Central free-free-dominated 880 \micron emission in II Zw 40

The central star-forming region in a blue compact dwarf galaxy, II Zw 40, was observed in the 340 GHz (880 \micron) band at $\sim 5$ arcsec (250 pc) resolution with the Submillimetre Array (SMA). A source associated with the central star-forming complex was detected with a flux of $13.6\pm 2.0$ mJy. The structure is more extended than the beam in the east-west direction. The SMA 880 \micron flux is analyzed by using theoretical models of radio spectral energy distribution along with centimetre interferometric measurements in the literature. We find (i) that the SMA 880 \micron flux is dominated ($\sim 75$ per cent) by free-free emission from the central compact star-forming region, and (ii) that the contribution from dust emission to the SMA 880 \micron flux is at most $4\pm 2.5$ mJy. We also utilize our models to derive the radio--FIR relation of the II Zw 40 centre, suggesting that free-free absorption at low frequencies (\nu\la several GHz; \lambda\ga several cm) and spatial extent of dust affect the radio-FIR relation.Comment: 10 pages, 5 pages, accepted for publication in MNRA

Oxidation resistance of ODS alloy PM2000 from 880°C to 1400°C

Oxidation resistance of ODS alloy PM2000 from 880°C to 1400°

Continuous-wave Lasers in Polymer waveguides

Channel waveguides based on a polymer, 6-fluorinated-dianhydride/epoxy, which is actively doped with a rare-earth-ion-doped complex, Nd(thenoyltrifluoroacetone)3 1,10-phenanthroline, have been fabricated. Photoluminescence peaks at 880 nm, 1060 nm, and 1330 nm have been experimentally observed. By optimization of the fabrication\ud procedure of both, host material and optical structure, continuous-wave laser operation on both, the four-level and quasi-three-level transitions near 1060 nm and 880 nm, respectively, has been demonstrated in channel waveguides

Stop Violence against Philippine Garment Workers

The Clean Clothes Campaign calls attention to the repression and violence experienced by Philippine garment workers who attempted to organize.CCC_Philippines_11_21_06.pdf: 880 downloads, before Oct. 1, 2020

ALT Strategy, February 2011 to January 2014

The Association for Learning Technology (ALT) is an independent educational charity. ALT's charitable object is "to advance education through increasing, exploring and disseminating knowledge in the field of learning technology for the benefit of the general public". This document sets out our strategy for the three years February 2011 to January 2014. The strategy is reviewed and updated annually. Its main purpose is to: · translate ALT’s single charitable object into a practical strategy; · provide people and organisations inside and outside ALT with an overview of ALT’s approach; · set priority activities to shape the work of ALT’s committees, office-holders and staff

Developing 'authentic leaders' - the leaders' coaching journey

Jane Turner suggests that traditional leadership development programmes do not spend enough time focussing upon the inner person and that the modern leader needs to develop additional skills to flourish

A case study of boundary layer ventilation by convection and coastal processes

It is often assumed that ventilation of the atmospheric boundary layer is weak in the absence of fronts, but is this always true? In this paper we investigate the processes responsible for ventilation of the atmospheric boundary layer during a nonfrontal day that occurred on 9 May 2005 using the UK Met Office Unified Model. Pollution sources are represented by the constant emission of a passive tracer everywhere over land. The ventilation processes observed include shallow convection, turbulent mixing followed by large-scale ascent, a sea breeze circulation and coastal outflow. Vertical distributions of tracer are validated qualitatively with AMPEP (Aircraft Measurement of chemical Processing Export fluxes of Pollutants over the UK) CO aircraft measurements and are shown to agree impressively well. Budget calculations of tracers are performed in order to determine the relative importance of these ventilation processes. Coastal outflow and the sea breeze circulation were found to ventilate 26% of the boundary layer tracer by sunset of which 2% was above 2 km. A combination of coastal outflow, the sea breeze circulation, turbulent mixing and large-scale ascent ventilated 46% of the boundary layer tracer, of which 10% was above 2 km. Finally, coastal outflow, the sea breeze circulation, turbulent mixing, large-scale ascent and shallow convection together ventilated 52% of the tracer into the free troposphere, of which 26% was above 2 km. Hence this study shows that significant ventilation of the boundary layer can occur in the absence of fronts (and thus during high-pressure events). Turbulent mixing and convection processes can double the amount of pollution ventilated from the boundary layer