Results 131 to 140 of about 2,011 (175)
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Clonal and Within-tree Variation in Microfibril Angle in Poplar Clones
New Forests, 2006The microfibril angle (MFA) of seven poplar clones was determined using X-ray diffraction technique. MFA was measured for every growth ring at breast height (1.3 m) for all sample trees, and at 0 (butt), 5.6, 9.6, 13.6, 17.6, 19.6 and 21.6 m for clone I-69, Nanlin-95 and Nanlin-895. A total of 900 samples (chips) were assessed.
Ye Tian, Shengzuo Fang, Fang Shengzuo
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Prediction of MOE of eucalypt wood from microfibril angle and density
European Journal of Wood and Wood Products, 2003Small clear specimens of 30×30×450 mm were prepared from plantation-grown Eucalyptus globulus, E. nitens and E. regnans that were between 15 and 31 years of age. Their modulus of elasticity (MOE) and modulus of rupture (MOR) were determined using static central-point-loading bending tests. Their microfibril angle (MFA) and density were determined using
J. L. Yang, R. Evans
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Mechanical performance and cellulose microfibrils in wood with high S2 microfibril angles
Journal of Materials Science, 2010Corewood and compression wood, both with high S2 microfibril angles, are the worst parts of the tree most in need of improvement in wood quality. This study focuses on the characteristics of cellulosic reinforcement in wood with high S2 microfibril angles lying between 35° and 60°, as well as the probable influence of these characteristics on wood ...
Ping Xu +3 more
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Variation in microfibril angle in Eucalyptus clones
Holzforschung, 2004Abstract The microfibril angle of the S2 layer in wood fibres is an ultra-microscopical feature that influences important properties affecting the utilisation of timber. However, this characteristic is as yet little studied, and this is especially true of the genus Eucalyptus.
J. T. Lima, M. C. Breese, C. M. Cahalan
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Microfibril Angle Distribution of Poplar Tension Wood
IAWA Journal, 2012Tension wood of poplar (Populus nigra) branches was studied by lightand electron microscopy. The characteristic features of tension wood such as wider growth rings, reduced vessel density and higher gross density were confirmed by our results. Based on a novel combination of transmission electron microscopy (TEM) imaging and image analysis, involving ...
Silke Lautner +2 more
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Wood microfibril angle variation after drying
Holzforschung, 2015Abstract The change of microfibril angle (MFA) in wood cell wall was assessed after drying at 60°C and 70°C to a target moisture content (MC) of 8% or 15%. Despite literature contradictions about the effect of drying on MFA, this study showed that drying increased significantly the MFA, possibly as a result of lateral deformation of ...
Vinicius Lube +3 more
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Measurement of microfibril angles in bamboo using Mueller matrix imaging
Applied Optics, 2016The microfibril angle (MFA) giving the orientation of cellulose chains in hard sclerenchymatous bamboo fibers is one of the most important parameters determining the overall strength of the bamboo culm. In this work, Mueller matrix imaging polarimetry is implemented for determining MFA measured over a transverse section of group of fibers and ...
Sayyad, Mannan +3 more
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Microfibril Angles Inside and Outside Crossfields of Norway Spruce Tracheids
Holzforschung, 2003Summary The major part of the wood cell wall consists of parallel-aligned cellulose fibrils. Locally, pits connecting adjacent cell walls disturb the fibril arrangement. The local fibril orientation around these mechanically weak points is crucial for the mechanical stability of the cell.
Lichtenegger, H. +3 more
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Semi-automatic measurement of microfibril angle on a microrobotic platform
2014 International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO), 2014This paper presents an implementation of a method to measure microfibril angle of paper fibers on a microrobotic test bench designed for testing the mechanical properties of paper fibers. The method is based on microscopic transmission ellipsometry and the components required for the measurements are integrated to the platform and the computation ...
Juha Hirvonen +3 more
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Inspection of Microfibril Angle of Sugi Wood by THz- TDS
2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2018Wood as a biological material has large differences in individual properties, and terahertz time-domain spectroscopy (THz- TDS) provide a new possibility for the wood products industry since THz exhibits high transparency to wood with big birefringence and diattenuation.
H. Wang, S. Tsuchikawa, T. Inagaki
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