{"title":"バスーンリード用葦材( Arundo donax )の表皮色と振動特性の関係","authors":"早貴 小峰, 啓一 前田, 聡 信田","doi":"10.2488/JWRS.63.189","DOIUrl":"https://doi.org/10.2488/JWRS.63.189","url":null,"abstract":"","PeriodicalId":17248,"journal":{"name":"Journal of the Japan Wood Research Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72558311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ken-ichi Sugimoto, N. Nakamura, Y. Sano, Eiichi Fujino, Satoshi Shindo, Takahisa Kamada, Seiichiro Ukyo, Masaya Gonda
Walking is an essential part of life or work and causes floor vibrations. Recently, the need for largescale wooden buildings has been increasing. However, there is no guide to design for floor vibrations caused by walking of large-span wooden floors. Therefore we considered the relationship between vertical vibration and properties of wooden school and office floors and human sensory evaluation. We found that the percentage of persons indicating perception of vibration, expecting those who answered unnoticed, was larger than the perception probability indicated in Guideline for the evaluation of habitability to building vibration published by Architectural Institute of Japan (AIJ). When the floor response acceleration was over 4 cm/s, the percentage of persons who perceived the vibration was 100 %. At the next step, we considered the relationship between the weighted acceleration level according to frequencies and the ratio of deflections including creep to spans, calculated by the experimental stiffness. Finally we suggest a tentative design target for large-span wooden floor as follows. In order to
{"title":"Relationship between the Vertical Load Properties of Floors and Human Sensory Evaluations of Walking Vibration in Wooden Schools and Offices II.: Possibility of a tentative design target for large-span wooden floors according to human sensory evaluations of walking vibration@@@歩行振動の感覚評価による木造大スパン床の設計","authors":"Ken-ichi Sugimoto, N. Nakamura, Y. Sano, Eiichi Fujino, Satoshi Shindo, Takahisa Kamada, Seiichiro Ukyo, Masaya Gonda","doi":"10.2488/JWRS.63.98","DOIUrl":"https://doi.org/10.2488/JWRS.63.98","url":null,"abstract":"Walking is an essential part of life or work and causes floor vibrations. Recently, the need for largescale wooden buildings has been increasing. However, there is no guide to design for floor vibrations caused by walking of large-span wooden floors. Therefore we considered the relationship between vertical vibration and properties of wooden school and office floors and human sensory evaluation. We found that the percentage of persons indicating perception of vibration, expecting those who answered unnoticed, was larger than the perception probability indicated in Guideline for the evaluation of habitability to building vibration published by Architectural Institute of Japan (AIJ). When the floor response acceleration was over 4 cm/s, the percentage of persons who perceived the vibration was 100 %. At the next step, we considered the relationship between the weighted acceleration level according to frequencies and the ratio of deflections including creep to spans, calculated by the experimental stiffness. Finally we suggest a tentative design target for large-span wooden floor as follows. In order to","PeriodicalId":17248,"journal":{"name":"Journal of the Japan Wood Research Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76458395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"成長に伴うモウソウチク（Phyllostachys pubescens）の物性発現機構（第2報）","authors":"智明 桐生, 尚子 松田, 圭輔 神代, 裕三 古田","doi":"10.2488/JWRS.63.14","DOIUrl":"https://doi.org/10.2488/JWRS.63.14","url":null,"abstract":"","PeriodicalId":17248,"journal":{"name":"Journal of the Japan Wood Research Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79799412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Fundamental Research of an Evaluation Method of Splitting Failure in Timber I.: Differences of wood species and evaluation method of splitting failure by the CT test specimen@@@CT試験における樹種の差異と耐力推定法","authors":"Y. Ochiai, K. Aoki, Masahiro Inayama","doi":"10.2488/JWRS.63.269","DOIUrl":"https://doi.org/10.2488/JWRS.63.269","url":null,"abstract":"","PeriodicalId":17248,"journal":{"name":"Journal of the Japan Wood Research Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73855956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Sugiyama, Y. Kataoka, Tadao Yatougo, M. Matsunaga, H. Matsui
To evaluate the suitability of wood for welfare use, the impression of, and preference for mobile phones with three different outer panel materials (metal, plastic, or wood) were examined using the Semantic Differential method. The mobile phones are intended to be used as portable assistive devices for mothers of autistic individuals. The results were subjected to factor analysis using the following four factors: “durability and maintainability”, “image of material”, “quality” and “surface texture”. The following results were obtained using multiple regression analyses: 1) both favorable impression and one’s interest to purchase are highly affected by the surface texture, 2) although the image of material affects favorable impression, it does not influence one’s interest to purchase, and 3) stain resistance contributes significantly to one’s interest to purchase, but does not affect favorable impression. It was found that the unique texture of the wood surface affects both favorable impression and one’s interest to purchase; however, the image of material of the wood affects the favorable impression but does not influence one’s interest to purchase.
{"title":"Impression of and Preference for Portable Assistive Devices with Wooden, Plastic or Metal Outer Panels among Mothers of Individuals with Autism","authors":"M. Sugiyama, Y. Kataoka, Tadao Yatougo, M. Matsunaga, H. Matsui","doi":"10.2488/jwrs.63.21","DOIUrl":"https://doi.org/10.2488/jwrs.63.21","url":null,"abstract":"To evaluate the suitability of wood for welfare use, the impression of, and preference for mobile phones with three different outer panel materials (metal, plastic, or wood) were examined using the Semantic Differential method. The mobile phones are intended to be used as portable assistive devices for mothers of autistic individuals. The results were subjected to factor analysis using the following four factors: “durability and maintainability”, “image of material”, “quality” and “surface texture”. The following results were obtained using multiple regression analyses: 1) both favorable impression and one’s interest to purchase are highly affected by the surface texture, 2) although the image of material affects favorable impression, it does not influence one’s interest to purchase, and 3) stain resistance contributes significantly to one’s interest to purchase, but does not affect favorable impression. It was found that the unique texture of the wood surface affects both favorable impression and one’s interest to purchase; however, the image of material of the wood affects the favorable impression but does not influence one’s interest to purchase.","PeriodicalId":17248,"journal":{"name":"Journal of the Japan Wood Research Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79913546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Kubojima, T. Yanagida, Takahiro Yoshida, M. Kiguchi
In this study, we investigated the relationship between weight reduction and color change in torrefied wood chips. We heated Japanese cedar （(cid:9479)(cid:9526)(cid:9533)(cid:9524)(cid:9528)(cid:9523)(cid:9521)(cid:9513)(cid:9526)(cid:9517)(cid:9509)(cid:9444)(cid:9518)(cid:9509)(cid:9524)(cid:9523)(cid:9522)(cid:9517)(cid:9511)(cid:9509) and specimens with dimensions of 29 mm × 29 mm × 5 mm at 200 °C, 230 °C, and 250 °C for 0 − 360 min and then obtained color data. We found correlations between (cid:9488)* and the oven-dry weight ratio after/ before heating （(cid:9499)/(cid:9499) 0 ）, (cid:9488)*+(cid:9509)* and (cid:9499)/(cid:9499) 0 , and (cid:9488)*+(cid:9510)* and (cid:9499)/(cid:9499) 0 . The values of (cid:9488)*, (cid:9488)*+(cid:9509)*, and (cid:9488)*+(cid:9510)* after torrefaction were suitable for accurately and simply estimating the weight reduction of the torrefied chips. Both heartwood and sapwood samples can be used for these estimations without the need to separate them because we found the relationships between the color data and (cid:9499)/(cid:9499) 0 for the heartwood to be very similar to those for the sapwood. However, it is necessary to separate the LR-, LT-, and RT-planes because their corresponding color data and (cid:9499)/(cid:9499) 0 were not similar. Although the torrefied chips become darkened, their grains remain visually distinguishable. トレファクションチップの炭化の程度を正確かつ簡便に得る方法を開発する目的で，半炭化処
{"title":"Simple Estimation Method for Determining Weight Reduction in Torrefied Wood Chips by Color Data","authors":"Y. Kubojima, T. Yanagida, Takahiro Yoshida, M. Kiguchi","doi":"10.2488/JWRS.63.176","DOIUrl":"https://doi.org/10.2488/JWRS.63.176","url":null,"abstract":"In this study, we investigated the relationship between weight reduction and color change in torrefied wood chips. We heated Japanese cedar （(cid:9479)(cid:9526)(cid:9533)(cid:9524)(cid:9528)(cid:9523)(cid:9521)(cid:9513)(cid:9526)(cid:9517)(cid:9509)(cid:9444)(cid:9518)(cid:9509)(cid:9524)(cid:9523)(cid:9522)(cid:9517)(cid:9511)(cid:9509) and specimens with dimensions of 29 mm × 29 mm × 5 mm at 200 °C, 230 °C, and 250 °C for 0 − 360 min and then obtained color data. We found correlations between (cid:9488)* and the oven-dry weight ratio after/ before heating （(cid:9499)/(cid:9499) 0 ）, (cid:9488)*+(cid:9509)* and (cid:9499)/(cid:9499) 0 , and (cid:9488)*+(cid:9510)* and (cid:9499)/(cid:9499) 0 . The values of (cid:9488)*, (cid:9488)*+(cid:9509)*, and (cid:9488)*+(cid:9510)* after torrefaction were suitable for accurately and simply estimating the weight reduction of the torrefied chips. Both heartwood and sapwood samples can be used for these estimations without the need to separate them because we found the relationships between the color data and (cid:9499)/(cid:9499) 0 for the heartwood to be very similar to those for the sapwood. However, it is necessary to separate the LR-, LT-, and RT-planes because their corresponding color data and (cid:9499)/(cid:9499) 0 were not similar. Although the torrefied chips become darkened, their grains remain visually distinguishable. トレファクションチップの炭化の程度を正確かつ簡便に得る方法を開発する目的で，半炭化処","PeriodicalId":17248,"journal":{"name":"Journal of the Japan Wood Research Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86289000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ken Watanabe, H. Korai, Isao Kobayashi, T. Yanagida, Keisuke Toba, Kosei Mitsui
Air-drying is one of the most frequently used operations to dehydrate logging residues for produc-tion of wood fuel chips. This study developed a drying curve model for the air-drying of logs in order to estimate drying time to reach a given moisture level, and to evaluate the influence of log properties on drying characteristics of logs. Log piles of sugi （(cid:9479)(cid:9526)(cid:9533)(cid:9524)(cid:9528)(cid:9523)(cid:9521)(cid:9513)(cid:9526)(cid:9517)(cid:9509)(cid:9444)(cid:9518)(cid:9509)(cid:9524)(cid:9523)(cid:9522)(cid:9517)(cid:9511)(cid:9509)） were air-dried in Tsukuba city, Japan, from November 2014 to August 2015. A hierarchical Bayesian model was used to estimate the moisture content of individual logs as a function of initial moisture content, diameter, length, heartwood ratio, and drying time. The measured mean moisture content fit well to the estimated drying curve, indicating that the developed model is a potentially useful method to estimate the drying time for any moisture content within the limited range of climate conditions studied here. A comprehensive evaluation of log properties affecting the drying characteristics of logs showed that initial moisture content, diameter, and length have an influence on the drying rate of logs. time, hierarchical Bayesian model.
{"title":"Estimation of Drying Time for Air-drying of Logs and Evaluation of Log Properties Affecting Drying Characteristics of Logs Using a Hierarchical Bayesian Model","authors":"Ken Watanabe, H. Korai, Isao Kobayashi, T. Yanagida, Keisuke Toba, Kosei Mitsui","doi":"10.2488/JWRS.63.63","DOIUrl":"https://doi.org/10.2488/JWRS.63.63","url":null,"abstract":"Air-drying is one of the most frequently used operations to dehydrate logging residues for produc-tion of wood fuel chips. This study developed a drying curve model for the air-drying of logs in order to estimate drying time to reach a given moisture level, and to evaluate the influence of log properties on drying characteristics of logs. Log piles of sugi （(cid:9479)(cid:9526)(cid:9533)(cid:9524)(cid:9528)(cid:9523)(cid:9521)(cid:9513)(cid:9526)(cid:9517)(cid:9509)(cid:9444)(cid:9518)(cid:9509)(cid:9524)(cid:9523)(cid:9522)(cid:9517)(cid:9511)(cid:9509)） were air-dried in Tsukuba city, Japan, from November 2014 to August 2015. A hierarchical Bayesian model was used to estimate the moisture content of individual logs as a function of initial moisture content, diameter, length, heartwood ratio, and drying time. The measured mean moisture content fit well to the estimated drying curve, indicating that the developed model is a potentially useful method to estimate the drying time for any moisture content within the limited range of climate conditions studied here. A comprehensive evaluation of log properties affecting the drying characteristics of logs showed that initial moisture content, diameter, and length have an influence on the drying rate of logs. time, hierarchical Bayesian model.","PeriodicalId":17248,"journal":{"name":"Journal of the Japan Wood Research Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77966200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yasuhiro Utsumi, Y. Shiiba, Ikue Murata, Y. Yasuda, S. Koga, S. Nagai, S. Inoue
{"title":"Evaluation of Physical and Mechanical Properties and Durability of Wood in Traditionally Used Trees in Shiiba Village, Miyazaki Prefecture","authors":"Yasuhiro Utsumi, Y. Shiiba, Ikue Murata, Y. Yasuda, S. Koga, S. Nagai, S. Inoue","doi":"10.2488/JWRS.63.73","DOIUrl":"https://doi.org/10.2488/JWRS.63.73","url":null,"abstract":"","PeriodicalId":17248,"journal":{"name":"Journal of the Japan Wood Research Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76269299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Minako Shitara, Hiroaki Yoshida, M. Kamijo, G. Fujimaki, Hodaka Yamaguchi
When people encounter wooden products, they tend to unthinkingly take them in their hands and evaluate them in a multisensory manner based on both visual and tactile cues. Using specimens made of four types of wood and finished with two types of coating, we investigated the process of sensory inspection to identify which of these two perceptions plays the paramount role in the formation of subjects’ visual and tactile impressions of wooden specimens. A multiple regression analysis of the relationship between the combined visual-tactile perception and its constituent visual and tactile components revealed that although visual perception played the dominant role overall, information from tactile receptors in the form of perceptions of the specimens’ temperature, roughness, and moistness had a significant effect on subjects’ impressions. An investigation of the relationship between subjects’ visual and tactile perceptions and the material properties of the specimens suggested that subjects’ impressions of the wooden specimens were linked to tactile perceptions shaped by specimen roughness and visual perceptions shaped by specimen brightness.
{"title":"Formation of Visual and Tactile Impressions When Evaluating Wooden Specimens","authors":"Minako Shitara, Hiroaki Yoshida, M. Kamijo, G. Fujimaki, Hodaka Yamaguchi","doi":"10.2488/JWRS.63.149","DOIUrl":"https://doi.org/10.2488/JWRS.63.149","url":null,"abstract":"When people encounter wooden products, they tend to unthinkingly take them in their hands and evaluate them in a multisensory manner based on both visual and tactile cues. Using specimens made of four types of wood and finished with two types of coating, we investigated the process of sensory inspection to identify which of these two perceptions plays the paramount role in the formation of subjects’ visual and tactile impressions of wooden specimens. A multiple regression analysis of the relationship between the combined visual-tactile perception and its constituent visual and tactile components revealed that although visual perception played the dominant role overall, information from tactile receptors in the form of perceptions of the specimens’ temperature, roughness, and moistness had a significant effect on subjects’ impressions. An investigation of the relationship between subjects’ visual and tactile perceptions and the material properties of the specimens suggested that subjects’ impressions of the wooden specimens were linked to tactile perceptions shaped by specimen roughness and visual perceptions shaped by specimen brightness.","PeriodicalId":17248,"journal":{"name":"Journal of the Japan Wood Research Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84060426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hirokazu Ito, S. Ogoe, M. Okamoto, Shigehiko Suzuki, Y. Kojima, H. Kobori, A. Isa, T. Endo
A newly developed production method for wood flour was proposed for a wood-plastic composite （WPC） and its mechanical properties were investigated. This production process consists of step-wise wet milling using a disk mill, drying, and dry milling by a disk mill. The developed method makes it possible to easily produce fibrillated and uniformly-sized wood flour. The mechanical properties of polypropylene-based WPC were improved by the addition of the produced wood flour. These results suggest that wood WPC has the potential to be introduced into the field of automotive plastics.
{"title":"Properties of Fibrillated Wood Flour, and of Wood-plastic Composites Made with Fibrillated Wood Flour","authors":"Hirokazu Ito, S. Ogoe, M. Okamoto, Shigehiko Suzuki, Y. Kojima, H. Kobori, A. Isa, T. Endo","doi":"10.2488/JWRS.63.131","DOIUrl":"https://doi.org/10.2488/JWRS.63.131","url":null,"abstract":"A newly developed production method for wood flour was proposed for a wood-plastic composite （WPC） and its mechanical properties were investigated. This production process consists of step-wise wet milling using a disk mill, drying, and dry milling by a disk mill. The developed method makes it possible to easily produce fibrillated and uniformly-sized wood flour. The mechanical properties of polypropylene-based WPC were improved by the addition of the produced wood flour. These results suggest that wood WPC has the potential to be introduced into the field of automotive plastics.","PeriodicalId":17248,"journal":{"name":"Journal of the Japan Wood Research Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88350114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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