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Shlayan, N.; Challapali, K.; Cavalcanti, D.; Oliveira, T.; Yang, Y. |
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Title |
A Novel Illuminance Control Strategy for Roadway Lighting Based on Greenshields Macroscopic Traffic Model |
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Journal Article |
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2018 |
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IEEE Photonics Journal |
Abbreviated Journal |
IEEE Photonics J. |
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10 |
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1 |
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1-11 |
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Lighting; Planning; Economics |
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Most street lights currently deployed have constant illumination levels or vary
based on a predetermined schedule. However, with advances in lighting controls, intelligent transportation systems, and the efforts of transportation agencies at regional and national levels to better sustain and manage the transportation system by monitoring the roadway network, many different types of real-time traffic data are available; which enables the implementation of a traffic responsive outdoor light system. The International Commission on Illumination (CIE) has proposed a class-based lighting control model based on a number of roadway parameters, some of which are traffic related. However, the adaptation of the available traffic data to the existing model is not obvious. In addition, the CIE model can be improved to better reflect traffic characteristics to increase energy efficiency of the overall street lighting system. The intention of this research is to quantify the relationship between real-time traffic, and roadway lighting and to develop a control strategy based on real-time traffic data in order to reduce light energy consumption, enhance safety, and maximize throughput of the roadway. Significant energy savings were observed when the proposed control strategy was implemented in two case studies using available lighting and traffic data for Washington, DC, and Montgomery County, MD, representing urban and rural roadway networks, respectively. |
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1943-0655 |
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GFZ @ kyba @ |
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1850 |
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Ahmed, AK; Sadik, MA |
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Study of sky brightness profiles of Baghdad and Karbala cities in Iraq |
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2018 |
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International Journal of Science and Nature |
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9 |
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1 |
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18-24 |
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Skyglow |
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This study was used two detectors only i.e., the human eye and photometer of Sky Quality Meter (SQM-LU) during the time of sunrise and sunset. The human eye used to determine the moon's phase. The measurements of sky brightness, by using SQM-LU, performed via two locations that covered Baghdad and Karbala in Iraq from December 2016 through March 2017 intermittently. The research focused only on light perceived by detectors and not how it happens. The aim of research is to find a mathematical formula (i.e . brightness contrast) between the sky brightness against the solar altitude by taking moon illumination as the standard reference. Analytical software based on the Python's PyEphem astrometry library was developed to calculate the solar altitude at the two locations. Finally, the formula of sky brightness obtained from this work is an important key that contributed to finding the simulated sky brightness, when the sun's altitude is known. |
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GFZ @ kyba @ |
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1851 |
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Scheuermaier, K.; Munch, M.; Ronda, J.M.; Duffy, J.F. |
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Improved cognitive morning performance in healthy older adults following blue-enriched light exposure on the previous evening |
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2018 |
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Behavioural Brain Research |
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Behav Brain Res |
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348 |
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267-275 |
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Human Health |
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OBJECTIVES: Exposure to light can have acute alerting and circadian phase-shifting effects. This study investigated the effects of evening exposure to blue-enriched polychromatic white (BEL) vs. polychromatic white light (WL) on sleep inertia dissipation the following morning in older adults. METHODS: Ten healthy older adults (average age=63.3 yrs; 6F) participated in a 13-day study comprising three baseline days, an initial circadian phase assessment, four days with 2-h evening light exposures, a post light exposure circadian phase assessment and three recovery days. Participants were randomized to either BEL or WL of the same irradiance for the four evening light exposures. On the next mornings at 2, 12, 22 and 32min after each wake time, the participants completed a 90-s digit-symbol substitution test (DSST) to assess working memory, and objective alertness was assessed using a wake EEG recording. DSST and power density from the wake EEG recordings were compared between the two groups. RESULTS: DSST performance improved with time awake (p<0.0001) and across study days in both light exposure groups (p<0.0001). There was no main effect of group, although we observed a significant day x group interaction (p=0.0004), whereby participants exposed to BEL performed significantly better on the first two mornings after light exposures than participants in WL (post-hoc, p<0.05). On those days, the BEL group showed higher EEG activity in some of the frequency bins in the sigma and beta range (p<0.05) on the wake EEG. CONCLUSION: Exposure to blue-enriched white light in the evening significantly improved DSST performance the following morning when compared to polychromatic white light. This was associated with a higher level of objective alertness on the wake EEG, but not with changes in sleep or circadian timing. |
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Division of Sleep and Circadian Disorders, Brigham and Women's Hospital, Boston, MA, United States; Division of Sleep Medicine, Harvard Medical School, Boston, MA, United States |
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0166-4328 |
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PMID:29684473 |
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GFZ @ kyba @ |
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1899 |
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Author |
Mulvin, D. |
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Title |
Media Prophylaxis: Night Modes and the Politics of Preventing Harm |
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2018 |
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Information & Culture |
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Information & Culture |
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53 |
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2 |
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175-202 |
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Human Health; Society |
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This article develops the term “media prophylaxis” to analyze the ways technologies are applied to challenges of calibrating one’s body with its environment and as defenses against endemic, human-made harms. In recent years, self-illuminated screens (like those of computers, phones, and tablets) have been identified by scientists, journalists, and concerned individuals as particularly pernicious sources of sleep-disrupting light. By tracing the history of circadian research, the effects of light on sleep patterns, and the recent appearance of software like “f.lux,” Apple’s “Night Shift,” and “Twilight,” this article shows how media-prophylactic technologies can individualize responsibility for preventing harm while simultaneously surfacing otherwise ignored forms of chronic suffering. |
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2164-8034 |
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GFZ @ kyba @ |
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1853 |
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Author |
Solano-Lamphar, H.A.; Kocifaj, M. |
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Title |
Numerical research on the effects the skyglow could have in phytochromes and RQE photoreceptors of plants |
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Journal Article |
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2018 |
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Journal of Environmental Management |
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J Environ Manage |
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209 |
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484-494 |
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Plants; Skyglow |
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The increase of artificial light at night has a terrible impact on organisms with nightlife patterns such as a migration, nutrition, reproduction and collective interaction. Plants are not free from this issue as they have life cycle events occurring not only yearly but also daily. Such events relate to daytime variations with seasons in which the flowers of deciduous trees bloom and the leaves of certain trees fall off and change color. A response of plants to artificial light at night still remains poorly quantified; but recent scientific research suggest that skyglow can disturb plants processes. For instance, low levels of light affect deciduous plants, which shed their leaves as days grow short in the fall. In this paper we model skyglow considering the features of artificial light that can affect natural processes of plants during the night. A case-study was conducted to mimic skyglow effects in real location for which experimental data exist. In our numerical simulations we found that some lighting systems can have an effect on plant photoreceptors and affect the phenology of plants. Specifically, the lamps that emit the electromagnetic energy in a wide spectral range can have greater effect on the photosensitivity of the plants. We believe the results obtained here will motivate botanists to make a targeted experiment to verify or challenge our findings. If the night light can change plant behavior under some conditions, it can have significant implications in botany, biology, or even agriculture. |
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ICA, Slovak Academy of Sciences, Dubravska Road 9, 845 03, Bratislava, Slovak Republic; Faculty of Mathematics, Physics, and Informatics, Comenius University, Mlynska Dolina, 842 48, Bratislava, Slovakia. Electronic address: kocifaj@savba.sk |
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0301-4797 |
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PMID:29316469 |
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GFZ @ kyba @ |
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1854 |
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