Encontrados 4 documentos, a visualizar página 1 de 1
Mechanical study of PLA-PCL fibers during in vitro degradation
André Vieira; J. C. Vieira; J. M. Ferra; Magalhães, F. D.; R. M. Guedes; Marques, A.T.
Degradation and Viscoelastic Properties of PLA-PCL, PGA-PCL, PDO and PGA Fibres
A. C. Vieira; J. C. Vieira; R. M. Guedes; A. T. MarquesAliphatic polyesters, such as polylactic acid (PLA), polyglycolic acid (PGA), polycaprolactone (PCL), polydioxone (PDO) and others, have been commonly used in biodegradable products. Hydrolytic and/or enzymatic chain cleavage of these materials leads to α-hydroxyacids, which, in most cases, are ultimately assimilated in human body or in a composting environment. However, each of these has some shortcomings...
Estimativa de custo de produção de arroz irrigado e de sequeiro, safra 2004/05,...
MELO FILHO, G. A. de; RICHETTI, A.; HECKLER, J. C.; VIEIRA, C. P.Os agricultores precisam de informação sobre os custos de produção para tomarem decisão sobre quais sistemas de produção escolher. ; 2004
The solar origins of the Sun-Earth connection events on April 1999 and February...
Balmaceda,L. A.; Gonzalez,W. D.; Echer,E.; Santos,J. C.; Vieira,L. E. A.; Dal Lago,A.; Guarnieri,F. L.; Gonzalez,A. L. C.In this work we present a comparison between the solar origins of two solar-terrestrial connection events occurring on April 1999 and February 2000, respectively. On April 13 (1999), a coronal mass ejection (CME) appeared for the first time in LASCO-C2 coronagraph field of view at 03:30 UT. The possible solar disc source of this CME was located at coordinates N25 E05, and it consisted on flaring activity togeth...
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