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Vacuum pump Specimen chamber Electron emission column Image processing PC Plate 12. FEI Quanta 200 3D environmental electron scanning microscope. Meshpore Meshpore (Perré, 2005b) is a powerful software package used to apply image-based meshing techniques to anisotropic and heterogeneous porous media. This application allows a comprehensive finite element mesh to be prepared from digital images and can be used to determine important morphological properties of porous media, such as average cell wall thickness and media porosity. Using a number of mathematical algorithms the application is able to automatically describe cell contours by segment chains, allowing additional chains to be added, deleted, and altered. Sample preparation For each species, we cut small heartwood samples from unseasoned, median density sample boards used for the vacuum drying trials. One sample per species was cut using a laboratory bandsaw to the approximate dimensions: 4 mm (radial) x 4 mm (tangential) x 20 mm (longitudinal). The samples were cut in half lengthwise to produce two matched samples of dimension: 4 mm x 4 mm x 10 mm. One section was used for ESEM analysis while the other section was used to determine basic density. One image was analysed per species. The ESEM samples were soaked in water at room temperature for at least 24 hours, before further processing, to soften the wood tissue prior to image surface preparation. One of the radial/tangential surfaces was prepared for ESEM imaging using a precision MICROM HM 440TM sledge/sliding microtome (Plate 13). This process provides a flat, sharply sliced surface essential for producing high quality ESEM images. We loaded samples into the ESEM specimen chamber (Plate 14), levelled and scanned at 200X 400X and 800X magnifications. Images at 800X magnification were cropped to include only the wood fibres (not ray parenchyma or vessel cells). 25 Evaluation of super–heated steam vacuum drying viability and development of a predictive drying model for Australian hardwood species – Final reportPDF Image | Evaluation of super-heated steam vacuum drying
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