24,269 research outputs found
Hadronic Events at LEP
The hadronic events collected by LEP between 1989 and 2000 have changed
dramatically our understanding of QCD, which has now been established as a part
of the Standard Model. Still in many sectors (nonperturbative in particular)
science analysis needs to be completed, and some new studies are just starting.Comment: 4 pages; invited talk at the IFAE, Lecce (Italy), May 200
GLAST, the Gamma-ray Large Area Space Telescope
GLAST, a detector for cosmic gamma rays in the range from 20 MeV to 300 GeV,
will be launched in space in 2005. Breakthroughs are expected in particular in
the study of particle acceleration mechanisms in space and of gamma ray bursts,
and maybe on the search for cold dark matter; but of course the most exciting
discoveries could come from the unexpected.Comment: 6 pages, 3 figures. Invited talk at the hird International Workshop
"New Worlds in Astroparticle Physics", September 2000, University of the
Algarve. Faro, Portugal. To be published in the Proceeding
The Stern diatomic sequence via generalized Chebyshev polynomials
Let a(n) be the Stern's diatomic sequence, and let x1,...,xr be the distances
between successive 1's in the binary expansion of the (odd) positive integer n.
We show that a(n) is obtained by evaluating generalized Chebyshev polynomials
when the variables are given the values x1+1, ..., xr+1, and we derive a
formula expressing the same polynomials in terms of sets of increasing integers
of alternating parity. We also show that a(n) = Det(Ir + Mr), where Ir is the
rxr identity matrix, and Mr is the rxr matrix that has x1,...,xr along the main
diagonal, then all 1's just above and below the main diagonal, and all the
other entries are 0
A wave equation perturbed by viscous terms: fast and slow times diffusion effects in a Neumann problem
A Neumann problem for a wave equation perturbed by viscous terms with small
parameters is considered. The interaction of waves with the diffusion effects
caused by a higher-order derivative with small coefficient {\epsilon}, is
investigated. Results obtained prove that for slow time {\epsilon}t < 1 waves
are propagated almost undisturbed, while for fast time t > 1 {\epsilon}
diffusion effects prevail.Comment: Ricerche di Matematica (2018
Asymptotic estimates related to an integro differential equation
The paper deals with an integrodifferential operator which models numerous
phenomena in superconductivity, in biology and in viscoelasticity.
Initialboundary value problems with Neumann, Dirichlet and mixed boundary
conditions are analyzed. An asymptotic analysis is achieved proving that for
large t, the in uences of the initial data vanish, while the effects of
boundary disturbances are everywhere bounded
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