Abundance patterns of the hermit crab Pagurus maclaughlinae and its gastropod shell resources were compared to one another across the shallow subtidal landscape within Tampa Bay, Florida at a landscape (4.88 ha) and a sub-landscape (1 m2) scale. Specifically, we investigated whether the spatial abundance patterns of P. maclaughlinae over time could be explained by the abundance patterns of eith...

Large-amplitude, geometrically non-linear vibrations of free-edge circular plates with geometric imper-fections are addressed in this work. The dynamic analog of the von Kármán equations for thin plates, with a stress-free initial deflection, is used to derive the imperfect plate equations of motion. An expansion onto the eigenmode basis of the perfect plate allows discretization of the equatio...

BACKGROUND During the Late Jurassic, several groups of eucryptodiran turtles inhabited the shallow epicontinental seas of Western Europe. Plesiochelyidae are an important part of this first radiation of crown-group turtles into coastal marine ecosystems. Fossils of Plesiochelyidae occur in many European localities, and are especially abundant in the Kimmeridgian layers of the Swiss Jura Mountai...

We investigated the ability of bacterial communities to colonize and dissolve two biogenic carbonates (Foraminifera and oyster shells). Bacterial carbonate dissolution in the upper water column is postulated to be driven by metabolic activity of bacteria directly colonising carbonate surfaces and the subsequent development of acidic microenvironments. We employed a combination of microsensor me...

To study the interaction of a vibrating shallow shell with three-dimensional subsonic gas flow, we deduce system hypersingular integral equations for aerodynamic derivatives pressure drop. This is convenient solution problems aeroelasticity. We solve by using numerical approach based on discrete vortex method. model vibrations shells, ordinary differential help assumed-mode also perform investi...

This paper presents a follow-up study of previous work that deals with the free vibration moderately thin isotropic shallow shells under general edge conditions. The same semi-analytical method is used in this for identical shape and degree curvature doubly curved geometry, accurate natural frequencies are tabulated wide range shell Emphasis made, however, to present frequency parameters very t...

Shell foundations are often used to raise the carrying capacity of a structure on weak soils. In cases where large superstructure loads must be transferred poorer soils, shell more cost-effective than ordinary shallow foundations. Advances in study and design shell-type have shown their superiority over traditional footings The current aims investigate shape’s influence ultimate load capacity. ...