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Author (up) Bapary, Mohammad AJ; Amin, Md Nurul; Takeuchi, Yuki; Takemura, Akihiro
Title The stimulatory effects of long wavelengths of light on the ovarian development in the tropical damselfish, Chrysiptera cyanea Type Journal Article
Year 2011 Publication Aquaculture Abbreviated Journal
Volume 314 Issue 1-4 Pages 188-192
Keywords animals; fish; reproduction
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Call Number LoNNe @ schroer @ Serial 1575
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Author (up) Bará, S.
Title Light pollution: Why should we care? Type Journal Article
Year 2014 Publication Second International Conference on Applications of Optics and Photonics Manuel Filipe P. C. Martins Costa; Rogério Nunes Nogueira Aveiro, Portugal, 2014 Abbreviated Journal Proc. SPIE 9286
Volume 9286 Issue Pages
Keywords Society; light pollution
Abstract The historical development of lighting technologies has been characterized by what evolution theorists call 'punctuated equilibrium': a succession of long periods of stable development followed by short periods of rapid change when key technological breakthroughs give rise to new lighting paradigms. Nowadays with the massive deployment of LED-based solid state lighting systems the illumination field is undergoing one of such accelerated transformation events. In parallel, a growing body of research has unveiled some of the complex interactions between the daily cycles of light and darkness and the regulating mechanisms of individuals, populations and ecosystems, including humans. This communication addresses some of the challenges that this new situation poses for the development of sustainable lighting systems.
Address Univ. de Santiago de Compostela, Spain; salva.bara@usc.es
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Publisher SPIE Place of Publication Editor
Language English Summary Language English Original Title
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Notes Approved no
Call Number IDA @ john @ Serial 1133
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Author (up) Bará, S.
Title Naked-eye astronomy: optics of the starry night skies Type Journal Article
Year 2014 Publication Proc. SPIE 9289, 12th Education and Training in Optics and Photonics Conference, 2014 Abbreviated Journal Proc. SPIE 9289
Volume 9289 Issue Pages
Keywords Society; light pollution
Abstract The world at night offers a wealth of stimuli and opportunities as a resource for Optics education, at all age levels and from any (formal, non formal or informal) perspective. The starry sky and the urban nightscape provide a unique combination of pointlike sources with extremely different emission spectra and brightness levels on a generally darker, locally homogeneous background. This fact, combined with the particular characteristics of the human visual system under mesopic and scotopic conditions, provides a perfect setting for experiencing first-hand different optical phenomena of increasing levels of complexity: from the eye's point spread function to the luminance contrast threshold for source detection, from basic diffraction patterns to the intricate irradiance fluctuations due to atmospheric turbulence. Looking at the nightscape is also a perfect occasion to raise awareness on the increasing levels of light pollution associated to the misuse of public and private artificial light at night, to promote a sustainable use of lighting, and to take part in worldwide citizen science campaigns. Last but not least, night sky observing activities can be planned and developed following a very flexible schedule, allowing individual students to carry them out from home and sharing the results in the classroom as well as organizing social events and night star parties with the active engagement of families and groups of the local community. This contribution describes these possibilities and introduces some of the free resources available to put them in practice.
Address Univ. de Santiago de Compostela, Spain; salva.bara@usc.es
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Publisher SPIE Place of Publication Editor
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Call Number IDA @ john @ Serial 1134
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Author (up) Bará, S.
Title Light pollution and solid-state lighting: reducing the carbon dioxide footprint is not enough Type Journal Article
Year 2014 Publication Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 87852G, 2013 Abbreviated Journal Proc. SPIE 8785
Volume 8785 Issue Pages
Keywords *Lighting; LED; light emitting diode; outdoor lighting; artificial light at night; lighting policy; solid-state lighting; blue light
Abstract Public and private lighting account for a relevant share of the overall electric power consumption worldwide. The pressing need of reducing the carbon dioxide emissions as well as of lowering the lumen•hour price tag has fostered the search for alternative lighting technologies to substitute for the incandescent and gas-discharge based lamps. The most successful approach to date, solid-state lighting, is already finding its way into the public lighting market, very often helped by substantial public investments and support. LED-based sources have distinct advantages: under controlled conditions their efficacy equals or surpasses that of conventional solutions, their small source size allows for an efficient collimation of the lightbeam (delivering the photons where they are actually needed and reducing lightspill on the surrounding areas), and they can be switched and/or dimmed on demand at very high rates, thus allowing for a tailored schedule of lighting. However, energy savings and carbon dioxide reduction are not the only crucial issues faced by present day lighting. A growing body of research has shown the significance of the spectral composition of light when it comes to assess the detrimental effects of artificial light-at-night (ALAN). The potential ALAN blueshift associated to the deployment of LED-based lighting systems has raised sensible concerns about its scientific, cultural, ecological and public health consequences, which can be further amplified if an increased light consumption is produced due to the rebound effect. This contribution addresses some of the challenges that these issues pose to the Optics and Photonics community.
Address Univ. de Santiago de Compostela, Spain; salva.bara@usc.es
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Publisher SPIE Place of Publication Editor
Language English Summary Language English Original Title
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Call Number IDA @ john @ Serial 1135
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Author (up) Bará, S.
Title Anthropogenic disruption of the night sky darkness in urban and rural areas Type Journal Article
Year 2016 Publication Royal Society Open Science Abbreviated Journal R. Soc. open sci.
Volume 3 Issue 10 Pages 160541
Keywords Skyglow
Abstract The growing emissions of artificial light to the atmosphere are producing, among other effects, a significant increase of the night sky brightness (NSB) above its expected natural values. A permanent sensor network has been deployed in Galicia (northwest of Iberian peninsula) to monitor the anthropogenic disruption of the night sky darkness in a countrywide area. The network is composed of 14 detectors integrated in automated weather stations of MeteoGalicia, the Galician public meteorological agency. Zenithal NSB readings are taken every minute and the results are openly available in real time for researchers, interested stakeholders and the public at large through a dedicated website. The measurements allow one to assess the extent of the loss of the natural night in urban, periurban, transition and dark rural sites, as well as its daily and monthly time courses. Two metrics are introduced here to characterize the disruption of the night darkness across the year: the significant magnitude (m1/3) and the moonlight modulation factor (γ). The significant magnitude shows that in clear and moonless nights the zenithal night sky in the analysed urban settings is typically 14–23 times brighter than expected from a nominal natural dark sky. This factor lies in the range 7–8 in periurban sites, 1.6–2.5 in transition regions and 0.8–1.6 in rural and mountain dark sky places. The presence of clouds in urban areas strongly enhances the amount of scattered light, easily reaching amplification factors in excess of 25, in comparison with the light scattered in the same places under clear sky conditions. The periodic NSB modulation due to the Moon, still clearly visible in transition and rural places, is barely notable at periurban locations and is practically lost at urban sites.
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ISSN 2054-5703 ISBN Medium
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Call Number LoNNe @ kyba @ Serial 1544
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