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Author Scheffler, T.; Kyba, C.C.M.
Title Measuring Social Jetlag in Twitter Data Type Conference Article
Year 2016 Publication Proceedings of the Tenth International AAAI Conference on Web and Social Media (ICWSM 2016) Abbreviated Journal
Volume Issue (up) Pages 675-678
Keywords Human Health; Sunlight; Society
Abstract Social constraints have replaced the natural cycle of light and darkness as the main determinant of wake-up and activity times for many people. In this paper we show how Twitter activity can be used as a source of large-scale, naturally occurring data for the study of circadian rhythm in humans. Our year-long initial study is based on almost 1.5 million observations by over 200,000 users. The progression of the onset of Twitter activity times on free days in the course of the year is consistent with previous survey-based research on wake

times. We show that the difference in wake-up time (implicating lack of sleep) on weekdays compared to Sundays is between 1 hour and over 2 hours depending on the time of year. The data also supports the assertion that Daylight Saving Time greatly disrupts the easing of social jetlag in the Spring transition.
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Area Expedition Conference ICWSM 2016
Notes Approved no
Call Number LoNNe @ kyba @ Serial 1453
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Author Spitschan, M.; Aguirre, G.K.; Brainard, D.H.; Sweeney, A.M.
Title Variation of outdoor illumination as a function of solar elevation and light pollution Type Journal Article
Year 2016 Publication Scientific Reports Abbreviated Journal Sci Rep
Volume 6 Issue (up) Pages 26756
Keywords Skyglow; Measurements; light pollution; daylight; twilight; sky brightness; spectral irradiance; CIE
Abstract The illumination of the environment undergoes both intensity and spectral changes during the 24 h cycle of a day. Daylight spectral power distributions are well described by low-dimensional models such as the CIE (Commission Internationale de l'Eclairage) daylight model, but the performance of this model in non-daylight regimes is not characterised. We measured downwelling spectral irradiance across multiple days in two locations in North America: One rural location (Cherry Springs State Park, PA) with minimal anthropogenic light sources, and one city location (Philadelphia, PA). We characterise the spectral, intensity and colour changes and extend the existing CIE model for daylight to capture twilight components and the spectrum of the night sky.
Address Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
Corporate Author Thesis
Publisher Nature Place of Publication Editor
Language English Summary Language English Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2045-2322 ISBN Medium
Area Expedition Conference
Notes PMID:27272736 Approved no
Call Number IDA @ john @ Serial 1464
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Author Gutierrez-Escolar, A.; Castillo-Martinez, A.; Gomez-Pulido, J.; Gutierrez-Martinez, J.-M.; González-Seco, E.; Stapic, Z.
Title A review of energy efficiency label of street lighting systems Type Journal Article
Year 2016 Publication Energy Efficiency Abbreviated Journal Energy Efficiency
Volume Issue (up) Pages 1-18
Keywords Energy; Energy Efficiency Index; Total Luminous Flux; Energy Efficiency Label; Electronic Ballast; Energy Performance Indicator; Lighting Project; Energy Efficiency Class; Energy Efficiency Level; Road Lighting; Active PowerLighting System; Wind Turbine; Current Energy Efficiency; Luminous Efficacy; Electricity Consumption; Kiviat diagram; Lamp; Light pollution; Pie chart; Dimming luminous flux; review
Abstract There are very few countries that have provisions addressing the energy efficiency of the whole street lighting system, such as Spain or the Netherlands. Nevertheless, there is not an agreement about how energy efficiency must be assessed. The Spanish Government contemplates it in the Royal Decree 1890/2008 with the goal of improving energy savings and efficiency. However, this has not obtained the expected results. Nowadays, energy efficiency of this kind of systems is assessed using a label. In the case of Spain, this label only assesses one magnitude. The contributions of this paper are two evaluation systems (kiviat diagram and pie chart) which assess five magnitudes: lamps, energy efficiency index, light pollution, renewable energy contribution, and harness of the luminous flux using dimming. After that, a survey was done to study several subjects: (1) if citizens are aware about the efficiency of street lighting systems, (2) whether the sample of colors used in the label is adequate, and (3) if our proposed systems could replace the current evaluation system. Finally, the paper finishes with the conclusions of the survey.
Address Department of Computer Sciences, Polytechnic School, University of Alcala, Road Madrid-Barcelona, Km 33.6, Alcala de Henares, 28871, Spain
Corporate Author Thesis
Publisher Springer Place of Publication Editor
Language English Summary Language English Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1570-6478 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number IDA @ john @ Serial 1471
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Author Chen, H.; Sun, C.; Chen, X.; Chiang, K.; Xiong, X.
Title On-orbit calibration and performance of S-NPP VIIRS DNB Type Conference Article
Year 2016 Publication Proc. SPIE 9881, Earth Observing Missions and Sensors: Development, Implementation, and Characterization IV, 98812B (May 2, 2016) Abbreviated Journal Proc. SPIE 9881
Volume Issue (up) Pages
Keywords Remote Sensing; VIIRS, Suomi; VIIRS DNB; day-night band; calibration; Land Science Investigator-led Processing Systems; SIPS; Orbital dynamics; Sensors; Stray light; Contamination; Diffusers; Earth sciences; Equipment and services
Abstract The S-NPP VIIRS instrument has successfully operated since its launch in October 2011. The VIIRS Day-Night Band (DNB) is a panchromatic channel covering wavelengths from 0.5 to 0.9 μm that is capable of observing Earth scenes during both day and nighttime orbits at a spatial resolution of 750 m. To cover the large dynamic range, the DNB operates at low, mid, or high gain stages, and it uses an onboard solar diffuser (SD) for its low gain stage calibration. The SD observations also provide a means to compute gain ratios of low-to-mid and mid-to-high gain stages. This paper describes the DNB on-orbit calibration methodologies used by the VIIRS Characterization Support Team (VCST) in supporting the NASA earth science community with consistent VIIRS sensor data records (SDRs) made available by the Land Science Investigator-led Processing Systems (SIPS). It provides an assessment and update of DNB on-orbit performance, including the SD degradation in the DNB spectral range, detector gain and gain ratio trending, stray light contamination and its correction. Also presented in this paper are performance validations based on earth scenes and lunar observations.
Address Science Systems and Applications, Inc.
Corporate Author Thesis
Publisher SPIE Place of Publication Editor
Language English Summary Language English Original Title
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Area Expedition Conference
Notes Approved no
Call Number IDA @ john @ Serial 1473
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Author Schroer, S.; Felsmann, K.; Hölker, F.; Mummert, S.; Monaghan, M.T.; Wurzbacher, C.; Premke, K.
Title The impact of outdoor lighting on ecosystem function – gaining information with a Citizen Science approach using a questionnaire Type Conference Article
Year 2016 Publication Austrian Citizen Science Conference Abbreviated Journal
Volume Issue (up) Pages 8-13
Keywords citizen science; mapping
Abstract
Address
Corporate Author Thesis
Publisher Frontiers Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
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Area Expedition Conference
Notes Approved no
Call Number LoNNe @ schroer @ Serial 1572
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