We consider the system of the N vortex points with the identical strength on a sphere. As a local effect of the rotation of the sphere, we fix vortex points at the both poles, which are called the pole vortices. When the N vortex points are equally spaced along the line of latitude of the sphere, the configuration is called the “N -ring” or “N -gon”. It is a relative fixed configuration[3,4] an...

The pole structure of the low energy ππ scattering amplitudes is studied using a proper chiral unitarization method combined with crossing symmetry and the low energy phase shift data. It is found that the σ position is at M σ = 456 ± 30M eV , Γ σ = 580 ± 50M eV. The existence of the virtual state pole in the IJ=20 channel is reconfirmed. Various threshold parameters are estimated and are found...

The evolution o f the Antarct ic ozone hole is illustrated fo r 1985·1989 and 1990 springs.A detailed study for 1986.19 89 events indicates that evolution. which occurs in ea rly October . isfairly unifo rm over South Pole. Hence fluctuations observed at Syowa, McMurdo Palmer duringthis period arc mostly due to vortex \''3.11 passing out these periferial loca t ions. However, later inNovember w...

The purpose of this paper is the calculation of Unbalanced Magnetic Force (UMF) in permanent magnet brushless DC (PMBLDC) machines with diametrically asymmetric winding and investigation of UMF variations in the presence of phase advance angle. This paper presents an analytical model of UMF in surface mounted PMBLDC machines that have a fractional ratio of slot number to pole number. This model...

A condensate of p = 0 partons in the perturbative vacuum gives rise to a term ∝ δ(p) in the free PQCD propagators. The leading condensate contribution to the quark propagator can be exactly summed since there is a factor δ(p) associated to each loop. We calculate the dressed quark propagator in the presence of either a gluon or a quark condensate, for a number of colors N → ∞. The dressed quark...

Abstract We discuss the properties of fermion propagator in three dimensional QED with dressed photon based on spectral representation.Ward-Takahashi-identity among multi-photon-fermion amplitudes is given by the LSZ reduction formula and low-energy theorem.Simplest solution of this identity leads the spectral function which is obtained by exponentiatnig one photon matrix element.Massless vacuu...

We study I=0 d wave ππ scattering phase shift using a proper unitarization approach. It is verified that the f2(1270) resonance corresponds to a twin pole structure: one on the second sheet, another one on the third sheet. Also we find fair agreement on f2(1270) pole’s mass and width between our results and the PDG values. Besides, our analysis reveals the existence of a virtual state in this c...