Faculty Publications

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    Sedimentary environs of the intertidal areas of Massawa coast: Distribution patterns of ornamental Molluscs (Gastropods) Red Sea, Eritrea
    (2012) Prabhu, H.V.; Raghavan, B.R.; Deepthi, T.; Asmelash, M.; Fsehatsion, M.; Selemun, M.; Venkat Reddy, D.
    The distribution patterns of the four orders of Gastropods with respect of the three sites i.e Tiwalet area, Gurgussum I and Gurgussum II of the intertidal areas of Massawa coast, Red Sea have been investigated to appreciate the heterogeneity in the distribution patterns. This is determined by the sediment texture. The habitat of the Molluscs in relation to the substratum in the three sites off Massawa Coast show the nature of the substrate was hard as a result of deposition of the sediments in a shallow and rapidly drying environment. In this study, 30 different species of Gastropoda were identified. All of them are members of the sub class Prosobranchia, and distributed among four orders Neogastropoda, Mesogastropoda, Archaeogastropoda, and Pyramidellomorpha. Based on the statistical Analysis of Variance (ANOVA) carried at 5% level of significance, there was a considerable variation among the three sites in the distribution patterns of the four orders of gastropods. This difference is largely due to the differences in the shell shape and structure, and the sediment textural differences in the three sites. © 2012 CAFET-INNOVA TECHNICAL SOCIETY.
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    Nonlinear buckling and free vibration analysis of auxetic graphene origami composite beams under nonuniform thermal environment
    (Taylor and Francis Ltd., 2025) Shashiraj; Pitchaimani, J.; Kattimani, S.
    This study examines the thermo-mechanical behavior of auxetic metamaterial beams enhanced by graphene origami (GOri) under spatially varying nonuniform temperature distributions (SVTD). Utilizing Timoshenko beam theory considering von-Kármánn type nonlinear strain–displacement relationship, GOri beams are modeled as layered structures. The Ritz method is employed to solve equilibrium equations, analyzing the impact of GOri distribution patterns, content, and folding degree on post-buckling and vibration paths. The effects of five SVTDs, three end conditions, and three GOri distribution patterns on buckling, post-buckling behavior, and nonlinear free vibration characteristics are explored. Findings reveal that the parabolic temperature distribution with peak temperatures at beam ends (P-MAE) results in higher critical temperatures and nonlinear free vibration frequencies. This research provides crucial insights into the design and optimization of GOri-enabled metamaterial structures in complex thermal environments, highlighting the significant influence of nonuniform temperature distributions along the beam’s length. © 2024 Taylor & Francis Group, LLC.