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Bb Ohm's Theorem for Bb Ohm Trees

We prove that adding to the pure-calculus a non-deterministic choice operator and a standard numeralsystem we obtain a language which internally discriminates two-terms if and only if they have diierent BB ohm trees.

Invited article: Electric solar wind sail: toward test missions.

The electric solar wind sail (E-sail) is a space propulsion concept that uses the natural solar wind dynamic pressure for producing spacecraft thrust. In its baseline form, the E-sail consists of a number of long, thin, conducting, and centrifugally stretched tethers, which are kept in a high positive potential by an onboard electron gun. The concept gains its efficiency from the fact that the ...

A new BB forceps.

Retained intraocular BBs are difficult to remove. According to manufacturers' specifications, BBs have a spherical diameter of 4.5 mm and a copper plate covering a steel core. They have only moderate magnetic properties because of the copper plate cover and they are too large to be grasped by almost all intraocular forceps and, therefore, present a problem when they are retained in the eye afte...

Optimizing Bb Uchi Automata

We describe a family of optimizations implemented in a translation from a lin ear temporal logic to B uchi automata Such optimized automata can enhance the e ciency of explicit state model checking as practiced in tools such as Spin Some of our optimizations are applied during preprocessing of temporal formulas others are applied during the translation algorithm itself while other key optimizat...