Helicotylenchus oleae n. sp. and H. neopaxilli n. sp., from olive roots and soil in Italy, are described and illustrated. Helicotylenchus oleae can be distinguished from the related species H. canadensis and H. tunisiensis especially by the smaller styler, its distinctive tail shape, and a tail longer than one anal body width. Helicotylenchus neopaxilli differs from the close species H. paxilli...

A nonlinear small-strain elastic theory is constructed from a systematic expansion in Biot strains, truncated at quadratic order. The primary motivation the desire for clean separation between stretching and bending energies shells, which appears to arise only reduction of bulk energy this type. An approximation isotropic invariants, bypassing solution quartic equation or computation tensor squ...

We investigate steady states of a quasilinear first order hyperbolic partial integro-differential equation. The model describes the evolution of a hierarchical structured population with distributed states at birth. Hierarchical size-structured models describe the dynamics of populations when individuals experience size-specific environment. This is the case for example in a population where in...

Recently, continuum elasticity theory has been applied to explain the shape transition of icosahedral viral capsids--single-protein-thick crystalline shells--from spherical to "buckled" or faceted as their radius increases through a critical value determined by the competition between stretching and bending energies of a closed two-dimensional (2D) elastic network. In the present work we genera...

The widespread application of superconducting magnetic levitation bearings is limited by their relatively low stiffness. Recently we investigated a novel thrust bearing geometry comprised conical frustum (or truncated cone) shaped permanent magnet levitating inside matching tapered hole machined into high-temperature superconductor bulk. This configuration was found to produce superior restorin...

In this paper we derive the linear elastic Cosserat shell model incorporating in variational problem effects up to order $O(h^{5})$ thickness $h$ as a particular case of recently introduced geometrically nonlinear model. The existence and uniqueness solution is proven suitable admissible sets. To end, inequalities Korn-type for shells are established which allow show coercivity Lax-Milgram theo...

A mathematical model of the dynamic instability a three-layer conical shells with honeycomb structure made using additive technologies has been obtained. Dynamic is recognized as interaction shell supersonic gas flow. The middle layer that homogenized into an orthotropic homogeneous medium. top and bottom layers are carbon fiber. vibrations described by fifteen unknowns. Each five unknowns: thr...