Evaluation of learning outcomes using an educational iPhone game vs. traditional game

In this paper, we present an initial study to determine the subject preferences for educational computer games for children, in which 150 education professionals participated. From the results of this first study, we have developed an iPhone game for transmitting knowledge as part of multiculturalism, solidarity and tolerance following established learning theories, several design principles, and the objectives and competences of the Spanish law for primary education. We also report on a second study to determine whether the iPhone game has better learning outcomes than a traditional game by analyzing the participation of 84 children ranging in age from 8 to 10 years old. The frequency of playing with consoles or computer games was also taken into account in this second study, and the worldwide trend of previous studies has been corroborated. For learning outcomes, the results did not show significant differences between the two groups. However, 96% of the children indicated that they would like to play with the iPhone game again, and 90% indicated that they preferred the experience with the iPhone game over the traditional one. From these results, we can conclude that the children achieved similar knowledge improvements using both the autonomous game (iPhone game) and the custom, guided game (traditional game). This could facilitate versatility in the learning process since the learning activity could be performed at any place and time without requiring supervision. Therefore, it could be a useful tool in the learning process and help teachers to fulfill students' training needs. 2013 Elsevier Ltd. All rights reserved.This work was funded by the Spanish APRENDRA project (TIN2009-14319-C02).Furió Ferri, D.; González Gancedo, S.; Juan, M.; Seguí, I.; Rando, N. (2013). Evaluation of learning outcomes using an educational iPhone game vs. traditional game. Computers and Education. 64:1-23. https://doi.org/10.1016/j.compedu.2012.12.001S1236

Laser induced forward transfer of silver pastes for printing of fingers in c-si cells.

The main objective of this work is to adapt the Laser Induced Forward Techniques (LIFT), a well- known laser direct writing technique for material transfer, to define metallic contacts (fingers and busbars) onto c-Si cells. The silver paste (with viscosity around 30-50 kcPs) is applied over a glass substrate using a coater. The thickness of the paste can be control changing the deposit parameters. The glass with the silver paste is set at a controlled gap over the c-Si cell. A solid state pulsed laser (532 nm) is focused at the glass/silver interface producing a droplet of silver that it is transferred to the c-Si cell. A scanner is used to print lines. The process parameters (silver paste thickness, gap and laser parameters -spot size, pulse energy and overlapping of pulses) are modified and the morphology of the lines is studied using confocal microscopy. Long lines are printed and the uniformity (in thickness and height) is studied. Some examples of metallization of larger areas (up to 10 cm x 10 cm) are presented

Analysis by finite element calculations of light scattering in laser-textured AZO films for PV thin-film solar cells

In the thin-film photovoltaic industry, to achieve a high light scattering in one or more of the cell interfaces is one of the strategies that allow an enhancement of light absorption inside the cell and, therefore, a better device behavior and efficiency. Although chemical etching is the standard method to texture surfaces for that scattering improvement, laser light has shown as a new way for texturizing different materials, maintaining a good control of the final topography with a unique, clean, and quite precise process. In this work AZO films with different texture parameters are fabricated. The typical parameters used to characterize them, as the root mean square roughness or the haze factor, are discussed and, for deeper understanding of the scattering mechanisms, the light behavior in the films is simulated using a finite element method code. This method gives information about the light intensity in each point of the system, allowing the precise characterization of the scattering behavior near the film surface, and it can be used as well to calculate a simulated haze factor that can be compared with experimental measurements. A discussion of the validation of the numerical code, based in a comprehensive comparison with experimental data is included

Silicon PV module customization using laser technology for new BIPV applications

It is well known that lasers have helped to increase efficiency and to reduce production costs in the photovoltaic (PV) sector in the last two decades, appearing in most cases as the ideal tool to solve some of the critical bottlenecks of production both in thin film (TF) and crystalline silicon (c-Si) technologies. The accumulated experience in these fields has brought as a consequence the possibility of using laser technology to produce new Building Integrated Photovoltaics (BIPV) products with a high degree of customization. However, to produce efficiently these personalized products it is necessary the development of optimized laser processes able to transform standard products in customized items oriented to the BIPV market. In particular, the production of semitransparencies and/or freeform geometries in TF a-Si modules and standard c-Si modules is an application of great interest in this market. In this work we present results of customization of both TF a-Si modules and standard monocrystalline (m-Si) and policrystalline silicon (pc-Si) modules using laser ablation and laser cutting processes. A discussion about the laser processes parameterization to guarantee the functionality of the device is included. Finally some examples of final devices are presented with a full discussion of the process approach used in their fabrication

Laser functionalization of surfaces

The treatment of surfaces by physical or chemical methods is a very usual way to change their original properties. Although the most common use of a surface functionalization is for tribology aims, modifications of the topography that leads to changes in the surface roughness, its hydrophilicity or hydrophobicity, its light scattering behavior, biocompatibility or even aesthetic changes are possible. In this field, laser sources have proven to be a most versatile and useful tool, being a clean and fast way to achieve any of those objectives. In this work we show the results of functionalization by laser texturing of four different materials

The effects of the size and weight of a mobile device on an educational game

In this paper, we present an educational game for an iPhone and a Tablet PC. The main objective of the game was to reinforce children's knowledge about the water cycle. The game included different interaction forms like the touch screen and the accelerometer and combined AR mini-games with non-AR mini-games for better gameplay immersion. The main differences between the two devices were screen size and weight. A comparative study to check how these differences affect different aspects was carried out. Seventy-nine children from 8 to 10 years old participated in the study. From the results, we observed that the different characteristics (screen size and weight) of the devices did not influence the children's acquired knowledge, engagement, satisfaction, ease of use, or AR experience. There was only a statistically significant difference for the global score in which the iPhone was scored higher.We would like to highlight that the scores for the two devices and for all the questions were very high with means of over 4 (on a scale from 1 to 5). These positive results suggest that games of this kind could be appropriate educational games and that the mobile device used may not be a decisive factor. (C)2012 Elsevier Ltd. All rights reserved.This work was funded by the Spanish APRENDRA project (TIN2009-14319-C02). We would like to thank the following for their contributions: The "Escola d'Estiu" and especially Juan Cano, Miguelon Gimenez, and Javier Irimia. This work would not have been possible without their collaboration. Noemi Rando, Encarna Torres, Severino Gonzalez, M. Jose Vicent, Patricia Liminana, Tamara Aguilar, Alfonso Lopez, Yolanda Martinez, Enrique Daunis, M. Jose Martinez, and Eloy Hurtado for their help. The children's parents who signed the agreement to allow their children to participate in the study. The children who participated in the study. The ETSInf for letting us use its facilities during the testing phase.Furió Ferri, D.; González Gancedo, S.; Juan Lizandra, MC.; Seguí, I.; Costa, M. (2013). The effects of the size and weight of a mobile device on an educational game. Computers and Education. 64:24-41. https://doi.org/10.1016/j.compedu.2012.12.015S24416

Application of high intensity short pulse lasers to precision micromanufacturing

Los procesos de micromecanizado con láser representan una de las opciones más prometedoras en el ámbito de desarrollo de procesos de microfabricación en diferentes sectores estratégicos. Si bien este tipo de procesos se han utilizado exitosamente en ámbitos como el de la fabricación electrónica desde hace más de veinte años, el desarrollo de nuevas fuentes láser comerciales de excímero y de estado sólido bombeado por diodo (DPSS) ha abierto la posibilidad de abordar aplicaciones completamente novedosas en el campo de la microfluídica, fabricación de sensores y MEMs, biomedicina, etc. Sin embargo, el rápido crecimiento de determinadas áreas tecnológicas ha traído como consecuencia el desarrollo de sistema específicamente dedicados (la mayoría de ellos estrictamente 2D), generándose un importante vacío en los sistemas potencialmente utilizables en le procesado de geometrías complejas estrictamente 3D. En este trabajo se presenta la concepción, diseño y algunas aplicaciones significativas de un sistema de micromecanizado láser 3D que integra dos fuentes láser trabajando en UV (excímero y DPSS) y un sofisticado sistema de posicionamiento (con seis grados de libertad) para el procesado de piezas de geometría compleja en el rango dimensional del micrómetro

Natural Selection Fails to Optimize Mutation Rates for Long-Term Adaptation on Rugged Fitness Landscapes

The rate of mutation is central to evolution. Mutations are required for adaptation, yet most mutations with phenotypic effects are deleterious. As a consequence, the mutation rate that maximizes adaptation will be some intermediate value. Here, we used digital organisms to investigate the ability of natural selection to adjust and optimize mutation rates. We assessed the optimal mutation rate by empirically determining what mutation rate produced the highest rate of adaptation. Then, we allowed mutation rates to evolve, and we evaluated the proximity to the optimum. Although we chose conditions favorable for mutation rate optimization, the evolved rates were invariably far below the optimum across a wide range of experimental parameter settings. We hypothesized that the reason that mutation rates evolved to be suboptimal was the ruggedness of fitness landscapes. To test this hypothesis, we created a simplified landscape without any fitness valleys and found that, in such conditions, populations evolved near-optimal mutation rates. In contrast, when fitness valleys were added to this simple landscape, the ability of evolving populations to find the optimal mutation rate was lost. We conclude that rugged fitness landscapes can prevent the evolution of mutation rates that are optimal for long-term adaptation. This finding has important implications for applied evolutionary research in both biological and computational realms

Actas del V Congreso ISUF-H Costa Rica 2021: Ciudades espontáneas versus ciudades planificadas: distintos retos, distintas realidades

En el año 2021 celebramos en Costa Rica la V edición del Congreso ISUF-H, los días 1, 2 y 3 de diciembre, con la Escuela de Arquitectura de la Universidad de Costa Rica como anfitriona del evento. El congreso “Ciudades espontáneas versus ciudades planificadas: distintos retos, distintas realidades” propuso como eje central una reflexión crítica sobre los procesos de urbanización planificada y urbanización espontánea, en el cual se fomente un abordaje de las ciudades como expresión de organización social, económica, ambiental y cultural, enfatizando el carácter ideológico de la urbanización y subrayando su continua construcción como resultado de construcciones complejas. La celebración de un nuevo congreso en América Latina, permitió reforzar la tradición crítica en el abordaje de las ciudades, y reforzar también la necesidad de plantear una perspectiva latinoamericana de los estudios urbanos, y por consiguiente de una teoría urbana latinoamericana. En esta ocasión el congreso se centró en ahondar en la temática de la forma urbana, desde perspectivas transversales que involucren las amplias disciplinas que asumen como objeto de discusión las problemáticas de la ciudad contemporánea y cuestionan la dicotomía planteada entre lo espontáneo y lo planificado. Para la Escuela de Arquitectura de la Universidad de Costa Rica y su Laboratorio de Ciudad y Territorio es un honor haber podido llevar a cabo esta nueva edición del congreso de la Asociación ISUF-H como segunda sede en un país latinoamericano. Relevante para fortalecer la temática de la forma urbana en la región, reforzando alianzas y estableciendo nuevas redes que permitan compartir conocimientos a partir de las experiencias de esas diversidades urbanas. Auspiciar el debate en torno a la morfología urbana y las diferencias entre esas ciudades espontáneas y las planificadas, fue una oportunidad para reunir a expertos de las distintas latitudes hispánicas.UCR::Vicerrectoría de Docencia::Ingeniería::Facultad de Ingeniería::Escuela de Arquitectur

HIV and English drugs policy

SIGLEAvailable from British Library Document Supply Centre-DSC:DXN017831 / BLDSC - British Library Document Supply CentreGBUnited Kingdo