The logically rectangular finite volume grids for two-dimensional partial differential equations on a sphere and for three-dimensional problems in a spherical shell introduced recently have nearly uniform cell size, avoiding severe Courant number restrictions. We present recent results with adaptive mesh refinement using the GeoClaw software and demonstrate well-balanced methods that exactly ma...

The common egg shell, Ovula ovum, is found in shallow reefs (down to 20 m) throughout the IndoPacific. It belongs to the family Ovulidae and is closely related to the true cowries of the family Cypraeidae (Abbott and Dance 2000). O. ovum are very common in the Marshall Islands especially around Majuro atoll where the local people collect them extensively. The shiny white shells are sold alone o...

Shell structures are widely used in various fields of technology and construction. Often, they play the role a bearing surface with assemblies, overlays, aggregates installed on them. At same time, solving problems, such attached elements considered as concentrated at points rigidly connected. Vibrations an orthotropic viscoelastic shallow shell masses geometrically nonlinear setting considered...

Low natural frequencies and vibration modes of the structure, consisting a closed circular cylindrical shell with end cap, having shape shallow spherical segment, are examined in paper using numerical asymptotic methods. There three types vibrations structure. Natural first type close to shell, second - those third cantilever beam load at end. In part research approximate values for found by As...

This study explores the potential of intertidal Protothaca staminea shells as high-resolution geochemical archives of environmental change in a coastal upwelling region. Mg/Ca and Sr/Ca ratios were analyzed by excimer laser ablation-inductively coupled plasma mass spectrometry (LA-ICP-MS) at subweekly temporal resolution in shells growing 1 mm per month. Growth patterns of a modern P. staminea ...