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 29 for “"Dimming"”.
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Design and implementation of A truecolor wide dimming single-pin LED driver
This thesis develops a single-pin LED driver used in wide screen displays. With the increasing size of the displays, a more compact multi-channel driver solution is needed for the increasing number of back light LEDs. This thesis focuses on the pin count and the accuracy. Simulation results and …
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A Descriptive Catalog of Dimming Cells in the Purple Shore Crab HEMIGRAPSUS NUDUS
… of cells responsive to the decrease or dimming of light was identified in the Purple shore crab <em>Hemigrapsus nudus</em>. Extracellular pin electrode recordings from the optic nerve tract measured responses to decremental changes in relative light levels over the range 40 to 0.08 lux. …
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Analysis and development of improved convertes for LED drivers with special focus on efficiency and dimming
Light-emitting-diodes (LED) were first developed in 1960s. Nowadays, they have become one of the most popular lighting sources in a wide variety of applications. This is owing to the following advantages shown by LEDs: longer lifetime, higher efficacy, smaller size, fast response, robustness, …
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Optical studies of colloidal quantum dots : optical trapping with plasmonic nanoapertures and thermal recovery from photoinduced dimming
… energy to drive recovery from photoinduced dimming in QD ensembles. Nonlinear thermal recovery was well described by a stretched exponential function, and further analysis yielded an underlying probability distribution of rate constants. Casting the rate constants as a collection of …
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A methodology for detailed calculation of illuminance levels and light dimming factors in a room with motorized blinds integrated in an advanced window
… level on the work plane is computed and light dimming levels are established. (4) Energy savings from reduced utilisation of electric lights are estimated
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Advanced High-Frequency Electronic Ballasting Techniques for Gas Discharge Lamps
… PFC electronic ballasts with wide range dimming controls, single-stage charge-pump PFC electronic ballasts with lamp voltage feedback, and self-oscillating single-stage PFC electronic ballasts. Single-stage boost-derived PFC electronic ballasts with voltage-divider-rectifier front ends …
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Spectral analysis of integrated F-center feedback dosimeter
… with a lone electron. These vacancies cause dimming bands in broad-band illumination of the crystal, and the vacancies increase in number in a proportional fashion to the dose received. The experiment proposed here will serve both to measure the dimming quality of various alkali halide salts …
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Spectroscopic and spectro-astrometric analysis of T Tauri Stars
… During that time frame, AA Tau went through a dimming event, the effects of which we analyzed and used to discuss the implications for the source of the dimming event."--Abstract, page iii.
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The Impact of Textual Display Strategies on Learning from Electronic Presentations
… include the use of progressive disclosure, dimming, and highlighting of text instead of full disclosure of text. Through the development and use of four separate electronic presentations, each of which was designed to employ one of these specific strategies (full disclosure, progressive …
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Avalanches in stars and at finite temperature
… of time, to extract avalanche information. Dimming events on the Sun are fairly well understood, and we find that there is scaling even in the Sun's data, likely caused by sunspots or combinations of such spots. We also look at Tabby's star, where the anomalous dimming has not been …
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A High efficiency high power led driver with fault tolerance and multiple led load driving using a coupled Cuk converter
… drivers are also reviewed. Several dimming methods and their effects on the LED efficacy and lifetime are investigated. As a result, a converter with coupled inductors, suitable as an LED driver which has high efficiency and can maintain high LED efficacy, incorporated with a high …
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Park Bench in My Head
… awareness, and the consequences of amplifying or dimming our lights.
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Adaptive Automotive Lighting Systems
… involving adaptive lighting or simple dimming features. This thesis shows implementation of various non-isolated analog converters integrated with digital dimmers to achieve these adaptive lighting systems. Adaptive lighting systems involve reading an input from an external source …
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Lumental : web-based tunable lighting control
… energy savings over binary or incremental dimming control. To enable this level of controllability, lighting must evolve from traditional physical interfaces towards autonomous systems that rely on behavior recognition. Lumental is a system design proposal and preliminary implementation of …
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Off-line supply of solid-state lamps : Lamp modelling, application of the integrated buckflyback converter and proposal of a new optimised scheme
… última es su capacidad de regulación de luz, o dimming, que resulta altamente interesante para adecuar los niveles de iluminación a las necesidades precisas, con el consiguiente ahorro energético. Desafortunadamente, la iluminación LED no está exenta de retos. Entre ellos se encuentra la …
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Second Generation Tactile Imaging System for Mechanical Properties Estimation
… driver and a Pulse Width Modulation (PWM) dimming to stabilize the light brightness. After confirming the ability to obtain clearer images of the target, we compared the newly revamped TIS with the older version. The results showed that the images are clearer with a 214% larger …
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Low coronal signatures of coronal mass ejections: coronal “waves” and dimmings
… signatures of CMEs, namely coronal waves and dimmings, are studied. A comprehensive list of observational properties of EIT coronal waves is compiled and potential counterparts in radio, H!, soft X-rays and He II wavelengths are also discussed. New observational constraints on EIT coronal …
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The Italian venture capital market, or the lack thereof : an analysis in the European context
… the country's success, gradually faded off, like dimming lights after a theatre play. This work aims to investigate the industry of venture capital in Italy because of its key role in supporting innovation. Through innovation and enhanced productivity, I believe, the country can escape its spiral …
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Effects of Emergency Vehicle Warning Lighting System Characteristics on Driver Perception and Behavior
… more visible. This finding may suggest that dimming emergency lights at night could results in near equal visibility, but with significantly less glare. The rated visibility of the lights appears to be related to the perceived saturation of the color, while discomfort glare is related to the …
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Aportaciones al modelado de lámparas fluorescentes para aplicaciones en alta frecuencia con regulación de flujo luminoso
… de las lámparas cuando estas trabajan en modo dimming y que establece la manera más idónea de incluir a los electrodos en el circuito equivalente de la lámpara. Finalmente se introduce el método de cálculo de las líneas SoS. En el Capítulo 3 se describe la caracterización en pequeña señal de …
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