2,259 research outputs found
Conclusion
No full textÀ la fin des années 1980, la création de la holding familiale et la délégation du pouvoir unique à G. Grosdidier évitent une éventuelle dispersion de la propriété. Quant à la consolidation industrielle des sites de production, elle offre une surface technique et financière qui différencie l’entreprise des petits établissements sans moyens et des groupes disparates qui se bâtissent pour faire face à l’internationalisation des échanges. « Chance ou bonne gestion ? » (Müller, 1996, p. 19-47). E..
III. De l’homme providentiel à la direction collégiale
No full textDans son analyse sur l’attitude vis-à-vis du risque de l’entreprise familiale, S. Basly décrit la recherche d’équilibre comme partagée entre la poursuite de la croissance par le choix d’investissements risqués assurant la pérennité de l’activité et l’aversion naturelle au risque pour protéger le patrimoine (Basly, 2006, p. 16). Dans cette logique, la stratégie de G. Grosdidier établie sur le risque dans les années 1980 devient plus prudente lors de la décennie suivante. Certes, de lourds pro..
III. La croissance externe 1975-1986
No full textSi l’achat de la première Disamatic permet à l’entreprise de franchir une étape capitalistique, l’implantation d’une seconde machine affirme la stratégie d’expansion de G. Grosdidier. Sa propension à motiver les salariés et à prendre des risques, sa capacité de financer le développement de l’entreprise et à assurer l’optimisation des moyens de production, placent La Fonte Ardennaise sur une trajectoire ascendante. En règle générale, la croissance interne (réponse au succès de la démarche com..
Spin-state dependence of electrical resistivity and thermoelectric power of molten Al-Mn alloys: Experiment and theory
No full textInternational audienceWe present experimental measurements of resistivity and thermoelectric power of liquid alloys, Al1-x -Mn-x, (x = 0.12, 0.14, 0.16, 0.18, 0.20). The resistivity increases from 28.88 mu Omega cm for pure aluminum to 123.3 mu Omega cm for the alloy. No resistivity extremum is observed near the Mn concentration x = 0.14, in contrast to that observed in the quasi-crystalline state. At 1323 K. The temperature coefficient of the experimental resistivity is found to have a minimum value in the near vicinity of x = 0.16. For all these five compositions the thermoelectric power is negative and does not display any anomaly. Also we have proposed theoretical model, based on Faber Ziman formalism, to calculate both resistivity and the thermoelectric power. The neutron scattering experiment on Al0.80Mn0.20 liquid alloy confirmed that the effective spin of Manganese atoms had a mean value around 1 and that the Manganese could exist in two states of different magnetic moments. By minimizing the energy of the spin flip, we demonstrated the fact that Manganese appears in Al1-xMnx alloys as a mixture of Manganese atoms of spin 1/2 and 3/2 in proportions equal to 7/12 and 5/12, respectively. The Manganese atoms with one spin value different of zero may be considered as a binary alloy (B. Grosdidier, A. Ben Abdellah, K. Bouziane, S. M. Mujibur Rahman and J. G. Gasser, Phil. Mag. 93 no 26 (2013) p. 3576.) owing to the spin dependence of the exchange and correlation. In this work, we treated Manganese with its two spin values as a quaternary alloy. Consequently, in our calculations, we treated Al-Mn as five component alloys. This allowing us to extend the Faber Ziman formalism originally designed for a binary alloy to a five-component formalism. Our theoretical results are in fairly good agreement with our experimental values which validates the assumptions of our model
Setting-up rules to characterize microsegregation
No full textCharacterization of chemical heterogeneities such as microsegregation resulting from solidification of metallic alloys is most often performed by EDS or WDS microanalysis with spot measurements located at corners of a regular grid. Rather than attempting a theoretical treatment of the statistics of such analyses, the quality of the procedure has been investigated by implementing “measurement” grids on numerical images that mimic solidification structures. Microstructures either with no geometrical constraints (uniform distribution of the solid nuclei) or with limited constraints that give some periodicity have been investigated. Systematic analysis of the effect of the location and size of the “measurement” grid enlightens the procedures which should be followed to minimize bias
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