156 research outputs found
Existence of nodal solutions for Dirac equations with singular nonlinearities
We prove, by a shooting method, the existence of infinitely many solutions of
the form of the nonlinear Dirac
equation {equation*} i\underset{\mu=0}{\overset{3}{\sum}} \gamma^\mu
\partial_\mu \psi- m\psi - F(\bar{\psi}\psi)\psi = 0 {equation*} where
is compactly supported and \[F(x) = \{{array}{ll}
p|x|^{p-1} & \text{if} |x|>0 0 & \text{if} x=0 {array}.] with
under some restrictions on the parameters and We study also the
behavior of the solutions as tends to zero to establish the link between
these equations and the M.I.T. bag model ones
Form removal aspects on the waviness parameters for steel sheet in automotive applications : fourier filtering versus polynomial regression
Premium car makers attach great importance to the visual appearance of the painted car skin as an indication of product quality. The âorange peelâ phenomenon constitutes a major problem here. It is not only depending on the paintâs chemical composition and application method, but also on possible waviness components in the sheet substrate. Therefore one is searching hard for a valuable waviness parameter to quantify the substrateâs fitness for purpose. A technically emerging problem is how to remove the form from the measured signal, which is indeed not significant to the orange peel phenomenon. This paper will compare two commonly used approaches: i.e. Fourier filtering versus polynomial regression and will reveal and quantify some common aspects in terms of wavelengths
Puissances fractionnaires d'un opérateur générateur d'un semi-groupe distribution régulier
Estimates for a class of oscillatory integrals and decay rates for wave-type equations
This paper investigates higher order wave-type equations of the form
, where the symbol is a real,
non-degenerate elliptic polynomial of the order on . Using
methods from harmonic analysis, we first establish global pointwise time-space
estimates for a class of oscillatory integrals that appear as the fundamental
solutions to the Cauchy problem of such wave equations. These estimates are
then used to establish (pointwise-in-time) estimates on the wave
solution in terms of the initial conditions
A reduced basis method for electromagnetic scattering by multiple particles in three dimensions
Isotope evidence for soil organic carbon pools with distinct turnover ratesâII. Humic substances
Diverse origins of Arctic and Subarctic methane point source emissions identified with multiply-substituted isotopologues
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