leaves the original and generated stego images unchanged. © 2014 IEEE.

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