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Space-selective Control of Functional Properties in Transparent Materials by Femtosecond Laser Irradiation / フェムト秒レーザー照射による空間選択的な透明材料の機能性制御Shimizu, Masahiro 26 March 2012 (has links)
Kyoto University (京都大学) / 0048 / 新制・課程博士 / 博士(工学) / 甲第16865号 / 工博第3586号 / 新制||工||1542(附属図書館) / 29540 / 京都大学大学院工学研究科材料化学専攻 / (主査)教授 平尾 一之, 教授 三浦 清貴, 教授 田中 勝久 / 学位規則第4条第1項該当
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Desempenho térmico e visual de elementos transparentes frente à radiação solar / Thermal and visual performance of transparent elements related to the solar radiationSantos, Joaquim Cesar Pizzutti dos 23 August 2002 (has links)
A especificação das vedações transparentes é uma das decisões mais complexas no âmbito do projeto arquitetônico. Envolve diversos fatores construtivos e de necessidades humanas relacionadas ao conforto ambiental, associadas a uma grande variedade de produtos disponíveis no mercado. Este trabalho busca facilitar aos projetistas esse processo de especificação, fornecendo valores dos parâmetros de desempenho dos elementos transparentes em relação à análise do conforto térmico e visual, coerentes com a realidade climática brasileira e com a real incidência da radiação solar ao longo do dia. Foram estudados os vidros comuns, laminados e refletivos, e as películas de controle solar, policarbonatos e acrílicos usados em edificações no Brasil. Foi utilizada a análise por espectrofotometria para a obtenção dos valores de refletância, transmitância a absortância para as diferentes regiões do espectro solar, com ângulos de incidência variados. A partir do relacionamento desses resultados, considerando o comportamento similar de variação do Fator do Calor Solar (FCS) e da Transmitância da Luz Visível (Tv) com o ângulo de incidência, foi desenvolvida uma metodologia que possibilita o cálculo simplificado de ganhos de calor e luz natural. / The specification of the transparent elements is one of the most complex decisions in the ambit of the architectural project. It involves several constructive factors and human necessities related to the environmental comfort, associated to a great variety of available products in the market. The aim of this work is to facilitate the specification process to the planners, supplying values of the performance parameters of the transparent elements in relation to the analysis of thermal and visual comfort, coherent with the Brazilian climatic reality and with real incidence of the solar radiation along of the day. It were studied the ordinary, laminate and reflective glasses, the solar control films, policarbonates and acrylic used in Brazilian constructions. The spectrophotometry analysis was used to obtain the reflectance, the transmittance and the absortance values for the different regions of the solar spectrum, with varied incidence angles. Starting from the relationship of those results, considering the similar behavior of variation of the Solar Heat Factor (FCS) and of Transmittance of the Visible Light (Tv) with the incidence angle, it was developed a methodology that facilitates the simplified calculation of heat and natural light gains.
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Synthesis and processing of nanocrystalline YAG (Yttrium Aluminium Garnet) ceramicsRamanujam, Prabhu January 2014 (has links)
Transparent ceramics are used in a variety of applications such as protective visors, thermo-graphic lens, night vision devices and windowpane of an armed vehicle, missile domes and in aircrafts. Yttrium Aluminium Garnet (YAG, Y3Al5O12) exhibits uniform index of refraction without birefringence owing to its cubic crystal structure and offers a range of optical and mechanical properties that makes it suitable for transparent applications.
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Desempenho térmico e visual de elementos transparentes frente à radiação solar / Thermal and visual performance of transparent elements related to the solar radiationJoaquim Cesar Pizzutti dos Santos 23 August 2002 (has links)
A especificação das vedações transparentes é uma das decisões mais complexas no âmbito do projeto arquitetônico. Envolve diversos fatores construtivos e de necessidades humanas relacionadas ao conforto ambiental, associadas a uma grande variedade de produtos disponíveis no mercado. Este trabalho busca facilitar aos projetistas esse processo de especificação, fornecendo valores dos parâmetros de desempenho dos elementos transparentes em relação à análise do conforto térmico e visual, coerentes com a realidade climática brasileira e com a real incidência da radiação solar ao longo do dia. Foram estudados os vidros comuns, laminados e refletivos, e as películas de controle solar, policarbonatos e acrílicos usados em edificações no Brasil. Foi utilizada a análise por espectrofotometria para a obtenção dos valores de refletância, transmitância a absortância para as diferentes regiões do espectro solar, com ângulos de incidência variados. A partir do relacionamento desses resultados, considerando o comportamento similar de variação do Fator do Calor Solar (FCS) e da Transmitância da Luz Visível (Tv) com o ângulo de incidência, foi desenvolvida uma metodologia que possibilita o cálculo simplificado de ganhos de calor e luz natural. / The specification of the transparent elements is one of the most complex decisions in the ambit of the architectural project. It involves several constructive factors and human necessities related to the environmental comfort, associated to a great variety of available products in the market. The aim of this work is to facilitate the specification process to the planners, supplying values of the performance parameters of the transparent elements in relation to the analysis of thermal and visual comfort, coherent with the Brazilian climatic reality and with real incidence of the solar radiation along of the day. It were studied the ordinary, laminate and reflective glasses, the solar control films, policarbonates and acrylic used in Brazilian constructions. The spectrophotometry analysis was used to obtain the reflectance, the transmittance and the absortance values for the different regions of the solar spectrum, with varied incidence angles. Starting from the relationship of those results, considering the similar behavior of variation of the Solar Heat Factor (FCS) and of Transmittance of the Visible Light (Tv) with the incidence angle, it was developed a methodology that facilitates the simplified calculation of heat and natural light gains.
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CONTRIBUIÇÃO TERMO-ENERGÉTICA DOS FECHAMENTOS TRANSPARENTES EM EDIFÍCIOS COMERCIAIS CLIMATIZADOS ARTIFICALMENTE EM SANTA MARIA-RS / THERMAL ENERGY CONTRIBUTION TO TRANSPARENT CLOSURE IN ARTIFICIALLY CONDITIONED COMMERCIAL BUILDINGS IN SANTA MARIA-RSZófoli, Giana da Rocha 13 December 2011 (has links)
This paper analyzes the influence of the penetration of solar radiation through the
transparent closure in consumption of energy for conditioning of the office buildings
in the region of Santa Maria-RS, located in the bioclimatic Brazilian zone 2. To do
this, simulations were performed in the computational program Design Builder, in a
typical office environment in order to evaluate the comparative results obtained with
the use of different types of glass (Solar Factor) by different percentages of area of
windows and surface guidelines. The glasses used had solar factor ranging from
0.85, 0.70, 0.56 and 0.29, an opening percentage area of 20%, 50% and 80%, while
the solar orientation ranged from 0° to 315° at an interval of 45°. It was observed that
for the climate of the city of Santa Maria-RS, considering the daytime use of the
building, the consumption of energy for cooling process has higher values compared to
the heating and that this difference is directly proportional to the solar factor of the
glass and the percentage of openings in the facade. Changes that contribute to a
reduction of one of these lead to an increased consumption of the other, these should
be analyzed jointly in the process of defining the openings, in order to obtain the lowest
annual energy consumption. The simulations indicated higher expenditure of energy
with heating on the facades oriented to the south, southeast, and southwest, while the
higher cost for cooling occurred on facades oriented to the north, northeast, northwest,
regardless of the solar factor or percentages of openings in façade. It was observed
that, when established constructive guidelines regarding apertures in construction
performance standards for buildings, should be considered together the percentage
of area openings, Factor Solar glass and solar orientation of the facade, as the
exchanges of heat and entry lighting are naturally associated with these factors in an
integrated manner. / Este trabalho analisa a influência da radiação solar que penetra pelos fechamentos
transparentes no consumo de energia para climatização de edifícios de escritório na
região de Santa Maria RS, situado na zona bioclimática 2 brasileira. Para isso,
foram realizadas simulações no programa computacional Design Builder, em um
ambiente típico de escritório, visando avaliar comparativamente os resultados
obtidos com o uso de diferentes tipos de vidro (Fator Solar), mediante diferentes
percentuais de área de janelas e orientações de fachada. Os vidros utilizados têm
valores de Fator Solar variando de 0.85, 0.70, 0.56 e 0.29, o percentual de área de
abertura de 20%, 50% e 80%, enquanto a orientação solar variou de 0° a 315°, com
intervalo de 45°. Foi observado, para o clima da cidade de Santa Maria-RS,
considerando-se o uso diurno do edifício, que o consumo de energia para
resfriamento apresenta valores mais elevados em relação ao aquecimento, e que esta
diferença é diretamente proporcional ao Fator Solar do vidro e ao percentual de
aberturas na fachada. Mudanças que colaboram para a redução de um destes
consumos levam ao aumento do outro, devendo-se analisá-los de forma conjunta, no
processo de definição das aberturas, para que se obtenha o menor consumo anual de
energia. As simulações indicaram maiores gastos de energia com aquecimento nas
fachadas orientadas para sul, sudeste e sudoeste, enquanto os maiores gastos com
resfriamento ocorrem com fachadas orientadas a norte, nordeste e noroeste,
independente do Fator Solar do vidro ou do percentual de aberturas na fachada. Foi
observado que, ao serem estabelecidas diretrizes construtivas referentes a
aberturas em normas de desempenho de edificações, devem ser considerados
conjuntamente o percentual de área de aberturas, o Fator Solar do vidro e a
orientação solar da fachada, pois as trocas de calor e entrada de iluminação natural
estão associadas a estes fatores de forma integrada.
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Caractérisation des propriétés thermiques de liquides semi-transparents à haute température : application aux liquides silicatés / Characterization of the thermal properties of semi-transparent liquids at high temperature : Application to molten silicatesMeulemans, Johann 20 July 2018 (has links)
Le sujet de l'étude concerne la caractérisation des propriétés thermiques de liquides semi-transparents à haute température : les liquides silicatés. La caractérisation de ces matériaux est particulièrement délicate car il faut séparer les contributions des différents modes de transfert thermique (conduction, convection et rayonnement) si l'on veut mesurer des propriétés intrinsèques. Le dispositif expérimental est basé sur une méthode pulsée de type flash. La cellule de mesure, placée au centre d'un four tubulaire, est soumise à une excitation délivrée par un laser continu et l'élévation de température est mesurée à l'aide d'un détecteur infrarouge sur la face opposée à l'excitation. La modélisation du problème direct prend en compte le couplage conducto-radiatif en résolvant l'équation de la chaleur en régime transitoire et l'équation de transfert radiatif (ETR) pour un milieu gris émettant, absorbant et non diffusant à l'aide de la méthode des harmoniques sphériques (approximation P1). La méthode développée permet d'estimer simultanément la diffusivité thermique et un coefficient d'absorption moyen (gris) par méthode inverse. Les résultats expérimentaux obtenus sur des liquides silicatés présentant des propriétés radiatives différentes (i.e., des coefficients d'absorption différents) valident la méthode de caractérisation développée et mise en œuvre dans nos travaux / The study deals with the characterization of the thermal properties of semi-transparent liquids at high temperature: molten silicates. The characterization of such materials is particularly challenging because the contributions of the different heat transfer modes (conduction, convection and radiation) should be accounted for to allow the measurement of intrinsic properties. The experimental setup is based on a transient pulse method derived from the flash method. A heat flux stimulation is generated on the front face of an experimental cell, placed at the center of a tube furnace, with a continuous laser beam and the temperature rise is measured by an infrared detector on the opposite side. The modeling of the direct problem takes into account the conducto-radiative coupling by solving both the heat equation and the radiative transfer equation (RTE) for a gray emitting, absorbing but non-scattering medium with the spherical harmonics method (P1 approximation). The developed method allows to simultaneously estimate the thermal diffusivity and a mean (gray) absorption coefficient by an inverse method. The experimental results obtained on molten silicates with different radiative properties (i.e., different absorption coefficients) validate the characterization method developed and implemented in our work
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Aplikace metod rozpoznávání obrazu v defektoskopii / Applied Methods for Transparent Materials InspectionHorák, Karel January 2008 (has links)
A lot of production lines contain camera inspection systems that increase quality of production. Therefore this presented work deals with applications of computer image processing methods in defectoscopy. Concretely the thesis is concerned with defects evaluation of glass bottles in food operations by the help of visual system BTCAM612, which is in existing configuration installed inland and in several foreign countries. The system is developed in conjunction with developer company CAMEA Ltd. from Brno and it is its sole ownership. The whole process of bottles inspection is described in sequence. First of all it is the hardware acquisition of images of three main controlled parts of bottles – neck, bottom and side. Next chapters are concentrated on image processing and features classification. The features are obtained from image by methods based on detection of in-homogeneities on glass material. Essential part of work is focused on filtration of synthetic patterns from bottles bottoms using function of complex invariants. These patterns are occurred especially in many plants in eastern countries, where marketplace with inspection systems and generally with quality inspection of industrial lines is expanded lately.
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Modélisation et simulation du remplissage de moules verriers : "Prise en compte du transfert radiatif" / Modeling and simulation of glass mould filling taking into account radiative transferNguyen, Hoang Quan 02 October 2009 (has links)
L’objet de ce travail est de proposer un modèle adapté pour la simulation du remplissage de moules qui réponde au meilleur compromis entre temps de calcul et précision des résultats. La difficulté est double. Il faut prendre en compte le phénomène de remplissage qui est un problème complexe à frontières libres et les spécificités liées au Verre : viscosité fortement thermodépendante et température de fusion élevée qui nécessite de prendre en compte le rayonnement. Le Chapitre I est consacrée à la partie écoulement du Verre liquide. La bibliothèque numérique Aquilon/Thétis, adaptée pour traiter ce type de problèmes et les couplages thermique air/verre/parois, a été utilisée (Méthode V.O.F pour le suivi de l’interface, méthodes de type Lagrangien augmenté/Projection vectorielle pour le couplage Vitesse-Pression). Pour l’aspect radiatif, différentes approches sont proposées : conductivité radiative équivalente (Chapitre II), méthode explicite directe pour la validation (Chapitre III) et méthode d’harmoniques sphériques ou méthode PN (Chapitre IV). Dans le Chapitre V, la méthode PN retenue est validée dans des cas simples et est appliquée ensuite à des cas avec couplage convectif en géométries complexes et obstacles semi-transparents (1D, 2D et 3D, 2D axi-symétrique et milieu non gris). Une version P1 modifiée est présentée. Les résultats sont assez proches de ceux donnés par la méthode P3 avec des temps de calcul modestes. L’intérêt de ce modèle est qu’il est facilement intégrable dans des codes numériques existants : une seule équation différentielle du second ordre stationnaire à résoudre en 3D / The aim of this study is to propose an adapted model for the simulation of mould filling that must be a compromise solution between computational time and results accuracy. The double difficulty is to take into account the filling phenomenon that is a complex problem due to the presence of free boundaries and to the Glass specificities: viscosity that is highly thermal dependant and high melting temperature that requires taking into account radiation effects. Chapter I is devoted to the melting Glass flow. The numerical libraries Aquilon/Thétis, adapted for solving such type of problems and the thermal coupling between Air/Glass/Walls, has been used. (V.O.F method for front tracking, Augmented Lagrangian/Vector Projection methods for solving Pressure/Velocity coupling). For radiative aspect, different approaches are proposed: equivalent radiative conductivity (Chapter II), direct explicit method for validation (Chapter III) and spherical harmonics method or PN method (Chapter IV). In the Chapter V, the selected PN method is validated through simple cases and is then applied in other cases with convective coupling in complex geometries including semi-transparent inclusions (1D, 2D and 3D, 2D axi-symmetric and non grey medium). A P1 modified version is presented. The results are close to those given by P3 method but with reduced computational time. The main interest of this model is that it can be easily implemented in existing numerical codes: a single stationary second order partial differential equation to solve in 3D
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Transparency and learning spacesFinau, Emily 08 April 2011 (has links)
This thesis explores the various meanings and implications of transparency in architecture and in learning environments in particular. Architectural transparency, achieved through choice of materials and principles of formal composition, creates a diversity of relationships and can facilitate visual, conceptual, and functional clarity as well as offering simultaneous perception of different spaces. It offers a range of phenomenological qualities and so provides an opportunity to explore and complicate such dichotomies as translucency and opacity, openness and closure, and public space and private space.
While celebrated throughout modern and contemporary architecture, transparency raises issues of privacy and safety even as it breaks down hierarchies and social boundaries. The research-based design of transparency in a school building necessitates careful planning to achieve a balance between the access to views, natural light, fresh air, and social interaction that transparency may bring and the continuing obligation to provide a safe, secure environment for schoolchildren.
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