Análisis de las estrategias para la solución de una situación problema de dirección y orientación espacial en transición

La investigación vio la necesidad de mejorar los procesos de enseñanza y de aprendizaje de las diferentes nociones espaciales en dirección y orientación, de acuerdo con los planes de estudio elaborados por los maestros. Muestra que aun para los niños de grado transición, es difícil reconocer el uso de las nociones de dirección y orientación espacial, interviniendo aspectos importantes como el uso de estrategias para dar solución a ciertas situaciones, en las cuales se hace necesario tomar como referente fundamental la teoría de la resolución de problemas infantiles en donde utilizan una serie de estrategias de lenguaje propuestas por Jerome Bruner, y Lev Vygostky. La resolución de la situación problema da a conocer las diferentes estrategias usadas por los niños en la solución de una situación problema respecto a la dirección y orientación espacial elaborada bajo las fases de enseñanza de Van Hiele.The research was the need to improve the teaching and learning of different spatial notions direction and guidance, according to the curriculum developed by teachers. It shows that even for children of grade transition, it is difficult to recognize the use of the concepts of direction and spatial orientation, intervening important aspects such as the use of strategies for solving certain situations in which it is necessary to take as the fundamental reference theory of problem solving where children use a range of language strategies proposed by Jerome Bruner, and Lev Vygotsky. The resolution of the problem situation discloses the different strategies used by children in solving a problem situation to the direction and spatial orientation phases prepared under Van Hiele teaching

High repetition rate femtosecond laser heat accumulation and ablation thresholds in cobalt-binder and binderless tungsten carbides

Femtosecond (fs) laser ablation has been studied for the potential of fast, high precision machining of difficult-to-machine materials like binderless tungsten carbide. Obstacles that have limited its efficiency include melting from heat accumulation (HA), particle shielding, and plasma shielding. To address HA without shielding effects, high repetition rate (57.4 MHz), ultra-low fluence fs laser irradiation is performed to study the incubation effect and subsequent HA-ablation threshold of fine-grained tungsten carbides. Exposure times on the order of 100 ms were conducted in air with fluences (1.82 to 9.09 mJ/cm2) two orders of magnitude below the single fs pulse ablation thresholds reported in literature (0.4 J/cm2). Heat accumulation at high repetition rate explains the ultra-low fluence melt threshold behavior resulting in melt crowns around ablated holes and grooves. The results of this study aid in predicting heat buildup in high repetition rate laser irradiation for applications that wish to achieve high ablation rates of difficult-to-machine, ultrahard materials and help enable shaping of binderless tungsten carbide for use in applications too extreme for bindered tungsten carbide

Ultrafast laser welding of ceramics.

Welding of ceramics is a key missing component in modern manufacturing. Current methods cannot join ceramics in proximity to temperature-sensitive materials like polymers and electronic components. We introduce an ultrafast pulsed laser welding approach that relies on focusing light on interfaces to ensure an optical interaction volume in ceramics to stimulate nonlinear absorption processes, causing localized melting rather than ablation. The key is the interplay between linear and nonlinear optical properties and laser energy-material coupling. The welded ceramic assemblies hold high vacuum and have shear strengths comparable to metal-to-ceramic diffusion bonds. Laser welding can make ceramics integral components in devices for harsh environments as well as in optoelectronic and/or electronic packages needing visible-radio frequency transparency

Modelo estructural para evaluar las competencias del desarrollador de software. Structural model to evaluate the competence of the software developer.

Cada vez son más las empresas que recurren a la contratación de proveedores de servicios para realizar actividades “No centrales” en la organización. El propósito del estudio es desarrollar y validar un modelo estructural para evaluar las competencias del desarrollador de software. La evaluación fue realizada mediante la calidad del servicio proporcionado desde la perspectiva de la empresa cliente, cuyos resultados son de 32 empresas que contrataron el servicio de Outsourcing de software. Se utilizó el software SMART–PLS para realizar el análisis estadístico obteniendo una R2: de 0.836 y 0.641 para las variables Preparación empleado–empresa (Y1) y Personal competente actualizado (Y2), respectivamente. Every time more and more companies are turning to hiring service providers for “not central” activities in the organization. The purpose of the study is to develop and validate a structural model to assess the skills of software developer. The evaluation was performed by the service quality provided from the client’s perspective, the results are 32 companies hiring the software Outsourcing service. SMART-PLS software was used to perform statistical analysis to obtain an R2 of 0.836 and 0.641 for the variables: Preparation employee-company (Y1) and updated competent staff (Y2), respectively

Learning a foreign language with a collaborative web-based task, processes and performances. Apprendre une langue étrangère à partir d\u27une tâche collaborative sur Internet : processus et performances

Within language teaching and learning, tasks have been advocated for use as they are thought to set up ideal conditions for language acquisition to occur. With the emergence of the Internet in the last decade, and the deployment of technology in schools, Web-based tasks, referred to as Computer-assisted Language Learning (CALL) are being used by an increasing number of teachers. Teachers who employ Web-based tasks in their classrooms, commonly set these up so that learners complete them in a collaborative mode. This requires learners engaging in a process of task negotiation and, at times, task redefinition, which in turn requires more than just linguistic knowledge from the learners. The purpose of the present research was to identify the impact of Web-based tasks both on the learning process and the learners’ performances. Three intact classes from French high schools, consisting of learners of English as a foreign language, completed a Web-based task. The product of the different stages of its completion and the corresponding video recordings were the database for this study. Attitude questionnaires and cultural awareness tests were also collected and analyzed. In doing so, issues of attitudes and motivation as well as learner competence and language proficiency were examined. These were documented in different experimental settings, including in turn ICT and/or collaboration. The results suggest tasks, whether Web-based or not, do not hinder language production and, in fact, learners respond favourably to them, especially when working collaboratively. Further, the study shows that collaboration has measurable positive effects on the learners’ attitudes, processes and performances. These include: positive outcomes in relation to the learners’ persistence of effort; their involvement with the task; their understanding of the task’s implicit demands; their quality of writing; the products they ultimately produce; and the processing of higher-order skills. Yet the findings also suggest that these benefits are somehow diminished when technology is used, although this in turn is affected by the learners’ familiarity with the tasks and their levels of technological literacy. Even so, these results raise the question of how Web-based tasks can be best implemented in language classrooms, and suggest that further research is still required in this area

HAPI Prevention Bundle: An Initiative to Prevent Hospital-Acquired Pressure Injuries

Problem: Hospital-Acquired Pressure Injuries (HAPI) are a serious health problem as they increase patient morbidity and mortality. They are detrimental to patients, families, and healthcare systems. Context: Research supports HAPI prevention bundles are a way to standardize care processes and reduce the incidence of pressure injuries. This evidence-based practice intervention was initiated to develop a HAPI prevention bundle in an adult Medical-Surgical Telemetry unit. A literature review was conducted to identify the best HAPI prevention practices. Intervention: The evidence-based pressure injury preventive bundle includes interventions consistent with proper skin assessments and documentation, patient risk identification, development of Wound Care Champions, routine huddle attendance, proper education, and continuous training. Measures: Wound, ostomy, and continence nurses, bedside nurses, nurse leaders, and Quality Improvement (QI) specialists participated in the development of the bundle. Nursing questionnaires, chart audits, and interviews were conducted. Pre-implementation HAPI incidences and sentinel events were reviewed. Results: Post-implementation findings will be conducted at 12 months after bundle implementation to determine a significant reduction of HAPI incidence. Conclusion: An evidence-based bundle initiative was developed in an adult Medical-Surgical Telemetry unit to reduce the incidence of HAPIs and standardize the process for pressure injury prevention. Staff engagement and leadership involvement are essential to the success of this EBP intervention. The goal is to integrate the bundle and decrease the number of HAPIs in the unit

Exploring Pyrochlore Host for Upconversion and Downconversion Luminescence Materials

Pyrochlore has been the focal point of research in materials science community in the area of nuclear waste host, thermal barrier coatings, solid oxide fuel cell, catalyst, magnetism, luminescence etc. Such application arises due to their unique properties such as wide band gap, high radiation stability, low thermal conductivity, high dialectic constant. The fact it also has high structural ability, low phono energy and ability to accommodate dopant ion at both A- site and B-site; they are considered excellent host for inorganic phosphors. Here research work is directed towards synthesizing optical materials having high quantum efficiency for down-conversion (DC) and up-conversion (UC). Molten salt synthesis because of its several benefits such as low temperature synthesis, friendly environmental process, and low cost are expected to produce high quality cost effective, pyrochlore nanoparticles with A2B2O7 which is expected to show high quantum yield due to unique f-f transition of lanthanide ion and host to lanthanide energy transfer.We believe by suitable tuning of dopant ion its concentration, annealing time, annealing temperature, we will be able to produce small size luminescent nanoparticles of A2B2O7 for upconversion and downconversion suitable by bio imaging and solid state lighting

Exploring organizational attitudes and preferences toward forest carbon offset : a case study of the spanish carbon footprint registry

Ovando Pol, Paola Beatriz (codirectora)Organizaciones y gobiernos de todo el mundo se comprometen cada vez más a reducir las emisiones de gases de efecto invernadero en línea con los objetivos de descarbonización pactados en el Acuerdo de París. El carbono forestal representa una vía prometedora para alcanzar estos objetivos de reducción de emisiones. Este estudio examina las actitudes y preferencias de las organizaciones hacia los proyectos de compensación de carbono forestal dentro del Registro Español de Huella de Carbono. Aplicamos la Teoría del Comportamiento Planificado (TPB) y un Experimento de Elección Dicotómica, exploramos los factores psicológicos y económicos que influyen en las decisiones voluntarias de compensación de carbono entre 249 organizaciones españolas. La encuesta evalúa las actitudes, las normas subjetivas y el control conductual percibido a través de TPB; y las preferencias por los atributos del proyecto de compensación de carbono forestal utilizando un experimento de Mejor-Peor Opción. Los resultados indican que las organizaciones están influenciadas por la opinión percibida de clientes inversores y otras empresas del sector, así como preferencias en proyectos nacionales con especies nativas.Organizations and national governments worldwide are increasingly committing to reduce greenhouse gas emissions in line with the provisions outlined in the Paris Agreement. Forest carbon represent a promising pathway to achieve these emission reduction goals, in particular in the pursuit of net zero objectives. This study examines organizational attitudes and preferences toward forest carbon offset projects within the Spanish Carbon Footprint Registry. Using the Theory of Planned Behaviour (TPB) and a Dichotomous Choice Experiment, we explore the psychological and economic factors influencing voluntary carbon offset decisions among 249 Spanish organizations. The survey assesses attitudes, subjective norms, and perceived behavioural control through TPB, and evaluates preferences for forest carbon offset project attributes using a Best- Worst Choice experiment. Results indicate that organizations offsetting actions are mainly influences by clients, investors and other organization actions, as well as a strong preference for national projects with native species.Máster Universitario en Análisis Económico Aplicado (M210

Parental feeding practices and child weight status in Mexican American families: a longitudinal analysis

Parental feeding practices are thought to influence children\u27s weight status, through children\u27s eating behavior and nutritional intake. However, because most studies have been cross-sectional, the direction of influence is unclear. Moreover, although obesity rates are high among Latino children, few studies of parental feeding practices have focused on this population. This 2-year longitudinal study examined mutual influences over time between parental feeding practices and children\u27s weight status, in Mexican American families with children 18 years old at baseline. Mothers (n = 322) and fathers (n = 182) reported on their feeding practices at baseline, 1-year follow-up, and 2-year follow-up. Weight status, defined by waist-height ratio (WHtR) and body mass index (BMI), was ascertained at all assessments. Cross-lagged panel models were used to examine the mutual influences of parental feeding practices and child weight status over time, controlling for covariates. Both mothers\u27 and fathers\u27 restriction of food predicted higher subsequent child weight status at Year 1, and for fathers this effect was also found at Year 2. Mothers\u27 and fathers\u27 pressure to eat predicted lower weight status among boys, but not girls, at Year 1. Child weight status also predicted some parental feeding practices: boys\u27 heavier weight predicted mothers\u27 less pressure to eat at Year 1, less use of food to control behavior at Year 2, and greater restriction at Year 2; and girls\u27 heavier weight at Year 1 predicted fathers\u27 less pressure to eat and less positive involvement in child eating at Year 2. This study provides longitudinal evidence that some parental feeding practices influence Mexican American children\u27s weight status, and that children\u27s weight status also influences some parental feeding practices. Feeding practices of both mothers and fathers were related to children\u27s weight status, underscoring the importance of including fathers in research on parental feeding practices and child obesity