Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"light distribution"”.
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A study of the variation of light distribution due to the change of position of the filament
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1923.
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Light manipulation with photonic fibers and optical light guides : dynamic structural color and light distribution in microalgae cultures
… photonic fibers represent versatile systems for light manipulation. They are used to guide, reflect, emit, and absorb light, and can be designed to alter the light's spectral composition in any of these light-matter interactions. Additional functionality arises from the combination of these …
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The geometry of external shading devices as related to natural ventilation, daylighting and thermal comfort, with particular reference to tropical hot-humid climates
… of the geometry of external shading devices upon light distribution, air flow pattern and thermal comfort, with direct application to the tropical hot-humid climates. A series of 30 different configurations of shading devices were evaluated under four different testing conditions, including …
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Moments of perfection : a study of natural lighting in the Church of Santo Spirito
Reliance on natural lighting in the Renaissance is put into context through the exploration of religious light symbolism and the explanation of the dependence on the solar path to measure the passage of time. Through systematic observation of the light distribution through out the year "moments of …
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Anwendung der Monte-Carlo-Methoden zur Lösung spezieller Probleme des Photonentransports
… calculations were made for simulation of light distribution in tissues, for 3D estimation of dosis brachytherapy source, for determination of scattering coincidences in PET and for solving of one special problem for ambient dosimetry. The developed calculation methods are based on a purely …
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Utilization of water and light resources by annual crops under semi-arid conditions when planted between Leucaena leucocephala (Lam.) de Wit hedgerows
… to pure stands, and to investigate the use and distribution of, and competition for, water and light in these systems. Although alley-cropped annuals seldom outperformed pure stand annual crops, the diversification of yield, enabled by combining trees and crops, compensated for lower yields of …
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Development of a light detection system for bidirectional measurements over the solar spectrum and sun course simulations with scale models
The use of natural light in building structures can increase energy efficiency and lead to more sustainable architecture. To encourage such use of natural light, a dual experimental device is being developed at MIT to help evaluate the effectiveness of various daylighting approaches, to be used as …
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Deep Photoacoustic Imaging and Acoustic Cavitation Mapping in Shockwave Lithotripsy
… fiber diffuser was applied to achieve uniform light distribution and extend the imaging depth to ~10 cm. Moreover, a sliding-window passive cavitation mapping approach was developed and validated to provide accurate temporal and spatial information about cavitation bubble collapses. Finally, we …
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Ligth shelt: estudo da sua eficiência lumínica através de simulação computacional
… very unfavorable related to its utilization as light sources for inner spaces. One of these caracteristics, is the enormous diference between ilumination levels near the apertures and deeper in the room illuminated by that aperture, i.e., the poor natural light distribution in a longitudinal …
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Two -Photon Standing Wave Fluorescence Photobleaching With Application to the Study of Chromatin Motion
… microscope objectives, resulting in a periodic light distribution in a volume on the order of a femtoliter and spatial resolution on the order of 100 nm. This two-photon counterpropagating fluorescence recovery after patterned photobleaching (2P-c-FRAPP) method is applied to the study of …
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Photodynamic Therapy utilizing Interstitial Light Delivery Combined with Spectroscopic Methods
… at developing equipment and methods that use light for both detection and treatment of various malignant or pre-malignant conditions. Fundamental knowledge on the interaction between light and tissue is required in order to develop models for the light distribution in tissue. Therefore, basic …
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STRUCTURAL INFLUENCES ON INTENSITY INTERFEROMETRY CORRELATION
… interference phenomenon between amplitudes of light, rather their intensities. Brighter sources and larger telescopes allow for greater amounts of light to be collected, but do not specifically involve the intensity interference of electromagnetic fields. There is an alternate form of creating …
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Photocatalysis in a novel semiconducting optical fiber monolithic reactor for wastewater treatment
… inside the monolithic channels as both a light-transmitting conductor and a support for TiO2, was developed for wastewater treatment by investigating the photocatalytic degradation of o-dichlorobenzene (DCB) and phenanthrene (PHE). This configuration provides a high surface area for …
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The maximum quantum efficiency of CO2 assimilation declines with depth in the canopies of the C4 crops Miscanthus x giganteus and Zea mays
… productivity. φ is thought to increase at low light in the C4 crop Miscanthus x giganteus (M. x giganteus) (Kromdijk et al., 2008). This should reduce photosynthetic light use efficiency (PLUE) in the lower canopy. Zea mays (Z. mays), a close relative, may share this problem. Measurements were …
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Kinetics of Brownian Transport
… assist in finding holograms for a given desired light distribution. I compare several differentmodels, including conditional generative-adversarial networks and conditional variational autoencoders, which are trained on data sets sampled on the HOT setup. Furthermore, I propose a novel …
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Analyzing variation in plant canopy conversion efficiency and assessing canopy and leaf photosynthetic efficiency in soybean with reduced chlorophyll content
… chl content was hypothesized to improve canopy light distribution compared to the wildtype (WT) by creating a more even balance of light availability between leaf layers. Gas exchange measurements at the leaf level demonstrated greater light use efficiency in chl-deficient mutants when chl …
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Beyond Suspension: Light and Growth Dynamics in Immobilised Algal Cultures
… clusters, the collective environment and spatial distribution of algal aggregates within a gel matrix were also investigated. By microscopic investigation of the algal aggregates confined in the gels, a spatial gradient of their sizes depending on the distance from the gel-air interface was …
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Antimicrobial Photodynamic Therapy in Clinical Dentistry: Unravelling the Mechanisms and Exploring Hidden Benefits
… in view of the non-invasive nature of light, ease of application, and notably, the lack of potential resistance. Furthermore, the interactions and suppression of microorganisms upon exposure to reactive oxygen species (ROS) are key benefits of this therapy. The mechanisms of action of …
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Development of Steady-State and Dynamic Flux Models for Broad-Scope Microbial Metabolism Analysis
… provides a rigorous way of examining cell flux distributions in the central metabolism. FBA, on the other hand, gives a holistic review of optimal fluxomes on the genome scale. In this dissertation, flux analysis techniques were constructed to investigate the microbial metabolisms.</p> <p>First, …
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Distributed, adaptive deployment for nonholonomic mobile sensor networks : theory and experiments
… Pioneer 3-AT robots sensing a piecewise constant light distribution function. The experimental results are satisfactory since the robots carry out the coverage task. However, the accuracy of the estimation is affected by the approximation of the adaptation law by difference equations, the number …
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