94 research outputs found

    Lump-like Structures in Scalar-field Models

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    In this work we investigate the presence of lump-like solutions in models described by a single real scalar field. We take advantage of a procedure recently used to describe explicit analytical solutions and we study several distinct models, showing how the parameters can be used to control the specific features of the lump-like structures. The proposed models are of direct interest to the construction of q-balls, to induce tachyonic excitations and gravitating structures of nontopological profile on braneworld models with a single extra dimension, to map solitons in optical fibers, and to describe collective excitations in Bose-Einstein condensates.Comment: 7 pages, 11 figure

    Coral disease prevalence in Gulf of Mannar and Lakshadweep Islands

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    1755-1762Coral disease prevalence was higher in Coral reefs of Gulf of Mannar (GOM) (Kurusadai= 23.42% and Manoli = 15.23%) than in the Lakshadweep group (Kavaratti = 11.2% and Agatti= 9.65%). white band, white pox, white plague, pink line syndrome, pink spot, yellow band, fungal blotch, black band and necrotic patches were all observed during the survey. Pink spot disease (35.08%) was the most prevalent disease among other observed infections. Massive corals especially Porites Spp. was highly affected (18.2%) and followed by Pocillopora (6%) Acropora (5.3%), Goniastrea (3.6%), Favia (3.5%), Montipora (2.3%) , Favia (3.5%), Galaxea (1.3%) and Fungia (0.89%) . Massive corals were found more susceptible to diseases than branching corals. High levels of new mortality and disease prevalence at Kavaratti and Agatti islands suggests that the coral reefs of Lakshadweep are facing increasing pressure from a variety of stresses
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