Journal of the Korean wood science and technology最新文献_第10页

Evaluation of Bearing Strength of Self-Tapping Screws according to the Grain Direction of Domestic Pinus densiflora 根据国产赤松的粒径方向评价自攻螺钉的承载力

Journal of the Korean wood science and technology Pub Date : 2022-01-01 DOI: 10.5658/wood.2022.50.1.1

In-Hwan Lee, Keon-Ho Kim, K. Shim

{"title":"Evaluation of Bearing Strength of Self-Tapping Screws according to the Grain Direction of Domestic Pinus densiflora","authors":"In-Hwan Lee, Keon-Ho Kim, K. Shim","doi":"10.5658/wood.2022.50.1.1","DOIUrl":"https://doi.org/10.5658/wood.2022.50.1.1","url":null,"abstract":"To evaluate the bearing strength of red pine cross-laminated timber (CLT) with self-tapping screw (STS), which is widely used as a fastener for connection in CLT building, the bearing test was conducted. Accoring to the STS’s diameters (8, 10, 12 mm), the bearing test specimens with half hole were manufactured. Bearing strength was compared and reviewed in consideration of the configuration in STS and the loading direction to the grain of red pine. As a result of the bearing test on the STS’s diameter, the yield bearing load increases as the larger diameter of the STS in all directions of the red pine. The bearing strength of the thread part (thread + tip) was higher than the shank part (shank + shank cutter). In compared with the directions to the grain of red pine, the bearing strength of the cross section parallel to the loading direction was the highest, and the tangent section was the lowest bearing strength. The average bearing strength of the loading direction in parallel to the grain was 23.43 MPa, which was about 45% higher than the average 16.16 MPa in perpendicular to the grain. The predicted bearing strength calculated by Eurocode (EN) and Korean Building Code (KBC)’s equation was lower than the experimental value. It is nessesary to propose the new equations of bearing strength reflected the configuration information of STS.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43247830","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: 6

Synergistic Antifungal Activity of Phellodendri Cortex and Magnoliae Cortex against Candida albicans 黄柏皮和木兰皮对白色念珠菌的协同抗真菌活性

Journal of the Korean wood science and technology Pub Date : 2022-01-01 DOI: 10.5658/wood.2022.50.1.12

Hyunjeong Na, Tae-Jong Kim

{"title":"Synergistic Antifungal Activity of Phellodendri Cortex and Magnoliae Cortex against Candida albicans","authors":"Hyunjeong Na, Tae-Jong Kim","doi":"10.5658/wood.2022.50.1.12","DOIUrl":"https://doi.org/10.5658/wood.2022.50.1.12","url":null,"abstract":"Many studies on plant extracts have been reported for the treatment of candidiasis caused by Candida albicans, a representative fungal infection. This study demonstrates the synergistic antifungal activity of the combination of Phellodendri Cortex and Magnoliae Cortex, previously reported to have antifungal efficacy. Considering the antifungal efficacy and the separation of the active constituents, berberine and magnolol, hot water extraction and carbon dioxide supercritical extraction were selected for Phellodendri Cortex and Magnoliae Cortex, respectively. A combination of 0.55 g/L hot water extract of Phellodendri Cortex and 0.59 g/L carbon dioxide supercritical extract of Magnoliae Cortex showed synergistic antifungal activity. The synergistic antifungal activity of 160 μM berberine and 100 μM magnolol, which are representative antifungal compounds of Phellodendri Cortex and Magnoliae Cortex, respectively, contributes to the synergistic antifungal effect of their extracts. The additive decrease in cellular ergosterol level and the increased antifungal efficacy by extracellular ergosterol suggest that disruption of the biological function of ergosterol in the cell membrane is not responsible for the synergistic antifungal activity of berberine and magnolol. Synergistic cellular release of chromosomal DNA upon mixing berberine and magnolol indicates that disruption of the cellular structure is responsible for the synergistic antifungal effect of berberine and magnolol.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44752577","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

Furfurylation Effects on Discoloration and Physical-Mechanical Properties of Wood from Tropical Plantation Forests 呋喃化对热带人工林木材变色和物理力学性能的影响

Journal of the Korean wood science and technology Pub Date : 2022-01-01 DOI: 10.5658/wood.2022.50.1.46

Y. Hadi, E. N. Herliyana, G. Pari, R. Pari, I. B. Abdillah

引用次数: 13

Effect of Steam Explosion Condition on the Improvement of Physicochemical Properties of Pine Chips for Feed Additives 蒸汽爆炸条件对饲料添加剂松片理化性能改善的影响

Journal of the Korean wood science and technology Pub Date : 2022-01-01 DOI: 10.5658/wood.2022.50.1.59

J. Jung, S. Ha, Jae-Kyung Yang

引用次数: 2

Dyeing and Color Fastness Properties of Natural Dyed Actual Size Hanji 天然染色实际尺寸汉纸的染色及色牢度性能

Journal of the Korean wood science and technology Pub Date : 2022-01-01 DOI: 10.5658/wood.2022.50.1.31

JeongKwan Roh, Hyun-Jin Jo

{"title":"Dyeing and Color Fastness Properties of Natural Dyed Actual Size Hanji","authors":"JeongKwan Roh, Hyun-Jin Jo","doi":"10.5658/wood.2022.50.1.31","DOIUrl":"https://doi.org/10.5658/wood.2022.50.1.31","url":null,"abstract":"After manufacturing the natural dyed actual size Hanji using 11 kinds of plant natural dyeing materials and 2 kinds of animal natural dyeing materials, the color characteristics and color change and color fastness after post-mordanting were compared and discussed. The hues of 13 types of natural dyed Hanji were black, PB, and RP, each with 1 type, YP with 3 types, and Y with 7 types. Among the natural dyeing materials, Chinese ink, indigo and Lac showed high color yield and color difference, and violet-root cromwell and gardenia seeds showed low color yield. The color fastness of Hanji dyed with turpentine diluted Ottchil, Pagoda tree seeds, Chinese ink and indigo was excellent, while that of gardenia seeds and violet-root cromwell were very poor. After post-mordanting of natural dyed Hanji with Al, Cu, and Fe mordants, the hue changes were show up the Alnus firma, clove, lac and cochineal. In addition, the color difference was very diverse and was overall the most biggest due to Fe mordant. After 72 hr. of UV irradiation on post-mordanting natural dyed Hanji, hue change was observed in 3 types and color fastness was improved in 8 types by post-mordanting. The Hue and color fastness are significantly different depending on the type of natural dying materials and post-mordants. Therefore, when dyeing Hanji with natural dyes, it is necessary to dye with sufficient knowledges and informations about the desired color and fastness.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43678210","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

Analysis of Anatomical Characteristics for Wood Species Identification of Commercial Plywood in Korea 韩国商品胶合板树种鉴定的解剖学特征分析

Journal of the Korean wood science and technology Pub Date : 2021-11-01 DOI: 10.5658/wood.2021.49.6.574

Hyun Mi Lee, Woo-Seok Jeon, Jei-Wan Lee

{"title":"Analysis of Anatomical Characteristics for Wood Species Identification of Commercial Plywood in Korea","authors":"Hyun Mi Lee, Woo-Seok Jeon, Jei-Wan Lee","doi":"10.5658/wood.2021.49.6.574","DOIUrl":"https://doi.org/10.5658/wood.2021.49.6.574","url":null,"abstract":"1) International efforts to prevent illegally logged wood are expanding around the world. The “Legal Wood Trade Promotion System” was enacted in Korea in 2019 to strengthen the legal import and distribution of commercial wood in Korea. Since then, this system has promoted and ensured that the imported wood and wood products are legal with respect to the country of origin, wood species, and harvested area. As verification methods, DNA analysis technology and anatomical analysis using a microscope are mainly used in conjunction. Therefore, in this study, wood species of plywood were identified by analyzing the anatomical characteristics of various wood products for the first time. Douglas fir (Pseudotsuga menziesii (Mirb.) Franco.) and larch (Larix kaempferi (Lamb.) Carriere) plywoods (7, 9 ply) were obtained from four companies that supply plywood in Korea. After cutting each company's plywood to a size of about 1 cm 3 , the layers from top to bottom were separated into single layers, and three sections were observed using an optical microscope. The results revealed that the plywood was composed of a mixture of softwood and hardwood wood species, pine wood species, poplar wood species, or a mixture of larch and pine wood species. Identification of wood species using microscopy is important and can enable the scientific analysis and verification of various wood products, including plywood, imported from countries where the likelihood of indiscriminate distribution of illegal wood and illegal logging is high.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42646339","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: 8

Preparation of Flame Retardant and Antibacterial Wood with Composite Membrane Coating 复合膜涂层阻燃抗菌木材的制备

Journal of the Korean wood science and technology Pub Date : 2021-11-01 DOI: 10.5658/wood.2021.49.6.658

Junnan Xu, Yang Liu, Mingyu Wen, H. Park, Jiajie Zhu, Yu-nan Liu

{"title":"Preparation of Flame Retardant and Antibacterial Wood with Composite Membrane Coating","authors":"Junnan Xu, Yang Liu, Mingyu Wen, H. Park, Jiajie Zhu, Yu-nan Liu","doi":"10.5658/wood.2021.49.6.658","DOIUrl":"https://doi.org/10.5658/wood.2021.49.6.658","url":null,"abstract":"1) A novel flame retardant and antibacterial composite membrane coating for wood surfaces was prepared by adding POSS-based phosphorous nitrogen flame retardant (later referred to as NH2-POSS) and silver nanoparticles (Ag NPs) to chitosan (CS). The effects of NH2-POSS content (mass fractions of CS 0%, 0.5%, 1%, 3%, 5%, and 7%) on the structure and properties of the composite membrane coating on wood were investigated. The composite film was prepared by the method of blending and ducting. Contact angle, tensile property and antibacterial effects of the composite film were measured, and infrared spectroscopy was used. The results show that the addition of NH2-POSS can not only improve the toughness of the membrane, but also the flame retardancy of the membrane, which improves the application of the membrane in wood products. However, with the addition of NH2-POSS, the transparency of the composite membrane was weakened. The inhibitory effect of the composite membrane on the growth of Escherichia coli was enhanced with the increase in Ag NPs. This research provides a foundation for the application of functional wood.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44851187","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

Residual Strength Estimation of Decayed Wood by Insect Damage through in Situ Screw Withdrawal Strength and Compression Parallel to the Grain Related to Density 通过与密度相关的平行颗粒的螺杆抽拔强度和压缩量估算虫蛀木材的残余强度

Journal of the Korean wood science and technology Pub Date : 2021-11-01 DOI: 10.5658/wood.2021.49.6.541

Sei-Chang Oh

引用次数: 2

Effects of Hot-Air Heat Treatment on the Surface Color of Phyllostachys bambusoides Bamboo 热空气热处理对毛竹表面颜色的影响

Journal of the Korean wood science and technology Pub Date : 2021-11-01 DOI: 10.5658/wood.2021.49.6.566

Hyoung-Woo Lee, Eun-Ju Lee

引用次数: 3

Species Identification and Tree-Ring Dating of the Wooden Elements Used in Juheulgwan of Joryeong (Gate No.1), Mungyeong, Korea 韩国闻庆卓荣(1号门)居黑关木器的种类鉴定和年轮测年

Journal of the Korean wood science and technology Pub Date : 2021-11-01 DOI: 10.5658/wood.2021.49.6.550

Kwang-Hee Lee, C. Park, S. Kim

引用次数: 3