9 research outputs found
INVESTIGATION OF THE SHIFTING-PARAMETER AS A FUNCTION OF PARTICLE SIZE DISTRIBUTION IN A FLUIDIZED BED TRAVERSING FROM A FIXED TO FLUIDIZED BED
Accurate predictions of pressure drops in fluidized beds are of great importance in the industry. Up to date no satisfactory correlation exists to predict the pressure drop in a fluidized bed as the bed is traversing from one regime to another. In the present study the powered addition correlation [1] is investigated for this particular application. It has been found that this correlation is well suited for the investigated application
EtnobotĂąnica de Leguminosae entre agricultores agroecolĂłgicos na Floresta AtlĂąntica, Araponga, Minas Gerais, Brasil
A História da Alimentação: balizas historiogråficas
Os M. pretenderam traçar um quadro da HistĂłria da Alimentação, nĂŁo como um novo ramo epistemolĂłgico da disciplina, mas como um campo em desenvolvimento de prĂĄticas e atividades especializadas, incluindo pesquisa, formação, publicaçÔes, associaçÔes, encontros acadĂȘmicos, etc. Um breve relato das condiçÔes em que tal campo se assentou faz-se preceder de um panorama dos estudos de alimentação e temas correia tos, em geral, segundo cinco abardagens Ia biolĂłgica, a econĂŽmica, a social, a cultural e a filosĂłfica!, assim como da identificação das contribuiçÔes mais relevantes da Antropologia, Arqueologia, Sociologia e Geografia. A fim de comentar a multiforme e volumosa bibliografia histĂłrica, foi ela organizada segundo critĂ©rios morfolĂłgicos. A seguir, alguns tĂłpicos importantes mereceram tratamento Ă parte: a fome, o alimento e o domĂnio religioso, as descobertas europĂ©ias e a difusĂŁo mundial de alimentos, gosto e gastronomia. O artigo se encerra com um rĂĄpido balanço crĂtico da historiografia brasileira sobre o tema
Reaction zone weakening effects under hot and diluted oxidant stream conditions
This paper reports computational results, to complement experimental observations, on the turbulence-chemistry interaction of nonpremixed jet flames issuing into a heated and highly diluted oxidant stream. It is found experimentally that large-scale vortices and flame stretch can lead to spatial thinning and a decrease in OH concentration. This reduction in OH is described as a weakening of the reaction zone. Accompanying reaction zone weakening is also an increase in H2CO levels. The reduction in reaction rates is most noticeable at low oxidant stream O2 levels. The heated and low oxygen oxidant conditions typify those of moderate or intense low oxygen dilution (MILD) combustion. The computational results indicate that the effects of the low oxygen levels of MILD combustion leads to both a reduction in reaction rates and an increase in transport of O2 across the reaction zone. The relationship between the reaction rate and level of O2 permeation suggests that a form of partial premixing can occur under MILD combustion conditions. This partial premixing leads to the formation of flame intermediates, which contribute to the stabilization of the flames. The permeation effects are most pronounced at high strain rates, which are commonly encountered in practical MILD combustors.Paul R. Medwell, Peter A. M. Kalt, and Bassam B. Dall
Plantas medicinais utilizadas na comunidade caiçara da Praia do Sono, Paraty, Rio de Janeiro, Brasil Medicinal plants used in the "caiçara" community of Praia do Sono, Paraty, Rio de Janeiro, Brazil
A comunidade caiçara da Praia do Sono ainda sustenta hĂĄbitos e tradiçÔes de antigas geraçÔes, o que foi facilitado pelo difĂcil acesso a esta praia. O presente trabalho objetiva investigar o conhecimento sobre as plantas medicinais nesta comunidade. Foram realizadas entrevistas com 12 informantes especialistas (6 homens e 6 mulheres). As 89 espĂ©cies citadas estĂŁo distribuĂdas em 43 famĂlias, sendo Lamiaceae e Asteraceae as mais representativas. As indicaçÔes terapĂȘuticas das plantas medicinais citadas foram agrupadas em 13 categorias de doenças, seguindo a CID-10, adotada pela OMS. As informaçÔes sobre as partes das plantas utilizadas, as indicaçÔes de uso e os locais de coleta foram indicados. Dez espĂ©cies apresentaram grande versatilidade quanto aos seus usos, com IR>1. Treze espĂ©cies, sendo Cecropia pachystachya Trec.; Davilla rugosa Poiret e Trema micrantha (L.) Blume nativas do bioma Mata AtlĂąntica, apresentaram valores de CUPc maior que 50%. Estes resultados servem de estĂmulo para novos trabalhos nessa ĂĄrea e para futuros estudos sobre os constituintes quĂmicos e as propriedades farmacolĂłgicas destas plantas.<br>The "caiçara' community of Praia do Sono retains some of the habits and traditions from ancient generations. This may be due to the difficulties of accessibility to that area. This paper aims to investigate the knowledge about the medicinal plants in this community. Twelve specialist informants were selected and interviewed (six men and six women). Eighty-nine species were cited, belonging to 43 botanical families. Lamiaceae and Asteraceae are the most representative ones. Therapeutic indications were decoded and grouped in 13 categories of diseases. Th is classification follows the ICD 10 adopted by WHO. Information regarding the plant tissue used, their uses and the collection sites were indicated. Ten species showed great versatility of uses, with IR>1. Of the 13 species that have CUPc values over 50%, Cecropia pachystachya Trec.; Davilla rugosa Poiret and Trema micrantha (L.) Blume are native to the Atlantic Forest. Th ese results can be used as a motivation for further studies in the area and also can provide the basis for future studies on chemical constituents and pharmacological proprieties of the plants cited