Holzforschung最新文献_第7页

Microscopic computed tomography aided finite element modelling as a methodology to estimate hygroexpansion coefficients of wood: a case study on opposite and compression wood in softwood branches 微观计算机断层扫描辅助有限元建模作为一种方法来估计木材的湿膨胀系数:对软木枝上的对生和压缩木材的案例研究

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-08-31 DOI: 10.1515/hf-2023-0014

S. Florisson, M. Hartwig, M. Wohlert, E. Gamstedt

{"title":"Microscopic computed tomography aided finite element modelling as a methodology to estimate hygroexpansion coefficients of wood: a case study on opposite and compression wood in softwood branches","authors":"S. Florisson, M. Hartwig, M. Wohlert, E. Gamstedt","doi":"10.1515/hf-2023-0014","DOIUrl":"https://doi.org/10.1515/hf-2023-0014","url":null,"abstract":"Abstract Microscopic X-ray computed tomography (XµCT) aided finite element (FE) modelling is a popular method in material science to relate material properties to heterogeneous microstructures. Recently, a methodology was developed for the XµCT aided FE modelling of wood, which characterises the process from specimen preparation to estimation of material properties. In the current research, this methodology is tested on branches of Norway spruce (Picea abies (L.) Karst.) to estimate the hygroexpansion coefficients of opposite (OW) and compression wood (CW). These properties are largely unknown and have engineering implications. The study is complemented by measurements of density, moisture content (MC) and elastic moduli. Results showed that the methodology assisted in the design of an integrated process and the identification of bottlenecks. It was seen that the level of detail of the numerical model had a strong influence on the obtained hygroexpansion properties. CW from branches showed higher density and longitudinal shrinkage coefficients, and elastic moduli less affected by MC. These differences are unlikely caused by MC, but more likely by the characteristics of the microstructure.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48768811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Planting spacing influences radial variation of basic density and chemical composition of wood from fast growing young Eucalyptus plantations 种植间距影响速生幼桉树人工林木材基本密度和化学成分的径向变化

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-08-04 DOI: 10.1515/hf-2023-0016

E. M. Pimenta, Emilly Gracielly dos Santos Brito, Paola Freitas Gomes, F. Ramalho, G. B. Vidaurre, A. M. Couto, O. Campoe, P. R. Hein

{"title":"Planting spacing influences radial variation of basic density and chemical composition of wood from fast growing young Eucalyptus plantations","authors":"E. M. Pimenta, Emilly Gracielly dos Santos Brito, Paola Freitas Gomes, F. Ramalho, G. B. Vidaurre, A. M. Couto, O. Campoe, P. R. Hein","doi":"10.1515/hf-2023-0016","DOIUrl":"https://doi.org/10.1515/hf-2023-0016","url":null,"abstract":"Abstract Planting spacing plays an important role in tree growth and wood formation. Thus, the aim of this study was to determinate how planting spacing and genetic material affect the radial variation of basic density and chemical composition of wood. The sampling of this study was based on 4 clones of Eucalyptus urophylla × Eucalyptus grandis at 5 years of age planted in four spacings (3 × 1, 3 × 2, 3 × 3 and 3 × 4 m). To determine the basic density (BD), extractive (EXT) and lignin (LT) content, wood discs were removed at breast height, which were sectioned in three radial positions (pith, intermediate and sapwood). The results showed that genetic material, planting spacing and radial position affected the values of BD, EXT and LT content. The BD and EXT content tended to increase with increased planting spacing, while the LT content tended to decrease. In relation to the radial variation, the basic density showed an increase in the pith-bark direction, while the EXT content showed a decrease in this direction. For LT, no significant difference was observed in the pith-bark direction. In general, the largest planting spacings promoted the highest rates of variation of the properties studied.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44352317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Fit-free analysis of fluorescence lifetime imaging data using chemometrics approach for rapid and nondestructive wood species classification 使用化学计学方法对荧光寿命成像数据进行无拟合分析，实现木材物种的快速无损分类

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-08-04 DOI: 10.1515/hf-2023-0017

Te Ma, T. Inagaki, S. Tsuchikawa

{"title":"Fit-free analysis of fluorescence lifetime imaging data using chemometrics approach for rapid and nondestructive wood species classification","authors":"Te Ma, T. Inagaki, S. Tsuchikawa","doi":"10.1515/hf-2023-0017","DOIUrl":"https://doi.org/10.1515/hf-2023-0017","url":null,"abstract":"Abstract Conventional fluorescence spectroscopy has been suggested as a valuable tool for classifying wood species rapidly and non-destructively. However, because it is challenging to conduct absolute emission intensity measurements, fluorescence analysis statistics are difficult to obtain. In this study, another dimension of fluorescence, that is, fluorescence lifetime, was further evaluated to address this issue. A time-resolved fluorescence spectroscopic measurement system was first designed, mainly using a streak camera, picosecond pulsed laser at 403 nm, and a spectroscope, to collect the fluorescence time-delay (FTD) profiles and steady-state fluorescence intensity (FI) spectra simultaneously from 15 wood species. For data analysis, principal component analysis was used to “compress” the mean-centered FTD and FI spectra. Then, support vector machine classification analysis was utilized to train the wood species classification model based on their principal component scores. To avoid overfitting, ten-fold cross-validation was used to train the calibration model using 70 % of the total samples, and the remaining 30 % hold-out validation was used to test its reproducibility. The cross-validation accuracies were 100 % (5 softwoods) and 96 % (10 hardwoods), with test-validation accuracies of 96 % and 89 %.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47396039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Improved bleached eucalyptus kraft pulp-based tissue papers incorporating wet-strength resins 含湿强树脂的改进漂白桉木硫酸盐纸浆基薄纸

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-08-03 DOI: 10.1515/hf-2023-0007

Marina Matos, Ana M. M. S. Carta, P. Pinto, D. Evtuguin

{"title":"Improved bleached eucalyptus kraft pulp-based tissue papers incorporating wet-strength resins","authors":"Marina Matos, Ana M. M. S. Carta, P. Pinto, D. Evtuguin","doi":"10.1515/hf-2023-0007","DOIUrl":"https://doi.org/10.1515/hf-2023-0007","url":null,"abstract":"Abstract Common tissue paper manufacturing trends aim at partial or total replacement of softwood pulp with hardwood pulp for its production, such as bleached eucalyptus kraft pulp (BEKP), in order to optimize the process and the final product properties such as softness. However, the use of a single type of hardwood fiber results in lower strengths of both wet and dry webs. To maintain necessary strength and desired properties, the incorporation of several additives is often required. In this context, low molecular weight polyethylene glycol (PEG) and different wet strength resins, such as polyamideamine-epichlorohydrin (PAE) and glyoxalated polyacrylamide (GPAM) resins, were combined to achieve an innovated product with improved properties. In particular, wet and dry tensile strength was significantly improved when combining PEG and wet strength resins, especially observed in tissue papers prepared with PAE resin, high-charge cationic agent and bulk applied aqueous PEG solution. Noteworthy that water absorption capacity and softness of tissue paper were not critically affected by PEG incorporation, regardless of application method used (in bulk or by spray).","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45308043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Frontmatter 头版头条

3区农林科学

Holzforschung Pub Date : 2023-08-01 DOI: 10.1515/hf-2023-frontmatter8

引用次数: 0

Site quality impacts tree form, heartwood content and veneer production of plantation-grown Pinus patula 立地质量影响人工林带松的树形、心材含量和单板产量

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-07-27 DOI: 10.1515/hf-2023-0031

J. van der Merwe, Sechaba Madiope, Olwethu Spogter, Hilton Kuisis, J. Potgieter, Oscar Tait, Charles D. Clarke, S. Mansfield

{"title":"Site quality impacts tree form, heartwood content and veneer production of plantation-grown Pinus patula","authors":"J. van der Merwe, Sechaba Madiope, Olwethu Spogter, Hilton Kuisis, J. Potgieter, Oscar Tait, Charles D. Clarke, S. Mansfield","doi":"10.1515/hf-2023-0031","DOIUrl":"https://doi.org/10.1515/hf-2023-0031","url":null,"abstract":"Abstract Plantation forest species were introduced into South Africa due to limited availability of native forests for wood-derived products. Currently, the Mexican pine species, Pinus patula, is the most widely planted softwood species in the country. To study the effect of growth environment on wood and processing properties for the species, sample plots were established in a 20-year rotation covering a wide range of soil geologies and altitudes in Mpumalanga, South Africa. Temperature and seasonal rainfall were also determined for the sample plots. Randomly selected sample trees were harvested from the plots and processed at a plywood plant to determine veneer recovery and quality. Trees grown on sites composed of granite soils, with higher annual maximum temperatures and less rainfall, found in the Highveld region, displayed superior tree size, slenderness, and volume growth, compared to trees grown on dolomite and shale soils common to the Lowveld region. Veneer derived from Lowveld trees had more splits which were largely related to defects. Larger trees also had a greater percentage volumetric heartwood and a smaller live crown, compared to smaller trees. Highveld trees had greater net veneer recovery and produced better quality veneer than trees grown on the Lowveld. In the Mpumalanga forestry region, strong co-relatedness exists between soil geology, altitude, and climate. Although tree form and wood properties were found to differ with varying soil geology and altitude, these differences were primarily related to climate rather than soil properties. These findings highlight the pitfalls associated with neglecting either climate or soil properties when analysing site-specific growing conditions on tree growth and form.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45534028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Comparative investigation of chemical and structural properties of charred fir wood samples by Raman and FTIR spectroscopy as well as X-ray-micro-CT technology 利用拉曼光谱和傅里叶红外光谱以及x射线显微ct技术对炭化杉木样品的化学和结构特性进行了对比研究

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-07-24 DOI: 10.1515/hf-2023-0024

D. Ebner, M. Tortora, D. Bedolla, G. Saccomano, L. Vaccari, M. Barbu, J. Grzybek, T. Schnabel

{"title":"Comparative investigation of chemical and structural properties of charred fir wood samples by Raman and FTIR spectroscopy as well as X-ray-micro-CT technology","authors":"D. Ebner, M. Tortora, D. Bedolla, G. Saccomano, L. Vaccari, M. Barbu, J. Grzybek, T. Schnabel","doi":"10.1515/hf-2023-0024","DOIUrl":"https://doi.org/10.1515/hf-2023-0024","url":null,"abstract":"Abstract Wood surface charring is a treatment method commonly employed to enhance weather protection and aesthetic appearance of building exteriors. This study aims to investigate the differences between two wood surface charring processes: the traditional Japanese method known as Yakisugi and an alternative charring technique industrially manufactured with a gas burner. The objective of the study was to assess whether a thicker layer after Yakisugi treatment has any advantages over a thinner layer after the alternative process. Vibrational spectroscopy techniques including UV resonance Raman (UVRR) and Fourier transform infrared (FTIR) spectroscopy, were utilized in conjunction with X-ray-micro-CT analysis. The findings revealed that ATR-FTIR spectroscopy detected the degradation of carbohydrates and changes in lignin within the charred surface, although both processes exhibited similar vibrational contributions. In contrast, UVRR spectroscopy provided insights into the carbonized layers, revealing spectral differences indicating variations in temperature during the charring processes. X-ray micro-CT analysis visually highlighted significant differences in the coal layers, suggesting distinct combustion profiles. Remarkably, the macrostructure of wood treated with Yakisugi remained intact despite a thicker charred layer compared to the alternative charring techniques. However, further investigations are required to assess the weather stability of the alternative charring method for a comprehensive understanding.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44029533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Swelling behavior of thermally modified timber from a cellular and chemical perspective 从细胞和化学角度看热改性木材的膨胀行为

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-07-17 DOI: 10.1515/hf-2023-0033

Yufa Gao, Yongdong Zhou, Zongying Fu, J. Van den Bulcke, J. Van Acker

{"title":"Swelling behavior of thermally modified timber from a cellular and chemical perspective","authors":"Yufa Gao, Yongdong Zhou, Zongying Fu, J. Van den Bulcke, J. Van Acker","doi":"10.1515/hf-2023-0033","DOIUrl":"https://doi.org/10.1515/hf-2023-0033","url":null,"abstract":"Abstract Thermally modified timber (TMT) reduces hygroscopicity, increases dimensional stability, and decay resistance. Although there is a substantial amount of research on heat-treated wood, investigations on the sensitivity of cell wall swelling behavior to water variation are limited. Therefore, this study focused on the swelling behavior of TMT from cellular and chemical perspectives. The effects of heat treatment on the hygroscopicity and swelling behavior of the wood cell walls were studied using dynamic vapor sorption and confocal laser scanning microscopy. Changes in the chemical composition and cellulose crystallinity were studied using attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray diffraction. The results revealed that the hygroscopic swelling of latewood significantly decreased with increasing treatment temperature, reducing the anisotropy of the wood cell swelling. The hygroscopicity of wood was reduced by heat treatment, and a clear decrease in hysteresis was observed at elevated treatment temperatures. The FTIR spectra indicated that both hemicellulose and lignin were degraded. The crystallinity and lateral size of the cellulose increased after heat treatment. Similar changes in the chemical composition and crystallinity of cellulose were observed in the latewood and earlywood.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48587440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Antifungal properties of lauric arginate (LAE) treated wood 月桂酸酯（LAE）处理木材的抗真菌性能

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-07-10 DOI: 10.1515/hf-2023-0013

Courage Alorbu, Joshua Carey, A. McDonald, Li-Juan Cai

{"title":"Antifungal properties of lauric arginate (LAE) treated wood","authors":"Courage Alorbu, Joshua Carey, A. McDonald, Li-Juan Cai","doi":"10.1515/hf-2023-0013","DOIUrl":"https://doi.org/10.1515/hf-2023-0013","url":null,"abstract":"Abstract This study investigated the efficacy of lauric arginate (LAE) as a potential preservative against wood deteriorating fungi. First, the antifungal properties of LAE against two brown rot fungi, Gloeophyllum trabeum (G.t.) and Rhodonia placenta (R.p.), and two white rot fungi, Trametes versicolor (T.v.) and Irpex lacteus (I.l.) were examined using malt-agar media as substrate. Then the biological resistance of LAE-treated wood specimens (10, 20, and 25 % LAE solutions) was tested following American Wood Protection Association (AWPA) E10 soil-block test procedures. The in vitro study showed LAE actively inhibited the growth of all the fungi tested compared to growth in control plates but there were no considerable changes observed in the morphology of fungi hyphae. Wood impregnated with LAE showed increased weight percent gain as a function of treatment concentration. Characterization of LAE-treated wood on a thermogravimetric analyzer showed LAE shifted the thermal degradation temperatures to lower stages but did not significantly improve the thermal stability of the treated specimen. LAE in wood significantly suppressed fungus growth, leading to decreased mass loss but it also leached out from wood specimens during fungi exposure.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"77 1","pages":"640 - 647"},"PeriodicalIF":2.4,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42810028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Natural durability and fungal diversity of five wood species in a field-test site in Jeongseon, Korea 韩国旌善地区5种木材的自然耐久性和真菌多样性

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-07-10 DOI: 10.1515/hf-2023-0034

Sae-Min Yoon, Min-ji Kim, W. Hwang, Hyun-Mi Lee, Yonggun Park, Dong-Won Son, Yeong-Suk Kim, Yong-Seok Choi

{"title":"Natural durability and fungal diversity of five wood species in a field-test site in Jeongseon, Korea","authors":"Sae-Min Yoon, Min-ji Kim, W. Hwang, Hyun-Mi Lee, Yonggun Park, Dong-Won Son, Yeong-Suk Kim, Yong-Seok Choi","doi":"10.1515/hf-2023-0034","DOIUrl":"https://doi.org/10.1515/hf-2023-0034","url":null,"abstract":"Abstract Climate change from global warming raises the risk of wood decay. Knowing the inherent durability period of wood is crucial for long-term use. Hence, the natural durability of five important Korean wood species (Larix kaempferi, Pinus densiflora, Quercus rubra, Quercus variabilis, and Quercus serrata) was evaluated. In addition, the fungal diversity isolated from each wood stake was investigated to compare and analyze the differences in natural durability. The natural durability of the five wood species was determined to be highest in Larix kaempferi and Quercus serrata, followed by Quercus variabilis, Quercus rubra, and Pinus densiflora. Overall, 306 fungal isolates were collected, including 16 species of Ascomycota, 22 species of Basidiomycota, 15 species of Zygomycota, and eight unidentified species, which dominate different positions of the wood stake. Less Basidiomycota diversity was observed in the two wood species with high durability. In addition, the isolation of not only Basidiomycota but also Ascomycota and Zygomycota could affect wood deterioration and explain the association with wood durability. These findings are expected to be useful in improving the durability of useful wood in Korea in an era of climate change, where the risk of wood decay is increasing.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"77 1","pages":"577 - 584"},"PeriodicalIF":2.4,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42427753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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