| Records |
Author  |
Agbo David, O., Madukwe Chinaza, A., & Anyalewechi Chika, J. |
| Title |
Development of Solar Power Intelligent Street Lights System |
Type |
Journal Article |
| Year |
2019 |
Publication |
International Journal of Scientific and Research Publications |
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| Volume |
9 |
Issue |
6 |
Pages |
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| Keywords |
Lighting; Energy |
| Abstract |
The lack of natural light during night time in the urban environment has always been a problem. From people not being able to see where they are going, to the greater chance of being attacked or mugged at night which as we all know is a problem that has been in existence since humans started living together. The main advantage of this system exists in the reduction of costs related to energy consumption by the street light by integrating a vehicle/human detection algorithm into the system. The introduction of this vehicle/human detection algorithm further reduces the power consumption costs. In this project, solar PV is used to supply the energy to charge the battery. The battery later powers the operation of the whole system. The 12- 17V of the solar is buck to a steady 12V for battery charging. A light sensor is connected to the microcontroller that sense the light during day time, when the presence of day light is sensed the microcontroller turns ON the mosfet of the buck converter. If the voltage of the solar PV is greater than 12V, it charges the battery and switches off the load transistor. But at dawn, when the solar PV voltage is less than 12V the microcontroller turn OFF the buck converter mosfet and switch ON the load transistor. When no vehicle or human is detected for 10mins the microcontroller dims the LED lamp. If vehicle or human is detected the microcontroller brighten the LED lamp and inform the next microcontroller to brighten its LED lamp. If the next street light did not detect a vehicle or human after 10 mins it dims the lamp but if it detects a vehicle or human the lamp remain brightened. The microcontroller uses the ultrasonic sensor to detect object and the PIR sensor to detect human. The RF module is used for communication between the microcontrollers to inform each other the presence of vehicle or human. |
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IDA @ intern @ |
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2971 |
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| Author |
Agnew, J.; Gillespie, T.W.; Gonzalez, J.; Min, B. |
| Title |
Baghdad Nights: Evaluating the US Military ‘Surge’ Using Nighttime Light Signatures |
Type |
Journal Article |
| Year |
2008 |
Publication |
Environment and Planning A |
Abbreviated Journal |
Environ Plan A |
| Volume |
40 |
Issue |
10 |
Pages |
2285-2295 |
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Remote Sensing; Commentary |
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0308-518X |
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GFZ @ kyba @ |
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2028 |
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| Author |
Ahmed M. A. |
| Title |
Avoiding room light during night may stimulate immunity in COVID-19 patients by promoting melatonin production |
Type |
Journal Article |
| Year |
2020 |
Publication |
Melatonin Research |
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3 |
Issue |
4 |
Pages |
476-481 |
| Keywords |
Human Health; Commentary |
| Abstract |
COVID-19 is one of the greatest health issues facing humankind for many decades; it emerged in Wuhan, China, late in December 2019, and rapidly spread over the world within the short period. This report emphasizes the potential hazards of exposure to room light at night which affects the immunity of COVID-19 patients by suppressing their melatonin, which is only released from the pineal gland at night. Exposure to light at night is especially common in the hospital setting. This may make the symptom worse for the hospitalized patients and the light at night should not be ignored. Thus, I suggest that COVID-19 patients should avoid light at night either by wearing eye masks or darkening the room to enhance pineal melatonin synthesis and increase their serum melatonin levels. |
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UP @ altintas1 @ |
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3204 |
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Alaasam, V.J.; Duncan, R.; Casagrande, S.; Davies, S.; Sidher, A.; Seymoure, B.; Shen, Y.; Zhang, Y.; Ouyang, J.Q. |
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Light at night disrupts nocturnal rest and elevates glucocorticoids at cool color temperatures |
Type |
Journal Article |
| Year |
2018 |
Publication |
Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology |
Abbreviated Journal |
J Exp Zool A Ecol Integr Physiol |
| Volume |
329 |
Issue |
8-9 |
Pages |
465-472 |
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Animals |
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Nighttime light pollution is quickly becoming a pervasive, global concern. Since the invention and proliferation of light-emitting diodes (LED), it has become common for consumers to select from a range of color temperatures of light with varying spectra. Yet, the biological impacts of these different spectra on organisms remain unclear. We tested if nighttime illumination of LEDs, at two commercially available color temperatures (3000 and 5000 K) and at ecologically relevant illumination levels affected body condition, food intake, locomotor activity, and glucocorticoid levels in zebra finches (Taeniopygia guttata). We found that individuals exposed to 5000 K light had higher rates of nighttime activity (peaking after 1 week of treatment) compared to 3000 K light and controls (no nighttime light). Birds in the 5000 K treatment group also had increased corticosterone levels from pretreatment levels compared to 3000 K and control groups but no changes in body condition or food intake. Individuals that were active during the night did not consequently decrease daytime activity. This study adds to the growing evidence that the spectrum of artificial light at night is important, and we advocate the use of nighttime lighting with warmer color temperatures of 3000 K instead of 5000 K to decrease energetic costs for avian taxa. |
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Department of Biology, University of Nevada, Reno, Nevada |
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English |
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2471-5638 |
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PMID:29766666 |
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GFZ @ kyba @ |
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1909 |
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Alaimo, A.; Linares, G.G.; Bujjamer, J.M.; Gorojod, R.M.; Alcon, S.P.; Martinez, J.H.; Baldessari, A.; Grecco, H.E.; Kotler, M.L. |
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Toxicity of blue led light and A2E is associated to mitochondrial dynamics impairment in ARPE-19 cells: implications for age-related macular degeneration |
Type |
Journal Article |
| Year |
2019 |
Publication |
Archives of Toxicology |
Abbreviated Journal |
Arch Toxicol |
| Volume |
93 |
Issue |
5 |
Pages |
1401-1415 |
| Keywords |
Vision; age-related macular degeneration; Eye; Eye Diseases; blue light |
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Age-related macular degeneration (AMD) is a multifactorial retinal disease characterized by a progressive loss of central vision. Retinal pigment epithelium (RPE) degeneration is a critical event in AMD. It has been associated to A2E accumulation, which sensitizes RPE to blue light photodamage. Mitochondrial quality control mechanisms have evolved to ensure mitochondrial integrity and preserve cellular homeostasis. Particularly, mitochondrial dynamics involve the regulation of mitochondrial fission and fusion to preserve a healthy mitochondrial network. The present study aims to clarify the cellular and molecular mechanisms underlying photodamage-induced RPE cell death with particular focus on the involvement of defective mitochondrial dynamics. Light-emitting diodes irradiation (445 +/- 18 nm; 4.43 mW/cm(2)) significantly reduced the viability of both unloaded and A2E-loaded human ARPE-19 cells and increased reactive oxygen species production. A2E along with blue light, triggered apoptosis measured by MC540/PI-flow cytometry and activated caspase-3. Blue light induced mitochondrial fusion/fission imbalance towards mitochondrial fragmentation in both non-loaded and A2E-loaded cells which correlated with the deregulation of mitochondria-shaping proteins level (OPA1, DRP1 and OMA1). To our knowledge, this is the first work reporting that photodamage causes mitochondrial dynamics deregulation in RPE cells. This process could possibly contribute to AMD pathology. Our findings suggest that the regulation of mitochondrial dynamics may be a valuable strategy for treating retinal degeneration diseases, such as AMD. |
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Departamento de Quimica Biologica, Facultad de Ciencias Exactas y Naturales, Instituto de Quimica Biologica Ciencias Exactas y Naturales (IQUIBICEN), CONICET-Universidad de Buenos Aires, Pabellon 2, Ciudad Universitaria, 1428, Buenos Aires, Argentina. kotler@qb.fcen.uba.ar |
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English |
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0340-5761 |
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PMID:30778631 |
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GFZ @ kyba @ |
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2229 |
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