454 research outputs found
Order convergence in infinite-dimensional vector lattices is not topological
In this note, we show that the order convergence in a vector lattice is
not topological unless . Furthermore, we show that, in atomic
order continuous Banach lattices, the order convergence is topological on order
intervals
Surface-enhanced optical third-harmonic generation in Ag island films
Surface-enhanced optical third-harmonic generation (THG) is observed in
silver island films. The THG intensity from Ag nanoparticles is enhanced by
more than two orders of magnitude with respect to the THG intensity from a
smooth and homogeneous silver surface. This enhancement is attributed to local
plasmon excitation and resonance of the local field at the third-harmonic
wavelength. The diffuse and depolarized component of the enhanced THG is
associated with the third-order hyper-Rayleigh scattering in a 2-D random array
of silver nanoparticles.Comment: 4 pages, 2 figure
Surface modification of titanium by pulsed laser radiation of femtosecond duration
The effect of an infrared pulse laser with femtosecond radiation (λ = 744 nm, τ ≈ 120 fs, E ≤ 8 mJ) on the surface of Ti of commercially purity in the submicrocrystalline state is investigated using scanning electron microscopy (SEM)yesBelgorod State Universit
Nontrivial dependence of dielectric stiffness and SHG on dc bias in relaxors and dipole glasses
Dielectric permittivity and Second Harmonic Generation (SHG) studies in the
field-cooled mode show a linear dependence of dielectric stiffness (inverse
dielectric permittivity) on dc bias in PMN-PT crystals and SHG intensity in
KTaO:Li at small Li concentrations. We explain this unusual result in the
framework of a theory of transverse, hydrodynamic-type, instability of local
polarization.Comment: 5 figure
Revisiting the 'LSND anomaly' II: critique of the data analysis
This paper, together with a preceding paper, questions the so-called 'LSND
anomaly': a 3.8 sigma excess of antielectronneutrino interactions over standard
backgrounds, observed by the LSND Collaboration in a beam dump experiment with
800 MeV protons. That excess has been interpreted as evidence for the
antimuonneutrino to antielectronneutrino oscillation in the \Deltam2 range from
0.2 eV2 to 2 eV2. Such a \Deltam2 range is incompatible with the widely
accepted model of oscillations between three light neutrino species and would
require the existence of at least one light 'sterile' neutrino. In a preceding
paper, it was concluded that the estimates of standard backgrounds must be
significantly increased. In this paper, the LSND Collaboration's estimate of
the number of antielectronneutrino interactions followed by neutron capture,
and of its error, is questioned. The overall conclusion is that the
significance of the 'LSND anomaly' is not larger than 2.3 sigma.Comment: 30 pages, 16 figures, 6 table
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