Nonlinear resonance reflection from and transmission through a dense glassy system built up of oriented linear Frenkel chains: two-level models

A theoretical study of the resonance optical response of assemblies of oriented short (as compared to an optical wavelength) linear Frenkel chains is carried out using a two-level model. We show that both transmittivity and reflectivity of the film may behave in a bistable fashion and analyze how the effects found depend on the film thickness and on the inhomogeneous width of the exciton optical transition.Comment: 26 pages, 9 figure

Fingerprints of Large-Scale Landslides in the Landscape of the Emilia Apennines

Impressive depletion and accumulation landforms created by the millennial evolution of large-scale landslides are distinctive features of the landscape of the Emilia Apennines (Northern Italy). They are complex earth slides and earth flows that can be tens of hectares wide and can involve millions of cubic metres of clayey deposits originated by the failure and weathering of weak rocks such as clayey flysch and mélanges. These landslides have originated in large number since the upper Pleistocene. It is estimated that they now cover up to 20% of the mountain areas of the region. They typically alternate periods of dormancy that can be centuries long, to periods of reactivation that can last for a single season or several years. Upon reactivation, they rejuvenate landforms that outstand impressively from the surrounding landscape and cause severe damages to infrastructures. The chapter presents some relevant examples of these landslides and related hazard and risk issues

Study of Effectiveness of Treatment by Nanolime of the Altered Calcarenite Stones of the Archeological Site of Volubilis Site (Morocco)

International audienc

Gewaesserschutz am Bruchgraben - Rahmenplan zur wasserwirtschaftlichen Bewirtschaftung und naturnahen Gestaltung des Bruchgrabens und seiner Zufluesse. - Untersuchung stehender Gewaesser in Niedersachsen auf anthropogene Versauerung. - Massnahmen zur Verringerung der Grundwasserbelastung in Wasserschutzgebieten - Verminderung der Nitrateintraege. - Erkunden, Bewerten und Sanieren von Altstandorten. - Gedanken zur Beurteilung von Baggergut bei Umlagerung/Ablagerung im und aussehalb des Gewaessers. - Phosphor- und Stickstoffelimination in niedersaechsischen Klaeranlagen

Available from TIB Hannover: RO 9285(2)+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman