Event Archive

Localised buckling, writhing and cutting of the DNA molecule

Single–molecule tests on DNA in a magnetic tweezer experiment allow the molecule to be stretched and twisted. Under increasing twist the DNA buckles locally and forms a ply (plectoneme) which grows at right–angles to the loading axis. Interpreting this in terms of elastic–rod theory allows the estimation of important parameters...

Experiments on VIV under frequency modulation and at constant Reynold number

Normal vibration modes of a slender beam on elastic foundation with unilateral contact

Nonlinear normal vibration modes of a semi-infinite slender beam on elastic foundation with unilateral contact are addressed using the method of multiple scales.

Experimental unfolding and theoretical model in the transition to complex dynamic of a sagged cable

A good correlation between the experiments and theory allowed to unfold the complex forced dynamics of a sagged cable triggered by a divergence-Hopf codimension two bifurcation.

Catastrophic failures of energetic materials

Molecular Dynamics: Development Experience and General Trends

The Molecular Dynamics (MD) is a vast research field attempting to model natural phenomena on a wide span of length&time scales ranging from atomistic (angstrom: 10-10m) to tissue/material fragment(micrometer:10-6m) length scales as well as from picoseconds (QM/MM simulations) to microseconds (protein folding, membrane protein function) time scales.

Intermingling in ecology

Chaotic dynamical systems with two or more attractors lying on invariant subspaces may, provided certain mathematical conditions are fulfilled, exhibit intermingled basins of attraction: each basin is riddled with holes belonging to basins of the other attractors. In order to investigate the occurrence of such phenomenon in dynamical systems of...

Thermomechanical modelling of shape memory alloys

Gradient plasticity from the bottom up and the top down

"From the bottom up": The basic mechanism of plastic deformation is the generation and motion of dislocations.

Quality of service and the DVB return channel via satellite (DVB-RCS) standard

This presentation describes the challenges in providing a DVB-RCS two-way Internet satellite system that supports multiple classes of service. It examines the interaction of the control-loop presented by the Radio Resource Management (RRM), defined by the SatLabs Forum, in relation to the ETSI/BSM IntServ Quality of Service (QoS) model. It...