Polyacrylonitrile (PAN) nanofibers were prepared by a needleless electrospinning method using three rotating fiber generators, cylinder, disc and coil. The effects of the spinneret shape on the electrospinning process and resultant fiber morphology were examined. The disc spinneret needed the lowest voltage to initiate fiber formation, followed by the coil and cylinder. Compared to cylinder, th...

Observations of the Galactic Centre show evidence of disc-like structures of very young stars orbiting the central super-massive black hole within a distance of a few 0.1 pc. While it is widely accepted that about half of the stars form a relatively flat disc rotating clockwise on the sky, there is a substantial ongoing debate on whether there is a second, counter-clockwise disc of stars. By me...

We present the 2.4−45 μm ISO-SWS spectrum of the Be star γ Cas (B0.5 IVe). The spectrum is characterised by a thermal continuum which can be well fit by a powerlaw Sν ∝ ν0.99 over the entire SWS wavelength range. For an isothermal disc of ionized gas with constant opening angle, this correponds to a density gradient ρ(r) ∝ r−2.8. We report the detection of the Humphreys (6-∞) bound-free jump in...

Here we report the results of three parallel efforts: the recal0.3%. Likewise, Joe Michalsky went to the SGP site with a ibration and reanalysis of pyrano-metric data from Southern recently calibrated Eppley Normal Incidence Pyrheliometer Great Plains (SGP) to improve its accuracy, use of the (NIP) and an Eppley Precision Spectral Pyranometer (PSP). multifilter rotating shadowband radiometer (M...