- Published on 12 October 2010
A group of researchers in Greifswald, Germany, measured the electron concentration and electron temperature in the active discharge zone of a self-organized plasma jet. Self-organized discharge patterns are shown as time averaged top view in the picture.
Miniaturized non-thermal plasma jets are an emerging technique for surface treatments at ambient pressure, such as cleaning, activation, etching, films deposition and more.
The authors of this EPJ D paper used two independent approaches: spectroscopy and a two-dimensional fluid model calculation of a discharge filament. The results from the two methods are consistent and indicate electron concentrations between 2.2 and 3.3×1014 cm-3. This work represents a first step towards a thorough physical description of the discharge dynamics and energy transport to gain a better understanding of self-organization effects in non thermal plasma jets.
- Published on 01 October 2010
Ground breaking experiments in EPJ B by D. Honecker and colleagues on an FeCr two-phase nanocrystalline alloy demonstrate the power of one-dimensional neutron-spin analysis in a small-angle neutron scattering (SANS) experiment.
- Published on 14 September 2010
New experiments on the flow of solid He through a microscopic hole reveal a mechanism that triggers the geysers based on the breakdown of a plug located upstream of the source chamber.
The vacuum expansion of solid helium through a micrometric orifice was suggested as a mean to inject excess vacancies into the solid bulk [R. Grisenti et al, J. Electr. Spectr. 129 (2003) 201]. But while the He flow seems smooth, unexpected periodic bursts out of the orifice (geyser effect) are observed during these vacuum expansion experiments.
- Published on 01 September 2010
The topics of this special issue will include: Quantum simulation using cold atoms in optical lattices; fermionic mixtures of ultracold atoms; collisions of cold polar molecules; controlled interactions in quantum gases of metastable atoms; cavity-mediated molecular cooling; quantum-degenerate dipolar gases of bialkali molecules.
- Published on 19 July 2010
Professor Gaetana Laricchia of UCL, London, has been awarded the Thomson medal and prize for her contributions to the development of the world's only positronium beam and its use to probe the properties of atoms and molecules. This follows closely the Occhialini prize which she received in 2009.
- Published on 28 June 2010
The physics paper with the highest percentage increase in citations so far in 2010, as determined by ScienceWatch.com, is `Parton distributions for the LHC' by A Martin et al. Eur.Phys.J.C63:189-285, 2009 This article has meanwhile been cited over 200 times, according to the reference database for high-energy physics, SPIRES. The paper was already selected as highlighted article by the editorial board of EPJ C, featuring on the cover of the September 2009 issue of this journal.
IPPP Durham http:/www.ippp.dur.ac.uk/modules/news/news_0024.html?uri=/News/index.html
- Published on 23 June 2010
The shape of the interface between two fluids can be controlled by changing the refractive index contrast between the fluids, researcher from the Universite Bordeaux have shown. Optofluidics are methods based on the combination of optics and fluidics which have recently promoted innovative approaches to manipulate liquid interfaces. Since flows are optically driven, researchers call this emerging field optohydrodynamics. The recent paper published in EPJ E presents a fine example of optohydrodynamic actuation at the microscopic scale, based on experimental and predictive numerical results. This work illustrates one of the simplest manifestations of optohydrodynamics and provides a frame to anticipate further developments of contactless interface micromanipulation by lasers.
To read the full paper ‘Optohydrodynamics of soft fluid interfaces: Optical and viscous nonlinear effects’ by H. Chraibi et al. click here
- Published on 21 June 2010
This July, during the International Soft Matter Conference 2010 in
Granada, Spain, Professor Sam Safran will give the EPJ E - Pierre
Gilles De Gennes lecture, associated with a prize given by the
publishers of EPJ.
This is the first edition of the *EPJE - Pierre-Gilles De Gennes Lecture Prize*, which takes the name from the illustrious Nobel laureate who founded EPJ E.
The Editors in Chief elected Prof. Sam Safran of the Weizman Instutite, Israel, as the prize recipient to acknowledge his leading research in soft matter and biological physics. The prize was also endorsed by the ISMC 2010 conference committee.
The prize will be presented to Prof. Sam Safram by Prof. Dominique Langevin (who is an Associate Editor of EPJ E) at the beginning of his plenary talk, 6 July at 8.30 am.
If you wish to vist the ISMC 2010 website go to http:/ismc2010.ugr.es/
- Published on 17 June 2010
Stark deceleration has emerged over the last decade as a leading technique for obtaining packets of quantum-state-selected molecules whose velocity can be tuned all the way down to zero. Here, a new compact, ultrahigh-vacuum-compatible Stark decelerator is described and demonstrated. The deceleration stages are fashioned out of tantalum wires, reducing the total length to about a tenth of that of a conventional Stark decelerator with the same number of electrode pairs.
The significantly lower cost of assembling and operating the wire decelerator makes it an attractive source of cold molecules, for use in applications ranging from trapping experiments to cold collisions to sympathetic cooling.
A. Marian, H. Haak, P. Geng, and G. Meijer, Eur. Phys. J. D (2010)