Journal of the Japan Wood Research Society最新文献_第3页

Analysis of the Modulus of Rupture of Particleboard Subjected to Outdoor Exposure Using a Generalized Linear Mode 用广义线性模型分析室外暴露下刨花板的破裂模量

Journal of the Japan Wood Research Society Pub Date : 2017-01-01 DOI: 10.2488/JWRS.63.277

H. Korai, Ken Watanabe, K. Nakao, Tomoyuki Hayashi

引用次数: 0

Reuse of Wood Used in Underground Construction and Suggestion of a Method of Differentiation 地下建筑木材再利用及鉴别方法的建议

Journal of the Japan Wood Research Society Pub Date : 2017-01-01 DOI: 10.2488/JWRS.63.214

Kaori Mimura, T. Hara, Hideo Kato, M. Noguchi, A. Hirata, K. Honda, T. Matsuhashi

{"title":"Reuse of Wood Used in Underground Construction and Suggestion of a Method of Differentiation","authors":"Kaori Mimura, T. Hara, Hideo Kato, M. Noguchi, A. Hirata, K. Honda, T. Matsuhashi","doi":"10.2488/JWRS.63.214","DOIUrl":"https://doi.org/10.2488/JWRS.63.214","url":null,"abstract":"When demolishing a structure, reusable and secondary materials are obtained, such as lumps of as-phalt and concrete, including articles of excavated construction wood. Most especially, waste woods should be aimed at recycling with the view of effective utilization of resources, controlling wastes generated and conserving the environment. However, they are disposed of as industrial wastes in many cases, because specific uses and methods are not standardized. On the other hand, underground use of wood for the purpose of ground improvement has been suggested as new utilization of logs in large quantities. However, there are few cases in which logs excavated from construction sites are recycled for underground use because their strength and soundness cannot be specified. This study suggests an economical judging method by which timbers generated during construction that would be available for recycling can be identified on site by including excavated materials generated from locations with high moisture content because always being buried in water. wood, youngʼs modulus, longitudinal vibration test","PeriodicalId":17248,"journal":{"name":"Journal of the Japan Wood Research Society","volume":"63 1","pages":"214-222"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85295679","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}

引用次数: 1

Effect of Heat Drying Treatment on Extracts of Sugi ( Cryptomeria japonica ) Board: Quantitative change of terpenes by moderate-temperature drying treatments@@@中温乾燥によるテルペン類の量的変化 Effect of Heat Drying Treatment on Extracts of Sugi (Cryptomeria japonica) Board:Quantitative change of terpenes by moderate-temperature drying treatments@@@中温干燥引起的萜烯类的数量变化

Journal of the Japan Wood Research Society Pub Date : 2017-01-01 DOI: 10.2488/JWRS.63.204

Taku Okuda, T. Nakagawa, Tomoya Murano, Y. Miyoshi, Hirohito Kamei, Takao Sasaki, Yasuhiro Saigusa, Yoshiyuki Wada, Syunji Minato, S. Sakai, Taizou Chiri, N. Fujimoto, Kuniyoshi Shimizu

{"title":"Effect of Heat Drying Treatment on Extracts of Sugi ( Cryptomeria japonica ) Board: Quantitative change of terpenes by moderate-temperature drying treatments@@@中温乾燥によるテルペン類の量的変化","authors":"Taku Okuda, T. Nakagawa, Tomoya Murano, Y. Miyoshi, Hirohito Kamei, Takao Sasaki, Yasuhiro Saigusa, Yoshiyuki Wada, Syunji Minato, S. Sakai, Taizou Chiri, N. Fujimoto, Kuniyoshi Shimizu","doi":"10.2488/JWRS.63.204","DOIUrl":"https://doi.org/10.2488/JWRS.63.204","url":null,"abstract":"To investigate the quantitative change of terpenes in sugi (Cryptomeria japonica) board caused by moderate-temperature drying treatments, extracts of sugi board dried by vacuum, conventional kiln, electric heat and air were analyzed by gas chromatograph/mass spectrometer (GC/MS). Extract samples were prepared at 0-1, 1-2 and 17-18 mm from the surface of dried boards using a planer. The results were as follows. Total content of the extracts detected by GC/MS was less in vacuum-dried board than in air-dried board at all three surface depths. Content of sesquiterpene hydrocarbon at 0-1, 1-2 and 17-18 mm from the surface of vacuum-dried board, at 0-1 and 1-2 mm from the surface of conventional kiln-dried board and at 0-1 mm from the surface of electric heat-dried board was less than in air-dried board. Content of oxygenated sesquiterpene at 0-1 mm from the surface of vacuum-dried board and at 0-1 mm from the surface of conventional kiln-dried board was less than in air-dried board. Content of diterpene hydrocarbon: there were no significant differences between drying treatments. Content of oxygenated diterpene at 17-18 mm from the surface of electric heat-dried board was less than in air-dried board. In conclusion, we showed that a portion of terpenes in sugi board exposed to","PeriodicalId":17248,"journal":{"name":"Journal of the Japan Wood Research Society","volume":"12 1","pages":"204-213"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80030488","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}

引用次数: 0

Journal of the Japan Wood Research Society Pub Date : 2016-11-25 DOI: 10.2488/JWRS.62.275

美音吉田, 匡司仲村, 由衣菊地

引用次数: 1

Color Changes of Wood during Natural Aging and Heat Treatment 木材在自然老化和热处理过程中的颜色变化

Journal of the Japan Wood Research Society Pub Date : 2016-11-01 DOI: 10.2488/JWRS.62.266

M. Matsuo, Hiroyuki Yamamoto, K. Umemura, S. Kawai

引用次数: 3

希少な天然秋田スギ"アオヤジロ"の材質特性稀少的天然秋田杉"蓝白"的材质特性

Journal of the Japan Wood Research Society Pub Date : 2016-09-25 DOI: 10.2488/jwrs.62.153

博佐藤, 栄澁谷, 克彦高田

引用次数: 0

木材－ボルト接合における座金のめり込み挙動解析（第1報）木材-螺栓接合时座金的嵌入行为分析(第1报)

Journal of the Japan Wood Research Society Pub Date : 2016-07-25 DOI: 10.2488/JWRS.62.119

独歩松原, 勝廣島田, 卓郎平井, 良船田, 順昭服部

引用次数: 3

成長に伴うモウソウチク（Phyllostachys pubescens）の物性発現機構（第1報）伴随成长的增殖(Phyllostachys pubescens)的物性表现机制(第1报)

Journal of the Japan Wood Research Society Pub Date : 2016-05-25 DOI: 10.2488/JWRS.62.61

智明桐生, 由華三好, 裕三古田

引用次数: 4

Relationship between Vertical Load Properties of Floors and Human Sensory Evaluation of Walking Vibration in Wooden Schools and Offices I.: Static and dynamic properties of large-span wooden floors@@@木造大スパン床の静的および振動性状木质学校和办公场所地板垂直荷载特性与人的感官行走振动评价的关系ⅰ.大跨度木地板的静、动态特性

Journal of the Japan Wood Research Society Pub Date : 2016-01-01 DOI: 10.2488/JWRS.62.101

Ken-ichi Sugimoto, N. Nakamura, Eiichi Fujino, Y. Sano, Satoshi Shindo, Takahisa Kamada, Seiichiro Ukyo, Masaya Gonda

{"title":"Relationship between Vertical Load Properties of Floors and Human Sensory Evaluation of Walking Vibration in Wooden Schools and Offices I.: Static and dynamic properties of large-span wooden floors@@@木造大スパン床の静的および振動性状","authors":"Ken-ichi Sugimoto, N. Nakamura, Eiichi Fujino, Y. Sano, Satoshi Shindo, Takahisa Kamada, Seiichiro Ukyo, Masaya Gonda","doi":"10.2488/JWRS.62.101","DOIUrl":"https://doi.org/10.2488/JWRS.62.101","url":null,"abstract":"To clarify the static and dynamic properties of large-span wooden floors, we measured static deflection, bending stiffness, natural frequency and damping ratio of floors at four wooden schools and two wooden offices. The initial design deflection to span ratio was approximately 1/430 to 1/1100 for these floors. In addition, design deflections including creep to span ratio was approximately 1/280 to 1/800. These values were within the limitations defined by the Building Standards Law and the Standard for Structural Design of Timber Structures of the Architectural Institute of Japan, except for one elementary school. The experimental bending stiffness of beams or trusses was 1.1 to 3.9 times larger than the design value. On the other hand, the measured natural frequency of floors in actual wooden buildings ranged from 9.5 to 12 Hz. These values could be relatively accurately estimated using the theory of simply supported beams with applied dead loads. Additionally, the damping ratios ranged from 3.1 to 6.5%, almost the same as those in previous studies.","PeriodicalId":17248,"journal":{"name":"Journal of the Japan Wood Research Society","volume":"305 1","pages":"101-107"},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75288520","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}

引用次数: 0

Optimizing the Parameters of a Knot Assessment Model Based on the Visual Grading of JAS of Lumber 基于木材JAS视觉分级的结度评价模型参数优化

Journal of the Japan Wood Research Society Pub Date : 2016-01-01 DOI: 10.2488/JWRS.62.133

Kai Moriguchi, Naoaki Shibata, M. Imai, Masato Yamanouchi, Takahisa Yoshida

{"title":"Optimizing the Parameters of a Knot Assessment Model Based on the Visual Grading of JAS of Lumber","authors":"Kai Moriguchi, Naoaki Shibata, M. Imai, Masato Yamanouchi, Takahisa Yoshida","doi":"10.2488/JWRS.62.133","DOIUrl":"https://doi.org/10.2488/JWRS.62.133","url":null,"abstract":"We defined a knot assessment model based on the visual grading of Japanese Agricultural Standard （JAS） of lumber and attempted to optimize parameters of the model using simulated annealing. Parameters of the knot assessment model were optimized by maximizing coefficients of determination of regression models, using data of bending tests and surface images of 40 test pieces, 120 mm square cross section kiln-dried lumber with pith of Japanese larch （(cid:9488)(cid:9509)(cid:9526)(cid:9517)(cid:9532)(cid:9444)(cid:9519)(cid:9509)(cid:9513)(cid:9521)(cid:9524)(cid:9514)(cid:9513)(cid:9526)(cid:9517) Lamb.）. Values of the coefficient of determination of regression models using knot index values of optimized knot assessment models were much larger than those obtained by ordinary visual grading. However, knot index values of almost all test pieces were decided by a particular type of knot diameter ratio, suggesting overfitting. We then simplified the knot assessment model, eliminating the distinction between center or edge areas and types of single knot. Values of the coefficient of determination of regression models were then decreased compared to those of the above optimized knot assessment models. However, they were still larger than those based on ordinary visual grading, and there were significant differences between correlation coefficients of each single regression model.","PeriodicalId":17248,"journal":{"name":"Journal of the Japan Wood Research Society","volume":"12 1","pages":"133-145"},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83543494","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}

引用次数: 2