The main purpose of this research project was to implement a combination of computer graphics and processing to generate displays that will aid in the visualization of the colour rendering properties of a range of light sources, including the new generation of high-output LEDs (light emitting diodes) that are becoming widely adopted in general lighting service. The CIE (International Commission on Illumination) has developed a colour appearance model CIECAM02 for use in colour imaging and colour management, and this model is utilized in this work. This thesis describes the design and construction of a computer-based model that can be used as a research tool for the simulation and demonstration of the colour rendering properties of various artificial light sources. It is a comprehensive study of the colour models and measurement procedures currently in use in the lighting industry, as recommended by the CIE. This research project focused on the display of a set of surface colour patches as if they were illuminated by a specific light source, and the simultaneous display of two such sets to demonstrate the surface colour differences arising from the use of the two different light sources. A VIS (virtual imaging system) has been developed to display the colour properties of a series of test colour samples under different light sources. This thesis describes the computer models developed for the representation and display of surface colours in general, and colour rendering in particular. The designed system computes and displays the colour of each sample from a knowledge of the light-source spectrum and the spectral reflectance of each surface. It can simultaneously display the colours resulting from illumination by two different sources. In addition, the system computes the colour appearance differences for two sets of colours using the CIECAM02 colour appearance model. Subjective and objective tests were taken to validate the computed results. The VIS has been designed and implemented. It also has been tested by 21 observers and we believe that it will be a powerful research tool for the lighting industry, especially in relation to colour rendering.

No description available.

The aim of the thesis is to design a series of lighting. The thesis includes a brief history of the lighting production, revises possibilities of power systems used for lighting, and describes their parameters as well as usability. It covers information about types of lights and their features; mentions also current trends in the industry. The most important rules for the lighting systems, which should be kept to create appropriate living environment, are specifically described in the thesis. The practical part covers the process of designing and designer's work flow. The outcome of whole study are 3 original lights designed by the author. The practical part also includes competition overview; sketches; drafts of material and construction solutions; visualisation and prototype production.

Submitted by Suelen Reis (suziy.ellen@gmail.com) on 2013-04-23T13:47:41Z No. of bitstreams: 1 Tese - Ana Paula Cavalcanti.pdf: 9447670 bytes, checksum: 44f05935b4d040bdf7dacb56067b1fe3 (MD5) / Approved for entry into archive by Rodrigo Meirelles(rodrigomei@ufba.br) on 2013-05-08T11:47:47Z (GMT) No. of bitstreams: 1 Tese - Ana Paula Cavalcanti.pdf: 9447670 bytes, checksum: 44f05935b4d040bdf7dacb56067b1fe3 (MD5) / Made available in DSpace on 2013-05-08T11:47:47Z (GMT). No. of bitstreams: 1 Tese - Ana Paula Cavalcanti.pdf: 9447670 bytes, checksum: 44f05935b4d040bdf7dacb56067b1fe3 (MD5) Previous issue date: 2008 / O objetivo do presente estudo foi avaliar histologicamente o reparo de feridas cutâneas em dorso de ratos submetidos ao tratamento com Laser e/ou LED, utilizando laser de diodo GaAlAs nos comprimentos de onda de λ660nm e λ790nm e LEDs em três comprimentos de onda. Foram utilizados 44 ratos da linhagem Wistar adultos jovens, machos, pesando entre 200 e 250 gramas. Após a realização de uma ferida excisional no dorso, os animais foram distribuídos aleatoriamente em onze grupos de estudo, com quatro animais cada: G0- Controle; G1- Laser λ660nm, 10J/cm2; G2- Laser λ790nm, 10J/cm2; G3- LED ~λ700nm, 15mW, 10J/cm2; G4- Laser λ660nm + LED ~λ700nm, 10J/cm2; G5- LED ~λ700nm, 16mW, 10J/cm2; G6- Laser λ790nm + LED ~λ700nm, 10J/cm2; G7- LED ~λ530nm, 10J/cm2; G7- Laser λ790nm + LED ~λ530nm, 10J/cm2; G8 - LED ~λ460nm, 10J/cm2; G10- Laser λ790nm + LED ~λ460nm, 10J/cm2. As irradiações foram realizadas durante sete dias com intervalos de 48 horas, e a morte animal ocorreu no oitavo dia. As peças foram removidas, processadas histologicamente e coradas com HE e Picrosírius, e analisadas por microscopia óptica. Os resultados indicam que as radiações laser λ790nm, LED vermelha (~λ700nm)(15mW) e as associações LED vermelho com laser λ790nm e LED verde com laser λ790nm apresentaram biomodulação positiva sobre a quantidade de fibroblastos e de fibras colágenas. A associação LED verde com laser λ790nm, dentre todos os tratamentos, resultou na deposição de colágeno mais significante e as radiações LED vermelha (15 e 16mW) e laser λ660nm exerceram o efeito de biomodulação positiva mais expressivo na proliferação de fibroblastos e na angiogênese. As radiações laser, LED e suas associações, dentro dos parâmetros especificados, exercem, de maneira geral, biomodulação positiva sobre a proliferação de fibroblastos, a formação de tecido de granulação, a deposição de fibras colágenas e a angiogênese. / Salvador

In December of 2016, the Theater Department at Southern Illinois University (SIU) presented a production of Beyond the Horizon by Eugene O’Neill. This play, the first full-length published by O’Neill, is the journey of the Mayo family as they deal with love, loss, and the persistent need to continue reaching for a dream. This thesis document will outline my struggles to create an idealistic horizon while keeping the main characters physically rooted to their farm. Chapter 1 details my analysis of the source material and includes reviews on symbols and connections between characters. Chapter 2 is a narrative on my experience during the design process, and Chapter 3 is a review of my work and a personal critique.

Ingeniero Civil Industrial / Renovo Chile Ingeniería Limitada es una empresa cuya actividad corresponde a la comercialización de aparatos de iluminación LED al por mayor y menor. Empresa fundada en 2011 por Jannik Haas y Javier Gavilán (alumno memorista), tuvo un rápido crecimiento de las ventas (72%) en sus primeros cinco meses de funcionamiento. Sin embargo, entro en declive desde mediados de 2012. Esto fue provocado por una serie de causas en las que destacan: reducción de canales de venta, menor compromiso de la administración, precios superiores a la competencia, incremento en la cantidad de competidores, incumplimiento en plazos de entrega, entre otros. Se propone un plan de negocios con el fin de generar las acciones que permitan levantar el negocio, conformando un equipo nuevo y explorando nuevos modelos de negocios, mediante la incorporación es las Energy Companies Services (ESCO) y sus modelos de ingresos en base al ahorro de consumo eléctrico generado en sus clientes. El tamaño de la oportunidad en Chile se estima en US$83,28 millones en 2014, compuesto por los segmentos residenciales y comerciales (empresas), alcanzando los casi US$200 millones para 2020. El resultado del plan de negocios fue calculado considerando un modelo tradicional de comercialización y otro que añade ventas por proyectos ESCO. Al comparar los indicadores, se obtiene que poseen rentabilidades similares, pero con diferencia de $200 millones de pesos al cabo de tres años de horizonte de planificación. Donde el proyecto sin ESCO generaría un valor de $180 millones y el modelo con ESCO, cercano a los $400 millones. La principal diferencia radica en la necesidad de mayor capital inicial y esfuerzos de venta para el modelo ESCO. Por otro lado, al comparar los potenciales escenarios desfavorables, el proyecto con ESCO destaca por mantener una rentabilidad promedio sobre 60%, cuando el plan de negocios tradicional de compra-venta de ampolletas puede alcanzar rentabilidades nulas. El proyecto con ESCO es atractivo de realizar si se logra conseguir financiamiento bancario para su ejecución y si el autor, que actuará de Gerente General de RenovoChile, puede armar un equipo de socios que estén dispuestos a sacrificar su costo de oportunidad por llevar a cabo la propuesta planteada en esta memoria.

No description available.

Sources of entangled pairs of photons can be used for encoding signals in quantum-encrypted communications, allowing a sender, Alice, and a receiver, Bob, to exchange keys without the possibility of eavesdropping. In fact, any quantum information system would require single and entangled photons to serve as qubits. For this purpose, semiconductor quantum dots (QD) have been extensively studied for their ability to produce entangled light and function as single photon sources. The quality of such sources is evaluated based on three criteria: high efficiency, small multi-photon probability, and quantum indistinguishability. In this work, a simple quantum dot-based LED (E-LED) was used as a quantum light source for on-demand emission, indicating the potential for use as quantum information devices. Limitations of the device include the fine-structure splitting of the quantum dot excitons, their coherence lengths and charge carrier interactions in the structure. The quantum dot-based light emitting diode was initially shown to operate in pulsed mode under AC bias frequencies of up to several hundreds of MHz, without compromising the quality of emission. In a Hong-ou-Mandel interference type experiment, the quantum dot photons were shown to interfere with dissimilar photons from a laser, achieving high two-photon interference (TPI) visibilities. Quantum entanglement from a QD photon pair was also measured in pulsed mode, where the QD-based entangled-LED (E-LED) was electrically injected at a frequency of 203 MHz. After verifying indistinguishability and good entanglement properties from the QD photons under the above conditions, a quantum relay over 1km of fibre was demonstrated, using input qubits from a laser source. The average relay fidelity was high enough to allow for error correction for this BB84-type scheme. To improve the properties of the QD emission, an E-LED was developed based on droplet epitaxy (D-E) QDs, using a different QD growth technique. The relevant chapter outlines the process of QD growth and finally demonstration of quantum entanglement from an electrically injected diode, yielding improvements compared to previous E-LED devices. For the same reason, an alternative method of E-LED operation based on resonant two-photon excitation of the QD was explored. Analysis of Rabi oscillations in a quantum dot with a bound exciton state demonstrated coupling of the ground state and the biexciton state by the external oscillating field of a laser, therefore allowing the transition between the two states. The results include a considerable improvement in the coherence length of the QD emission, which is crucial for future quantum network applications. We believe that extending this research can find application in quantum cryptography and in realising the interface of a quantum network, based on semiconductor nanotechnology.

abstract: Intelligence, consisting of critical products that facilitate law enforcement decision-making, is a crucial component and tool in the criminal justice system. However, the ways in which intelligence is gathered and used has gone largely unevaluated, particularly at the local level of law enforcement. This thesis begins to address the sparsity of literature by investigating the Intelligence Officer function in the Phoenix Police Department. More specifically, this study explores their roles; perceptions on information they are gathering, namely reliability and validity; and their effectiveness in terms of both intelligence and case successes. Different aspects of roles and perceptions are also examined in terms of their ability to predict these outcomes. Data reflect a 22-month sample of officer reports from the Phoenix Police Department Intelligence Officer Program. Descriptive analyses suggest that Intelligence Officers typically work specific cases with varied and different natures of crime. Generally, officers seem to be confident in the information they collect in terms of reliability and validity, and also appear to be relatively successful in achieving both broad intelligence successes and more tangible case successes. However, the relationships between role and perception variables and results vary in terms of both impact and significance for each type of success. Future research is required to better understand these relationships and to continue building a foundation of knowledge on Intelligence Officer effectiveness, so their impact can be optimized. / Dissertation/Thesis / Masters Thesis Criminology and Criminal Justice 2017

Made available in DSpace on 2014-06-11T19:24:07Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-06-29Bitstream added on 2014-06-13T20:31:06Z : No. of bitstreams: 1 mollica_fb_me_sjc.pdf: 859430 bytes, checksum: 9995882b109a407d775d587ef3cb2f1c (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Este estudo teve por objetivo avaliar a eficiência de polimerização de uma resina composta (RC) e a variação de temperatura na dentina bovina, empregando aparelhos de Diodo Emissor de Luz (LED) de alta intensidade em comparação a um aparelho de Quartzo-Halogênio-Tungstênio (QTH). Os aparelhos utilizados foram: Curing Light XL 3000 (3M, 600 mW/cm2), LED SmartLite PS (Dentsply, 950 mW/cm2) e LED Radii (SDI, 1400 mW/cm2) e a RC, a Esthet X (Dentsply). Para o teste de microdureza Vickers, foram confeccionados 84 corpos-de-prova (2 mm x 5 mm) em matriz de teflon bipartida, variando-se o tempo de exposição em 10, 20 e 40 s, sendo que o aparelho XL 3000 foi utilizado para o grupo controle apenas pelo tempo de 40 s. Após 24 h, realizou-se o teste de microdureza no topo e na base dos corpos-de-prova com carga de 50 g e duração de 15 s. Para a medida da variação de temperatura ocasionada pelos aparelhos, foram utilizadas 45 fatias de dentina bovina de 0,7 mm de espessura e termopar tipo T conectado a um sistema de aquisição de dados ADS 2000 IP (Lynx Tecnologia). As fatias foram divididas em três grupos, sendo a variação de temperatura medida em três etapas: 1) durante a fotopolimerização do adesivo (10 s); 2) durante a fotopolimerização da RC (40 s) e 3) após 24 h (40 s). Os valores de microdureza do topo e da base e os dados de temperatura foram submetidos ao teste ANOVA de medidas repetidas e aos testes de Tukey e Dunnet (p=5%). Os resultados revelaram diferença estatística significante de microdureza no topo e na base quando se utilizaram ambos os LEDs por 10 s em relação ao uso do XL 3000 por 40 s, não havendo diferenças estatísticas entre os grupos com os tempos de 20 s e 40 s. A utilização do LED Radii pelos tempos de 10 e 20 s não foi suficiente... / The aim of this study was to evaluate the efficiency of polymerization of a resin composite and the temperature variation in bovine dentine, using two curing units of Light Emitting Diode (LED) of high intensity in comparison to a Quartz-Halogen-Tungsten device (QTH). The light curing units used were: Curing Light XL 3000 (3M, 600 mW/cm2), LED SmartLite PS (Dentsply, 950 mW/cm2) and LED Radii (SDI, 1400 mW/cm2) and the resin composite, Esthet X (Dentsply). For the test of Vickers microhardness, 84 specimens (2 mm X 5 mm) were prepared in bipartite matrix of teflon, varying the time of exposition in 10, 20 and 40 s. The curing unit XL 3000 was used for the control group for 40 s. After 24 h, the microhardness test was made on the top and base of the specimens with 50 g of load and 15 s of duration. For the temperature variation measurement caused by the different curing units, 45 slices of bovine dentine of 0.7 mm thickness and a thermocouple type T hardwired to a system of data acquisition ADS 2000 IP (Lynx Technology) were used. The slices were divided in three groups and the temperature variation was measured in three stages: 1) during the adhesive photopolymerization (10 s); 2) during resin composite photopolymerization (40 s) and 3) after 24 h (40 s). The values of microhardness of the top and the base and the data of temperature variation were submitted to ANOVA of repeated measures test and to the tests of Tukey and Dunnet (p=5%). The results showed statistical significant difference of microhardness for the top and base values when both LEDs were used for 10 s in relation to the use of XL 3000 for 40 s, but no statistical differences were found between the groups when the exposition time was 20 s and 40 s. The use of LED Radii for 10 s and 20 s was not enough to equal statistically ... (Complete abstract, click electronic access below)