Journal of the Korean wood science and technology最新文献

{"title":"Surface Discoloration of Ultraviolet (UV)-Irradiated\u0000 Phyllostachys bambusoides Bamboo","authors":"Hyoung-Woo Lee, Eun-Ju Lee, Y. Shin, H. Jo, Dae-Yeon Song","doi":"10.5658/wood.2023.51.3.173","DOIUrl":"https://doi.org/10.5658/wood.2023.51.3.173","url":null,"abstract":"Color is an attribute of visual perception and can be an important factor that affects the preference of customers toward bamboo and wood products. Solar radiation can discolor bamboo surfaces and initiate cracking. The purpose of this study is to investigate the effects of an ultraviolet (UV)-protective coating on the photodiscoloration of untreated and heat-treated Phyllostachys bambusoides bamboo surfaces. Artificial UVA radiators are set at a UVA irradiance of 2,000 W/m 2 to accelerate the aging of the outer surfaces of hot-air-dried and heat-treated bamboo samples. Half of the samples are coated with transparent UV-protective paint. As the UVA radiation progresses, the discoloration prevention efficiency ( DPE ) of the UV-protective coating on all samples decreases gradually. The DPE s of the hot-air-dried samples are estimated to be 31.4% and 18.8% after 21 and 72 hours of artificial UVA radiation, respectively. The heat-treated samples exhibit similar trends (29.0% after 21 hours and 10.3% after 72 hours). Recoating the UV-protective paint periodically every six months is expected to minimize the discoloration of the bamboo’s outer surface.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45459499","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":"Stain Fungi and Discoloration Control on Rubberwood (Hevea\u0000 brasiliensis Muell. Arg.) by Vacuum-Pressure Treatment with\u0000 Catechin from Gambir (Uncaria gambir Roxb.)","authors":"D. Nandika, E. N. Herliyana, A. Arinana, Y. Hadi, M. Rahman","doi":"10.5658/wood.2023.51.3.183","DOIUrl":"https://doi.org/10.5658/wood.2023.51.3.183","url":null,"abstract":"Recently, the morphological and molecular features of five stain fungi infecting rubberwood ( Hevea brasiliensis ), namely Paecilomyces maximus , Paecilomyces formosus , Penicillium crustosum , Paecilomyces lecythidis and Aspergillus chevalieri , have been studied. Prior to this study, the authors revealed that catechin from gambir ( Uncaria gambir ) could inhibit the growth of the white-rot fungus Schizophyllum commune , and it was important to determine the bioactivity of the aforementioned agent against A. chevalieri . The efficacy of the biocidal agent was examined using a laboratory wooden block test. Rubberwood blocks, 8 mm in thickness, 20 mm in width, and 30 mm in length, were impregnated with catechin solution at concentrations of 6%, 9%, 12%, and 15% (w/v) using the vacuum-pressure method, and their bioactivity was monitored over three weeks through visual and scanning electron microscope assessment of fungal growth as well as the discoloration intensity of the wood samples. The results showed that catechin treatment increased the resistance of wood samples to A. chevalieri . Overall, the higher the catechin concentration, the lower the fungal growth. The lowest fungal growth was observed in the wood samples treated with 12% and 15% catechin (score of 0), demonstrating no discoloration. In contrast, the fungal growth score of the untreated wood samples reached 4, indicating severe discoloration. Catechins appear to be adequate biofungicides against stain fungi in rubberwood.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43637077","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":"Anti-Termite Activity of Azadirachta excelsa Seed\u0000 Kernel and Its Isolated Compound against Coptotermes\u0000 curvignathus","authors":"M. Adfa, Khafit Wiradimafan, Ricky Febri Pratama, A. Sanjaya, D. A. Triawan, S. Yudha S., Masayuki Ninomiya, M. Rafi, M. Koketsu","doi":"10.5658/wood.2023.51.3.157","DOIUrl":"https://doi.org/10.5658/wood.2023.51.3.157","url":null,"abstract":"Azadirachta excelsa , is a plant belonging to the same genus as Indian neem ( Azadirachta indica ), and its use as a pesticide is reported by few studies. Despite being a different species, it is expected to have the same biopesticide potential as A. indica . Therefore, this study aims to investigate the anti-termite activity of n -hexane and methanol extracts of A. excelsa seed kernel at various concentrations against Coptotermes curvignathus . The methanol extract demonstrated greater termicidal activity than n -hexane at doses test of 2%, 4%, and 8%. It also showed 100% termite mortality on the third day of administering the 8% dose. According to the gas chromatography with mass spectrometry data, the putative main components of the n -hexane extract were hexadecanoic acid, ethyl ester (18.99%), 9,12-octadecadienoic acid (Z,Z)- (16.31%), and 9-octadecenal (16.23%). In contrast, the principal constituents of methanol extract were patchouli alcohol (28.1%), delta-guaiene (15.15%), and alpha-guaiene (11.93%). Furthermore, limonoids profiling of A. excelsa methanol extract was determined using Ultrahigh-performance liquid chromatography coupled with quadrupole-Orbitrap high-resolution mass spectrometry. The number of limonoids identified tentatively was fifteen, such as 6-deacetylnimbin, nimbolidin C, nimbolide, 6-acetylnimbandiol, 6-deacetylnimbinene, salannol, 28-deoxonimbolide, gedunin, nimbandiol, epoxyazadiradione, azadirone, 2',3'-dihydrosalannin, marrangin, nimbocinol, and azadirachtin. They were the same as those reported in the seed and leaves of A. indica , but its largest component in A. excelsa was 6-deacetylnimbin. As a result, the presence of these compounds may be responsible for the anti-termite activity of A. excelsa seed kernel extract. Additionally, column chromatography of methanol extract yielded 6-deacetylnimbin, which was found to be antifeedant and termiticide against C. curvignathus .","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42051783","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":"Bending Properties of Parallel Chord Truss with Steel-Web\u0000 Members","authors":"Hyun-Yong Lee, S. Jang","doi":"10.5658/wood.2023.51.3.197","DOIUrl":"https://doi.org/10.5658/wood.2023.51.3.197","url":null,"abstract":"A truss is a structure in which the members are connected and arranged such that they are primarily subjected to axial loading. A truss has the advantage that it can be used for a longer span because the structure distributes the applied force to its members well, and the load is transmitted only in the axial direction of the members. Trusses manufactured using timber have more advantages than those made of other materials. In this study, the properties of parallel chord trusses composed of timber chord and steel-web members were evaluated. We constructed truss specimens with various lengths by using upper and lower chords of 2 × 4 inch spruce-pine-fir lumber and steel-web members manufactured by S and P companies. The specimens were tested in accordance with KS F 2150. The test results showed that the load at the deflection limit and the deflection limit itself increased from L/180 to L/360 regardless of the length of the specimens. For specimens of the same length, the load at the deflection limit increased as the height of the parallel timber chord truss specimens increased from 200 to 300 mm. Successive installations of the steel-web members (SST) showed almost 2 times the load at each deflection limit compared to that of SAT specimens (alternate installation of the steel-web members). When comparing the three load– deflection limits in terms of the manufacturer of the steel-web members, the load at each deflection limit for SST specimens was higher than that for PST specimens.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46791190","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":"Wood Physical and Mechanical Properties of Clonal Teak\u0000 (Tectona grandis) Stands Under Different Thinning and\u0000 Pruning Intensity Levels Planted in Java, Indonesia","authors":"Gama Widya Seta, F. Hidayati, Widiyatno, M. Na’iem","doi":"10.5658/wood.2023.51.2.109","DOIUrl":"https://doi.org/10.5658/wood.2023.51.2.109","url":null,"abstract":"The objective of this study was to reveal the impact of thinning and pruning regimes on the physical and mechanical properties of clonal teak wood planted in Java. In this study, a 15-year-old clonal teak plantation was carried out and the obtained data were evaluated with analysis of variance (ANOVA). The results showed that different thinning intensities had a significant impact on the alteration of heartwood volume development ( F = 25.63; p < 0.0001). Meanwhile, the impact of different thinning treatments in several physical properties depends on the pruning treatment levels [moisture content ( F = 12.18, p < 0.0001); tangential shrinkage ( F = 15.60, p < 0.0001); T/R ratio ( F = 7.17, p < 0.0001); and volumetric shrinkage ( F = 10.81, p < 0.0001)]. However, different thinning intensities had no significant impact on wood basic density alteration ( F = 0.72, p = 0.486), while pruning intensities affect the differences between radial ( F = 3.52, p = 0.030) and volumetric shrinkage ( F = 3.13, p = 0.044). In mechanical properties, thinning intensity levels did not promote any significant differences [modulus of elasticity ( F = 1.41, p = 0.248); modulus of rupture ( F = 0.94, p = 0.392); compressive strength parallel to grain ( F = 0.21, p = 0.813); and compressive strength perpendicular to the grain ( F = 0.41, p = 0.669)]. Meanwhile, different pruning treatments and combination treatments were not significantly altered all mechanical properties. These results indicated that the thinning and pruning regimes can enhance the mechanical properties without having a serious alteration in the physical properties of clonal teak wood.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49204631","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":"Synergistic Growth Inhibition of Herbal Plant Extract Combinations\u0000 against Candida albicans","authors":"J. Yoon, Tae-Jong Kim","doi":"10.5658/wood.2023.51.2.145","DOIUrl":"https://doi.org/10.5658/wood.2023.51.2.145","url":null,"abstract":"","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44077682","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":"Mechanical Properties and Density Profile of Ceramics Manufactured\u0000 from a Board Mixed with Sawdust and Mandarin Peels","authors":"Jung-Woo Hwang, Seung-Won Oh","doi":"10.5658/wood.2023.51.2.98","DOIUrl":"https://doi.org/10.5658/wood.2023.51.2.98","url":null,"abstract":"","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43682325","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":"Performance of Six-Layered Cross Laminated Timber of Fast-Growing\u0000 Species Glued with Tannin Resorcinol Formaldehyde","authors":"D. R. Trisatya, A. Santoso, A. Abdurrachman, D. Prastiwi","doi":"10.5658/wood.2023.51.2.81","DOIUrl":"https://doi.org/10.5658/wood.2023.51.2.81","url":null,"abstract":"The aim of this study were to evaluate tannin resorcinol formaldehyde (TRF) for the preparation of cross-laminated timbers (CLTs) made from fast-growing tree species and to analyze the physical and mechanical properties of CLTs. TRF copolymer resin was prepared by using the bark extracts of Swietenia mahagoni (L.) Jacq. It was observed that the TRF adhesive possessed less solid content (23.59%), high viscosity (11.35 poise), and high pH values (10.0) compared to the standard phenol resorcinol formaldehyde. The TRF adhesive was applied to produce CLTs with the addition of 15% tapioca and flour as an extender. The six-layered CLTs were produced from sengon ( Falcataria moluccana Miq.), jabon [ Anthocephalus cadamba (Roxb) Miq.], coconut ( Cocos nucifera L.), and the combination of coconut-jabon and coconut-sengon wood. The analysis of variance revealed that the layer composition of CLT significantly affected the physical and mechanical properties of the beam. While the modulus of rupture met the standard, the moisture content and modulus of elasticity values did not fulfill JAS 1152-2007. All of the CLTs produced in this study demonstrated low formaldehyde emission, ranging from 0.001 mg/L to 0.003 mg/L, thereby satisfying the JAS 1152 for structural glue laminated timber.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70827882","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":"Improvement of Dimensional Stability of Tropical Light-Wood\u0000 Ceiba pentandra (L) by Combined Alkali Treatment and\u0000 Densification","authors":"D. S. Nawawi, Andita Maria, Rizal Firdaus, I. Rahayu, A. Fatrawana, F. Pramatana, Pamona Silvia Sinaga, W. Fatriasari","doi":"10.5658/wood.2023.51.2.133","DOIUrl":"https://doi.org/10.5658/wood.2023.51.2.133","url":null,"abstract":"Densification is an effective method for improving the physical and mechanical properties of low-density wood.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46718851","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":"Lacquer Techniques in the Late Joseon Dynasty","authors":"J. Park, J. Choi, U. Lee, Minji Kang, Soochul Kim","doi":"10.5658/wood.2023.51.2.69","DOIUrl":"https://doi.org/10.5658/wood.2023.51.2.69","url":null,"abstract":"","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49394577","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}