The influence of processing parameters (slab thickness, water flow of interstand cooling and oil flow in roll gap lubrication system) on the thickness and composition of the tertiary scale formed during hot strip rolling, was studied in a low carbon steel in factory. The scale formed on the rolled surface was characterized by scanning electron microscopy and Mössbauer spectroscopy. It was observed that the combined effect of a greater rolling oil volume applied, larger bar thickness, and smaller amount of water flow during interstand cooling reduces the tertiary scale thickness. Besides, a smaller crack density in the samples is associated with greater rolling oil volume and smaller oxide scale thickness. The principal phase of the scale formed in hot-rolled steel strips is stoichiometric magnetite, without isomorphic substitutions.
Este trabalho objetivou acompanhar o comportamento das abelhas africanizadas (Apis mellifera L.), utilizando sensores de rádio frequência – RFID em Belém, Pará, Brasil. A metodologia empregada baseou-se na fixação de rastreadores às abelhas, passando a ser observadas por ondas eletromagnéticas, por meio de um condutor de metal ou carbono que funciona com antena, trocando informações com o sistema através de seus EPCs (Eletronic Product Code). A avaliação comportamental dessas abelhas com o uso da tecnologia RFID poderá trazer informações de grande importância para um melhor entendimento da biologia comportamental do inseto e suas relações com o bioma amazônico, as quais também poderão ser utilizadas na potencialização da polinização e da produção de mel para a geração de renda aos apicultores da região da Amazônia Oriental.
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