Journal of the Korean wood science and technology最新文献_第8页

Termicidal Activity and Chemical Components of Wood Vinegar from Nipah Fruit against Coptotermes curvignathus 尼帕木醋对白蚁的杀虫活性及化学成分研究

Journal of the Korean wood science and technology Pub Date : 2022-09-01 DOI: 10.5658/wood.2022.50.5.315

H. A. Oramahi, Mika Jessika Tindaon, Nurhaida Nurhaida, F. Diba, H. Yanti

{"title":"Termicidal Activity and Chemical Components of Wood Vinegar from\u0000 Nipah Fruit against Coptotermes curvignathus","authors":"H. A. Oramahi, Mika Jessika Tindaon, Nurhaida Nurhaida, F. Diba, H. Yanti","doi":"10.5658/wood.2022.50.5.315","DOIUrl":"https://doi.org/10.5658/wood.2022.50.5.315","url":null,"abstract":"The termicidal activity and chemical components of wood vinegar from two sources of biomass, nipah fruit shells (NFS) and a mixture of shells and fiber (MSF), were evaluated against Coptotermes curvignathus . A no-choice test was carried out to evaluate their termicidal activity using filter paper samples treated with 2.5%, 5.0%, 7.5%, 10.0%, and 12.5% NFS or MSF vinegar. Both wood vinegars exhibited antitermitic activity against C. curvignathus . The results show that increased concentrations of NFS and MSF vinegar significantly increased termite mortality. In particular, the NFS vinegar caused complete mortality and the lowest filter paper mass losses at 2.18% when treated with 12.5% wood vinegar. The most abundant chemical compounds of NFS vinegar were cyclopropanecarbonyl chloride, 2,5-dichlorophenol, 2-propanone, acetic acid, propanoic acid, benzenesulfonic acid, 3,7-dimethyl-6-octenal, and trans-geraniol. Meanwhile, the main compounds in the MSF vinegar were 1,2-ethanediol, formic acid, acetic acid, ethanoic acid, 2-furancarboxaldehyde, phenol, 2-methoxy phenol, and 4-methyl phenol.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44751803","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: 5

Nanocomposite Electrode Materials Prepared from Pinus roxburghii and Hematite for Application in Supercapacitors 刺松和赤铁矿制备的超级电容器用纳米复合电极材料

Journal of the Korean wood science and technology Pub Date : 2022-05-01 DOI: 10.5658/wood.2022.50.4.219

D. Shrestha

{"title":"Nanocomposite Electrode Materials Prepared from Pinus\u0000 roxburghii and Hematite for Application in\u0000 Supercapacitors","authors":"D. Shrestha","doi":"10.5658/wood.2022.50.4.219","DOIUrl":"https://doi.org/10.5658/wood.2022.50.4.219","url":null,"abstract":"Wood-based nanocomposite electrode materials were synthesized for application in supercapacitors by mixing nanostructured hematite (Fe 2 O 3 ) with highly porous activated carbon (AC) produced from the wood-waste of Pinus roxburghii . The AC was characterized using various instrumental techniques and the results showed admirable electrochemical properties, such as high surface area and reasonable porosity. Firstly, AC was tested as an electrode material for supercapacitors and it showed a specific capacitance of 59.02 Fg –1 at a current density of 1 Ag –1 , cycle life of 84.2% after 1,000 cycles (at a current density of 3 Ag –1 ), and energy density of 5.1 Wh/kg at a power density of 135 Wkg –1 . However, when the AC was composited with different ratios of Fe 2 O 3 (1:1, 2:1, and 1:2), there was an overall improvement in its electrochemical performance. Among the 3 ratios, 2:1 (AC:Fe 2 O 3 ) had the best specific capacitance of 102.42 Fg –1 at 1 Ag –1 , cycle life of 94.4% capacitance after 1,000 cycles (at a current density of 3 Ag –1 ), and energy density of 8.34 Wh/kg at a power density of 395.15 Wkg –1 in 6 M KOH electrolyte in a 3-electrode experimental setup with a high working voltage of 1.55 V. Furthermore, when Fe 2 O 3 was doubled, 1:2 (AC:Fe 2 O 3 ), the electrochemical capacitive performance of the electrode twisted and deteriorated due to either the accumulation of Fe 2 O 3 particles within the composite or higher bulk resistance value of pure Fe 2 O 3 .","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42117211","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

Peanut Shells as an Environmentally Beneficial Sound-Absorbing Material 花生壳作为一种环保吸声材料

Journal of the Korean wood science and technology Pub Date : 2022-05-01 DOI: 10.5658/wood.2022.50.3.179

E. Jang

引用次数: 7

Study of Characterization of Activated Carbon from Coconut Shells on Various Particle Scales as Filler Agent in Composite Materials 椰子壳活性炭作为复合材料填充剂的表征研究

Journal of the Korean wood science and technology Pub Date : 2022-05-01 DOI: 10.5658/wood.2022.50.4.256

R. Dungani, S. S. Munawar, T. Karliati, J. Malik, P. Aditiawati, Sulistyono

引用次数: 2

Experimental Study of Bending and Bearing Strength of Parallel Strand Lumber (PSL) from Japanese Larch Veneer Strand 日本落叶松单板平行股材（PSL）的弯曲和承载强度试验研究

Journal of the Korean wood science and technology Pub Date : 2022-05-01 DOI: 10.5658/wood.2022.50.4.237

Seichang Oh

{"title":"Experimental Study of Bending and Bearing Strength of Parallel Strand\u0000 Lumber (PSL) from Japanese Larch Veneer Strand","authors":"Seichang Oh","doi":"10.5658/wood.2022.50.4.237","DOIUrl":"https://doi.org/10.5658/wood.2022.50.4.237","url":null,"abstract":"This study examined the structural performance of experimental parallel strand lumber (PSL) from a Larch veneer strand. The prototype of PSL from a Larch veneer strand was manufactured in the experimental laboratory and tested. The bending and dowel bearing strength were determined from the modulus of elasticity (MOE), modulus of rupture (MOR), and dowel bearing strength based on a 5% offset yield load. The test results indicated that the average MOR of PSL was higher than that of 2 × 4 dimension lumber, and the average MOE of PSL was lower than that of 2 × 4 dimension lumber. A linear relationship was observed between the MOR and MOE. The allowable bending stress of PSL was derived as specified in ASTM D2915 and compared with other research. The dowel bearing strength of PSL in parallel to the grain was approximately double that perpendicular to the grain of PSL. A comparison of several theoretical calculations based on each national code for the dowel bearing strength was conducted, and some theoretical equations produced results closer to the experimental results when it was parallel to the grain, but the difference was higher in the case perpendicular to the grain. The test results showed that PSL made with Japanese larch veneer strands appeared to be suitable for a raw material of structural composite lumber (SCL) appeared to be used as a raw material for SCL.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46515401","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: 4

Investigation of Wood Species and Conservation Status of Wooden Seated Amitabha Buddha Triad and Wooden Amitabha Buddha Altarpiece of Yongmunsa Temple, Yecheon, Korea (Treasure) 韩国野川永门寺木座阿弥陀三合会和木阿弥陀祭坛画的木材种类及保存状况调查（宝藏）

Journal of the Korean wood science and technology Pub Date : 2022-05-01 DOI: 10.5658/wood.2022.50.3.193

J. Choi, J. Park, S. Kim

{"title":"Investigation of Wood Species and Conservation Status of Wooden Seated Amitabha Buddha Triad and Wooden Amitabha Buddha Altarpiece of Yongmunsa Temple, Yecheon, Korea (Treasure)","authors":"J. Choi, J. Park, S. Kim","doi":"10.5658/wood.2022.50.3.193","DOIUrl":"https://doi.org/10.5658/wood.2022.50.3.193","url":null,"abstract":"The Wooden Seated Amitabha Buddha Triad and Altarpiece have not been the subjects of definitive species identification and scientific analysis. In this study, visual investigation, portable X-ray fluorescence (p-XRF), species identification, and lacquer layer observations were carried out to determine the original materials and conservation status. Cracks, exfoliation and discoloration were detected during the visual investigation. The p-XRF data indicated that chrome oxide green, malachite, gold, cadmium red, cinnabar, minium, hematite, lead white, ink stick (Carbon), and copper were used for pigments and the coronet accessory. Tilia spp., Abies spp., and Pinus spp. were identified from both the Buddha Triad and Altarpiece. Finally, lacquer layer analyses of the base layer, lacquer layer, orange pigment layer, and gold leaf layer observed modern synthetic pigments likely used in previous conservation. As the Korean Cultural Heritage Charter and the International Charter for the Conservation and Restoration of Monuments and Sites clearly state that objects of cultural heritage must be conserved using their original materials, future conservation of these objects should utilize the data obtained in this study to employ traditional materials. Furthermore, a deterioration map diagnosis can be applied together with the obtained analysis data to understand the conservation status of and inform an appropriate and authentic conservation treatment for the Buddha Triad and Altarpiece.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46541104","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: 3

Tomosynthesis Feasibility Study for Visualization of Interiors of Wood Columns Surrounded with Walls 木围墙柱室内可视化综合可行性研究

Journal of the Korean wood science and technology Pub Date : 2022-05-01 DOI: 10.5658/wood.2022.50.4.246

Jun Jae Lee, Chul-Ki Kim

{"title":"Tomosynthesis Feasibility Study for Visualization of Interiors of\u0000 Wood Columns Surrounded with Walls","authors":"Jun Jae Lee, Chul-Ki Kim","doi":"10.5658/wood.2022.50.4.246","DOIUrl":"https://doi.org/10.5658/wood.2022.50.4.246","url":null,"abstract":"The need for non-destructive testing and evaluation of Korean traditional wooden buildings is increasing because of their widespread deterioration. Among all types of deterioration, termite damage in wooden columns is the most difficult to detect with the naked eye because it starts inside the wood, and the initial deterioration is small. X-ray computed tomography (CT) is the best technology to investigate the inner state of wood that has less damage, but applying it to wooden columns between walls is challenging. Therefore, the feasibility of tomosynthesis, which is a method to reconstruct a coronal section of a subject with a few X-ray projections from a limited angle of rotation, was studied as an alternative to CT. Pine ( P. densiflora ) with three artificial holes was prepared as a specimen to evaluate the quality of reconstructed tomosynthesis images according to the different number of projections. The quality of the tomosynthesis images in the in-focus plane was evaluated using the contrast-to-noise ratios, while a vertical resolution between the images was assessed by determining the artificial spread function. The quality of the tomosynthesis image in the in-focus plane increased as the number of projections increased and then remained constant as the number of projections reached 21 or over. In the case of vertical resolution, there was no significant difference when 21 projections or more were used to reconstruct the images. A distinct difference between coronal section images was found when the distance was more than 10 mm from one plane to another plane.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45129671","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

Influence of Manufacturing Environment on Delamination of Mixed Cross Laminated Timber Using Polyurethane Adhesive 生产环境对聚氨酯胶粘剂复合交叉层压木材分层的影响

Journal of the Korean wood science and technology Pub Date : 2022-05-01 DOI: 10.5658/wood.2022.50.3.167

Dabin Song, Keonho Kim

{"title":"Influence of Manufacturing Environment on Delamination of Mixed Cross Laminated Timber Using Polyurethane Adhesive","authors":"Dabin Song, Keonho Kim","doi":"10.5658/wood.2022.50.3.167","DOIUrl":"https://doi.org/10.5658/wood.2022.50.3.167","url":null,"abstract":"To investigate the influence of manufacturing environment on bonding performance of mixed cross laminated wood (CLT) using polyurethane (PUR) adhesive, a boiling water soak delamination test according to the temperature and relative humidity was conducted. The 5-ply mixed CLT consisted of Japanese Larch for external and middle layer and yellow poplar for internal layer. The PUR adhesives with different opening times of 10 and 30 minutes were used. The mixed CLT was manufactured according to pressing times of PUR and manufacturing environments of summer and winter. In case of summer environment, the delamination rate of the mixed CLT with pressing time of 4 hours using a PUR adhesive with open time of 10 minutes met the requirements of KS F 2081. In case of winter environment, the delamination rate of the mixed CLT didn’t meet the requirements of KS standard. However, it was possible to confirm the effect of improving the adhesive performance by adjusting the pressing time according to the open time of the adhesive under the manufacturing conditions. The delamination rate of CLT with open time 30 minutes PUR, manufactured by indirect moisture supply methods was 11.2% better than direct moisture supply methods. As a result of delamination test in the same condition of relative humidity and adhesive, it was found that the temperature of manufacturing environment influences the adhesive performance.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45053831","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: 9

Peracetic Acid Treatment as an Effective Method to Protect Wood Discoloration by UV Light 过乙酸处理是防止紫外线照射下木材变色的有效方法

Journal of the Korean wood science and technology Pub Date : 2022-05-01 DOI: 10.5658/wood.2022.50.4.283

Kyoung-Chan Park, Byeongho Kim, Hanna Park, Se-Yeong Park

{"title":"Peracetic Acid Treatment as an Effective Method to Protect Wood\u0000 Discoloration by UV Light","authors":"Kyoung-Chan Park, Byeongho Kim, Hanna Park, Se-Yeong Park","doi":"10.5658/wood.2022.50.4.283","DOIUrl":"https://doi.org/10.5658/wood.2022.50.4.283","url":null,"abstract":"Wood has always been used for various day-to-day applications such as interior or exterior construction materials, and household products. However, it can undergo photodegradation and discoloration by environmental factors including ultraviolet (UV) light, and thus has shortened its service life. Bleaching or delignification of wood surfaces is a suitable solution to stabilize wood against weathering by UV because these techniques can alter or remove the chromophores in lignin, which is a main factor of wood discoloration. To improve the color stability of wood surface according to the lifespan, surface delignification was conducted using peracetic acid (PAA) and hydrogen peroxide (HP) on the woods of Larix kaempferi and Quercus mongolica . After the PAA treatment, L* increased considerably from 60 – 70 to 90 – 95. Furthermore, wood surface color did not change significantly after UV exposure. The color differences ( Δ E *) between before and after PPA treatment of wood showed the 4.8 – 12.2 of L. kaempferi , and 1.7 – 3.7 of Q. mongolica , respectively. The lignin-related peaks in Fourier transform infrared spectroscopy (FT-IR) spectra disappeared with increased duration of PAA treatment. These results confirmed that the lignin component was partially or completely removed after the PAA treatment; the color differences ( Δ E* ) clearly showed that there was a reduction in redness ( a* ) and yellowness ( b* ), and an increase in lightness ( L* ) owing to the removal of lignin. Based on these results, this study demonstrated that the partial removal of lignin from wood surfaces is a fundamental method for resolving photo-degradation.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45144614","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

Characterization of NAD-Dependent Formate Dehydrogenase from Trametes versicolor Using a Cell-Free Protein Expression System 利用无细胞蛋白质表达系统鉴定云芝NAD依赖性甲酸脱氢酶

Journal of the Korean wood science and technology Pub Date : 2022-05-01 DOI: 10.5658/wood.2022.50.3.159

Su-Yeon Lee, Seokyoon Jang, Soo-Min Lee

引用次数: 1