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Dissertations / Theses on the topic 'Lighting change'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Sheorey, Sameer. "Recognition and matching in the presence of deformation and lighting change." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8892.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2008.<br>Thesis research directed by: Dept. of Computer Science. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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Linegar, Chris. "Vision-only localisation under extreme appearance change." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:608762bd-5608-4e50-ab7b-da454dd52887.

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Robust localisation is a key requirement for autonomous vehicles. However, in order to achieve widespread adoption of this technology, we also require this function to be performed using low-cost hardware. Cameras are appealing due to their information-rich image content and low cost; however, camera-based localisation is difficult because of the problem of appearance change. For example, in outdoor en- vironments the appearance of the world can change dramatically and unpredictably with variations in lighting, weather, season and scene structure. We require autonomous vehicles to be robust un

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3

Bales, Michael Ryan. "Illumination compensation in video surveillance analysis." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39535.

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Problems in automated video surveillance analysis caused by illumination changes are explored, and solutions are presented. Controlled experiments are first conducted to measure the responses of color targets to changes in lighting intensity and spectrum. Surfaces of dissimilar color are found to respond significantly differently. Illumination compensation model error is reduced by 70% to 80% by individually optimizing model parameters for each distinct color region, and applying a model tuned for one region to a chromatically different region increases error by a factor of 15. A background mo

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4

Phang, Shiau Shing. "Investigating and developing a model for iris changes under varied lighting conditions." Queensland University of Technology, 2007. http://eprints.qut.edu.au/16672/.

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Biometric identification systems have several distinct advantages over other authentication technologies, such as passwords, in reliably recognising individuals. Iris based recognition is one such biometric recognition system. Unlike other biometrics such as fingerprints or face images, the distinct aspect of the iris comes from its randomly distributed features. The patterns of these randomly distributed features on the iris have been proved to be fixed in a person's lifetime, and are stable over time for healthy eyes except for the distortions caused by the constriction and dilation of the p

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5

McMenemy, K. R. "Photometric evaluation of aerodrome ground lighting." Thesis, Queen's University Belfast, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273182.

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6

Jama, Mariel Grace. "Semiconductor composites for solid-state lighting." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0207/document.

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Phases organiques luminescentes qui sont incorporés dans une matrice inorganique conductrice est proposé dans cette étude pour la couche active d'une diode émettant de la lumière hybride. Dans ce composite, le colorant organique joue le rôle de site de recombinaison radiative de porteurs de charge qui sont injectées dans la matrice de transport ambipolaire inorganique. Comme l'un des combinaisons de matériaux de candidat, bicouche et des films minces composites de ZnSe et un complexe d'iridium rouge (Ir(BPA)) émetteur de lumière organique ont été préparé in situ par UHV technique d'évaporation

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7

Koshak, William John. "Analysis of lightning field changes produced by Florida thunderstorms." Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/185259.

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An interactive computer program .has been developed to compute accurate values of lightning-caused changes in the cloud electric field (ΔE). The ΔE' s for individual discharges in eight Florida thunderstorms have been analyzed using a nonlinear, least-squares minimization procedure and point charge (Q) and point dipole (P) models of the change in cloud charge. The results indicate that the temporal and spatial behavior of the Q- and P- model parameters are similar to those reported previously by Koshak and Krider [1989]. In all storms, the high altitude P-vectors tend to point downward toward

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8

Finney, Declan Luke. "Present-day and future lightning, and its impact on tropospheric chemistry." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/23643.

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Lightning represents a key interaction with climate through its production of nitrogen oxides (NOx) which lead to ozone production. These NOx emissions are generally calculated interactively in chemistry-climate models but there has been little development of the representation of the lightning processes since the 1990s. In most models the parametrisation of lightning is based upon simulated cloud-top height. The aims of the thesis are: to explore existing schemes, and develop a new process-based scheme, to parametrise lightning; to use a new process-based lightning scheme to give insights reg

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Maggio, Christopher Ross. "Estimations of lightning charge transfers in New Mexico thunderstorms and applications to lightning energy, thunderstorm generator currents, and above-cloud transient currents /." Full text available from ProQuest UM Digital Dissertations, 2007. http://0-proquest.umi.com.umiss.lib.olemiss.edu/pqdweb?index=0&did=1609152051&SrchMode=1&sid=1&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1245341216&clientId=22256.

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Oliveira, Ruben Filipe Madeira de. "Energy efficiency and climate policy in the management of public spaces: public lighting." Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/15821.

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Mestrado em Sistemas Energéticos Sustentáveis<br>Public Lightning is an important part of municipality’s nighttime landscape. Lighting can be used to enhance public safety and security while improving the aesthetic appeal of the surrounding properties but with the current global financial crisis, such lighting systems must also be sustainable. Most climate policy efforts focus on the state and international level, however national governments won’t be able to meet their international commitments without local action. In Portugal, the Public Lighting is responsible for 3% of energy con

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11

Zhu, Fang. "Charge mechanisms for PTFE spacer service under DC and lightning impulse voltage in SFâ‚†." Thesis, University of Strathclyde, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432015.

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12

Rao, Smitha. "Before the Lightning Strikes: Preparedness, Capacities, and Social Welfare Policy ; Micro, Mezzo, and Macro Correlates of Disaster Preparedness." Thesis, Boston College, 2021. http://hdl.handle.net/2345/bc-ir:109100.

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Thesis advisor: Shanta Pandey<br>Thesis advisor: Samantha Teixeira<br>Anthropogenic climate change will push 100 million of the world’s population into poverty in the next decade, and worsen economic, food, and housing insecurity. Natural disasters are some of the most manifest markers of climate change impacts, set to become more intense and frequent as a result of the climate crisis. The brunt of these stressors falls disproportionately on the most marginalized populations across the world - women, children, people with disabilities, and older adults, among other disadvantaged groups. Despit

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Maurice, Eric. ""Send Forward Some Who Would Fight": How John T.Wilder and His "Lightning Brigade" of Mounted Infantry Changed Warfare." Digital Commons @ Butler University, 2016. http://digitalcommons.butler.edu/grtheses/416.

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The 17th Indiana Volunteer Regiment was part of “Wilder’s Lightning Brigade”, a mounted infantry brigade under Col. John T. Wilder. Through his efforts he mounted his infantry on horseback and equipped them with Spencer Repeating Rifles. This paper argues that these changes were deliberate on the part of John T. Wilder rather than emulating others, led to a conscious and noticeable change in tactics, that these changes were effective, and examines the Brigade’s influences on future military tactics. Through the use a various Primary and Secondary sources, with heavy emphasis placed on diaries,

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Hlazo, Noluthando. "Effects of a dialogical argumentation instructional model on grade 10 learners’ conceptions of lightning." Thesis, University of the Western Cape, 2014. http://hdl.handle.net/11394/4000.

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Magister Educationis - MEd<br>The study employed a quasi-experimental design to determine the effect of DAIM on learners’ conceptions of lightning. The experimental group was taught using DAIM while the control group was taught the same content using TLM. Data was collected using the Science Attitude Questionnaire (SAQ), Beliefs about Lightning Questionnaire (BALQ), Conceptions of Lightning Questionnaire (COLQ) and Science Achievement Test on Lightning (SATOL) which was used to determine learners’ overall performance on the topic of electrostatics. The data was analysed using both qualitative

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15

Murray, Lee Thomas. "Factors Controlling Variability in the Oxidative Capacity of the Troposphere on Interannual to Interglacial Time Scales." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11034.

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This thesis explores the natural forces controlling variability of the tropospheric oxidants on interannual to glacial-interglacial time scales. The oxidants (primarily OH and ozone) determine the lifetime of many trace gases of human interest, including air pollutants and long-lived greenhouse gases such as methane. The oxidants respond to meteorological conditions, precursor emissions (natural and anthropogenic), and surface and overhead stratospheric boundary conditions, all of which have changed since the Last Glacial Maximum (LGM; ~21ka). This dissertation first examines in mechanistic de

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16

Sheehan, Timothy J. "Modeling Wildfire and Ignitions for Climate Change and Alternative Land Management Scenarios in the Willamette Valley, Oregon." Thesis, University of Oregon, 2011. http://hdl.handle.net/1794/12184.

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xii, 127 p. ： ill. (some col.)<br>I developed software to incorporate the FlamMap fire model into an agent-based model, Envision, to enable the exploration of relationships between wildfire, land use, climate change, and vegetation dynamics in the Willamette Valley. A dynamic-link library plug-in utilizing row-ordered compressed array lookup tables converts parameters between polygon-based Envision data and grid-based FlamMap data. Modeled fires are determined through Monte-Carlo draws against a set of possible fires by linking historic fire data to future climate projections. I used cla

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17

Motta, Leandro Chelski da. "Conversor de único estágio baseado na integração Charge-Pump Valley-Fill para acionamento de LEDs de potência." Universidade Tecnológica Federal do Paraná, 2017. http://repositorio.utfpr.edu.br/jspui/handle/1/2887.

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Este trabalho propõe um sistema eletrônico de único estágio para acionar LEDs de potência empregando os conceitos Charge-Pump e Valley-Fill. Ambos conceitos estão relacionados a configurações topológicas baseadas na integração de um retificador boost de entrada com um inversor meia onda de saída, caracterizando o sistema de único estágio. A configuração Charge-Pump é utilizada para diminuir a ondulação de corrente dos LEDs. A configuração Valley-Fill é empregada para grampear a tensão de barramento CC em níveis inferiores ao valor de pico da tensão da fonte de entrada durante um longo interval

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18

Karimi, Seywan. "Dielectrics calculation of on-load tap-changer VUCL." Thesis, KTH, Hållbar produktionsutveckling (ML), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-292536.

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This is a bachelor's thesis in Mechanical engineering. The main topic of the thesis is the electrical calculation of the tap changer's shield. Although there are many kinds of tap-changers, this study focuses on VUCL models. The theoretical background of the thesis is that the new shield is suitable and useable in all VUCL models. The primary topic of the thesis is to study that the new shield protects the resistance box in the middle of the tap changers. To do this study, Creo Parametric, Comsol, and SpaceClaim are the programs used.<br>Detta är en kandidatexamen i maskinteknik. Avhandlingens

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Bovalo, Christophe. "Activité électrique et variations d’intensité des systèmes convectifs tropicaux dans le sud-ouest de l’océan Indien : observations et modélisation." Thesis, La Réunion, 2013. http://www.theses.fr/2013LARE0001/document.

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Depuis une vingtaine d'années, la qualité de la prévision de la trajectoire des cyclones tropicaux a fortement progressé mais peu d'améliorations ont été apportées à la prévision de l'intensité. Cette thèse s'intéresse aux changements d'intensité des cyclones tropicaux du sud-ouest de l'océan Indien sous l'angle original de l'activité électrique.Une première étude climatologique s'appuyant sur les données du réseau de détection d'éclairs World Wide Lightning Location Network (WWLLN) a permis de valider la qualité de ces données et de montrer que les cyclones tropicaux pouvaient être une source

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Baharudin, Zikri Abadi. "Characterizations of ground flashes from tropic to northern region." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-222838.

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This thesis portrays new information concerning the cloud-to-ground (CG) lightning flashes or ground flashes produced by thunderclouds. It emphasizes the importance of characterizing lightning studies as the relationship between lightning mechanisms, and of incorporating the influence of geographical location, latitude and storm type. Sweden, Malaysia and USA were chosen as the main locations for field experiments in 2009 to 2011 to gather a significant number of negative and positive CG flashes. This work provided data on a total of 1792 CG lightning flashes (1685 negative and 107 positive on

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21

Molinié, Gilles. "Le rôle de la précipitation dans les échanges électriques entre le nuage d'orage et le sol." Toulouse 3, 1998. http://www.theses.fr/1998TOU30258.

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Le rôle de la précipitation dans les échanges électriques entre le nuage d'orage et le sol, est étudié pour des transferts de charge dus aux éclairs nuage-sol (cg) (1) et a la pluie (2 et 3). 1- cg et précipitation : les distributions spatiales des précipitations et des impacts des cg montrent que ces derniers sont plutôt a l'avant des cellules orageuses si elles se déplacent à une vitesse supérieure à environ 10 m s##1. Ceci pourrait être en partie du a la dynamique du nuage. La relation quantitative entre la précipitation et les cg, est étudiée à l'échelle journalière pour laquelle la quanti

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22

Chen, Ting-Hung, and 陳定紅. "Strategic Change of Philips in Lighting Segment." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/fqp286.

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碩士<br>國立臺灣師範大學<br>高階經理人企業管理碩士在職專班(EMBA)<br>105<br>Executive Summary Taiwan Philips was established in 1966 at the Kaohsiung Export Processing Zone. It produces computer memory disk. Through 51 years of industrial upgrading and transformation, it has become one of the most enviable of foreign investors in Taiwan, as well as one of the important stronghold of Philips in the Asia region. The main objective of the consulting project is to improve the LED (light emitting diode, Light Emitting Diode) lighting market share and its visibility of Philips in Taiwan through the project management appro

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Martins, Paula Sofia Fernandes. "Cultura organizacional em contexto de mudança." Master's thesis, 2012. http://hdl.handle.net/10071/4658.

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O presente projeto tem como finalidade a elaboração de um caso pedagógico no âmbito do sector da iluminação. O intuito deste caso é focar a importância da consonância entre a Cultura organizacional vigente e as características do mercado, para a prosperidade e o próprio desempenho económico das organizações. Este caso permitirá ainda aos alunos das áreas de Gestão e de Gestão de Recursos Humanos, conhecer o Modelo dos Valores Contrastantes e o Instrumento de Análise da Cultura Organizacional de Robert Quinn, bem como a sua utilidade na gestão da mudança cultural. Iremos basear-nos no c

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Hu, Richard Zhi Ling. "Vision-Based Observation Models for Lower Limb 3D Tracking with a Moving Platform." Thesis, 2011. http://hdl.handle.net/10012/6110.

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Tracking and understanding human gait is an important step towards improving elderly mobility and safety. This thesis presents a vision-based tracking system that estimates the 3D pose of a wheeled walker user's lower limbs with cameras mounted on the moving walker. The tracker estimates 3D poses from images of the lower limbs in the coronal plane in a dynamic, uncontrolled environment. It employs a probabilistic approach based on particle filtering with three different camera setups: a monocular RGB camera, binocular RGB cameras, and a depth camera. For the RGB cameras, observation likeli

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Lawhead, Jonathan James. "Lightning in a Bottle." Thesis, 2014. https://doi.org/10.7916/D8348HW7.

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Climatology is a paradigmatic complex systems science. Understanding the global climate involves tackling problems in physics, chemistry, economics, and many other disciplines. I argue that complex systems like the global climate are characterized by certain dynamical features that explain how those systems change over time. A complex system's dynamics are shaped by the interaction of many different components operating at many different temporal and spatial scales. Examining the multidisciplinary and holistic methods of climatology can help us better understand the nature of complex syste

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Wu, Min-Sheng, and 吳民聖. "Charge and discharge control of high-performance solar lighting system." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/s2m5nb.

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碩士<br>國立臺灣大學<br>機械工程學研究所<br>93<br>A battery charge and discharge control technique for solar lighting system was developed to prevent the battery from being over charged in the daytime and to adjust the discharge power for lighting in order to extend the lighting time at night-time. A linear system dynamics model for battery discharge was first derived in the present study. It is found that a first-order perturbed model can accurately describe the system dynamic behavior of the battery at different operating conditions. A feedback control system utilizing PI control is designed. The closed-loo

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Tasman, Jesse Dean, and Jesse Dean Tasman. "Inference of charge transfer from lightning flashes in South Africa." Thesis, 2019. https://hdl.handle.net/10539/29157.

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A dissertation submitted in fulfillment of the requirements to the Faculty of Science, University of the Witwatersrand, Johannesburg, for the degree of Master of Science in the School of Electrical and Information Engineering, June 2019<br>The objective of this study is to determine the quantity of charge transferred, in Coulombs, during the continuing current phase of natural cloud-to-ground (CG) lightning flashes over an area in Johannesburg, South Africa. Continuing current is responsible for most thermal related lightning damages such as destruction of property, electrical fires and ph

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Yandulska, Kateryna. "Connection between Severe Weather and Intense Lightning." Thesis, 2009. http://hdl.handle.net/1807/19005.

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This Thesis researches, explains and provides conclusions for the question of correlation between data and criteria used by Environment Canada (EC) and Lightning Studies Research Group (LSG) of University of Toronto. The necessity of such correlation arises from the question of common criteria between severe weather, as it shown in graphical data from EC, and intense lighting storms, recorded by LSG, despite deep differences in area, time scale and object of observation used by those two organizations. The objective of the Thesis is not only to compare those two, very different sets of data a

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29

Seggewiß, Britta Janina. "Lightening the Dark of Employee Commitment: Refined Investigations into Debated Commitment Associations." Doctoral thesis, 2017. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2017110616327.

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The present research investigates three current debates in commitment research. In order to contribute to these debates and to provide novel insights, the present research consistently applies a differentiated multi-target approach by distinguishing between employees’ commitments to the organization and their commitments to its constituents top management, supervisors, and workgroups. In addition, it considers recent developments in the conceptual refinement of commitment and consistently aims to strongly build on established basic theoretical foundations of social psychology as well as on inc

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Lange, Jarren Hilton. "Practical considerations when inferring lightning current from electric field recordings with a high noise-floor." Thesis, 2015. http://hdl.handle.net/10539/22695.

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A dissertation submitted to the Faculty of Engineering and the Built Environment, University of the Witwatersrand, in ful lment of the requirements for the degree of Master of Science in Engineering. Johannesburg, 2015<br>During a cloud to ground lightning event a charge centre within the storm cloud is discharged. The discharge of a charge centre within the cloud leads to a change in the electric eld radiated by the charge centre. It is theoretically possible to infer the lightning current from the derivative of the electric eld. It is only possible to infer the lightning current fr

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Liphoto, Neo Paul. "The effect of a cross-cultural instructional approach on learnersâ conceptions of lightning and attitudes towards science." Thesis, 2008. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_3456_1262832622.

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<p><font face="Times New Roman"> <p align="left">This study looks at the effect of a cross-cultural instructional approach on the learners&rsquo<br>conceptions of lightning and attitude towards science. It explored Basotho conceptions of lightning and thunder under the following themes: nature of lightning, protection against lightning, animalistic/humanistic behaviour of lighting and nature of wounds inflicted by lightning.</p> </font></p>

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Lin, En-Chieh, and 林恩頡. "Analysis the protective effects of blue-light cutting spectacle lens against LED lighting induced visual physiological changes in the mouse model." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/mn9fbk.

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Liphoto, Neo Paul. "The effect of a cross-cultural instructional approach on learners' conceptions of lightning and attitudes towards science /." 2008. http://etd.uwc.ac.za/usrfiles/modules/etd/docs/etd_gen8Srv25Nme4_6811_1262832577.pdf.

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Kleine, Paul. "Material design for OLED lighting applications: Towards a shared computational and photophysical revelation of thermally activated delayed fluorescence." 2019. https://tud.qucosa.de/id/qucosa%3A36486.

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As the third generation of luminescent materials, thermally activated delayed fluorescence (TADF)-type compounds have great potential as emitter molecules in OLEDs allowing for electro-fluorescence with 100 % internal quantum efficiency. For organic electronics, the general wide range of applications from OLEDs, bio-fluorescence imaging to sensor technologies and photonic energy storages roots on the enormous variety of organic materials. Especially in the field of metal- free aromatic designs, the range of possible materials showing diverse triplet harvesting effects is immense, making mater

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