The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Ignacio Nevares - One of the best experts on this subject based on the ideXlab platform.
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Method to estimate the medullar rays angle in pieces of wood based on tree-Ring Structure: application to planks of Quercus petraea
Wood Science and Technology, 2018Co-Authors: Víctor Martínez-martínez, María Alamo-sanza, María Menéndez-miguélez, Ignacio NevaresAbstract:Estimating wood parameters employing non-destructive methods has been widely studied in recent years. The choice of wood used to build wine ageing barrels (cooperage) is strongly influenced by wood anatomy and specifically by the orientation of medullar rays among other aspects. In this article, a method based on the regularities of the tree-Ring Structure to estimate the medullar ray angle of the cross section of a piece of wood is proposed. This angle shows the direction of the best linear path to evaluate several tree-Ring features and could be employed to automate tasks, such as introducing an analysis path or rotating the image prior to the analysis, which some dendro analysis methods require. A dataset of 26,992 synthetic images and 110 real oak wood images was used to validate the approach. The medullar ray angle of each image considered was measured manually and estimated using the method proposed here, which employs the fast Fourier transform (FFT) to take advantage of the tree-Ring Structure regularities and find the direction angle of the best linear path to evaluate several tree-Ring features. The results obtained demonstrate a mean squared error of 0.29° and 8.19° and a mean absolute error of 0.19° and a 5.91° for the synthetic and oak wood images, respectively. These data suggest the suitability of the proposed method as part of an automated system to inspect and analyse the growth Rings in oak wood planks.
Meriem Fournier - One of the best experts on this subject based on the ideXlab platform.
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kinetics of tracheid development explain conifer tree Ring Structure
New Phytologist, 2014Co-Authors: Henri E Cuny, Cyrille B K Rathgeber, David Frank, Patrick Fonti, Meriem FournierAbstract:Summary � Conifer tree Rings are generally composed of large, thin-walled cells of light earlywood followed by narrow, thick-walled cells of dense latewood. Yet, how wood formation processes and the associated kinetics create this typical pattern remains poorly understood. � We monitored tree-Ring formation weekly over 3 yr in 45 trees of three conifer species in France. Data were used to model cell development kinetics, and to attribute the relative importanceofthedurationandrateofcellenlargementandcellwalldepositionontree-RingStructure. � Cell enlargement duration contributed to 75% of changes in cell diameter along the tree Rings. Remarkably, the amount of wall material per cell was quite constant along the Rings. Consequently, and in contrast with widespread belief, changes in cell wall thickness were not principally attributed to the duration and rate of wall deposition (33%), but rather to the changes in cell size (67%). Cell enlargement duration, as the main driver of cell size and wall thickness, contributed to 56% of wood density variation along the Rings. � This mechanistic framework now forms the basis for unraveling how environmental stresses trigger deviations (e.g. false Rings) from the normal tree-Ring Structure.
Víctor Martínez-martínez - One of the best experts on this subject based on the ideXlab platform.
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Method to estimate the medullar rays angle in pieces of wood based on tree-Ring Structure: application to planks of Quercus petraea
Wood Science and Technology, 2018Co-Authors: Víctor Martínez-martínez, María Alamo-sanza, María Menéndez-miguélez, Ignacio NevaresAbstract:Estimating wood parameters employing non-destructive methods has been widely studied in recent years. The choice of wood used to build wine ageing barrels (cooperage) is strongly influenced by wood anatomy and specifically by the orientation of medullar rays among other aspects. In this article, a method based on the regularities of the tree-Ring Structure to estimate the medullar ray angle of the cross section of a piece of wood is proposed. This angle shows the direction of the best linear path to evaluate several tree-Ring features and could be employed to automate tasks, such as introducing an analysis path or rotating the image prior to the analysis, which some dendro analysis methods require. A dataset of 26,992 synthetic images and 110 real oak wood images was used to validate the approach. The medullar ray angle of each image considered was measured manually and estimated using the method proposed here, which employs the fast Fourier transform (FFT) to take advantage of the tree-Ring Structure regularities and find the direction angle of the best linear path to evaluate several tree-Ring features. The results obtained demonstrate a mean squared error of 0.29° and 8.19° and a mean absolute error of 0.19° and a 5.91° for the synthetic and oak wood images, respectively. These data suggest the suitability of the proposed method as part of an automated system to inspect and analyse the growth Rings in oak wood planks.
Ryszard Mazurek - One of the best experts on this subject based on the ideXlab platform.
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On semigroups admitting Ring Structure
Semigroup Forum, 2011Co-Authors: Ryszard MazurekAbstract:A right-chain semigroup is a semigroup whose right ideals are totally ordered by set inclusion. The main result of this paper says that if S is a right-chain semigroup admitting a Ring Structure, then either S is a null semigroup with two elements or sS=S for some s∈S. Using this we give an elementary proof of Oman’s characterization of semigroups admitting a Ring Structure whose subsemigroups (containing zero) form a chain. We also apply this result, along with two other results proved in this paper, to show that no nontrivial multiplicative bounded interval semigroup on the real line ℝ admits a Ring Structure, obtaining the main results of Kemprasit et al. (ScienceAsia 36: 85–88, 2010).
Henri E Cuny - One of the best experts on this subject based on the ideXlab platform.
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kinetics of tracheid development explain conifer tree Ring Structure
New Phytologist, 2014Co-Authors: Henri E Cuny, Cyrille B K Rathgeber, David Frank, Patrick Fonti, Meriem FournierAbstract:Summary � Conifer tree Rings are generally composed of large, thin-walled cells of light earlywood followed by narrow, thick-walled cells of dense latewood. Yet, how wood formation processes and the associated kinetics create this typical pattern remains poorly understood. � We monitored tree-Ring formation weekly over 3 yr in 45 trees of three conifer species in France. Data were used to model cell development kinetics, and to attribute the relative importanceofthedurationandrateofcellenlargementandcellwalldepositionontree-RingStructure. � Cell enlargement duration contributed to 75% of changes in cell diameter along the tree Rings. Remarkably, the amount of wall material per cell was quite constant along the Rings. Consequently, and in contrast with widespread belief, changes in cell wall thickness were not principally attributed to the duration and rate of wall deposition (33%), but rather to the changes in cell size (67%). Cell enlargement duration, as the main driver of cell size and wall thickness, contributed to 56% of wood density variation along the Rings. � This mechanistic framework now forms the basis for unraveling how environmental stresses trigger deviations (e.g. false Rings) from the normal tree-Ring Structure.
