不同部位籽瓜果皮电学特性分析

为探究不同部位籽瓜果皮电学特性的变化规律及其相关性，以甘肃靖远1号籽瓜为试材，利用平行极板检测法测定了不同部位籽瓜果皮的8个电学特性，分析其随频率的变化规律及相关性，建立了各电学特性随频率变化的数学模型并验证。结果表明：随着频率的增加，不同部位籽瓜果皮电学特性之间存在显著差异，G、X均呈单调递增趋势变化，Rp、Cp、Z、Q均呈单调递减趋势变化；除瓜梗部外，其他部位果皮D均呈单调递增趋势变化；瓜梗部和赤道部果皮的Z与G、Lp、X之间均呈极显著负相关（P < 0.01），与Q、Cp、Rp之间均呈极显著正相关（P < 0.01），而与D之间的相关性有显著不同。回归结果表明，随着频率的变化，瓜梗部与赤道部果皮的Z、G、Cp、Rp、X和D的值均呈Polynomial模型分布（R² > 0.83）。模型验证得出在频率163.28 ~ 8 000 kHz范围内，瓜梗部和赤道部果皮Z、Lp试验值与模型预测值的一致性较好。因此，基于平行极板检测法区分籽瓜不同部位的果皮电学特性变化规律是可行的，该结果为籽瓜果皮电学检测提供理论依据。

Analysis of electrical characteristics of seed melon pericarp in different parts

In order to investigate the variation of electrical properties of seed melon rind in different parts and their correlation, eight electrical properties of seed melon rind in different parts were measured by parallel polar plate detection method using Gansu Jingyuan No.1 seed melon as the test material, the variation of electrical properties with frequency and correlation were analyzed, and mathematical models of the variation of electrical properties with frequency were established and verified. The results showed that there were significant differences between the electrical properties of seed melon pericarp in different parts with increasing frequency, with G and X showing monotonically increasing trend, and Rp, Cp, Z and Q showing monotonically decreasing trend; except for the peduncle part, the pericarp D in other parts showed monotonically increasing trend; there were highly significant negative correlations (P < 0.01) between Z and G, Lp and X in the peduncle part and equatorial part, and between Z and Q, Cp and Rp in the peduncle part and equatorial part. The regression results showed that the values of Z, G, Cp, Rp, X and D of melon peduncle and equatorial pericarp presented a Polynomial model distribution (R² >0.83) with the change of frequency; the model validation concluded that the values of Z, G, Cp, Rp, X and D of melon peduncle, and the equatorial pericarp showed a Polynomial model distribution (R² >0.83) with the change of frequency from 163.28 to 8 000 kHz. The model validation showed that the experimental values of Z and Lp in the pedicel and equatorial parts of the fruit skin were in good agreement with the model predictions in the frequency range of 163.28 - 8 000 kHz. Therefore, it is feasible to distinguish the electrical characteristics of different parts of the seed melon pericarp based on the parallel plate detection method. This result provides a theoretical basis for the electrical detection of the seed melon pericarp.