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Quinones J.,Instituto Del Mar Del Peru | Llapapasca M.,University of Antofagasta | Ordt F.V.,Saint Ignatius of Loyola University | Paredes E.,Instituto Del Mar Del Peru
South American Journal of Herpetology | Year: 2015

Preliminary findings regarding black turtle (Chelonia mydas agassizii) occurrence in Lobos de Tierra Island, Northern Peru showed that 95% and 5% of turtles were juveniles and sub-adults, respectively, with an overall mean curved carapace length of 57.5 ± 7 cm (26.0-74.4 cm, n = 199). A total mean density of 180.4 turtles/km2 was found with highest densities found in bays and inlets located in the southeast. Inshore densities in shallow waters (< 1.5 m) were almost one order of magnitude greater than offshore at ∼ 1.5 km. In addition, based on structured qualitative interviews with fishermen, sea turtle capture and consumption still exists in the island, though occasional and sporadic. Jellyfish (Chrysaora plocamia) and green algae (Ulva sp.) consumption plays an important role in black turtle aggregations in the island, where densities are quite high compared to other feeding grounds elsewhere. We conclude that Lobos de Tierra constitutes an important Peruvian feeding ground, with high black turtle aggregations, close to the northern limit of the cold Humboldt Current. © 2015 Brazilian Society of Herpetology.

Cardenas-Quintana H.,Federico Villarreal National University | Roldan Arbieto L.,Saint Ignatius of Loyola University
Revista Chilena de Nutricion | Year: 2013

Objective: To determine the nutritional status of non-institutionalized elderly (NE) and their relationship with different socioeconomic conditions. Method: 300 NE residents of Metropolitan Lima from different socioeconomic levels were randomly selected. The nutritional status was determined using Body Mass Index (BMI) and brachial perimeter. The NE was classified according to BMI: normal from 22 to 27, overweight from 27.1 to 29.9 and obesity ≥ 30 kg/m2. The dietary intake was evaluated with a reminder survey of 24 hours. Results: The prevalence of overweight was 48.3% (26% overweight and 22.3% obese) without significant differences between socioeconomic levels (SS) (p=0.088). Greater obesity in women than in men was observed with significant differences between SS (p=0.030). The highest prevalence of obesity was observed in females of SS medium (32%). The SS significantly influenced lipid consumption, vitamin C and calcium. The consumption of energy, protein, carbohydrates, fiber, iron and phosphorus, did not differ significantly with SS. Conclusions: The nutritional status and nutrient intake of NE showed no relation with socioeconomic level.

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.

Sotomayor S.,Saint Ignatius of Loyola University | Barbieri C.,North Carolina State University | Wilhelm Stanis S.,University of Missouri | Aguilar F.X.,University of Missouri | Smith J.W.,North Carolina State University
Environmental Management | Year: 2014

This study explores the importance of different motivations to visit three types of recreational settings-farms, private forests, and state or national parks. Data were collected via a mail-back questionnaire administered to a stratified random sample of households in Missouri (USA). Descriptive and inferential statistics reveal both similarities and discontinuities in motivations for visiting farms, private forests, and state or national parks for recreation. Being with family, viewing natural scenery, and enjoying the smells and sounds of nature were all highly important motivations for visiting the three types of settings. However, all 15 motivations examined were perceived to be significantly more important for visits to state or national parks than to farms or private forests. Findings suggest that individuals are more strongly motivated to recreate at state and national parks relative to farmlands or forests. Post hoc paired t tests comparing motivations between both agricultural settings (farms and private forests) revealed significant differences in eight different recreational motivations. Individuals tended to place more importance on the ability to use equipment and test their skills when considering recreating on private forests. Conversely, social motivations (e.g., doing something with the family) were more important when individuals were considering recreating on farmland. Collectively, the findings suggest individuals expect distinctly different outcomes from their visits to farmlands, private forests, or state or national parks. Consequently, all three types of recreational settings have competitive advantages that their managers could capitalize on when making decisions about how to attract new visitors or produce the most desirable experiences for current recreationists. © 2014 Springer Science+Business Media.

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.

Pacheco M.P.,Saint Ignatius of Loyola University | Velazquez M.G.N.,Research Center en Quimica Aplicada | Escamilla G.C.,Research Center Cientifica Of Yucatan Ac
Revista Latinoamericana de Metalurgia y Materiales | Year: 2016

In this work we have studied the permeability of polymer films that had a core and shell composed by polystyrene and poly (butyl acrylate) in a mass relation of 40 and 60, respectively. Permeability coefficient measurements were made in the Permeation Chamber "Voyager". The permeated gases were nitrogen, oxygen, methane and carbon dioxide at a temperature of 35 °C and pressures of 2 and 4 atmospheres. According to the results, the permeabilities of the films using latex obtained by polymerization in microemulsion were lower compared to those obtained using latex core-shell polymer obtained by emulsion polymerization and this is due to that smaller diameter nanoparticles were obtained by microemulsion polymerization than those obtained by emulsion. Also, a direct relationship between the coefficient of permeability of gases with critical temperatures of the gases was found.

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.

Paucar L.G.,Saint Ignatius of Loyola University | Diaz A.R.,Saint Ignatius of Loyola University | Viani F.,University of Trento | Robol F.,University of Trento | And 2 more authors.
Mediterranean Microwave Symposium | Year: 2016

The pervasiveness property of wireless sensor network technology makes it suitable to collect heterogeneous sensor data in the application field of precision agriculture. On the basis of the collected data, smart and adaptive irrigation strategies have been proposed to estimate the optimal water quantity needed by cultures. This paper is aimed at presenting a wireless system architecture for smart irrigation, which adaptively evaluates the irrigation time according to the environmental conditions. A selected set of experimental results are presented to show the potentialities of the system to adaptive control the irrigation procedure toward water saving and product quality optimization. © 2015 IEEE.

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