LII. A Labyrinth Probe

A D Lii CASE 3 A Singaporean

The practice of implanting foreign bodies into the penis for psychosexual reasons has been reported in journals of urology, radiology, and dermatology.'-4 It has not, to our knowledge, been reported in journals of venereology. Venereologists should be familiar with this practice, which may otherwise be mistaken for other pathological conditions. We here report three cases seen at this hospital ...

LII. An Essay towards solving a Problem

Labyrinth Chaos

A particularly simple and mathematically elegant example of chaos in a threedimensional flow is examined in detail. It has the property of cyclic symmetry with respect to interchange of the three orthogonal axes, a single bifurcation parameter that governs the damping and the attractor dimension over most of the range 2 to 3 (as well as 0 and 1) and whose limiting value b = 0 gives Hamiltonian ...

Borescope and Eddy Current Dual Probe for In Situ Detecting Cracks in an Aeroengine Labyrinth Disc

Cracks often arise in an aeroengine labyrinth disc, which endanger flight security. Non-destructive testing (NDT) must been carried out in the labyrinth disc during the aeroengine working time. In situ detecting cracks in the labyrinth disc, the probe need pass through three layers narrow holes of aircraft skin, engine shell and outlet duct. Ultrasonic, radiography and liquid penetrant inspecti...

LII - 4 , 4 ème trimestre 2011 SOMMAIRE

We show the existence of bilimits of 2-cofiltered diagrams of topoi, generalizing the construction of cofiltered bilimits developed in [2]. For any given such diagram represented by any 2-cofiltered diagram of small sites with finite limits, we construct a small site for the bilimit topos (there is no loss of generality since we also prove that any such diagram can be so represented). This is d...