Continens Indicem Locupletissimum Rerum omnium notabilium, quæ in toto Opere continentur

Digitalisat der Ausgabe von 1760, erschienen 201

Amélioration de la connaissance du cycle de l'azote : synthèse sur l'importance et la localisation de la dénitrification

The goal of this study is, based on bibliographical research and meetings with scientists, to define and characterize denitrification, to analyze and critize measurement methods. Part of this work is dedicated to denitrification in open space environment and to what causes it, in order to reduce the nitrate pollution. / Cette étude se propose, à partir d'une recherche bibliographique et de rencontres avec des spécialistes, de définir et de caractériser la dénitrification, d'analyser et de critiquer les méthodes de mesure. Une partie est consacrée à la dénitrification dans les milieux naturels et à sa provocation en vue de réduire la pollution par les nitrates

Women, are we our own barriers when making careers?

The scarcity of female leaders rise curiosity to explore the reasons of the phenomenon. Many attempts have been done to explain the scarcity but somehow it seems that investigations explore the same factors and not what has been seen as a taboo; women’s feelings and thoughts towards each other as obstacles in making careers. Therefore is the aim of this study: to gain knowledge about women’s feelings and thoughts about other women in a corporate environment to be able to draw conclusions whether this matter can be a contribution to the debate concerning obstacles for women to climb in their career. This research is conducted through an inductive approach with eight qualitative interviews choosing both women leaders and non-leaders. Jealousy and envy between women were discovered, which do not seem to restrain or create obstacles for other women but only or mostly, to women having these feelings and thoughts. Jealousy and envy are just a symptom of the real problem which is poor selfconfidence in the corporate environment. We discovered a vicious circle which shows us the connection between jealousy, self-confidence, competition and success. The vicious circle could be an input to the debate to explain obstacles that women could meet in their path to leading positions. Women have to start believing in themselves with help of society where she is not directly or indirectly restrained for the fact of being a woman

Coloration macroscopique, retraits longitudinaux de maturation et de séchage du bois de tension du peuplier (Populus × euramericana cv I.214)

Macroscopic staining, longitudinal shrinkage and growth strains of tension wood of poplar (Populus x euramericana cv I.214). This study aims at characterizing distribution and properties of tension wood of poplar (clone I.214). First, the use of zinc chloroiodide for the macroscopic staining of tension wood was validated for poplar. Then, longitudinal growth strain and axial shrinkage were measured for both normal and tension wood. The staining revealed fine tangential strips of tension wood, closely corresponding to G fibres on microscopic slides (fig 5). The tension wood content, quantified by the stained surface ratio, was weakly correlated to the measurement of the longitudinal strain (fig 6). Tension wood shrinkage was greater than that of normal wood (5.6 vs 1.7%, table IV). Macroscopic staining evidenced rapid variations of wood structure within the transverse plane; this was confirmed by shrinkage measurements (figs 8 and 9). Moreover, rapid variations of longitudinal shrinkage along the fibre direction was observed, probably due to the location of our samples at the base of a fork.L'objectif est d'étudier la répartition et les propriétés du bois de tension du clone de peuplier I.214. Dans un premier temps nous avons validé le chloro-iodure de zinc comme colorant macroscopique du bois de tension. Par la suite, nous avons caractérisé la déformation longitudinale de maturation (à l'origine des contraintes de croissance) du bois de tension et étudié les différences de retrait longitudinal au séchage entre bois normal et bois de tension. Le colorant a révélé de fines bandes tangentielles qui correspondent exactement, sur coupes microscopiques, à des zones de fibres G. L'indice de bois de tension (proportion en surface de fibre G) n'est pas corrélé significativement à la mesure de déformation de maturation. Le retrait longitudinal du bois de tension est supérieur à celui du bois normal (5,6 contre 1,7 %). Les colorations macroscopiques témoignent de variations rapides de la structure du bois sur section transverse. Les mesures de retrait confirment ce résultat. Nous avons de plus observé une variation longitudinale rapide de ce retrait