EFRC Bulletin 76 January 2005. With technical Updates from the Organic Advisory Service

The regular report from Elm Farm Research Centre - the Organic Research Centre in the UK - covering its own research and information and that of other relevant issue

Administering Water Rights: The Permit System

69 pages. Contains references

FERC, PURPA and the Federal Power Act

62 pages. Contains references

FERC, PURPA and the Federal Power Act

62 pages. Contains references

Administering Water Rights: The Permit System

69 pages. Contains references

Elm Farm Research Centre Bulletin 82 February 2006

Regular newsletter with technical updates from the Organic Advisory Service Issue covers: organic sector payments, dietary health choices, avian influenza vaccination, tradable quotas, feeding cities, sewage sludge, organic aquaculture, organic poultry, biodiversity and productivity research, organic winter wheat varieties, linking farmers and scientists, Interreg Project, RAFAEL energy use greenhouse gas emissions food and farming

Elm Farm Research Centre Bulletin with Technical Updates from the Organic Advisory Service 80

A collection of technical, policy and research articles on organic food and food system

Elm Farm Research Centre Bulletin 79 July 2005

Regular newletter from Elm Farm Research Centre (EFRC)covering research, technical and policy articles, views and comment

The KX method for producing K-band flux-limited samples of quasars

The longstanding question of the extent to which the quasar population is affected by dust extinction, within host galaxies or galaxies along the line of sight, remains open. More generally, the spectral energy distributions of quasars vary significantly and flux-limited samples defined at different wavelengths include different quasars. Surveys employing flux measurements at widely separated wavelengths are necessary to characterise fully the spectral properties of the quasar population. The availability of panoramic near-infrared detectors on large telescopes provides the opportunity to undertake surveys capable of establishing the importance of extinction by dust on the observed population of quasars. We introduce an efficient method for selecting K-band, flux-limited samples of quasars, termed ``KX'' by analogy with the UVX method. This method exploits the difference between the power-law nature of quasar spectra and the convex spectra of stars: quasars are relatively brighter than stars at both short wavelengths (the UVX method) and long wavelengths (the KX method). We consider the feasibility of undertaking a large-area KX survey for damped Ly-alpha galaxies and gravitational lenses using the planned UKIRT wide-field near-infrared camera.Comment: 6 pages, 3 figures, to appear in MNRA