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 13 of 13 for “"angular spread"”.
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Measured and Modeled Time and Angle Dispersion Characteristics of the 1.8 GHz Peer-to-Peer Radio Channel
… loss, mean delay, root-mean-square (RMS) delay spread, and timing jitter of the peer-to-peer wideband channel. Small-scale fading characteristics are measured in detail by measuring and analyzing 160 PDPs within each local area. This thesis shows the measurement setup for the calculation of …
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biaxial alignment in sputter deposited thin films
… degree of in-plane alignment is limited by the angular spread on the incoming material flux. Simulating the transport of the sputtered particles through the gas phase, results in the knowledge of this angular spread. Hence, the influence of several deposition parameters on the degree of in-plane …
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Design and evaluation of distributed spacecraft missions for multi-angular Earth observation
… dimensions. This thesis identifies a gap in the angular sampling abilities of monolithic spacecraft in Earth observation missions and proposes to use distributed spacecraft to address this gap. The science performance metric is chosen to be Bidirectional Reflectance-Distribution Function (BRDF), …
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Spin-orbit coupled Bose-Einstein condensates with observation of a stripe phase
… reflected beam and a camera setup to resolve the angular spread of the beam. An angle resolved, coherent Bragg beam is direct evidence of the stripe phase density modulation in free space. The formation of a free space density modulation in a superfluid Bose-Einstein condensate breaks the …
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Propagation and scattering of beam waves in vegetation using scalar transport theory
… vegetation, the range dependence, the effects of angular spread (beam broadening), and pulse broadening are determined. Pulse broadening is important especially in digital communications, where it may cause intersymbol interference and--depending on the data rate--a significant increase in bit …
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Improving Millimetre Wave Coverage in Indoor Environments using Convex Passive Reflectors
… between increased reflected power and reduced angular spread is considered, as well as a balance between achieving additional ray paths and the cost of deployment. Following the analytical investigation, experimental measurements have been conducted at Ka band to validate the findings using …
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Dynamics of Ocean Waves in a Continuous Sea Ice Cover
… the ice edge but the degree of inhomogeneity and angular spread decreases with distance. The existence of a critical angle of incidence enhances this effect considerably. Experiments carried out using strain measuring instruments on fast ice in Newfoundland are discussed and the data obtained are …
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Wireless Communication in Vehicles
… channel is instead characterised as a Doppler spread. This approach provides parameters which are sufficient to perform an information theoretic analysis to lower bound the capacity of the in-vehicle channel. For typical operating conditions, it is found that the channel capacity is …
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Two-state systems with non-Markovian thermal and squeezed quantum noise inputs
… three-dimensional squeezed field of modest angular spread. We show that this can be achieved, in principle, inside a microscopic plane mirror cavity, provided the injected squeezed field is suitably mode-matched to the cavity.
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Strength-structure relationships in carbon fibers
… this temperature it is proposed that a uniform angular spread of stacking size exists within the azimuthal spread of the (0O&) reflection. Heat treatment, particularly at 2500°C, causes the preferential growth of those crystallites aligned closest to the fibre axis, while the röle of smaller …
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Impacts of short-time scale water column variability on broadband high-frequency acoustic wave propagation
… acoustic ray path, acoustic beam intensity and angular spread are a function of vertical isotherm oscillations on a time scale of minutes and can be modeled accurately by a 2-D PE model. Third, a forward problem is introduced which uses acoustic wavefronts received on a vertical line array, 1.48 …
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A High-Resolution Time-of-Flight Spectrometer for Fission Fragments and Ion Beams
… resolution improves due to the minimised SE angular spread. Such a mode of operation was favoured until the mirror “semi-transparency” regime was reached, after which increasing further the accelerating potential could lead to a position resolution worsen- ing. An explanation of the fact …