2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/120144We elaborate on a general method to find complex envelope solitons in a cigar shaped Bose-Einstein condensate in a trap. The procedure incorporates time dependent scattering length, oscillator frequency and loss/gain. A variety of time dependencies of the above parameters, akin to the ones occurring in the experiments can be tackled.3 pages, 2 eps figures, To appear in the proceedings of Condensed Matter Days - 2006Other Condensed Mattertext