Development of a mobile application as a didactic strategy to improve english vocabulary in elementary school students

Propose the use of a mobile application as a didactic strategy to improve English vocabulary in elementary studentsThe present research work entitled “Development of a mobile application as a didactic strategy to improve English vocabulary in elementary school students" aimed to propose the use of a mobile application with worksheets as a didactic strategy to improve English vocabulary. A mixed study of quantitative and qualitative tools was applied, with surveys for teachers and students. The results justified that teachers and students of the Unidad Educativa San Roque need to integrate a teaching and learning model based on mobile applications. This analysis allowed the development of the application called "My First English App" and an activity guide in worksheets for teaching English vocabulary to 2nd-grade students. Finally, it is expected that teachers will benefit and see how important apps are in professional works with children.Licenciatur

Prácticas de resistencia para la preservación de la identidad cultural raizal en el Departamento Archipiélago de San Andrés, Providencia y Santa Catalina

La presente investigación tuvo como objeto identificar y evidenciar las prácticas de resistencias utilizadas por la comunidad étnica Raizal para la preservación de su identidad cultural en el departamento Archipiélago de San Andrés, Providencia y Santa Catalina, debido al desplazamiento de personas oriundas de otras ciudades de Colombia que establecieron su residencia en las islas. Dentro de la investigación se implementaron entrevistas semi estructuradas a miembros de la comunidad Raizal a través de un muestreo aleatorio, analizando la información por medio del método de teoría fundada propuesto por Glaser y Strauss. Es necesario comprender que la identidad cultural se teje bajo la concepción de la historia, el contexto, el territorio, las normas sociales, el modo de vida de un pueblo, entre otras, las cuales se entrelazan para que la identidad se construya en cada individuo, permitiendo un arraigo y una significación a la construcción grupal, partiendo de esto nacen las prácticas de resistencia las cuales se establecen a través de la interacción social como herramienta que le lleva a reconocer la preservación de su identidad

Statistical and kinetic study for leaching of covellite in a chloride media

Covellite is a relatively rare copper sulfide with slow dissolution kinetics. The present investigation used the surface optimization methodology to evaluate the effect of three independent variables (time, chloride concentration and sulfuric acid concentration) on the rate of extracting Cu from covellite. The effects of chloride concentration and temperature over time were also studied. An ANOVA indicated that the linear variables of time and chloride concentration have the greatest influence, this being highly representative (R2 = 0.9945). The highest copper extraction rate (71.23%) at room temperature, was obtained with a high chloride concentration (100 g/L), a low concentration of sulfuric acid (0.5 M), and a leaching period of 600 h. The dissolution is described by the model of the unreacted core, the rate of leaching of the covellite is controlled by the chemical surface reaction at temperatures between 50 and 90°C, with concentrations of 0.5 M of H2SO4, 100 g/L of chloride, and a leaching period of up to 6 hours, where an activation energy of 72.36 kJ/mol was obtaine.The authors are grateful for the contribution of the Scientific Equipment Unit-MAINI of the Universidad Católica del Norte for aiding in generating data by automated electronic microscopy QEMSCAN® and for facilitating the chemical analysis of the solutions. We are also grateful to Marina Vargas Aleuy and Carolina Ossandón Cortés of the Universidad Católica del Norte for supporting the experimental tests

Propuesta tecnológica para la extracción de aceite y producción de harina a partir de semilla de jícaro sabanero Crescentia Alata), en el departamento de chontales, en el año 2015

El presente estudio investigativo es elaborado por estudiantes de la UNAN-FAREM-Chontales en colaboración con el INTA (Instituto Nicaragüense de Tecnología Agropecuaria), el cual había formulado un planteamiento metodológico preliminar sobre el procesamiento agroindustrial de la semilla de jícaro. La investigación tiene la finalidad de proponer una tecnología adecuada para el aprovechamiento del jícaro, el cual es un fruto abundante en la zona seca de Chontales con lo cual se puede obtener muchos productos, aunque en este trabajo nos enfocamos en la obtención de aceite y harina con altos valores nutritivos, a partir de la Semilla de Jícaro. Esto representaría una significativa contribución a la seguridad alimentaria de las familias de dichas zonas, generando ingresos y produciendo productos de altos valores nutritivos los cuales son harina y aceite nutritivo. La variedad que se tomó para realizar el trabajo de tesis fue Crescentia Alata porque es la más abundante en la zona seca de Chontales. En el trabajo experimental se visitaron comunidades de la zona seca de Chontales, donde se hicieron observaciones relativas a los requisitos de calidad para el acopio de la materia prima, así mismo se recolectaron frutos para toma de datos y análisis de la semilla. La tecnología propuesta para la extracción de aceite y producción de harina a partir de semilla de jícaro es básicamente semi industrial, procurando que su implementación sea accesible por las familias organizadas empresarialmente en cooperativas. Al final el trabajo se resume en que el aprovechamiento del jícaro para elaborar aceite y harina es un proyecto de gran importancia e innovación en el departamento

Leaching of pure chalcocite in a chloride media using sea water and wastewater

Chalcocite is the most important and abundant secondary copper ore in the world with a rapid dissolution of copper in an acid-chloride environment. In this investigation, the methodology of surface optimization will be applied to evaluate the e_ect of three independent variables (time, concentration of sulfuric acid and chloride concentration) in the leaching of pure chalcocite to extract the copper with the objective of obtaining a quadratic model that allows us to predict the extraction of copper. The kinetics of copper dissolution in regard to the function of temperature is also analyzed. An ANOVA indicates that the linear variables with the greatest influence are time and the chloride concentration. Also, the concentration of chloride-time exerts a significant synergic e_ect in the quadratic model. The ANOVA indicates that the quadratic model is representative and the R2 value of 0.92 is valid. The highest copper extraction (67.75%) was obtained at 48 h leaching under conditions of 2 mol/L H2SO4 and 100 g/L chloride. The XRD analysis shows the formation of a stable and non-polluting residue; such as elemental sulfur (S0). This residue was obtained in a leaching time of 4 h at room temperature under conditions of 0.5 mol/L H2SO4 and 50 g/L Cl.The authors are grateful for the contribution of the Scientific Equipment Unit- MAINI of the Universidad Católica del Norte for aiding in generating data by automated electronic microscopy QEMSCAN® and for facilitating the chemical analysis of the solutions. We are also grateful to the Altonorte Mining Company for supporting this research and providing slag for this study, and we thank to Marina Vargas Aleuy and María Barraza Bustos of the Universidad Católica del Norte for supporting the experimental tests

An unusual imported case of diphyllobothriosis in Mexico

The aim of the present study was to estimate the relative contribution of immunogenetic and microbiological factors in the development of recurrent tonsillitis in a Mexican population. Patients (n = 138) with recurrent tonsillitis and an indication of tonsillectomy (mean age: 6.05 years ± 3.00; median age: 5 years, female: 58; age range: 1±15 years) and 195 nonrelated controls older than 18 years and a medical history free of recurrent tonsillitis were included. To evaluate the microbial contribution, tonsil swab samples from both groups and extracted tonsil samples from cases were cultured. Biofilm production of isolated bacteria was measured. To assess the immunogenetic component, DNA from peripheral blood was genotyped for the TNFA-308G/A single-nucleotide polymorphism (SNP) and for the IL1B -31C/T SNP. Normal microbiota, but no pathogens or potential pathogens, were identified from all control sample cultures. The most frequent pathogenic species detected in tonsils from cases were Staphylococcus aureus (48.6%, 67/138) and Haemophilus influenzae (31.9%, 44/138), which were found more frequently in patient samples than in samples from healthy volunteers (P < 0.0001). Importantly, 41/54 (75.9%) S. aureus isolates were biofilm producers (18 weak and 23 strong), whereas 17/25 (68%) H. influenzae isolates were biofilm producers (10 weak, and 7 strong biofilm producers). Patients with at least one copy of the IL1B-31*C allele had a higher risk of recurrent tonsillitis (OR = 4.03; 95% CI = 1.27± 14.27; P = 0.013). TNFA-308 G/A alleles were not preferentially distributed among the groups. When considering the presence of IL1B-31*C plus S. aureus, IL1B-31*C plus S. aureus biofilm producer, IL1B-31*C plus H. influenzae or IL1B-31*C plus H. influenzae biofilm producer, the OR tended to infinite. Thus, the presence of IL1B-31*C allele plus presence of S. aureus and/or H. influenzae could be related to the development of tonsilitis in this particular Mexican population

Analysis of tourism in La Palma, using the residents' perceptions

El presente trabajo aborda el estudio del sector turístico de la isla de La Palma bajo la perspectiva de su evolución reciente, los fundamentos de su propuesta de sostenibilidad y la opinión de los residentes. Para ello, se realiza en primer lugar, un análisis de la evolución de diversos indicadores (oferta, demanda y movimientos turísticos de la isla, entre otros). Complementariamente, se analizan los datos obtenidos de una encuesta realizada a los residentes de la isla, sobre diferentes elementos de La Palma como destino turístico. Finalmente, se obtendrán las conclusiones y propuestas a destacar de cara al futuro