Este ensaio nasce de uma necessidade e de um desejo. A necessidade advém da consciência do pouco que se tem pesquisado sobre as fontes no nosso país, apesar de elas constituirem uma dimensão central para a compreensão do jornalismo. O desejo surge e ganha expressão não apenasda vontade de estudar e de investigar, mas igualmente de o fazer em conjunto, dando na medida do possível um mote comum a um grupo de docentes e investigadores ligados ao jornalismo, mesmo que cada um deles o possa glosar a seu modo.

Abstract:Indoor environmental conditions in classrooms, in particular temperature and indoor air quality, influence students' health, attitude and performance. In recent years several studies regarding indoor environmental quality of classrooms were published and natural ventilation proved to have great potential, particularly in southern European climate. This research aimed to evaluate indoor environmental conditions in 8 schools and to assess their improvement potential by simple natural ventilation strategies. Temperature, relative humidity and carbon dioxide concentration were measured in 32 classrooms. Ventilation performance of the classrooms was deeply characterized, first by fan pressurization measurements of the air permeability and later by tracer gas measurements of the air change rate assuming different envelope conditions. A total of 110 tracer gas measurements were made and the results validated ventilation protocols that were tested afterward. The results of the ventilation protocol implementation were encouraging and, overall, a decrease on the CO2 concentration was observed without modifying the comfort conditions. validated ventilation protocols that were tested afterward. The results of the ventilation protocol implementation were encouraging and, overall, a decrease on the CO2 concentration was observed without modifying the comfort conditions.

As the first step in investigating the possibility of using a distributed fibre optic strain sensing system to detect changes in the state of an underground mine resulting from mining activities, we constructed an underground mine monitoring system based on a Brillouin optical time domain reflectometer (BOTDR) system in the El Teniente mine and conducted a field trial. This paper describes the structure of and mining processes in the mine, outlines the underground mine monitoring system that we developed and constructed, and presents some monitoring results. We consider from the results of the half-year field trial that the system could detect the deformation in a tunnel in the underground mine ventilation level due to a stress distribution imbalance produced surrounding the undercut face and the large-scale ore extraction area. The monitoring system using the BOTDR-based distributed fibre optic strain sensing system can be regarded as promising for underground mine monitoring.

a b s t r a c tVentilation represents a significant part of heat loss in winter, leading to the need to minimize airflow. However, it is absolutely necessary to ensure indoor air quality and the safety of the users and to control the risk of condensation. Ventilation is responsible on average for 30%e40% of energy consumption in air conditioning in Western European buildings. There is great variability in air change rates (ACH [h À1 ]) from country to country and the minimum value takes into account comfort, sensory and hygrothermal criteria. In Portugal improvements have been made in the air permeability of window frames, but despite the improvements also made in installing mechanical extraction ventilation devices in kitchens and toilets, these often do not guarantee the minimum number of air change rates required.Air permeability tests were recently carried out in five flats with identical construction characteristics, in the same building, with the aim of characterizing the air permeability of buildings and components, in Portugal. These data are particularly useful for improving the design of building components (e.g., windows and roller shutter boxes) and to perform simulations with reliable data.

Training in VR can reduce risks and costs while allowing frequent and diversified experiential learning activities. We present a novel VR immersive authoring tool for experiential learning courses with industrial machinery. A trainer can create a course from scratch, defining all its components (structure, models, tools, and settings). The actions which trainees should perform can be specified by demonstration. After completing the course, trainees' actions will be matched against the trainer's.