- Published on 01 May 2013
A new study explores the counter-intuitive behaviour of a microgel composed of soft polymer blobs
Being a physicist offers many perks. For one, it allows an understanding of the substances ubiquitous in everyday industrial products such as emulsions, gels, granular pastes or foams. These are known for their intermediate behaviour between fluid and solid. Paint, for example, can be picked up on a paintbrush without flowing and spread under the stress of the brush stroke like a fluid. Baudouin Geraud and colleagues from the Light Matter Institute at the University of Lyon, France, have studied the flow of a microgel confined in microchannels. They have shown, in a study just published in EPJ E, that its behaviour under confinement differs from predictions based on standard theories. Indeed, its molecules are not only subjected to local forces, but also to neighbouring forces that affect its flow.
- Published on 01 May 2013
EPJ Plus welcomes Eugenio Nappi as co-Editor in Chief, alongside Luisa Cifarelli. Nappi is Director of Research at INFN, the Italian Istituto Nazionale di Fisica Nucleare. He is an experimental particle physicist who has carried out most of his research activities at CERN and DESY.
His main research interests include the study of heavy nucleus collisions at ultrarelativistic energies with the ALICE Experiment at LHC, where he held the highest managerial positions. In 2000, he became project leader of the Cherenkov system, named HMPID, the largest CsI Ring Imaging Cherenkov (RICH) detector ever built. In the same year he joined the HERMES experiment at HERA-DESY. In HERMES, he spearheaded the design of the first-ever aerogel radiator RICH detector. More recently, he has become interested in medical imaging and joined the AXPET collaboration at CERN, which is intended to develop a new concept for Positron Emission Tomography (PET).
Author of more than 250 peer-reviewed papers, he is a member of the Executive Board of INFN, the ICFA Panel on Instrumentation, the CST of CNRS-IPN Orsay, the ECE (Expert Committee for the Experiments) of FAIR and the STC (Steering Committee) OF ESS (European Spallation Source).
- Published on 23 April 2013
Earlier this year Francesco Guerra, who had been a member of the editorial board of EPJ H - Historical Perspectives on Contemporary Physics since its launch in 2010, joined Wolf Beiglböck in managing the journal.
Prof. Francesco Guerra, a graduate from the University of Naples, is full professor of theoretical physics at the University of Rome 'La Sapienza'. He has served on many national academic evaluation committees and is currently a member of the Physics Panel of the National Agency for the Evaluation of Universities and Research.
His scientific interests include quantum field theory and elementary particles, stochastic methods in quantum mechanics, stochastic variational principles, statistical mechanics of spin glasses and complex systems, and the history of modern physics (in particular nuclear physics). In 2008, he was the recipient of the Italian Physical Society’s Prize for History of Physics.
- Published on 17 April 2013
EPJE is inviting submission for a new topical issue on “Thermal non-equilibrium phenomena in multi-component fluids”. Under thermal non-equilibrium conditions, multi-component fluids generally undergo component separation. This is termed thermodiffusion in molecular liquids, and thermophoresis in colloidal fluids. The precise physical principles underlying these phenomena are still not understood, and it is envisaged that a continuous flow of ideas between theoreticians, experimental scientists and researchers employing numerical methods is needed to achieve a deeper understanding. In order to provide an overview of the more recent advances in this intriguing area, Fabrizio Croccolo and Henri Bataller will guest edit this topical issue on physical systems outside thermal equilibrium. The deadline for submission is 30 June 2014. Read the full call for papers to learn more about the scope and submission details.
- Published on 10 April 2013
Studying the effect of migration on cooperation could help to better understand social cohesion
Migrations happen for a reason, not randomly. A new study, based on computer simulation, attempts to explain the effect of so-called directional migration – migration for a reason – on cooperative behaviours and social cohesion. These results appear in a study just published in EPJ B by Hongyan Cheng from Beijing University of Posts and Telecommunications and colleagues.
- Published on 02 April 2013
This EPJB Colloquium reviews the pioneering studies of plasmon resonance in heavily doped semiconductor thin ﬁlms. It also reports the chemical synthesis and structural properties of heavily doped semiconductor nanocrystals. Their linear plasmonic response (under excitation with weak continuous-wave optical ﬁelds) is illustrated both theoretically and experimentally. Finally, the authors review the most recent results on the transient (i.e. nonlinear) ultrafast plasmonic features exhibited by chalcogenide nanocrystals under excitation with ultra-fast optical pulses, including a “gold-like” theoretical model. This model turns out to provide suﬃcient insights into the ﬁrst experiments on heavily-doped plasmonic nanoparticles.
Plasmonics in heavily-doped semiconductor nanocrystals. Francesco Scotognella et al., Eur. Phys. J. B (2013) 86: 154, DOI: 10.1140/epjb/e2013-40039-x
- Published on 27 March 2013
New research shows that the speed of light may not be fixed after all, but rather fluctuates
Two EPJ D papers challenge established wisdom about the nature of vacuum. In one paper, Marcel Urban from the University of Paris-Sud, located in Orsay, France and his colleagues identified a quantum level mechanism for interpreting vacuum as being filled with pairs of virtual particles with fluctuating energy values. As a result, the inherent characteristics of vacuum, like the speed of light, may not be a constant after all, but fluctuate. Meanwhile, in another study, Gerd Leuchs and Luis L. Sánchez-Soto, from the Max Planck Institute for the Physics of Light in Erlangen, Germany, suggest that physical constants, such as the speed of light and the so-called impedance of free space, are indications of the total number of elementary particles in nature.
- Published on 27 March 2013
Scientists have accurately calculated the sliding mechanism for deciphering the second genetic code written within the DNA base pair sequence
Three-quarters of the DNA in evolved organisms is wrapped around proteins, forming the basic unit of DNA packaging called nucleosomes, like a thread around a spool. The problem lies in understanding how DNA can then be read by such proteins. Now, Arman Fathizadeh, a physicist at Sharif University of Technology in Tehran, Iran, and colleagues have created a model showing how proteins move along DNA, in a paper just published in EPJ E.
- Published on 27 March 2013
A new study of animal swarms uncovers some new features of their collective behaviour when overcrowding sets in
Swarming is the spontaneous organised motion of a large number of individuals. It is observed at all scales, from bacterial colonies, slime moulds and groups of insects to shoals of fish, flocks of birds and animal herds. Now physicists Maksym Romenskyy and Vladimir Lobaskin from University College Dublin, Ireland, have uncovered new collective properties of swarm dynamics in a study just published in EPJ B. Ultimately, this could be used to control swarms of animals, robots, or human crowds by applying signals capable of emulating the underlying interaction of individuals within the swarm, which could lead to predicted motion patterns elucidated through modelling.
- Published on 17 March 2013
EPJE is now accepting submissions for a topical issue on “irreversible dynamics”, dedicated to Paul Manneville. The study of classical physics underwent a revolution in the 1970s-1980s thanks to seminal contributions by Ruelle, Takens, Pomeau and Manneville. The concurrent revival and extension of the theory of dynamical systems encompasses spatiotemporal chaos and coupled oscillator arrays. Applications to fluid dynamics range from pattern formation in convection, to the onset of turbulence in shear flows. The concurrent revival and extension of the theory of dynamical systems encompasses spatiotemporal chaos and coupled oscillator arrays. Applications to fluid dynamics range from pattern formation in convection, to the onset of turbulence in shear flows. Laurette Tuckerman or Patrice Le Gal, Guest Editors of this topical issue, extend a warm invitation to all researchers, with a wide interpretation of the field. The deadline for submission is July 1st 2013. The full call for papers can be found here