Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 55 for “"artificial light"”.
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Fluid atmospheres : adaptive interplay between natural and artificial light projection
… at the same time? Given extra layers of "light" a compose-able architecture is yet to come. A building is a living, breathing space that is ever moving and rapidly morphing - its animus is time. Take a closer look at the surfaces that enclose our space: there are screens with news, …
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Effects of Artificial Light at Night on Zebra Finch Nocturnal Behavior
… population living in urban areas every year, artificial light is becoming an increasingly pervasive pollutant worldwide. It is important to study the potential effects of artificial light at night (ALAN) exposure, particularly on diurnal vertebrates. Previous studies have shown that ALAN …
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DNA Origami Structures for Artificial Light-Harvesting and Optical Voltage Sensing
… we apply DNA nanotechnology for developing novel light-harvesting and optical voltage sensing nano-devices. We use the programmable positioning of dye molecules on a DNA origami plate as a mimic of a light-harvesting antenna complex required for photosynthesis. Such a structure allows us to …
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Effects of artificial light at night on benthic primary producers in freshwaters
In recent decades, the use of artificial nocturnal illumination has rapidly increased worldwide, imposing an increase of nocturnal light levels and a disruption of natural cycles of light and dark that have been stable over geological and evolutionary time scales. This wide-spread alteration of the …
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Triplet Excitons in Natural Photosynthetic and Artificial Light Harvesting Systems: Measurement and Modeling.
Under full sunlight, unprotected (Bacterio)Chlorophyll ((B)Chl) molecules photodegrade in a matter of minutes. This is the result of the generation of highly reactive singlet oxygen (1O2) by energy transfer from the (B)Chl triplet state (3(B)Chl) to the oxygen ground state. Natural photosynthetic …
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Artificial Light at Night Alters Physiology, Behavior, and Reproduction in the Western Mosquitofish (Gambusia affinis)
… to the rapid decrease of biodiversity worldwide. Artificial light at night (ALAN) is an anthropogenic pollutant that is increasing with the spread of urbanization and may contribute to biodiversity declines. ALAN alters the migration patterns of birds, communication in frogs, and impacts …
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BASIC AND APPLIED RESEARCH APPROACHES FOR OPTIMIZING THE USE OF ARTIFICIAL LIGHT IN VEGETABLE CROPS
Light-emitting diode (LED) lights are a desirable alternative to outdated lighting systems due to their numerous benefits, including programmability and efficiency in energy consumption. But before switching from traditional broad-waveband lighting systems to narrow-wavelength LED lighting, there …
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Ultrafast linear and non-linear spectroscopy : from biological light-receptors to artificial light-harvesting systems
… functiondynamics relationship in biological and artificially designed systems. The experiments presented in this work utilize femtosecond time-resolved transient absorption and transient grating as well as picosecond time-resolved fluorescence spectroscopy to investigate the photophysics and …
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Illuminating the path of darkness: social and sacred power of artificial light in Pharaonic Period Egypt
Light is seldom addressed in archaeological research, despite the fact that, at least in ancient Egypt, it would have impacted upon all aspects of life. When discussing light in Egyptology, the vast majority of scholarly attention is placed on the sun, the primary source of illumination. In …
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Effects of Anthropogenic Light and Noise on Anuran Breeding Behavior
… of human activities, including the production of artificial light at night and anthropogenic noise. Recent studies suggest that pollution from anthropogenic light and noise alters animal behavior. Despite being highly nocturnal and vocal animals, little attention has been given to anurans and the …
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After Dark: Reading Canadian Literature in a Light-Polluted Age
… to nocturnal ecosystems and human health alike, light pollution is an unnecessary problem that comes at an enormous cost. The International Dark-Sky Association has recently estimated that the energy expended on light scatter alone is responsible for no less than twelve million tons of carbon …
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Specific light in sculpture
Specific light is defined as light from artificial or altered natural sources. The use and manipulation of light in three dimensional sculptural work is discussed in an historic and contemporary context. The author's work with metal arc light sources is presented and documented with developmental …
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Förster resonance energy transfer (FRET)-based nanophotonics using DNA origami structures
… wires and logic gates for molecular computing to artificial light harvesting systems for artificial photosynthesis. In the present cumulative doctoral thesis, different FRET systems on DNA origami structures have been designed and thoroughly analyzed. Firstly, the formation of guanine (G) …
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Green Photochemistry: The synthesis of fine chemicals with sunlight
… solar irradiation was demonstrated in Irish sunlight conditions at Dublin City University. Use of concentrated sunlight was investigated in collaboration with the German Aerospace Centre (DLR), Cologne. In all cases, solar irradiation gave yields greater than those obtained under artificial …
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Effect of light on the circadian activity rhythm of the slow loris, Nycticebus coucang
… was monitored under an experimentally varied light regime. During the process of reversing their day-night cycle, activity was monitored for a light-dark cycle roughly correlating to the external day-night, a free-running period in total darkness followed by a reversed day- night light …
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Optoelectronic properties and energy transport processes in cylindrical J-aggregates
The light harvesting systems of photosynthetic organisms harness solar energy by efficient light capture and subsequent transport of the light’s energy to a chemical reaction center. Man-made optical devices could benefit by mimicking these naturally occurring light harvesting processes. …
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Vliv světelného znečištění na noční motýly (Lepidoptera)
Light pollution, caused by the increasing presence of artificial lighting in nighttime environments, is emerging as a significant ecological stressor. This bachelor thesis focuses on the effects of artificial light at night (ALAN) on moths (Lepidoptera), a taxonomically and ecologically important …
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Flexibility in extended phenotype sexual signals in great bowerbirds, Chlamydera nuchalis
… by another source of anthropogenic pollution (artificial light at night) and explored whether males altered their display behaviour in response. Artificial light altered the light environment at the bower during the night, dawn, and dusk, but males did not increase their display activity at the …
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Daylighting applications of micro-textured optical surfaces
Daylighting is the use of natural light to replace artificial light. In traditional rooms sunlight will only illuminate the area closest to the window due to the high solar angle. The rear of the room appears gloomy and occupants will use electric lighting even though there is sufficient daylight …
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DETERMINATION OF STANDARD AND FIELD METABOLIC RATES IN TWO GREAT LAKES INVADING FISH SPECIES: ROUND GOBY (NEOGOBIUS MELANOSTOMUS) AND TUBENOSE GOBY (PROTERORHINUS SEMILUNARIS)
… cover, precipitation, ambient temperature, and artificial light exposure in a community of north temperate birds. I found that birds begin their dawn choruses significantly earlier with increasing moon brightness and ambient temperature, and significantly later with presence of cloud cover and …
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