No description available.

Examination of a more economical electrical method of reducing the number of micro-organisms on dairy utensils. / Master of Science

No description available.

The aim of the paper "Instalace hybridních lamp v České republice" is to reflect on the worldwide phenomenon of renewable energy and its usage in everyday life in the form of a street lighting. Hybrid lamps are particular for the combination of the wind and solar power they generate thanks to the wind turbine and photovoltaic panels they carry. In order to evaluate their possible installation in the Czech Republic the business plan is viewed from four different perspectives - technological, economic, ecological and legal.

The aim of our study is to ascertain whether a hanging suspension fluorescentlamp for a private home environment is going to be attractive for a largeaudience. We want to open up for new uses of fluorescent lamps as lightsources.The main approach in this work is how to design a fixture with fluorescentlamps as a light source that will meet the requirements and requests of thehome environment could look like. At the same time we want to make a newimpression of how a fluorescent light source.Primarily we used a quantitative method, but this was rejected after a pilotstudy. Instead we used a qualitatively based method in the sense that weconducted a group interview as well as individual interviews.Based on data from the interviews and our preliminary work a prototype wasbuilt. This prototype is a fluorescent fixture equipped with 2x14W T5fluorescent lamps, dimmed separately. The shape can be described as a soft,organic elongated oval. The luminary screen is made of rice paper, which givesa soft and pleasant light transmission. Access to the interior and electronics isprovided via the open ends of the screen, which is concealed by two endcapsules in plastic. The luminary is a hanging suspension via two wires fromthe ceiling, down to a metal bracket with the same curvature as the luminaryscreen. This metal bracket is then attached to the fixture with wires attached tothe interior, which in turn holds the screen.Our main conclusion is that you can create a very attractive light fitting for theprivate home market. In addition, we concluded that in order to achievesufficient data in a quantitative based study you need more time than what ispermitted within the timeframe of our work. We believe more in the idea offirst develop a good and functional prototype and then ask a panel ofprospective customers what they think about it. Their response will thereafterbe worked in to the final product.KeywordsFluorescent Luminary, fluorescent lamps, fluorescent lamps and luminaries,market, rice paper, dimmableAbstractThe aim of our study is to ascertain whether a hanging suspension fluorescentlamp for a private home environment is going to be attractive for a largeaudience. We want to open up for new uses of fluorescent lamps as lightsources.The main approach in this work is how to design a fixture with fluorescentlamps as a light source that will meet the requirements and requests of thehome environment could look like. At the same time we want to make a newimpression of how a fluorescent light source.Primarily we used a quantitative method, but this was rejected after a pilotstudy. Instead we used a qualitatively based method in the sense that weconducted a group interview as well as individual interviews.Based on data from the interviews and our preliminary work a prototype wasbuilt. This prototype is a fluorescent fixture equipped with 2x14W T5fluorescent lamps, dimmed separately. The shape can be described as a soft,organic elongated oval. The luminary screen is made of rice paper, which givesa soft and pleasant light transmission. Access to the interior and electronics isprovided via the open ends of the screen, which is concealed by two endcapsules in plastic. The luminary is a hanging suspension via two wires fromthe ceiling, down to a metal bracket with the same curvature as the luminaryscreen. This metal bracket is then attached to the fixture with wires attached tothe interior, which in turn holds the screen.Our main conclusion is that you can create a very attractive light fitting for theprivate home market. In addition, we concluded that in order to achievesufficient data in a quantitative based study you need more time than what ispermitted within the timeframe of our work. We believe more in the idea offirst develop a good and functional prototype and then ask a panel ofprospective customers what they think about it. Their response will thereafterbe worked in to the final product. Keywords Fluorescent Luminary, fluorescent lamps, fluorescent lamps and luminaries,market, rice paper, dimmable

<p>The aim of our study is to ascertain whether a hanging suspension fluorescentlamp for a private home environment is going to be attractive for a largeaudience. We want to open up for new uses of fluorescent lamps as lightsources.The main approach in this work is how to design a fixture with fluorescentlamps as a light source that will meet the requirements and requests of thehome environment could look like. At the same time we want to make a newimpression of how a fluorescent light source.Primarily we used a quantitative method, but this was rejected after a pilotstudy. Instead we used a qualitatively based method in the sense that weconducted a group interview as well as individual interviews.Based on data from the interviews and our preliminary work a prototype wasbuilt. This prototype is a fluorescent fixture equipped with 2x14W T5fluorescent lamps, dimmed separately. The shape can be described as a soft,organic elongated oval. The luminary screen is made of rice paper, which givesa soft and pleasant light transmission. Access to the interior and electronics isprovided via the open ends of the screen, which is concealed by two endcapsules in plastic. The luminary is a hanging suspension via two wires fromthe ceiling, down to a metal bracket with the same curvature as the luminaryscreen. This metal bracket is then attached to the fixture with wires attached tothe interior, which in turn holds the screen.Our main conclusion is that you can create a very attractive light fitting for theprivate home market. In addition, we concluded that in order to achievesufficient data in a quantitative based study you need more time than what ispermitted within the timeframe of our work. We believe more in the idea offirst develop a good and functional prototype and then ask a panel ofprospective customers what they think about it. Their response will thereafterbe worked in to the final product.KeywordsFluorescent Luminary, fluorescent lamps, fluorescent lamps and luminaries,market, rice paper, dimmableAbstractThe aim of our study is to ascertain whether a hanging suspension fluorescentlamp for a private home environment is going to be attractive for a largeaudience. We want to open up for new uses of fluorescent lamps as lightsources.The main approach in this work is how to design a fixture with fluorescentlamps as a light source that will meet the requirements and requests of thehome environment could look like. At the same time we want to make a newimpression of how a fluorescent light source.Primarily we used a quantitative method, but this was rejected after a pilotstudy. Instead we used a qualitatively based method in the sense that weconducted a group interview as well as individual interviews.Based on data from the interviews and our preliminary work a prototype wasbuilt. This prototype is a fluorescent fixture equipped with 2x14W T5fluorescent lamps, dimmed separately. The shape can be described as a soft,organic elongated oval. The luminary screen is made of rice paper, which givesa soft and pleasant light transmission. Access to the interior and electronics isprovided via the open ends of the screen, which is concealed by two endcapsules in plastic. The luminary is a hanging suspension via two wires fromthe ceiling, down to a metal bracket with the same curvature as the luminaryscreen. This metal bracket is then attached to the fixture with wires attached tothe interior, which in turn holds the screen.Our main conclusion is that you can create a very attractive light fitting for theprivate home market. In addition, we concluded that in order to achievesufficient data in a quantitative based study you need more time than what ispermitted within the timeframe of our work. We believe more in the idea offirst develop a good and functional prototype and then ask a panel ofprospective customers what they think about it. Their response will thereafterbe worked in to the final product.</p><p>Keywords</p><p>Fluorescent Luminary, fluorescent lamps, fluorescent lamps and luminaries,market, rice paper, dimmable</p>

Thesis (Magister Technologiae - Discipline Electrical Engineering, Faculty of Engineering) -- Vaal University of Technology / Discomfort glare is a topic that has been investigated for many years without any reasonable explanation regarding its effect on the human visual system. Results of previous research concluded that established methods have a lot of similarities in implementation; but a number of differences when comparing the results of observer's evaluations with the mathematically calculated glare ratings. Therefore, an alternative method of evaluating the influence of exposure to an unshielded light source was investigated to establish a more reliable and realistic response from observers. In order to address the discrepancies of previous evaluation systems concerning observer's varying opinions regarding the level of discomfort experienced, it was decided to investigate the feasibility of evaluating the brain activity of the observers exposed to an unshielded incandescent lamp. This was done in order to facilitate the differences in each individual observer's sensitivity to bright light sources and the influence of personal taste therefore, eliminating the effect of personal interpretation. The main purpose of this study was to determine whether it would be possible to get any response regarding brain functions when an observer is exposed to a bare light source. In order to determine the pathway of visual stimuli it was necessary to investigate the operating principles of the human eye in detail. Because the eye is only an instrument that makes seeing possible; it was also important to investigate the brain and all its different functions. The part of the brain where visual interpretation takes place was indicated as the occipital lobe. This is the part of the brain monitored for any change of functional status by taking measurements with an electroencephalogram (EEG). Measurements were indeed possible; it was presented as a suppression of the alpha brain activity. During the testing procedure it was observed that the observers were not equally photosensitive. There was also a difference in the amount of alpha suppression with the observer's eyes open and closed respectively. Because the alpha rhythm has a tendency to increase with closed eyes it was much easier to notice the suppression.

As zeólitas sintéticas contendo terras raras (TR) são os componentes principais de catalisadores FCC (Fluid Catalytic Cracking) empregados no craqueamento do petróleo e a porcentagem de TR nestes catalisadores pode chegar a 5%. As TR são adicionadas às zeólitas tipo Y para melhorar sua estabilidade térmica e hidrotérmica durante o processo de refino do petróleo. A produção brasileira destes catalisadores está em torno de 25 mil toneladas por ano, necessitando, para tanto, de 900 toneladas de óxido de lantânio no mesmo período. Atualmente, a China é responsável por 90% da produção e comercialização mundial das TR. Desde 2010, a China controla os preços das mesmas (ao final de 2011 chegou a elevar o preço do lantânio em mais de 20 vezes), bem como reduziu substancialmente sua cota de exportação. É nesse contexto que surge a necessidade da reciclagem de materiais que possuem TR em sua constituição, como é o caso dos catalisadores FCC provenientes do craqueamento do petróleo. Outra fonte que merece destaque, tendo sido igualmente explorada neste trabalho, é os pós-fosfóricos responsáveis por gerar a luz branca em lâmpadas fluorescentes. Atualmente a Rhodia, do grupo Solvay, já iniciou a recuperação das TR em pós-fosfóricos. As principais TR utilizadas em lâmpadas fluorescentes são La, Ce, Eu, Tb e Y, encontrados nos compostos Y2O3:Eu3+, BaMgAl10O17:Eu2+ e LaPO4:Ce3+,Tb3+. Os elementos Eu, Tb e Y têm alto valor agregado, representando de 5 a 20% em massa dos pós-fosfóricos. Sendo assim, o objetivo deste trabalho foi desenvolver uma metodologia economicamente viável e, sobretudo, com baixa utilização e produção de substâncias perigosas para a separação e recuperação de íons de TR contidos na zeólita tipo Y, componente dos catalisadores FCC desativados, previamente empregados no craqueamento de petróleo, bem como em lâmpadas fluorescentes. Inicialmente, realizou-se a caracterização preliminar dos componentes dos catalisadores FCC desativados. Posteriormente, buscou-se o desenvolvimento de metodologias de separação química para obtenção dos elementos de TR e caracterização dos mesmos por diversas técnicas, tais como espectroscopia de fotoluminescência, fluorescência de Raios-X, titulometria de complexação, microscopia eletrônica de varredura e espectroscopia de infravermelho / Synthetic zeolites containing rare earths (RE) are the major components of FCC (Fluid Catalytic Cracking) catalysts used in petroleum cracking, where the percentage of such elements is about 5%. RE ions improve the thermal and hydrothermal stability of zeolites-Y during the petroleum refining process. The Brazilian production of these catalysts is around 25 thousand tons per year, requiring 900 tons of lanthanum oxide in the same period. Currently, China is responsible for 90% of the world production and market of RE. Since 2010, China controls the prices of RE elements and substantially reduced the exportation quota. For instance, by the end of 2011 the price of lanthanum was risen by more than 20 times. In this context, the search for recycling materials that have rare earths in their constitution becomes crucial, as is the case of the FCC catalysts from the cracking of petroleum. Another source that deserves significant attention is the phosphoric powders that generate white light in fluorescent lamps, which were also investigated in this work. Rhodia from the Solvay group has already begun the recovery of rare earths in phosphoric powders. The main RE used in fluorescent lamps are La, Ce, Eu, Tb and Y, which occur as Y2O3: Eu3+, BaMgAl10O17:Eu2+ and LaPO4:Ce3+, Tb3+. Eu, Tb and Y are high-value elements, representing by 5 20% of the total mass of phosphoric powders. Therefore, the aim of this work was to develop economically feasible and environmental friendly methodologies for the separation and recovery of RE ions from zeolite-Yin deactivated FCC catalysts and from fluorescent lamp phosphors. To this end, we firstly performed a preliminary characterization of the components of deactivated FCC catalysts. The following steps comprised the development of chemical separation methodologies to obtain rare earth elements and their characterization by several techniques such as photoluminescence spectroscopy, X-ray fluorescence, complexation titration, scanning electron microscopy and infrared spectroscopy

Este projeto teve como finalidade construir uma fonte de luz baseada em lâmpadas halógenas que apresentasse características técnicas adequadas para aplicações em fotobiologia e fotomedicina, versátil e comercialmente viável. Foram analisadas as características de diferentes lâmpadas halógenas e realizados os experimentos com duas lâmpadas escolhidas, das quais utilizamos a lâmpada de menor divergência luminosa. Foi analisado também o material do corpo da fonte, com relação a características de aquecimento e peso, sendo escolhido um corpo de alumínio produzido industrialmente. Foram avaliadas as características ópticas das lentes, sendo escolhidas as lentes de vidro utilizadas em retroprojetores. Foram analisados os materiais e a construção de filtros térmicos para diminuir o aquecimento do objeto sob irradiação, sendo que escolhemos construir um filtro térmico próprio, que utiliza a água como absorvedor de calor. Medimos e avaliamos as características: espectrais, térmicas, a potência radiante (irradiância) e sua distribuição espacial de três protótipos, onde cada um recebeu modificações de modo a torná-los mais adequados para aplicações na fotoquimeoterapia. Foram também realizados testes preliminares de fotocitotoxicidade do protótipo final com o composto fotossensibilizador de nome comercial Photogem® aplicado em células tumorais de adenocarcinoma de colo retal humano (HT29), cujo resultado foi a ativação do composto fotossensibilizador e indução da morte celular. / The aim of this work was to produce a light source based in halogen lamps. This source should have appropriated technical characteristic for application in photobiology and photomedicine, it has easy operation and be commercially viable. The characteristics of different halogen lamps were evaluated and the lamp of smaller luminous divergence was chosen. We also have evaluated the material of the source holder, especially heating characteristics and weight; finally we chose an aluminum holder. Then, the lenses optical characteristics were studied, and we decided that the glass lenses used in projectors were the best. The materials and the construction of thermal filters were evaluated in order to reduce the heating of the object under irradiation, and we preferred to construct a thermal filter, that uses water as an heat absorber. The spectral and thermal characteristics, the radiant power (irradiance) and its space distribution of three prototypes were measured and evaluated, each one received modifications to become more appropriated to applications in photochemotherapy. We also made preliminaries tests of photocytotoxicity and the final prototype was used with the photosensitizer (Photogem®) in human colon carcinoma cell lines HT-29, resulting in the photosensitizer activation, that induced cellular death.

O presente trabalho procura a articulaçao das produções de cerâmicas de iluminação romanas tipo discus que estiveram em circulação no Orbis Romanorum durante o séculos II e III EC. A análise comparativa dessas produções tendo inerente a sistematização de dados físico-químicos das argilas de confecção dos objetos pode prover interessantes inferências sobre os locais de fabrico, relações de ruptura e continuidade de estilos e sistemas tecnológicos, bem como fomentar dados para o entendimento da co-constituição do espaço e identidade cultural dos grupos sociais que se utilizaram desses artefatos na paisagem / This PhD dissertation studies the production and distribution of Roman oil lamps made of clay in the Orbis Romanorum during 2nd and 3nd CE by means of thin-section analysis and comparative research, in order to identify workshops in the Levant. The results are compared with modes of production and distribution of Roman oil lamps of North African workshops, against their social and economic implications. This comparative research seeks trends of continuity, discontinuity and change of style and technology in order to foster our understanding of space and cultural identity definition amongst social groups that used clay lamps as social and mental marker