29 research outputs found
Erarbeitung von Verfahren zur Herstellung neuartiger nanodispersionsverstaerkter Oberflaechenschichten Teilvorhaben des Eureca-Projektes 'Nadicoat' Nr. 2260. Abschlussbericht
SIGLEAvailable from TIB Hannover: F02B1488 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung, Berlin (Germany); European Union (Euro), Brussels (Belgium)DEGerman
First-principles study of elastic constants and interlayer interactions of complex hydrated oxides : case study of Tobermorite and Jennite
Nano-scale mechanics of colloidal C-S-H gels
Gels of calcium-silicate-hydrates (C-S-H) are the glue that is largely responsible for the mechanical properties of cement. Despite their practical relevance, their nano-scale structure and mechanics are still mainly unexplored, because of the difficulties in characterizing them in a complex material like cement. We propose a colloidal model to investigate the gel mechanics emerging in the critical range of length-scales from several tens to hundreds of nanometers. We show that the size polydispersity of the hydrates and size-dependent effective interactions can explain the mechanical heterogeneities detected in nano-indentation experiments. We also show how these features control the arising of irreversible structural rearrangements under deformation, which are good candidates as nano-scale mechanisms underlying mechanical aging and slow structural relaxation in the gels
Surface Chemistry and Atomic-Scale Reconstruction of Kerogen-Silica Composites
The interest in gas shale, a novel source rock of natural gas, has tremendously increased in recent years. Better understanding of the kerogen/rock interaction is of crucial importance for efficient gas extraction and hence for asset management. In this study, we explore the possible chemical bonds between kerogen and silica, one of the most predominant mineral constituents of gas shale by means of quantum chemistry. Energetically favorable bond formation reactions are found between alcoholic hy-droxyl, carboxylate and aldehyde groups as well as aliphatic double bonds of kerogen and the silica surface. The performance of a reactive force field is also assessed in a representative set of chemical reactions, which was found satisfactory. The potential impact of bond formation reactions between the two phases on the actual kerogen-silica interface are discussed in function of the kerogen type, maturity and density. Finally, a methodology aiming to reconstruct realistic kerogen-silica interfaces is presented
AI and model management: FAW research in environmental information systems
SIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman
Analyse der Leistungsfaehigkeit eines neuen Systems zur Auswertung aussagenlogischer Probleme Version 1
SIGLETIB: RO 9630(90003) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman
Umweltmonitoring: Modelle, Methoden und Systeme
Available from TIB Hannover: RO 9630(93013) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman
KomModul. Teilvorhaben: Extrem rauscharme und hocheffiziente Transceiverkomponenten Schlussbericht
SIGLEAvailable from TIB Hannover: F03B683+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung, Berlin (Germany)DEGerman
Bericht ueber die FAW-Expertenrunde CAD und KI
SIGLETIB: RO 9283(8804) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman