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 33 for “"transmission properties"”.
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Noise and signal transmission properties as agents of selection in the vibrational communication environment
… respond to noise, and whether variation in plant transmission properties can promote divergent selection on vibrational mating signals. When presented with vibrational noise derived from wind males and females reduce their signaling behavior. However, individuals use strategies such as gap …
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On the transmission properties of synapses made between granule cells and cerebellar Purkinje cells
In the cerebellar cortex, forms of both long-term depression (LTD) and long-term potentiation (LTP) can be observed at parallel fibre (PF) - Purkinje cell (PC) synapses. A presynaptic variant of cerebellar LTP can be evoked in PCs by raised frequency stimulation (RFS) of parallel fibre at 4-16Hz …
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Light Transmission Properties of Lentil (Lens culinaris Medik.) Seed Coat and Effect of Light Exposure on Cotyledon Quality
… were to investigate the variation in optical properties among lentil 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 …
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Effects of statistical variations on propagation of electromagnetic waves in disordered periodic structures
… parameters and lumped-element values on the transmission properties of transmission-line based metamaterial structures. The theory yields closed-form expressions for the calculation of the propagation constant of the disordered structure that are shown to provide an accurate alternative to …
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Extreme optomechanically induced 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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Decentralised velocity feedback control for thin homogeneous and lightweight sandwich panels
… weight ratio but also exhibit undesirable sound transmission properties which could cause problems with vehicle interior noise. The aim of this work is to assess the performance of decentralised velocity feedback control on lightweight sandwich panels.<br/>The first part of this thesis presents …
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Development of Novel Hearing Aid Technologies
… aid product have been identified. The sound transmission properties of multi-vented samples have been tested in a custom 2cc coupler. The effects of vent number, size and length as well as sample material have been investigated. Additional small scale real ear testing has been performed to …
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Analysis and Applications of Microstructure and Holey Optical Fibers
… for random index distributions, the average transmission properties are calculated and the influence of glass/air ratio on these properties is assessed. Important transmission properties of the fundamental mode, including normalized propagation constant, chromatic dispersion, field …
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A machine for tribological experimentation on indexing continuous media with specific application to semiconductor testing
… edge constraint was designed. The torque transmission properties of clamped connections were alloyed to the favorable kinematics of typical pinned type connections by compliantly mounting a spherical roller bearing as a pinch roller.
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A Generalized Analysis of Multiple-Clad Fibers with Arbitrary Step-Indx Profiles and Applications
… limiting cases. Using the generalized solutions, transmission properties of several types of specialty fibers for broadband applications, including dispersion-shifted, dispersion-flattened, and dispersion compensating fibers, are studied. Improved designs for dispersion-shifted and dispersion …
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Modeling and Analysis of Photonic Crystal Waveguides
… with infinite periodic cladding, and investigate transmission properties of a novel type of fiber, referred to as Fresnel fiber. A simple, fast, and efficient one-dimensional model is proposed. It is shown that the model is capable of predicting the normalized propagation constant, group-velocity …
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Deposition of electronic and plasmonic materials inside microstructured optical fibres
… of optical fibres and the signal processing properties of semiconductors devices. Only recently, with the advent of microstructured optical fibres and templating material processing methods, it has been possible to create optical fibres with solid-state material inclusions. An experimental …
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Determing the Properties of Dense Matter: Superconductivity, Bulk Viscosity, and Light Reflection in Compact Stars
In this dissertation, we investigate the properties of matter, denser than nuclei, that exists inside compact stars. First, we examine a mixed superfluid/superconductor system, which likely occurs in neutron star cores. We derive an effective theory of Cooper pair quasiparticles from a microscopic …
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Device for selecting lightwave ranges via computer control for studying building material properties via goniophotometer
… to profile the complete reflection and transmission properties for sample building materials. The resulting data is used in computer simulations and material optimization. The goniophotometer uses two types of detection cameras, color and infrared, to measure the light that is …
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Transmission and reflection properties of layered left-handed materials
This thesis is concerned with the reflection and transmission properties of layered left-handed materials (LHM). In particular, the reflection properties of (LHM) slabs are studied for the Goos-Hanchen (GH) lateral shift phenomenon. We demonstrate a unique GH lateral shift phenomenon, which shows …
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Stochastic modeling in computational electromagnetics
… random changes in the geometric and material properties occurring throughout the structure under consideration. Among the proposed methodologies, a technique is developed for the stochastic electromagnetic macromodeling of two-dimensional subdomains exhibiting geometric and material …
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Synthesis and characterization of metal-polyaniline thin films and membranes
… by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) to investigate the microstructures of specimens. Auger electron spectroscopy (AES) and X- ray photoelectron spectroscopy (XPS) were employed to study the chemical bonding and interactions between deposited …
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Behavioural and physiological responses of myzus persicae to ultraviolet light for the development of new pest control technologies
… polyethylene horticultural films with novel transmission properties, I exploited new opportunities for exploring separate short- and long-wavelength mechanisms for pest suppression. The early experimental work of the project tested the effect of short- and long-wavelength ultraviolet light on …
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The thermal performance of fixed and variable selective transmitters in commercial architecture
… reflectorized types; (b) glazings with selective transmission properties of the fixed variety which largely reflect the invisible portion of the solar spectrum and contain only heat and which establish a range of operating cost bases; and (c) newly proposed electro-chromic glazing materials which …
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A laboratory and performance evaluation of clothing assemblies which incorporate sliver-knit fabrics.
… cold environment are reviewed and outlined. The properties of fibres and fabrics as they relate to thermal insulation within a clothing assembly are considered and moisture vapour retention and transmission within the assembly and the relationship to clothing insulation are discussed in detail. …
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