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Complete characterization of ultrasound transducers through the "Field II" simulation program

100%

Guidi G. , Flateri S.

Archives of Acoustics

1999

tom Vol. 24, no. 3

255-268

Acoustic field characterization is usually limited to the measurement of the field amplitude, and employs well-known investigation methods. However, it is known that in many applications an important role is played by the phase field distribution. For example, a complete acoustic field characterization (i.e. the determination of both the amplitude and phase field distributions), results very useful for the correct interpretation of the Doppler signals detected by such a transducer. In this paper a technique for the measurement of the complex field (phasor) produced by single element transducers is presented. It is based on the time domain analysis of the RF pressure signals produced in front of the transducer. The technique, proposed as a general experimental procedure for the concurrent measurement of phase and amplitude fields, is here applied to fields synthesized with the "Field II" simulation program. Simulation results are compared with field distributions both available in the literature in analytic form, or derived experimentally.

Beneficial effects of natural products: new candidates for feed additives

70%

Longo V. , Russo R. , Guidi G. , Morena G. , Pucci L.

tom 70

nr 09

In recent years, the need for food safety and animal welfare has stimulated the search for new feeding strategies based on the use of natural feed additives, capable of ensuring the health of animals and excellence in their production performance. This study evaluates the phytochemical composition, antioxidant activity, and anti-hemolytic effects of a new product, Lisosan Reduction, containing the grain lysate Lisosan G and extracts of Picrorhiza and Desmodium. The data obtained were compared with those related to Lisosan G alone. Phytochemical compounds are present in high quantities in both products. The flavonoids, in particular, are doubled in Lisosan Reduction compared to Lisosan G. Lisosan Reduction also showed a greater antioxidant capacity, determined by the ORAC test, compared to Lisosan G. The antioxidant activity of Lisosan G and Lisosan Reduction was also evaluated in an ex-vivo system of human and dog erythrocytes (CAA-RBC). The results of this test show a higher antioxidant effect of the mixture Lisosan Reduction, compared to the lysate alone, both in human and canine samples, with greater effectiveness in human erythrocytes. The anti-hemolytic effects of Lisosan G and Lisosan Reduction were also evaluated, and the results show a stronger effect of Lisosan Reduction, compared with Lisosan G, in both human and dog samples. The results of our study demonstrate that Lisosan G and, in particular, Lisosan Reduction contain several bioactive compounds and have a strong antioxidant activity, suggesting the use of these compounds as feed additives to improve animal health.