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Artificial neural networks in variable process control: application in particleboard manufacture. Investigación Agraria: Sistemas y Recursos Forestales. 18(1): 92-100.



Abstract: Artificial neural networks are an efficient tool for modelling production control processes using data from the actual production as well as simulated or design of experiments data. In this study two artificial neural networks were combined with the control process charts and it was checked whether the data obtained by the networks were valid for variable process control in particleboard manufacture. The networks made it possible to obtain the mean and standard deviation of the internal bond strength of the particleboard within acceptable margins using known data of thickness, density, moisture content, swelling and absorption. The networks obtained met the acceptance criteria for test values from non-standard test methods, as well as the criteria for using these values in statistical process control.

 

Wood anatomical relationships within Abies spp. from the Mediterranean area: a phyletic approach. Investigación Agraria: Sistemas y Recursos Forestales. 18(2): 213-225.



Abstract: An analysis was made of the wood anatomy of seven species, one subspecies and two varieties of the genus Abies from the Mediterranean area (A. alba, A. borisii-regis, A. cephalonica, A. cilicica, A. nordmanniana, A. nordmanniana subsp. equi-trojani, A. numidica, A. pinsapo, A. pinsapo var. marocana and A. pinsapo var. tazaotana) in order to find phyletically relevant features to help clarify and complement the evolutionary patterns based on molecular studies. The wood structure within the genus was qualitatively similar, except for specific features characteristic of certain provenances. However, the wood biometry allowed the different taxa to be grouped in accordance with their anatomical similarity. A. alba, A. pinsapo, A. pinsapo var. marocana and A. pinsapo var. tazaotana possess biometric features which distinguish them from the other Mediterranean firs. Furthermore, A. numidica showed biometric features which distinguish it from the eastern firs (A. borisii-regis, A. cephalonica, A. cilicica, A. nordmanniana and A. nordmanniana subsp. equi-trojani) and place it closer to certain Iberian populations of A. pinsapo. The maximum ray height in number of cells, frequency of rays with more than 30 cells and tracheid length can be regarded as specific patterns of the Mediterranean fir phylum.

 

Wood anatomy of the genus Abies: a review. IAWA Journal. 30(3): 231-245.



Abstract: The literature on the wood anatomy of the genus Abies is reviewed and discussed, and complemented with a detailed study of 33 species, 1 subspecies and 4 varieties. In general, the species studied do not show diagnostic interspecific differences, although it is possible to establish differences between groups of species using the biometry and certain qualitative features. The marginal axial parenchyma consisting of single cells and the ray parenchyma cells with distinctly pitted horizontal walls, nodular end walls and presence of indentures are constant for the genus, although these features also occur in the other genera of the Abietoideae. The absence of ray tracheids in Abies can be used to distinguish it from Cedrus and Tsuga, and the irregularly shaped parenchymatous marginal ray cells are only shared with Cedrus. The absence of resin canals enables Abies to be distinguished from very closely related genera such as Keteleeria and Nothotsuga. The crystals in the ray cells, taxodioid cross-field pitting and the warty layer in the tracheids can be regarded as diagnostic generic features.

 

MOE prediction in Abies pinsapo Boiss. timber: application of an artificial neural network using non-destructive testing. Computer and structures. 87: 1360-1365



Abstract: Determining the modulus of elasticity of wood by applying an artificial neural network using the physical properties and non-destructive testing can be a useful method in assessments of the timber structure in old constructions. The modulus of elasticity of Abies pinsapo Boiss. timber was predicted in this study through the parameters of density, width, thickness, moisture content, ultrasonic wave propagation velocity and visual grading of the test pieces. A feedforward multilayer percepton network was designed for this purpose, achieving 88.0% success in the testing or unknown group.

 

Sorption and thermodynamic properties of buried juvenile Pinus sylvestris L. wood aged 1170±40 BP. Wood Science and Technology. 43(7-8):679-690.



Abstract: The hygroscopicity and thermodynamic properties of buried juvenile Pinus sylvestris L. wood with an age of 1170±40 BP were compared with the corresponding values of juvenile wood of the same species from recently cut trees. The 35ºC and 50ºC isotherms were plotted following the saturated salts method and subsequently fitted in accordance with the GAB model. The isotherms were then compared by means of the hysteresis coefficients. X-ray diffractograms were used to analyse the crystal structure of the cellulose. The effect of time on the buried wood caused hemicellulose degradation and a decrease in the crystallinity index and the crystallite length, resulting in an increase in the proportion of amorphous zones. Because of this, the equilibrium moisture contents of the buried wood are higher than in the recent wood, both in adsorption and desorption. In terms of the thermodynamic properties, the heat involved is greater in the buried wood than in the recent wood.

 

Esteban, L.G.

García Fernández, F.

de Palacios, P.

Conde, M.


2009

25

Esteban, L.G.

de Palacios, P.

García Fernández, F.

Martín, J.A.


2009

Esteban, L.G.

de Palacios, P.,

García Fernández, F.

Moreno, R.


2009

Esteban, L.G.

de Palacios, P.

García Fernández, F.


2009

Esteban, L.G.

de Palacios, P.

García Fernández, F.

Martín, J.A.

Génova, M.

Fernández-Golfín, J.I.


2009

24

23

22

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WOOD and PAPER

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