Wood Research最新文献_第10页

Moisture at contacts of timber-concrete element. 木-混凝土构件接触处的水分。

IF 1.3 4区农林科学

Wood Research Pub Date : 2020-12-16 DOI: 10.37763/wr.1336-4561/65.6.917924

R. Fojtík, L. Kubíncová, V. Dubovský, K. Kozlová

引用次数: 2

Optimization of cutting speed and clearance angle in the disc chipper. 圆盘切屑机切削速度和间隙角的优化。

IF 1.3 4区农林科学

Wood Research Pub Date : 2020-12-16 DOI: 10.37763/wr.1336-4561/65.6.951962

Mariusz Reczulski

引用次数: 1

Changes in physical-mechanical properties and chemical compositions of Toona sinensis wood before and after thermal treatment. 香椿木材热处理前后物理力学性能和化学成分的变化。

IF 1.3 4区农林科学

Wood Research Pub Date : 2020-12-16 DOI: 10.37763/wr.1336-4561/65.6.877884

Jiulong Xie, Lin Chen, Huijuan Shao, Lu He, Yongze Jiang, L. Dan, Hui Xiao, Yuzhu Chen, Xingyan Huang, Jianfeng Hao, L. Tu, Tiantian Lin, Yin-long Xiao, Gang Chen, Jinqiu Qi

{"title":"Changes in physical-mechanical properties and chemical compositions of Toona sinensis wood before and after thermal treatment.","authors":"Jiulong Xie, Lin Chen, Huijuan Shao, Lu He, Yongze Jiang, L. Dan, Hui Xiao, Yuzhu Chen, Xingyan Huang, Jianfeng Hao, L. Tu, Tiantian Lin, Yin-long Xiao, Gang Chen, Jinqiu Qi","doi":"10.37763/wr.1336-4561/65.6.877884","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/65.6.877884","url":null,"abstract":"Vacuum heat treatment was used to improve the dimensional stability of Toona sinensis wood in this study, the shrinking and swelling rates, the physical-mechanical properties, and the chemical compositions before and after the thermal treatment were evaluated. The results revealed that the volume shrinkage and swelling rate for the heat-treated wood samples were decreased by 45.60% and 49.95%, respectively at 220°C for 6 h indicating that thermal treatment could obviously improve the dimensional stability of Toona sinensis wood. Thermal treatment also decreased the mechanical strength. The surface color was changed by the treatment. The chemical composition results showed the decrease in density and mechanical strength was due to the partial degradation of hemicellulose during the treatment. The results of this study that vacuum heat treatment could improve the dimensional stability by sacrificing somewhat mechanical strength, the treatment conditions mainly the temperature should be properly controlled to archive an optimized improvement in dimensional stability with minimum reduction in mechanical strength.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43168605","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

Properties of water steam-treated maple wood (Acer pseudoplatanus L.). 水蒸汽处理枫木(Acer pseudoplatanus L.)的性能。

IF 1.3 4区农林科学

Wood Research Pub Date : 2020-12-16 DOI: 10.37763/wr.1336-4561/65.6.865876

I. Novák, A. Kleinová, I. Janigová, M. Mičušík, J. Sedliačik, M. Šlouf, P. Bekhta, J. Matyasovsky, P. Jurkovič

引用次数: 0

Energy potential of the Fischer-Tropsch fuel produced from spruce wood. 由云杉木材生产的费托燃料的能量潜力。

IF 1.3 4区农林科学

Wood Research Pub Date : 2020-12-16 DOI: 10.37763/wr.1336-4561/65.6.895904

J. Poledník, J. Martinka, P. Rantuch, K. Balog, J. Skřínský, M. Wnukowski, Z. Lacný, A. Bernatik

引用次数: 0

Optimisation of acid hydrolysis in ethanol production from Ampelodesmos mauritanicus (Diss). 毛利塔尼蛇酸水解产乙醇工艺的优化。

IF 1.3 4区农林科学

Wood Research Pub Date : 2020-12-16 DOI: 10.37763/wr.1336-4561/65.6.10131024

C. May, A. Moussa

引用次数: 2

Xylogenesis and phloemogenesis of Norway spruce in different ages stands at middle altitudinal zone. 挪威云杉不同龄期的木本发育和韧皮发育均集中在中高带。

IF 1.3 4区农林科学

Wood Research Pub Date : 2020-12-16 DOI: 10.37763/wr.1336-4561/65.6.937950

Jana Hacurová, J. Hacura, V. Gryc, J. Černý, H. Vavrčík

{"title":"Xylogenesis and phloemogenesis of Norway spruce in different ages stands at middle altitudinal zone.","authors":"Jana Hacurová, J. Hacura, V. Gryc, J. Černý, H. Vavrčík","doi":"10.37763/wr.1336-4561/65.6.937950","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/65.6.937950","url":null,"abstract":"This study aimed to determine the influence of the stand age and selected weather conditions on the cambial activity, xylem and phloem formation and their development. For the analysis, microcores were taken weekly from two corresponding stands of Norway spruce (Picea abies (L.) Karst.) with various ages (35and 106-years-old) during the growing season 2012 in the Czech Republic. Young specimens were characterised by higher cambium activity; however, more considerable variation and imbalance were found there. In old trees, delayed processes during the development of the xylem and phloem at the cell level were proved. The cambium activity started in March till mid-April, and it lasted for 22 weeks in both cases. The commencement of xylogenesis was established in the first half of May. In both investigated stands, the fully lignified ring was observed at the end of October. For the creation of most xylem cells, it was required 124 and 121 days in the young and old stands, respectively. Daily increment of 0.57 (young) and 0.49 (old) cells on average was observed during the active xylem growth. The relationship between air temperature and wood cell formation for both age groups was recorded. The precipitation influenced wood development just in the case of the young trees. Phloem formation was resistant to external influence according to the Pearson correlation coefficient.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41319994","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: 3

Aboveground biomass basic density of hardwoods tree species. 阔叶树种地上生物量基本密度。

IF 1.3 4区农林科学

Wood Research Pub Date : 2020-12-16 DOI: 10.37763/wr.1336-4561/65.6.10011012

R. Petráš, J. Mecko, Danica Krupová, A. Pažitný

{"title":"Aboveground biomass basic density of hardwoods tree species.","authors":"R. Petráš, J. Mecko, Danica Krupová, A. Pažitný","doi":"10.37763/wr.1336-4561/65.6.10011012","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/65.6.10011012","url":null,"abstract":"The influence of tree species on basic density of wood, bark and small-wood was investigated here. Experimental material was obtained from 73 trees of 7 tree species, namely alder (Alnus glutinosa (L.) Gaertn.), beech (Fagus sylvatica L.), birch (Betula pendula Roth.), hornbeam (Carpinus betulus L.), Black locust (Robinia pseudoacacia L.), Sessile oak (Quercus petraea (Matt.) Liebl.) and Turkey oak (Quercus cerris L.) from the territory of Slovakia. Wood and bark samples were taken from discs cut from three trunk sections and from small-wood and branch parts coming from tree crowns. The volume of green samples was measured in graduated cylinders with a precision of 1 ml; a dry matter was measured with a precision of 0.01 g. The statistically significant effect has been shown in tree species, biomass fractions and locations on the tree. The average basic density of all species varies from 440 to 650 kg.m-3 for wood, for bark it is 380-670 kg.m-3 and for small-wood outside bark it reaches 490-650 kg.m-3. Alder and Black locust tree species have the lowest and highest wood density, Black locust and Turkey oak of bark and alder and Turkey oak of small-wood.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49026990","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: 9

Effect of water leaching on photodegraded poplar wood monitored by IR spectroscopy. 红外光谱监测水浸对光降解杨木的影响。

IF 1.3 4区农林科学

Wood Research Pub Date : 2020-12-16 DOI: 10.37763/wr.1336-4561/65.6.885894

Z. Pásztory, L. Tolvaj, D. Varga

{"title":"Effect of water leaching on photodegraded poplar wood monitored by IR spectroscopy.","authors":"Z. Pásztory, L. Tolvaj, D. Varga","doi":"10.37763/wr.1336-4561/65.6.885894","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/65.6.885894","url":null,"abstract":"Poplar (Populus x euramericana cv. pannonia) samples were irradiated using ultraviolet light emitter mercury lamp. Other series of specimens were treated with the combination of UV radiation and water leaching. The total duration of UV radiation for both series of specimens was 20 days. The total duration of water leaching was 10 days. One cycle of the combined treatment consisted of 2-day UV radiation followed by one day water leaching. The IR measurement was carried out after both UV radiation and water leaching to monitor both effects separately. Lignin degradation of water leached samples was found to be greater than that of the solely UV treated samples. The guaiacyl and the syringyl lignin showed similar degradation properties. The unconjugated carbonyl groups generated by the photodegradation proved to be the most sensitive chemical components to leaching. As a consequence of photodegradation, two absorption bands of unconjugated carbonyl groups were grown up at 1715 and 1759 cm-1 wavenumbers. The band at 1759 cm-1 was much more sensitive to water leaching than the band at 1715 cm-1. Ten days of water leaching was long enough to remove all unconjugated carbonyls generated by the photodegradation. The water was able to leach out carbonyl groups (absorbing at 1745 cm-1) originally presented in poplar wood as well.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42876923","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

Extraction of betulin from the birch bark balance at pulp and paper production. 纸浆造纸中桦树皮平衡中白桦素的提取。

IF 1.3 4区农林科学

Wood Research Pub Date : 2020-11-07 DOI: 10.37763/wr.1336-4561/65.5.833842

E. Koptelova, Natalia Alekseevna Kutakova, Sergey Ivanovich Tretjakov, A. Faleva, E. Razumov, Š. Barcík

{"title":"Extraction of betulin from the birch bark balance at pulp and paper production.","authors":"E. Koptelova, Natalia Alekseevna Kutakova, Sergey Ivanovich Tretjakov, A. Faleva, E. Razumov, Š. Barcík","doi":"10.37763/wr.1336-4561/65.5.833842","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/65.5.833842","url":null,"abstract":"The technical bark was used to obtain betulin; the one which is a barking of birch balance at pulp and paper production. The bark was prepared by grinding it on a crusher of abrasive action and fractionating, thus, the main fractions were obtained: less than 1 mm (35.4%), from 3 to 4.5 mm (31.5%). The bark was separated during the grinding process, the bark prevails in the coarse fraction, while bast is found in the fine fraction. For comparison, model samples of various sizes of birch bark were obtained by hand cutting. Chemical processing of bark fractions and model birch bark samples were carried out by the use of super-high frequencies (SHF) extraction with ethyl alcohol. Raw betulin was settled from extracts. The yield of extractive substances and raw betulin was 12.1-21.9% and 5.1-16.7% from absolutely dry raw materials; the maximum yield was from a coarse fraction of the bark or from model samples with smaller particle sizes. The authors studied the kinetics of the yield of extractive substances depending on the duration of SHF-extraction for bark fractions and birch bark samples. The optimal duration of the extraction for bark fractions is 10 min, and for birch bark is 15 min. The quantitative content was determined by the high performance liquid chromatography (HPLC) method for the obtained samples of betulin raw material. The total content of triterpenoids in the samples is about 80%, the betulin share is between 70.3 72.1%, from the absolutely dry substances of the extract. Coarse fraction of the bark contains more of the main component as compared to other fractions. It is advisable to use the fine fraction of the bark as a source of phenolic substances.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":"65 1","pages":"833-842"},"PeriodicalIF":1.3,"publicationDate":"2020-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48119025","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