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Author Muheim, R.; Phillips, J.B.; Akesson, S.
Title Polarized light cues underlie compass calibration in migratory songbirds Type Journal Article
Year 2006 Publication Science (New York, N.Y.) Abbreviated Journal Science
Volume 313 Issue 5788 Pages 837-839
Keywords Alaska; *Animal Migration; Animals; Calibration; Cues; *Flight, Animal; Geography; *Light; Magnetics; *Orientation; Seasons; Sparrows/*physiology; Sunlight
Abstract Migratory songbirds use the geomagnetic field, stars, the Sun, and polarized light patterns to determine their migratory direction. To prevent navigational errors, it is necessary to calibrate all of these compass systems to a common reference. We show that migratory Savannah sparrows use polarized light cues from the region of sky near the horizon to recalibrate the magnetic compass at both sunrise and sunset. We suggest that skylight polarization patterns are used to derive an absolute (i.e., geographic) directional system that provides the primary calibration reference for all of the compasses of migratory songbirds.
Address Department of Animal Ecology, Lund University, Ecology Building, SE-223 62 Lund, Sweden. rmuheim@vt.edu
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Language English Summary Language (up) Original Title
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ISSN 0036-8075 ISBN Medium
Area Expedition Conference
Notes PMID:16902138 Approved no
Call Number IDA @ john @ Serial 243
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Author Xavier Kerola, D.
Title Modelling artificial night-sky brightness with a polarized multiple scattering radiative transfer computer code: Modelling artificial night-sky brightness Type Journal Article
Year 2006 Publication Monthly Notices of the Royal Astronomical Society Abbreviated Journal
Volume 365 Issue 4 Pages 1295-1299
Keywords Skyglow; modeling; radiative transfer; Gauss-Seidel; light pollution; Garstang model
Abstract As part of an ongoing investigation of radiative effects produced by hazy atmospheres, computational procedures have been developed for use in determining the brightening of the night sky as a result of urban illumination. The downwardly and upwardly directed radiances of multiply scattered light from an offending metropolitan source are computed by a straightforward Gauss-Seidel (G-S) iterative technique applied directly to the integrated form of Chandrasekhar's vectorized radiative transfer equation. Initial benchmark night-sky brightness tests of the present G-S model using fully consistent optical emission and extinction input parameters yield very encouraging results when compared with the double scattering treatment of Garstang, the only full-fledged previously available model.
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ISSN 0035-8711 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number IDA @ john @ Serial 278
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Author Fouquet, R.; Pearson, P.J.
Title Seven centuries of energy services: The price and use of light in the United Kingdom (1300-2000) Type Journal Article
Year 2006 Publication Energy Journal Abbreviated Journal
Volume 27 Issue Pages 139-177
Keywords Energy; Economics
Abstract Before the mid-eighteenth century, most people lived in near-complete

darkness except in the presence of sunlight and moonlight. Since then, the provision

of artificial light has been revolutionised by a series of innovations in appliances,

fuels, infrastructures and institutions that have enabled the growing demands of

economic development for artificial light to be met at dramatically lower costs:

by the year 2000, while United Kingdom GDP per capita was 15 times its 1800

value, lighting services cost less than one three thousandth of their 1800 value,

per capita use was 6,500 times greater and total lighting consumption was 25,000

times higher than in 1800. The economic history of light shows how focussing on

developments in energy service provision rather than simply on energy use and

prices can reveal the ‘true’ declines in costs, enhanced levels of consumption

and welfare gains that have been achieved. While emphasising the value of past

experience, the paper also warns against the dangers of over-reliance on past

trends for the long-run forecasting of energy consumption given the potential for the

introduction of new technologies and fuels, and for rebound and saturation effects.
Address
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Notes Approved no
Call Number LoNNe @ christopher.kyba @ Serial 441
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Author Marchant, P.R.
Title Investigating whether a crime reduction measure works Type Journal Article
Year 2006 Publication Radical Statistics Abbreviated Journal
Volume 91 Issue Pages
Keywords Public Safety
Abstract Crime is a serious business. It causes great distress and fear. It costs a lot

to deal with its consequences. In these regards crime shares much with

the problem of ill-health and disease. The application of sound science and

statistics has allowed great strides to be made in dealing with problems of

ill health. Medical statistics is one of the recognised, established

disciplines involved in researching healthcare.

The parallels between research in crime reduction and in healthcare do

appear to differ in terms of quality. Although there is still room for

considerable improvement in researching health-care, an investigation

into the underpinning of statistical methods used indicates that the

problems are substantially worse in the study of crime. The consideration

given to statistics in crime studies seems rather flimsy, yet important

claims are made which are statistical at source and may affect policy, and

so can have considerable costs attached. Therefore, for example, it is

important to know whether the underlying crime level has really changed,

rather than just being the result of perhaps sampling variation or some

artefact giving rise to statistical bias or systematic error. This is necessary

when trying to determine whether a Crime Reduction Intervention (CRI)

has actually worked.

I started examining the scientific basis of the claim for the effectiveness for

one particular CRI, basically because I was concerned about negative side

effects and I thought the claim implausible. I remain concerned and

unconvinced. The statistical issues and concerns I raise apply also to

investigating other CRIs and to existing published analyses.

This piece extends work presented in Marchant (2006); earlier work on the

statistical issues involved can be found in Marchant (2005a, b; 2004).
Address
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Notes Approved no
Call Number LoNNe @ christopher.kyba @ Serial 452
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Author Rich, C.; Longcore, T.; editors
Title Ecological Consequences of Artificial Night Lighting Type Journal Article
Year 2006 Publication Island Press. Abbreviated Journal
Volume Issue Pages
Keywords Ecology
Abstract
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Notes Approved no
Call Number LoNNe @ christopher.kyba @ Serial 479
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