Continental drift and true polar wandering

Alfred Wegener and continental drift

Darwin's continental drift

Lisbon is grandly celebrating the Darwin anniversaries, but to the east in Turkey things are different.

True polar wander and supercontinents

I present a general model for true polar wander (TPW), in the context of supercontinents and simple modes of mantle convection. Old, mantle-stationary supercontinents shield their underlying mesosphere from the cooling effects of subduction, and an axis of mantle upwelling is established that is complementary to the downwelling girdle of subduction zones encircling the old supercontinent. The u...

A true case of wandering pacemaker

Figure 1 Chest radiograph demonstrates an orphaned right ventricular lead with separation of the outer and inner conductors at the level of the right atrium. Inset: The inner conductor (arrows) extends beyond the inferior cardiac border and terminates beneath the diaphragm. Case report A 41-year-old woman was evaluated in the emergency department because of symptoms of chest and epigastric disc...

Brownian Motion with Polar Drift

Consider a strong Markov process X° that has continuous sample paths in Rd (d > 2) and the following two properties. (1) Away from the origin X° behaves like Brownian motion with a polar drift given in spherical polar coordinates by n{8)/2r. Here /i is a bounded Borel measurable function on the unit sphere in RJ, with average value Ji. (2) X° is absorbed at the origin. It is shown that X° reach...