Those wonderful elastic waves

Elastic waves in helical waveguides

Those troublesome but never tiresome triphasic waves.

(TWs) and generalized spike waves (GSWs), as in nonconvulsive generalized status epilepticus, are biologically distinct, but can closely resemble one another on the scalprecorded EEG.1 As numerous authors have pointed out, TWs are characteristic of metabolic encephalopathies.2-5 However, they have also been described in sepsis, meningitis and cortical degenerative diseases.6-9 Many of these con...

Waves in Wood: Elastic Waves in Cylindrically Orthotropic Materials

We consider elastic waves in materials with cylindrical orthotropy, this being a plausible model for wood. For time-harmonic motions, the problem is reduced to some coupled ordinary differential equations. Previously, these have been solved using the method of Frobenius (power-series expansions). We use Neumann series (expansions in Bessel functions of various orders), motivated by the known cl...

Automorphisms of Wonderful Varieties

Let G be a complex semisimple linear algebraic group, and X a wonderful G-variety. We determine the connected automorphism group Aut(X) and we calculate Luna’s invariants of X under its action.

Wonderful Thing

W ith the increased dependence on networks and the near ubiquitous availability of the Internet, there is a new paradigm in place for the proliferation of spyware, viruses, and other malware. In fact, much attention has been given to spyware in popular literature with reports from multiple sources indicating that spyware has perhaps reached 90% home user PCs [2]. There is reason to believe this...