@article{oai:niigata-u.repo.nii.ac.jp:00028368,
 author = {知野, 秀次 and 太田, 祐樹 and 黒坂, 俊 and 齋藤, 洋太郎 and 大塚, 伸吾 and 坂井, 優 and 二木, 明日香 and 児島, 清秀},
 issue = {2},
 journal = {新潟大学農学部研究報告, 新潟大学農学部研究報告},
 month = {Mar},
 note = {本研究は、果実硬度測定装置（KN_α-LA1）ならびに非破壊硬度測定装置（Vp-2型）でニホンナシ‘幸水’の共鳴周波数を測定した。さらに、フィルム包装が果実の共鳴周波数に及ぼす影響を調査した。非破壊硬度測定装置（Vp-2型）で計測した収穫時の果実の共鳴周波数は、それぞれ、594Hz（f_2）、893Hz（f_3）および1,128Hz（f_4）あった。f_2と果実重から算出した弾性指標Emf_2は17.3（×106）、弾性指標Emf_3は39.1（×106）および弾性指標Emf_4は62.4（×106）であった。f_2と直径から算出した弾性指標Edf_2は28.6（×106）、弾性指標Edf_3は63.7（×106）および弾性指標Edf_4は103（×106）であった。その後、共鳴周波数および弾性指標は日数の経過ともに低下した。フィルム包装した果実の共鳴周波数は無包装の果実と同様であり、フィルムは共鳴周波数の計測に影響しないことが明らかになった。さらに、各共鳴周波数から算出した弾性指標Edf_n はEmf_n と相関があり、相関係数は有意に高かった。得られた回帰式から、弾性指標Edf_n からEmf_n への換算が可能となった。, In this study, the resonance frequency of the Japanese pear 'Kosui' was measured by a fruit firmness measurement device (KN_α-LA1) and a nondestructive firmness measurement device (Vp-2). The effect of polypropylene film on the measurement of the resonance frequency in the Japanese pear 'Kosui' was also determined. The frequency of second resonance (f_2) of the fruit at harvest time measured by the fruit firmness measurement device (KN_α-LA1) was 608 Hz, the elasticity index (Edf_2) calculated from the f_2 and the fruit weight (m) was 18×106, and the elasticity index (Emf_2) calculated from the f_2 and the diameter (d) was 30.5×106.The resonance frequencies of the fruit at harvest time measured by the nondestructive firmness measurement device (Vp-2) were 594 Hz (f_2), 893 Hz (f_3; third resonance) and 1,128 Hz (f_4; fourth resonance), respectively. Elasticity indices (Emf_n) calculated from the fn and m were 17.3×106 (Emf_2), 39.1×106 (Emf_3) and 62.4 ×106 (Emf_4), respectively. Elasticity indices (Edf_n) that were calculated from the fn and d were 28.6×106 (Edf_2), 63.7×106 (Edf_3) and 103×106 (Edf_4), respectively. Resonance frequencies and elasticity indices of the fruit decreased with the increase in time after harvest. Resonance frequencies of the film-packaged fruit were similar to the non-packaged fruit, and it was clarified that the film did not influence the measurement of the resonance frequency. Elasticity indices (Edf_n) correlated with elasticity indices (Emf_n), and correlation coefficients were significantly high. Conversion from elasticity index (Edf_n) to elasticity indices (Emf_n) became possible from the obtained regression.},
 pages = {89--95},
 title = {ニホンナシ‘幸水’におけるポリプロピレンフィルムが共鳴周波数の計測に及ぼす影響},
 volume = {62},
 year = {2010}
}