We show how precision lensing measurements can be obtained through the lensing magnification effect in high redshift 21cm emission from galaxies. Normally, cosmic magnification measurements have been seriously complicated by galaxy clustering. With precise redshifts obtained from 21cm emission line wavelength, one can correlate galaxies at different source planes, or exclude close pairs to elim...

Canadian scientists and engineers are developing a prototype radio telescope using a novel concept that will permit very large aperture antennas to be constructed at a fraction of current costs. At a diameter of about 200 m, the Canadian Large Adaptive Reflector (CLAR) will be the largest fully steerable radio telescope in the world. At short cm wavelengths it will yield a factor of four improv...

The so-called leapfrog transformation that was first introduced for fullerenes (trivalent polyhedra with 12 pentagonal faces and all other faces hexagonal) is generalised to general polyhedra and maps on surfaces. All spherical polyhedra can be classified according to the i r leapfrog order. A polyhedron is said to be of Clar type if there exists a set of faces that cover each vertex exactly on...

We outline the construction of an algebraic (numerical) representation for Clar's valence formulas which in their geometrical form are illustrated with π-aromatic sextets as inscribed circles in benzenoid rings.

After 4 weeks of treatment, clarithromycin (CLAR) and amikacin showed similar antimicrobial activities against the Mycobacterium avium complex in mice. There was a difference, however, in the effectiveness of the drugs in different types of mice: both drugs displayed bactericidal effects in beige mice but only bacteriostatic effects in nude mice. Because the effectiveness of CLAR is less in nud...

The paper argues for the importance of utterances (as opposed to \sen-tences in context") as basic units in dialogue. The main case study is clar-iication: a characterization is provided within KOS, a recently developed synthesis of situation semantics and dialogue games, of the clariications that can follow up on an utterance. This involves outlining: (a) a theory of understanding for dialogue...