Um procedimento analítico limpo baseado em extração em ponto nuvem é descrito para a determinação de cobre e ferro em materiais vegetais. Após a digestão da amostra em frascos fechados em forno de microondas, empregando mistura oxidante diluída (HNO 3 + H 2 O 2 ), os íons metálicos foram simultaneamente extraídos como complexos hidrofóbicos formados com 1,2-tiazolilazo-2-naftol (TAN) usando Tri...

David Cabrero Souto Dpto. Computación Universidad de A Coruña Campus de Elviña s/n 15071 A Coruña, Spain [email protected] Jesús Vilares Ferro Area de Ciencias de la Computación e Inteligencia Artificial Universidad de Vigo Edificio Politécnico 32004 Ourense, Spain [email protected] Manuel Vilares Ferro Dpto. Computación Universidad de A Coruña Campus de Elviña s/n 15071 A Coruña, Spain vilares@ud...

We present results of ac susceptibility measurements highlighting the presence of thermal hysteresis and phase coexistence across the ferro-to antiferromag-netic transition in various CeFe 2 based pseudobinary systems. These results indicate that the ferro-to antiferromagnetic transition in these systems is first order in nature.

David Cabrero Souto Dpto. Computación Universidad de A Coruña Campus de Elviña s/n 15071 A Coruña, Spain [email protected] Jesús Vilares Ferro Area de Ciencias de la Computación e Inteligencia Artificial Universidad de Vigo Edificio Politécnico 32004 Ourense, Spain [email protected] Manuel Vilares Ferro Dpto. Computación Universidad de A Coruña Campus de Elviña s/n 15071 A Coruña, Spain vilares@ud...

The previous studies have shown that (a) noncovalent interactions of the ferro-heme fragment of residues 1-38 and apoprotein (1-104) of horse cytochrome c simultaneously and specifically form two isomeric complexes, types I and II resembling the native protein (the redundant residues flexibly protruding from the ordered structure); (b) the type II form but not type I appears to bind to CO; and ...

A nearby supernova (SN) explosion in the past can be confirmed by the detection of radioisotopes on Earth that were produced and ejected by the SN. We have now measured a well resolved time profile of the 60Fe concentration in a deep-sea ferromanganese crust and found a highly significant increase 2.8 Myr ago. The amount of 60Fe is compatible with the deposition of ejecta from a SN at a distanc...

In this work, the effect of a variable spatial magnetic field on ferro-nanofluid flow and heat transfer in a double-sided lid-driven enclosure with a sinusoidal hot wall is investigated. The working fluid is a mixture of iron oxide (Fe3O4) nanoparticles and water and is referred to as a ferro-nanofluid. The control volume-based finite element method (CVFEM) is used to solve the governing equati...

The objective of this work is to predict the temperature of the different types of walls which are Ferro cement wall, reinforced cement concrete (RCC) wall and two types of cavity walls (combined RCC with Ferrocement and combined two Ferro cement walls) with the help of mathematical modeling. The property of low thermal transmission of small air gap between the constituents of combine materials...