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 65 for “"scatters"”.
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Pushing the Limits: Testing, Magnetometry and Ontario Lithic Scatters
Lithic scatters, small ephemeral clusters of stone artifacts on cultivated surfaces, lie on the periphery of archaeology. These sites are often too ephemeral to be fully understood through standardized fieldwork methodologies mandated in Ontario CRM archaeology and yet, they are widely regarded as …
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Surface lithic scatters as an archaeological resource in South and Central Scotland
… centuries. The disparate knowledge concerning scatters in Scotland led to the creation of the Scottish Lithic Scatters Project, which is outlined in chapter one. Of specific concern is the Lithic Scatters Database, and its analysis. Descriptions of each field give an intriguing insight into the …
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Boundary integral equation based numerical solutions of helmholtz transmission problems for composite scatters
In this dissertation, an in-depth comparison between boundary integral equation solvers and Domain Decomposition Methods (DDM) for frequency domain Helmholtz transmission problems in composite two-dimensional media is presented. Composite media are characterized by piece-wise constant material …
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Experiments to Measure the Effects of Timber Harvesting Equipment on Surface Lithic Scatters
… on the effects of timber harvesting on lithic scatters on Modoc National Forest. The experiments involved placement of 225 glass tiles (proxy lithics) in each of three plots subject to vehicle traffic and log dragging by steel-tracked and rubber-wheeled equipment. After the harvest, there was …
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Analytical approximations of surface fields induced on convex scatters by exteriorly incident scalar fields
The boundary value problems for the Helmholtz equation give rise to boundary integral equations for the unknown surface field or its normal derivative. These integral equations involve the Helmholtz surface potentials in the form of weakly singular surface integrals. This thesis is based on a …
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Lithic scatters and landscape: the Mesolithic, Neolithic and Early Bronze Age inhabitation of the lower Exe valley, Devon
… the evidence of a series of surface lithic scatters. Research draws on recent confident approaches to surface lithic scatters which view them as key data for understanding the inhabitation of prehistoric landscapes. Theoretically it draws on the dwelling perspective and proposes that both …
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Stone tools and sand veld settlement
… included rock art locations, stone artefact scatters, deposit-containing shelters and shell middens. Considerable variation was found to exist in assemblage composition and site density within an area stretching between the coast and the fringes of the Cape Fold Belt mountains. A number of …
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Baffle material characterization for Advanced LIGO
… for the LIGO interferometers. When light scatters away from the main laser beam, then scatters off the beam tube and returns to the main beam, noise is introduced into the phase of the laser. The Auxiliary Optics Support subsystem uses baffles and beam dumps to control this scatter, but …
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Measurements of dynamics in an orientationally anisotropic system
… azimuthal range, while an isotropic domain scatters uniformly to all azimuthal angles, separate but simultaneous , measurements of dynamics in coexisting isotropic and orientationally ordered domains were possible. The observed correlation functions indicated that the flow-aligned, …
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Electromagnetic scattering from a structured slab comprised of periodically placed resistive cards
… to characterize how an electromagnetic wave scatters from this slab. The structured slabs discussed in this thesis are constructed by repeating lossy strips periodically in one dimension or lossy plates in two dimensions.
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Geoarchaeology in semi-arid landscapes
… source of water. Abundant lithic surface scatters provide evidence of human presence in the landscape. These lithic scatters are often found near quartzite outcrops and on the pan surfaces. The results presented in the three scientific articles contribute to a growing body of …
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On The Origin of Super-Hot Electrons in Intense Laser-Plasma Interactions
… by the Bethe-Heitler process where an electron scatters and emits bremsstrahlung radiation which then interacts with an atomic nucleus and creates an electron-positron pair. The positron bunch is a useful diagnostic for understanding the laser-plasma interaction. Modeling results are also …
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A study of real-time lighting effects.
… more complex because each particle absorbs and scatters light. This problem has been approximated with many techniques but can take hours to produce a single image. Creating these images in realtime is an even harder problem because they need to be produced many times a second. Real-time …
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Characterization of a two-color magneto-optical trap for a spin-squeezed optical lattice clock
… trap (MOT) for ytterbium that simultaneously scatters light from two atomic transitions, in order to reduce the minimum magnetic field gradient required for trapping atoms. From the experimental data, we propose a model of the MOT where one transition is responsible for trapping the atoms the …
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A novel capillary polymerase chain reaction machine
… until it strikes the drop, at which point it scatters. The scatter is picked up by a series of photodiodes to provide position feedback. Due to the efficient heat transfer arrangement, the drop can transition between different temperature steps in -2 seconds, which includes both drop motion …
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Raman scattering by a molecule adsorbed at the surface of a thin metallic film
… by the incident photon; the excited electron scatters off the molecule inelastically, exciting a molecular vibration; the electron finally recombines with the hole emitting the Raman scattered photon. This is one of the mechanisms proposed by Burstein and co-workers (1). The electrons in the …
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Orientation dependence of the acoustic backscatter for elongated zooplankton
… the monotonic relationship exhibited when sound scatters off of an impenetrable flat plate. Reasonable agreement is found between the theoretically predicted beamwidths and most experimental data, where the beamwidth was more-or-less oscillatory about a mean value of 19°. The structure can at …
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Curing Characteristics of Photopolymer Resin With Dispersed Glass Microspheres in Vat Polymerization 3D Printing
… its curing characteristics because the filler scatters and absorbs light, which modifies the curing reaction. However, the ability to cure photopolymer resin with high filler volume fraction is important to 3D print material specimens for specific engineering applications, e.g. structural …
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The Organization of Technology in the Pine Hills of Mississippi
… presence of numerous sites consisting of flake scatters and little other material remains. Local tool stone resources consist of high grade chert in the form of small river cobbles, which restricts potential tool forms available to users.</p> <p>Research for this project focused on the …
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A hard kind of labor: an archaeological analysis of small-scale hard rock mines in northeast Washington
… simple mining technology, and sparse artifact scatters. However, the site has some unusual qualities, namely the log and milled lumber construction chosen for its structures, making them appear made for long-term occupation despite artifactual evidence pointing to short-term use of the site. …
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