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Registros recuperados: 10
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A new experimental device for rapid measurement of the trunk equivalent modulus of elasticity on standing trees Inra
Launay, J.; Rozenberg, P.; Pâques, L. E.; Dewitte, J.M..
Un nouveau dispositif destiné à la mesure du module d’élasticité des arbres sur pied a été mis au point. Après l’avoir testé sur des poutres en acier et en aluminium, ila été comparé à un autre appareillage construit sur le modèle de celui proposé par Koizumi. Des essais à grande échelle sur des plantations de douglas (72 arbres) et de mélèzes (292 arbres) ont montré que ce dispositif permet de mesurer rapidement les caractéristiques mécaniques d’une population d’arbres assez jeunes (moins de 20 ans) et d’effectuer efficacement une sélection en prenant en compte ce critère parmi d’autres.
Tipo: Journal Article Palavras-chave: ELASTICITE; MODULE D'ELASTICITE; ARBRE SUR PIED; RIGIDIMETRE; MESURE; PROPRIETE MECANIQUE ELASTICITY; MODULUS OF ELASTICITY; STANDING TREE; MEASUREMENT; MECHANICAL PROPERTIES; GENETICS; DOUGLAS FIR; LARCH.
Ano: 2000 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20076a959fe6&uri=/notices/prodinra1/2009/12/
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Amélioration de l’autonomie alimentaire des élevages de ruminants : conséquences sur les fonctions de production et la longévité des femelles Inra
Blanc, F.; Bocquier, F.; Agabriel, J.; D'hour, P.; Chilliard, Y..
En élevage de ruminants, l’amélioration de l’autonomie alimentaire peut être obtenue non seulement par unelimitation des intrants et une amélioration de la qualité et de la quantité des fourrages et concentrés produits sur l’exploitation,mais également par le pilotage des fonctions de production des animaux dans un contexte de sous-alimentation / ré-alimentation.Dans ces situations devenues plus contraignantes, la productivité des systèmes d’élevage repose sur la capacité des animaux àmaintenir leurs niveaux de production (priorités relatives entre fonctions à un stade physiologique donné), à mettre en oeuvredes phénomènes de rebond (mécanismes compensateurs : croissance compensatrice, reconstitution des réserves) et àsauvegarder leur processus de...
Tipo: Conference Paper Palavras-chave: BILAN NUTRITIONNEL; COMPOSANTE PHYSIOLOGIQUE; SOUS-NUTRITION; CYCLE DE PRODUCTION; CONTRAINTE ALIMENTAIRE; ELASTICITE; PILOTAGE DYNAMIQUE; APTITUDE A LA REPRODUCTION.
Ano: 2004 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200738b4ac9a&uri=/notices/prodinra1/2008/09/
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Détermination des propriétés élastiques d'éléments individuels du plan ligneux du chêne par des essais de traction sur micro-éprouvettes Inra
Badel, E.; Perré, P..
Determination of the elastic properties using tensile tests on micro-samples for different anatomical elements for oak. This work proposes elastic values measured in the cross section of wood for different anatomical elements of oak. The experimental device, conceived and developed in our laboratory, allows the Young's modulus and Poisson's ratio to be determined on very small samples. In this work, four components of the anatomical pattern have been differentiated. The corresponding micro samples have been prepared by careful polishing, which is difficult at best. Finally, we are able to propose values for ray cells, longitudinal parenchyma cells, initial ring porous zone and fibres. The ray cells depict the highest rigidity in the transverse plane. On...
Tipo: Journal Article Palavras-chave: BOIS DE FEUILLUS; PROPRIETE MECANIQUE; ELASTICITE; MESURE; METHODE; ANATOMIE DU BOIS.
Ano: 1999 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0000028622080382&uri=/notices/prodinra1/2010/01/
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Elastic layer thickening with age of the oceanic lithosphere : a tool for prediction of the age of volcanoes or oceanic crust IRD
Calmant, Stéphane; Francheteau, J.; Cazenave, A..
Tipo: Text Palavras-chave: GEOLOGIE STRUCTURALE; LITHOSPHERE; VOLCAN; CROUTE OCEANIQUE; DATATION; MODELE MATHEMATIQUE; ELASTICITE.
Ano: 1990 URL: http://www.documentation.ird.fr/hor/fdi:34824
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Genetic control of stiffness of standing Douglas fir ; from the standing strem to the standardised wood sample, relationships between modulus of elasticity and wood density parameters (part 2) Inra
Rozenberg, P.; Franc, A.; Mamdy, C.; Launay, J.; Schermann, N.; Bastien, J.C..
Tipo: Journal Article Palavras-chave: ELASTICITE; DENSITE.
Ano: 1999 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9900002184074984&uri=/notices/prodinra1/2009/12/
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Genetic control of stiffness of standing Douglas fir;from the standing stem to the standardised wood sample, relationships between modulus of elasticity and wood density parameters (part 1) Inra
Mamdy, C.; Rozenberg, P.; Franc, A.; Launay, J.; Schermann, N.; Bastien, J.C..
Tipo: Journal Article Palavras-chave: ELASTICITE; DENSITE.
Ano: 1999 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9900002181074981&uri=/notices/prodinra1/2009/12/
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Notions de biopolymères. Approches théoriques et applications agronomiques Inra
Monties, B..
Tipo: Lecture Palavras-chave: MATIERE PLASTIQUE; VISCOSITE; ELASTICITE; PROPRIETE RHEOLOGIQUE; FIBRE CELLULOSIQUE; GLUTENINE; MACROMOLECULE; TRANSITION D'ETATS; POLYMOLECULARITE.
Ano: 1999 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0100002198086680&uri=/notices/prodinra1/2011/05/
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Predicting oak wood properties using X-ray inspection: representation, homogeneisation and localisation. Part I: digital X-ray imaging and representation by finite elements Inra
Badel, E.; Perré, P..
This paper is the first part of a complete modelling where wood is a 2D composite material. It proposes a comprehensive approach to predict the elastic and shrinkage properties of oak wood in the transverse plane from the local properties of the anatomical tissues and the actual morphology of those tissues. Part I is devoted to the methodology of representation. According to oak anatomy, the representative elementary volume used in this work consists of one annual ring limited in the tangential direction by large zones of ray cells. A high-resolution digital X-ray imaging device was built to represent the spatial distribution of tissues directly from cross-sections of wood. A complete image processing, including image segmentation and partitioned...
Tipo: Journal Article Palavras-chave: BOIS DE FEUILLUS; ANATOMIE DU BOIS; PROPRIETE MECANIQUE; ELASTICITE; RETRAIT.
Ano: 2002 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0400029165104290&uri=/notices/prodinra1/2010/01/
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Predicting of oak wood properties using X-ray inspection: representation, homogenisation and localisation. Part II: computation of macroscopic properties and microscopic stress fields Inra
Perré, P.; Badel, E..
This paper is the second part of a comprehensive approach that allows the elastic and shrinkage properties of oak to be determined from the properties of the anatomical tissues and the spatial distribution of those tissues, obtained by a high resolution digital X-ray imaging device. The computation of the macroscopic properties employs a 2-D numerical tool, called MorphoPore, that utilises periodic homogenisation over the representative volume. The paper starts with the derivation of the mechanical formulation and analyses the effect of mesh refinement on the overall solution quality. Thereafter, a first example is presented that depicts the effect of fibre proportion and fibre zone shape on the macroscopic properties using a virtual anatomical pattern and...
Tipo: Journal Article Palavras-chave: HOMOGENEISATION; CALCUL NUMERIQUE; BOIS DE FEUILLUS; PROPRIETE MECANIQUE; RETRAIT; ELASTICITE.
Ano: 2003 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0400029164104289&uri=/notices/prodinra1/2010/01/
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Rapid measurement of trunk MOE on standing trees using RIGIDIMETER Inra
Launay, J.; Ivkovitch, M.; Pâques, L.; Bastien, C.; Higelin, P.; Rozenberg, P..
Tipo: Journal Article Palavras-chave: RIGIDIMETRE; MODULE D'ELASTICITE; TRONC; ARBRE SUR PIED; METHODE D'AMELIORATION GENETIQUE; MESURE; ELASTICITE; PROPRIETE MECANIQUE; ECORCE.
Ano: 2002 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0300000629097331&uri=/notices/prodinra1/2009/12/
Registros recuperados: 10
Primeira ... 1 ... Última
 

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