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Статті в журналах з теми "Noeuds du bois – Etude des":
May, P., and Roger Bessis. "Potentialités de croissance des differents types de bourgeons chez la vigne." OENO One 19, no. 2 (June 30, 1985): 81. http://dx.doi.org/10.20870/oeno-one.1985.19.2.1320.
Dietrich, Anne, and María-Eugenia Solari. "Serris-les-Ruelles Etude des bois gorgés d'eau et des charbons de bois." Bulletin de la Société Botanique de France. Actualités Botaniques 139, no. 2-4 (January 1992): 637–49. http://dx.doi.org/10.1080/01811789.1992.10827136.
Daudeville, Laurent, Luc Davenne, Nicolas Richard, and Naohito Kawaï. "Etude du comportement parasismique de structures à ossature en bois." Revue Française de Génie Civil 2, no. 6 (January 1998): 651–65. http://dx.doi.org/10.1080/12795119.1998.9692198.
Marmier‐Dussoubs, Danielle, Michel Mazet, and Joseph Pronost. "Etude de l'elimination de colorants par des charbons de bois." Environmental Technology 12, no. 7 (July 1991): 625–34. http://dx.doi.org/10.1080/09593339109385049.
Muntotombe Botonga, Ghislain, and Andy Mussa Kalambayi. "Etude analytique de l’exploitation forestière du bois d’œuvre dans le Territoire de Bikoro, (Province de l’Equateur, République démocratique du Congo)." Revue Congolaise des Sciences & Technologies 02, no. 01 (February 15, 2023): 169–75. http://dx.doi.org/10.59228/rcst.023.v2.i1.21.
Jodin, P. "Etude de poutres en bois lamellé-collé présentant des trous de réservation." Materials and Structures 38, no. 276 (January 21, 2005): 275–82. http://dx.doi.org/10.1617/13999.
Taleb, Rafik, Julien Baroth, Laurent Bodé, and Philippe Bressolette. "Etude par éléments finis stochastiques d'assemblages de poutres bois par tiges collées." Revue Européenne de Génie Civil 10, no. 5 (May 2006): 583–98. http://dx.doi.org/10.1080/17747120.2006.9692846.
LAPLANCHE, Karine. "Etude des assemblages de structures bois au feu. Approche expérimentale et modélisation." Revue Française de Génie Civil 8, no. 1 (January 2004): 122. http://dx.doi.org/10.1080/12795119.2004.9692583.
Hemati, M., and C. Laguerie. "Etude cinétique de la pyrolyse de bois à haute température en thermobalance." Chemical Engineering Journal 35, no. 3 (July 1987): 147–56. http://dx.doi.org/10.1016/0300-9467(87)85025-6.
Hemati, M., and C. Laguerie. "Etude Cinétique de la Pyrolyse de Bois à Haute Température en Thermobalance." Chemical Engineering Journal 35, no. 3 (July 1987): 157–68. http://dx.doi.org/10.1016/0300-9467(87)85026-8.
Дисертації з теми "Noeuds du bois – Etude des":
Bendahmane, Mohamed. "Etude du comportement mécanique du bois avec noeuds simulation numérique /." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37611789b.
Kebbi-Benkeder, Zineb. "Biodiversité interspécifique et intraspécifique des extractibles nodaux." Electronic Thesis or Diss., Paris, AgroParisTech, 2015. http://www.theses.fr/2015AGPT0072.
Wood is a renewable material used by man for construction, furniture, paper making, energy, etc. Wood contains extractives of great economic value which belong to various chemical families such as terpenes, flavonoids, tannins, etc. The knots (base of the branch embedded in the trunk) of some tree species are extremely rich in extractives.This study aims at analysing the inter-specific, intra-specific and within-tree variabilities of knotwood extractives to target the richest species, stations and tree parts. For that purpose, the knots of twenty-three species and those of fifteen firs grown under different conditions were extracted using several solvents and analysed. The results confirm the richness of knots compared to heartwood and sapwood for all species. Overall softwood knots contain mainly more extractives than hardwoods. The main compounds identified in softwoods are lignans, stilbenes, flavonoids and terpenes Gallic acid and flavonoids are present in hardwoods. The study of the vertical profile shows that concentrations decrease from the base of the crown to the tree tip. In addition, the results highlight the influence of growth conditions since dominant trees and/or those grown according to dynamic silvicultures are particularly rich in knot extractives. These results allow considering the valorization of wood industries by-products as bioactive molecules resource for various applications
Kebbi-Benkeder, Zineb. "Biodiversité interspécifique et intraspécifique des extractibles nodaux." Thesis, Paris, AgroParisTech, 2015. http://www.theses.fr/2015AGPT0072/document.
Wood is a renewable material used by man for construction, furniture, paper making, energy, etc. Wood contains extractives of great economic value which belong to various chemical families such as terpenes, flavonoids, tannins, etc. The knots (base of the branch embedded in the trunk) of some tree species are extremely rich in extractives.This study aims at analysing the inter-specific, intra-specific and within-tree variabilities of knotwood extractives to target the richest species, stations and tree parts. For that purpose, the knots of twenty-three species and those of fifteen firs grown under different conditions were extracted using several solvents and analysed. The results confirm the richness of knots compared to heartwood and sapwood for all species. Overall softwood knots contain mainly more extractives than hardwoods. The main compounds identified in softwoods are lignans, stilbenes, flavonoids and terpenes Gallic acid and flavonoids are present in hardwoods. The study of the vertical profile shows that concentrations decrease from the base of the crown to the tree tip. In addition, the results highlight the influence of growth conditions since dominant trees and/or those grown according to dynamic silvicultures are particularly rich in knot extractives. These results allow considering the valorization of wood industries by-products as bioactive molecules resource for various applications
Billard, Antoine. "Pour une valorisation optimisée de la biomasse forestière basée sur une connaissance de la variabilité de la masse volumique dans l’arbre." Electronic Thesis or Diss., Paris, AgroParisTech, 2021. http://www.theses.fr/2021AGPT0019.
Basic density is an important physical property of wood as it helps to explain the behaviour of the tree in situ and the wood in use. Currently, the databases containing mean wood basic density are mainly composed of mean stem wood calculated on core samples taken at 1.30 meters. Thus, variations in basic density within the stem, between components and within components are completely ignored. However, these variations can have an important impact on the calculation of wood aboveground biomass. Moreover, as bark and knots are components of the tree rich in extractives, it is important to know the available fraction of these components in order to test the feasibility of an extractives chemistry pathway. This thesis contributes to the ExtraFor_Est project, which aims to characterise and quantify the extractible resource of forests in the Grand Est and Bourgogne-Franche-Comté regions.In this thesis, three softwood and three hardwood species were studied: silver fir, Abies alba Mill., Norway spruce, Picea abies (L.) H. Karst., Douglas fir, Pseudotsuga menziesii (Mirb.) Franco, pedunculate oak, Quercus robur L., sessile oak, Quercus petraea L. and European beech, Fagus sylvatica L. For softwood species, trees were sampled in plots testing contrasting thinning intensities. In the end, only softwood species could be studied during the time of the thesis, but the other data were prepared for the continuation of the project. Four components of the tree were analysed: stem wood, stem bark, knots and branches. An X-ray tomograph was used to obtain the basic density of the components.In a first step, a comparison between the mean basic density of the stem wood measured at 1.30 m and the mean basic density of the studied components was carried out and the impact of the observed difference on the biomass calculation. It was found that the mean stem wood basic density measured at 1.30 m is significantly higher than the mean stem wood basic density for Abies alba and Pseudotsuga menziesii. Knots, branches and bark are mostly denser than stem wood measured at 1.30 m. These differences in basic density between components lead to an underestimation or overestimation of biomass depending on the component and the species studied, the difference being up to more than 40% for knots, for example.In a second step, the variation of basic density with height in the tree was analysed for stem wood. The results show that the direction of variation depends on the species. Two forms of descriptive models were developed for Abies alba and Pseudotsuga menziesii, one taking as input the mean basic density measured at 1.30 m and the other not taking it into account. The relative RMSEs for Abies alba and Pseudotsuga menziesii are 9.9% and 8.1%, respectively, for the model without the mean basic density measured at 1.30 m and 7.6% and 5.9%, respectively, for the model with the mean basic density measured at 1.30 m.Finally, the study of longitudinal and height-dependent variations in the basic density of stem bark, knots and branches was started. For bark, the basic density decreased with height for Abies alba, decreased and then increased for Picea abies and increased and then decreased slightly for Pseudotsuga menziesii. For branches, it was found that basic density decreases rapidly in the first 50 cm from their insertion on the stem and then remains stable until their apex
Chazelas, Jean-Louis. "Caractéristiques physiques et mécaniques locales du bois dans la zone des noeuds." Clermont-Ferrand 2, 1990. http://www.theses.fr/1990CLF21231.
Mburu, Francis. "Etude et valorisation de différents bois du Kenya." Nancy 1, 2007. http://docnum.univ-lorraine.fr/public/SCD_T_2007_0057_MBURU.pdf.
Prunus africana heartwood and sapwood were extracted using different solvents. Extractives were tested against fungi and termites in relation to the natural durability of Prunus africana. These were tested against Coriolus versicolor, Poria placenta, and Aureobasidium pullulans at concentrations. High inhibition was realized and increased with extract concentration. In some instances, fungal growth started after the control Petri dish was fully colonized showing fungistatic effect than fungicidal effect. Extracted and un-extracted wood samples were also tested against termites. When tested against Coriolus versicolor in the laboratory Prunus africana showed high natural durability. Extracted wood showed low resistance against termites while un-extracted was totally resistant. Dichloromethane extract showed the highest inhibition rate compared to water, acetone and toluene/ethanol extracts against fungi and termites. Microscopie analysis indicate the presence of important quantities of extractives deposited in the vessels which are removed after Soxhlet extraction. Spectroscopie and chromatographie analysis were investigated on dichloromethane extract to identify the compounds responsible for biological activities. Grevillea robusta was treated by cheap sap displacement method using Copper Chrome Arsenate (CCA). Results showed adequate penetration and retention for wood use in different hazard areas. Resistance of Greviflea robusta heat-treated samples was evaluated by malt agar block test against six wood rotting fungi a well as against termites in laboratory and field conditions. High durability against fungi and termites was realized after treatment. There was a positive correlation between decay resistance and mass loss due to thermal treatment. FTIR and 13C MAS NMR analysis showed chemical modification of wood components alte heat treatment
Bauer, Rodolphe. "La modélisation du volume des compartiments riches en composés chimiques extractibles (écorce et nœud) dans six essences d'intérêt des régions Grand-Est et Bourgogne Franche-Comté." Electronic Thesis or Diss., Paris, AgroParisTech, 2021. http://www.theses.fr/2021AGPT0025.
In a context of renewal of the chemical industry and the search for new outlets for forestry, extractives are becoming increasingly interesting molecules, both ecologically and financially speaking. In order to evaluate the relevance of these molecules as a new resource for the chemical industry and a potential outlet for forestry, it is necessary to make a preliminary evaluation of the resource. This requires knowledge of the volume of compartments rich in extractable material, particularly bark and knots. The present study therefore focuses on modeling bark and knot volumes. It focuses specifically on two French regions, the Grand Est and the Bourgogne-Franche-Comté, and on six important species, Abies alba, Picea abies, Pseudotsuga menziesii, Quercu robur, Quercus patraea, and Fagus sylvatica.This study is made possible, on one hand, by the use of a large database including numerous measurements of bark thickness made at different heights on the stems of many trees. On the other hand, new samplings have been made to allow X-ray scanning of nodes all along the stem and thus to determine precisely the volume on a computer picture.In order to model the available amount of bark, three types of models were built, models predicting the volume of bark, models predicting the surface area of bark along the stem and models predicting the thickness of bark at 1m30. The former achieved a relative root mean square error (RMSErel) of 16.7% to 27.5% depending on the species.The study of bark area models showed that it was possible to use a model independent of diameter-over-bark but that model using this variable are more accurate. The RMSErel achieved by these bark area models varied between 23 and 38% depending on the species and model considered.This work showed the importance of using the bark thickness at 1m30 as an input data. As it is rarely measured today, it was also modelled using the DBH. This allowed us to show the influence of altitude on bark thickness at 1.30 m for three species: Abies alba, Picea abies, Fagus sylvatica. The models obtained RMSErel of the models ranged from 26.8 to 36 % of RMSErel depending on the species considered.Finally, knot volumes have started to be studied. Although this work has not been fully completed, it already shows the importance of producing new models in order to fit the predicted knot patterns as closely as possible to reality. Moreover, the quantity of these compounds in the wood seems, at this stage of the study, to be too small to provide a large extractable resource, despite their great intrinsic richness. Their interest could therefore be more in the extraction of specific molecules
Mburu, Francis Gérardin Philippe. "Etude et valorisation de différents bois du Kenya Study and valorization of different Kenyan wood species /." [S.l.] : [s.n.], 2007. http://www.scd.uhp-nancy.fr/docnum/SCD_T_2007_0057_MBURU.pdf.
Dinkel, Olivier. "Etude et modélisation de l'endommagement d'un assemblage collé bois-bois sollicité en traction." Metz, 1997. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1997/Dinkel.Olivier.SMZ9706.pdf.
Joints, which are essential parts of timber structures, must be designed to support expected loads during the life of the structure. The scarf joint is present in many elements, mainly in glulam structures. The behaviour before fracture of such joints is the object of this study. The cumulated damage of the joint is followed during the loading. The joint is considered as composed from wood, wood+adhesive, adhesive. A number of damage tests has been made. These tests have been purchased till fracture occurs. It is deduced from them that the adhesive part is the only one which is damaged during the loading. The corresponding damage law is identified and the model is verified with a finite elements computation
DINKEL, OLIVIER Pluvinage Guy. "ETUDE ET MODELISATION DE L'ENDOMMAGEMENT D'UN ASSEMBLAGE COLLE BOIS-BOIS SOLLICITE EN TRACTION /." [S.l.] : [s.n.], 1997. ftp://ftp.scd.univ-metz.fr/pub/Theses/1997/Dinkel.Olivier.SMZ9706.pdf.
Книги з теми "Noeuds du bois – Etude des":
Ekoka, Christian Penda. Etude stratégique de la filière bois dans les pays membres de la CEEAC. [Vienna, Austria]: Organisation des Nations Unies pour le développement industriel, 1992.
Nouhaud, Dorita. Etude sur "Maladrón" de Miguel Angel Asturias: "Le bois dont on fait les croix". Paris: l'Harmattan, 1993.
Georges, Rakotovao. Etude papetière sur des bois de Madagascar: Influence de l'anthraquinone sur la cuisson papetière ; Blanchiment des pâtes. [Antananarivo]: Division technologie du bois, 1988.
ICOM Waterlogged Wood Working Group Conference (2nd 1984 Grenoble). Les bois gorges d'eau: Etude et conservation = : Waterlogged wood : study and conservation : proceedings of the 2nd ICOM Waterlogged Wood Working Group Conference. Grenoble: Centre d'Etude et de Traitement des Bois Gorgés d'Eau, 1985.
Baba, Ali. Etude Critique du Coran: Une Etude du Coran Sans Concession et Sans Langue de Bois. Lulu Press, Inc., 2017.
Baba, Ali. Etude Critique du Coran: Une étude du Coran Sans Concession et Sans Langue de Bois. Independently Published, 2017.
Ltd, ICON Group. SERIBO-STE ETUDE & REALISATIONS IND BOIS: International Competitive Benchmarks and Financial Gap Analysis (Financial Performance Series). 2nd ed. Icon Group International, Inc., 2000.
Ltd, ICON Group. SERIBO-STE ETUDE & REALISATIONS IND BOIS: Labor Productivity Benchmarks and International Gap Analysis (Labor Productivity Series). 2nd ed. Icon Group International, Inc., 2000.
Частини книг з теми "Noeuds du bois – Etude des":
Broise, Henri, and John Scheid. "Etude d’un cas : le lucus deae Diae à Rome." In Les bois sacrés, 145–57. Publications du Centre Jean Bérard, 1993. http://dx.doi.org/10.4000/books.pcjb.345.