881 citations
- Los Alamos National LaboratoryUS13 papers
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- Center for Astrophysics Harvard & SmithsonianUS7 papers
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15 papers · 1 filter
Pontryagin's principle of stabilization
Sergey Nikitin
The paper presents necessary and sufficient conditions for a nonlinear system to be stabilized by a feedback. The conditions are based on the ideas related to the well-known Pontry…
1/N_c Corrections in Meson-Baryon Scattering
Herry J. Kwee, Richard F. Lebed
Corrections to meson/ground-state baryon scattering amplitudes in the 1/N_c expansion of QCD have previously been shown to be controlled by the t-channel difference |I_t - J_t| of…
pi N --> Multi-pi N Scattering in the 1/N_c Expansion
Herry J. Kwee, Richard F. Lebed
We extend the 1/N_c expansion meson-baryon scattering formalism to cases in which the final state contains more than two particles. We first show that the leading-order large N_c p…
Quasiparticle self-consistent method; a basis for the independent-particle approximation
Takao Kotani, Mark van Schilfgaarde, Sergey V. Faleev
We have developed a new type of self-consistent scheme within the approximation, which we call quasiparticle self-consistent (QS). We have shown that QS rather we…
On squares in Lucas sequences
A. Bremner, N. Tzanakis
Let P and Q be non-zero integers. The Lucas sequence U_n(P,Q) is defined by U_0=0, U_1=1, U_n= P*U_{n-1}-Q*U_{n-2} for n >1. The question of when U_n(P,Q) can be a perfect square h…
Deviations from He I Case B Recombination Theory and Extinction Corrections in the Orion Nebula
K. P. M. Blagrave, P. G. Martin, R. H. Rubin +4
We are engaged in a comprehensive program to find reliable elemental abundances in and to probe the physical structure of the Orion Nebula, the brightest and best-resolved H II reg…