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 50 for “"LED-light"”.
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Use of SIMO Converstion for Optimizing LED Light Drivers
… tremendous cost pressures are pushing the LED lighting market away from traditional power electronics converters and towards solutions that are more unconventional. Lower quality LED lights use simple low-cost converters, whereas high end product may add complexity in order to achieve a …
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The effects of LED light flicker on turkey hen production, health, and welfare to 11 weeks of age
This study examined the impacts of light-emitting-diode flicker on Nicholas Select turkey hens (n=3267) to 11 weeks (wk) of age. There were three treatments: the 30 Hertz (Hz) treatment (30HZ) the 90 Hz treatment (90HZ) and the 195 Hz treatment (195HZ). Birds were randomly assigned to nine …
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Controlling Light-Induced Flavors in 2% Milk
… commercial retail cases from fluorescent to light emitting-diode lights (LED), however the effect of LED light on milk quality (flavor and nutritional content) has not been thoroughly studied. Packaging efficacy of light protecting additives (LPA) in high-density polyethylene (HDPE) was …
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Influence of light conditions on the dynamics of Tetranychus urticae and its control by the predatory mite Neoseiulus californicus
The increasing adoption of LED technology in agriculture raises important ecological questions regarding its impact on pest and natural enemy dynamics. This study investigates the impact of LED light exposure on the dynamics of the two-spotted spider mite (Tetranychus urticae) and its control by …
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Die Wirkung verschiedener LED-Geräte auf die Durchhärtungstiefe und die Vickers-Härte verschiedener Composite
Dental light-curing composites have been cured successful with halogen and plasma-light long time ago. Since now the technologie of LED-light is allready used for polymerization of composites. The aim of this paper was to inquire the influence of LED-Light on the curing depth and the Vickers …
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Oxidation barrier and light protective packaging properties for controlling light induced oxidation in milk
Fluorescent light exposure has well documented negative effects on fluid milk through oxidation reactions. A shift to light-emitting diode (LED) lights in retail dairy cases has occurred due to increased energy efficiency, but the effects of LED light on fluid milk are not known. The objective was …
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The Effect of Jungle Light Spectrum on the Fearfulness of Commercial Broiler Chickens
… lit. There is discussion about high intensity light (50 lux), natural light from windows compared to conventional dim lighting programs (2 – 5 lux) using “white” LED light. Chickens are prey animals that depend on their vision safety. Chickens “see” the word differently than humans and other …
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Effects of artificial light at night on benthic primary producers in freshwaters
… 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 natural light regime by artificial light at night (ALAN) is contributing to …
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Intentional and Unintentional Light Emission Diode in Power Electronics applications
The phenomenon of light emission in a P-N junction is due to the recombination of electrons and holes in the junction. This light emission phenomenon has been widely used in power electronics applications. Among them, it is worth remembering the use of the light-emitting diode (LED) as a source of …
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A stimulus/recording system for optogenetics: circuit, firmware, and software design and implementation
An efficient and precise stimulus light delivery and signal readout system is the crucial component in studying optogenetics in a living animal model. In this study, a lightweight, low-cost stimulus/readout system is proposed, designed, fabricated, and tested for optogenetics study of neural …
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The effect of device position and use of transparent covers on the irradiance distribution of LED phototherapy devices
… Irradiance increases as the distance of the light source decreases from a single phototherapy light. There are limited studies of the effect of distance and positional changes on different LED light designs on achieving effective phototherapy. Objectives To describe and compare the effect of …
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An Investigation into full color Edge-lit Holographic Optical Elements
… recording geometries. The results have been coupled with newly emerging LED (light emitting diode) illumination to identify application to novel energy efficient lighting unit designs.
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Design, fabrication and characterization of terahertz quantum-well photodetectors
… for THz imaging. In addition, a THz QWP-LED (Light-Emitting Diode) can upconvert the THz to NIR radiation and useful for THz imaging in Focal-Plane Array (FPA). In this thesis project, the theory of the intersubband transition and carrier transport in a THz QWP is studied. The designe, …
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Impact of growth stage, supplemental red LED, and salinity stress on the quality and aroma attributes of hydroponic fennel (Foeniculum vulgare Mill.)
… of fennel. In particular, supplemental red light and salinity are known to modulate the production of aroma compounds in herbs, but the molecular mechanisms underlying these effects remain largely unexplored. Controlled environment agriculture (CEA) provides an ideal platform for studying …
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Motion artifact cancellation for wearable photoplethysmographic sensor
… skin, by exposing a section of the skin to an LED light and measuring the changes in reflected light due to the blood pulsing through under the skin. However, PPG signals are highly susceptible to motion artifacts, and in order for this technique to be useful for heart rate measurements …
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Composite cure and post-gel shrinkage with different halogen and LED curing lights
… to determine the curing efficiency of different LED (light-emitting diodes) and halogen curing lights through various selected properties such as the thermal emission, effectiveness of cure, depth of cure, polymerization shrinkage and degree of conversion. Ten different light curing regimens …
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Irradiance source for exoplanet atmospheric spectra
… irradiation source consisting of an interface of LED light channels with differing chromatic emissions controlled by software that allows for the tuning of each LED channel to match a variety of spectral outputs. This paper will demonstrate the progress made on the design and preliminary data that …
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A cost effective solar powered led street light
A cost effective solar powered LED street light was designed based on the current solar powered street light installed at Masjid Nurul Huda, Kampung Gentisan, Sepanggar, Sabah, Malaysia. A new load profile is obtained based on a thirty day data collection at site utilizing motion sensor to record …
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Influencia de luces led en el perfil fitoquímico de brotes de crucíferas: estudio de bioaccesibilidad
… sentido, la aplicación de elicitores como la luz LED permite mejorar la acumulación de estos compuestos, por medio de la inducción de un estrés agudo en la planta. Sin embargo, la actividad biológica asociada a un compuesto fitoquímico no es una garantía de un efecto sobre la salud cuando …
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Experimental investigation of a catalyst under various solar light conditions for hydrogen production.
The light absorption characteristics of the photocatalyst {[Ru(bpy)2(dpp)]2RhBr2}5+ and the photochemical Ru(bpy)2(dpp)2+ is investigated. Extinction coefficient versus wavelength is determined for both a low intensity broad spectrum LED light source and one sun intensity simulated sunlight. …
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