Results 21 to 30 of about 2,820 (212)

Wood density and microfibril angle from pith to bark of a sugi cultivar (Cryptomeria japonica, Japanese cedar, Tosaaka) grown in a Nelder plot

Journal of Wood Science, 2022
The current stumpage price in harvesting of a 50-year-old sugi (Japanese cedar, Cryptomeria japonica) plantation is not enough to motivate forest owners to reforest. Therefore, it is vital to reduce the cost for reforestation after logging as well as for
Yoshio Kijidani, Taku Tsuyama, Hisato Oda, Ryoko Hirata, Satoshi Ito   +4 more
doaj   +1 more source

Small Angle Neutron Scattering Reveals Wood Nanostructural Features in Decay Resistant Chemically Modified Wood

Frontiers in Forests and Global Change, 2022
While it is known that modifying the hydroxyls in wood can improve the decay resistance; what is often missing in the literature is whether these modifications alter wood nanostructure, and how these changes correlate to the improved decay resistance ...
Rebecca E. Ibach, Nayomi Z. Plaza, Sai Venkatesh Pingali   +2 more
doaj   +1 more source

An Overview of Microfibril Angle in Fiber of Tension Wood [PDF]

European Journal of Biophysics, 2014
The angle between helical windings of microfibrils in the secondary cell wall of fibers and the long axis is called microfibril angle (MFA). Stiffness of wood depends on variations in the MFA. The large MFA shows low stiffness, which is found in juvenile wood and this character make threes vulnerable to high winds breaking.
openaire   +1 more source

The Influence of Microfibril Angle on the Wood Stiffness Parameters

Procedia Engineering, 2017
Abstract The cellulose microfibrile angles /MFA/ in tracheids of spruce wood were observed using the polarization microscope treatment. For the wood samples tested, the modulus of elasticity in compression strain was performed. The close dependency of the MFA values on to the parameters of modulus of elasticity was established.
Jan Vaněrek, Radomír Martinek, Pavel Čada, Pavel Kuklík   +3 more
openaire   +1 more source

The influence of the microfibril angle on wood stiffness: a continuum micromechanics approach

Computer Assisted Methods in Engineering and Science, 2022
Wood exhibits an intrinsic structural hierarchy. It is composed of wood cells, which are hollow tubes oriented in the stem direction. The cell wall is built up by stiff cellulose fibrils which are embedded in a soft polymer matrix.
Karin Hofstetter, Christian Hellmich, Josef Eberhardsteiner   +2 more
doaj  

Fiber Characteristics and Mechanical Properties of Oxytenanthera abyssinica

Plants, 2023
Unlike the culm hollow structure of most bamboo species, Oxytenanthera abyssinica has a unique solid or semi-solid culm, which may endow it with superior mechanical performance.
Linpeng Yu, Fukuan Dai, Kangjian Zhang, Zehui Jiang, Mingsong Xia, Youhong Wang, Genlin Tian   +6 more
doaj   +1 more source

X-Ray Diffraction Methods for Microfibril Angle Measurement in Maize and Sorghum Stalks

Agronomy
Stalk lodging (the structural failure of plant stems prior to harvest) remains a major constraint to global cereal crop production, reducing yields, impairing grain quality, and increasing harvest losses. Since cellulose microfibrils are the primary load-
Yusuf A. Oduntan, Daniel J. Robertson
doaj   +1 more source

Transcriptome profiling of Pinus radiata juvenile wood with contrasting stiffness identifies putative candidate genes involved in microfibril orientation and cell wall mechanics

BMC Genomics, 2011
Background The mechanical properties of wood are largely determined by the orientation of cellulose microfibrils in secondary cell walls. Several genes and their allelic variants have previously been found to affect microfibril angle (MFA) and wood ...
Wu Harry X, Li Xinguo, Southerton Simon G   +2 more
doaj   +1 more source

Study on the Variation Pattern and Influencing Factors of Poisson’s Ratio of Bamboo

Frontiers in Materials, 2022
As a natural polymer material, bamboo is regarded as a super material with lightweight but excellent mechanical properties. With the increasing application of bamboo in structures, high-strength composite materials, bridges, musical instruments, and ...
Haojie Lu, Hongyang Lian, Jiayu Xu, Niuniu Ma, Zhezhe Zhou, Yuanpu Song, Youming Yu, Youming Yu, Xiaochun Zhang, Xiaochun Zhang   +9 more
doaj   +1 more source

Comparative studies on wood structure and microtensile properties between compression and opposite wood fibers of Chinese fir plantation

Journal of Wood Science, 2021
The microtensile properties of mechanically isolated compression wood (CW) and opposite wood (OW) tracheids of Chinese fir (Cunninghamia lanceolata) were investigated and discussed with respect to their structure. Major differences in the tensile modulus
Zhu Li, Tianyi Zhan, Michaela Eder, Jiali Jiang, Jianxiong Lyu, Jinzhen Cao   +5 more
doaj   +1 more source