. R A ] 8 J un 1 99 9 GENERALIZED SELECTIVE MODAL ANALYSIS

ar X iv : m at h / 99 06 04 3 v 3 [ m at h . R A ] 2 7 Ju l 1 99 9 GENERALIZED SELECTIVE MODAL ANALYSIS

1. Review of SMA. Selective Modal Analysis (SMA) is a physically motivated framework for understanding, simplifying and analyzing complex linear time invariant models of dynamic systems. SMA can focus on selected portions of the structure and behaviour of the system [1, 2]. In many physical systems, it can be readily recognized that some set of modes is asociated to a certain set of variables. ...

ar X iv : m at h / 99 06 04 3 v 2 [ m at h . R A ] 1 8 Ju n 19 99 GENERALIZED SELECTIVE MODAL ANALYSIS

1. Review of SMA. Selective Modal Analysis (SMA) is a physically motivated framework for understanding, simplifying and analyzing complex linear time invariant models of dynamic systems. SMA can focus on selected portions of the structure and behaviour of the system [1, 2]. In many physical systems, it can be readily recognized that some set of modes is asociated to a certain set of variables. ...

un 1 99 9 Exact diagonalization of the generalized supersymmetric t − J model with boundaries

We study the generalized supersymmetric t−J model with boundaries. Starting from the trigonometric R-matrix, and in the framework of the graded quantum inverse scattering method (QISM), we obtain the eigenvalues and Bethe ansatz equations of the supersymmetric t−J model with boundaries in three different backgrounds. PACS: 75.10.Jm, 71.10.Fd, 05.30.Fk.

/ 99 06 28 6 v 1 8 J un 1 99 9 B → X s l + l − decays in supersymmetry

ar X iv : a st ro - p h / 99 04 24 4 v 2 3 J un 1 99 9 Is SGR 1900 + 14 a Magnetar ?

We present RXTE observations of the soft gamma–ray repeater SGR