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Author Pattison, P.M.; Tsao, J.Y.; Brainard, G.C.; Bugbee, B.
Title LEDs for photons, physiology and food Type Journal Article
Year 2018 Publication Nature Abbreviated Journal Nature
Volume 563 Issue 7732 Pages 493-500
Keywords Review; Lighting; Human Health; Plants
Abstract Lighting based on light-emitting diodes (LEDs) not only is more energy efficient than traditional lighting, but also enables improved performance and control. The colour, intensity and distribution of light can now be controlled with unprecedented precision, enabling light to be used both as a signal for specific physiological responses in humans and plants, and as an efficient fuel for fresh food production. Here we show how a broad and improved understanding of the physiological responses to light will facilitate greater energy savings and provide health and productivity benefits that have not previously been associated with lighting.
Address Utah State University, Logan, UT, USA
Corporate Author Thesis
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Language English Summary Language Original Title
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ISSN 0028-0836 ISBN Medium
Area Expedition Conference
Notes PMID:30464269 Approved no
Call Number GFZ @ kyba @ Serial (down) 2110
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Author Figura, J.; Haughwout, C.; Cahoy, K.; Welle, R.; Hardy, B.; Pack, D.; Bosh, A.
Title Initial Demonstration of an Uplink LED Beacon to a Low Earth Orbiting CubeSat Type Journal Article
Year 2018 Publication Journal of Small Satellites Abbreviated Journal
Volume 7 Issue 2 Pages 719-732
Keywords Remote Sensing
Abstract In this study, an uplink light-emitting diode (LED) beacon that can enable a CubeSat to locate a laser communication ground station was designed, constructed, and tested, and detection of the beacon from low Earth orbit (LEO) with a CMOS camera on the AeroCube-5 CubeSat was demonstrated. The LED beacon described is an alternative to the near-infrared laser beacons commonly used in laser communication systems, and has the potential to be cheaper, easier to point, and to require less regulatory coordination than a laser beacon, while performing the same function. An optical design is detailed, consisting of an array of 80 green LEDs with a center wavelength of 528 nm, producing 15.9 watts of free-space optical power, focused to a beamwidth of 8.12 degrees full-widthhalf-max (FWHM). A link budget is presented that shows the beacon is detectable by a CubeSat-mounted camera with a 7.9 mm diameter aperture and a silicon CMOS detector. A prototype beacon comprised of an LED array, focusing optics, thermal control, and tracking mechanisms was designed and constructed, and laboratory measurements of the beam profile and optical power of the prototype beacon using an optical power meter are presented herein. A field test is also described, in which the beacon was deployed at Wallace Astrophysical Observatory in the early morning of May 15, 2017 and imaged with a camera on AeroCube-5. The array is successfully identified in a sequence of five images taken by the CubeSat, demonstrating the viability of LED uplink beacons with CubeSat imagers.
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Notes Approved no
Call Number NC @ ehyde3 @ Serial (down) 2108
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Author Van Tatenhove, A.; Fayet, A.; Watanuki, Y.; Yoda, K.; Shoji, A.
Title Streaked Shearwater Calonectris leucomelas moonlight avoidance in response to low aerial predation pressure, and effects of wind speed and direction on colony attendance Type Journal Article
Year 2018 Publication Marine Ornithology Abbreviated Journal
Volume 46 Issue Pages 177-185
Keywords Moonlight
Abstract Many species of Procellaridae are nocturnal on their breeding grounds, exhibiting reduced activity during fuller moonlight, perhaps to avoid predation by predators that use the full moon to hunt after sunset. Among these nocturnal species, Streaked Shearwaters Calonectris leucomelas have high wing loading and have difficulty taking off—especially with unfavorable wind conditions—thus potentially exacerbating moonlight avoidance. Effects of moonlight and wind conditions on the colony activity of this species, however, is poorly understood. We investigated the phenomenon by counting the departure and arrival of birds, and measuring ambient light intensity, local wind speed, and local wind direction at a breeding colony of Streaked Shearwaters on Awashima Island, Japan. Moon phase and ambient light had no significant effect on the frequency of arrivals or departures. Frequency of departures decreased significantly with increasing wind speed, but no effect was seen on arrivals, and wind direction had no effect on arrivals or departures. Our results indicate that: (1) wind speed may play an important role in Streaked Shearwater takeoff from the colony, and (2) moonlight avoidance is a plastic trait that may diminish in large-bodied shearwaters when few diurnal aerial predators are present.
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Notes Approved no
Call Number NC @ ehyde3 @ Serial (down) 2107
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Author Price, J.T.; Drye, B.; Domangue, R.J.; Paladino, F.V.
Title Exploring The Role of Artificial Lighting in Loggerhead Turtle (Caretta caretta) Nest-Site Selection and Hatchling Disorientation Type Journal Article
Year 2018 Publication Herpetological Conservation and Biology Abbreviated Journal
Volume 13 Issue 2 Pages 415-422
Keywords Animals
Abstract Beachfront artificial lighting can deter nesting sea turtles and disrupt the seaward orientation of hatchlings following their emergence from the nest. We investigated the effects of variable artificial lighting along the 17.5-km beachfront of St. George Island, Florida, USA on both nesting and hatchling Loggerhead Turtles (Caretta caretta). We hypothesized that illumination affects nest-site selection and hatchling orientation of Loggerhead Turtles. We predicted that zones with higher artificial luminance levels would have a reduced number of nests laid by Loggerhead Turtles, as well as an increased hatchling disorientation rate. We divided the beachfront into zones 500 m in length and recorded nighttime luminance measurements with a photometer throughout the 2015 nesting season. The 2015 luminance values were analyzed together with Loggerhead Turtle nesting data from the 2015 season, as well as related to a longer-term dataset from 2011–2015. We found a negative relationship between nestsite selection and the intensity of artificial luminance, such that the brighter zones along the beachfront had fewer nests. Within this relationship, we found that nest density was significantly lower above a beachfront luminance value of ~800 μcd/m2. Finally, we found that hatchling disorientations occurred more frequently in zones with greater luminance. While many factors can affect nesting and hatchling Loggerhead behavior, our results suggest that variable intensities of artificial lighting at a nesting site may lead to a spatially clumped arrangement of nests and hatchling disorientations. These results can help improve the conservation and protection of nesting habitat as they further our understanding of the effects of artificial beachfront lighting on Loggerhead Turtles.
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Notes Approved no
Call Number NC @ ehyde3 @ Serial (down) 2106
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Author Lee, S-H.; Lim, H-S.
Title A Study on Sky Light Pollution based on Sky Glow in Jeju Island Type Journal Article
Year 2018 Publication Journal of the Architectural Institute of Korea Abbreviated Journal
Volume 34 Issue 4 Pages 83-91
Keywords Skyglow
Abstract Artificial lighting contributes greatly to developing civilizations. It allows daytime activities to continue throughout the dark hours of the day and thus increasing work productivity as well as allowing people to enjoy nighttime activities. In addition, artificial lighting is used to beautify landscapes, architectural monuments, and thus highlighting the social-economic development of a given place. However, excessive and improper usage of artificial lighting can lead to light pollution. Light pollution is a serious issue that is detrimental to human health. It has been linked to a number of health conditions including sleep disorder, visual discomfort as well as cancer. The effects of light pollution extend throughout the entire ecosystem, affecting both plants and animals. Furthermore, sky-glow from light pollution hinders astronomical observation. The current paper presents a study conducted on lit environment of a nightscape. The quality of the sky was measured in 144 spots using Sky Quality Meter (SQM) devices. The measured spots were chosen on the basis of land use as well as distance from the Halla Mountain.
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Language Summary Language Original Title
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Notes Approved no
Call Number NC @ ehyde3 @ Serial (down) 2105
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