Les « sols construits »

Distribution et mobilité de l’arsenic dans les sols: Effets de cycles redox successifs

....................................................................................................................................... 1 Processes affecting redox conditions in near surface soils and sediments ................................. 1 Oxygen transport from to the subsurface ................................................................................ 1 Anaerobic metabolism of org...

Block-in-matrix structure – tunneling in hard soil and/or weak rock Structure blocs-en-matrice – construction de tunnels dans les sols indurés et/ou les roches tendres

The city bypass tunnel of Waidhofen an der Ybbs (Austria) is situated in an intricate geological-geotechnical complex consisting of soil, hard soil, weak rock and solid rock. Marls and marly limestone (Waidhofener formation) predominate followed by tectonic breccia of the Alpine cliff zone, which is a tectonic melange zone. Materials of this kind universally have isolated interior blocks (shade...

Etude Algorithmique de Réseaux Construits avec la Forme Trace

Preparation of Colloidal Sols and Gels Objective

Colloidal suspensions are used to generate polymers or particles from which ceramic materials can be made by the sol-gel process. The precursors for preparation of a colloidal suspension consist of a metal element surrounded by various ligands (attached groups not including another metal). For example, common precursors for sol-gel synthesis of aluminum oxide include inorganic salts such as Al(...

Molecular structures in biopolymers sols and gels

The short range molecular structure of ogarose in the sol state and r-carrageenans in the gel state have been investigated by small-angle neutron scattering (0.1< q(nm'l) < 2.5). Agarose in the sol state possesses a rod-like conformation (minimum persistence length of 14 nm) with a mass per unit length consistent with a single helm The existence of a double helix in the gel state is accordingly...