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Author Duriscoe, D.M.
Title Measuring Anthropogenic Sky Glow Using a Natural Sky Brightness Model. Type Journal Article
Year 2013 Publication Publications of the Astronomical Society of the Pacific Abbreviated Journal
Volume 125 Issue 933 Pages 1370-1382
Keywords Skyglow
Abstract Anthropogenic sky glow (a result of light pollution) combines with the natural background brightness of the night sky when viewed by an observer on the earth’s surface. In order to measure the anthropogenic component accurately, the natural component must be identified and subtracted. A model of the moonless natural sky brightness in the V-band was constructed from existing data on the Zodiacal Light, an airglow model based on the van Rhijn function, and a model of integrated starlight (including diffuse galactic light) constructed from images made with the same equipment used for sky brightness observations. The model also incorporates effective extinction by the atmosphere and is improved at high zenith angles (>80°) by the addition of atmospheric diffuse light. The model may be projected onto local horizon coordinates for a given observation at a resolution of 0.05° over the hemisphere of the sky, allowing it to be accurately registered with data images obtained from any site. Zodiacal Light and integrated starlight models compare favorably with observations from remote dark sky sites, matching within ± 8 nL over 95% of the sky. The natural airglow may be only approximately modeled, errors of up to ± 25 nL are seen when the airglow is rapidly changing or has considerable character (banding); ± 8 nL precision may be expected under favorable conditions. When subtracted from all-sky brightness data images, the model significantly improves estimates of sky glow from anthropogenic sources, especially at sites that experience slight to moderate light pollution.
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Call Number LoNNe @ christopher.kyba @ Serial 539
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Author Forbes, C.; Hammill, E.
Title Fear in the dark? Community-level effects of non-lethal predators change with light regime Type Journal Article
Year 2013 Publication Oikos Abbreviated Journal Oikos
Volume 122 Issue 12 Pages 1662-1668
Keywords Animals
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ISSN 0030-1299 ISBN Medium
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Call Number LoNNe @ kagoburian @ Serial 597
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Author Nimkingrat, P.; Khanam, S.; Strauch, O.; Ehlers, R.-U.
Title Hybridisation and selective breeding for improvement of low temperature activity of the entomopathogenic nematode Steinernema feltiae Type Journal Article
Year 2013 Publication BioControl Abbreviated Journal BioControl
Volume 58 Issue 3 Pages 417-426
Keywords Animals
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ISSN 1386-6141 ISBN Medium
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Call Number LoNNe @ kagoburian @ Serial 611
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Author Taylor, P.; Nimkingrat, P.; Strauch, O.; Ehlers, R.; Kiel, C.
Title Biocontrol Science and Technology Hybridisation and genetic selection for improving desiccation tolerance of the entomopathogenic nematode Steinernema feltiae Type Journal Article
Year 2013 Publication Abbreviated Journal
Volume Issue Pages 37–41
Keywords Animals
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Call Number LoNNe @ kagoburian @ Serial 622
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Author Ge, A.; Du, Z.; Wang, W.; Qiu, P.; Wang, J.; Cai, J.; Song, X.
Title A composite optical system for a LED based headlamp low beam module Type Journal Article
Year 2013 Publication Lighting Research and Technology Abbreviated Journal Lighting Research and Technology
Volume 45 Issue 6 Pages 752-757
Keywords Lighting
Abstract In this paper, we propose a composite optical system for automotive headlamps. The system is composed of a paraboloid collimating reflector, an off-axis paraboloid reflector, a baffle and an imaging len. By using a LED as the light source, precise light distribution can be achieved. When making ray-tracing simulation for the composite optical system in TracePro, a clear cut-off line can be seen on the measuring screen, as well as a hotspot at the centre. The power consumption for the LED light sources in this system is less than 10 W, resulting in an energy efficiency of more than 58% and a maximum illumination of 26.76 lux at the centre hotspot.
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ISSN 1477-1535 ISBN Medium
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Call Number LoNNe @ kagoburian @ Serial 632
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