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 16 of 16 for “"distribution of light"”.
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Light Shapes Spaces: Experience of Distribution of Light and Visual Spatial Boundaries
Light enables us to experience space. The distribution of light is vital for spatial experience but has not been the main focus of previous research on lighting. The lighting designer’s professional knowledge is to a great extent experience-based and tacit. With design practice as the point of …
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Design and Analysis of Refractive Optical Systems for Irradiance Redistribution of Collimated Radiation.
Lens systems that modify the irradiance distribution of a collimated beam of radiation are useful primarily in applications involving laser beams. Since a laser is a source of high intensity, coherent, monochromatic light, a number of diverse applications for lasers have been suggested. However, …
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High Dynamic Range and Omnifocus Imaging
… and Gaussian thick-lens). Our investigation of the standard models shows that the models make two implicit assumptions: first, that the aperture is coincident with the first principal plane, and second, that a point light source uniformly illuminates the aperture. Both of these conflict with …
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Enhancing the soft proofing paradigm
The first part of this study is devoted to assessing the suitability of soft proofs as a surrogate for the final print in judging colour-reproduction quality. Two sets of psychophysical experiments were carried out. The first investigated whether the type of medium used to generate a stimulus …
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Shaping light-matter interactions for free-electron radiation and photonic computing
… enabling, among other things, the design of novel light sources, detectors, and devices controlling the polarization, spectral, and angular distribution of light. A landmark of nanophotonics is the design of nanostructured materials (metasurfaces, photonic crystals, single resonators, …
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Preliminary investigation of light scattering and visibility in two eastern national parks
Light scattering, ambient temperature, dew point temperature and altitude were measured in the Great Smoky Mountain National Park and Shenandoah National Park, two mandatory Federal class I prevention of significant deterioration (PSD) areas. Instruments for measuring these parameters and other air …
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Engineering functionalized gold nanoparticles as a molecular-specific contrast agent to enhance optoacoustic detection of breast cancer cells
Molecular targeting of malignant tumors is a promising field of research that could potentially revolutionize the diagnosis and treatment of many types of cancer including breast. Delivering molecular specific contrast agents to breast cancer cells would enhance the sensitivity and specificity of …
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Developing and optimising a raytracing lighting engine for interactive rendering applications
… games over the years have become more capable of rendering visually realistic images at higher frame rates. This is in large part to hardware companies designing GPUs with raytracing as a leading feature, bringing the technology to consumer levels of availability. One of the technologies that …
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Decoherence, Master Equation for Open Quantum Systems, and the Subordination Theory
This thesis addresses the problem of a form of anomalous decoherence that sheds light into the spectroscopy of blinking quantum dots. The system studied is a two-state system, interacting with an external environment that has the effect of establishing an interaction between the two states, via a …
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The Influence of Overstory Structure on Understory Light Availability in a Longleaf Pine (Pinus palustris Mill.) Forest
Understory light environments are inherently heterogeneous and therefore difficult to characterize. Numerous methods to measure understory light have been assessed in closed-canopied forests; however, the reliability of these methods has not been addressed for open-canopied forests. Therefore, the …
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Design and testing of a novel neutron survey meter
This thesis reports on the development of an instrument which can estimate the effective dose of a neutron field, accounting for both direction and energy of the field. This work represents a novel, real-time, approach to workplace directional neutron dosimetry. A 6Li-loaded scintillator based …
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Factors Influencing the Spatial and Temporal Distrubtion of Primary Productivity and Community Respiration in the Mississippi Coastal Estuarine Region
<p>This study describes the spatial and temporal distribution of net primary productivity (NetPP) and respiration (RESP) in relation to the biogeochemical, optical, and hydrographic variability in the Mississippi Sound and Mississippi Bight over the course of one year. Surface in-situ measurements …
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In Vivo Dosimetry Using Plastic Scintillation Detectors For External Beam Radiation Therapy
… vivo</em> dosimetry, the direct measurement of dose delivered to patients during radiation therapy, has significant potential in ensuring safe and effective treatment in radiation therapy. It can serve as point-of-delivery, patient specific quality assurance and direct verification of …
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Protein Analysis at the Single Cell Level by Nonlinear Laser Wave-Mixing Spectroscopy for High Throughput Capillary Electrophoresis Applications
… Applications. (Under the direction of William G. Tong and Morteza G. Khaledi) Nonlinear degenerate four-wave mixing is presented as an ultrasensitive optical absorption-based method for detection and measurement of biological samples. Wave-mixing imaging detection technique can …
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The non-invasive quantification of cutaneous haemoglobin and its oxygenation by reflectance spectrophotometry
… work detailed in this study describes the design of a rapid scanning multiwavelength reflectance spectrophotometer and its application to the measurement of cutaneous pigments. In this instrument the radiation from a 6V, 20 W quartz halogen lamp is transmitted to the reflectance probe by fibre …
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Ecological effects of turbidity variations in and around dredging areas in the Port of Tauranga
Turbidity is the scattering of light in water bodies and is an important measurement for assessing water quality in coastal systems. Suspended particles in the water column can greatly impact on light penetration and measured turbidity levels. These suspended particles can originate from a range of …