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A handcrafted, low cost sustainable electrochemical sensor based on graphite/PLA was developed and applied for the simultaneous quantification of Pb2+ and Cd2+ in jewelry.

experiência do usuário, tele-presença, interação humano-computador, multicanais Muitas cidades e países do mundo iniciaram quarentena e lockdowns na tentativa de diminuir o contágio do Covid-19, configurando assim, o fim do século 20: o século da tecnologia. O crescimento rápido das possibilidades tecnológicas e comunicação avança a interação humano-computador conectando usuários a diversos computadores em um ecossistema dinâmico criando experiências pervasivas. O novo desafio social, resultado da quarentena e autopreservação, levam isolamento, tecnologia, internet, família, educação, trabalho e comunicação a trazer novos significados para objetos e interações. Cada geração tem suas próprias perspectivas e modelos mentais sobre a pandemia e uso de tecnologia, criando para si as pontes necessárias entre canais a fim de facilitar suas próprias jornadas de experiências em alcançar objetivos. Essa pesquisa foca no entendimento de como a quarentena e isolamento social afetaram o senso de espaço e isolamento das pessoas, influenciando comunicação, entretenimento, trabalho e educação. A pesquisa foi conduzida durante o decreto de quarente oficial na cidade do Rio de Janeiro-de 16 de março à 1 de junho. user experience, telepresence, human-computer interaction, multi-channel Many cities and countries around the world started quarantine and city lockdowns to diminish the spread of Covid-19, configuring the end of the 20th century: the century of technology. The fast growing technology and communication possibilities upgrade human-computer interactions to connecting users to many computers in a dynamic ecosystem in pervasive experiences. The new social challenge, from quarantine and self-preservation, takes home isolation, technology, Internet, family, education, work and communication to surface new sense of things and interactions. Each generation has their own perspectives and mental models about the pandemic times and the use of technology, creating themselves the necessary bridges between channels to make their experience journeys easier and to reach objectives. This research focus on understanding how quarantine and social isolation in Rio de Janeiro affected the 4 generations' interaction with digital devices and he diversity of channels, how it affected their own sense of space and isolation, influencing communication, entertainment, work and learning. The research was conducted during the quarantine official decree in the city of Rio de Janeiro-from March 16th to June 1st.

We perform an experimental analysis on five branch and bound based algorithms for the Maximum Clique problem. The goal is to evaluate the effectiveness of a certain heuristic for the bounding function. The analysis is done through the usual statistical hypothesis testing framework. The method shows itself powerful in discriminating the cases where the heuristic is effective and those where it is not.