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Changes in value-added wood product manufacturer perceptions about certification in the United States from 2002 to 2008
certification United States wood products value-added manufacturers
2009/7/21
Certification is a voluntary mechanism which involves assessing either forest management practices or chain-of-custody tracking through supply chains against a set of standards. Certification is bec...
Changes of Mechanical Properties of Wood under an Unstable State by Heating or Cooling
stress relaxation unstable state temperature history amount of fluidity
2009/3/6
In this paper stress relaxation of water-swollen wood was discussed with two conditions of temperature change, i.e. 1) specimens at 20°C were heated rapidly to 30-80°C, and 2) specimens at 30-80°C wer...
The effects of treatment with NaOH aqueous solution on the shape of Yezo spruce (Picea jezoensis Carr.) and its mechanism were examined by comparison with results for ramie fibers. Wood samples contra...
Effect of Changes in the Moisture Content due to Surrounding Relative Humidity on the Contact Stress in Traditional Mortise and Tenon Joints III
compressed sugi komisen hozo-komisen mortise and tenon change of humidity
2009/3/6
This research is focused on evaluating the efficiency and failure mechanism of joints using a komisen (Japanese traditional square key) of compressed sugi (Japanese ceder ;Cryptomeria japonica D. Don)...
Mechanical Properties of Wood in an Unstable State due to Temperature Changes, and an Analysis of the Relevant Mechanism II
wood block uniform elimination lignin hemicellulose
2009/3/6
In order to prepare wood specimens for subsequent measurements of mechanical properties, we examined the selective and uniform elimination of wood constituents from a 4 mm thick cross section of hino...
Effect of Changes in the Moisture Content due to Surrounding Relative Humidity on the Contact Stress in Traditional Mortise and Tenon Joints II.
komisen compressed wood contact stress mortise and tenon joint
2009/3/6
This research is a continuation of part 11), and focuses on studying the effect of cyclic humidity changes. It also evaluates the anti-relaxation effect by deformation recovery of the komisen(wooden ...
Mechanical Properties of Wood in an Unstable State due to Temperature Changes, and an Analysis of the Relevant Mechanism I.
quenching swollen wood variations of temperature stress relaxation fluidity
2009/3/6
To study mechanical properties of wood exposed to variations of temperature, in this study the swollen wood (water-swollen wood & ethylene glycol-swollen wood) was preheated at 30-180°C and quenched t...
Effect of Changes in the Moisture Content due to Surrounding Relative Humidity on the Contact Stress in Traditional Mortise and Tenon Joints I.
komisen mortise and tenon contact stress compressed sugi
2009/3/6
To understand the stress transmission mechanism in the traditional timber joint, focus was aimed on the contact stress which occurs at the contact surface of mortise and tenon joints. More precisely, ...
Changes of Indoor Humidity in Various Living Spaces
log house wooden house reinforced concrete building various living spaces indoor nighttime humidity
2009/3/6
The changes in temperature and humidity in various living spaces were observed for about one year. As the windows and doors in any living spaces were mostly closed from 9 : 00 p.m. to 6 : 00 a.m., nig...
Mechanical Properties of Wood in an Unstable State due to Temperature Changes, and Analysis of the Relevant Mechanism V.
quenching thermal expansion thermal decomposition destabilization
2009/3/6
In order to define the effects of thermal expansion and thermal decomposition on the destabilization of quenched wood, we measured the stress relaxation of steam-treated wood and oven-dried wood under...
Fine Structure Changes of Wood during Moisture Adsorption and Desorption Process Analyzed by X-ray Diffraction Measurement
X-ray diffraction moisture condition differential scanning calorimeter thermogravimetric measurement
2009/3/6
To investigate the fine structure of wood in the non-equilibrium moisture condition, X-ray diffraction (XRD) analysis was conducted during moisture content changes in Japanese red pine specimens. The...
The Use of Phospholipid Fatty Acid Analysis to Estimate the Changes in Microbial Community Structure during Wood Decay in Forests
microbial community structure PLFA wood decay
2009/3/5
Phospholipid fatty acid (PLFA) analysis was used to estimate the changes in microbial community structure during decompositions of sugi and konara wood samples buried in soil of sugi plantation or bro...
Changes in Bending Properties and Shrinkage of Kiln Dried Todomatsu（Abies sachalinensis）Wetwood
wetwood static bending properties impact bending properties shrinkage high temperature drying
2009/3/4
Changes in bending properties and shrinkage of heat-treated todomatsu (Abies sachalinensis Mast.) wetwood were investigated. Specimens having dimensions of 7 mm(R)×7 mm(T)×115 mm(L) and 30 mm(R)×30 mm...
Longitudinal Changes of Basic Density and Non-Destructive Quality Evaluation Using the Pilodyn in Todomatsu（Abies sachalinensis）Plus Tree Clones
todomatsu clone longitudinal change basic density Pilodyn penetration
2009/3/4
The longitudinal changes in the basic density of disks (mean Bd) of todomatsu (Abies sachalinensis) were investigated using plus-tree clones and breeding-material clones. The relationship between Pilo...