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10 JAR1 V ac . 8 6 4 2 0 -2 -4 Conv. JAR2 V ac . Conv. JAR3 V ac . Conv. JAR4 V ac . Conv. Figure 24. Scattergram of MC gradient – E. marginata Table 21. MC gradient results – E. marginata Final MC gradient (%) JAR2 JAR3 Vacuum Conventional Vacuum Conventional 0.4 0.9 8.9 2.0 -0.9 0.0 1.7 0.3 0.0002 0.3 -0.6 1.5 0.7 -0.8 -1.5 0.5 0.5 < 0.0001 BA AA Average Maximum Minimum Standard deviation Significance (p) Grade quality (AS/NZS 4787 ) Basic density JAR1 Vacuu m Conventional 1.3 -1.4 4.3 0.3 -1.0 -3.0 1.2 0.6 < 0.0001 B A JAR4 Vacuum Conventional 1.0 0.9 7.7 2.8 -0.2 -0.4 1.5 0.6 0.106 D A The basic density results are displayed in Figure 25 and Table 22. Multiple pairwise comparisons produced no significant differences between basic density populations of any trial. The average basic density recorded for each trial is similar to the value recorded by the Forest Products Commission Western Australia (http://www.fpc.wa.gov.au, 2009) of 670 kg/m3 for mature native forest E. marginata. 850 JAR1 JAR2 800 750 700 650 600 550 500 JAR3 JAR4 Table 22. Initial basic density results – E. marginata Trial Average Maximum Minimum Standard deviation JAR1 671.5 765.0 590.2 41.5 Basic density (kg/m3) JAR2 663.0 800.8 565.4 39.5 JAR3 654.6 728.1 536.2 43.6 JAR4 661.8 779.9 525.8 42.3 Figure 25. Scattergram of basic density – E. marginata Evaluation of super–heated steam vacuum drying viability and development of a predictive drying model for Australian hardwood species – Final report 60 Basic density (kg/m3) MC gradient (%)PDF Image | Evaluation of super-heated steam vacuum drying
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