Scientific talk: "Financial networks, systemic risk, and early-warning signals", given by Dr. Diego Garlaschelli, of the Institute Lorentz, on Friday the 24th of April at 16:00 in room L214.
More info LCN2 website
Publ. 24-04-2015 11:23
NeVac prize 2015 awarded to Jaap Kautz and Johannes Jobst
Rigidity Loss in disordered systems; Three Scenarios
Disordered packings of soft particles and disordered collections of coupled springs are models for materials as diverse as foams, emulsions, sand and (bio)polymer networks. For all these, the network of More info
contacts or connections governs their mechanics, and both classes of materials lose rigidity when the connectivity becomes too low. By comparing networks that are at the verge of failure, we uncover that packings exhibit a very strong response to the addition or removal of only one bond: every connection is crucial. Adding one bond leads to a rigid state where all bonds carry a load, and removing one bond leads to he complete fragmentation leading to many tiny patches connected by freely moving hinges. In random networks such dramatic response is completely absent, and even novel types of networks constructed to mimic packings fail to capture the unusual level of structural self-organization in sphere packings.
These insights can contribute to improved designs of network materials: if every element optimally participates in bearing loads, one can maximize e.g. the strength-to-weight ratio.
M.A. van Spronsen, G.J.C. van Baarle, C.T. Herbschleb, J.W.M. Frenken, I.M.N. Groot (2015) High-pressure operando STM studies giving insight in CO oxidation and NO reduction over Pt(110), Catalysis Today, 244, 85-95. [Abstract][DOI][pdf]
Wouter G. Ellenbroek, Varda F. Hagh, Avishek Kumar, M.F. Thorpe, and Martin van Hecke (2015) Rigidity Loss in Disordered Systems: Three Scenarios, Physical Review Letters (Cover), 114, 135501. [pdf]
21 April, 12:30, De Sitterzaal
This Week's Discoveries Tim van Erven (MI): “Machine Learning as a Game Against Nature” Irene Groot (LION): “Caught in the act! Live observations of catalysts using scanning probe microscopy” Read more
22 April, 14:15, 173 Oort
Informal Seminar Dr.Ir. Jochem Baselmans (SRON Netherlands Institute for Speace Research, Utrecht): Quasiparticle dynamics in photon detection superconducting resonators
22 April, 15:00, Academy building, Rapenburg
Thesis Defense Shuo Mi - Instituut-Lorentz: “Signatures of majorana Zero-modes in Nanowires, Quantum Spin Hall Edges, and Quantum Dots” Promotor: Prof.dr. C.W.J. Beenakker, co-promotor: Dr. M.T. Wimmer (TUD)