Table 3.
Comparison of the mean values ± standard deviation of the electrical parameter of the stored date fruits under various testing frequencies. Where Cs is capacitance value (series equivalent circuit model), Rs is equivalent series resistance, D is dissipation factor, Cp is capacitance value (parallel equivalent circuit model), Rp is equivalent parallel resistance, Lp is inductance value (parallel equivalent circuit model), Ls is inductance value (series equivalent circuit model), R is resistance, X is reactance, DCR is direct current resistance, Z is the absolute value of impedance, ϴ (rad) is phase radian, ϴ° is phase angle, and Q is the quality factor.
| Parameters | Frequency (Hz) | ||||
|---|---|---|---|---|---|
| 10 | 100 | 1000 | 10,000 | 100,000 | |
| Cs (nF) | 1916.73 ± 1926.05 A | 771.77 ± 1369.47 B | 40.89 ± 55.76 C | 2.3 ± 3.63 C | 0.3 ± 0.3 C |
| Rs (kΩ) | 687.33 ± 738.17 A | 602.25 ± 610.49 B | 542.33 ± 534.54 B | 389.32 ± 339.27 C | 91.1 ± 51.63 D |
| D | 28.55 ± 16.79 A | 20.19 ± 12.05 B | 8.86 ± 3.95 C | 3.28 ± 1.71 D | 1.19 ± 0.87 E |
| Cp (nF) | 136.15 ± 159.6 A | 31.52 ± 66.83 B | 2.97 ± 4.84 C | 1.09 ± 1.85 C | 0.7 ± 1.3 C |
| Rp (kΩ) | 646.73 ± 686.5 A | 606.4 ± 616.16 AB | 552.71 ± 551.47 B | 468.83 ± 456.8 C | 308.34 ± 264.8 D |
| Lp (H) | −1422.6 ± 1641 C | −1261.5 ± 2214 C | −725.71 ± 592.5 B | −34.98 ± 51.45 A | −29.31 ± 97.31 A |
| Ls (H) | −464.63 ± 617.51 C | −86.85 ± 123.01 B | −11.67 ± 14.8 A | −65.5 ± 209.08 B | −12.77 ± 42.96 A |
| R (kΩ) | 640.7 ± 677.13 A | 605.6 ± 613.19 AB | 547.58 ± 537.3 B | 391.56 ± 339.1 C | 94.59 ± 53.75 D |
| X (kΩ) | −110.84 ± 330.09 B | −65.09 ± 104.27 A | −103.71 ± 137.53 B | −163.82 ± 203.84 C | −130.02 ± 103.78 B |
| DCR (kΩ) | 681.48 ± 698.49 A | 689.85 ± 709.44 A | 705.66 ± 726.77 A | 708.08 ± 728.74 A | 713.14 ± 730.99 A |
| Z (kΩ) | 642.84 ± 679.61 A | 614.38 ± 619.67 AB | 554.67 ± 547.39 B | 454.89 ± 452.38 C | 164.41 ± 111.08 D |
| ϴ (rad) | −0.14 ± 0.12 B | −0.11 ± 0.08 A | −0.16 ± 0.07 B | −0.41 ± 0.18 C | −0.86 ± 0.26 D |
| ϴ° | −8.17 ± 6.75 B | −6.32 ± 4.48 A | −9.06 ± 4.26 B | −23.45 ± 10.27 C | −48.74 ± 14.74 D |
| Q | 0.16 ± 0.13 C | 0.44 ± 1.11 B | 0.17 ± 0.08 C | 0.47 ± 0.25 B | 1.27 ± 0.6 A |
The means (n = 610 for Lp parameter at 10 Hz, N = 649 for Lp parameter at 100 Hz, n = 800 for Lp at 1000, 10,000, and 100,000, n = 800 for other electrical parameters) within each column with the same letters are not significantly different at p ≤ 0.05.