Thermal decomposition of coffee husks was investigated by thermogravimetric analyses. The proximate, ultimate and composition analyses were performed. Thermogravimetric tests were realized, the material was heated to 1173 K using five heating rates: 5, 10, 15, 20, 25 K min-1. The kinetic parameters were estimated using the methods of Kissinger-Akahira-Sunose and Friedman, the distributed activation energy model and the independent parallel reactions model. The isoconversional models of Kissinger-Akahira-Sunose and Friedman showed the dependence between determined values of activation energy and mass conversion, the activation energy values varied from 1437.39 to 199.22 kJ mol-1 for Kissinger-Akahira-Sunose and from 127.81 to 230.35 kJ mol-1 for Friedman model. The values of activation energy were determined for Miura-Maki method; varying from 137.39 to 199.22 kJ mol-1. The model of parallel and independent reactions showed the presence of six different reactions (with activation energy values varying from 42.0 to 214.2 kJ mol-1) occurring during coffee husks pyrolysis, indicating a complex reaction. Currently, works regarding the determination of kinetic parameters for coffee husks pyrolysis are not common. The present work is the first report using the model of parallel and independent reactions to estimate kinetic parameters for pyrolysis of coffee husks, a residue widely generated worldwide.

A pesquisa qualitativa vem sendo crescentemente utilizada em marketing para desvendar os pensamentos e as motivações mais subjetivas do consumidor. Neste trabalho, após realizarmos uma breve revisão teórica do que é a pesquisa qualitativa em marketing, nosso objetivo concentrase em proporcionar e aventar as principais e mais empregadas variações dessa metodologia de pesquisa no campo do marketing, a saber: Entrevista de Profundidade, Grupos de Foco, Técnicas Projetivas, Pesquisa Observacional, ZMET (Zaltman Metaphor Elicitation Technique), Autodriving e Filmes. No tópico seguinte propomos uma tabela comparativa englobando as vantagens e desvantagens de cada variação da pesquisa qualitativa aplicada em marketing. Após as considerações finais delimitamos novas possibilidades para investigações futuras que acreditamos, possam ajudar ainda mais na utilização dessa técnica por profissionais de pesquisa no contexto nacional.

The qualitative research is been increasingly used in marketing to unmask the thoughts and motivations more subjective from the consumer.After we accomplish an abbreviation theoretical-revision of what is the qualitative research in marketing, our main goal concentrate on to providing and to fanning the main and more used variations of that research methodology in marketing - In depth interview, focus group, projective techniques, observational research, ZMET (Zaltman Metaphor Elicitation Technique), autodriving and films. In the following topic we propose a comparative table including the advantages and disadvantages of each qualitative research variation applied in marketing. After the final considerations, we suggest possible applications for future investigations that can help even more the use of that technique for research professionals in the national context.