Made for an unknown client about 1750, it is attributed to Samuel Harding of Philadelphia on the basis of the carved shell within a shell.
Paleontologists interpret bivalves on the basis of shell features, notably shell and ligament structure, arrangement of hinge teeth, and body form as interpreted from internal muscle scars.
The solution of the coupled vibroacoustic problem is based on the representation of the response of the complete system on the modal basis of the in vacuo shell structure.
Phylogenetically and on the basis of their shell protein complement the α-carboxysomes of chemoautotrophs (incl. H. neapolitanus) and many marine cyanobacteria can be distinguished from the β-carboxysomes found mostly in freshwater cyanobacteria [2].
The mutual monophyly of each of the three major lineages of planktonic foraminifera recognized on the basis of their shell ultrastructure, 32 i.e. the microperforate nonspinose, the macroperforate nonspinose, and the spinose groups, was moderately to well supported under ML as the optimality criterion (Fig. 3; Table 4).
Computer-aided design-based NURBS surfaces form the basis of isogeometric shell analysis which exploits the smoothness and higher continuity properties of NURBS to derive a suitable analysis model in an isoparametric sense.
The problem is studied on the basis of a shell theory in which it is assumed that the honeycomb core resists only transverse shear forces and that the facings resist only bending moments.
On the basis of the intramolecular "core-shell strategy," we designed dihydropyracylene with two spiro(dibenzocycloheptatriene) units, for which theoretical calculations predicted a very weak C C bond with a bond length around 1.8 Å.
The effect of pre-buckling nonlinearity on the bifurcation point of a conical shell is examined on the basis of three shell theories: Donnell's, Sanders' and Timoshenko's.
Despite the formulation of detailed hypotheses regarding the molecular basis of molluscan shell formation [ 21- 24], these do not account for the initiation of biomineralisation or changes in shell construction during a mollusc's life [see [ 25] for a review of the mineralogical transitions that occur in larval forms].
