38 research outputs found
Small-scale solar magnetic fields
As we resolve ever smaller structures in the solar atmosphere, it has become
clear that magnetism is an important component of those small structures.
Small-scale magnetism holds the key to many poorly understood facets of solar
magnetism on all scales, such as the existence of a local dynamo, chromospheric
heating, and flux emergence, to name a few. Here, we review our knowledge of
small-scale photospheric fields, with particular emphasis on quiet-sun field,
and discuss the implications of several results obtained recently using new
instruments, as well as future prospects in this field of research.Comment: 43 pages, 18 figure
Role of chaos for the validity of statistical mechanics laws: diffusion and conduction
Several years after the pioneering work by Fermi Pasta and Ulam, fundamental
questions about the link between dynamical and statistical properties remain
still open in modern statistical mechanics. Particularly controversial is the
role of deterministic chaos for the validity and consistency of statistical
approaches. This contribution reexamines such a debated issue taking
inspiration from the problem of diffusion and heat conduction in deterministic
systems. Is microscopic chaos a necessary ingredient to observe such
macroscopic phenomena?Comment: Latex, 27 pages, 10 eps-figures. Proceedings of the Conference "FPU
50 years since" Rome 7-8 May 200
Universal hierarchical symmetry for turbulence and general multi-scale fluctuation systems
Activation of Androgen Receptor in Prostate Cancer: Role of Protein Kinase A and Extracellular Signal-regulated Kinases
Singular spectral analysisâbased denoising without computing singular values via augmented Lagrange multiplier algorithm
Production of pulsed ultra slow muons and first μSR experiments on thin metallic and magnetic films
At ISIS, RAL (UK) we have produced a pulsed ultra-slow muon beam (Eâ€20 eV) and performed the first ÎŒSR experiments. Thanks to the pulsed feature, the implantation time is automatically determined and, by adjusting the final muon energy between approximately 8 keV and 20 eV, depth slicing experiments are possible down to monolayers distances. We report slicing experiments across a 20 nm copper film on quartz substrate with evidence for a 2 nm copper oxide surface layer. A preliminary experiment on a hexagonal cobalt film suggests the existence of muon precession in the local magnetic field