This evidence based practice paper describes a study about an immediate feedback system using Internet and students' own cell phones: Kahoot (getkahoot.com), also a comparison between implementing clickers and mobile participation systems is analyzed. Immediate feedback enhances students' learning. For students, it's a chance to go further by breaking misconceptions and changing learning routes. For teachers, it's a practical opportunity to feel the "temperature" of the classroom in order to decide to either review some concepts or move forward to another subject. There are many cases in literature about the use of clickers as an immediate feedback system. The clicker itself is neither a tool to directly teach concepts, nor it is meant to replace quality lesson preparation and planning. The clicker is a powerful tool to augment and enhance active learning in classroom, and most importantly, it is a mean to provide accurate situational awareness to the instructor. However, implementing this solution is usually expensive, since it costs about US$ 50 each one. Kahoot is an online classroom-response system that eliminates the need to give students handheld clickers. Through Kahoot, teachers create online quizzes or surveys and mirror the questions on a big screen or interactive whiteboard; it's also possible to embed videos. Students respond to the quiz items on any Internet-connected device, including their smartphones. During this session, participants take Kahoot quizzes as students. Participants may also create Kahoot quizzes as teachers, share their quizzes with other participants, and analyze quizzes results. It's worth to mention that the result of every quiz played over the platform can be saved for further analysis. When learners start playing, they need to enter a nickname, which allows students to stay anonymous, and their recorded scores are saved in their profile. This unique feature makes Kahoot an engaging platform. In order to present students and teachers perception about this new methodology, Kahoot system is presented in five different
This paper presents two complementary methods capable of identifying four wood species (Cedrela fissilis, Ocotea porosa, Hymenolobium petraeum, and Aspidosperma subincanum) both by their volatile organic compounds and by the presence of 10 chemical elements: Al, B, Ca, Mg, Zn, Cu, Mn, Fe, Na, and Si. The volatile compounds were detected by an electronic nose formed by an array of three different conductive polymer gas sensors. The elemental determination was made by laser-induced breakdown spectrometry (LIBS). The emissions measured were treated by principal component analysis (PCA). Leave-one-out analysis showed a rate of hits of 100%.
The rapid and reliable identification of woods is a difficult task, yet extremely necessary for the control of illegal logging or trade of protected species.
Recebido em 18/6/10; aceito em 12/10/10; publicado na web em 8/11/10In this communication we describe the application of a conductive polymer gas sensor as an air pressure sensor. The device consists of a thin doped poly(4'-hexyloxy-2,5-biphenylene ethylene) (PHBPE) film deposited on an interdigitated metallic electrode. The sensor is cheap, easy to fabricate, lasts for several months, and is suitable for measuring air pressures in the range between 100 and 700 mmHg.
Dedico esta dissertação a Deus, à minha mãe Francisca, ao meu pai Antonio, ao meu irmão Cristiano, a minha namorada Daniela e a todos os meus amigos. AGRADECIMENTOS A Deus pela vida. Ao Prof. Dr. Luiz Henrique Capparelli Mattoso pela orientação, amizade, ajuda e confiança depositados em mim. Sua dedicação ao trabalho serve de exemplo para minha formação profissional. Ao Dr. Antonio Riul Jr., meu amigo Totó, pelas discussões, sugestões, incentivo nos momentos dificeis e inesgotável paciência. Ao Renê de Oste e ao José Ferrazine pela inestimável colaboração para que este trabalho pudesse ser realizado. Ao Cláudio Barros pela ajuda nas medidas elétricas DC. Ao Rubens Bemard Filho e ao Fábio Leite pelas imagens de AFM. À Alessandra, Mercedes, Nelson e Pacato que sempre estiveram próximos e prontos a ajudar. Ao Arthur P. Azevedo e ao Clóvis I. Biscegli pelas valiosas informações sobre enologia. À Embrapa Instrumentação Agropecuária pela disponibilização completa de seus laboratórios, equipamentos, pessoal e materiais necessários ao trabalho. Ao Instituto de Física de São Carlos, IFSC-USP. Aos meus pais que não pouparam esforços para que eu chegasse até aqui. Ao Cris pela compreensão quando tive que ficar no seu quarto com o computador ligado até altas horas da madrugada. 11 À minha querida Dani pela compreensão nos momentos dificeis e por seu infinito carinho com que fui presenteado. Aos meus velhos amigos Mercival, Alex e Ricardo sempre companheiros de botequim e aventuras, não necessariamente nesta mesma ordem. À aqueles que eu esqueci, meu muito obrigado. lU SUMÁRIO LISTA DE FIGURAS LISTA DE TABELAS RESUMO ABSTRACT 1-IN"TRODUÇÃO 1 2-REVISÃO BIBLIOGRÁFICA 3 2. ABSTRACT Ultra-thin films of conducting polymers, a natural polymer and a lipid-lik.e material were deposited onto gold interdigitated rnicroelectrodes envisaging the development of sensors able to detect gases released in the fruit ripening process and also to evaluate the quality of some beverages. It was checked tOOdoping effect over a self-assembled filrn of poly(o-ethoxyalinine) (POEA) regarding to the detection of ethylene through DC measurements. The POEA doping with p-toluenesulphonic acid (TSA) leads to a non-ohrnic behaviour and to an increase in the sensitivity of the device. On the other band, HCI doping points to an ohrnic behaviour regardless to the gas with no improvement in the sensor sensitivity. AC measurements were also acquired in the assessment of the sensor, displaying a better data acquisition and a higher sensibility of the polymeric filrn to tOO gaseous species ana1ysed. The hurnidity effect was quite strong in the sensor response, as the polymeric filrn became more conducting at high hurnidity environrnents. The combination of the self-assembly and Langmuir-Blodgett techniques together with the right choice of the materiaIs (conducting polymers, a natural polymer and stearic acid) to mak.e the sensing units of an electronic tongue allowed the distinction of tastants and the appraisal of wine quality in a simple and cheaper way than t...
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