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 43 for “"transmitted light"”.
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Transmitted light intensity as a nondestructive evaluation technique for glass/epoxy composite laminates
… more cost-effective and practical, are needed. Transmitted light intensity has the potential to satisfy these criteria. By measuring light intensity transmitted through a composite sample during fatigue testing, changes in the intensity were correlated to damage development within the sample. By …
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Modernized Approach For Generating Micro-Layering And Macro-Heterogeneous Structures In Porous Media For Use In Transmitted-Light Method Flow Visualization Experiments
… sand-filled experimental chambers or cells for light-transmitted flow visualization experiments. This method creates reproducible, reverse graded, layered (stratified) thin-slab sand chambers for visualizing multiphase flow through porous media. Reverse-graded stratification of sand chambers …
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In vitro feasibility testing of floating light-activated minroelectrical stimulators
… as potential contact materials, and measure the transmitted light power through the neural tissue for various implantation depths. The charge injection capacity of TiN electrodes for an extended range of cathodic voltages was also investigated. Because the microstimulator will be implanted into …
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Some quantitative observations on the parathyroid glands of man
… by the recognition of their opacity to transmitted light. The location of these glands before or at operation is being attempted by the use of radio -isotopes. On the principle that all radiation is harmful, it is suggested that the possibility of employing transillumination be …
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A pertographic and geochemical study of selected peridotitic and pyroxenitic xenoliths from the three kimberlite localities in the Lac de Gras region, Northwest Territories, Canada
… A petrographic study of the xenoliths using both transmitted light microscopy and binocular microscopy was followed by major anti trace element analysis. Major element compositions of individual minerals were determined using a wavelength dispersive electron microprobe, and trace element …
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Development of a reinforcing fibre light-guide for use as a damage sensor within composite structures
… by using glass reinforcing fibres to produce a light-guide, which was embedded within a composite laminate. The laminate was then subjected to impact events or bending stresses of sufficient magnitude to cause damage. The impact energies used in this study varied between 2 and 10 Joules, and the …
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Imaging nanoscale pollen morphology with Superresolution Structured Illumination Microscopy
… that are smaller than the diffraction limit of light are often limited to electron microscopy, which presents significant disadvantages in routine palynological work compared to optical microscopy. Superresolution Structured Illumination Microscopy (SR-SIM) is an emerging method that presents a …
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Sensitivity control of optical fiber biosensors utilizing turnaround point long period gratings with self-assembled polymer coatings
… TAP LPG, we have demonstrated that shifts in the transmitted light intensity at the resonant wavelength of the LPG can result from the variation in film thickness and/or refractive index. We have observed decreases in intensity as large a 7 dB for one bilayer of ISAM film (~1 nm), which …
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New methods for measuring spectral bi-directional transmission and reflection using digital cameras
… in buildings. Distribution of visible light and near infrared radiation can be optimized to enhance daylighting and reduce thermal loads. Light redirecting window systems are one of many innovative fenestration systems available for improving the daylighting and thermal performance of …
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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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Characterization of dispersive and distributive mixing in a co-rotating twin-screw compounding extruder
… calcium carbonate filler using reflected light microscopy on polished surfaces, and transmitted light microscopy of microtomed pigmented sections. Stereological statistics have been applied to raw sample data; results are discussed in relation to mechanistic phenomena influencing particle …
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Novel design for foot pressure measurement using opto-electronics in rehabilitation
… the refractive angle and the path length of the transmitted light, thereby varying the intensity of light reaching the detector. The change in intensity of light detected will be proportional to the change in voltage and the recorded voltage is observed in a voltmeter or an oscilloscope. Static …
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Design, analysis, and fabrication of a prototype non-invasive system for assessment of biological and synthetic tissues
… This new system incorporates an efficient light delivery system, as well as a novel light collection system to provide high repeatability, reproducibility, sensitivity, and detection thresholds. The system incorporates simultaneous measurement of transmitted light, forward scattered light, …
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Transillumination techniques in ophthalmic imaging
… in a reflection geometry. Images are formed from light that has backscattered off corneal microstructures or backreflected from the retina. In this configuration, artifacts caused by superficial surface reflections are often encountered. These unwanted reflections can either globally overwhelm the …
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Development of a photobioreactor for the cultivation of the freshwater microalga Haematococcus pluvialis
… each photobioreactor acted as the main area for light absorbance, (analysis of the spectral absorbance of the tubing revealed that it transmitted light of 320 - 820nm). The AAPS™I and AAPS™2 had a manifold photo stage, comprising of three windings. They also had a riser and downcomer of increased …
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Tunable Linear and Nonlinear Metasurfaces Based on Hybrid Gold-Graphene Plasmons
… and are very thin compared to the wavelength of light. Despite their thinness, these structured materials can strongly interact with incident light to effect the functionalities of conventional optical components, such as rotation of the polarization state, beam steering, lensing, spectral …
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Femtosecond laser writing in transparent materials
… laser direct writing. Broadening of the transmitted light source by as much as 500 nm was demonstrated through a waveguide with a length of 1.8 cm. Finally, passive waveguide components such as Y-splitters and directional couplers have also been fabricated using this writing …
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A comparative microscopic study of human and non-human long bone histology.
… by using image analysis, and viewed under a transmitted light microscope. The microstructural measurements showed significant differences between human and nonhuman samples. The discriminant functions showed correct classification rates for 81.4% of cases, and the accuracy of identification …
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The chemical characterisation of authigenic carbonates from the Witbank no. 2 coal seam : environmental and diagenetic implications
… analysis, vitrinite reflectance, reflected and transmitted light microscopy, scanning electron microscopy and electron microprobe analysis. Comparison with the studies of Matsumoto and Iijima (1981), Curtis and Coleman (1986) and other literature showed the Witbank carbonates to have followed a …
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STUDY OF COLLOIDAL INTERACTIONS MEDIATED BY BIOMOLECULAR RECOGNITION AND BY ELECTROKINETIC FLOWS.
… by optical techniques: static and dynamic light scattering, electric transmitted light intensity and electric birefringence. The first part of the thesis reports a systematic study of colloidal interactions performed on a dispersion of charged spherical latex particles having two peculiar …
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