3,049 research outputs found
Calculation of allowable orbital spacings for the fixed-satellite service
Minimum satellite separations are calculated which satisfy a given carrier-to-interference protection ratio for the Fixed-Satellite Service (FSS) on a single-entry basis, assuming circular antenna beams. The results are presented in the form of universal contour curves, in which antenna-centered angles are the coordinates, and also in terms of the more conventional longitude and latitude separations. It is shown that orbit capacity increases with decreasing service-area size and that, for practical service areas, capacity is increased if the longitude of a satellite does not differ too greatly from that of the service area it serves
Note on the Minimum Weight States in the su(2)-Algebraic Many-Fermion Model --- Extension of the Role of the Auxiliary su(2)-Algebra ---
The role of the auxiliary su(2)-algebra proposed by the present authors in
the latest paper is extended. Its aim is to determine the minimum weight states
completely. With the aid of scalar operators for the auxiliary algebra, new
aspects are added to the minimum weight states in the aligned scheme discussed
in the latest paper. Some simple examples are shown.Comment: 12 pages, no figur
A Role of the Quasiparticle in the Conservation of the Fermion Number
The role of the "quasiparticle" introduced in last paper by the present
authors is discussed. It serves as a guide for the deformation of the
Cooper-pair in the BCS-Bogoliubov approach. As an illustrative example, a
certain case is treated. This case produces the su(1,1)-like behavior in the
su(2)-algebraic many-fermion system.Comment: 10 pages, 2 figure
First Order Quark-Hadron Phase Transition in the NJL-Type Nuclear and Quark Model
The quark-hadron phase transition at finite baryon chemical potential is
investigated in the extended Nambu-Jona-Lasinio model in which the
scalar-vector eight-point interaction is included holding the chiral symmetry.
By comparing a pressure of the symmetric nuclear matter with that of the quark
matter, the realized phase at given baryon density is determined. As a result,
the first order quark-hadron phase transition is derived where the
deconfinement transition occurs after the chiral symmetry restoration in this
model.Comment: 16 pages, 12 figures, using PTPTeXclas
Semi-Classical Approach to the Two-Level Pairing Model --Various Aspects of Phase Change--
Aspects of the phase change of the two-level pairing model are investigated
in the semi-classical treatment by using the variational approch with the
mixed-mode coherent state. In the classical limit, , the sharp
phase transition appears and the two phases exist in the region where the force
strength is larger than a certain critical value. However, it is shown that, in
the semi-classical treatment, the above-mentioned behavior of the phase change
disappears in the analytical and the numerical treatments. As a result, new
understanding about aspects of the phase change in this model is given.Comment: 21 pages, 8 figures but figs.6, 7 and 8 are not included, using
PTPTeX.cl
Boson Realization of the su(3)-Algebra. II
On the basis of the Schwinger boson representation for the Lipkin model
developed in (I), the Holstein-Primakoff representation for the su(3)-algebra
is presented. Including the symmetric case, the representation obtained in this
paper contains all the cases.Comment: 12 pages, no figure, using PTP.cl
Boson Realization of the su(3)-Algebra. I
Following a general form for the Schwinger boson representation of the
su(M+1) Lipkin model presented in the previous paper, three types of the
orthogonal sets characterizing the su(3)-algebra are proposed. In these three,
third is presented in Appendix. The intrinsic state is specified by two quantum
numbers and two excited state generating operators play a central role.Comment: 13 pages, no figure, using PTP.cl
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