Analyzing the effects of vertical acceleration and deceleration in multi-phase, debris-flow sediment-column experiments / by Christine Marie Williams.

Water-saturated debris flows are among some of the most destructive mass movements. Their complex nature presents a challenge for quantitative description and modeling. In order to improve understanding of the dynamics of these flows, it is important to seek a simplified dynamic system underlying their behavior. Models currently in use to describe the motion of debris flows employ depth-averaged equations of motion, typically assuming negligible effects from vertical acceleration. However, in many cases debris flows experience significant vertical acceleration as they move across irregular surfaces, and it has been proposed that friction associated with vertical forces and liquefaction merit inclusion in any comprehensive mechanical model. The intent of this work is to determine the effect of vertical acceleration through a series of laboratory experiments designed to simulate debris flows, testing a recent model for debris flows experimentally. In the experiments, a mass of water-saturated sediment is released suddenly from a holding container, and parameters including rate of collapse, pore-fluid pressure, and bed load are monitored. Experiments are simplified to axial geometry so that variables act solely in the vertical dimension. Steady state equations to infer motion of the moving sediment mass are not sufficient to model accurately the independent solid and fluid constituents in these experiments. The model developed in this work more accurately predicts the bed-normal stress of a saturated sediment mass in motion and illustrates the importance of acceleration and deceleration.

Motifs slaves dans les lettres autrichiennes du XIXe siècle: tentative de compréhension et de synthèse dans le cas de Marie von Ebner-Eschenbach

Marie von Ebner-Eschenbach (1830-1916) was born and grew up in Moravia. Despite the fact that her very first language was Czech, all her literary work was written in German ; despite of her Czech origins from her fatherside, all the references to be found in her work concerning the social and national development of the Czech society of that time express, if not animosity, at least a total lack of understanding. Everthing happens as if the author just wanted to confirm and uphold the official views of the Austrian Monarchy. In this article, I’d like to show, mainly on the example of the novel Božena (1876), that a more careful reading which would take into account not only the textual statements of the writer, but as well the composition of the plot and the various behaviors of the Czech and German protagonists, could allow to bring nuances to Ebner-Eschenbach’s position towards the Czech – namely to see that she was perfectly aware and respectful of the cultural diversity and complexity of the Czech lands and that she felt a deep compassion for the claims of the minorities asking for the transformation of the Habsburg Empire into a Federation of free nations.

Feyerliche Einweihung der Synagoge in München den 21. April 1826

Teilw. in hebr. Schr. u. Sprache

Uit de geschiedenis der Groote Synagoge der Hoogduitsch-Joodsche Gemeente te Amsterdam in de jaren 1768-1814

von D. M. Sluys