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Tension Chord Model Modification for Uniaxial Unloading and Reloading in Elastic and Plastic States

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First principles study of substoichiometric germanium oxides

Alfredo Pasquarello, Peter Broqvist, Jan Felix Binder

Using density functional calculations, we studied substoichiometric Ge oxides through a series of crystalline models representing the various oxidation states. We evaluated deviations with respect to a bond-energy description in terms of penalty energies f ...

2009

Stabilization of bimolecular islands on ultrathin NaCl films by a vicinal substrate

Harald Brune, Marta Canas Ventura

The structure of ultrathin NaCl films on Au(1 1 1) and on Au(11 12 12), as well as the one of bimolecular 3,4,9,10-perylenetetracarboxylic diimide (PTCDI) and 1,4-bis-(2,4-diamino-1,3,5,-triazine)-benzene (BDATB) islands on NaCl films on both surfaces have ...

Elsevier2009

Long-range energy transfer in proteins

Francesco Piazza

Proteins are large and complex molecular machines. In order to perform their function, most of them need energy, e. g. either in the form of a photon, as in the case of the visual pigment rhodopsin, or through the breaking of a chemical bond, as in the pre ...

2009

The present research represents a theoretical and experimental contribution to the understanding of the structural behaviour of elements made of ultra-high performance fibre-reinforced concrete (UHPFRC). UHPFRC is investigated as an advanced cementitious m ...

EPFL2008

Analyse de l'état de contrainte et de l'endommagement d'assemblages sertis en matériau mixte métal-composite sollicités en traction ou en flexion

Alain Michel Prenleloup

The constant improvement of polymer composite materials has allowed their integration in many industrial fields where their mechanical and chemical properties are apparently attractive. Mixed metal-composite insulators are now increasingly used for high vo ...

EPFL2008

A re-evaluation of test data on bond in R/C by means of FEM modeling

Aurelio Muttoni, Miguel Fernández Ruiz, Pietro Gambarova

The role of various parameters governing bond behavior is investigated in this paper taking advantage of a simple but efficient finite-element model, whose fundamental aspects are briefly recalled. Several well-documented test results on bond are examined ...

Studi e ricerche, Starrylink, pub.2007

Interaction sol-structure dans le domaine des tranchées couvertes

Sylvain Plumey

The present research on cut-and-cover tunnels gives a theoretical contribution to the understanding of the behaviour of these structures up to their ultimate limit state. A simplified method inspired on the convergence-confinement method is investigated an ...

EPFL2007

[Pd(PPh3)4]/Cul served as an efficient catalyst for the reaction of three readily available starting materials to give 3-(diarylmethylene)indolin-2-ones, e.g., I, through a sequence of intermol. Sonogashira reaction/intermol. carbopalladation/C-H activatio ...

2007

Liquid dynamics in ZrO2 nanoporous films

Majed Chergui, Frank van Mourik, Erwin Portuondo Campa

Time-resolved Optical Kerr Effect (OKE) measurements were used to det. the orientational dynamics of water and acetonitrile in the bulk and in pores of ZrO2 nanostructured films. The expts. were performed with a home-built OKE microscope, capable of provid ...

2007

Footprints of deformation mechanisms during in-situ x-ray diffraction

Nanocrystalline metals have been an area of great interest in recent years due to their enhanced characteristics. One of the most striking is implied by the Hall-Petch relation: with decreasing grain size the material becomes stronger. This promise is fulf ...

EPFL2006