{"title":"Conclusions du rapporteur public","authors":"Philippe Chacot","doi":"10.35562/alyoda.8340","DOIUrl":"https://doi.org/10.35562/alyoda.8340","url":null,"abstract":"","PeriodicalId":23841,"journal":{"name":"WOOD RESEARCH 67(1) 2021","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88371004","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}
{"title":"L’office du juge administratif saisi d’une contestation de créance fiscale sur renvoi du juge-commissaire du tribunal de commerce","authors":"Melkide Hossou","doi":"10.35562/alyoda.6616","DOIUrl":"https://doi.org/10.35562/alyoda.6616","url":null,"abstract":"","PeriodicalId":23841,"journal":{"name":"WOOD RESEARCH 67(1) 2021","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89446859","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}
Pub Date : 2022-01-16DOI: 10.37763/wr.1336-4561/67.1.5162
Yinluan Qin, Longhai Chen
Eucalyptus urophylla was treated with melamine-urea-formaldehyde resin (MUF) after pretreatment with urea solution. The properties of the wood were then determined.The weight percent gain (WPG) and, antiswelling efficiencies (ASE) of the wood treated with urea+MUF were 14% and, 45% higher than those of untreated wood, respectively. The water absorption (WA) of the wood treated with urea+MUF was decreased approximately 50% lower than that of the untreated wood. However, the mechanical properties of the wood treated with urea+MUF were weakened due to the destruction of the structure of wood. An X-ray photoelectron spectroscopy (XPS) analysis revealed that the atomic concentration ratio of O/C was increased. The ratio of C1 was decreased as the lignin and extractives contents were decreased, while theratios of C2 and C3 were increased. The urea solution pretreatment was conducive to theimpregnation of wood functional modifiers.
{"title":"EFFECTS OF MODIFICATION WITH MELAMINE–UREA–FORMALDEHYDE RESIN ON THE PROPERTIES OF UREA PRETREATED EUCALYPTUS","authors":"Yinluan Qin, Longhai Chen","doi":"10.37763/wr.1336-4561/67.1.5162","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.1.5162","url":null,"abstract":"Eucalyptus urophylla was treated with melamine-urea-formaldehyde resin (MUF) after pretreatment with urea solution. The properties of the wood were then determined.The weight percent gain (WPG) and, antiswelling efficiencies (ASE) of the wood treated with urea+MUF were 14% and, 45% higher than those of untreated wood, respectively. The water absorption (WA) of the wood treated with urea+MUF was decreased approximately 50% lower than that of the untreated wood. However, the mechanical properties of the wood treated with urea+MUF were weakened due to the destruction of the structure of wood. An X-ray photoelectron spectroscopy (XPS) analysis revealed that the atomic concentration ratio of O/C was increased. The ratio of C1 was decreased as the lignin and extractives contents were decreased, while theratios of C2 and C3 were increased. The urea solution pretreatment was conducive to theimpregnation of wood functional modifiers.","PeriodicalId":23841,"journal":{"name":"WOOD RESEARCH 67(1) 2021","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90684443","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}
Pub Date : 2022-01-16DOI: 10.37763/wr.1336-4561/67.1.8695
Mengxue Li, Lei Shi, Fuxian Xia, Jiang Deng, Huaijian Liao, Ting Du, Bin-Gui Wang
The chemical constituents of ethyl acetate extracts from heartwood and sapwood of different ages of Dalbergia sissoowere studied by gas chromatography-mass spectrometry. The results showed that the chemical composition of wood heartwood and sapwood is significantly different. Inthe vertical direction, the type of the ethyl acetate extract from Dalbergia sissootends to decrease from the base to the upper portion; in the horizontal direction, the type of extract gradually decreases from the center to the periphery. And it showed an increasing trend with the age of the trees. The experiment also revealed that there were significant differences in chemical components between heartwood and sapwood. We speculated that the main chemical component trismethoxyresveratrol of heartwood extract may be related to the formation of heartwood, and the specific correlation needs to be further verified.
{"title":"CHEMICAL CONSTITUENTS OF THE STEM IN DALBERGIA SISSOO","authors":"Mengxue Li, Lei Shi, Fuxian Xia, Jiang Deng, Huaijian Liao, Ting Du, Bin-Gui Wang","doi":"10.37763/wr.1336-4561/67.1.8695","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.1.8695","url":null,"abstract":"The chemical constituents of ethyl acetate extracts from heartwood and sapwood of different ages of Dalbergia sissoowere studied by gas chromatography-mass spectrometry. The results showed that the chemical composition of wood heartwood and sapwood is significantly different. Inthe vertical direction, the type of the ethyl acetate extract from Dalbergia sissootends to decrease from the base to the upper portion; in the horizontal direction, the type of extract gradually decreases from the center to the periphery. And it showed an increasing trend with the age of the trees. The experiment also revealed that there were significant differences in chemical components between heartwood and sapwood. We speculated that the main chemical component trismethoxyresveratrol of heartwood extract may be related to the formation of heartwood, and the specific correlation needs to be further verified.","PeriodicalId":23841,"journal":{"name":"WOOD RESEARCH 67(1) 2021","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73174412","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}
Pub Date : 2022-01-16DOI: 10.37763/wr.1336-4561/67.1.170177
Maharshi J. Dave, T. Pandya, Suman Babu Ukyam, Jason Street
In this paper, an experimental investigation on the low-velocity impact response of wood-based bio-composites is presented. This study is to map the suitability of plant-based materials instead of petroleum-based plastic as a constituent raw material in composites. Wood-basedcomposites panels were made from southern yellow pine (SYP), corn starch (CS), and methylene diphenyl diisocyanate (MDI) using a Diefenbacher hot press. The impact performance of thespecimens was evaluated in terms of energy absorption capacity. Five types of bio-composites were prepared with varying compositions with SYP: 4% MDI; 2% CS and 2% MDI; 2% CS and 4% MDI; 4% CS and 4% MDI. These samples were prepared at two different manufacturing pressures. The bio-composite produced with higher manufacturing pressure had the highest absorbed energy among five different types of bio-composites, this shows that material behavior at impact loading is strongly dependent on the manufacturing pressure during fabrication.
{"title":"SHORT NOTES: THE LOW-VELOCITY IMPACT RESPONSE OF BIO-COMPOSITES","authors":"Maharshi J. Dave, T. Pandya, Suman Babu Ukyam, Jason Street","doi":"10.37763/wr.1336-4561/67.1.170177","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.1.170177","url":null,"abstract":"In this paper, an experimental investigation on the low-velocity impact response of wood-based bio-composites is presented. This study is to map the suitability of plant-based materials instead of petroleum-based plastic as a constituent raw material in composites. Wood-basedcomposites panels were made from southern yellow pine (SYP), corn starch (CS), and methylene diphenyl diisocyanate (MDI) using a Diefenbacher hot press. The impact performance of thespecimens was evaluated in terms of energy absorption capacity. Five types of bio-composites were prepared with varying compositions with SYP: 4% MDI; 2% CS and 2% MDI; 2% CS and 4% MDI; 4% CS and 4% MDI. These samples were prepared at two different manufacturing pressures. The bio-composite produced with higher manufacturing pressure had the highest absorbed energy among five different types of bio-composites, this shows that material behavior at impact loading is strongly dependent on the manufacturing pressure during fabrication.","PeriodicalId":23841,"journal":{"name":"WOOD RESEARCH 67(1) 2021","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85133613","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}
Pub Date : 2022-01-16DOI: 10.37763/wr.1336-4561/67.1.6375
Xueqiong Feng, B. Wang, Y. Qian, W. Tian
Our paper proposed a new type of environmentally friendly biomass material, corn straw integrated material (CSIM). In this paper, the ultimate bearing capacity of the axially compressed components under parallel, vertical and combined texture-integratedmethods are compared and analyzed through the experimental research. The influence of size effect on thebearing capacity of the axially compressed components of the CSIMis determined, and thecalculation method of the bearing capacity of the axially compressed components under vertical texture-integratedmethod is proposed. Results showed that the slenderness ratio of 35 was the dividing point between the strength and instability failures of the CSIM axially compressed component, and the calculated value of the revised bearing capacity calculation method agreed with the test value. The result is very close to the American National design specification for wood construction (ANSI/AF&PA NDS, 2005).
{"title":"INFLUENCE OF SIZE EFFECT ON THE BEARING CAPACITY OF THE AXIALLY COMPRESSED COMPONENTS OF CORN STRAW INTEGRATED MATERIAL AND ITS CALCULATION METHOD","authors":"Xueqiong Feng, B. Wang, Y. Qian, W. Tian","doi":"10.37763/wr.1336-4561/67.1.6375","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.1.6375","url":null,"abstract":"Our paper proposed a new type of environmentally friendly biomass material, corn straw integrated material (CSIM). In this paper, the ultimate bearing capacity of the axially compressed components under parallel, vertical and combined texture-integratedmethods are compared and analyzed through the experimental research. The influence of size effect on thebearing capacity of the axially compressed components of the CSIMis determined, and thecalculation method of the bearing capacity of the axially compressed components under vertical texture-integratedmethod is proposed. Results showed that the slenderness ratio of 35 was the dividing point between the strength and instability failures of the CSIM axially compressed component, and the calculated value of the revised bearing capacity calculation method agreed with the test value. The result is very close to the American National design specification for wood construction (ANSI/AF&PA NDS, 2005).","PeriodicalId":23841,"journal":{"name":"WOOD RESEARCH 67(1) 2021","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81564661","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}
Pub Date : 2022-01-16DOI: 10.37763/wr.1336-4561/67.1.96108
Fais Rahman, G. Lukmandaru
Teak wood is used at the juvenile stage due to short-rotation, therefore, this study aims to describe the extractive content of stem, bark, branch, and twig parts of the wood as value-added chemicals from secondary metabolites. Moreover, the main stems comprise of sapwood, heartwood, and bark while the branch and twig are made of sapwood together with bark. In this study, the sample trees were 6 and 8 years old with three replications from clonal superior teak wood andwere extracted using n-hexane, methanol, and hot water as the solvents. The average of n-hexane, methanol, hot water, and total extractives ranged from 0.49 to 2.77%, 2.27 to 17.76%, 0.65 to 7.47%, and 5.96 to 25.40%, respectively. Furthermore, the total phenolic content from soluble n-hexane and methanol extracts ranged from 162.16 to 295.24 mg GAE/g, while the total soluble polysaccharides ranged from 166.28 to 423.97 mg GluE/g. The results showed that the 8-year-samples had higher values in methanol extractive content (MEC) and lower in hot-water extractive content (HWEC) than the 6-year-old trees. In addition, the bark together with sapwood in branch and twig parts had higher concentrations of MEC and total extractive content (TEC) compared to the main stems. For radial direction, MEC, HWEC, and TEC levels were greater in bark than in other parts. The branch and twig parts also had higher phenolic concentrations compared to the main stem at the base part. Meanwhile, the sapwood at the branch and twig parts have higher total soluble polysaccharide concentration compared to the main stem.
{"title":"EXTRACTIVE CONTENTS OF THE JUVENILE STEMWOOD AND BARK OF TEAK","authors":"Fais Rahman, G. Lukmandaru","doi":"10.37763/wr.1336-4561/67.1.96108","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.1.96108","url":null,"abstract":"Teak wood is used at the juvenile stage due to short-rotation, therefore, this study aims to describe the extractive content of stem, bark, branch, and twig parts of the wood as value-added chemicals from secondary metabolites. Moreover, the main stems comprise of sapwood, heartwood, and bark while the branch and twig are made of sapwood together with bark. In this study, the sample trees were 6 and 8 years old with three replications from clonal superior teak wood andwere extracted using n-hexane, methanol, and hot water as the solvents. The average of n-hexane, methanol, hot water, and total extractives ranged from 0.49 to 2.77%, 2.27 to 17.76%, 0.65 to 7.47%, and 5.96 to 25.40%, respectively. Furthermore, the total phenolic content from soluble n-hexane and methanol extracts ranged from 162.16 to 295.24 mg GAE/g, while the total soluble polysaccharides ranged from 166.28 to 423.97 mg GluE/g. The results showed that the 8-year-samples had higher values in methanol extractive content (MEC) and lower in hot-water extractive content (HWEC) than the 6-year-old trees. In addition, the bark together with sapwood in branch and twig parts had higher concentrations of MEC and total extractive content (TEC) compared to the main stems. For radial direction, MEC, HWEC, and TEC levels were greater in bark than in other parts. The branch and twig parts also had higher phenolic concentrations compared to the main stem at the base part. Meanwhile, the sapwood at the branch and twig parts have higher total soluble polysaccharide concentration compared to the main stem.","PeriodicalId":23841,"journal":{"name":"WOOD RESEARCH 67(1) 2021","volume":"175 3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77364171","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}
Pub Date : 2022-01-16DOI: 10.37763/wr.1336-4561/67.1.0110
Jingjing Li, Xi Ma, Haiyan Duan
In order to improve the additional values of Salix psammophilabio-waste, pyroligneous acids (PAs) from Salix psammophila branches were extracted by thepyrolysis process at two temperature ranges: 90-380°C and 380-550°C. The chemical constituents and antimicrobial activities of PAs were investigated in detail. The GC-MS results showed that 34 compounds were identified from the two kinds of PAs. The main components were organic acids and ketones for PA at 90-380°C, while they were organic acids and phenols for PA at 380-550°C. The total content ofacids and phenols was as high as 67.96% for PA at 380-550°C, which contributed to the strong antimicrobial activity. Two PAs both showed good antimicrobial activities for five pathogenic fungi and two pathogenic bacteria, especially against Verticillium dahlia.Compared with the antimicrobial activity of PA at 90-380°C, PA at 380-550°C showed greater antifungal activity but against Fusarium oxysporum.
{"title":"PREPARATION, CHEMICAL CONSTITUENTS AND ANTIMICROBIAL ACTIVITY OF PYROLIGNEOUS ACIDS FROM SALIX PSAMMOPHILA BRANCHES","authors":"Jingjing Li, Xi Ma, Haiyan Duan","doi":"10.37763/wr.1336-4561/67.1.0110","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.1.0110","url":null,"abstract":"In order to improve the additional values of Salix psammophilabio-waste, pyroligneous acids (PAs) from Salix psammophila branches were extracted by thepyrolysis process at two temperature ranges: 90-380°C and 380-550°C. The chemical constituents and antimicrobial activities of PAs were investigated in detail. The GC-MS results showed that 34 compounds were identified from the two kinds of PAs. The main components were organic acids and ketones for PA at 90-380°C, while they were organic acids and phenols for PA at 380-550°C. The total content ofacids and phenols was as high as 67.96% for PA at 380-550°C, which contributed to the strong antimicrobial activity. Two PAs both showed good antimicrobial activities for five pathogenic fungi and two pathogenic bacteria, especially against Verticillium dahlia.Compared with the antimicrobial activity of PA at 90-380°C, PA at 380-550°C showed greater antifungal activity but against Fusarium oxysporum.","PeriodicalId":23841,"journal":{"name":"WOOD RESEARCH 67(1) 2021","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87070497","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}
Pub Date : 2022-01-16DOI: 10.37763/wr.1336-4561/67.1.2640
J. Gigac, M. Fišerová
The methods of coatedpaperboards smoothing witha hot stamping machine using asmooth metal die and a conventional calender were compared. The printing roughness required for printing electrical and electronic components was achieved by both smoothing methods. The printing roughness of the coated paperboards decreased after hot stamping by18to 42% and after calendering by 22 to 41% depending on the grade of coated paperboard. Thestiffness of coated paperboards decreased after hot stamping by only 4 to 21%, while by up to 38to 51% after calendering. The ratio of specific stiffness and printing roughness of coated paperboards after hot stamping ranged from 2.5 to 8.1 mN.μm-2and after calendering from 2.0to 6.7 mN.μm-2. The stiffness of the coated paperboards decreased less after hot stamping, and that only in the printed electronics area, while after calendering the stiffness decreased significantly more in the whole profile. It can be assumed that packaging made from coated paperboards smoothed by hot stamping will have a lower weight and thus lower costs than packaging from calendered coated paperboards.
{"title":"EFFECT OF SMOOTHING IN CALENDER AND HOT STAMPINGMACHINE ONTHE PROPERTIES OF COATED PAPERBOARDS FORPRINTED ELECTRONICS","authors":"J. Gigac, M. Fišerová","doi":"10.37763/wr.1336-4561/67.1.2640","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.1.2640","url":null,"abstract":"The methods of coatedpaperboards smoothing witha hot stamping machine using asmooth metal die and a conventional calender were compared. The printing roughness required for printing electrical and electronic components was achieved by both smoothing methods. The printing roughness of the coated paperboards decreased after hot stamping by18to 42% and after calendering by 22 to 41% depending on the grade of coated paperboard. Thestiffness of coated paperboards decreased after hot stamping by only 4 to 21%, while by up to 38to 51% after calendering. The ratio of specific stiffness and printing roughness of coated paperboards after hot stamping ranged from 2.5 to 8.1 mN.μm-2and after calendering from 2.0to 6.7 mN.μm-2. The stiffness of the coated paperboards decreased less after hot stamping, and that only in the printed electronics area, while after calendering the stiffness decreased significantly more in the whole profile. It can be assumed that packaging made from coated paperboards smoothed by hot stamping will have a lower weight and thus lower costs than packaging from calendered coated paperboards.","PeriodicalId":23841,"journal":{"name":"WOOD RESEARCH 67(1) 2021","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74765626","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}
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