Wood Research最新文献_第10页

Wood properties comparation of Cedrela odorata from trees in agroforestry and in pure plantation 农林业和纯人工林中香柏木的木材特性比较

IF 1.3 4区农林科学

Wood Research Pub Date : 2021-03-08 DOI: 10.37763/WR.1336-4561/66.1.117128

Beatriz Segura-Elizondo, R. Moya

{"title":"Wood properties comparation of Cedrela odorata from trees in agroforestry and in pure plantation","authors":"Beatriz Segura-Elizondo, R. Moya","doi":"10.37763/WR.1336-4561/66.1.117128","DOIUrl":"https://doi.org/10.37763/WR.1336-4561/66.1.117128","url":null,"abstract":"The aim of this work was to compare the general, physical, mechanical, chemical and energy properties of the wood from Cedrela odorata trees growing in two agroforestry condition (tree-agroforestry) with Theobroma cacao (9 and 10 years old), with a ten-year-old C. odorata tree growing in pure plantation (tree-plantation). The results showed that there growing in agroforestry presented higher heartwood diameter (6.7 to 7.6 cm) and heartwood (approx. 17%) and lower bark (12-13%) and sapwood (69-70%) percentages than trees in pure plantation. In addition, this tendency was observed through different heights of the tree. Moreover, wood from 9-tree-agroforestry presented highest specific gravity and volume shrinkage. Then wood from this growing condition presented highest strength in axial hardness and flexure relative, and extractives in cold water and ethanol-toluene. No differences were observed between the energy properties. In general, wood from trees in agroforestry present better properties than the trees growing in pure plantation. According with these results, the potential of agroforestry systems relative to pure plantations, as regards to differences in tree growth produced by crop fertilization, pruning and other management measures to which the agricultural crop is subjected, which can give the wood qualities different from those found at earlier ages.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45187282","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: 0

Effect of hot pressing modification on surface properties of rubberwood (Hevea brasiliensis) 热压改性对橡胶木表面性能的影响

IF 1.3 4区农林科学

Wood Research Pub Date : 2021-03-08 DOI: 10.37763/WR.1336-4561/66.1.129140

Zhipeng Zhu, Dengyun Tu, Ziwei Chen, Chen Chuanfu, Qiangfang Zhou

引用次数: 3

Thermogravimetric analysis, differential scanning calorimetry and time-to-ignition of wood materials treated with water glass flame retardants 用水玻璃阻燃剂处理的木质材料的热重分析、差示扫描量热法和点火时间

IF 1.3 4区农林科学

Wood Research Pub Date : 2021-03-08 DOI: 10.37763/WR.1336-4561/66.1.1526

Juraj Jancík, L. Osvaldová, F. Markert

引用次数: 1

Effects of light thermal treatments on the color, hygroscopity and dimensional stability of wood 光热处理对木材颜色、吸湿性和尺寸稳定性的影响

IF 1.3 4区农林科学

Wood Research Pub Date : 2021-03-08 DOI: 10.37763/WR.1336-4561/66.1.95104

X. Y. Liu, Xinwei Tu, Mihaela Liu

引用次数: 13

Synthesis and characterization of resol type phenol-formaldehyde resin improved by SiO2-Np SiO2-Np改性甲阶酚醛树脂的合成与表征

IF 1.3 4区农林科学

Wood Research Pub Date : 2021-03-08 DOI: 10.37763/WR.1336-4561/66.1.161169

G. Özbay, Erkan Sami Kokten, A. Özçifçi

引用次数: 3

The concentration of selected heavy metals in poplar wood biomass and liquid fraction obtained after high temperature pretreatment 杨木生物量和高温预处理液中重金属的浓度

IF 1.3 4区农林科学

Wood Research Pub Date : 2021-03-08 DOI: 10.37763/WR.1336-4561/66.1.3948

D. Krutul, J. Szadkowski, A. Antczak, M. Drożdżek, A. Radomski, S. Karpiński

{"title":"The concentration of selected heavy metals in poplar wood biomass and liquid fraction obtained after high temperature pretreatment","authors":"D. Krutul, J. Szadkowski, A. Antczak, M. Drożdżek, A. Radomski, S. Karpiński","doi":"10.37763/WR.1336-4561/66.1.3948","DOIUrl":"https://doi.org/10.37763/WR.1336-4561/66.1.3948","url":null,"abstract":"The concentration of selected heavy metals: chromium (Cr), manganese (Mn), iron (Fe), nickel (Ni), copper (Cu) and zinc (Zn) in 5-year-old wood of Populus trichocarpa before and after steam explosion (SE) and liquid hot water (LHW) pretreatments was studied. The concentration of the above heavy metals in the liquid fraction obtained after pretreatments was also studied. The studied problem of heavy metals in lignocellulosic biomass is an interesting and important issue in the context of bioethanol production technology. An X-ray f luorescence spectrometer (XRF) was used to analyse the concentration of heavy metals. The change of concentration of the tested elements in wood biomass after pretreatment was small (except for iron). On the other hand, the average concentration of iron in wood biomass of a 5-year-old Populus trichocarpa, after SE and LHW with duration of the pretreatments 15 and 60 min, increased about 24-fold to 28-fold, comparing to its average concentration in native wood. During the pretreatment process, wood biomass absorbed the iron that at high temperatures passed from the pretreatment equipment to the solution. The average concentration of the elements under research in liquid fraction obtained during SE and LHW of wood biomass with duration of the pretreatments 15 and 60 min was at a low level.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48550097","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

Cross-correlation of color and acidity of wet beech wood in the process of thermal treatment with saturated steam 湿山毛榉木材饱和蒸汽热处理过程中颜色与酸度的相互关系

IF 1.3 4区农林科学

Wood Research Pub Date : 2021-03-08 DOI: 10.37763/WR.1336-4561/66.1.105116

L. Dzurenda, Michal Dudiak

引用次数: 8

Analysis of cutting force in the process of chipless felling wood 无屑木材采伐过程中切削力的分析

IF 1.3 4区农林科学

Wood Research Pub Date : 2021-03-08 DOI: 10.37763/WR.1336-4561/66.1.153160

P. Harvánek, J. Kováč, J. Melicherčík

引用次数: 1

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":null,"pages":null},"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":null,"pages":null},"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