Wood Research最新文献_第9页

Study on lamb wave propagation characteristics along the grain of thin wood sheet 兰姆波沿薄木板纹理传播特性的研究

IF 1.3 4区农林科学

Wood Research Pub Date : 2021-03-08 DOI: 10.37763/WR.1336-4561/66.1.141152

Wang Minghua, Li Ming, Tingting Deng, Saiyin Fang, Liao Xiaosong, L. Fei

{"title":"Study on lamb wave propagation characteristics along the grain of thin wood sheet","authors":"Wang Minghua, Li Ming, Tingting Deng, Saiyin Fang, Liao Xiaosong, L. Fei","doi":"10.37763/WR.1336-4561/66.1.141152","DOIUrl":"https://doi.org/10.37763/WR.1336-4561/66.1.141152","url":null,"abstract":"Through the time-frequency analysis of the propagation waveform of the acoustic emission (AE) signal propagating in the thin sheet of Pinus sylvestris var. mongolica, the propagation characteristics of the stress wave when propagating as a lamb wave was studied. An AE source was generated on the surface of the specimen, the discrete wavelet transform method was used to achieve AE signal de-noising and reconstruct the waveform of the AE signal. On this basis, the time difference positioning method was used to calculate the propagation velocity of lamb waves, and compared with the propagation characteristics of lamb waves in the metal specimen. The results show that the high-frequency mode of lamb waves attenuated sharply as they propagate in the thin wood sheet, indicating that the microstructure of wood has a significant low-pass characteristic for lamb waves. The average attenuation rates of lamb waves in metal and thin wood sheet were 87.1% and 75.7%, and the velocity was 4447.0 m.s-1 and 1186.3 m.s-1, respectively. This shows that AE signals can travel longer distances in the thin wood sheet, but the propagation velocity is significantly reduced.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":"66 1","pages":"141-152"},"PeriodicalIF":1.3,"publicationDate":"2021-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43317368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Effect of silica on alkaline bagasse cellulose and softwood cellulose 二氧化硅对碱性蔗渣纤维素和软木纤维素的影响

IF 1.3 4区农林科学

Wood Research Pub Date : 2021-03-08 DOI: 10.37763/WR.1336-4561/66.1.8594

S. Mohomane, S. Motloung, L. Koao, T. Motaung

{"title":"Effect of silica on alkaline bagasse cellulose and softwood cellulose","authors":"S. Mohomane, S. Motloung, L. Koao, T. Motaung","doi":"10.37763/WR.1336-4561/66.1.8594","DOIUrl":"https://doi.org/10.37763/WR.1336-4561/66.1.8594","url":null,"abstract":"This study investigates the effect of silica on sugarcane bagasse (SCB) and softwood (SW) cellulose. Cellulose was extracted from raw SCB and SW chips using a three-step process, namely thermal pre-treatment, alkaline treatment and bleaching treatment. Alkali treated cellulose was then subjected to silica surface modification using the solvent exchange method. The effect of silica modification on SCB and SW cellulos was investigated using X-ray diffractions analysis (XRD), Fourier transform infrared (FTIR) spectroscopy and optical microscope (OPM) techniques. Both the FTIR and XRD results confirm successful extraction of cellulose from both raw fibers and addition of silane functional groups in the cellulose surface. XRD patterns of all samples revealed typical spectra for natural fibers corresponding to crystalline peaks of cellulose and undissolved amorphous hemicellulose respectively. SCB and SW showed similar increasing patterns of crystallinity with nanosilica surface modification. The surface morphology results showed that both SCB and SW cellulose modified with silica were swollen and displayed small particles agglomerating on the surface of the fibers. The solvent exchange method proved to be a successful method for modifying SCB and SW cellulose with nanosilica. It also proved to be cost-efficient and time-efficient.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":"66 1","pages":"85-94"},"PeriodicalIF":1.3,"publicationDate":"2021-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46312748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Experimental and numerical studies on mechanical behaviors of beech wood under compressive and tensile states 山毛榉木材在压缩和拉伸状态下力学行为的实验和数值研究

IF 1.3 4区农林科学

Wood Research Pub Date : 2021-03-08 DOI: 10.37763/WR.1336-4561/66.1.2738

Wengang Hu, Bingrui Chen, Tianxing Zhang

{"title":"Experimental and numerical studies on mechanical behaviors of beech wood under compressive and tensile states","authors":"Wengang Hu, Bingrui Chen, Tianxing Zhang","doi":"10.37763/WR.1336-4561/66.1.2738","DOIUrl":"https://doi.org/10.37763/WR.1336-4561/66.1.2738","url":null,"abstract":"Effect of loading type (compression and tension) on mechanical properties, including elastic constants, yield strength and ultimate strength of beech (Fagus orientalis) wood were studied based on experimental and numerical methods. The mechanical behaviors of beech wood in compressive and tensile states were simulated by finite element method (FEM) using mechanical parameters measured in an experiment. The results showed that the effect of loading types on mechanical properties of beech was statistically significant. The elastic moduli measured in tension were all bigger than those in compression, but the Poisson’s ratios determined in compression were bigger than those in tension. In compressive state, the yield and ultimate strengths of beech in longitudinal grain orientation were all smaller than those measured in tensile state, while the yield and ultimate strengths of beech in radial and tangential directions were higher than those of longitudinal direction. The results of the FEM in compression and tension were all well consistent with those measured by experiments respectively, and the average errors were all within 13.69%. As a result, the finite element models proposed in this study can predict the mechanical behaviors of wood in tensile and compressive states.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2021-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44935813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Comparison of thermal transfer and inkjet printing of UHF RFID tag antennas on paper substrates UHF RFID标签天线在纸基板上的热转印和喷墨打印比较

IF 1.3 4区农林科学

Wood Research Pub Date : 2021-03-07 DOI: 10.37763/WR.1336-4561/66.1.7184

J. Gigac, M. Fišerová, S. Hegyi

{"title":"Comparison of thermal transfer and inkjet printing of UHF RFID tag antennas on paper substrates","authors":"J. Gigac, M. Fišerová, S. Hegyi","doi":"10.37763/WR.1336-4561/66.1.7184","DOIUrl":"https://doi.org/10.37763/WR.1336-4561/66.1.7184","url":null,"abstract":"UHF RFID printed antennas on conventional and experimentally coated papers by thermal transfer and inkjet technique were not conductive due to high surface roughness. Reducing the surface roughness of paper and hence the electrical resistance of the antennas printed by thermal transfer and inkjet printing was achieved by coating and subsequent calendering process. Papers for thermal transfer and inkjet printed of aluminum and silver antennas were prepared by coating with top functional coating, whose main component was pigment precipitated calcium carbonate with addition of polyvinyl alcohol, cationic polymer PDADMAC and glyoxal. The desired quality of inkjet-printed silver antennas was achieved by using coated paper with a polyvinyl alcohol barrier layer and a top functional hydrophilic layer. Silver nanoparticles of inkjet ink require a sintering process to obtain a conductive printed trace. The microstructure and thickness of antennas printed by thermal transfer and inkjet technique were compared. Thermal transfer printing created a more homogeneous antenna with greater sharpness of drawing compared to inkjet printing.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":"66 1","pages":"71-84"},"PeriodicalIF":1.3,"publicationDate":"2021-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45441203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Box-Behnken design for process parameters optimalization of bamboo-based composite panel manufacturing. 竹基复合板制造工艺参数优化的Box-Behnken设计。

IF 1.3 4区农林科学

Wood Research Pub Date : 2020-12-18 DOI: 10.37763/wr.1336-4561/65.6.9891000

Quan Li, Ren-Bao Liu, Xiaoqian Chen, Hui Lin

引用次数: 1

Bending moment resistances of L-shaped furniture frame joints under tension and compression loadings. l型家具框架节点在拉力和压缩载荷下的弯矩抗力。

IF 1.3 4区农林科学

Wood Research Pub Date : 2020-12-18 DOI: 10.37763/wr.1336-4561/65.6.975988

Selçuk Demirci, Harun Diler, Ali Kasal, Y. Z. Erdil

引用次数: 2

Effect of heat treatment and wax impregnation on dimensional stability of Pterocarpus macrocarpus wood. 热处理和蜡浸渍对紫檀木材尺寸稳定性的影响。