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Chang, S.; Wang, J.; Zhang, F.; Niu, L.; Wang, Y. |
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A study of the impacts of urban expansion on vegetation primary productivity levels in the Jing-Jin-Ji region, based on nighttime light data |
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Journal Article |
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2020 |
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Journal of Cleaner Production |
Abbreviated Journal |
Journal of Cleaner Production |
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263 |
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121490 |
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Remote Sensing |
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Rapid urbanization has generated enormous pressure on natural resources. This study illustrates urban expansion in the Jing-Jin-Ji region and its influence on vegetation primary productivity. Tempo-spatial correlations between a vegetation index and nighttime light intensity are discussed to assess the urbanization effect quantitatively. The results show that: (1) From 1998 to 2018, urban areas gradually expanded outward from their original conglomerations. (2) In the past 20 years, Beijing and Tianjin have developed in different ways. The surrounding satellite cities have mostly developed concentrically, although some cities in Hebei province have developed more linearly. (3) The average primary productivity of the study area in 1998, 2003, 2008, 2013, and 2018 was generally lower than that of non-urban regions of the same year. (4) During the period from 1998 to 2018, the primary productivity of vegetation in the urban built-up areas increased, and the condition of the plant improved. |
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0959-6526 |
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GFZ @ kyba @ |
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2925 |
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Kate, N.N.; Chandrasekhar, M.; Kondam, A.; Kayalvizhi, E.; Suresh, M.; Kavitha, U. |
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A study on effect of altered circadian rhythm in the development of obesity |
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Journal Article |
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2012 |
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Int J Biol Med Res |
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3 |
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2 |
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1595 – 1601 |
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Animals |
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Background: Most living things have a daily cycle that reflects the rising and setting of the sun. A variety of studies have demonstrated that retinal light exposure can increase alertness at night. The global increase in the prevalence of obesity and metabolic disorders coincides with the increase of exposure to light at night (LAN) and shift work. The circadian clock prepares individuals for predictable events such as food availability and sleep, and disruption of clock function causes circadian and metabolic disturbances. Aim: To determine whether a causal relationship exists between night time light exposure behavioral changes and obesity. Methods: In this experiment 18 Swiss–albino male mice were divided into three groups i.e. Continuous light exposure (CL), light at night (LAN), standard (LD) light/dark cycle (control) and the effect of altered circadian rhythm on development of obesity and behavioral changes is seen. The body mass was assessed at the end of eight weeks to find out whether there was any correlation between the three variants. Results: Mice housed in continuous light (CL) or LAN have significantly increased body mass and increased prevalence of day time eating and altered behavioral pattern than mice in a standard (LD) light/dark cycle. Conclusion: These results suggest that light at night disrupt the timing of food intake and other metabolic signals, leading to excess weight gain. Melatonin is vital to this process, mediating the seasonal photoperiodic information through the clock system. Disrupting the melatonin signal or increasing the duration of light leads to changes in metabolism and adiposity consistent with fat storage and insulin resistance. These data are relevant to the coincidence between increasing use of light at night and obesity in humans (night shift worker). |
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LoNNe @ christopher.kyba @ |
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390 |
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Ho, C.Y.; Lin, H.T.; Huang, K.Y. |
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A Study on Energy Saving and Light Pollution of LED Advertising Signs |
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2011 |
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Applied Mechanics and Materials |
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Amm |
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121-126 |
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2979-2984 |
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Advertising Sign; LED; Light Trespass; Luminance Limit; Saving Energy; Vertical Illuminance; *Lighting |
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Lighting advertising signs not only play an important role in outdoor lighting environment in Taiwan, but also become the main factor of energy consumption in urban areas at night. Light-emitting diode (LED) has been gradually used in advertising signs due to its advantages. However, in order to be conspicuous and legible in the daytime, signs that are excessively bright may result in considerable light pollution and energy waste at nighttime. Therefore, this research aims to measure the luminance of LED signs and traditional internally lighted signs, and analyze the light trespass from each signage. Based on the research results, the energy consumption from a LED full color screen is 12 times more than a traditional internally lighted sign per day. Statistically, all kinds of LED signs are much higher than traditional internally lighted signs in the percentage of excessive brightness and average luminance value. As for the light trespass, since the vertical illuminance on facade facing the signs increases with the increase of the sign area or the decrease of the distance between the sign and the facade, the vertical illuminance on facade facing the signs would exceed the limit of CIE even if the luminance of the signs achieves the standard of CIE in terms of the general conditions in Taiwan. This happens to LED full color screens in particular and thus results in considerable obtrusive light. To sum up, in order to reduce unnecessary energy consumption and improve the nighttime lighting quality for outdoor environment, this research recommends the luminance limitation for light dimming of LED advertising signs should refer to the zoning, time period, and sign area. |
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1662-7482 |
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IDA @ john @ |
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126 |
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Cui, Y.; Zhao, J.Y.; Chu, J.K.; Guan, L.; Zhang, R. |
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A Study on Polarization Pattern of Full Moonlight Based on the Neutral Points and the Meridian |
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2017 |
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Applied Mechanics and Materials |
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Amm |
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868 |
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350-356 |
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moonlight |
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1662-7482 |
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LoNNe @ kyba @ |
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1694 |
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Park, H.-K.; Gu, J.-H.; Lee, K.-M. |
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A study on selecting of Light Cutoff Panel depending on the installation condition using the lighting simulation |
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Journal Article |
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2016 |
Publication |
Journal of the Korea Academia-Industrial cooperation Society |
Abbreviated Journal |
Journal of the Korea Academia-Industrial cooperation Society |
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17 |
Issue |
2 |
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246-251 |
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Lighting; Light cutoff panel; Light pollution; Light trespass; Relux; Security light |
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The use of security lighting that emits spill light is considered a cause of light trespass problems in the residential areas. Therefore, a cutoff panel was installed as an alternative way to reduce light trespass. On the other hand, it has another problem in that it is less effective and is not good enough for aesthetics and safety. In this study, a light cutoff panel was designed and manufactured to reduce the light trespass, and the structure of a proper light cutoff panel was studied. Using a goniophotometer, the light distribution file (IES file) was extracted and the characteristics of light distribution were analyzed using the RELUX program. The results showed that the reduction of spilt light in the backward direction was decreased significantly for all types of light cutoff panels except the coated globe. In the case of a black powder coated light cutoff panel, the forward light caused by light reflected from the surface of the light cutoff panel was also reduced, which means that the black powder coated light cutoff panel is effective in the performance of light cutoff in the forward and backward directions. In addition, the coated glove increased the spilt light in the forward and backward directions because it reflects the upward light to go down. A 90 % accuracy between the measurement value of light trespass and the expected value of the light trespass was obtained from a simulation. |
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National Institute of Environmental Research; mossad61(at)korea.kr |
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KoreaScience |
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Korean |
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1975-4701 |
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IDA @ john @ |
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1448 |
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