Studies that require environmental measurements often struggle with the cost of monitoring equipment. Costs will increase as more variables are required. Thus, scientists have been increasingly relying on Arduino systems to overcome such a challenge. This paper aims to review the literature on the use of Arduino as a viable measurement tool in indoor comfort research. For this purpose, the results from three databases were compared: Web of Science, Scopus and ScienceDirect. Results from the Scopus search were then analyzed using VOSViewer according to three questions: (1) what is the state of the art and trends using Arduino; (2) how is Arduino being used in indoor environments; and (3) which are the main authors using the system and what are the most cited Arduino-related sources. The maps showed that the system is very versatile and offers the opportunity to strengthen multidisciplinary approaches.

O objetivo deste estudo é avaliar o desempenho térmico de um sistema de aquecimento e resfriamento passivo com baixo consumo de energia, composto por um módulo de aquecimento e resfriamento radiante capacitivo, o qual é alimentado por um coletor solar/radiador noturno. São apresentados os resultados preliminares de uma avaliação experimental do sistema, realizado com células-teste em Curitiba, PR. São analisadas as temperaturas características, o potencial de resfriamento médio do sistema e sua capacidade de reduzir a demanda por resfriamento no verão. O potencial de resfriamento radiante noturno da localidade é representado pela depressão da temperatura do céu (ou seja, a diferença entre a temperatura ambiente e a temperatura do céu). A capacidade de resfriamento do sistema foi confirmada, atingindo-se valores médios de até 220 Wh/m2.dia. O sistema foi capaz de reduzir o sobreaquecimento em até 97% do tempo, com um consumo de energia muito baixo.

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This work experimentally evaluates the friction shear behavior of Electric Arc Furnace (EAF) concrete, compared to its reference counterpart made with natural aggregates only. For this scope, two concrete mixes were casted, both containing a blended cement with 30% of fly ash to improve their sustainability. For each mix, other than analyzing the main mechanical properties (compressive, tensile strength and elastic modulus), push-off specimens were tested to obtain the shear strength, failure modes, stress-slip and stress-crack opening curves. The results obtained here clearly identify an enhancement of the shear strength τ of EAF concrete compared to the reference, even though the relation between τ and concrete tensile strength fct is similar between the two concretes. Results are also compared with ones in literature, dealing with ordinary and recycled aggregate concrete (RAC). Further, existing models from both designing codes and literature were applied to the experimental results, obtaining conservative predictions in all cases. The safety margin for the EAF concrete was found to be higher than for the reference concrete.

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