Дисертації з теми "Light towers"
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Thörn, Frida, and Wilhelm Sjöstedt. "Estimating the Risk of Self-Initiated Upward Lightning to Onshore Wind Turbines and Towers." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-295598.
Повний текст джерелаFältobservationer har visat att vindkraftverk är särskilt utsatta för blixtar. En tidigare studie har analyserat sannolikheten för blixtar på vindkraftverk belägna ute till havs. I det här projektet analyserades sannolikheten för blixtar på vindkraftverk och en vädermast på land. Detta gjordes genom att samla väder och topografidata från de undersökta områdena, som sedan modellerades i COMSOL Multiphysics 5.5. Sannolikheten att ett kritiskt elektriskt fält uppstår beräknades med hjälp av MATLAB. Resultatet visar att risken för blixtar är korrelerat med topografin och molnhöjden.
Kandidatexjobb i elektroteknik 2020, KTH, Stockholm
Dai, Jiaqi. "Opening and Space: A contemplative tower in the woods." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/92697.
Повний текст джерелаMaster of Architecture
Reader, Paul. "Towards light switchable surfaces." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/17959.
Повний текст джерелаENGLISH ABSTRACT: Polymeric nanofibrous membranes that act as surfaces offer two compelling properties; they have extremely large surface areas that can be modified and they can offer multiple reactive sites depending on which polymer they were electrospun from. Combining nanofibrous surfaces such as these with photochromic dyes can give remarkable, light responsive materials. In this study, a terpolymer was electrospun and crosslinked (to impart insolubility to the material) to produce a nanofibrous mat that contained surface secondary-hydroxyl units and benzyl chloride units, from which monomers could grow using surface-initiated atom transfer polymerization (SI-ATRP). The surface was further fluorinated though the secondary-hydroxyl moieties to produce a hydrophobic crosslinked nanofibrous surface. n-Butyl acrylate and a photochromic spiropyran dye were copolymerized from the surface using SIATRP, in order to produce a surface that exhibited reversible adhesion towards a water droplet using ultraviolet and visible light as a stimulus to change between the two states. This in principle would allow the droplet to roll off and stick to the surface respectively. Although the surface displayed a colour change when switched, proving that the SI-ATRP had taken place, the droplet of water remained attached to the surface in both states.
AFRIKAANSE OPSOMMING: Polimeriese nanovesel membrane wat dien as oppervlaktes bied twee aantreklike eienskappe; hulle het baie groot oppervlakareas wat gemodifiseer kan word en hulle bied veelvuldige reaktiewe punte, afhangende van die polimeer waarvan hulle ge-elektrospin is. Deur sulke nanovesel oppervlaktes met fotochromiese kleurstowwe te kombineer, kan uitstekende lig reagerende materiale verkry word. In hierdie studie is ‘n terpolimeer ge-elektrospin en daarna gekruisbind (om die materiaal onoplosbaar te maak) om ‘n nanovesel web te kry wat oppervlak sekondêre-hidroksiel en benzielchloried eenhede bevat. Monomere kan dan vanaf hierdie eenhede groei deur middel van oppervlak-geïnisieerde atoomoordrag polimerisasie (OI-AOPR). Die oppervlak was verder gefluorineer via die sekondêre-hidroksiel eenhede om ‘n hidrofobiese, gekruisbinde nanovesel oppervlak te vorm. n-Butielakrilaat en ‘n fotochromiese spiropiraan kleurstof is gekopolimeriseer vanaf die oppervlak deur middel van OI-AORP om sodoende ‘n oppervlak te skep wat omkeerbare adhesie van ‘n water druppel gee as ultraviolet en sigbare lig as stimulus gebruik word om tussen die twee toestande te wissel. In beginsel sal die water druppel vanaf die oppervlak kan afrol én daaraan vassit, afhangende van die toestand van die oppervlak. Alhoewel die oppervlak van kleur verander het met die wisseling tussen die twee toestande, wat as bewys dien dat OI-AORP wel plaasgevind het, het die druppel water bly vassit aan die oppervlak in beide toestande.
Martin, Gregory Isaac. "Legitimizing the Senses and Provoking Emotions." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/33309.
Повний текст джерелаEvans, 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.
Повний текст джерелаMayeux, Annabelle. "Towards light-activated molecular devices." Thesis, University of Newcastle Upon Tyne, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.412647.
Повний текст джерелаGraham, Katherine Joy. "Scenographic light : towards an understanding of expressive light in performance." Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/20414/.
Повний текст джерелаTsui, Jeffrey (Jeffrey Ling Siu) 1975. "Hyper-light architecture : composite tower for Hong Kong." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/70343.
Повний текст джерелаIncludes bibliographical references (p. 94-102).
The initial concept of the thesis beg ins with an interest in understanding the materials, manufacturing and aesthetics of modern product design and its relation ship with architecture and space . The approach to the problem begins with an exploration of specific materials that are commonly used in other design and manufacturing fields but that are currently underutilized in the building construction industry. The thesis is an investigation of exploiting composite materials in developing a structural system for buildings and construction. Specific properties of composites, various connection . techniques as well as different construction/fabrication methods involved are essential issues that are explored throughout the design process. The project targets at creating a new typology and aesthetics in vertical building systems that takes advantage of the specific structural characteristics of these materials. Utilizing the characteristics of high -density site conditions such as the Central district in Hong Kong and through an application of a sensible programmatic organization, the project serves as a demonstration of the design within a realistic environment as well as within pragmatic constraints. The outline of the thesis is as follows: 1. Research and investigation of materials 2. Site analysis and background information, 3. Design requirements, criteria and decision-making 4. Models for experimentation and illustration of design ideas 5. Presentation materials
Jeffrey Tsui.
M.Arch.
Knotek, Michael P. "Adult faith growth through darkness, toward light /." Theological Research Exchange Network (TREN), 1988. http://www.tren.com.
Повний текст джерелаCailes, John. "Towards the light : A fictionalized (auto) biography." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2005. https://ro.ecu.edu.au/theses/673.
Повний текст джерелаAhmed, Ibrahim Abdelhamid Soliman. "Vacuum Ultraviolet Light Irradiation towards Photochemical Surface Architectures." Kyoto University, 2017. http://hdl.handle.net/2433/227625.
Повний текст джерелаHeffer, J. S. "Towards precision gravimetry using light-pulse atom interferometry." Thesis, University of Liverpool, 2017. http://livrepository.liverpool.ac.uk/3014202/.
Повний текст джерелаKotru, Krish. "Toward a demonstration of a Light Force Accelerometer." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62486.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 79-81).
The Light Force Accelerometer (LFA) is an optical inertial sensor in which radiation pressure from two counter-propagating laser beams optically confines a glass microsphere. Inertial acceleration of the device results in microsphere displacement along the sensitive axis, which is subsequently nulled by optical forces to provide an acceleration measurement. A simple calculation that takes into account fundamental noise processes in the LFA (i.e., shot noise and RIN in the laser beams) places the sensitivity limit of this accelerometer at < 100 ng. By incorporating widely available, inexpensive optical components into a simple design, a high-precision LFA could provide an appealing alternative to other sensors of comparable performance. Previous work on the LFA revealed instabilities in proof mass position detection caused by the asphericity of microspheres. In this thesis, an alternative method for position detection which was less sensitive to shape-irregularities in microspheres was investigated. Results indicated that resolution of microsphere motion was enhanced significantly when the new detection method was implemented. This improvement. however, did not eliminate the position instabilities observed previously. Capabilities for optical trapping with two counter-propagating beams in air were also developed in this work. Trapping with feedback position control in air was demonstrated for the first time, but long-term trapping in vacuum was prohibitively difficult due to destabilizing mechanical vibrations. For a microsphere in atmospheric pressure, the estimated bias stability was 318 jig after 300 seconds of averaging, and the approximate short-term sensitivity was 500 pg/v/ Hz. Stabilization of mechanical vibrations and precise calibration of power measurements to acceleration will allow this two-beam trap to probe the performance limits of the LFA.
by Krish Kotru.
S.M.
Powell, Alexander. "Engineering plasmonic light scattering with thin dielectric films : towards enhanced light trapping and novel sensing elements." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:c18025ef-a693-441d-bd88-e37ebc09b6a5.
Повний текст джерелаTomazou, Marios. "Towards light based dynamic control of synthetic biological systems." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/44243.
Повний текст джерелаXue, Jin Ph D. Massachusetts Institute of Technology. "Towards the efficiency limit of visible light-emitting diodes." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/108843.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 13-152).
In this thesis, a thermophotonic method based on the heat-pump mechanism is proposed to potentially enhance the efficiency of visible light-emitting diodes (LEDs) for high-power operation. By leveraging this special mode of solid-state lighting by incoherent electroluminescent radiation and with the focus on gallium-nitride (GaN) technologies, we experimentally demonstrate a thermally enhanced blue LED operating in the low bias regime, and theoretically investigate the characteristics and criteria for efficiency visible lighting based on a thermodynamic study.
by Jin Xue.
S.M. in Electrical Engineering
Morát, Julia. "Towards Stable Li-metal electrodefor rechargeable batteries." Thesis, Uppsala universitet, Strukturkemi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-306694.
Повний текст джерелаRomer-Jordan, Zachary L. "The Threshold of Experience: A Journey Toward Inward Reflection." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1275667134.
Повний текст джерелаDawson, Geoffrey E. "Toward a compact underwater structured light 3-D imaging system." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/83705.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 53-54).
A compact underwater 3-D imaging system based on the principles of structured light was created for classroom demonstration and laboratory research purposes. The 3-D scanner design was based on research by the Hackengineer team at Rice University. The system is comprised of a low-power, open-source hardware single-board computer running a modified Linux distribution with OpenCV libraries, a DLP pico projector, camera board, and battery module with advanced power management. The system was designed to be low-cost, compact, and portable, while satisfying requirements for watertightness. Future development and applications may involve navigation systems for an autonomous underwater vehicle (AUV). An initial study of 3-D imaging methods is presented, and the strengths and drawbacks of each type are discussed. The structured light method was selected for further study for its ability to produce high-resolution 3-D images for a reasonable cost. The build of the 3-D imaging system was documented for reproducibility, and subsequent testing demonstrated its functions and ability to produce 3-D images. An instruction guide for operation of the device is provided for future classroom and laboratory use. The 3-D imaging system serves as a proof-of-concept for utilizing structured light methods to produce 3-D images underwater. Image resolution was limited by the output resolution of the pico projector and camera module. Further exploration in obtaining ultra high-resolution 3-D images may include use of a more powerful projector and a higher resolution camera board module with autofocus. Satisfactory 3-D scanning validated the performance of structured light scanning above water. However, contaminants in the water hindered accurate rendering by the system while submerged due to light scattering. Future development of a on-the-fly mapmaking system for AUV navigation should include algorithms for filtering light scattering, and hardware should based on an instantaneous structured light system utilizing the Kinect 2-D pattern method. Autofocus and increased projector brightness would also be worthwhile additions.
by Geoffrey E. Dawson.
S.B.
Alazemi, Talal Zaid A. "Kuwaiti foreign policy in light of the Iraqi invasion, with particular reference to Kuwait's policy towards Iraq, 1990-2010." Thesis, University of Exeter, 2013. http://hdl.handle.net/10871/13803.
Повний текст джерелаRichter, Laura. "A VLBI polarisation study of 43 GHZ SiO masers towards VY CMA /." Link to this resource, 2005. http://eprints.ru.ac.za/784/.
Повний текст джерелаRichter, Laura. "A VLBI polarisation study of 43 GHZ SiO masers towards VY CMA." Thesis, Rhodes University, 2006. http://hdl.handle.net/10962/d1005284.
Повний текст джерелаSivashankar, Pratulya. "Energy and recycling implications of transitions towards light-weight passenger cars." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for vann- og miljøteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19194.
Повний текст джерелаHaverinen, H. (Hanna). "Inkjet-printed quantum dot hybrid light-emitting devices—towards display applications." Doctoral thesis, University of Oulu, 2010. http://urn.fi/urn:isbn:9789514261275.
Повний текст джерела王可欣 and Ho-yan Doris Wong. "Towards safe and environmentally sustainable public light bus servicesin Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B31635672.
Повний текст джерелаHorstmeyer, Roarke (Roarke William). "Towards a unified treatment of 3D display using partially coherent light." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/69525.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 111-120).
This thesis develops a novel method of decomposing a 3D phase space description of light into multiple partially coherent modes, and applies this decomposition to the creation of a more flexible 3D display format. Any type of light, whether it is completely coherent, partially coherent or incoherent, can be modeled either as a sum of coherent waves or as rays. A set of functions, known as phase space functions, provide an intuitive model for these waves or rays as they pass through a 3D volume to a display viewer's eyes. First, this thesis uses phase space functions to mathematically demonstrate the limitations of two popular 3D display setups: parallax barriers and coherent holograms. Second, this thesis develops a 3D image design algorithm based in phase space. The "mode-selection" algorithm can find an optimal holographic display setup to create any desired 3D image. It is based on an iterative algebraic-rank restriction process, and can be extended to model light with an arbitrary degree of partial coherence. Third, insights gained from partially coherent phase space representations lead to the suggestion of a new form of 3D display, implemented with multiple time-sequential diffracting screens. The mode-selection algorithm determines an optimal set of diffracting screens to display within the flicker-fusion rate of a viewer's eye. It is demonstrated both through simulation and experiment that this time-sequential display offers improved performance over a fixed holographic display, creating 3D images with increased intensity variation along depth. Finally, this thesis investigates the tradeoffs involved with multiplexing a holographic display over time with well-known strategies of multiplexing over space, illumination angle and wavelength. The examination of multiplexing tradeoffs is extended into the incoherent realm, where comparisons to ray-based 3D displays can hopefully offer a more unified summary of the limitations of controlling light within a volume.
by Roarke Horstmeyer.
S.M.
Bajpayee, Abhishek. "Towards real-time light field processing for quantitative imaging and perception." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/119341.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 139-147).
This thesis aims to make light field imaging based 3D particle image velocimetry (PIV) practically feasible and affordable. In addition, this thesis also extends light field imaging techniques developed with PIV as a target application, for improved perception in robotics. Building upon the basic concepts of light field (LF) imaging which were developed as early as 1996, synthetic aperture (SA) PIV was demonstrated for the purpose of conducting accurate 3D PIV. However, when introduced, SAPIV had multiple limitations such as the need for 9 to 10 cameras as opposed 4 to 5 required by the popular tomographic PIV (Tomo-PIV) technique. In addition, SA reconstruction suffered from low reconstruction quality, slow computation speed and lack of robust and easy to use software. As a result, the adoption of SAPIV as a flow visualization technique was limited. Particle field reconstruction using LF or SA imaging succeeds by being able to systematically eliminate backscatter from illuminated particles in an experimental scene. A densely seeded PIV experiment can have a large amount of backscatter from particles in the volume of interest and a large synthetic aperture setup is capable of effectively seeing through this backscatter and accurately resolve features of interest at specific spatial coordinates. Work surrounding 3D PIV highlighted in this thesis improves the efficiency with which SA reconstruction eliminates out of focus particle backscatter thereby improving accuracy using less resources. These developments bridge the gap between SAPIV and other 3D PIV techniques. In addition, coupled with the homography fit method based SA reconstruction technique, presented results show that SAPIV, for the same experimental setup, is significantly faster and cheaper while achieving the same high level of accuracy. Developments of theoretical aspects of LF imaging for 3D PIV to improve visibility in scenes with large volume backscatter are fitting for applications in other areas as well. Mobile robots, especially autonomous cars, currently utilize multiple sensors such as cameras, LIDAR and RADAR for the purpose of localization and perception. However, visual sensing and autonomy in the face of edge cases and unexpected changes in scenes such as poor lighting, extreme weather conditions with heavy rain or snow etc. remains a challenge. We present a framework to facilitate the use of any multi-camera system as an array for LF capture along with a rendering methodology formulation that allows us to render LF images along arbitrary surfaces in scenes. In addition, by implementing our rendering technique to run on graphical processing units (GPUs), which have recently become affordable and easily available, we demonstrate the use of LF imaging for real-time perception for the first time. We envision that this framework can eventually help improve perception for robots by supplementing higher level algorithms.
by Abhishek Bajpayee.
Ph. D.
Lindh, Mattias. "Inkjet deposition of electrolyte : Towards Fully Printed Light-emitting Electrochemical Cells." Thesis, Umeå universitet, Institutionen för fysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-80272.
Повний текст джерелаTorgersrud, Cody. "Light and Privacy, A proposal towards a testing and education standard." Thesis, KTH, Ljusdesign, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-280040.
Повний текст джерелаBurks, Sidney. "Towards a Quantum Memory for Nonclassical Light with Cold Atomic Ensembles." Paris 6, 2010. http://www.theses.fr/2010PA066380.
Повний текст джерелаDean, Ryan. "Towards visible light switching of peptide-DNA and peptide-protein interactions." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/111805/.
Повний текст джерелаAmmons, Stephen Mark. "Towards advanced study of Active Galactic Nuclei with visible light adaptive optics /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2009. http://uclibs.org/PID/11984.
Повний текст джерелаWong, Ho-yan Doris. "Towards safe and environmentally sustainable public light bus services in Hong Kong." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B31635672.
Повний текст джерелаBurks, Sidney. "Towards A Quantum Memory For Non-Classical Light With Cold Atomic Ensembles." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2010. http://tel.archives-ouvertes.fr/tel-00699270.
Повний текст джерелаRajabali, Anar. "(Re)turning to the poetic I/eye : towards a literacy of light." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/61048.
Повний текст джерелаEducation, Faculty of
Language and Literacy Education (LLED), Department of
Graduate
Evans, Reed, Ricardo García Guerra, Myriam Schaefer, and Isabella Wagner. "The Green Light towards Sustainability : Embedding Sustainability into a Branded Design Company." Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2398.
Повний текст джерелаNalbantoglu, Tugrul. "Towards a hydrogen bond mediated directional walker and light driven molecular shuttles." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/towards-a-hydrogen-bond-mediated-directional-walker-and-light-driven-molecular-shuttles(fb210b38-4079-4376-942e-b907a8f82d3f).html.
Повний текст джерелаRoques-Carmes, Charles. "Towards broadly-tunable CMOS-compatible silicon light sources in the near-infrared." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/118049.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 47-52).
The efficient extraction of light from silicon is one of the longstanding challenges of modem engineering and physics. The difficulty mainly arises from silicon's indirect bandgap and the short lifetime of non-radiative processes such as Auger recombination. Nonetheless, the realization of an energy efficient silicon-based photon source could find broad applicability in areas such as ultra-large scale integration (ULSI), optoelectronic displays and lighting. Every practical solution proposed thus far to this fundamental, yet technologically critical problem, relies on the physical patterning or chemical modification of silicon substrates, most of these transformations requiring high annealing temperatures or fabrication steps that are not compatible with conventional ULSI processes. In this thesis, we experimentally demonstrate the generation of tunable radiation in the near-infrared (800 to 1600 nm) from a simple periodic silicon grating. The light emission is generated by spontaneous emission from these gratings interacting with low-energy free electrons (as low as 2 keV) and is recorded in the silicon transparency window. We develop time-domain numerics that confirms our experimental results and our evaluation of the output radiation power. In addition, we theoretically investigate the feasibility of an allsilicon compact tunable radiation source at telecommunication wavelengths comprised of a silicon Field Emitter Array (FEA) integrated with a silicon periodic structure. Our results pave the way towards the realization of a CMOS-compatible electrically-pumped silicon light source.
by Charles Roques-Carmes.
S.M.
Mc, Galey William. "Changing Attitudes Towards Immigrants in Light of Worsening Economic Conditions in Portugal." Thesis, Stockholms universitet, Sociologiska institutionen, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-128461.
Повний текст джерелаPeers, Martyn. "Ruthenium(II) and iridium(III) complexes as photosensitisers towards light-driven biocatalysis." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/rutheniumii-and-iridiumiii-complexes-as-photosensitisers-towards-lightdriven-biocatalysis(ad591d9d-298c-4eca-9ccd-88df626c9fa8).html.
Повний текст джерелаChaigne, Thomas. "Control of scattered coherent light and photoacoustic imaging : toward light focusing in deep tissue and enhanced, sub-acoustic resolution photoacoustic imaging." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066162/document.
Повний текст джерелаLight focusing is a crucial requirement for high resolution optical imaging. In biological tissue though, refractive index inhomogeneities scatter light, preventing any focusing beyond one millimeter. Wavefront shaping techniques have been recently developed to partially compensate for light scattering after propagation through a scattering medium. These techniques require a measurement of the light intensity at the target point. These techniques hold much promise for performing wavefront correction in order to focus light deep inside scattering media. This would require a non-invasive measure of the light intensity at depth. In this PhD study, we propose to use the photoacoustic effect for such task. An optically absorbing structure under pulsed illumination indeed generates ultrasonic waves, whose amplitude is proportional to the absorbed light intensity. These ultrasounds mostly propagate in a ballistic way, and can therefore be detected with an external transducer. We have shown that photoacoustic imaging could be used to measure the transmission matrix of a scattering sample, enabling to focus light on absorbing structures as well as to retrieve mesoscopic properties of the medium. We have shown that the broadband spectral content of the photoacoustic signals can be harnessed to improve the focusing performances. Finally, we demonstrated that coherent illumination could be used to remove fundamentals artefacts, as well as to break the acoustic resolution limit of conventional deep tissue photoacoustic imaging
Taylor, Jonathan Lorin. "Lines of Discovery." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/35461.
Повний текст джерелаMaster of Architecture
Claros, Casielles Miguel. "Development of Visible Light Photoredox Methodologies towards the Activation of Carbon-Halogen Bonds." Doctoral thesis, Universitat Rovira i Virgili, 2020. http://hdl.handle.net/10803/669435.
Повний текст джерелаMetodologías fotocatalíticas bajo irradiación de luz visible han sido desarrolladas con varios sustratos disponibles en el mercado como por ejemplo los ácidos carboxílicos, trifluoroboratos alquílicos de potasio, silicatos alquílicos de amonio o ésteres activados entre otros. Bajo irradiación de luz, estos precursores se activan mediante procesos de transferencia de un solo electrón con catalizadores fotoexcitables (PC). Entre ellos, los haluros orgánicos son socios de acoplamiento convenientes en la fotocatálisis, ya que experimentan una escisión del enlace C-halógeno catalizada por varios PC en presencia de un dador de electrones. Los cloruros de alquilo no activados, que son fácilmente disponibles y materias primas estables, exhiben una inercia química inherente, en parte, debido a sus negativos potenciales de reducción. Esto impidió su uso generalizado como precursores radicales en la fotocatálisis de luz visible. En esta disertación doctoral exploramos el uso de un sistema catalítico dual basado en metales de la primera serie de transición (Cu, Co, Ni) para la activación de estos enlaces inertes C-Halógeno. El diseño del catalizador ha sido clave para desarrollar una metodología suave y general para la reacción de deshalogenación y la ciclación reductora intramolecular de haluros de alquilo no activados con alquenos o alquinos unidos. La escisión de fuertes enlaces Csp3-X está mediada por un intermedio de cobalto o níquel en bajo estado de oxidación altamente nucleófilo generado por reducción fotocatalítica de luz visible que emplea un fotosensibilizador de cobre.
Visible light photoredox Catalysis have been accomplished with several readily available bench-stable chemicals such as carboxylic acids, potassium alkyltrifluoroborates, ammonium alkyl silicates or redox-active esters among others. Under light irradiation, these precursors get activated by single-electron transfer processes with photoexcitable catalysts (PCs). Among them, organic halides are convenient coupling partners in photocatalysis since they undergo reductive C-halogen bond cleavage catalysed by several PCs in the presence of a sacrificial electron-donor. Non-activated alkyl chlorides, which are readily available and bench-stable feedstocks, exhibit an inherent chemical inertness, in part, due to their large negative reduction potentials. This precluded their widespread use as radical precursors in visible-light photocatalysis. In this doctoral dissertation we explored the use of a dual catalyst system based on first-row transition metals (Cu, Co, Ni) for the activation of these inert Carbon-Halogen bonds. Catalyst design has been key for developing a mild and general photoredox methodology for the dehydrodehalogenation reaction and the intramolecular reductive cyclization of non-activated alkyl halides with tethered alkenes or alkynes. The cleavage of strong Csp3-X bonds is mediated by a highly nucleophilic low-valent cobalt or nickel intermediate generated by visible-light photoredox reduction employing a copper photosensitizer
Gu, Gong. "Stacked organic light emitting devices an approach toward full color flat panel displays /." Click to view the dissertation via Digital dissertation consortium, 1999.
Знайти повний текст джерелаTellez, Limon Ricardo. "Light propagation in integrated chains of metallic nanowires : towards a nano-sensing device." Thesis, Troyes, 2014. http://www.theses.fr/2014TROY0039/document.
Повний текст джерелаLocalized surface plasmons (LSP) are used to control and concentrate the electromagnetic field in small volumes of matter. This is a very interesting property in the context of biophotonics. Indeed, it allows an enhancement of the light-matter interaction at the cell scale, or even at a single molecule scale. The technological challenge is to propose optical devices able to efficiently couple light into localized plasmonic modes and to improve the detection of signals resulting from the interaction between the confined light and the analyte under detection.In this thesis work, we theoretically and experimentally study the guiding and confinement properties of light in periodic arrays of metallic nanowires of rectangular and triangular (nanocones) cross section that support localized plasmons. These nanowires are integrated in a photonic circuit that enables an efficient light coupling. The extinction spectra of the plasmonic resonances are directly obtained by analyzing the transmitted light in the device. By making use of the Fourier modal method, we perform an exhaustive theoretical study of the plasmonic Bloch modes that propagate due to the near-field coupling of the localized plasmons resonances. It is demonstrated that for the metallic nanocones, the optical field can be strongly enhanced by a controllable tip effect and remarkably intense
Johnson, Claire. "Studies towards the synthesis of photosensitizers with improved biodistribution and light-absorbing properties." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ27170.pdf.
Повний текст джерелаBaiocco, Giorgio <1984>. "Towards a Reconstruction of Thermal Properties of Light Nuclei from Fusion - Evaporation reactions." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4295/.
Повний текст джерелаBerry, Andrew Edward. "Towards a molecular mechanism for light induction of gene transcription in Myxococcus xanthus." Thesis, University of Warwick, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340067.
Повний текст джерелаKuhle, Jens. "Towards quantifying axonal damage in blood samples from patients with neurological diseases." Thesis, Queen Mary, University of London, 2015. http://qmro.qmul.ac.uk/xmlui/handle/123456789/9085.
Повний текст джерелаSuzuki, Hajime. "Design of novel semiconductor photocatalysts and cocatalysts toward efficient water splitting under visible light." Kyoto University, 2018. http://hdl.handle.net/2433/232052.
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