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 55 for “"light transmission"”.
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NIR light transmission through skin and muscle
Light has been used extensively in the medical field for both therapeutic and diagnostic applications. Tissue optical window or therapeutic window defines the range of wavelengths where the light has the maximum transmittance through tissue. In this range, absorption and scattering effects are …
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Modelling external light transmission through to the human fetus
… the human uterus is illuminated by external light sources. Beyond aiding with experimental research in fetal vision, an understanding of uterine illumination begins to reveal the impact of varying environmental conditions on the fetal visual experience, with direct relevance to ongoing …
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Exploring light transmission through ice-snow cover and water in lakes
… cores, we assessed the internal variability of light transmittance, evaluating the impact of non-homogeneities, such as bubbles, within the ice. This intrinsic variability, along with the variability that can be in the field due to meteorological conditions, results in a wide range of values for …
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Non-reciprocal light transmission in integrated photonic systems via acousto-optic interaction
… can be modulated by a traveling wave so that light propagating in opposite directions experience non-reciprocal frequency and momentum shifts. These ""momentum biased system'' do not require special magneto-optic materials and can be produced with common dielectrics that are already present in …
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Brillouin scattering induced transparency: Coherent optomechanical interaction leading to slow light and non-reciprocal light transmission
… isolator is a device that allows only one-way light transmission. It is an essential optical component used for protection of laser sources found in many applications such as undersea optical communication networks, spectroscopy, fluorescence microscopy, and laser cutting. Today, all optical …
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Light Transmission Properties of Lentil (Lens culinaris Medik.) Seed Coat and Effect of Light Exposure on Cotyledon Quality
… seed coat types and to determine the effect of light treatment, seed coat presence, and seed coat type on color loss in lentil cotyledon. Light transmission properties of seed coat types were obtained to find out if they differ in their light-blocking ability and protection of the underlying …
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Vertical Distributions of Zooplankton at the Mouth of Chesapeake Bay and Calibration of Backscatter From an Acoustic Doppler Current Profiler
… 1999. Temperature, salinity, fluorescence, light transmission, current velocity and backscatter were measured throughout the sampling period. Plankton samples were collected every hour from 3.5, 7.5, and 11.5 m.</p> <p>We found little association between ADCP backscatter and plankton …
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The effect of repetitive firing cycles on physical and optical properties of zirconia reinforced lithium silicate ceramics
… firing cycles’ effects on the translucency, light’s absorption coefficient, and flexural strength of zirconia-reinforced lithium silicate ceramics. Two zirconia-reinforced lithium silicate ceramics and one lithium disilicate glass-ceramic were tested. Blocks of all materials were sectioned …
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Extreme optomechanically induced transparency
… transparency effects. This system modifies the light transmission properties of the optical cavity reducing the transmission by a factor of 3 x 10 -3 at the highest power levels. A linewidth reduction of 5 x 10 -5, from 10 kHz to 20 mHz, has been achieved.
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Light and Heat Selective Polymer Nanocomposite Films for Sustainable Greenhouses
… associated with this service, as well as limited light intensity during winter months, is a significant problem. For this reason quantum dot (QD) nanoparticles and silica aerogel (SA) granules were investigated as potential filler materials for the enhancement of the optical and thermal properties …
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Nonlinear aluminum nitride photonic crystal measurement using tapered fiber
… in the conversion between infrared and visible light. A ring resonator with a top layer of aluminum nitride, a material with high second order susceptibility, can achieve an efficient coupling between 780 nm visible light and 1550 nm infrared light. A tapered region is also integrated to improve …
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Integrated optical phased arrays for three-dimensional display applications
… integrated optical phased arrays (OPAs) for light detection and ranging (LiDAR) and free-space communications. However, silicon is limited to operating at infrared wavelengths since its bandgap prevents visible light transmission. The development of integrated OPAs for arbitrary complex …
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Impact of Prescribed Fire on the Terrestrial Orchid, <i>Isotria medeoloides</i> in Virginia's Blue Ridge Mountains
… alpha diversity and forest floor cover and light transmission. A population differential was calculated by subtracting the burned population stem count from that of the unburned. Results showed that the population differential increased by 17% in spring 2024 (two months after fire) but in …
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Pulsed laser ablation deposition and optical characterization of hexagonal-wurtzite silicon
… microscopy and optically characterized by white light transmission.
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Next generation CAT system
… techniques for future CAT system are presented. Transmission descattering is a singleshot method to differentiate unscattered and scattered components of light transmission through a scattering material. Directly-transmitted components travel in a straight line from the light source, while …
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Testing and modeling of photo-electric modulators
… to perform these measurements. The optical transmission spectra of the set of modulators studied had extinction ratios in the range of 5 to 27 dB, which is sufficient for modulation. I developed analytical and T-Matrix models to extract physical parameters from the transmission scans, such …
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Limnology of Three Farm Ponds in South-Central South Dakota
… ponds were about 2 to 4C lower than the surface. Light transmission was influenced by turbidity but generally penetrated to the bottom of the ponds except during periods of cloudy ice and snow cover. Dissolved oxygen was near saturation during periods of open water. Most chemical ions in the ponds …
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Crack Healing in Polymers (Fracture, Reptation, Tack)
… from dark-field optical microscopy and light transmission measurements. For the healing of bulk polymer surfaces, molecular-level models were coupled with experiments to investigate the effects of healing time t, temperature T, and molecular weight M. The reptation theory of …
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Limnology of Selected South Dakota Lakes
… formation was observed in six of the lakes. Light transmission was influenced by turbidity, and varied greatly within individual lakes and among lakes. Dissolved oxygen concentrations ranged from near saturation to less than the recommended minimum for fish life. All likes studied were basic …
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Characterizing Water as Gap Fill for Double Glazing Units
<p>The use of sunlight has always been a major goal in the design and operation of commercial buildings to minimize electrical consumption of artificial lighting systems. Glazing systems designed to allow optimal visible light transmission also allow significant unwanted direct solar heat gain …
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