WOOD RESEARCH 67(6) 2022最新文献

STUDY OF DEWATERING CHARACTERISTICS OF EUCALYPTUS WOOD BY SUPERCRITICAL CO2 桉木超临界co2脱水特性研究

WOOD RESEARCH 67(6) 2022 Pub Date : 2022-12-13 DOI: 10.37763/wr.1336-4561/67.6.908918

Honghai Liu, Xiaokai Zhang, Jing-Wen Zhang

{"title":"STUDY OF DEWATERING CHARACTERISTICS OF EUCALYPTUS WOOD BY SUPERCRITICAL CO2","authors":"Honghai Liu, Xiaokai Zhang, Jing-Wen Zhang","doi":"10.37763/wr.1336-4561/67.6.908918","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.6.908918","url":null,"abstract":"Wood collapse is a major defect for their applications in solid wood production. Supercritical CO2(ScCO2) dewatering can quickly remove water in wood and effectively reduce the capillary tension leading to collapse of wood structure. In this study, Eucalyptus exsertaF.V. Muellwoodwas dewatered using ScCO2at 35,45,55°Cand 15,20,25 MPa, separately. The dewatering characteristics and wood deformationwere statistically analyzed and compared after dewatering. The results show that the dewatering rateof ScCO2isaffected by moisture content (MC)of wood, showing the higher the MC, the faster the dewatering. Itisalso affected significantly by pressure, indicating increased dewatering ratewith thepressure. The effect of temperature on dewatering rate is not apparent as the pressure is less than 25MPa, but it becomes significantat 25MPacondition, showing an increased dewatering rate with temperature. In this experiment, the greatest dewatering rate was 19.8%·h-1at 55°Cand 25MPa. The transversal shrinkage of all specimens after 5 cycles dewatering waslower than1.5%, indicating the ScCO2dewatering could effectively inhibit collapse of eucalyptus wood structure. Thetransversal shrinkage decreases with the pressure, and is not affected significantly by temperature.","PeriodicalId":358045,"journal":{"name":"WOOD RESEARCH 67(6) 2022","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126739670","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: 0

DIMENSIONAL STABILITY AND DURABILITY OF HYBRID SANDWICH PANEL MADE FROM OIL PALM LUMBER, SENGON AND GMELINA WITH BORON-ALUM IMPREGNATION 硼明矾浸渍油棕木材、松木和细木耳复合夹层板的尺寸稳定性和耐久性

WOOD RESEARCH 67(6) 2022 Pub Date : 2022-12-13 DOI: 10.37763/wr.1336-4561/67.6.10171031

J. Malik, Erlina NURUL AINI, Deazy RACHMI TRISATYA, S. Suhartana, I. Wahyudi, S. Augustina

引用次数: 0

EXPERIMENTAL VERIFICATION OF THE MODERN SEMI-RIGID TIMBER CONNECTIONS 现代半刚性木材连接的试验验证

WOOD RESEARCH 67(6) 2022 Pub Date : 2022-12-13 DOI: 10.37763/wr.1336-4561/67.6.10051016

Matúš Neusch, J. Sandanus, Klara Freudenberger

引用次数: 0

EVALUATION OF WOOD SURFACE ROUGHNESS BY CONFOCAL MICROSCOPY 用共聚焦显微镜评价木材表面粗糙度

WOOD RESEARCH 67(6) 2022 Pub Date : 2022-12-13 DOI: 10.37763/wr.1336-4561/67.6.919928

Endre Magoss, R. Rozs, S. Tatai

{"title":"EVALUATION OF WOOD SURFACE ROUGHNESS BY CONFOCAL MICROSCOPY","authors":"Endre Magoss, R. Rozs, S. Tatai","doi":"10.37763/wr.1336-4561/67.6.919928","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.6.919928","url":null,"abstract":"The main aim of this study is to define the usability of the confocal scanning optical microscope (CSOM) to evaluate the wood surface roughness. Therefore, systematic investigation was carried out to define the influences of CSOM on the acquisition of 2D surface roughness parameters. Mahr Perthometer was applied to get reference data to estimatetheapplicability of the CSOM. Because wood roughness parameters measured with stylus and optical methods are not always comparable a calibration method was conducted on a metal calibration etalon. After the calibration process, the roughness profiles taken with the optical and stylus units were much closer to each other and only the optical Rpkparameter was definitely higher due to artificial peaks generated by the optical system. In order to eliminate this measuringfailure, the morphological filter option of the optical apparatus may be activated. Thesurface roughness parameters were measured on planed Scotch pine samples. The planed surface plains were produced with 0.2 mm parallel offset to investigate thestructural influence of the single cutting plains. The obtained results show that the average values for Ra, Rq, Rz, Rk, and Rvkare close to each other for both measuring systems, only theoptically measured Rpkvalues must be corrected. The standard deviations, however, are systematically slightly higher for optical system. This may be explained by the higher resolution of the optical system giving more fine profile details. The earlier developed and introduced dimensionless quantities, such as Abbott ratio, are also fully comparable for both systems provided that the optically measured Rpkvalues are also correct.","PeriodicalId":358045,"journal":{"name":"WOOD RESEARCH 67(6) 2022","volume":"2000 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125731255","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

USING EXOTIC SHRUBS AS A RESTORATION TOOL IN TUNISIAN ARID AREAS: EFFECTS ON UNDERSTOREY VEGETATION AND SOIL NUTRIENTS 利用外来灌木作为突尼斯干旱地区的恢复工具:对林下植被和土壤养分的影响

WOOD RESEARCH 67(6) 2022 Pub Date : 2022-12-13 DOI: 10.37763/wr.1336-4561/67.6.10461055

I. Mezghani

{"title":"USING EXOTIC SHRUBS AS A RESTORATION TOOL IN TUNISIAN ARID AREAS: EFFECTS ON UNDERSTOREY VEGETATION AND SOIL NUTRIENTS","authors":"I. Mezghani","doi":"10.37763/wr.1336-4561/67.6.10461055","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.6.10461055","url":null,"abstract":"In this study, the effects of exotic and native shrubs Acacia salicinaand Retama raetamon understory vegetation and soil properties were assessed. Two sub-habitats, acanopied and anun-canopied sub-habitat (open grassland), were distinguished for each shrub species. Soil moisture was measured in both sub-habitats at 10 cm depth, and soil samples collected from theupper 10 cm soil, excluding litter and stones. Aboveground biomass, species density and species richness were also estimated. The soil organic matter, total N and extractable P were significantly higher under shrubs than open areas at all soil water contents. Soil water content did not differ significantly between studied shrubs. Aboveground biomass, species richness and the density of perennial species were significantly higher under shrub canopiesthan open areas. Among the two studied shrubs species, Retama raetamdisplayed the strongest positive effect, but without significant differences, on the understory vegetation. From this perspective, exotic shrubs can be regarded as a powerful and promising candidate that can be invested in not only theelaboration of multiple restoration programs but also in the generation of islands of resources.","PeriodicalId":358045,"journal":{"name":"WOOD RESEARCH 67(6) 2022","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133039913","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: 0

STUDY ON THE DISPERSION CHARACTERISTICS OF WOOD ACOUSTIC EMISSION SIGNAL BASED ON WAVELET DECOMPOSITION 基于小波分解的木材声发射信号色散特性研究

WOOD RESEARCH 67(6) 2022 Pub Date : 2022-12-13 DOI: 10.37763/wr.1336-4561/67.6.966978

G. Qin, Ming Li, Saiyin Fang, Tingting Deng, Changli Huang, Zhouling Yang, Feilong Mao, Yue Zhao

引用次数: 0

EFFECT OF H2SO4/HCLO4 MIXTURE ON PROPERTIES OF SUGARCANE BAGASSE CELLULOSE CRYSTALS h2so4 / hclo4混合物对甘蔗渣纤维素晶体性质的影响

WOOD RESEARCH 67(6) 2022 Pub Date : 2022-12-13 DOI: 10.37763/wr.1336-4561/67.6.929940

Nduduzo Khumalo, S. Mohomane, S. Motloung, L. Koao, Malevu D. Thembinkosi, T. Motaung

{"title":"EFFECT OF H2SO4/HCLO4 MIXTURE ON PROPERTIES OF SUGARCANE BAGASSE CELLULOSE CRYSTALS","authors":"Nduduzo Khumalo, S. Mohomane, S. Motloung, L. Koao, Malevu D. Thembinkosi, T. Motaung","doi":"10.37763/wr.1336-4561/67.6.929940","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.6.929940","url":null,"abstract":"The main objective of the study was to investigate the effect of mixed acid concentration on the morphology, crystallinity and thermal properties of cellulose nanocrystals (CNCs). Acid hydrolysis using mixture of sulphuric (H2SO4)acid and perchloric (HClO4) acid was used to extract CNCs from sugarcane bagasse (SCB). The properties of the raw SCB, extracted cellulose,45% H2SO4 hydrolysed CNCs,45% H2SO4/HClO4 hydrolysed CNCs, 55% H2SO4/HClO4 hydrolysed CNCs and 65% H2SO4/HClO4 hydrolysed CNCs were analysed using Fourier transmission infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). Thecrystallinity of SCB was significantly increased after bleaching and acid hydrolysis. Acid hydrolysis using 55% H2SO4/HClO4 showed the highest crystallinity. The TGA results showed significant increase in thermal stability of 55% H2SO4/HClO4. The lowest thermal stability was observed with 45% H2SO4 hydrolysed CNCs. The order of thermal stability was raw SCB < extracted cellulose < 45% H2SO4hydrolysed CNCs < 65% H2SO4/HClO4 hydrolysed CNCs < 45% H2SO4/HClO4 hydrolysed CNCs < 55% H2SO4/HClO4 hydrolysed CNCs. The SEM results showed fibre breakage for 65% H2SO4/HClO4 hydrolysed CNCs. Thefibre breakage seemed to be acid concentration dependent.","PeriodicalId":358045,"journal":{"name":"WOOD RESEARCH 67(6) 2022","volume":"106 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120968626","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

RESEARCH PROGRESS OF SOLID WOOD BENDING SOFTENING TECHNOLOGY. REVIEW 实木弯曲软化技术的研究进展。审查

WOOD RESEARCH 67(6) 2022 Pub Date : 2022-12-13 DOI: 10.37763/wr.1336-4561/67.6.10561073

Yang Wu, Jiangang Zhu, Q. Qi, Lina Cui

引用次数: 1

FIRE RETARDANT PERFORMANCE OF SUGI AND HINOKI TREATED WITH PHOSPHORUS AND NITROGEN FIRE RETARDANT 磷氮阻燃剂对杉木和杉木的阻燃性能研究

WOOD RESEARCH 67(6) 2022 Pub Date : 2022-12-13 DOI: 10.37763/wr.1336-4561/67.6.941952

Chao Deng, Yang Liu, Junxiang Xu, Xiangyu Li, Mingyu Wen, Xixin Duan, Hee-Yeol Park

引用次数: 0

IMPACT OF TEMPERATURE AND ULTRAVIOLET RADIATION ON CHANGES OF COLOUR OF FIR AND SPRUCE WOOD 温度和紫外线辐射对冷杉和云杉木材颜色变化的影响

WOOD RESEARCH 67(6) 2022 Pub Date : 2022-12-13 DOI: 10.37763/wr.1336-4561/67.6.894907

Peter Godovčin, J. Martinka, P. Rantuch, Martina Hladová, Juraj Kopúnek, Mária Otajovičová, Mária Zuzana Bednáriková

{"title":"IMPACT OF TEMPERATURE AND ULTRAVIOLET RADIATION ON CHANGES OF COLOUR OF FIR AND SPRUCE WOOD","authors":"Peter Godovčin, J. Martinka, P. Rantuch, Martina Hladová, Juraj Kopúnek, Mária Otajovičová, Mária Zuzana Bednáriková","doi":"10.37763/wr.1336-4561/67.6.894907","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.6.894907","url":null,"abstract":"This study deals with the investigation of impact of temperature and ultraviolet (UV) radiation on spruce wood (Picea abies(L.) H. Karst.) and fir wood (Abies albaMill.) colour changes. Samples of investigated woods species were loaded by temperatures of 110, 130, and 150°C and UV radiation (with 253.7 nm wavelength and 40 W m-2intensity) during 72, 168, 336 and 672 hours. Colour changes were evaluated in the CIE Lab colour space. Theneural network for prediction of both colour coordinates and total colour difference of spruce and fir wood was trained by data regarding exposure conditions (temperature, UV radiation and time) and by obtained results. Coefficient of determination (R2) of the neural network was above 0.99 for training, validation and testing. Average colour coordinates (±standard deviation) of the spruce and fir wood before exposure were L* = 80.08 ± 3.70,a* = 7.55 ± 2.13, b* = 21.56 ± 1.79, L* = 80.46 ± 1.91, a* = 6.84 ± 0.97, and b* = 18.90 ± 1.26, resp. Total colour differences after thermal loading were in the interval from ΔEab* = 3.76 ± 1.95 (spruce wood at 110°C) to ΔEab* = 45.37±1.46 (fir wood at 150°C). Total colour differences of both wood species exposed by UV radiation were approximately in intervals from ΔEab* = 12 to 13 (after 72 h) up to ΔEab* = 16 to 20 (after 168 to 672 h). Obtained results proven that both temperature and UV radiation have significant impact on the colour changes of the investigated woods.","PeriodicalId":358045,"journal":{"name":"WOOD RESEARCH 67(6) 2022","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132470936","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