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51.
M. J. Meyer M. A. Zwaan R. L. Webster L. Staveley-Smith E. Ryan-Weber M. J. Drinkwater D. G. Barnes M. Howlett V. A. Kilborn J. Stevens M. Waugh M. J. Pierce R. Bhathal W. J. G. de Blok M. J. Disney R. D. Ekers K. C. Freeman D. A. Garcia B. K. Gibson J. Harnett P. A. Henning H. Jerjen M. J. Kesteven P. M. Knezek B. S. Koribalski S. Mader M. Marquarding R. F. Minchin J. O'Brien T. Oosterloo R. M. Price M. E. Putman S. D. Ryder E. M. Sadler I. M. Stewart F. Stootman A. E. Wright 《Monthly notices of the Royal Astronomical Society》2004,350(4):1195-1209
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M. A. Zwaan M. J. Meyer R. L. Webster L. Staveley-Smith M. J. Drinkwater D. G. Barnes R. Bhathal W. J. G. de Blok M. J. Disney R. D. Ekers K. C. Freeman D. A. Garcia B. K. Gibson J. Harnett P. A. Henning M. Howlett H. Jerjen M. J. Kesteven V. A. Kilborn P. M. Knezek B. S. Koribalski S. Mader M. Marquarding R. F. Minchin J. O'Brien T. Oosterloo M. J. Pierce R. M. Price M. E. Putman E. Ryan-Weber S. D. Ryder E. M. Sadler J. Stevens I. M. Stewart F. Stootman M. Waugh A. E. Wright 《Monthly notices of the Royal Astronomical Society》2004,350(4):1210-1219
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J.M. van der Hulst E.M. Sadler C.A. Jackson L.K. Hunt M. Verheijen J.H. van Gorkom 《New Astronomy Reviews》2004,48(11-12):1221
The unsurpassed sensitivity and resolution of the Square Kilometer Array (SKA) will make it possible for the first time to probe the continuum emission of normal star forming galaxies out to the edges of the universe. This opens the possibility for routinely using the radio continuum emission from galaxies for cosmological research as it offers an independent probe of the evolution of the star formation density in the universe. In addition it offers the possibility to detect the first star forming objects and massive black holes.In deep surveys SKA will be able to detect Hi in emission out to redshifts of z ≈ 2.5 and hence be able to trace the conversion of gas into stars over an era where considerable evolution is taking place. Such surveys will be able to uniquely determine the respective importance of merging and accreting gas flows for galaxy formation over this redshift range (i.e. out to when the universe was only one third its present age). It is obvious that only SKA will able to see literally where and how gas is turned into stars.These and other aspects of SKA imaging of galaxies will be discussed. 相似文献
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Elaine M. Sadler Carole A. Jackson Russell D. Cannon Vincent J. McIntyre Tara Murphy Joss Bland-Hawthorn Terry Bridges Shaun Cole Matthew Colless Chris Collins Warrick Couch Gavin Dalton Roberto De Propris Simon P. Driver George Efstathiou Richard S. Ellis Carlos S. Frenk Karl Glazebrook Ofer Lahav Ian Lewis Stuart Lumsden Steve Maddox Darren Madgwick Peder Norberg John A. Peacock Bruce A. Peterson Will Sutherland Keith Taylor 《Monthly notices of the Royal Astronomical Society》2002,329(1):227-245
We have cross-matched the 1.4-GHz NRAO VLA Sky Survey (NVSS) with the first 210 fields observed in the 2dF Galaxy Redshift Survey (2dFGRS), covering an effective area of 325 deg2 (about 20 per cent of the final 2dFGRS area). This yields a set of optical spectra of 912 candidate NVSS counterparts, of which we identify 757 as genuine radio identifications – the largest and most homogeneous set of radio source spectra ever obtained. The 2dFGRS radio sources span the redshift range to 0.438, and are a mixture of active galaxies (60 per cent) and star-forming galaxies (40 per cent). About 25 per cent of the 2dFGRS radio sources are spatially resolved by NVSS, and the sample includes three giant radio galaxies with projected linear size greater than 1 Mpc. The high quality of the 2dF spectra means we can usually distinguish unambiguously between AGN and star-forming galaxies. We make a new determination of the local radio luminosity function at 1.4 GHz for both active and star-forming galaxies, and derive a local star formation density of . 相似文献
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David Sadler 《Geoforum》2004,35(1):35-46
There is a growing geographical literature on the significance of organised labour. A key theoretical and political question concerns the extent and nature of the engagement between trade unions and other groups in the broader community. The paper seeks to contribute to this debate by focusing specifically on the ways in which trade unions engage collaboratively with such interest groups over international corporate campaign issues. It draws upon a case study of the encounter between Australia’s Construction, Forestry, Mining and Energy Union (CFMEU) and Rio Tinto, one of the largest privately owned mining companies in the world. This was conducted through a loose alliance co-ordinated by the International Federation of Chemical, Energy, Mining and General Workers Unions (ICEM). The campaign included the use of stakeholder reports aimed at influencing corporate shareholders. The main issues concerned the rights of indigenous peoples, environmental consequences of mining operations, and human rights in the workplace. The attempt to change these aspects of corporate culture led to union-inspired resolutions at the firm’s May 2000 Annual General Meeting, the first attempt to challenge a company through international union-led action in this manner. Although defeated, the resolutions were backed by a significant minority of leading institutional shareholders. The paper interprets this campaign in terms of broader debates over the spatiality of organised labour and the role of trade unions, at a time when increased significance has been attached to alternative political movements. It seeks to theorise the specific implications of internationally-grounded interest-based campaigns and take into account the ways in which these are both constrained by, and draw strength from, their constitution at this spatial scale. 相似文献
59.
Inter‐annual variability in the effects of riparian woodland on micro‐climate,energy exchanges and water temperature of an upland Scottish stream
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Grace Garner Iain A. Malcolm Jonathan P. Sadler Colin P. Millar David M. Hannah 《水文研究》2015,29(6):1080-1095
The influence of riparian woodland on stream temperature, micro‐climate and energy exchange was investigated over seven calendar years. Continuous data were collected from two reaches of the Girnock Burn (a tributary of the Aberdeenshire Dee, Scotland) with contrasting land use characteristics: (1) semi‐natural riparian forest and (2) open moorland. In the moorland reach, wind speed and energy fluxes (especially net radiation, latent heat and sensible heat) varied considerably between years because of variable riparian micro‐climate coupled strongly to prevailing meteorological conditions. In the forested reach, riparian vegetation sheltered the stream from meteorological conditions that produced a moderated micro‐climate and thus energy exchange conditions, which were relatively stable between years. Net energy gains (losses) in spring and summer (autumn and winter) were typically greater in the moorland than the forest. However, when particularly high latent heat loss or low net radiation gain occurred in the moorland, net energy gain (loss) was less than that in the forest during the spring and summer (autumn and winter) months. Spring and summer water temperature was typically cooler in the forest and characterised by less inter‐annual variability due to reduced, more inter‐annually stable energy gain in the forested reach. The effect of riparian vegetation on autumn and winter water temperature dynamics was less clear because of the confounding effects of reach‐scale inflows of thermally stable groundwater in the moorland reach, which strongly influenced the local heat budget. These findings provide new insights as to the hydrometeorological conditions under which semi‐natural riparian forest may be effective in mitigating river thermal variability, notably peaks, under present and future climates. © 2014 The Authors. Hydrological Processes published by John Wiley & Sons Ltd. 相似文献
60.
Marcella Massardi Ronald D. Ekers Tara Murphy Roberto Ricci Elaine M. Sadler Sarah Burke Gianfranco De Zotti Philip G. Edwards Paul J. Hancock Carole A. Jackson Michael J. Kesteven Elizabeth Mahony Christopher J. Phillips Lister Staveley-Smith Ravi Subrahmanyan Mark A. Walker Warwick E. Wilson 《Monthly notices of the Royal Astronomical Society》2008,384(2):775-802
The Australia Telescope 20-GHz (AT20G) Survey is a blind survey of the whole southern sky at 20 GHz (with follow-up observations at 4.8 and 8.6 GHz) carried out with the Australia Telescope Compact Array from 2004 to 2007.
The Bright Source Sample (BSS) is a complete flux-limited subsample of the AT20G Survey catalogue comprising 320 extragalactic ) radio sources south of δ=−15° with Jy. Of these, 218 have near simultaneous observations at 8 and 5 GHz.
In this paper we present an analysis of radio spectral properties in total intensity and polarization, size, optical identifications and redshift distribution of the BSS sources. The analysis of the spectral behaviour shows spectral curvature in most sources with spectral steepening that increases at higher frequencies (the median spectral index α, assuming S ∝να , decreases from α8.6 4.8 = 0.11 between 4.8 and 8.6 GHz to α20 8.6 =−0.16 between 8.6 and 20 GHz), even if the sample is dominated by flat spectra sources (85 per cent of the sample has α20 8.6 > −0.5) . The almost simultaneous spectra in total intensity and polarization allowed us a comparison of the polarized and total intensity spectra: polarized fraction slightly increases with frequency, but the shapes of the spectra have little correlation. Optical identifications provided an estimation of redshift for 186 sources with a median value of 1.20 and 0.13, respectively, for QSO and galaxies. 相似文献
The Bright Source Sample (BSS) is a complete flux-limited subsample of the AT20G Survey catalogue comprising 320 extragalactic ) radio sources south of δ=−15° with Jy. Of these, 218 have near simultaneous observations at 8 and 5 GHz.
In this paper we present an analysis of radio spectral properties in total intensity and polarization, size, optical identifications and redshift distribution of the BSS sources. The analysis of the spectral behaviour shows spectral curvature in most sources with spectral steepening that increases at higher frequencies (the median spectral index α, assuming S ∝ν