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 162 for “"fade"”.
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The last colour to fade
… and collective history, The Last Colour to Fade offers a meditation on the sea as both a physical and psychological landscape. Memories of my childhood spent on Robben Island are interwoven with historical facts, with narratives borrowed from literature and film, and images from art and …
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Integration of rain fade into OPNET
… covers the study done to integrate rain fade into OPNET by including in one of the propagation models, the ability to access channel information from an external file and using the data to calculate attenuation along the simulated radio path.First the operation of OPNET is summarised, and …
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Study of fade and inter-fade durations in Ku- and Ka- band frequencies using OLYMPUS satellite beacons
Fade and inter-fade duration data obtained from the three beacons at 12, 20, and 30 GHz aboard the OLYMPUS satellite were analyzed. The different types of signal impairments and their causes were highlighted and a literature survey conducted. Twelve months of fade and inter-fade data were analyzed …
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Exploration into the head start fade phenomenon
<p>The Head Start fade effect, documented since the 1970s, finds that students who make gains in I.Q. and social skills in the Head Start program later see those positive effects diminish in the early years of schooling and disappear altogether by the end of third grade. The hypothesis proposed in …
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Fade durations in satellite-path mobile radio propagation
Fades on satellite to land mobile radio links are caused by several factors, the most important of which are multipath propagation and vegetative shadowing. Designers of vehicular satellite communications systems require information about the statistics of fade durations in order to overcome or …
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The effects of post inoculant additions on ductile iron fade
1 PDF file (47 pages)
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Adaptive power control as a fade countermeasure on satellite links
… very susceptible to outages due to rain-induced fades. In order to reduce the impact of these fades, it has been proposed that the power of the uplink station transmitter be adjusted during the fade to compensate. This dissertation will explore some of the issues involved in implementing this …
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Capacity Fade Analysis and Model Based Optimization of Lithium-ion Batteries
… stress-induced material damage, capacity fade, and the potential for thermal runaway. This dissertation contributes to the efforts in the modeling, simulation and optimization of lithium-ion batteries and their use in the design of better batteries for the future. While physics-based …
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Viability of High Availability Kband Satellite Communication using Hybrid Fade Mitigation
… The use of higher frequencies led to fade mitigation design considerations that had not previously been necessary, as fixed power margins had been sufficient to guarantee high availability.<br/><br/>This thesis reviews the majority of fade mitigation techniques that are available and …
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Diagnostic and prognostic methodology for monitoring silk fade in a museum environment
… structures. To achieve this, a new mathematical fade model is postulated, to predict the fading, (colour degradation) of the silk that is a function of the exposure to its environmental conditions, such as, temperature, light levels, and relative humidity. This is the first time such a model has …
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Free-space optical networks : fade and interference mitigation and network congestion control
… a given outage probability. Although signal fades or 'outages' in an FSO link can be mitigated on the Physical Layer, they cannot be completely eliminated. In a free-space optical network, these outages affect the performance and design of the Transport Layer. The effect of outages on the TCP …
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A hybrid battery cell voltage equalizer considering thermal behavior and capacity fade characteristics
The thesis focuses on developing a robust, high-fidelity lithium-ion battery model adaptive to changes in operating temperature, aiming for accurate estimation of state of health (SOH). The thesis proposes two novel methods for lithium-ion battery SOH tracking and estimation using the developed …
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Satellite Channel State Prediction based on Fade Slope and Artificial Intelligence (AI) Algorithms
… can be mitigated by providing sufficient fixed fade margin.<br/><br/>Therefore, there is a need for adaptive fade mitigation techniques (AFMTs), to compensate for the strong tropospheric impairments, caused in the Ka/Q/V frequency bands. For these techniques to work, adequate channel prediction …
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Modelling of Rainfall Drop Size Distributions for Application in Fade Prediction on Earth-Space Paths
… link dimensioning to include a sufficient fixed fade margin. Adaptive fade mitigation will, therefore, be essential to ensure a reliable and robust downlink. The required knowledge of the instantaneous rain attenuation on the downlink could be gained by using ground-based measurement of rain rate …
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Development of a heterogeneous microwave network, fade simulation tool applicable to networks that span Europe
… recognized models to predict annual fade distributions for a wide variety of individual radio link. However, these models are not sufficient for the design and optimisation of networks, even as simple as two links. There are considerable potential gains to be achieved from the …
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Fade slope measurements and modeling in the Ku- and Ka-bands using the Olympus satellite
… June through August 1992. This thesis presents fade slope statistics that were generated from the one year data that were obtained during the Olympus experiment. A background on fade slope is presented and includes a theoretically derived expression for fade slope, a comparison of fade slope …
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Fade Statistics For A Lasercom System And The Joint Pdf Of A Gamma-gamma Distributed Irradiance And Its Time Derivative
… signal. The result is a randomly fading signal. Fade statistics for lasercom systems are determined from the probability density function (PDF) of the irradiance fluctuations. The expected number of fades per second and their mean fade time require the joint PDF of the fluctuating irradiance and …
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