| |
Records |
Links |
|
Author |
Bará, S.; Nievas, M.; Sanchez de Miguel, A.; Zamorano, J. |
|
| |
Title |
Zernike analysis of all-sky night brightness maps |
Type |
Journal Article |
| |
Year |
2014 |
Publication |
Applied Optics |
Abbreviated Journal |
Appl Opt |
|
| |
Volume |
53 |
Issue |
12 |
Pages |
2677-2686 |
|
| |
Keywords |
modeling; light at night; light pollution; all-sky; Zernike polynomials; image decomposition; sky brightness |
|
| |
Abstract |
All-sky night brightness maps (calibrated images of the night sky with hemispherical field-of-view (FOV) taken at standard photometric bands) provide useful data to assess the light pollution levels at any ground site. We show that these maps can be efficiently described and analyzed using Zernike circle polynomials. The relevant image information can be compressed into a low-dimensional coefficients vector, giving an analytical expression for the sky brightness and alleviating the effects of noise. Moreover, the Zernike expansions allow us to quantify in a straightforward way the average and zenithal sky brightness and its variation across the FOV, providing a convenient framework to study the time course of these magnitudes. We apply this framework to analyze the results of a one-year campaign of night sky brightness measurements made at the UCM observatory in Madrid. |
|
| |
Address |
Ãrea de Óptica, Dept. de FÃsica Aplicada, Fac. de FÃsica, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Galicia, Spain |
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
Optical Society of America |
Place of Publication |
|
Editor |
|
|
| |
Language |
English |
Summary Language  |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0003-6935 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
PMID:24787595 |
Approved |
no |
|
| |
Call Number |
IDA @ john @ |
Serial |
318 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Sweater-Hickcox, K.; Narendran, N.; Bullough, J.; Freyssinier, J. |
|
| |
Title |
Effect of different coloured luminous surrounds on LED discomfort glare perception |
Type |
Journal Article |
| |
Year |
2013 |
Publication |
Lighting Research and Technology |
Abbreviated Journal |
Lighting Research and Technology |
|
| |
Volume |
45 |
Issue |
4 |
Pages |
464-475 |
|
| |
Keywords |
perception; subjective; LED; LED lighting; spectral power distribution; SPD |
|
| |
Abstract |
Recently, there has been increased interest in energy-efficient lighting as energy resources become higher in demand. Anecdotal evidence suggests that certain populations believe light-emitting diodes (LED) produce more glare than traditional technologies. This may be due to a number of factors such as spectral power distribution (SPD), source luminance, or beam intensity distribution. A study was conducted to assess the effect of different SPDs on the perception of discomfort glare from an LED source. For the range of conditions evaluated, the presence of any luminous surround significantly reduced the perception of discomfort glare from the LED array. The blue luminous surround reduced discomfort glare perception significantly less than the white or the yellow luminous surrounds. The implications for solid-state lighting systems are discussed. |
|
| |
Address |
Lighting Research Center, Rensselaer Polytechnic Institute, Troy, NY, USA |
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1477-1535 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
no |
|
| |
Call Number |
IDA @ john @ |
Serial |
338 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Shillo, R., & Halevy, A. H. |
|
| |
Title |
Interaction of photoperiod and temperature in flowering-control of Gypsophila paniculata L |
Type |
Journal Article |
| |
Year |
1982 |
Publication |
Scientia Horticulturae |
Abbreviated Journal |
|
|
| |
Volume |
16 |
Issue |
4 |
Pages |
385-393 |
|
| |
Keywords |
Plants |
|
| |
Abstract |
Long day promotes flowering of Gysophila paniculata L cultivar ‘Bristol Fairy’. Repeated treatments with GA3 or GA4 + 7 in short days did not promote flowering. The long photoperiod is effective only at relatively high temperatures. At night temperatures below 12°C, the plants remain vegetative even in long days. Efficient artificial lighting is from incandescent lamps at 60–100 lux. Fluorescent lighting (Cool-White) is not effective. Lighting of 4 hours as a night-break or at the end of the night were equally effective, but 4 hours lighting as a day-extension was less effective. Whole-night lighting promoted flowering more than any of the 4-hour lighting regimes. Cyclic lighting of one third light in each cycle promoted flowering to the same extent as continuous lighting. Light intensity during the day has a decisive effect on flower production. |
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
|
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
no |
|
| |
Call Number |
IDA @ intern @ |
Serial |
2370 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Johnson, A.; Phadke, A.; de la Rue du Cann, S. |
|
| |
Title |
Energy Savings Potential for Street Lighting in India |
Type |
Journal Article |
| |
Year |
2014 |
Publication |
Lawrence Berkely National Laboratory report |
Abbreviated Journal |
|
|
| |
Volume |
|
Issue |
|
Pages |
|
|
| |
Keywords |
Energy; India; South Asia |
|
| |
Abstract |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
|
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
no |
|
| |
Call Number |
LoNNe @ christopher.kyba @ |
Serial |
432 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Lyytimäki, J. |
|
| |
Title |
Nature's nocturnal services: Light pollution as a non-recognised challenge for ecosystem services research and management |
Type |
Journal Article |
| |
Year |
2013 |
Publication |
Ecosystem Services |
Abbreviated Journal |
Ecosystem Services |
|
| |
Volume |
3 |
Issue |
|
Pages |
e44-e48 |
|
| |
Keywords |
Economics; Ecosystem disservices; Ecosystem services; Environmental management; Light pollution; Scotoecology; Shifting baselines |
|
| |
Abstract |
Research focusing on ecosystem services has tackled several of the major drivers of environmental degradation, but it suffers from a blind spot related to light pollution. Light pollution caused by artificial night-time lighting is a global environmental change affecting terrestrial, coastal and marine ecosystems. The long-term effects of the disruption of the natural cycles of light and dark on ecosystem functioning and ecosystem services are largely unknown. Even though additional research is clearly needed, identifying, developing and implementing stringent management actions aimed at reducing inadequately installed, unnecessary or excessive lighting are well justified. This essay argues that management is hampered, because ecosystem services from nocturnal nature are increasingly underappreciated by the public due to shifting baseline syndrome, making most people accustomed to constantly illuminated and light-polluted night environments. Increased attention from scientists, managers and the public is needed in order to explicate the best options for preserving the benefits from natural darkness. |
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
2212-0416 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
no |
|
| |
Call Number |
LoNNe @ christopher.kyba @ |
Serial |
433 |
|
| Permanent link to this record |
