Miyazaki Prefectural Wood Utilization Research Center

Miyazaki-shi, Japan

Miyazaki Prefectural Wood Utilization Research Center

Miyazaki-shi, Japan
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Nakatani M.,Miyazaki Prefectural Wood Utilization Research Center | Mori T.,Kyoto University
AIJ Journal of Technology and Design | Year: 2017

An influence of edge bonding between laminae, edge gaps between laminae without edge bonding, and edge distance from LSB to egde of a lamina, on pull-out properties of LSB joint embedded into CLT parallel to the grain direction was investigated and confirmed following characteristics. 1. Edge bonding was no effect on pull-out properties. 2. Pull-out properties of LSB embedded into a gap decreased with increasing width of the gap. 3. The edge distance was no effect on pull-out properties, if it is more than 0.7 times of a top thread diameter of LSB or the gaps is below 0.5 mm.

Aratake S.,Miyazaki Prefectural Wood Utilization Research Center | Matsumoto A.,Miyazaki Prefecture Central Agriculture and Forestry Promotion Bureau | Shiiba A.,Miyazaki Prefectural Wood Utilization Research Center
WCTE 2014 - World Conference on Timber Engineering, Proceedings | Year: 2014

For the purpose of examining the performance as a structural material of flat squares without pith sawn up from sugi (Cryptomeria japonica D.Don) large diameter logs, effects of loading direction on bending performance and creep behaviour were investigated. Two flat squares without pith were sawn up from one log as specimens (34 pairs in total). The sawing direction to gain long sides was from pith to face side so that the one narrow side mainly contains juvenile parts while the other side mainly contains mature parts. As a result, the values of bending strength and Young's modulus in bending when the specimens were loaded from the core side were much higher than those when they were loaded from the face side. On the other hand, the behaviour of bending creep when the specimens were loaded from the face side was more stable than that when they were loaded from the core side.

Jensen J.L.,University of Auckland | Nakatani M.,Miyazaki Prefectural Wood Utilization Research Center | Quenneville P.,University of Auckland | Walford B.,Scion Research
Construction and Building Materials | Year: 2012

A simple model based on quasi non-linear fracture mechanics is presented for estimating the withdrawal failure load of screws embedded in wood. The model takes into account major geometrical parameters such as the shank diameter, the length of the threaded area of the screw, the thread projection, and the pitch, and material properties such as the modulus of elasticity of the wood and the screw, the shear strength, and the fracture energy of the wood. Damage caused to the wood when driving the screw into the wood may be taken into account by assuming the presence of either initial shear stresses or an initial crack. The initial shear stress or the initial crack length is used as an empirically determined fitting parameter. Theoretical predictions are compared with experimental results of lag screws placed parallel to grain in end wood and subjected to withdrawal. © 2011 Elsevier Ltd. All rights reserved.

Akaki T.,Miyazaki Prefectural Wood Utilization Research Center | Maehara H.,Kumamoto University | Tooyama M.,Forestry Research and Instruction Station of Kumamoto Prefecture
Journal of Wood Science | Year: 2012

For making efficient use of waste wood ash emitted from wood biomass plant, the wood and wood ash-based hydroxyapatite (HAp) composite was produced and their flammability characterization was studied by thermogravimetric (DTA-TG) analysis, oxygen index (OI) measurement and cone calorimeter test. The results show that the exothermic and weight loss peaks in DTA-TG combustion profiles due to their significant thermal decomposition were weakened by the HAp agent impregnation. In addition, the OI value of HAp composites was increased by the HAp combining and the OI showed a correlation with the HAp contents. Also, the cone calorimeter study revealed that the heat release rates were decreased with increasing amount of HAp injection and accordingly their total heat release has an inverse relationship to the HAp contents. These results indicate that the treatment with wood ash-based HAp agents can enhance the flame retardancy of the treated woods. © 2012 The Japan Wood Research Society.

Nakatani M.,Miyazaki Prefectural Wood Utilization Research Center | Mori T.,Kyoto University
AIJ Journal of Technology and Design | Year: 2016

A moment resisting joint with lagscrewbolts shows good mechanical performance and aesthetic view due to not exposing the connectors to the outside. However, the beam and column joints rarely showed a brittle shear failure at the panel zone of the column surrounded by the lagscrewbolts. In this research, a joint system reinforced by long wood screws was confirmed to improve the strength properties and prevent from the failure at the early stage. As the results, the maximum shear strength and stiffness increased with increasing the number of the screws embedded with a comfortable space between each lagscrewbolts and edge distance.

Shiiba A.,Miyazaki Prefectural Wood Utilization Research Center | Aratake S.,Miyazaki Prefectural Wood Utilization Research Center | Morita H.,Miyazaki Prefectural Wood Utilization Research Center
World Conference on Timber Engineering 2012, WCTE 2012 | Year: 2012

Material characteristics of large diameter sugi logs grown in Miyazaki and flat squares sawn from them were investigated and their bending performances were examined. Modulus of elasticity from longitudinal vibration (Et) of first logs was about 19% lower than that of second logs. However, modulus of rupture in bending (MOR) was only 2% different between lumber without pith sawn from first logs by taper rule sawing and lumber with pith sawn from second logs by center rule sawing, and the difference was not significant. In relationships between Et of logs and Et of flat squares,Et increased only 2% for lumber with pith obtained from second logs, while E t increased 25% for lumber without pith obtained from first logs. It shows that taper rule sawing is an effective method to improve the bending performances. Copyright © (2012) by WCTE 2012 Committee.

Arima T.,Miyazaki Prefectural Wood Utilization Research Center
11th World Conference on Timber Engineering 2010, WCTE 2010 | Year: 2010

Wooden construction is referred as an "urban forest". The volume of wood presently occupying the wooden structures of Japan account for 48% of the wood in the country's plantation forests and 20% of the total volume of all forests in Japan. The amount of energy saved by substituting wood for the other materials and the effect of biomass energy use on carbon dioxide emission reduction are to be quantitatively analyzed. When looked at in this way, areas which are populated with wooden housing and wooden construction can be very appropriately called a "forest". Naturally, the purpose of calling wooden construction a "forest" alludes to the "Sustainable Society " which should be strived for and would be unthinkable without the connection between the forests and the city.

Yanaga K.,Tottori University | Sotome K.,Tottori University | Suhara H.,Miyazaki Prefectural Wood Utilization Research Center | Maekawa N.,Tottori University
Mycoscience | Year: 2015

A new basidiolichen species, Lepidostroma asianum (Agaricomycetes, Lepidostromatales, Lepidostromataceae), is described based on basidiomata collected from red clay in southwestern Japan. This is the first report of a species in the genus Lepidostroma from Asia. The species is characterized by producing pale orange to reddish-orange, cylindrical to slightly fusiform basidiomata that taper toward the apex and by cylindrical to suballantoid basidiospores measuring 7.0-10.0 × 3.5-5.0 μm. In addition, it is associated with a green alga and forms a film-like thallus. Lepidostroma asianum differs from all previously-described species in its unique combination of these characteristics. Phylogenetic analyses of partial nuclear large subunit and small subunit rRNA gene sequences also differentiated it from other species. The cultural features of a Lepidostroma species are also provided for the first time. © 2014 Published by Elsevier B.V. on behalf of the Mycological Society of Japan.

Suhara H.,Miyazaki Prefectural Wood Utilization Research Center | Kurogi S.,Miyazaki Prefectural Board of Education
Mycological Progress | Year: 2015

We describe a new species, Cantharellus cyphelloides (Cantharellaceae, Cantharellales, Agaricomycetes), from a Japanese evergreen broad-leaved forest based on morphological and molecular data. The new species differs from other Cantharellus species by its cyphelloid basidiomata with the hymenophore produced on the adaxial surface (inner side of the cup), rather than the abaxial surface. Molecular phylogenetic reconstruction, based on partial nLSU rDNA sequence data, and microscopic features place the new species in Cantharellus subgenus Cinnabarinus. An emended description of subgenus Cinnabarinus is provided. © 2015, German Mycological Society and Springer-Verlag Berlin Heidelberg.

PubMed | Miyazaki Prefectural Wood Utilization Research Center, Kyushu University and Nepal Agriculture Research Council
Type: Journal Article | Journal: Journal of natural medicines | Year: 2016

Mushrooms have garnered immense popularity for their nutritional as well as medicinal values. The therapeutic potential of mushrooms in Nepal, a country well known for its biodiversity and natural medicinal resources, remains largely unstudied. Therefore, this study attempts to unveil the antioxidative properties of Nepalese wild mushrooms. Sixty-two wild mushroom samples were collected from several forests in different parts of Nepal. Ethanol and water extracts of the dried samples were tested for their antioxidative activities using total phenolic content (TPC), oxygen radical absorbance capacity (ORAC) assay, 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), and reducing power (RP) assays. Ethanol extracts of samples belonging to the order Hymenochaetales showed significantly high activity in all the assays. Inonotus clemensiae had an exceptionally high TPC of 643.2mg gallic acid equivalent (GAE)/g extract and also exhibited the lowest EC50 values in DPPH (0.081mg/mL), ABTS (0.409mg/mL), and EC0.5 value in reducing power (RP; 0.031mg/mL) assays. High-performance liquid chromatography (HPLC) analysis of the top ten samples with the highest TPC was done to identify the phenolic compounds in the extracts, followed by liquid chromatography-mass spectrometry (LC-MS) analysis for some unknown compounds. These findings highlight the very strong antioxidative activity of Nepalese mushrooms, and paves the way for further research to explore their economic potential.

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