03401nam a2200421 4500 20260818090427.0 080598 th eng .b10195166 AIT Thesis no. AE-93-19 Phanida Busaparoek Determination of physical and mechanical properties as maturity indices for mango variety Nam Dokmai Bangkok : Asian Institute of Technology, 1993 88 leaves : ill. Thesis ; no. AE-93-19 Thesis (M.Eng.) - Asian Institute of Technology, 1993 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering. A testing unit for nondestructive evaluation of quality of "Nam Dokmai" mango using a mechanical exciter and piezoelectric film transducer for determination of mechanical properties, was developed. Mechanical properties, total soluble solids and physical characteristics of mango at different maturity stages from eight to fifteen weeks after fruit set, were measured. The correlations between mechanical properties, total soluble solids, physical characteristics and maturity were investigated. It was found that physical characteristics such as weight, volume, specific gravity, width, thickness and total soluble solids of mango increased with maturity. Mechanical properties using punch test such as rupture force and slope of force-deformation curve decreased with maturity. For mechanical properties using nondestructive test, shock wave propagation velocity, magnitude of maximum peak and magnitude of a 200 Hz component in the frequency spectrum increased with maturity, while attenuation coefficient decreased with maturity. The correlation between mechanical properties, total soluble solids and physical characteristics were also determined. The parameters, including shock wave propagation velocity, magnitude of maximum p·eak and magnitude of 200 Hz component have been shown to identify the maturity stage of "Nam Dokmai" mango. However magnitude of positive maximum peak was found to be the best indication of maturity. Mango Athapol Noomhorm, Chairperson Jindal, Vinod Kumar, Examination Committee Ilangantileke, S.G., Examination Committee Vincent, J.C., Examination committee Rajamangala Institute of Technology, Scholarship donor Asian Institute of Technology. Thesis ; no. AE-93-19 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B16018 .b10195166 mnait x 240329 2 951012 m a x 0 mnait mnait mnarc 20 40 Barcode : 30050003008769 CREATED : 1994-05-16 RECORD # : i10233878 LPATRON : 1016447 LCHKIN : 2002-07-12 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 2 TOT RENEW : 1 Barcode : 30050002586195 CREATED : 1994-05-16 RECORD # : i1023388x LPATRON : 1017416 LCHKIN : 2009-07-27 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 12 TOT RENEW : 5 Barcode : 30050120375810 CREATED : 2016-01-06 RECORD # : i13010645 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 28041 28041 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. AE-93-19 30050003008769 2026-08-18 09:04:27 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. AE-93-19 30050002586195 2026-08-18 09:04:27 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. AE-93-19 30050120375810 2026-08-18 09:04:27 2026-08-18 40