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 17 of 17 for “"Light Extinction"”.
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A Diagnostic Technique for Particle Characterization Using Laser Light Extinction
… by aircraft in brownout conditions using light extinction with the end goal of producing an onboard aircraft diagnostic sensor. By measuring the extinct light intensity in presence of particles over range of concentrations, a relationship between diameters, concentration and light …
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Investigation of Clean Diesel Combustion With Oxygenated Fuels in a Constant -Volume Combustion Chamber Using Forward Illumination Light Extinction Technique
The mechanism of soot reduction from oxygenated fuels was explored. DBM and TPME oxygenated fuels with 7% oxygen by weight were studied and have shown different soot reduction performances at different diesel combustion modes. In the premixed combustion mode, the higher oxygen efficiency from TPME …
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High resolution scattering measurements for stationary particles
… concentration of spherical particles by using light extinction. However, when one moves to increasingly complex shapes one must take into consideration not only light extinction but multi angle light scattering. Cylindrical particles scatter light in a way that can be quantified by …
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Phytoplankton productivity of tropical Lake Chapala, Mexico.
… productivity at the depth of optimum light intensity averaged 320 mg C m"^ day"'*', and always occured within the top 70 cm of the water column. Light extinction due to' inorganic turbidity was the principal limiting factor of areal phytoplankton productivity. Nutrient limitation was …
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Optical Properties of Substrate Supported Mixtures of Silver and Gold Nanoparticles
… opportunity for greater manipulation of light within one simple system. The spectral information obtained from individual depositions of NPs provided information on the light extinction exhibited by the nanomaterials. For AgNCs and AuNPs on polystyrene (PS) dipolar resonances at 439 nm …
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Traverse injection of a particle-laden liquid jet into a supersonic air stream
… and behavior of the jets were examined through a light extinction survey and through a series of streak arid nanoflash photographs. Some of the particles were found to agglomerate into clumps ranging up to 40 microns in diameter. The clumps separated from the liquid plume and penetrated up to 45% …
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Comprehensive throughflow method for steam turbine development
… computed droplet size spectra (converted to light extinction) agree remarkably well with light extinction measurements, suggesting that the developed model can be used as a predictive tool for turbine design.
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The Effect of Aerosols on Radiative Transfer and the Optical Properties of the Atmosphere
… To investigate the effect of aerosols on light extinction in the visible wavelengths, we used field measurements of aerosol concentrations, the elastic light scattering and interactive efficiency (ELSIE) model and an open-air integrating nephelometer. The annual-mean species concentrations …
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Optical properties of light absorbing organic carbon aerosol and its mixtures at high sub-saturated humidities
… the balance between absorption and scattering of light by the particles, which are affected by ambient relative humidity (RH). Although absorption and scattering have been measured under dry conditions, their measurement at high RH requires laboratory measurements with a high degree of control. …
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A productivity study on Smith Mountain Lake
… algae, bacteria, specific conductance, light and primary productivity. The effect of each of these parameters on the trophic levels in the reservoirs was studied. The results of this investigation showed that the inflow of the nutrient rich Roanoke River had caused eutrophic conditions …
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Development of a three wavelength short path extinction cell (SPEC) for in-situ determination of aerosols optical properties
U of I Only Restriction set for Item 117729 on 2021-05-25T16:23:22Z with date by madinag@illinois.edu.
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How Does Vegetation Movement During Laser Scanning Affect Common Point Cloud-Derived Metrics? A Virtual Laser Scanning Study
… Meanwhile, standard height metrics and indirect light-extinction based leaf area estimates are fairly robust to leaf flutter. Modelled leaf movement also does not affect the metrics derived from simulated UAV-borne laser scanning point clouds. Leaf area estimation from TLS point clouds using …
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Ecological Effects of Overwater Structures on Subtidal Kelp, Northern Puget Sound, Washington
… kelp collected from 30 samples at each site. Light extinction coefficients were calculated using an array of 11 PAR sensors deployed at various depths and distances from each dock and within each paired control site. Substrate samples were analyzed for organic content and particle size …
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In Situ Characterization of Optical Absorption by Carbonaceous Aerosols: Calibration and Measurement
Light absorption by aerosols has a great impact on climate change. A Photoacoustic spectrometer (PA) coupled with aerosol-based classification techniques represents an in situ method that can quantify the light absorption by aerosols in a real time, yet significant differences have been reported …
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Electrical, Optical and acoustic diagnostics of atmospheric pressure gas discharges
… optical signal according to the Mie theory for light extinction at a metal nanoparticle interface. The functionalisation using long chain polethyleneglycol has also been demonstrated to provide a protein repellent surface for non-specic protein binding reduction.
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Evaluation and improvement of optical remote sensing methods in monitoring particulate matter emissions and plume opacity
… plume opacity, which is defined as percentage of light that is attenuated by a plume. This research focuses on two optical methods that have been developed and implemented previously to measure PM mass emission factor (EF) and plume opacity. My contributions to this research are: 1) evaluating and …
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A tripartite study on Bayesian estimation of photosynthetically active radiation, impacts of future climate, and adaptation strategies on crop production: a spatial model framework for the Eastern Kansas River Basin
… for radiation use efficiency [RUE], light extinction [KCAN], and heat tolerance [HEAT]), and agronomic management (shifting planting window [PD1 & PD2], and non-limiting nutrient allocation [NNL]) on yield and irrigation water use were assessed. Results showed that incorporating …