Thermoelectric generators for long duration lunar missions

The number of lunar missions involving the deployment of probes, rovers and other equipment is expected to raise significantly. Some of these missions will face the challenge to survive the night on the Moon, with very low temperatures on the surface. Solar thermal energy can be stored during the day and transformed into electricity at night. We present a study of the performance of thermoelectric modules. Some of the modules are used in simulations of a thermal energy storage system, which includes the test of different materials as a thermal mass. The power generated in all the cases is obtained.Peer ReviewedPostprint (published version

Analysis of the characteristic lengths in the bubble and slug flow regimes generated in a capillary T-junction

We present an analysis of the geometry of the continuous and disperse phases in the bubble and slug flow regimes in air–water mixtures generated in a capillary T-junction of 1 mm internal diameter. Bubble size dispersion is very low in the considered flow patterns. The concept of unit cell is used to identify two characteristic lengths of the two-phase flow, namely, the unit cell length and the bubble length. The relationship between these lengths and the gas and liquid superficial velocities, gas mean velocity, bubble generation frequency and volume average void fraction is analysed. We conclude that in the considered configuration the unit cell and bubble lengths can be predicted either by the ratio of the gas–liquid superficial velocities or the volume average void fraction.Peer ReviewedPreprin

ESA/ELGRA gravity-related research summer school

Peer ReviewedPostprint (published version

Modelling and Simulation of the Primary Power Distribution of a Lunar Habitat

A MATLAB/Simulink model of the Primary Power Distribution System of a lunar habitat is presented. The model can be adapted to multiple scenarios, and is able to interface with computer models of other habitat subsystems. A constant supply of power is considered regardless of the source and the time of the day, regulating the bus voltage when required. The electrical system of the International Space Station is used for reference and validation. The model has been tested in two scenarios representing two locations on the surface of the Moon.Peer ReviewedPostprint (published version

Role Playing as a Strategy in Teaching - Learning English for the Development of Speaking Skills in High School Students

Contiene gráficos anexosAunque desde el enfoque comunicativo el role playing como estrategia para el desarrollo de habilidades orales en los estudiantes de idiomas ya se ha propuesto, ya que les permite practicar la comunicación en diferentes contextos sociales mediante la interpretación de roles, esta técnica no ha sido ampliamente utilizada por los profesores de secundaria en sus clases de idiomas, relegándola a una actividad secundaria a ser usada cuando la clase se vuelve monótona o simplemente para explorar algunas de las expresiones orales de los estudiantes. Una de las causas de esta situación es que muchos profesores no conocen las directrices específicas que permitan su aplicación concreta y efectiva. El presente documento tiene como objetivo identificar las principales características y lineamientos de la técnica de role playing en el desarrollo de las habilidades de habla inglesa en los estudiantes de secundaria. A través de una revisión de la literatura propuesta por diferentes autores, esta monografía tiene como objetivo reconocer las características del role playing como estrategia de enseñanza-aprendizaje y analizar su relación con el desarrollo de las habilidades de habla inglesa. Este documento también busca compilar algunos ejemplos de actividades de role playing para el desarrollo de las habilidades orales en inglés que sirvan como referencia a aquellos profesores de secundaria que quieran implementarla de manera concreta y efectiva en su aula de idiomas.Student, Ricardo G., Role playing as strategy for development of speaking skills in high school students. Licenciatura en inglés como Lengua Extranjera, November, 2020, Universidad Nacional Abierta y a Distancia. Although from the communicative approach role playing technique as a useful strategy for the development of speaking skills in language students has been proposed since it allows them to practice communication in different social contexts by playing different roles, this technique has not been widely used by secondary school teachers in their language classrooms, relegating it as a secondary activity to be used when the class becomes monotonous or simply to explore some of the students' oral expressions. One of the causes of this situation is that many teachers are unaware of the specific guidelines that allow for its concrete and effective application. This document aims to identify the main characteristics and guidelines of role playing in the development of English-speaking skills in high school students. Through a review of the literature by different authors, this monograph aims to recognize the characteristics of role playing as a teaching-learning strategy and to analyze its relationship with the development of English-speaking skills. Finally, this paper aims to collect some samples of role-playing activities for the development of English oral skills that serve as a reference for the secondary school teachers who want to implement this technique in a concrete and effective way in their language classroom