Este trabalho teve o objetivo de avaliar a capacidade de enraizamento, em água, de brotações, ponteiros e estacas herbáceas de clones de mandioca de mesa por meio da técnica de propagação rápida. Foram realizados quatro experimentos na área experimental do CCA-UFRR, em Boa Vista, Roraima, em delineamento inteiramente casualizado. Avaliou-se a percentagem de enraizamento das partes da planta (brotações, ponteiros e estacas herbáceas) quando imersas em água de poço artesiano, filtrada e água proveniente da chuva. De acordo com os resultados obtidos pode-se concluir que o clone de mandioca de mesa Pão apresenta uma alta capacidade de enraizamento quando se utiliza o método de propagação rápida por meio de microestacas; a capacidade de enraizamento, em água, de brotações, ponteiros e estacas herbáceas de plantas de mandioca depende do fator genético e da origem da água utilizada; e a água proveniente da chuva pode ser uma excelente opção para ser utilizada para promover o enraizamento das estruturas vegetativas da mandioca no processo de propagação rápida. = This work heads to evaluate the rooting capacity, in water, of shoots, pointers and steam cuttings of cassava clones of table by the fast propagation technique. Four experiments were carried out in the CCA-UFRR experimental area, in Boa Vista, Roraima state, in a completely randomized design. The rooting percentage was evaluated in plant cuttings (shoots, pointers and cutting steams) when inside well`s water, filtrated water and rain water. The following conclusions are based on the obtained results: the table cassava clones “Pão” shows high capacity of rooting by the fast propagation technique by micro steams cuttings; the capacity of rooting, in water, of shoots, pointers and steams cutting of cassava depends on genetic factor and the kind of water used; the rain water may be an excellent option of rooting of vegetative structures of cassava in fast process of propagation.

Stainless steel AISI 316 was coated with aluminum-silicon by Chemical Vapor Deposition in Fluidized Bed Reactor (CVD-FBR) to 540°C and subsequently heat treated to improve its mechanical properties and its behavior against oxidation, by inter diffusion of the alloying elements. Later, oxidation was performed austenitic stainless steel aluminum-silicon coated at temperatures of 700 and 750°C, in an environment with 100% steam, to evaluate their performance. Mass gain graphs were made and oxide films were analyzed by SEM and X-ray diffraction to observe the morphology of the oxides. Thermodynamic simulation was carried out during oxidation in water vapor of the substrates for possible solid phases which could be formed. The form of attack at 750°C is similar to 700°C, although the rate of oxidation is increased, because the diffusion of the alloying elements and the oxidation reactions are faster. These coatings have good resistance to oxidation in water vapor and forming an alumina surface layer which protects the substrate from corrosion attack.