Repositorio Institucional UCSC (Univ. Católica de la Santísima Concepción)
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Low-frequency radio recombination lines away from the inner galactic plane
Get PDFDiffuse radio recombination lines (RRLs) in the Galaxy are possible foregrounds for redshifted 21 cm experiments. We use EDGES drift scans centered at −26°. 7 decl. to characterize diffuse RRLs across the southern sky. We find that RRLs averaged over the large antenna beam (72° × 110°) reach minimum amplitudes of R.A. = 2–6 hr. In this region, the Cα absorption amplitude is 33 ± 11 mK (1σ) averaged over 50–87 MHz (27 ≥ z ≥ 15 for the 21 cm line) and increases strongly as frequency decreases. Cβ and Hα lines are consistent with no detection with amplitudes of 13 ± 14 and 12 ± 10 mK (1σ), respectively. At 108–124.5 MHz (z ≈ 11) in the same region, we find no evidence for carbon or hydrogen lines at the noise level of 3.4 mK (1σ). Conservatively assuming that observed lines come broadly from the diffuse interstellar medium, as opposed to a few compact regions, these amplitudes provide upper limits on the intrinsic diffuse lines. The observations support expectations that Galactic RRLs can be neglected as significant foregrounds for a large region of sky until redshifted 21 cm experiments, particularly those targeting cosmic dawn, move beyond the detection phase. We fit models of the spectral dependence of the lines averaged over the large beam of EDGES, which may contain multiple line sources with possible line blending, and find that including degrees of freedom for expected smooth, frequency-dependent deviations from local thermodynamic equilibrium (LTE) is preferred over simple LTE assumptions for Cα and Hα lines. For Cα we estimate departure coefficients 0.79 < bnβn < 4.5 along the inner Galactic plane and 0 < bnβn < 2.3 away from the inner Galactic plane
Tourscape role in tourist destination sustainability: A path towards revisit
Get PDFThe tourscape concept is recently coined to represent the general atmosphere experienced by tourists in a destination and includes four dimensions (stimuli): physical, social, socially symbolic, and natural dimensions. Tourist perception of these stimuli is relevant for the development of a tourist destination. This study proposes for the first time that tourscape can also be an important element of the environmental sustainability of a tourist destination when it is in harmony with the environment, since tourscape can play a key role in the tourist experience by eliciting positive intentions and behaviors towards a destination. Based on the stimuli-organismresponse (SOR) model, this study analyzes how tourscape elements influence tourists’ revisit intention when they are perceived to be in harmony with the care of the environment through identification with the tourist destination and trust. The results of a sample of 872 tourists show that each dimension of the tourscape is positively related to destination identification. Furthermore, destination identification is directly related to revisit intention, and indirectly related to revisit intention through trust. This study highlights the implications for destination management organizations, with strategic suggestions on how to increase tourist perception regarding the sustainability of the destination and promote revisit intention
Optical response of Zr2CO2/MoS2 2 CO 2 /MoS 2 van der Waals heterostructures calculated using first-principles calculations
No full textIn the field of material science, the search for a material with an optimal bandgap of approximately 1.40 eV that can act as an efficient photocatalyst for water splitting using solar spectrum irradiation is a noble mission. In this article, we explore the structural, electronic structure, optical and photocatalytic properties of Zr2CO2/MoS2 vdW heterostructures. Our results demonstrates that the Zr2CO2/MoS2 vdW heterostructure can be reliably synthesized. This is due to a minimal lattice mismatch of less than 3%, a negative adhesion energy of -4.23 meV/Å 2, and inherent dynamic stability. The electronic band structure calculations indicate that the Zr2CO2/MoS2 vdW heterostructure is an indirect bandgap semiconductor. We found that the conduction band minimum (CBM) and valance band maximum (VBM) of the heterostructure are located in different monolayers. Furthermore, under −2 % biaxial strain a transition from type-I to type-II (staggered) band alignment occurred. Stacking 2D MoS2 on the Zr2CO2 monolayer results in a vdW heterostructure, and as a result, the HSE calculated bandgap of the Zr2CO2/MoS2 vdW heterostructure in most stable configuration lying in the ideal range for photocatalytic applications. We also studied the heterostructure’s optical properties to understand its response to incident photons with energies up to 14 eV. Based on our findings, Zr2CO2/MoS2 heterostructures are desirable for optoelectronic device applications operated in visible range. Our research offers fresh recommendations for developing novel, highly effective photocatalytic compounds with numerous optical device applications
Configurations of meaning on sexual identity of the academic staff of a University in Southern Chile
Get PDFLa construcción de la identidad sexual es un proceso dialógico y recursivo que los sujetos (re)construyen a lo largo de su trayectoria de vida. Se compone de la identidad de género, el rol de género, el sexo biológico y la orientación sexual. El objetivo de la investigación se centró en describir la configuración de significado de la identidad sexual desde el discurso activo del cuerpo académico de una institución de educación superior de la región del Biobío que forma educadores. El estudio se sustentó en un enfoque interpretativo-cualitativo y un método fenomenológico hermenéutico. Se utilizó una muestra de 10 participantes, a los cuales se les realizó una entrevista semiestructurada. Los sujetos configuran discursos activos centrados en el desarrollo de su autoconcepto de género. Los roles y las funciones que asumen les exigen responder a las expectativas de la comunidad. En conclusión, la identidad sexual es manifestada como un autoconcepto de género
Test–Retest Reliability of an Isometric and Isometric/Vibratory Muscular Strength Protocol with Functional Electro-Mechanical Dynamometry
Get PDFThe purpose of the study was to analyze the test–retest reliability of an isometric and isometric/vibratory muscular strength protocol in the bilateral seated bench press (BSBP), bilateral seated rowing (BSR), unilateral seated right knee extension (USKER), and left knee extension (USKEL) tests controlled using functional electromechanical dynamometry (FEMD) in healthy young adults. A repeated measures design was used to determine the reliability of a muscular strength protocol in isometric and isometric vibration modes with FEMD. No significant differences were found in test–retest analysis (p > 0.05; ES < 0.20); and high reliability (CV = 4.65–5.02%; ICC = 0.99–0.98) was found for BSBP measures, and acceptable reliability (CV = 3.71–9.61%; ICC = 0.98–0.95) was found for BSR, USKER, and USKEL. Furthermore, the coefficients between the two measures were strong (r = 0.963–0.839) and highly significant (p = 0.001) for maximal strength in the isometric and maximal isometric/vibratory assessment of muscle strength in all muscle strength tests. This study demonstrates that isometric and maximal isometric/vibratory strength in the BSBP, BSR, USKER, and USKEL tests can be measured with high reliability and reproducibility using the FEMD
Trabalho colaborativo e co-ensino: sentidos atribuídos pelas equipes de sala de aula
Get PDFEl presente artículo tiene como propósito comprender los sentidos que le otorgan los profesores al trabajo colaborativo al momento de realizar co-enseñanza, focalizados en contextos educativos inclusivos. Estos desafíos tienen relación con la incorporación de estrategias pedagógicas que propicien una educación inclusiva en espacios educativos regulares. El trabajo se desarrolló desde un paradigma interpretativo-comprensivo, con una metodología cualitativa, desde un enfoque fenomenológico, con estudios de casos múltiples. Según lo anterior, el abordaje de la información se efectuó a partir de la hermenéutica reflexiva que contempla el análisis estructural del discurso. El estudio consideró cuatro escuelas municipales de Educación Básica, situadas en la comuna de San Pedro de la Paz, en la región de Biobío (Chile); participaron diez duplas de aula regular, para un total de veinte participantes. Los resultados de la investigación muestran prácticas pedagógicas competitivas e individuales con relaciones profesionales tensas y jerárquicas. A esto se agregan formas de trabajo rutinario y normado con escaso margen a la reflexión y creación pedagógica
Learning to assess foreign language listening: Analyzing the assessment items designed by Chilean pre-service EFL teachers and the cognitive load they experience in this process
Get PDFThe general objective of this study is to analyze the types of items designed by Chilean pre-service EFL teachers to assess listening comprehension skills in English and the cognitive load they experience during the test design process. This study employs a mixed-method design, including 125 Chilean pre-service teachers of English in their third, fourth, and fifth year of professional preparation. As data collection techniques, the participants created a listening comprehension test for secondary education English language learners. Moreover, they completed the Cognitive Load Scale (Leppink et al., 2013). The findings indicate that all pre-service EFL teachers create close and open-ended questions to evaluate students' listening comprehension, focusing on identifying specific information. Fourth and fifth-year pre-service teachers design close and open-ended questions to identify general and specific information, encompassing higher levels of comprehension. On the other hand, regarding the cognitive load experienced by the participants in the test design, they exhibited moderate intrinsic cognitive load, demonstrating that the task was reasonably challenging. The extraneous load was generally low, suggesting minimal external distractions. Notably, the germane load was high across all groups, indicating that the task effectively promoted learning and competency development. Pre-service language teacher education programs should consider these findings to enhance listening assessment practices. Incorporating cognitive load theory can assist teacher candidates in building both pedagogical and disciplinary teaching competencies
Comunicação de crise: respostas e lições em um cenário pós-pandêmica
Get PDFEl objetivo de esta investigación fue identificar las formas en que la crisis provocada por la pandemia del Covid 19 impactó en los sistemas de gestión de comunicación interna de crisis en empresas de Ecuador, Colombia y Chile, y vislumbrar las enseñanzas que este proceso dejó para las organizaciones. Para ello, se aplicó una metodología cualitativa mediante el uso de entrevistas semiestructuradas a 11 jefes de comunicación de las empresas en estudio. Los hallazgos mostraron que las empresas abordaron sus sistemas de comunicaciones internas de manera más estratégica con el doble objetivo de salvar vidas y mantener en funcionamiento a sus organizaciones. A través de la comunicación interna estratégica de crisis como subsistema de comunicación organizacional, las empresas no solo mostraron una gran capacidad de adaptación tecnológica en el uso de los canales de comunicación, sino también una mayor integración entre sus esfuerzos de comunicación organizacional para construir confianza con sus públicos clave y salvaguardar su reputación durante la pandemia. Las lecciones de la gestión de crisis en este periodo posibilitan a los gerentes y encargados de comunicación establecer estrategias para afrontar futuras crisis como parte de su aprendizaje organizacional y mejoramiento continuo
Case Imark Group S.A.S. (IGS)
No full textImark group S.A.S is a micro-company dedicated for 13 years to advising multiple Colombian companies in advertising communication, organizational communication, as well as in providing digital and lithographic printing solutions and sale of promotional material. The company has also provided advice on research of markets and design of digital marketing campaigns.The objective of this work is to show how, from a consultancy to a Colombian microenterprise, a strategic direction is formulated and how to relate it to business results in terms of better competitiveness, in this case of the company IMARK SAS. This work was carried out with the support of the owner of the company, the participation of the General Management and the accounting and financial support staff.The activities that were carried out through the application of the corporate strategic management (CSM) model which allowed the companies to structure their medium-term strategic direction and short-term action plan
Tejiendo hilos verdes: La educación ambiental como pilar de la enseñanza de las ciencias sociales
Get PDFEn este capítulo se fundamentan los beneficios y desafíos de la incorporación de la educación ambiental en la enseñanza de las Ciencias Sociales, subrayando el modo en que esta integración puede mejorar la formación del alumnado. Metodológicamente, este estudio se sustenta en una revisión de alcance de publicaciones de diversas bases de datos, tales como Latindex, Wos, Scopus, Scielo, Clacso, Redalyc, ProQuest y Dialnet. Se adoptó un enfoque cualitativo bajo un paradigma humanista, utilizando un método inductivo, diseño narrativo de tópico y un enfoque interpretativo. Los hallazgos revelan que la inclusión de la educación ambiental puede contribuir significativamente a una comprensión más holística y contextualizada de los fenómenos históricos y sociales, y a promover una conciencia crítica sobre los desafíos ambientales contemporáneos. Se concluye que la educación ambiental asume un rol fundamental para preparar a las futuras generaciones a enfrentar los retos ambientales, con una perspectiva informada y comprometida