Дисертації з теми "Light"
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1
Segovia, Benjamin. "Interactive light transport with virtual point lights." Lyon 1, 2007. http://www.theses.fr/2007LYO10190.
Анотація:
Depuis maintenant vingt ans, la synthèse d'image par ordinateur s'est tournée vers un désir toujours plus grand de représenter fidèlement la réalité. Le but est donc devenu de calculer des images plus réalistes visuellement et plus précisément, physiquement réalistes: ceci a donc impliqué de décrire avec précision les phénomènes lumineux impliqués dans l'impression de toute photographie, leurs modèles intrinsèques et les équations sous-jacentes qui les régissent. Dans le domaine du rendu hors-ligne, des schémas numériques et des algorithmes de rendu efficaces et performants ont déjà été explorés et mis au point. Par conséquent, même s'il est encore possible de les améliorer, les problèmes les plus attrayants sont aujourd'hui ceux liés à l'affichage en temps réel d'images photo-réalistes qui consiste assurer un taux de rafraîchissement de 20 images par seconde tout en offrant à l'utilisateur un certain degré d'interactivité. Dans le cadre de cette thèse, je me suis donc concentré sur le calcul et la représentation en temps réel ou à défaut, interactive de la simulation des phénomènes physiques liés au transport de la lumière. Plus précisément, j'ai d'une part essayé d'utiliser efficacement le matériel informatique couramment utilisé aujourd'hui, comme les processeurs graphiques spécialisés ou encore les jeux instructions et les possibilités offertes par les processeurs centraux. D'autre part, j'ai proposé de nouvelles méthodes numériques qui peuvent être aisément mises en oeuvre dans de tels systèmes. C'est finalement le rôle de tout numéricien: combiner subtilement et efficacement schémas numériques et algorithmesSince about twenty years, the field of computer graphics has been striving towards increased realism. The goal is to achieve photorealistic outputs, which actually involves to precisely describe lighting phenomena, their intrinsic models and the light transport equations and to finally propose numerical schemes to solve them. In the field of off-line rendering, efficient and aggressive numerical methods have already been explored and set up. Therefore, even if there is still room for improvement, the most challenging and appealing problems are today related to real-time rendering which consists in ensuring to display at least 20 frames per second with some interactivity offered to the user. In this Ph. D. Thesis, I therefore focus on the real-time or, if not possible, interactive simulation of light transport phenomena. During the three years while I tried to propose new ideas, I thus mainly aimed at efficiently using current existing hardware systems, GPUs or CPUs and designing new numerical schemes which may be easily implemented in such systems. It is finally the most common role of numericians: making a subtle mixture of mathematical and algorithmic methods and efficiently combining them
2
O, Yin Wan. "White light organic light emitting device." HKBU Institutional Repository, 2008. http://repository.hkbu.edu.hk/etd_ra/907.
3
Glenney, Brian Edmund. ""Light, more light" the "Light" newspaper, spiritualism and British Society, 1881-1920 /." Connect to this title online, 2009. http://etd.lib.clemson.edu/documents/1256570535/.
4
Mongrut, Steane Andrés. "The shape of light : Light Research Laboratory." Thesis, KTH, Arkitektur, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-155164.
Анотація:
This project investigates the relationships between form and light in architecture. It explores how light as matter can be manipulated and used in material and spatial practices, to develop into habitable spaces with complex spatial relations.Detta projekt undersöker förhållandet mellan form och ljus i arkitekturen. Undersökningen fokuserar på ljus som materialiseras och manipuleras som sedan används I materiella och rumsliga metoder. Med målet att utvecklas till beboeliga rum med komplexa rumsliga relationer.
5
Babuščák, Ladislav. "Light Into The Flesh / Flesh Into The Light." Master's thesis, Akademie múzických umění v Praze. Filmová a televizní fakulta AMU. Knihovna, 2011. http://www.nusl.cz/ntk/nusl-96893.
Анотація:
LIGHT INTO THE FLESH / FLESH INTO THE LIGHT explores symbols of evil, sin and redemption in the tv series and the movie Twin Peaks. It is not a critical assessment of David Lynch's body of work. Characters and their actions as well as plots are used as symbols which are then explained based on Genesis, the first book of the Old Testimony. Martin Buber's philosophical insight is also used to shed light on the subject.
It is not the aim of this analysis to introduce David Lynch's work from a critical standpoint or from a standpoint of film theory. The aim is to introduce director's key theme, which is one's fight for his soul (essence) whilst facing fear, hesitation, failure but also love, faith and hope.
6
Chen, Tzu. "Light Force: An Exploration of Light Through Design." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/32314.
7
Larsson, Malin. "Night, light and flight : Light attraction in Trichoptera." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-139865.
Анотація:
Artificial light is an important and necessary part of our urban environment, but has become a threat to biodiversity. It can have substantial direct and indirect effects on populations of all kinds of organisms. While light attraction in bats and moths has been well studied other organisms such as Trichoptera have been largely neglected, despite Trichoptera being one of the most abundant insect orders in freshwater systems. The light attraction of Trichoptera was studied through seasonal data from three different locations in Sweden. The data was examined through meta- and regression analyses to compare catches in light traps and passive traps. The use of relative abundances excluded bias from the species with large populations, and the difference in individuals caught between passive traps and light traps. The results indicated that artificial light could affect Trichoptera populations. Unlike moths, female Trichoptera were more attracted to light than males and attraction to light varied between species. In both cases, size dimorphism could explain the variation. Day-, evening- and night-active species were all attracted to light, but the latter more so. Research has shown that a false flight activity can occur in day-active Trichoptera when a lamp is lit during night, which could explain the capture of day- and evening-active species in a light trap. In all, artificial light could alter Trichoptera populations, changing sex ratios and species composition. This impact should be considered when erecting light sources near waterways.
8
Larson, Sofia. "Casting Light : The relation between space and light." Thesis, Konstfack, Institutionen för design, inredningsarkitektur och visuell kommunikation (DIV), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:konstfack:diva-5570.
Анотація:
I investigate light as a variable that defines and re-defines space. I develop a technique to implement this theory in physical space. The space becomes a tool to further explore how light affects space, and how I can create a space that interoperates the change in light. I work physically, investigating, in model and full scale. I develop the principal as well as details of the space. Both are of great importance to the impression of the space. My investigation into light begun as a norm-questioning way of measuring space. How can we study space without numbers and hard values? And what spaces can we create if we break free from the flat norm? I study how light can change our perception of a surface. I started investigate in model how I could manipulate the perception of surfaces through changing the light inlet and how I could sculpt surfaces to make them appear different in different light conditions. The relation between inlet and surface became the principal that I started developing space with. I found that the directions of a surface structure is where I can control the appearance of a surface. By casting plaster I develop surfaces with directions and study light on them. I started developing elements with directions that I assemble into one structure. I use plaster to create the elements. Plaster is interesting in the process of casting, the material goes from being able to take any shape, to become static and unchangeable, unless you break it. The plaster has the properties that it copies features from other materials, such as the shiny surface of the rubber. The plaster gets a beautiful surface that in combination with its color reveals light well. The space I’ve created is based on directions and how light changes its appearance. In one light, a veil like structure in gray and in another a contrasting with a shadows casted and fragmented on the surface.
9
Torres, Tur Elías Torres Tur Elías Torres Tur Elías. "Zenithal light /." Barcelona : Coac, 2004. http://opac.nebis.ch/cgi-bin/showAbstract.pl?u20=8496185435.
10
Dracoulis, Wendy Fay, and wdracoulis@gmail com. "Coloured light." RMIT University. Art, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080102.093428.
Анотація:
This project involves the examination of abstract, geometric paintings, kinetic sculptures, electronic art and installations that use opticality, perspectival space and colour relationships that destabilise compositional cohesion. Works made between 1964 and 1980, particularly those by Victor Vasarely and Bridget Riley are referenced in the determination of how geometric forms, colour transitions, interactions and juxtapositions have been used to suggest movement. This enquiry includes a review of the usage of planar space and the creation of optical effects. Artworks such as Bridget Riley's Chant 2, (1967) inform new works in which available digital technological processes are utilised. These new works consist mainly of compositions of line and coloured forms and are created in response to the outcomes of the research into the selected works. For example, static works that create movement through the use of colour and geometric form inform the creation of new w ork in media that uses motion. The artworks produced are installation-based works. The works include digital projections and static images that use painting processes as well as digital media. The objective of the project is to produce artworks that reference painting processes and extend explorations into colour usage designed to maximise optical effects and spatial disorientation. The artworks are intended to reflect elements researched whilst maximising the potential for using new media.
11
Winterfield, Sarah L. "Traveling Light." Digital Archive @ GSU, 2010. http://digitalarchive.gsu.edu/english_theses/95.
Анотація:
This thesis represents a compilation of eleven short stories (fiction) prefaced by one introductory essay presenting the major themes of the stories, which are families, love, loss and the fissures these create in the human heart.
12
Au, Ka-lun Adrian, and 區嘉麟. "Light pollution." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B45170253.
13
Ito, Christine. "Light Pollution." Digital Commons at Loyola Marymount University and Loyola Law School, 2013. https://digitalcommons.lmu.edu/etd/402.
Анотація:
Although pollution can take many different forms, it is predominately thought of in the context of its effects on air, water, and soil. A lesser considered form of pollution is light pollution. And although its effects are less widely discussed than other types of pollution, light pollution adversely impacts a growing population of urban dwellers and wildlife. In addition, to impacting the health and safety of individuals and wildlife, light pollution impedes scientific exploration by observatories and consumes excessive amounts of energy. For example, wasted or unused lighting, consumes electricity above and beyond the minimum required to provide necessary lighting. In 2007, 22% ofthe United States' total electricity use powered lighting equating to 915 Terawatt hours (TWh) (Fighting Light Pollution 6-9). As a point of comparison, Russia's entire electricity consumption in 2010 was 915 TWh ("Key World Energy Statistics" 54). Considering only the financial benefit for reducing light pollution, a reduction of 1 TWh per year ($0.10/kWh) would yield $100 million USO in cost savings. Beyond the financial benefits of reducing light pollution, there would be a secondary benefit of decreasing the amount of non-renewable energy resources expended.
In contrast to other forms of pollution, the solutions for reducing light pollution are readily available and can produce near instantaneous results. For example, there are fixture options exist that shield or minimize the light trespass. Additionally, there exist a number of lamp bulb options that allows the appropriate brightness to be applied for each environment with a range of choices with different cost or energy efficiency. The effects of light pollution and impact of reducing light pollution are distributed and can only be realized when multiple disparate light systems incorporate reduction techniques.
This project predicts the energy and economic effects of widespread application of light pollution reduction design, while applying the systems engineering approach to define the notional requirements, architecture, and analysis tools for a single instance of a lighting system. The systems engineering artifacts are customizable for a specific lighting system. Additionally, the traditional stakeholder requirements have been mapped against light pollution objectives, underscoring the point that the two are not mutually exclusive-it is possible to build a lighting system that simultaneously meets user needs and reduces light pollution.
14
Fiorini, Jessica. "Light Suite." ScholarWorks@UNO, 2008. http://scholarworks.uno.edu/td/871.
Анотація:
Light Suite is a collection of the work I produced during my enrollment in the University of New Orleans Low Residency M.F.A. program. The writing, format and length styles reflect my experimentation with my craft. It also provides insight as to what my "poetic voice" is. Light Suite attempts to entwine personal experience with engaged observation and occasional flights of fantasy. The following poems illustrate my attempt at diversifying personal, poetic style. There are travel, prose, and accidental meaning poems. There are poems that feature personal narrative and collaboration. All of my works do share one characteristic and that is the close relationship with visual representation of an oral experience. I employ white space, line breaks, line length, assonance and consonance to create works that are as close to my speaking voice as possible.
15
McMillian, Christina A. "Light interaction." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/52581.
Анотація:
In the heart of a park, a path spirals up a hill. Follow it and the trees part to reveal a building halfway up. Its thick, rough walls are pulled apart at moments, allowing light and movement into the space. The path leads between the walls. The narrow passage continues in a counter-clockwise motion up a staircase, leading you towards the light; moving from opacity to transparency, darkness to light, thick to thin, and exploring the mo- ments between. The space marks the passage of time. You see sunrise, marked by three narrow slits oriented to capture the light on the Winter and Summer solstices, and Spring and Fall equinoxes. The curved walls leading from the white art glass windows cradle the light like a cupped hand. The midday sun illuminates the central core, translated through the medium of semi-circular, veneer screens. The light and wood interact, revealing what is hidden, allowing the glowing screens to illuminate the outer circle. On the opposite side of the space are similarly-oriented windows to capture the Summer, Spring, Fall, and Winter sunsets, completing the day. It is a space apart from the world into which only the light and the self may enter. The only view of the outside world is the changing sky at the center. It is a space looks at light and how it moves through, is captured by, or is reflected by material. Light changes the materials in the space, is changed by them and marks the passage of time -- days and the seasons.Master of Architecture
16
Spenello, Lisa Marie. "Light + Shadow." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23701.
Анотація:
Without light, there can be no shadows. Architectural decisions can be structured in such a way as to filter, manipulate, or diffuse light to create an array of conditions in which both light and shadow become part of the architecture itself. Light and shadow create spaces within a place, or a place inside of a space. They can define, emphasize, and disguise.Master of Architecture
17
Irwin, Brandon. "Light Affect." VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/2663.
Анотація:
My faith is an important factor in my art making. I believe the ability to create is endowed by an original Creator. My work continues this initial creative legacy while confronting viewers with a storyline of beauty, truth, justice, and redemption. I am a realist oil painter devoted to portraiture and figurative work. Human form, gesture, and facial expression provide inexhaustible subject matter. I depict narratives from antiquity to the present day. Some of my paintings contain spiritual elements based on biblical writings presented in a contemporary context. I work from photos that I take of family, friends, and strangers from all walks of life. I often digitally reorganize the imagery to create the most effective composition in telling a story. Extreme contrast of light and dark is a crucial component of my current work. With it, I explore the dichotomy of revelation versus concealment. I also create pottery intentionally rooted in utilitarian traditions. I work with wheel- thrown and hand-built stoneware and I decorate it with a basic glaze palette. I appreciate how handmade ceramics add an organic, creative touch to everyday objects, as opposed to the inorganic and impersonal nature of mass produced ware. Furthermore, each unique vessel is a manifestation of the endowed gift of creativity interconnecting Creator, artist, and consumer.
18
Hill, Jay Scott. "Ancient Light." Thesis, North Texas State University, 1985. https://digital.library.unt.edu/ark:/67531/metadc501214/.
19
Turner, Carolyn A. "Burial light /." free to MU campus, to others for purchase, 1996. http://wwwlib.umi.com/cr/mo/fullcit?p9717155.
Анотація:
Thesis (Ph. D.)--University of Missouri-Columbia, 1996."This dissertation is a combination of a critical essay and an original collection of poems" -- P. [i]. Typescript. Vita. Includes bibliographical references (leaf 18). Also available on the Internet.
20
Thompson, Andrew. "Light Sensitive." CSUSB ScholarWorks, 2015. https://scholarworks.lib.csusb.edu/etd/245.
Анотація:
I am an excremental artist. I do not mean an artist who works with feces or is interested in manure but one whose artwork is expelled through the results of process. As a photographer, I am not as interested in indexing a location, a person or a moment as I am dissolving the structure of photography through the manipulation of photographic materials. I typically photograph landscapes that catch my attention for a myriad of reasons. The commonality between these images is anonymity of place. Hints of location are always present but never accentuated, instead their purpose is akin to a forging slug: raw blank material from which my artwork will be created. My photographic slugs are then entered into various processing systems that I have devised over the years. Common processing techniques that I incorporate include hand and machine stitching, chemically altering photographic paper and the integration of open-source electronics. These and other processes are mixed, matched and blended to form the corpus of my work.
The body of my work is not complete without my head, heart and hands. My intellectual interests are constantly feeding the physical processes described above. I have an extended engagement with photography’s rich history along with a critical commitment to philosophy. My intuition is permitted to work in concert with my intellect despite stark contrasts between the two. My intellect looks for structures and speaks in logical thought while my intuition arrives in waves of unarticulated emotions and ‘gut feelings’. The heart’s language is often more difficult to translate than intellectual headband but both are equally valuable in my process. Finally, my hands play a vital role in creating my art. They transcribe the conversation between the head and the heart and physically complete the processes defined prior.
My artwork is not conceived and the built into a structure, instead it is a result of the passing through a system. I consume copious amounts of stimuli (intellectually, visually, emotionally) and digest it through my creative process and the result is my artwork.
21
Tidström, Jonas. "Slow and stopped light by light-matter coherence control." Stockholm : Skolan för informations- och kommunikationsteknik, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11212.
22
Tidström, Jonas. "Slow and stopped light by light-matter coherence control." Doctoral thesis, KTH, Fotonik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11212.
Анотація:
In this thesis we study light-matter coherence phenomena related to the interaction of a coherent laser field and the so-called Λ-system, a three-level quantum system (e.g., an atom). We observe electromagnetically induced transparency (EIT), slow and stored light in hot rubidium vapor. For example, a 6 μs Gaussian pulse propagate at a velocity of ~1 km/s (to be compared with the normal velocity of 300 000 km/s). Dynamic changes of the control parameter allows us to slow down a pulse to a complete stop, store it for ~100 μs, and then release it. During the storage time, and also during the release process, some properties of the light pulse can be changed, e.g., frequency chirping of the pulse is obtained by means of Zeeman shifting the energy levels of the Λ-system. If, bichromatic continuous light fields are applied we observe overtone generation in the beating signal, and a narrow `dip' in overtone generation efficiency on two-photon resonance, narrower than the `coherent population trapping' transparency. The observed light-matter coherence phenomena are explained theoretically from first principles, using the Lindblad master equation, in conjunction with the Maxwell's equations. Furthermore, we analyze an optical delay-line based on EIT and show that there is in principle (besides decoherence) no fundamental limitation, but the usefulness today is scant. The combination of EIT and a photonic crystal cavity is inquired into, and we show that the quality value of a small resonator (area of 2.5λ×2.5λ with a missing central rod) can be enhanced by a factor of 500 due to the increased modal density close to two-photon resonance. Open system effects (decoherence effects) are thoroughly investigated using a coherence vector formalism, furthermore, a vector form of the Lindblad equation is derived. Specifically we find an open system channel that lead to slow light and gain.QC 20100812
23
Evans, Megan, and not supplied. "Towards a poetics of light: the conceits of light." RMIT University. Architecture and Design, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20070418.095100.
Анотація:
Towards a Poetics of Light; The Conceits of Light is a critical quest to map associations between rhetorical figures, psychological defences and spatial tropes in an attempt to conceive a poetic design that enacts conceit. Light is an emblem which echoes with an abundance of representations in literature, history, art and architecture and parallels may be drawn between their resemblances however apparently remote. Love, knowledge, hope and creative passion mark turns in the threads that knot ideas and their representations together. Return of the Immortals, the final project in a series of works exploring these parallels and representations, gathers together a cascade of tropes to structure a spatial experience which culminates in The Conceits of Light.
24
Spiteri, Michael Richard, and redgreen@bigpond net au. "Theatre of light - living images in shadows and light." RMIT University. Creative Media, 2009. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20090709.140613.
Анотація:
How the artist deals with death, loss and the spiritual has been a major theme of art throughout history. New media tools provide renewed opportunity to explore these themes while testing the tools against a familiar subject. This research attempts to deal with these themes by examining and reinterpreting them through myths while evaluating the tools of creative media. In so doing, this has the potential to uncover any revealing insights that are relevant to the times. The project uses myth to explore the potential of the interaction between 2D digital images and 3D virtual environments. Elements of particular significance in the 3D virtual environment - such as Lighting and Point of View - are examined from the perspective of an artist who has practised only in 2D. Twelve final works have been generated for this project and presented as large-scale digital prints, along with a short video piece. In particular, the research explores 3D lighting techniques of 2D images by applying theatrical protocols within a virtual, computer-generated environment, and using myth as context and driving principle. The idea of theatre 'flats' has been applied as a device within the virtual realm to provide a conceptual housing and rationale for virtual lighting techniques, virtual camera techniques, digital rendering and digital printing.
25
Chen, Chih-Lei. "Processing light-emitting dendrimers for organic light-emitting diodes." Thesis, University of Oxford, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.489420.
Анотація:
Light-emitting dendrimers with iridium(III) complex cores have given rise to some of the simplest and most efficient organic light-emitting diodes. However, whilst monochrome devices can be prepared there is currently no method for the patterning of the dendrimer films to give rise to pixelated colour displays. The main aim of this project was to develop methodology for the patterning of dendrimer films. In particular, dendrimers are designed that have an oxetane surface group that can be crosslinked to form patterns by a photo-generated acid.
26
Ferreira, Ricardo Xavier da Graça. "Gallium nitride light-emitting diode enabled visible light communications." Thesis, University of Strathclyde, 2017. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=28805.
Анотація:
This thesis focuses on the development, measurement and application of novel micrometre-sized light emitting diodes (micro-LEDs) based on Gallium Nitride (GaN) for visible light communications (VLC) in both free-space and guided wave configurations. The goal is to set benchmarks for LED-based wireless optical communications. An overview of the field integrating research, industry and standards is presented. A top-down approach is taken with application requirements driving development of new micro-LEDs with simultaneously increased optical power and modulation bandwidth. This was achieved by mitigating two limitations, namely current crowding and mutual device heating. Two novel techniques were developed to access pixel performance: spatially-resolved mapping of modulation bandwidth and spectral characteristics, and thermal imaging. On this basis, broad-area LEDs were used to understand the independent benefits, providing insight for the design of novel micro-LEDs. Circular segmented micro-LEDs emitting at 450nm achieved modulation bandwidths in excess of 800MHz, the highest reported for LEDs, while maintaining optical power above 2mW. In data transmission using systems with 1.8GHz bandwidth,the devices achieved 8Gbps in free-space and guided-wave operation at wavelengths of 400nm, 450nm and 520nm. Ring and half-ring micro-LEDs introduced here have shown modulation bandwidths that scale with the increase of active area and consequently optical power. Bandwidths in excess of of 600MHz were achieved at optical powers over 5mW. In data transmission using a system limited to 1GHz bandwidth, these devices achieved 7Gbps in free-space operation.
27
Riskin, Seth. "Light Dance : light and the nature of body movement." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/46405.
Анотація:
Thesis (M.S.V.S.)--Massachusetts Institute of Technology, Dept. of Architecture, 1989.Includes bibliographical references (leaves 37-39).
Light Dance is a conscious transfiguration of the body, its movement and the encompassing space; a transposition of matter to light exalted in the dance. This corresponds to the conceptualized spirit of the performer whose body is "consumed" by light. A transposition occurs between the performer and audience. The audience experiences the dissolution of the body into light. In this thesis I assemble fragments of visible and inner light experiences and concepts of the body by an intuition of the spirit . The purpose is to equate visible and inner light. The writing is based on light as the physical self of the spirit; the significance of the body and movement. Specific examples are cited to create a contextual fabric for the inspired design of Light Dance.
by Seth Riskin.
M.S.V.S.
28
De, Valpine John E. "Representations of light in design : light, computation and praxis." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/65697.
Анотація:
Thesis (M. Arch.)--Massachusetts Institute of Technology, Dept. of Architecture, 1996.Includes bibliographical references (p. 123).
Sophisticated computational tools for accurately representing both natural and artificial light are now available. These tools may serve to facilitate the designer's ability to understand the fundamental spatial and architectural experiences in a given design proposition. This thesis seeks to enunciate a design praxis that utilizes computer visualization as the primary exploratory method for understanding the relations of light to form. The design of a small library in Boston serves as the grounds for developing a critical understanding of such a design praxis. The library type provides a wide variety of circumstances demanding the control of light as well as a rich set of precedents in which the use of light is paramount to the spatial experience. Within the scope of the design problem, this thesis seeks to articulate a critical understanding of how design process may be facilitated by computational methods of exploration and representation. In particular it explores the relations of light to form in architectural design, and how decisions of space and form may be made based upon the desired qualities and effects of light.
by John E. de Valpine.
M.Arch.
29
KARLÉRUS, MIKAELA, and BEATA TÖRNEMAN. "Light Tracking Robot : Navigation using light and colour sensors." Thesis, KTH, Maskinkonstruktion (Inst.), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-191208.
Анотація:
The increasing demand of making the roads safer has trigged a lot of companies to develop complete self-driving cars. A self-driving car requires a great number of different sensors as gyros, radars, GPS, tachymeters etc. and advanced software. This thesis will focus on the possibilities of using only light sensing devices for a tracking robot and examine the advantages and disadvantages of this. The purpose is to investigate which type of light sensor is more suitable for a tracking robot and what the limitations of a tracking robot using this technology are. A demonstrator using two light sensors for controlling speed and direction and a colour sensor to avoid obstacles will be built. Apart from choosing the most suitable sensor for a light-tracking robot the sensing distance and range of the chosen one will be tested. To investigate the different light-tracking possibilities and the accuracy of the demonstrator, the vehicle will be put in an open indoor space with arranged coloured luminous obstacles. The robot will be tested in both a completely dark room and a lit room. The intention with the outcome is to see the differences of the robots behaviour when disturbances from surrounding light are added as an additional aspect. The results from the test are presented and the use of different sensors are discussed. The final conclusion on using light sensing for a tracking robot is that it is an easy and inexpensive method, but it should be used as a complement to other sensing devices not as a stand-alone method.Den ökande efterfrågan på säkra bilvägar har lett till en utveckling av kompletta självkörande bilar. En självkörande bil kräver ett stort antal olika sensorer som gyros, GPS, tachymeter osv. samt avancerad programvara. Denna avhandling kommer fokusera på möjligheterna att konstruera en spårningsrobot med bara ljuskännande enheter samt undersöka fördelar och nackdelar med detta. Syftet är att avgöra vilken typ av ljussensor som lämpar sig bäst för en spårningsrobot och vilka begränsningar en spårningsrobot som använder denna teknologi kommer att ha. En prototyp som använder två ljussensorer för kontrollerande av hastighet och riktning samt en färgsensor för att undvika hinder kommer att konstrueras. Bortsett från att välja den mest lämpade sensorn för en spårningsrobot, kommer avståndskänning och räckningsvidd att testat för den valda sensorn. Roboten kommer att testas i både ett fullständigt mörkt rum och i ett upplyst rum. För att undersöka de olika ljusavkännings alternativen och noggrannheten hos roboten, kommer fordonet att placeras inomhus på ett öppet område med färgade ljuskällor arrangerade som hinder. Avsikten är att se skillnaderna i robotens beteende när störningar såsom reflektioner och olika ljuskällor i omgivningen tillkommer. Resultatet från testerna kommer att presenteras och användningen av olika sensorer kommer att diskuteras. Slutsatsen är att det är en enkel och billig metod att använda ljusavkänning för en spårningsrobot men att det framförallt bör användas som ett komplement till andra avkänningsanordningar och inte som en fristående metod.
30
Atthipalli, Gowtam. "Light Scattering by Colloids Larger than Wavelength of Light." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1185471826.
31
Sangal, Maitreyi [Verfasser], and Christoph H. [Akademischer Betreuer] Keitel. "The interaction of Light with Matter and Light with Light / Maitreyi Sangal ; Betreuer: Christoph H. Keitel." Heidelberg : Universitätsbibliothek Heidelberg, 2021. http://d-nb.info/1228700710/34.
32
Ridha, Hashem M. "The effect of using variable curing light types and intensities on the parameters of a mathematical model that predicts the depth of the cure of light-activated dental composites." Connect to resource online, 2009. http://hdl.handle.net/1805/2082.
Анотація:
Thesis (M.S.D.)--Indiana University School of Dentistry, 2009.Title from PDF t.p. (viewed Feb. 5, 2010) Advisor(s): John A. Levon, Chair of the Research Committee, Carl J. Andres, Tien-Min Gabriel Chu, David Brown, Suteera Hovijitra. Curriculum vitae. Includes abstract. Includes bibliographical references (leaves 66-69).
33
Blockley, Craig Andrew. "Quantum interactions of light and atoms: squeezing of light by atoms and cooling of atoms by light." Thesis, University of Auckland, 1993. http://hdl.handle.net/2292/1966.
Анотація:
Light and atoms couple together via the electromagnetic interaction. The simplest form of this interaction is the electric dipole interaction, and in its quantised form it provides a useful starting point for the investigation of quantum effects in optics. Two examples of quantum noise manipulation of the light field due to interaction with atoms will be presented, as well as an analysis of a simple model for laser cooling of trapped atoms. The first example of quantum noise manipulation is the investigation of a quantum non-demolition measurement scheme based on a three-level atomic system in the ladder configuration. An effective two-level model of the atomic system is used, which enables the inclusion of spontaneous emission noise from the upper atomic level. The system is found to perform well, when detuned far from resonance. The second example is the treatment of squeezing in the intensity difference between two modes coupled by a three-level atomic system in the ladder configuration. The noise correlations are similar to those occurring in the optical parametric oscillator, and give rise to good squeezing when the system is well detuned from the intermediate level. The simple model of laser cooling consists of a single two-level atom with quantised centre-of-mass motion constrained to move in a one-dimensional harmonic potential while interacting with a single-mode classical travelling light field. It is shown that there is an analogy between this model and the Jaynes-Cummings model. This gives rise to interesting coherent effects including quantum collapses and revivals in the atomic inversion. Sideband cooling occurs for this model when the light field is tuned to the atom's first lower vibrational sideband. The strong sideband and Lamb-Dicke perturbation regimes are defined. Analytic results have previously been obtained for the latter regime, but we carry out a numerical investigation of the steady state and time evolution behaviour in the former regime. Differences in the behaviour in the two regimes are discussed. Finally the possibility of observing quantum jumps between trap levels is discussed.
34
Watanabe, Shohei. "Subsurface light conditions and light attenuation mechanisms in Missouri reservoirs /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p1426113.
35
Hayakawa, M., T. Kinoshita, and A. I. Sanda. "Hadronic Light-by-Light Scattering Effect on Muon g -2." The American Physical Society, 1995. http://hdl.handle.net/2237/7156.
36
Hayakawa, M., T. Kinoshita, and A. I. Sanda. "Hadronic light-by-light scattering contribution to muon g-2." The American Physical Society, 1996. http://hdl.handle.net/2237/7136.
37
Chen, Yun. "Using micro - structures to couple light into thin light - guides." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-50874.
Анотація:
The task of this project is to investigate the possibilities of using micro-structuring on the surface of thin light-guides to efficiently couple light from top-emitting LEDs into such light-guides. Areas of application are backlighting for LCD TV and flexible light emitting layers for lighting purposes. The micro-structures considered are prisms and pyramids. The micro-structures can be on the same side of light-guide as the LEDs or on the opposite side. When located on the opposite side, the micro-structures are coated with a specular reflecting layer or with a diffuse reflecting layer. The LEDs can either be in optical contact with the light-guide or not in optical contact. Optical ray-tracing software package Light-Tools is used for all ray-tracing simulations of these geometries. In simulations, a two-step approach is taken: Firstly, we build in Light-Tools a simple model of an LED in proximity to a micro-structured light-guide in order to ascertain which geometry is most likely to show a high in-coupling efficiency. In the next step, we made a more elaborate and more accurate model of the most promising geometries. The results of these simulations show that, for micro-structures that are located on the light-guide on the side opposite to the LEDs, a diffuse reflecting layer (i.e. a Lambertian scatterer) is more useful than a specular reflecting layer (i.e. a mirror). Also, in general, the prisms structures perform better than the pyramid structures. The highest efficiency reached in the simulations is 60% for Model I1 in which the light source is not in optical contact with the light guide and the mirror is on the opposite side of the light guide. Compared to the result reported in a previous paper, the incoupling efficiency improvement is 8%. We also looked into using Retro-reflection Films for improving the in-coupling efficiency. Several prototypes with a Retro-reflection Film were made and tested in the laboratory. Measurements were performed for three thicknesses of the light guide: 0.25 mm, 0.5 mm and 1 mm. The best in-coupling efficiencies measured are 37% for a 0.25 mm thick light guide, 53.1% for a 0.5 mm thick light guide and 57.1% for a 1 mm thick light guide. Compared to the samples without Retro-reflection Film, the best Retro-reflection Film results in a 7% increase for the 0.25 mm thick light guide, 6.2% increase for the 0.5 mm case and 2.8% increase for the 1 mm case, respectively.
38
Hahne, Gadd Jenny. "Layered Light : Exploring dynamic light patterns with textile as medium." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-8923.
Анотація:
Layered light is a textile design project aiming to explore light as a design variable and its abilities to - in combination with layers of laser cut textiles - create dynamic patterns. The reason being to explore how light can be used to create the very pattern itself and what the textile quality can bring to the expression. Through a practice based working method, laser cutting has been used to manipulate different textile materials, that in combination with movement have resulted in range of design examples displaying various effects of the technique. Three of the found effects have been used to take forth a collection of patterns drawing inspiration from the elusive beauty of light in nature. One of which has been produced in a larger scale, exemplifying how the expression could be used in a spacial context. The result implicates the usefulness of integrating light early on in a design process and how textile and light can be combined to enhance each other all well as displaying a whole new expression for laser cut textiles.
39
Graham, Katherine Joy. "Scenographic light : towards an understanding of expressive light in performance." Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/20414/.
Анотація:
In the expanded field of performance design research there is a growing understanding of the dynamic and affective capacities of performance materials, and how such materials may play a fundamental role in the audience experience of a given performance. Parallel to this research in scenography is a similar extension of the conception of the roles of light and dark in performance. Reconciling and extending these areas of research this PhD thesis posits the term ‘scenographic light’ to encapsulate the ability of performance light to actively inscribe dramaturgical meaning in space and time, arguing that light is capable of independently contributing to performance through its manipulation of space, time, and visuality. This doctoral research uses auto-ethnographic spectatorship as a means of identifying the unique contribution of light to performance. Employing a phenomenological framework to explore the dynamic role of light within performance, this study presents an ontology of light that is rooted in dramaturgical action. The experiential framework put forward in this research facilitates a theoretical discussion about the dramaturgical impact of light, revolving specifically around questions of how light affects other elements in performance, how it seems to perform as a material in itself, and how, in respect of these things, it can become a generative force in performance. By applying these questions to a wide range of contemporary performance practices I identify and articulate ways in which light can be considered a significant contributor to performance, working simultaneously with, but independently of, other elements in performance. The implications of this research invite an expanded view of the position of light in performance analysis, and suggest that the study of light may be productively aligned with explorations of audience engagement and affect.
40
Chanyawadee, Soontorn. "Resonant energy transfer in light harvesting and light emitting applications." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/72508/.
Анотація:
The performance of light emitting and light harvesting devices is improved by utilising resonant energy transfer. In lighting applications, the emission energy of a semiconductor heterostructure and the absorption of organic dyes or colloidal quantum dots (QDs) are engineered so that the excitations in the semiconductor heterostructure can be transferred to the light emitters by means of resonant energy transfer. The emitters subsequently emit colour-tunable light ranging from the visible to the near-infrared. As a result, a twofold enhancement of QD emission is demonstrated in a hybrid QD/semiconductor heterostructure. In light harvesting applications, a hybrid structure of colloidal QDs and a quantum well (QW) p-i-n heterostructure is investigated. After highly absorbing QDs absorb photons, the excitations are efficiently transferred to a QW p-i-n heterostructure via resonant energy transfer. The generated electron-hole pairs in the heterostructure are subsequently separated by the built-in electric held and collected by the corresponding electrodes. In order to increase the energy transfer rate, the donor-acceptor separation distance is minimised by fabricating channel structures on the heterostructure surface penetrating its active layers. Consequently, a sixfold enhancement of photocurrent conversion efficiency is demonstrated. Photocurrent of the hybrid structure is further improved by replacing the QW heterostructure with a bulk p-i-n heterostructure which has higher carrier transport efficiency. Hence, the photocurrent of the hybrid bulk heterostructure is about two orders of magnitude higher than that of the hybrid QW heterostructure. The proposed hybrid structures offer efficient light harvesting devices where high absorption of the colloidal QDs is utilised and their low charge transfer is overcome.
41
Schippers, John. "Sentenced by Light: An Architectural Study of Light and Time." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/32697.
42
Mojtahedi, Mahsa. "PATCHES OF LIGHT, A LUMINAIRE WITH USER ADJUSTABLE LIGHT DISTRIBUTION." Thesis, KTH, Ljusdesign, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-297955.
Анотація:
This Master’s thesis is to delineate a luminaire design which has a flexible functional form, can be controlled by the user, and which creates multidirectional light distribution within an indoor space. A lighting solution with varied light distributions can change a space’s different spatial experiences, granting a flexibility which is controlled by the user to direct light rays into walls, floors, ceilings or to create variations of these. A flexible luminaire in terms of light distribution allows, vertical and horizontal surfaces to be valued equally, because through a minimal intervention it is possible to shift the focus from one surface to another, providing a holistic interplay in space. The participants, who took part in the evaluation program of the final luminaire, freely introduced their possible activities in the predefined dining room, with different lighting proposals according to personal preferences of spatial experience. The designed luminaire was the only accessible tool to influence the space, and they managed to achieve their ideal atmospheres, and experiences, by the process of adjusting the luminaire with controlled light distribution. The varied results of the patterns of brightness and darkness on the vertical and horizontal surfaces in the predefined real space, prove the flexibility of the final design of the luminaire, MM Lamp. The luminaire fulfills the predefined design objectives of being user adjustable as well as creating varied light distribution.
43
Olson, Carl Scott. "Safety Effectiveness of Red Light Treatments for Red Light Running." PDXScholar, 2012. https://pdxscholar.library.pdx.edu/open_access_etds/882.
Анотація:
Crashes resulting from automobiles running a red light are typically severe in nature. One way to try to reduce the number and severity of these types of crashes is by increasing the red clearance interval of a traffic signal. In Portland, Oregon, eight intersections received a variety of treatments including red extensions. Determining which treatment had what effect can be difficult to weed out. Using a combination of crash analysis and a model simulating an intersection with red extensions, this paper describes the estimated impact of red light running intersection upgrades and red extensions on crashes. By performing a variety of before and after crash analysis, a reduction of angle crashes after treatments was detected, with a crash modification factor of 0.64 +/- 0.28 using the Empirical-Bayes method. Output from the simple simulation also suggest that red light running crashes can be reduced with red extension technology and confirms crash modification values determined from the Empirical-Bayes method.
44
Chen, Xi. "Noble metal photocatalysts under visible light and UV light irradiation." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/47008/1/Xi_Chen_Thesis.pdf.
Анотація:
One of the greatest challenges for the study of photocatalysts is to devise new catalysts that possess high activity under visible light illumination. This would allow the use of an abundant and green energy source, sunlight, to drive chemical reactions. Gold nanoparticles strongly absorb both visible light and UV light. It is therefore possible to drive chemical reactions utilising a significant fraction of full sunlight spectrum. Here we prepared gold nanoparticles supported on various oxide powders, and reported a new finding that gold nanoparticles on oxide supports exhibit significant activity for the oxidation of formaldehyde and methanol in the air at ambient temperature, when illuminated with visible light. We suggested that visible light can greatly enhance local electromagnetic fields and heat gold nanoparticles due to surface plasmon resonance effect which provides activation energy for the oxidation of organic molecules. Moreover, the nature of the oxide support has an important influence on the activity of the gold nanoparticles. The finding reveals the possibility to drive chemical reactions with sunlight on gold nanoparticles at ambient temperature, highlighting a new direction for research on visible light photocatalysts. Gold nanoparticles supported on oxides also exhibit significant dye oxidation activity under visible light irradiation in aqueous solution at ambient temperature. Turnover frequencies of the supported gold nanoparticles for the dye degradation are much higher than titania based photocatalysts under both visible and UV light. These gold photocatalysts can also catalyse phenol degradation as well as selective oxidation of benzyl alcohol under UV light. The reaction mechanism for these photocatalytic oxidations was studied. Gold nanoparticles exhibit photocatalytic activity due to visible light heating gold electrons in 6sp band, while the UV absorption results in electron holes in gold 5d band to oxidise organic molecules. Silver nanoparticles also exhibit considerable visible light and UV light absorption due to surface plasmon resonance effect and the interband transition of 4d electrons to the 5sp band, respectively. Therefore, silver nanoparticles are potentially photocatalysts that utilise the solar spectrum effectively. Here we reported that silver nanoparticles at room temperature can be used to drive chemical reactions when illuminated with light throughout the solar spectrum. The significant activities for dye degradation by silver nanoparticles on oxide supports are even better than those by semiconductor photocatalysts. Moreover, silver photocatalysts also can degrade phenol and drive the oxidation of benzyl alcohol to benzaldehyde under UV light. We suggested that surface plasmon resonance effect and interband transition of silver nanoparticles can activate organic molecule oxidations under light illumination.
45
Henry, Sabina I. "Light of Life." VCU Scholars Compass, 2006. http://hdl.handle.net/10156/1644.
46
Steigleder, Mauro. "Pencil Light Transport." Thesis, University of Waterloo, 2005. http://hdl.handle.net/10012/1150.
Анотація:
Global illumination is an important area of computer graphics, having direct applications in architectural visualization, lighting design and entertainment. Indirect illumination effects such as soft shadows, color bleeding, caustics and glossy reflections provide essential visual information about the interaction of different regions of the environment. Global illumination is a research area that deals with these illumination effects. Interactivity is also a desirable feature for many computer graphics applications, especially with unrestricted manipulation of the environment and lighting conditions. However, the design of methods that can handle both unrestricted interactivity and global illumination effects on environments of reasonable complexity is still an open challenge. We present a new formulation of the light transport equation, called pencil light transport, that makes progress towards this goal by exploiting graphics hardware rendering features. The proposed method performs the transport of radiance over a scene using sets of pencils. A pencil object consists of a center of projection and some associated directional data. We show that performing the radiance transport using pencils is suitable for implementation on current graphics hardware. The new algorithm exploits optimized operations available in the graphics hardware architecture, such as pinhole camera rendering of opaque triangles and texture mapping. We show how the light transport equation can be reformulated as a sequence of light transports between pencils and define a new light transport operator, called the pencil light transport operator, that is used to transfer radiance between sets of pencils.
47
Mark, Philip. "Ethernet over light." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/51772.
Анотація:
The advent of high-brightness, fast-switching Light Emitting Diodes (LEDs) has facilitated Visible Light Communication (VLC) as a new form of Optical Wireless Communication (OWC) over the visible light spectrum. In VLC, these LEDs serve a dual purpose of communication on top of general illumination. The biggest challenge facing VLC lies in finding the “killer application" that will propel the technology to widespread adoption. One of the ways we believe this can be achieved is by integrating VLC with pre-existing Ethernet Local Area Network (LAN) backbones. Although there has been some preliminary research in this area, specifically involving 10Base-T over VLC, none have explicitly dealt with Fast Ethernet (100 Mbps) over VLC. In this thesis, we investigate the implementation of analog transmission of 100Base-TX over VLC in an amplify-and-forward approach, which we coin as Ethernet-over-Light (EoL). We present the design of a VLC transmitter and accompanying receiver developed for EoL, and include a comprehensive channel model to analyze this Ethernet-VLC link. Equalization techniques were explored to overcome the various shortcomings associated with the EoL channel, and to improve the performance of the overall system. This VLC-LAN solution proved to be a viable alternative for providing a wireless broadcast link wherever LEDs would be deployed for illumination in an indoor setting.Applied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
48
Schmidt, Douglas Garth. "Eyes without light." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/32243.
Анотація:
"Eyes Without Light" is conceived and scored for symphonic orchestra. The title of this work reflects personal concerns regarding global environmental issues. The phrase "eyes without light", derived from the Gaelic term "sul gan solas", refers in this instance to the blind greed of multi-national industrial and political corporations which are responsible for the destruction of the earth's ecosystem (primarily the forests and oceans).
This work, influenced by the 19th-century symphonic poem initiated by Beethoven, Berlioz and Liszt, is programmatic in nature. The busy, confrontational destructiveness of mankind is represented by repeated or moving sixteenth notes at the beginning and end of the piece. These sections utilize varying densities of semitone clusters and are predominantly dissonant. The calmness and balance of the planet earth is represented by the middle section of the work, which consists primarily of slow-moving sustained lines. These sustained lines move to a sonority which is the structural focal point of the work (m 129-131). This sonority is resolved in the final measures. Both the focal point sonority and its resolution are constructed of P5 and P4 intervals. The aggressive destructiveness of mankind is emphasized by the repeated dissonant chords in the concluding measures (m 140-147, m 151-157) of the section.Arts, Faculty of
Music, School of
Graduate
49
Marais, Shirley. "Slanting the light." Thesis, Rhodes University, 2018. http://hdl.handle.net/10962/63558.
Анотація:
Through my poetry I attempt to make sense of my encounters with myself by bringing to creative expression my experiences of and felt responses to people, places and situations. Among the poets who have had a significant influence on my work are Robert Berold, for his quiet assertion of intense, dramatic images; Frank O’Hara for his disciplined sense of mischief; Joan Metelerkamp for her meticulous attention to form and the way she makes a poem breathe; Robert Creeley for his ability to create free-floating meaning; and Mangaliso Buzani, for his fierce, honest poetics.
50
Lincoln, Lucy, and lucy lincoln@bigpond com. "Light and Illusion." RMIT University. Art, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20090306.145318.
Анотація:
This project is an investigation of visual illusions created through the interaction of light on different surfaces and structures. Illusion implies deception - an optical illusion, in a sense is misunderstood information that creates a 'false' visual reality. This project incorporates macro and non-macro photography to generate illusion through scale and shape. Through deliberate acts of deception the images play on the human desire for mystery. It is through the 'eye of the imagination' that the images reveal themselves. The photographic images are of dioramas created on the top of a light box, using everyday substances and materials such as glass, felt, coloured transparencies, detergents and liquids of varying consistencies. This project reveals the extraordinary in the ordinary. The outcome of this project is a photographic body of work, the product of my experimentation and research, in which the ambiguous content of the composition, compels the viewer to their own interpretation. Translating some of the resulting images into a three-dimensional light based installation of an illusory nature invites people to take on a participatory role, furthering their experience with the artwork. This project makes us aware of our role within the experiential process, ma king us appreciate and question its very nature.