One in 5 PN are ejected from common envelope binary interactions but Kepler results are already showing this proportion to be larger. Their properties, such as abundances can be starkly different from those of the general population, so they should be considered separately when using PN as chemical or population probes. Unfortunately post-common envelope PN cannot be discerned using only their morphologies, but this will change once we couple our new common envelope simulations with PN formation models.

Experiments reporting magnetic-field generation by the ablative nonlinear Rayleigh–Taylor (RT) instability are reviewed. The experiments show how large-scale magnetic fields can, under certain circumstances, emerge and persist in strongly driven laboratory and astrophysical flows at drive pressures exceeding one million times atmospheric pressure.

We are presently using the Chandra X-ray Observatory to conduct the first systematic X-ray survey of planetary nebulae (PNe) in the solar neighborhood. The Chandra Planetary Nebula Survey (ChanPlaNS) is a 570 ks Chandra Cycle 12 Large Program targeting 21 high-excitation PNe within ~1.5 kpc of Earth. When complete, this survey will provide a suite of new X-ray diagnostics that will inform the study of late stellar evolution, binary star astrophysics, and wind interactions. Among the early results of ChanPlaNS (when combined with archival Chandra data) is a surprisingly high detection rate of relatively hard X-ray emission from CSPNe. Specifically, X-ray point sources are clearly detected in roughly half of the ~30 high-excitation PNe observed thus far by Chandra, and all but one of these X-ray-emitting CSPNe display evidence for a hard (few MK) component in their Chandra spectra. Only the central star of the Dumbbell appears to display “pure” hot blackbody emission from a ~200 kK hot white dwarf photosphere in the X-ray band. Potential explanations for the“excess” hard X-ray emission detected from the other CSPNe include late-type companions (heretofore undetected, in most cases) whose coronae have been rejuvenated by recent interactions with the mass-losing WD progenitor, non-LTE effects in hot white dwarf photospheres, self-shocking variable winds from the central star, and slow (re-)accretion of previously ejected red giant envelope mass.

Currents were measured along two routes through Yell Sound to Sullom Voe in the Shetland Islands. Current meter moorings were deployed by the consulting engineers Peter Fraenkell and Partners for one month at 20 positions with three meters which measured the flow from near surface to a depth of 20 metres. The accuracy of these measurements is considered and the difficulty of making measurements in this region is illustrated.

The paper discusses the nature and variability of the currents that were measured and resolves the currents into a tidal and non-tidal component. An analysis procedure is developed for removing the tidal component and for producing tidal current vectors for each position. From this the general tidal circulation pattern is constructed and discussed. It is shown that tidal currents along the eastern route are too high at certain states of the tide for safe navigation.

Current surges of significant magnitude are shown to exist throughout the area. These are driven by the tidal motion and it is suggested that they are an effect of travelling gyres which are generated in the lee of islands and shallow banks when the tidal streams are largest.

This report describes twelve archaeological sites discovered and briefly surveyed in September 1971 by a team from the University of Bristol, led by the writers. The work was completed in three days, following a more extended and intensive survey of the Ayiofarango catchment area. Our attention was concentrated on the two harbour sites just east of the mouth of the Ayiofarango valley, at Kaloi Limenes and Lasaia, and on the evidence that they had attracted human occupation throughout antiquity (Plate 5a). Nevertheless, the whole of the coastal strip from the mouth of the Ayiofarango valley to the ruined church at Chrisostomos was examined (Fig. 1), and the areas between the gorge and the sites just west of Kaloi Limenes (SC1–5) and between Kaloi Limenes and the tholoi and Roman farmstead overlooking Lasaia (SC8–9) do seem to be empty of evidence for occupation at any period before the present.

The harbour was described briefly by Payne. As he says, the enclosed part is extremely small and now much silted up. Even if it was much deeper in antiquity it can never have had room for more than two or three boats, and we may presume that ships normally anchored outside in the small bay, protected from the north and north-west wind, and only entered the harbour to disembark men or goods. No large ships could have entered the harbour at all; the small craft (lembi) used to ferry Philocles' force across to Lechaion in 198 B.C. would have been most suitable.