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Journals and Conferences
We present λ3.5 cm and λ6.2 cm radio continuum maps in total and polarized intensity of the barred galaxies NGC 1097 (at 2′′–15′′ resolution) and NGC 1365 (at 9′′–25′′ resolution). A previously unknown radio galaxy southwest of NGC 1097 is reported. Apart from a smooth faint envelope and a bright central region, both galaxies exhibit radio ridges roughly… (More)
The Herzenberg dynamo, consisting of two rotating, electrically conducting spheres with non-parallel spin axes, immersed in a nite, spherical conducting medium, is simulated numerically for a variety of parameters not accessible to the original asymptotic theory. Our model places the spheres in a spatially periodic box. The largest growth rate is obtained… (More)
We report our first results on comparing the variations of the solar internal rotation with solar activity, as predicted by non-linear solar dynamo modelling, with helioseismic measurements using the SOHO MDI data.
Photosensitive effects distinguished as type I and type IIA photosensitivity within optical fibers were observed in a much more pronounced form within germanosilica waveguides deposited by hollow-cathode plasma-enhanced chemical-vapor deposition. With increasing exposure to 193-nm UV light, positive index changes greater than 2 x 10(-3) were observed,… (More)
A narrow-bandpass filter with a 15-dB signal-to-noise level is demonstrated using Bragg-grating assisted mode conversion within a tapered waveguide. The potential effects of such filters in wavelength-division multiplexing systems are discussed.
E. Edgar & H.E. Connor: Flora of New Zealand. Vol. 5, Gramineae; Manaal~" Whenua Press, Lincoln, 2000, 650pp. Price USD 55.-, ISBN 0-478-09331-4. The present volume completes the Flora of New Zealand series started in 1961. It covers the family Gramineae, represented in New Zealand by 188 native and 226 naturalized species. The treatment is based on many… (More)
Key words magnetic fields – magnetohydrodynamics (MHD) Although current interest in astrophysical dynamo theory is largely focussed on flows with both large-and small-scale motions, historically the study of dynamos driven by laminar flows has been important. Some classical laminar flow dynamos are reviewed. These results were obtained in an asymptotic… (More)
The up-turn in Euclidean normalised source counts below 1mJy at 1.4GHz is well established in many deep radio surveys. There are strong reasons, observationally and theoretically, to believe that this up-turn is due to strong evolution of the starforming population up to z=2. However this hypothesis needs further confirmation spectroscopically and the… (More)