4 research outputs found
Modélisation des matériaux supraconducteurs, application à un limiteur du courant
Get PDFCe travail est une contribution à l’étude et a la modélisation tridimensionnelle des phénomènes électromagnétiques et thermiques dans les matériaux supraconducteurs à haute température critique, appliqué pour la limitation du courant de court circuit. La méthode des volumes finis à été adoptée comme méthode de résolution des équations aux dérivées partielles caractéristiques aux phénomènes physiques a traité. Les différents résultats électromagnétiques et thermiques ont été largement présentés
Variations in ring width density and tracheid morphology of tamarack wood (Larix laricina)
Get PDFThe tree genetic improvement programs focus on tree growth with little attention to wood quality despite determining the potential of wood for various applications. This study investigated the intra-ring and intra-tree variations of wood growth, density, tracheid length and width of Larix laricina trees and estimated their quantitative genetic parameters of a 30-year-old progeny test using destructive and nondestructive samplings.
The average ring density was 491 kg/m³. The proportion of latewood remains uniform and constant within the tree at about 24%. The tracheids were fine and long, averaging 25 µm in diameter and 2.23 mm in length for earlywood and 25 µm in diameter and 2.55 mm in length for latewood. The cambial age has a significant effect on almost all wood properties. A positive and significant phenotypic and genotypic correlation between density components was found for juvenile and mature wood. Tracheid morphological properties were positively correlated with each other and negatively correlated with wood density and growth components, except for earlywood density. Heritability estimates indicate that wood density components were under moderate to strong genetic control. These results showed that wood quality traits are important selection criteria for breeding programs to improve wood quality while maintaining a high growth rate.The presentation of the authors' names and (or) special characters in the title of the pdf file of the accepted manuscript may differ slightly from what is displayed on the item page. The information in the pdf file of the accepted manuscript reflects the original submission by the author
The Numerical Results of the Magnetic Behavior of the Thin-layers SFCL
No full textIn this paper, we present some numerical results of the magnetic behavior of superconducting fault current limiters (SFCLs). The numerical problem of this study is solved using the method of volume control (CVM). The electromagnetic and thermal coupling is ensured by an alternative algorithm. To describe the relationship between the electric field and the current density inside the thin-film superconductor, we chose to use the power law model widely used in simulation work.Â
The Numerical Results of the Magnetic Behavior of the Thin-layers SFCL
No full textThe performance of superconducting current limiters associating the short-circuit phenomenon depends on the structure of the superconducting material envisaged and on the way of inserting it into the electrical network. Â In this paper, we present some numerical results of the magnetic behavior of superconducting fault current limiters (SFCLs). To describe the relationship between the electric field and the current density inside the thin-film superconductor
