Dissertations / Theses on the topic 'Sound, light and Heat'
To see the other types of publications on this topic, follow the link: Sound, light and Heat.
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Sound, light and Heat.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Tang, Hsin-Yi. "Changes on physiologic and cognitive functioning through light/sound stimulation in older adults : a mind/body connection /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/7216.
Full text
2
Hart, Charles J. "Architecture of light and sound." Thesis, This resource online, 1997. http://scholar.lib.vt.edu/theses/available/etd-09092008-063818/.
Full text
3
Dai, Hin Man. "Light weight low frequency sound focus lens /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202005%20DAI.
Full text
4
Giddens, Eric M. "Geoacoustic inversions using sound from light aircraft /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2005. http://wwwlib.umi.com/cr/ucsd/fullcit?p3171115.
Full text
5
Menchon, Enrich Ricard. "Spatial adiabatic passage: light, sound and matter waves." Doctoral thesis, Universitat Autònoma de Barcelona, 2013. http://hdl.handle.net/10803/129476.
Full textAbstract:
El naixement de la Mecànica Quàntica va proporcionar el marc teòric que permetia poder explicar fenòmens prèviament observats experimentalment, com ara la radiació del cos negre, l'efecte fotoelèctric o les línies espectrals de gasos atòmics, i també va permetre entendre millor aspectes fonamentals relacionats amb la dualitat ona-partícula i la interacció entre radiació i matèria. La Mecànica Quàntica ha estat també l'origen de disciplines més específiques com l'Òptica Quàntica o la Informació Quàntica, les quals s’ocupen parcialment del que es coneix com Enginyeria Quàntica.
En aquest context, s'han proposat processos de passatge adiabàtic, que consisteixen en el seguiment adiabàtic d'un estat propi del sistema, i que permeten un control molt robust i eficient de la transferència de població entre dos estats assimptòtics. Com molts altres processos en Mecànica Quàntica, els processos de passatge adiabàtic són purament oscil•latoris i poden ser considerats en altres sistemes físics no quàntics que suportin quantitats oscil•lants. En aquesta tesi, s'analitzen processos de passatge adiabàtic en diferents sistemes físics per a controlar la propagació de llum, so i ones de matèria en sistemes de guies acoblades, i la transferència d'àtoms freds individuals en trampes de potencial harmòniques. Adicionalment, utilitzem la robustesa i l'alta eficiència del passatge adiabàtic per proposar nous dispositius i discutir noves implementacions en aquests diversos camps.
Específicament, demostrem experimentalment el passatge espacial adiabàtic de llum en un sistema de tres guies TIR d'òxid de silici compatibles-CMOS acoblades mitjançant el camp evanescent, que consisteix en una transferència completa d'intensitat de llum entre les guies externes del sistema. L'avantatge d'usar el passatge espacial adiabàtic respecte els acobladors direccionals estàndard és que la transferència de llum és robusta enfront de fluctuacions tecnològiques i no depèn de valors precisos dels paràmetres. Aquest és el primer dispositiu de passatge espacial adiabàtic per llum fabricat amb tecnologia compatible-CMOS, el que permet una integració massiva i de baix cost. A més, també demostrem experimentalment que aquest sistema de guies es comporta simultàniament com a filtre passa alts i passa baixos, amb unes característiques que el fan una alternativa a altres tipus de filtres integrables com filtres basats en interferència o en absorció.
Adicionalment, adrecem el passatge espacial adiabàtic d'ones sonores en sistemes de dos defectes lineals acoblats en cristalls sònics. Calculant els diagrames de bandes per analitzar els supermodes del sistema disponibles i modificant apropiadament la geometria dels defectes lineals al llarg de la propagació, dissenyem dispositius que funcionen com a divisors i acobladors adiabàtics mutifreqüència i com a analitzadors de diferència de fase.
També, proposem un mètode per injectar, extreure i filtrar en velocitat àtoms neutres en trampes en forma d'anell mitjançant el passatge espacial adiabàtic utilitzant dues guies addicionals. La proposta es basa en el seguiment adiabàtic d’un estat propi transversal del sistema. Realitzem càlculs semianalítics que encaixen perfectament amb els resultats de simulacions numèriques de l'equació de Schrödinger. També mostrem que la nostra proposta podria ser implementada experimentalment utilitzant paràmetres realistes d'àtoms ultrafreds en potencials òptics dipolars.
Finalment, estudiem el passatge adiabàtic d'un àtom fred individual en un triple pou de potencial bidimensional, anant més enllà dels sistemes coneguts, que són de manera efectiva unidimensionals i estudiant les possibilitats que sorgeixen dels graus de llibertat addicionals. D'una banda, un sistema de tres pous de potencial amb les trampes en una geometria triangular es proposa per a interferometria d'ones de matèria, aprofitant un creuament de nivells que apareix en l'espectre d'energia. D'altra banda, es genera moment angular satisfactòriament en una configuració similar on les trampes tenen freqüències d'atrapament diferents, seguint simultàniament dos estats propis del sistema.The birth of Quantum Mechanics provided a theoretical framework that could explain some previously experimentally reported phenomena, such as the black body radiation, the photoelectric effect or the spectral lines of atomic gases, and also allowed for a better understanding of fundamental aspects related to the wave-particle duality and the interaction between radiation and matter. Quantum Mechanics has been also the origin of more specific disciplines such as Quantum Optics or Quantum Information science, which are partially devoted to a more applied research field that is known as Quantum Engineering. In this context, adiabatic passage processes consisting in the adiabatic following of an eigenstate of the system, which allows for a very robust and efficient control of the population transfer between two asymptotic states have been proposed. As many other processes in Quantum Mechanics, adiabatic passage processes are purely oscillatory and can be extended to other non-quantum physical systems, which also support oscillating quantities. In this thesis, spatial adiabatic passage processes are addressed in different oscillatory physical systems to control light, sound and matter waves propagation in systems of coupled waveguides, and the transfer of single cold atoms in harmonic potentials. Additionally, we make use of the robustness and high efficiency of the adiabatic passage to propose new devices and discuss new implementations in these various fields. To be specific, we experimentally demonstrate the spatial adiabatic passage of light in a system of three evanescent-coupled CMOS-compatible silicon oxide TIR waveguides, which consists in a complete transfer of light intensity between the outermost waveguides of the system. The advantage of using spatial adiabatic passage compared to standard directional couplers is that the light transfer is robust in front of technological fluctuations and does not depend on precise parameter values. Additionally, this is the first spatial adiabatic passage of light device fabricated in CMOS-compatible technology, which allows for massive and low cost integration. Furthermore, we also experimentally show that this system of coupled waveguides behaves as a simultaneously low- and high-pass spectral filter, with features that makes it an alternative to other integrated filters like interferenceñbased and absorbance-based filters. In addition, we address the spatial adiabatic passage of sound waves in systems of two coupled linear defects in sonic crystals. By calculating the band diagrams to analyze the available supermodes of the system and modifying the geometry of the linear defects along the propagation distance appropriately, we design devices working as a multifrequency adiabatic splitter, as a coupler and also as a phase difference analyser. Furthermore, we discuss a novel method to inject, extract and velocity filter neutral atoms in a ring trap via a spatial adiabatic passage process by using two extra waveguides. The proposal is based on the adiabatic following of a transversal eigenstate of the system. Semianalytical calculations are performed, which perfectly match with the results of the numerical integration of the Schrˆdinger equation. We also show that our proposal could be experimentally implemented for realistic state-of-the-art parameters of ultracold atoms in optical dipole potentials. Finally, we study the spatial adiabatic passage of a single cold atom in two-dimensional triple-well potentials, going beyond the well-understood effective one-dimensional systems and studying the possibilities arising from the additional degrees of freedom. On the one hand, a system of three coupled identical harmonic potentials with the traps lying in a triangular configuration is proposed for matter wave interferometry taking profit of a level crossing appearing in the energy spectrum. On the other hand, angular momentum is successfully generated in a similar configuration where the three harmonic traps have different trapping frequencies by simultaneously following two eigenstates of the system.
6
Woodbury, Patricia Powell. "Students with autism: A light/sound technology intervention." W&M ScholarWorks, 1996. https://scholarworks.wm.edu/etd/1539618724.
Full textAbstract:
The purpose of the study was to investigate the effectiveness of light/sound technology to promote sensory integration which facilitates the learning capacity of children with autism by reducing their high state of arousal, increasing time on task and decreasing acting-out behaviors. This research extended the work of A. Jean Ayres and Lorna King who theorized that the autistic individual's brain does not register, modulate or integrate sensations that most people notice; auditory and visual inputs are ignored more than other types of sensory stimuli. This study utilized light/sound technology to stimulate and desensitize these sensory channels to facilitate processing of incoming stimuli. The technology was furnished by Dr. Harold Russell and was programmed with a microchip to control the frequency patterns. Twelve subjects were selected to participate in this eight week study; only five subjects completed. They represented schools in the Tidewater region of Virginia and Illinois. Inattention, Impulsivity, and Hyperactivity were assessed with The Attention Deficit Disorder Evaluation Scale-Home and School Versions. Comparison of the results of these measures and qualitative data were incorporated into case studies. There was improvement noted in social skills, attention and on-task behavior. The results are supportive of research conducted with learning disabled and AH/HD students conducted by Drs. Carter and Russell.
7
Hedfors, Per. "Site soundscapes : landscape architecture in the light of sound /." Uppsala : Dept. of Landscape Planning Ultuna, Swedish Univ. of Agricultural Sciences, 2003. http://epsilon.slu.se/a407.pdf.
Full text
8
Hussaini, Muzhgan. "Luminous Land of Phon." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/91402.
Full textAbstract:
This thesis, Luminous Land of Phon, explores how architectural spaces, even interior spaces, interact with nature along different dimensions. Light and sound are the two very powerful elements of nature and are the focus of this study. Louis Kahn once said: "The sun does not realize how wonderful it is until after a room is made." (Source: https://www.quotetab.com/quotes/by-louis-kahn#GdaYdAIrZ8tmvcyh.97)
The question of nature is explored in an urban environment to challenge the tired dualistic division between the human and the natural world. This project transforms the way we think about the urban so that architecture and nature can have great harmony and elevate each other instead of canceling each other. The project is a school of architecture and landscape architecture that promotes fine spaces with desirable qualities of light and sound for the design professionals of the future. The project is sited in the University of the District of Columbia as an expansion of their existing campus and programs.Master of Architecture
The architecture is a school of Architecture and Landscape architecture consisting of a full scale natural water pool underneath the building, Gallery and shop space under the pool, studio spaces, class rooms, faculty offices, cafeteria, and ceremony halls for the University of the District of Columbia at its Van Ness Campus sited at the Connecticut Ave, NW Washington D.C. The thesis is an exploration of the concept of bringing nature into architecture and a formal study of their harmony with each other, Architecture, structure and construction of the building.
9
Csinos, David M. "Light Art, Street Art, and the Art of Preaching: Sound-and-Light Shows as Public Proclamation." Universität Leipzig, 2020. https://ul.qucosa.de/id/qucosa%3A72283.
Full textAbstract:
This article examines how the phenomenon of sound-and-light shows fulfills the purposes of preaching and, as such, can be perceived as a form of public proclamation. Originating in France but now offered all over the world, these shows use large-scale video projection to display images on the facades of historic buildings, many of which are religious in nature, set to sound effects and music. The author begins by addressing three purposes of preaching that arise within homiletical discourse: testimony of God’s story, empowering transformation, and engendering encounters with God. Drawing from recent qualitative research into spectators’ experiences at sound-and-light shows, the author then examines how three specific shows serve as case studies that demonstrate that, while not sermons, they can indeed fulfill each of the purposes of preaching. As such, these spectacles can be seen as a vibrant form of proclamation amidst contemporary public settings.
10
Thompson, Andrew. "Light Sensitive." CSUSB ScholarWorks, 2015. https://scholarworks.lib.csusb.edu/etd/245.
Full textAbstract:
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.
11
Ville, Jean-Loup. "Quantum gases in box potentials : sound and light in bosonic Flatland." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEE024/document.
Full textAbstract:
Les atomes ultrafroids constituent depuis une vingtaine d’années un domaine fructueux pour l’étude de la physique à N corps. Cependant l’inhomogénéité des nuages atomiques, induite par les méthodes de piégeage utilisées habituellement, constitue une limite pour les études portant sur de grandes échelles de longueur. Nous reportons ici la mise en place d’un nouveau dispositif expérimental, combinant un potentiel modulable à bords raides et fond plat dans le plan atomique, avec un confinement versatile dans la troisième direction. Nous nous intéressons à différentes excitations du système, premièrement des degrés de liberté internes des atomes via leur interaction avec la lumière, puis deuxièmement de leur mouvement collectif avec la propagation de phonons. La répartition des atomes dans un plan est particulièrement adaptée aux études de diffusion de la lumière. Elle permet en effet de sonder de fortes densités atomiques, entraînant de fortes interactions dipôle-dipôle induites, tout en gardant un signal transmis suffisant pour effectuer des mesures. Nous avons mesuré la déviation au comportement d’un atome isolé pour de la lumière proche de résonance lorsque la densité atomique est modifiée. Nous avons également étudié la diffusion de photons dans un disque d’atomes en injectant de la lumière seulement au centre du disque. Nous nous sommes ensuite intéressés aux excitations collectives du gaz. Nous avons mesuré la vitesse du son dans le milieu, qui est liée à la fraction superfluide du système, et comparé nos résultats aux prédictions d’un modèle hydrodynamique à deux fluides. En utilisant une géométrie adaptée, nous avons en outre étudié la dynamique de retour à l’équilibre d’un système isolé, en imageant la phase du condensat de Bose-Einstein résultant de la fusion de jusqu’à douze condensatsUltracold atoms have proven to be a powerful platform for studying many-body physics. However the inhomegeneity of atomic clouds induced by potentials commonly used to trap the atoms constitutes a limitation for studies probing large length scales. Here we present the implementation of a new versatile setup to study two-dimensional Bose gases, combining a tunable in-plane box potential with a strong and efficient confinement along the third direction. We study different excitations of the system, either of internal degrees of freedom of the atoms with light scattering, or of their collective motion with phonon propagation. The slab geometry is particularly well suited for light scattering studies. It allows one to probe high atomic densities, leading to strong induced dipole-dipole interactions, while keeping a good enough light transmission for measurements. We monitor the deviation from the single atom behavior for near resonant light by varying the atomic density. We additionally monitor the spreading of photons inside the slab by injecting light only at the center of a disk of atoms. We also investigate collective excitations of the atomic gas. We measure the speed of sound which is linked to the superfluid density of the cloud and compare our results to a two-fluid hydrodynamic model predictions. Using a relevant geometry, we additionally study how an isolated system goes back to equilibrium. This is done by imaging the phase of the resulting Bose-Einstein condensate (BEC) after merging up to twelve BECs
12
Rolfsnes, Hans O. "Sonoptics : applications of light and sound in the context of biomedicine." Thesis, University of Dundee, 2011. https://discovery.dundee.ac.uk/en/studentTheses/d4619c09-a1c5-4fc0-86f6-a1b95ff6b6a8.
Full textAbstract:
Ultrasound, applied in combination with microbubbles, has potential as a means to enhance the uptake of therapeutic agents, which could include drugs and nucleic acids, into biological cells. This process is commonly referred to as 'sonoporation', and the enhanced uptake can be caused through the incident ultrasonic pressure fi eld causing radial oscillations (cavitation) in the microbubbles, amongst other possibilities. However, the mechanisms responsible for any resultant increase in cell membrane permeability are not yet fully understood. This project focussed on achieving a more fundamental understanding of these salient processes by building on a platform of previous work within the group. One strand of the project involved a complete characterisation of the performance of a rotating mirror high speed camera (Cordin 550-62) that was previously used by our group [and others] to investigate microbubble cavitation phenomena and interactions with proximal cell membranes. Speci cally, I present herein an investigation into the image formation process with this type of camera, the essence of which stymied previous data interpretations. I demonstrate that an inherent asynchrony in the exposure of pixels within individual image frames leads to a temporal anomaly. This was achieved using low cost, flashing LED lights and resulted in the extraction of an algorithm to correct for the temporal anomaly. In a slightly diff erent context, the delivery of suitable ultrasonic fields is necessary to achieve a uniform treatment across a therapeutic target. This thesis also reports on a study on the design of ultrasonic lenses to alter the focal region of a focussed ultrasound transducer with the aim of producing focal regions that can enable sonoporation of tumours of varying sizes. We show that the use of lenses can be an inexpensive alternative to more complex systems such as phased array transducers. Design modelling and experimental testing of lens prototypes are presented along with preliminary results with tissue mimicking polyacrylamide gel phantoms. The target environment in which the process of sonoporation will be clinically useful (i.e. in the physiological circulation) can be simpli ed as a microfluidic system. One strategy for bubble mediated therapy involves the use of a pro-drug approach, that is, when two otherwise benign ingredients are loaded onto separate microbubble populations, but can become mixed at the anatomical target site by the action of focussed ultrasound whereupon a potent drug is produced. The required mixing can be achieved by the violent coalescence of nearby cavitating bubbles, their reaction product then being released and di ffused into the interiour of nearby cells through sonoporation. A study related to this field is presented here where laser induced thermocapillary flows are shown to cause mixing of the content of a drop in a microfluidic channel in a bid to understand the mixing process at a level that may assist future microbubble engineering strategy. To summarise then, the work presented in this thesis has consolidated earlier unpublished data sets achieved by the group, providing new and exacting experimental evidence and an accurate algorithm that will facilitate post-processing of that earlier data (Chapters 2-3). Moreover, group aspirations to translate earlier in-vitro work on sonoporation towards next phase medical-phantom exposures have been boosted through the provision of a new direction involving acoustic lensing, the experimental data from which was used to completely validate existing models for our own design scenarios (Chapter 4). Finally, previous unpublished observations on microbubble coalescence undertaken by the group suggested a means to implement pro-drug delivery with direct in-situ mixing. Such suggestions were explored within microfluidic contexts using lasers to control and visualise the mixing processes that might arise in such situations (Chapter 5). All of these new insights have served to consolidate the group's previous and as yet unpublished data, opening the way for dissemination with confidence in the integrity of that data, and have also extended group capability and expertise in the areas of MHz-rate high speed framing cameras, the fabrication of acoustic lenses, and with microfluidic mixing.
13
Escalante, Fernández José María. "Theoretical study of light and sound interaction in phoxonic crystal structures." Doctoral thesis, Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/33754.
Full textAbstract:
En esta tesis se realiza un estudio teórico de la interacción luz-sonido en estructuras foxonicas,
con las cuales es posible el control de la luz y el sonido a la misma vez.
Esta interacción en dichas estructuras se estudia, tanto desde un punto de vista macroscópico
(diseño de estructuras para el confinamiento y guiado de ondas electromagnéticas y elásticas)
como microscópico (estudio de la interacción fotón-fonón en microcavidades y desarrollo
teórico de modelos cuánticos para la comprensión de dicha interacción).Escalante Fernández, JM. (2013). Theoretical study of light and sound interaction in phoxonic crystal structures [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/33754
TESIS
14
Tartibu, Lagouge K. "A multi-objective optimisation approach for small-scale standing wave thermoacoustic coolers design." Thesis, Cape Peninsula University of Technology, 2014. http://hdl.handle.net/20.500.11838/1307.
Full textAbstract:
Thesis submitted in fulfilment of the requirements for the degree
Doctor of Technology: Mechanical Engineering
in the Faculty of Engineering
at the Cape Peninsula University of Technology
2014Thermoacoustic heat engines provide a practical solution to the problem of heat management where heat can be pumped or spot cooling can be induced. This is new among emerging technology with a strong potential towards the development of sustainable and renewable energy systems by utilising solar energy or wasted heat. The most inhibiting characteristic of current thermoacoustic cooling devices is the lack of efficiency. Although simple to fabricate, the designing of thermoacoustic coolers involves significant technical challenges. The stack has been identified as the heart of the device where the heat transfer takes place. Improving its performance will make thermoacoustic technology more attractive. Existing efforts have not taken thermal losses to the surroundings into account in the derivation of the models. Although thermal losses can be neglected for large-scale applications, these losses need to be adequately covered for small-scale applications. This work explores the use of a multi-objective optimisation approach to model and to optimise the performance of a simple thermoacoustic engine. This study aims to optimise its geometrical parameters—namely the stack length, the stack height, the stack position, the number of channels and the plate spacing—involved in designing thermoacoustic engines. System parameters and constraints that capture the underlying thermoacoustic dynamics have been used to define the models. Acoustic work, viscous loss, conductive heat loss, convective heat loss and radiative heat loss have been used to measure the performance of the thermoacoustic engine. The optimisation task is formulated as a five-criterion mixed-integer nonlinear programming problem. Since we optimise multiple objectives simultaneously, each objective component has been given a weighting factor to provide appropriate user-defined emphasis. A practical example is provided to illustrate the approach. We have determined a design statement of a stack describing how the design would change if emphasis is placed on one objective in particular. We also considered optimisation of multiple objective components simultaneously and identified global optimal solutions describing the stack geometry using the augmented ε-constraint method. This approach has been implemented in GAMS (General Algebraic Modelling System). In addition, this work develops a novel mathematical programming model to optimise the performance of a simple thermoacoustic refrigerator. This study aims to optimise its geometrical parameters—namely the stack position, the stack length, the blockage ratio and the plate spacing—involved in designing thermoacoustic refrigerators. System parameters and constraints that capture the underlying thermoacoustic dynamics have been used to define the models. The cooling load, the coefficient of performance and the acoustic power loss have been used to measure the performance of the device. The optimisation task is formulated as a three-criterion nonlinear programming problem with discontinuous derivatives (DNLPs). Since we optimise multiple objectives simultaneously, each objective component has been given a weighting factor to provide appropriate user-defined emphasis. A practical example is provided to illustrate the approach. We have determined a design statement of a stack describing how the geometrical parameters described would change if emphasis is placed on one objective in particular. We also considered optimisation of multiple objective components simultaneously and identified global optimal solutions describing the stack geometry using a lexicographic multi-objective optimisation scheme. The unique feature of the present mathematical programming approach is to compute the stack geometrical parameters describing thermoacoustic refrigerators for maximum cooling or maximum coefficient of performance. The present study highlights the importance of thermal losses in the modelling of small-scale thermoacoustic engines using a multi-objective approach. The proposed modelling approach for thermoacoustic engines provides a fast estimate of the geometry and position of the stack for maximum performance of the device. The use of a lexicographic method introduced in this study improves the modelling and the computation of optimal solutions and avoids subjectivity in aggregation of weight to objective functions in the formulation of mathematical models. The unique characteristic of this research is the computing of all efficient non dominated Pareto optimal solutions allowing the decision maker to select the most efficient solution. The present research experimentally examines the influence of the stack geometry and position on the performance of thermoacoustic engines and thermoacoustic refrigerators. Thirty-six different cordierite honeycomb ceramic stacks are studied in this research. The influence of the geometry and the stack position has been investigated. The temperature difference across the stack and radiated sound pressure level at steady state are considered indicators of the performance of the devices. The general trends of the proposed mathematical programming approach results show satisfactory agreement with the experiment. One important aspect revealed by this study is that geometrical parameters are interdependent and can be treated as such when optimising the device to achieve its highest performance. The outcome of this research has direct application in the search for efficient stack configurations of small-scale thermoacoustic devices for electronics cooling.
15
Aktas, Murat K. Farouk Bakhtier. "Thermoacoustically induced and acoustically driven flows and heat transfer in enclosures /." Philadelphia, Pa. : Drexel University, 2004. http://dspace.library.drexel.edu/handle/1860/313.
Full text
16
Pocztar, Yuri M. "Heat, Light, and Gas Composition Subsystems of a Photo-Bioreactor." Ohio University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1289934242.
Full text
17
Akseli, Ilgaz Güden Mustafa. "The application of aliminum foam for the heat and noise reduction in automobiles/." [s.l.]: [s.n.], 2005. http://library.iyte.edu.tr/tezler/master/makinamuh/T000343.pdf.
Full textAbstract:
Thesis (Master)--İzmir Institute Of Technology, İzmir, 2005.Keywords: Aluminum matrix composites, thermal conductivity, sound insulation, foam, metal matrix composites, aluminum foam. Includes bibliographical references (leaves. 77-81).
18
Sun, Yaojun. "Heat transfer in molten core/concrete interaction systems." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/17105.
Full text
19
Bridenstine, Mark. "Convective heat transfer from a vertical cylinder in a high amplitude resonant sound field." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA320233.
Full textAbstract:
Thesis (M.S. in Mechanical Engineering) Naval Postgraduate School, September 1996.Thesis advisor(s): Ashok Gopinath. "September 1996." Includes bibliographical references (p. 95-96). Also available online.
20
Zhao, Zijun. "Investigation of white light confocal sensing methods for the scanning of early sound recordings." Thesis, University of Southampton, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.536328.
Full text
21
Mangipudy, Rajarajeswari Venkata Surya. "The Impact of Eliminating Extraneous Sound and Light on Students' Achievement: An Empirical Study." FIU Digital Commons, 2010. http://digitalcommons.fiu.edu/etd/269.
Full textAbstract:
The impact of eliminating extraneous sound and light on students’ achievement was investigated under four conditions: Light and Sound controlled, Sound Only controlled, Light Only controlled and neither Light nor Sound controlled. Group, age and gender were the control variables. Four randomly selected groups of high school freshmen students with different backgrounds were the participants in this study. Academic achievement was the dependent variable measured on a pretest, a posttest and a post-posttest, each separated by an interval of 15 days. ANOVA was used to test the various hypotheses related to the impact of eliminating sound and light on student learning. Independent sample T tests on the effect of gender indicated a significant effect while age was non- significant. Follow up analysis indicated that sound and light are not potential sources of extraneous load when tested individually.
22
Horton, Mark Lloyd. "Light, texture and sound in a training centre for the blind and visually impaired." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/5988.
Full textAbstract:
Includes bibliographical references.KENGO KUMA suggests that fashion driven architecture is a thing of the past as occupants begin to demand more from the space that they inhabit. This project aims for an architecture that connects building and occupant through the use of light, and materials, and the connection of them and the human body. Programme: a training centre for the blind and visually impaired that aims to assist the reintegration of the non-sighted and sighted communities through their economic independence. The building would also offer spaces such as a cafe and a conference centre that would generate funds, making the running of the building itself self-reliant.
23
Jeffrey, Liss. "The heat and the light of Marshall McLuhan, a 1990s reappraisal." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ44655.pdf.
Full text
24
Jeffrey, Liss 1955. "The heat and the light of Marshall McLuhan : a 1990s reappraisal." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=37528.
Full textAbstract:
Canadian intellectual Marshall McLuhan (1911--1980) left a controversial legacy. This dissertation addresses the four chief paradoxes that his work poses for contemporary commentators: the core meaning of his texts; the tradition in which his contribution now seems most intelligible; the divergent response to his work; and the enduring yet fragmentary impact of his contribution to popular and academic life. Taking a rhetoric of inquiry approach, modified by Gerald Holton's writing in the history of science, this reappraisal argues for McLuhan's significance as a theorist of communications as techno-cultural transformation or "mediamorphosis"; for his seminal role within the Toronto School of Communications; and for his inspiring relevance within the interdiscipline of communications, despite the forging of a negative academic consensus against his work in the early 1970s. McLuhan united the ancient arts of grammar and rhetoric into a techno-cultural hermeneutics that constitutes an unexhausted approach to the study of the impacts of media and technologies on sensibilities, literacies and culture.
25
De, Pieri Lucrezia A. "A study of light scattering and heat resistance of bacterial spores." Thesis, University of Nottingham, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293146.
Full text
26
Liu, Kin Ming. "Development of light-weight wall panels by extrusion technique /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202007%20LIUK.
Full text
27
Myronidi, Despoina. "LIGHT-BEAT: REACTIVE LIGHT FOR THE EMOTIONAL COMFORT OF NEWBORN BABIES." Thesis, KTH, Ljusdesign, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-297961.
Full textAbstract:
This is a project-based thesis focusing on the investigation of topics related to human newborns and the factors found in their surrounding environment that need to be assessed so as to provide them with a feeling comfort. The objective is to boost their emotional development by the means of light in a close relation to sound so as to provide them with a type of intelligence allowing them to normally interact within a society during their adult life, reassuring social equality and eliminating potential social exclusion due to unexpected behaviours. After researching topics to have a better understanding of the newborn baby and its enclosing environment, a luminaire design solution -functioning with a reactive scheme performed with integrated sound sensors- provided further results to the main topic investigation. The conceptual scheme for the product development was inspired by the connection between the newborn and their life-giver, closely linked to the cross-modality of sensory development before and after birth. Additional results were obtained with light measurement assessments and a parent survey targeting both the intended light quality subjective evaluations and the marketing strength of the designed product. This survey was used -along with other means- as a design evaluation tool at the final stage of the design process. Potential further improvements as well as considerations for a distinct spatial application are discussed in the final part of the thesis. The sustainability aspect covered within this degree project is closely linked to good physical and mental health aspects, clean energy use and efficiency achieved by the integration of input sound sensors and controls, and conscious production and consumption by the proposal of low global footprint materials for the luminaire design. In the conclusions, an overall summary of the thesis outcomes is presented and further research is proposed regarding both the main topic investigation as well as a greater user category that can be related to the light metric assessments that were carried out for this research.
28
Pardasani, Dheerja. "Induction of resistance to ultraviolet light in Escherichia coli by heat shock." Thesis, University of Ottawa (Canada), 1989. http://hdl.handle.net/10393/5898.
Full text
29
Akbari, Pegah. "Exploration of Heat Strain during Light to Moderate Intensity Exercise throughout Pregnancy." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38335.
Full textAbstract:
Regular physical activity is recommended in healthy pregnancies and has been shown to mitigate adverse pregnancy outcomes. Despite the benefits, many women do not adhere to the recommendations due to concerns of exercise-induced heat stress and the dangers it could pose to the developing fetus. While the majority of the concerns raised are not grounded in evidence, currently there are no studies that directly examine the isolated influence of pregnancy on metabolic heat production resulting from physical activity. Additionally, despite the prevalent use of psycho-physical tools in clinical settings, there is a scarcity of literature exploring the relationship between the physiological and perceptual measures of exercise-induced heat strain in the pregnant population. Therefore, objective one of this thesis was to quantify the heat production resulting from light to moderate physical activity (intensities recommended during pregnancy) throughout gestation. Secondly, in objective two, physiological and perceptual measures of thermal strain were compared and assessed throughout pregnancy. In evaluating the change in heat production resulting from exercise (objective one), 10 non-pregnant control (30±1 yrs; BMI=22.3±0.8 kg/m2) and 10 pregnant (32±1 yrs; pre-pregnancy BMI=22.8±0.8 kg/m2) women performed a seven stage submaximal walking test in a thermal controlled chamber (23ºC). Testing was performed during their 1st (T1, 12-16 wks), 2nd (T2, 24-28 wks) and 3rd (T3, 34-38 wks) trimester of pregnancy while metabolic heat production was measured through indirect calorimetry. To assess the changes in thermal and perceptual strain (objective two), 16 non-pregnant control (32±1 yrs; BMI=22.7±0.7 kg/m2), and 20 pregnant (32±1; pre-pregnancy BMI=23.2±0.6 kg/m2) women underwent a graded walking exercise protocol at T2 and T3. Over the course of this test, heart rate, tympanic temperature (Ttymp), skin temperature (Tskin), rate of perceived exertion (RPE, 20-point scale) and thermal sensation (9-point scale) were assessed. Findings from this thesis show that for the same given progressive exercise test, women in T1 experienced similar metabolic heat production to their non-pregnant counterparts. However, as pregnancy progressed, women exhibited on average, a 7-8% increase in heat production per trimester of pregnancy that can be accounted for by weight gain. Further, at baseline conditions, heart rate responses increased with pregnancy, while Ttymp remained unchanged and Tskin decreased. In response to exercise, the magnitude of change in heart rate, Ttymp and Tskin did not differ between gestational conditions. Finally, a strong correlation was identified between heart rate and RPE throughout pregnancy, while thermal sensation only directly correlated with Ttymp and not Tskin. Overall, the present findings suggest that while the same progressive exercise test results in greater levels of heat production as pregnancy progresses, this is not observed in physiological or perceptual measures of heat strain. Rather, findings of this thesis support the notion of improved thermoregulatory responses to account for the increase in metabolic heat production. Moreover, the present thesis provides support for the use of the RPE and thermal sensation scales as effective psycho-physical tools in the pregnant population under conditions of light to moderate exercise in normothermic conditions.
30
Sinha, Moitreyee. "PROBING POLYMER NETWORKS USING PULSE PROPAGATION AND BRILLOUIN LIGHT SCATTERING TECHNIQUES." University of Cincinnati / OhioLINK, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=ucin974213434.
Full text
31
Radavelli, Graziella Ferrer. "AVALIAÇÃO DA PERDA DE TRANSMISSÃO SONORA EM PAREDES EXTERNAS DE LIGHT STEEL FRAME." Universidade Federal de Santa Maria, 2014. http://repositorio.ufsm.br/handle/1/7873.
Full textAbstract:
Environmental noise at high levels and inappropriate construction techniques used in
conventional buildings in Brazil claim for a transition to better construction systems. Recently
the Brazilian standard NBR 15575:2013 established for the first time parameters and criteria
for residential building performance. In standard minimum requirements for sound insulation
are given, for example for external walls and roof structures. This way it is of fundamental
importance to have sound transmission loss data for diferente types of such elements at hand.
Taking into account that there is very little information on the sound transmission loss of
external walls of the light steel frame (LSF) type measurements of sound insulation of
different vertical external LSF walls typically used in Brazil were carried out. Eighteen
different LSF walls were mounted in the sound transmission measurement chamber of the
Federal University of Santa Maria and measurements were carried out in accordance with ISO
10140:2010. Sound insulation was characterized by means of the sound reduction index R, the
weighted sound reduction index Rw and the sound transmission class, making it possible to
compare the sound insulation of the LSF walls with data from the literature. The LSF walls
under investigation in this study used different materials such as OSB panels, cement boards,
plaster boards, Smartside panels, PVC panels, XPS panels and magnesium oxide boards for
the outer face. The influence of resilient channels and sponge tape, placed between the outer
face and the metalic studes, were also evaluated. The sound insulation of the diferente LSF
walls were found to be 43 dB ≤ Rw ≤ 50 dB and 45 dB ≤ STC ≤ 52 dB. Within the LSF walls
measured the one which used magnesium oxide boards on the outer face showed to have the
highest weight sound reduction index (Rw = 50 dB). Resilient channels, fabricated especially
for this study, and sponge tape were able to provide an increase of Rw and STC up to 5 dB
compared to the same wall without this resilient elements, and provide better sound insulation
especially for frequencies higher than 400 Hz. From the data it can be concluded that LSF
walls are more efficient regarding the sound insulation than single walls of the same surface
mass and in some cases even better than single walls of superior surface mass, such as walls
made of massive brick or concrete blocks.O excesso de ruído ambiental e as inadequadas técnicas construtivas dos sistemas convencionais utilizados no mercado da construção civil brasileira, fazem com que seja necessária a introdução de novas tecnologias construtivas mais racionais e produtivas. A partir da entrada em vigor da NBR 15575:2013 foram estabelecidos diversos parâmetros de desempenho para edificações habitacionais. A referida norma também estabelece exigências mínimas de isolamento acústico para os sistemas que compõem as edificações, entre eles, as vedações verticais. Desta forma, informações sobre o isolamento acústico providenciado pelos diferentes sistemas construtivos tornaram-se de fundamental importância. Tendo em vista a pouca informação existente na literatura sobre o isolamento sonoro de paredes externas em light steel frame (LSF), foram realizadas medições de perda de transmissão sonora em paredes externas executadas neste sistema construtivo, usadas tipicamente no mercado brasileiro. Dezoito composições de paredes em LSF foram montadas na câmara reverberante de transmissão sonora da UFSM para realização dos ensaios de perda de transmissão conforme procedimentos propostos pela ISO 10140:2010. O isolamento sonoro foi quantificado a partir dos espectros do índice de redução sonora R, pelo índice de redução sonora ponderado Rw e pela classe de transmissão sonora STC, facilitando a comparação entre diferentes composições de parede e dados de isolamento sonoro encontrados na bibliografia. Os principais materiais utilizados no revestimento das paredes LSF foram paineis OSB, placas cimentícias, placas de gesso acartonado, réguas Smartside, réguas de siding vinílico, painéis XPS e placas de óxido de magnésio. A influência da utilização de barras resilientes e fitas de espuma de PVC, entre as placas de revestimento e a estrutura metálica, também foi avaliada. Determinou-se que o isolamento sonoro das diferentes paredes LSF avaliadas é de 43 dB ≤ Rw ≤ 50 dB e 45 dB ≤ STC ≤ 52 dB. Dentre as paredes externas em LSF, aquela que utilizou placas de óxido de magnésio na face exterior apresentou o maior Rw = 50 dB. As barras resilientes e fitas de espuma de PVC foram capazes de aumentar o Rw e STC em até 5 dB, se comparado à parede semelhante sem estes dispositivos, especialmente nas frequências a partir de 400 Hz. A partir da análise dos dados, concluiu-se que as paredes LSF consideradas paredes duplas são mais eficientes no isolamento sonoro quando comparadas às paredes simples ou homogêneas de mesma massa e até do que algumas paredes com massa muito superior, como paredes de tijolos maciços, de blocos de concreto ou de blocos cerâmicos.
32
Rahman, Mohammed Moseeur. "Full-vectorial study of light and sound interactions in low and high index contrast silica waveguides." Thesis, City University London, 2016. http://openaccess.city.ac.uk/15045/.
Full textAbstract:
A full-vectorial finite element based approach has been developed to find accurate modal solutions of acoustic modes in Ge-doped and un-doped planar silica waveguides. The structural symmetry is exploited and Aitken’s extrapolation is also used to improve the accuracy of the solutions. The spatial dependences of the dominant and non-dominant displacement vectors are shown for the fundamental and higher order shear and longitudinal modes for Ge-doped core. The modal hybridness and modal birefringence between the two fundamental shear modes are also presented for this low index contrast waveguide. Further, rigorous analyses of the interactions between the guided acoustic and optical modes are performed for higher Ge-doped planar, for this case 10% doping is used. The Stimulated Brillouin Scattering (SBS) frequency and the overlaps between the fundamental and the higher order shear and longitudinal acoustic modes and the fundamental quasi-TE optical mode are presented. Brillouin gain spectrum for this moderate index contrast waveguide is determined. Furthermore, for a high index contrast air-clad rectangular silica strip waveguide, this program is used to accurately study the evolution of the acoustic modes. The existing structural symmetry is also exploited to reduce modal degeneration and to enhance the accuracy of the solutions. The interactions between the guided acoustic and optical modes are calculated after considering the full-vectorial nature of the modal fields. The SBS frequency and the overlaps between the fundamental and higher order acoustic modes with the fundamental quasi-TE optical mode are presented. The peak Brillouin gain, Brillouin gain spectrum (BGS), strength of Bragg gratings and threshold SBS power for this air-clad silica guide are also evaluated. Further comments are added on figure of merit (FOM) and acoustic attenuation coefficient for this air-clad silica waveguide.
33
Schittny, Robert Johannes [Verfasser], and M. [Akademischer Betreuer] Wegener. "Cloaking in Heat Conduction and Light Diffusion / Robert Johannes Schittny. Betreuer: M. Wegener." Karlsruhe : KIT-Bibliothek, 2015. http://d-nb.info/1078957770/34.
Full text
34
Onishi, Masanori. "Aozora : elemental processes of the blue sky : light scattering, atmospheric transport, heat adjustment." Kyoto University, 2008. http://hdl.handle.net/2433/136464.
Full textAbstract:
Kyoto University (京都大学)0048
新制・課程博士
博士(人間・環境学)
甲第13928号
人博第401号
新制||人||99(附属図書館)
19||人博||401(吉田南総合図書館)
UT51-2008-C844
京都大学大学院人間・環境学・環境学研究科相関環境学専攻
(主査)准教授 酒井 敏, 教授 鎌田 浩毅, 教授 宮本 嘉久
学位規則第4条第1項該当
35
White, Randall, Romain Mensan, Amy E. Clark, Elise Tartar, Laurent Marquer, Raphaëlle Bourrillon, Paul Goldberg, et al. "Technologies for the Control of Heat and Light in the Vézère Valley Aurignacian." UNIV CHICAGO PRESS, 2017. http://hdl.handle.net/10150/625468.
Full textAbstract:
We can trace the beginnings of our knowledge of early Upper Paleolithic (Aurignacian) use of fire to the pioneering 1910-1911 excavations at Abri Blanchard undertaken by Louis Didon and Marcel Castanet. At Blanchard, the excavators recognized and described fire structures that correspond in many ways to features excavated more recently in Western and Central Europe. Here, we address the issue of heat and light management in the early Upper Paleolithic, demonstrating a pattern that builds on these early excavations but that is refined through our recent field operations. Topics to be discussed include (1) recently excavated fire structures that suggest complex fire management and use, (2) the seemingly massive use of bone as fuel in most early Aurignacian sites, and (3) the anchoring of skin structures for purposes of heat retention with fireplaces behind animal-skin walls. Furthermore, new data on activities around fireplaces make it possible to infer social and organizational aspects of fire structures within Aurignacian living spaces. The vast majority of early Aurignacian occupations, most of them now dated to between 33,000 and 32,000 BP (uncalibrated), occurred on a previously unoccupied bedrock platform into which the occupants dug their fire features.
36
Lindén, Ronja, and Henrik Samuelsson. "Thermal analysis and design improvement of light module fixture." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Maskinteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-30485.
Full textAbstract:
Introduction One of the products made by SAAB Avionics Systems in Jönköping was in need of a better cooling solution. The product, a Head-Up Display, holds a LED that was overheating when run at desired input power. The purpose of this thesis was to identify the design weaknesses in the current solution regarding heat dissipation and produce new design proposals that fulfill the requirements. The parts analyzed consist of a LED light source, adjustment plates and a heat sink. The adjustment plates and heat sink where covered in a surface treatment. Theoretical framework A simulation of a finite element model was set up of the current solution in order to identify the influence of the different parts and their thermal properties. The simulation was set up as a steady state thermal model. The FEM and steady state equations used during this are mentioned and shortly explained. The state of modern research was found in order to find new innovative ways of solving the heat problem. Method In order to understand the current solution, experimentswere carried out. Interviews were used in order to get the correct information easily. A literature study was preformed to understand the different theories. Reverse engineering was applied to get a detailed understanding of the functionality both mechanically and thermally. Brainstorming was used to generate new solutions, which was followed by a feasibility evaluation and Pugh’s method to sort out the best concepts. Implementation and Result Based on the simulations it can be concluded that some of the developed solutions pass the requirements and can be implemented right away. Some need some more work in order to fully pass the demands. Conclusions The thermal flow was greatly affected by the properties of the aluminum in the adjustment plates and heat sink, though there was not much room for thickness reduction. However, the oxide layer and the surface roughness also had a great impact on the high junction temperature. The requirements where therefore met when adjustment plates and interfaces were removed, to lower the amount of oxide and air between the LED and the heat sink. But the oxide layers needed to be thinner and the surface roughness needed to be reduced in order to meet requirements. If the oxide layers need to stay at current thickness or the surface roughness cannot be changed, the heat sink needs to be redesigned. The recommended concepts were smaller than the current solution. If this space is utilized with a bigger heat sink, the goals can be met with greater ease. There is also room for improvement when it comes to heat sink heat spreader pattern. Discussion The discussion covers what knowledge which was needed to write this thesis and how different problems that occurred along its path were solved. Sustainability in different ways was also discussed.
37
Taylor, Adriennne A. "Deed done inthe light will eventually come to the dark: racial and sexual fear in Faulkner's Light in August and The Sound and The Fury." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 1998. http://digitalcommons.auctr.edu/dissertations/1805.
Full textAbstract:
The purpose of this study of William Faulkner is to identify and examine the importance of the presence of a racial and sexual "other" (an increasingly central term in post-modernist criticism) and how its impact dictated the direction and thematic scheme of Faulkner's literature. In particular, through this mode of analysis, we see how racial and sexual constructs, stemming from preconceived mores, taboos, and images, could infiltrate even one of the most innovative and creative fictive imaginations of the 20th century.
The thesis focuses upon two of Faulkner's novels-Light in August and The Sound and the Fury. Both of these works, abounding in themes generated by blackness and femininity, present complex social issues of race relations and sexuality in a manner that redirects the literary focus from the non-white and/or non-masculine victim to the white oppressor's fear. Even though Faulkner seeks, in part, to dismantle stereotypes and discuss racial relationships openly, he, too, was inevitably affected by his own personal racial environment. Light in August and The Sound and the Fury were utilized in seeking the answers to the following hypothesis: Could Faulkner be influenced by his Southern atmosphere and personal fear so much that he has incorporated white patriarchal constructs into his writings, thus, fostering and perpetuating the process of marginalizing and oppressing those who are non·-white and/or non~masculine?
The conclusions drawn from the research suggest that although William Faulkner shows sympathy for the plight of African Americans and females, he is, nonetheless, constrained by the Africanist and feministic presence which pervades his imagination and, thus, is reflected in the works emanating from his white Southern background.
38
Alibhai, Ali Asgar H. "From sound to light The changing symbolism of bells in Medieval Iberia in Christian and Muslim contexts /." Ann Arbor, Mich. : ProQuest, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1458189.
Full textAbstract:
Thesis (M.A. in Medieval Studies)--S.M.U.Title from PDF title page (viewed Mar. 16, 2009). Source: Masters Abstracts International, Volume: 47-01, page: 0138. Adviser: Pamela Patton. Includes bibliographical references.
39
Hinton, Kimberly D. "Extended heat treatment effects on the fracture toughness of cast aluminum alloy A357." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/17361.
Full text
40
Braunschweig, Suzanne Hill. "The acclimation ability of the shale barren endemic Eriogonum alleni to light and heat." Diss., Virginia Tech, 1993. http://hdl.handle.net/10919/40037.
Full textAbstract:
Shale barrens are unique habitats located throughout the southern Appalachians. They are characterized by a south or south west aspect, a steep slope, and an exposed rocky surface (Platt, 1951). They have a high total irradiance and can
experience temperatures higher than the surrounding deciduous forest.
A variety of plant species, several of which are rare or endangered, are endemic to the shale barren habitat. One reason proposed fc)r their endemism is that the plants are obligate heliophyt:es (Keener, 1983). The purpose of this dissertation is tel examine the acclimation ability of the shale barren endemic Eriogonum alIeni to shade and high temperature.Ph. D.
41
SU, KUN-FONG, and 蘇堃鳳. "Occupational Health Promotion -The Study of Influences With Sound-Light Technology And Aromatherapy on The Stress And Heart Rate Variability in The Smokers And Non-Smokers." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/9ag7tj.
Full textAbstract:
碩士經國管理暨健康學院
健康產業管理研究所
107
This study is to explore the influence of sound and light sound waves and aromatic scent as intervention measures on the subject's stress perception and heart rate variability analysis. The experimental research design is based on the employees of an enterprise in northern Taiwan with 30 adults of age between 20 ~ 65 years old. Firstly, the pressure perception scale was measured. Then 18 non-smokers who were grouped by carbon monoxide exhaling measurement were firstly employed with aromatic sniffing, and then received sound-light waves on the other week；another group of 12 smokers were involved in the sound-light sound waves, and then received the intervention of aromatic sniffing on the next week. Before and after the intervention measures, physiological values were measured by heart rate variability (HRV). The results of the study showed that there was no statistical difference in the pre- and post-test of the stress perception scale of non-smokers and smokers. Non-smokers after two interventions, heart rate variability analysis showed that heart rate decreased, HF increased significantly, sympathetic nerve stimulation was inhibited, parasympathetic nerve were promoted, and the intervention of aromatic scent was with TP (the total power of the heart rate) increased, and the mental energy is increased. The heart rate and LF/HF of the smoker's heart rate variability analysis (HRV) parameters measured by the two interventions decreased, TP increased, and the numerical changes showed statistical differences, indicating that sympathetic excitation was inhibited；but the single intervention either with sound-light wave or aromatic sniffing did not increase significantly in total heart rate. In the correlation between heart rate variability analysis and stress perception on smokers, only heartbeat was negatively correlated with TP. The results of this study can be regarded as a health promotion measure in workplace for a smoker to improve his heart rate variability and achieve autonomic nervous stability.
42
Whyte, Ralph Richard. ""A Light in Sound, a Sound-like Power in Light”: Light and/as Music in the History of the Color Organ." Thesis, 2019. https://doi.org/10.7916/d8-deyr-mt23.
Full textAbstract:
This dissertation examines the history of the relationship between light/color as an artistic medium and music. Looking at four artist-inventors from the eighteenth through to the mid-twentieth centuries, I consider how new arts of light and color arose from music, relied on music, and also distanced themselves from it. Drawing chiefly on published and unpublished primary sources, this dissertation compares artists’ and inventors’ conceptions of what this new art should be as it was continuously reimagined and reconstituted in their works, discourses, and technologies. I suggest a running tension throughout this history between the aspiration for a new and even autonomous art and its reliance on the music.
In Chapter 1, I investigate the work of the eighteenth-century French Jesuit monk Louis Bertrand Castel, who in 1725 proposed the first ever instrument for color music, his clavecin oculaire or ocular harpsichord. I note conflicting tendencies in his thought as he suggested two different avenues for color music: as a form of multimedia, and as a separate, silent medium capable of giving pleasure on its own. The next chapter turns to the color organ and color music of the late nineteenth-century inventor and artist Alexander Wallace Rimington. Drawing on contemporaneous theories of color, reception of Rimington’s performances, and the inventor’s own writings, I locate Rimington’s organ at the intersection of a continuing tradition of analogizing music and color and late nineteenth-century attempts to theorize color independently and systematically. I then demonstrate how Rimington’s desire to use color music as means of improving color perception can be understood as part of a larger debates about sensing color and color education around the turn of the twentieth century. Chapters 3 considers Mary Hallock Greenewalt’s instrument, the sarabet, and her art form, nourathar¸ while the final chapter looks at Thomas Wilfred’s (usually silent) light art, lumia. I suggest that Greenewalt and Wilfred’s relationship to music is a source of tension in their work, as they attempted to extricate and purify light art into an autonomous art form but display various forms of musical influence.
43
Basanta, Adam. "Compositional Strategies in Light and Sound Installations." Thesis, 2013. http://spectrum.library.concordia.ca/976949/1/Basanta_MA_S2013.pdf.
Full textAbstract:
This thesis explores various compositional strategies in light and sound installations using luminosonic objects: objects which appear to emit both sound and light. Contrary to accounts of media installations which are analyzed from a visual art perspective, in this research, audiovisual installations are analyzed through the application and adaptation of musical concepts and language to the installation context. In particular, selected audiovisual installations are analyzed with respect to the constitution,
or compositional dynamics, of audiovisual materials. This analysis results in a typology of audiovisual relations, represented within a three-dimensional compositional state-space.
Furthermore, the production of audiovisual, spatio-temporal compositional structures within the installation context is investigated in relation to the embodied, mobile spectator. The elucidation of audiovisual materials and spatio-temporal structures is illustrated through analysis of selected works, as well as through original artistic output. Finally, several implications of this interdisciplinary research are suggested in relation to the fields of audiovisual installation and contemporary music composition.
44
Hilbert, Shawn A. "Pulse propagation of sound, light, and electrons." 2009. http://proquest.umi.com/pqdweb?did=1694329141&sid=3&Fmt=2&clientId=14215&RQT=309&VName=PQD.
Full textAbstract:
Thesis (Ph.D.)--University of Nebraska-Lincoln, 2009.Title from title screen (site viewed June 26, 2009). PDF text: xiii, 178 p. : ill. ; 10 Mb. UMI publication number: AAT 3350448 . Includes bibliographical references. Also available in microfilm and microfiche formats.
45
Huang, Deshau. "Heat transfer in a sound-assisted fluidized bed /." Diss., 2002. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3073975.
Full text
46
Wu, You-Hao, and 吳游皓. "The LED Light Heat Transfer Identification." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/ky6v39.
Full textAbstract:
碩士國立臺北科技大學
製造科技研究所
99
This thesis maimly aim at developing the medical diagnosis lamp with LED, In consideration to the lighting in the use of heat that will reduce the thermal resistance to the design of the whole system to achieve effective heat dissipation, we use the system identification to find the transfer function for simulating the safe operating temperature when developing,the transfer function have a total of the number 4-order pole and 3- order zeros that are considering, then simulating the LED crystal core, metal, circuit boards ,the junction temperature and the thermal resistance,temperature can be controlled by each chip operating at safe temperatures.The simulate error is within 1%,the Max. temperature is 1.7℃,the relative error temperature is 0.01℃, relative error percent is 0.62%,after the security temperature will be obtained in accordance.The Tb simulated temperature distribution at between 45 ℃ ~ 76 ℃, and the experimental error of less than 0.8%, and then simulate the distribution curve of Tj Between 62.5 ℃ ~ 94.3 ℃ to 100 ℃, it indicated this analog of copper cooling, heat sink and fan links will make this lamp to achieve a good cooling effect.
47
Juang, Darming, and 莊達明. "The Study on Sound Insulation of Light Weight Wall." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/64194916311600888276.
Full textAbstract:
碩士國立成功大學
建築研究所
81
For the need of structure and constructing, partitions of high- rise buildings are gradually made of light-weight walls. Its merits of light-weight theoretically cause less property than masonary materials─brick or concrete in the performance of sound insulation. Furthermore, there is lacking sound insulation data of light-weight walls interiorly. The aim of this research is mainly in studying the performances of commonly available partition on the market, the differences between measurement and calculation and the factors of sound transmission loss. The main contents of the thesis are outlined in four parts as follows: (1) Investigation and Sortation─ There are 89 pieces of tests to be distributed into nine types according to the combinations of partitions. (2) Apply "sound intensity method" to measure sound transmission loss of the partitions, and use D-curve system to assess their sound insulation. Among these partitions, the worst one is the formica hollow wall with wood skeleton structure. The best one is the hollow wall filling with glasswool made of double gypsum panels. (3) Sound insulation performances of these partitions can be generalized into four types. They are ①single panel② coincidence with smooth curve ③coincidence with sharp curve ④ double panel. Comparing the laboratory measurement with calculation of mass law , when frequency is higher, the difference is more. For example, at 2KHz, there''s a distance of 20-30dB between them, because the hollow space is filled with glasswool or rockwool. (4) The factors of sound transmission loss,"Surface density" and "Total thickness" of partitions, can be analyzed with STC value in regression. The results of single panels are congruous with the mass law. The same as another two kinds of light-weight walls ,but the other''s coefficient of determination is low. Considering the other factor of transmission loss to find out the important factor helping for sound insulation of partitions.
48
Wang, Jung-Chi, and 王榮祺. "Improvement of Light Efficiency and Heat Dissipation of White Light LEDs." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/16347942818601444393.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
98
In this thesis, we focus on the subject of improvement of luminosity efficiency and cooling ability of heat dissipation for white light LEDs lamp. The purpose is to replace the conventional lamp. At beginning, we focus on the researches to achieve high luminosity efficiency of commercial white light LED. The study leads us to propose a concept of making a light bulb by a 3×3 LED array. A prototype is made. A serious measurement is performed to validate the concept. At present, the efficiency is about 60 to 70 lumens per watt for the commercial white light LED lamp with luminosity more than 600 lumens. For our 3 × 3 LED array bulb it can produce luminosity as high as 800 lumens. This new model can achieve light efficiency about 85 lumens per watt with the optimized input power. As regard to the heat issues, the common way to dissipate heat is heat-sink-fin, however we put the heat issues in a more comprehensive concept of systematic management of the hot spot. Not only we avoid the light bulb model producing high heat density, but also we use a similar concept of heat pipe to use non-conductive deionized water in a sealed space to contact white light LED hot spot. It rapidly takes away the heat from LED, enabling the white LED to continuously work on allowed temperature range, achieving a more perfect result and increasing the lamp lifetime. From the curve of efficiency, we compare the results of LED lamp with and without cooling mechanism and reach the conclusion that the lamp with cooling mechanism can maintain the efficiency of 80 lumens per watt and the lamp without cooling mechanism reduces to 70 lumens per watt after powered on 30 minutes. We verify that we can make a high power and high efficiency LED lamp to replace the commercial fluorescent lamp.
49
Zoontjens, Luke. "Numerical investigations of the performance and effectiveness of thermoacoustic couples." 2008. http://hdl.handle.net/2440/49091.
Full textAbstract:
Thermoacoustics is a field of study which includes devices purpose-built to exploit the phenomenal interaction between heat and sound. Thermoacoustics has been demonstrated as an effective technology which can potentially serve a variety of purposes such as cryogenics, cost-effective domestic refrigeration or electricity generation, without adverse environmental impact or commercial drawbacks such as expensive construction or maintenance costs or high part counts. The mechanisms by which thermoacoustic devices operate at low amplitudes have been identified and effective design tools and methods are available, but the precise heat and mass transfer which occurs deep inside the core of thermoacoustic devices at high amplitudes cannot at present be precisely determined experimentally, and to date have been estimated using only relatively simple or one-dimensional computational domains. It is expected that thermoacoustic devices will need to operate at relatively high pressure amplitudes for commercial and practical applications, to achieve power densities similar to competing technologies. Clearly, advancement of these models and the methods used to investigate them will enable a better understanding of the precise heat and mass transfer that occurs within such devices. Previous numerical studies have modelled a ‘thermoacoustic couple’ which consists of a single or several plates (often modelled with zero thickness) and channels within an oscillatory pressure field. In this thesis several improvements to the ‘thermoacoustic couple’ modelspace are introduced and modelled, and compared with published results. Using the commercial CFD software Fluent, a two-dimensional, segregated and second-order implicit numerical model was developed which solves equations for continuity of mass, momentum and energy. These equations were computed using second-order and double-precision discretisation of time, flow variables and energy. A computational domain is presented which is capable of modelling plates of zero or non-zero thickness, is ‘self-resonant’ and able to capture the entrance and exit effects at the stack plate edges. Studies are presented in which the acoustic pressure amplitude, the thickness of the plate (‘blockage ratio’) and the shape of the plate are varied to determine their influence upon the rate of effective heat transfer, flow structure and overall efficiency. The modelling of thermoacoustic couples with finite thickness presented in this thesis demonstrates that the finite thickness produces new results which show significant disturbances to the flow field and changes to the expected rate and distribution of heat flux along the stack plate. Results indicate that the thickness of the plate, t[subscript]s, strongly controls the generation of vortices outside the stack region and perturbs the flow structure and heat flux distribution at the extremities of the plate. Increases in t[subscript]s are also shown to improve the integral of the total heat transfer rate but at the expense of increased entropy generation. Another contribution of this thesis is the study of the effect that leading and trailing edge shapes of stack plates have on the performance of a thermoacoustic couple. In practice, typical parallel or rectangular section stack plates do not have perfectly square edges. The existing literature considers only rectangular or zero-thickness (1-D) plates. Hence a study was performed to evaluate the potential for gains in performance from the use of non-rectangular cross sections, such as rounded, aerofoil or bulbous shaped edges. Consideration of various types of stack plate edges show that performance improvements can be made from certain treatments to the stack plate tips or if possible, stack plate profiles. This thesis also considers the influence of thermophysical properties and phenomena associated with practical thermoacoustic devices to investigate the applicability of the numerical model to experimental outcomes. Comparisons made between results obtained using the numerical model, linear numerical formulations and experimental results suggest that the numerical model allows comparative study of various thermoacoustic systems for design purposes but is not yet of sufficient scope to fully characterise a realistic system and predict absolute levels of performance. However, the presented method of modelling thermoacoustic couples yields increased insight and detail of flow regimes and heat transportation over previous studies.http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1316904
Thesis (Ph.D.) -- University of Adelaide, School of Mechanical Engineering, 2008
50
Cheng, Chao-Chi, and 鄭兆岐. "Heat Dissipation Performance of Heat Pipe for The Application of Light Emitting Diode." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/98903227399612587705.
Full textAbstract:
碩士國立中興大學
精密工程學系所
96
The purpose of this study was to discuss the heat dissipation methods for light emitting diode. There are two major parts in the study: (1) Improving LED packaging materials. The behavior of having low thermal resistance and high thermal diffusion efficiency are evaluated by coating a copper material on LED base layer. We calculate the heat transfer simulation using 3-D finite element method. The simulation results of various packaging area parameters were presented. (2) To design heat pipe structures as heat sink for a interior LED illuminator set. The experiments were conducted to investigate the cooling characteristics of heat pipes by changing working fluid mass and working angle. Additionally, both discrete hotspot of LED and central heating of heat pipe were studied. From the first simulation result, it was found that the addition of 9cm2 copper-packaged area improves the thermal dissipation of LED, resulting in a reduction of chip temperature lower 5℃ than non-packaging pattern. Secondly, the results of heat pipe experiments show that when the experimental sets of LED illuminator of LED was used in horizontal angles, resulting in the heat pipe which fill 2.52g water volume have the best thermal properties than others. Resulting in the heat source temperature maintain in 50℃. Whereas other have higher temperature results due to the steam inside pipe choked. Next, when the LED illuminator sets was used in inclined angles, the heat pipe which fill 7.56g water volume have the best thermal properties than others. The heat source temperature can reach 60℃. All of the experiments were performed and the results were presented. The experiments results show in this study can therefore be used for the application of heat dissipation for LED.