Estudo comparativo entre uma pastagem nativa e o capim pangola (Digitaria decumbens) visando a produção de leite.

Produção de leite através de um criatorio em regime de campo na zona da mata de Pernambuco.Resumo

Estudos sobre nível proteíco e uréia na alimentação de vacas mestiças em produção.

Estudos sobre nivel proteina e ureia na alimentacao de vacas mesticas em producao

Comparison of Howland and General Impedance Converter (GIC) circuit based current sources for bio-impedance measurements

The current source is a key component in bio-impedance measurement systems. The accuracy of the current source can be measured in terms of its output impedance together with other parameters, with certain applications demanding extremely high output impedance. This paper presents an investigation and comparison of different current source designs based on the Enhanced Howland circuit combined with a General Impedance Converter (GIC) circuit using both ideal and non-ideal operational amplifiers. Under differing load conditions two different settings of the GIC are evaluated and the results are compared to show its performance settings. Whilst the study has shown that over a wide bandwidth (i.e. 100Hz-100MHz) the output impedance is limited, operation over a more limited range offers output impedance in the Giga-ohm range, which can be considered as being infinite

Diagnóstico agroambiental do Município de Jatobá, Estado de Pernambuco.

bitstream/CNPS/11863/1/circtec20_2003_jatoba.pd